CN117003498A

CN117003498A - Island cement and preparation process and application thereof

Info

Publication number: CN117003498A
Application number: CN202310856658.1A
Authority: CN
Inventors: 余红发; 范浩田; 王南; 麻海燕; 陈晓青; 高宇宁; 李玲玉
Original assignee: Nanjing University of Aeronautics and Astronautics
Current assignee: Nanjing University of Aeronautics and Astronautics
Priority date: 2023-07-13
Filing date: 2023-07-13
Publication date: 2023-11-07

Abstract

The invention discloses island cement and a preparation process and application thereof, and belongs to the technical field of cement, wherein the island cement comprises the following components in parts by weight: portland cement clinker: 30-80 parts; active mineral admixture: 15-65; gypsum: 2.5 to 6; the active mineral admixture comprises granulated blast furnace slag, fly ash and coral powder with amino alcohol adsorbed on the surface, wherein the mass ratio is 5-55:5-35:5-40; or the active mineral admixture comprises granulated blast furnace slag and coral powder with amino alcohol adsorbed on the surface, and the mass ratio is 5-55:5-40; or the active mineral admixture comprises fly ash and coral powder with amino alcohol adsorbed on the surface, and the mass ratio is 5-35:5-40. The product of the invention has the remarkable characteristics of fresh water and seawater mixing and maintenance, has higher early strength, stable later strength and excellent seawater erosion resistance, and simultaneously has better compactness and volume stability.

Description

Island cement and preparation process and application thereof

Technical Field

The invention belongs to the technical field of cement, relates to island cement, and in particular relates to island cement and a preparation method and application thereof.

Background

In recent years, development of ocean resources is getting more and more important, and the development of offshore engineering construction such as port, pond, coast protection and airport on ocean island reefs is particularly rapid, so there is an increasing demand for cementing materials for maritime work. However, the transportation of concrete materials, particularly cementing materials, to ocean island reefs is very time-consuming, labor-consuming and expensive, and if the materials can be obtained locally in the island reefs, the transportation cost of the cement materials can be greatly reduced; therefore, research on how to improve the raw material properties of island cement materials without reducing the concrete performance is getting more and more important.

Ocean islands, in particular cement concrete structures used in tidal zones, splash zones, are subjected to erosion by sea water for a long time. However, the seawater erosion resistance and seawater scouring resistance of the common cement cannot completely meet the special requirements of ocean engineering. The island cement widely used at present takes silicate cement as a base material, and is singly doped with active mixed materials comprising fly ash and blast furnace slag to prepare seawater erosion resistant cement, such as GB/T31289-2014 sea engineering silicate cement. However, the cement has the defect of corrosion resistance caused by the slow early hydration speed, can only adopt fresh water mixing and curing, can not use seawater mixing and curing and the like, and can not solve the rust risk of steel bars in marine concrete, so that island cement with higher early strength and better durability is expected in the market.

Disclosure of Invention

Aiming at the problems of lower transportation efficiency, high cost, slower formation strength, steel bar corrosion and the like of the prior ocean island cement-based material, the invention provides the cement which is suitable for partially taking local materials, can mix and maintain fresh water and seawater and has low cost and high durability,

in order to achieve the above object, the present invention provides an island cement having the following characteristics: the island cement comprises the following components in parts by weight: portland cement clinker: 30-80 parts; active mineral admixture: 15-65; gypsum: 2.5 to 6; the active mineral admixture comprises granulated blast furnace slag, fly ash and coral powder with amino alcohol adsorbed on the surface, wherein the mass ratio of the granulated blast furnace slag to the fly ash to the coral powder with amino alcohol adsorbed on the surface is 5-55:5-35:5-40; or the active mineral admixture comprises granulated blast furnace slag and coral powder with amino alcohol adsorbed on the surface, wherein the mass ratio of the granulated blast furnace slag to the coral powder with amino alcohol adsorbed on the surface is 5-55:5-40; or the active mineral admixture comprises fly ash and coral powder with the surface adsorbed with amino alcohol, and the mass ratio of the fly ash to the coral powder with the surface adsorbed with amino alcohol is 5-35:5-40.

Further, the present invention provides an island cement, which may further have the following characteristics: the coral powder with the amino alcohol adsorbed on the surface is obtained by grinding coral reef sand and an amino alcohol grinding aid in a mixed mode.

Further, the present invention provides an island cement, which may further have the following characteristics: wherein the amino alcohol grinding aid is triethylalcohol amine, dimethyl alcohol amine or a mixture of triethylalcohol amine and dimethyl alcohol amine according to the mass ratio of 1-5:1-5.

Further, the present invention provides an island cement, which may further have the following characteristics: wherein the mass ratio of the coral reef sand to the amino alcohol grinding aid is 5-40:0.5-2.

Further, the present invention provides an island cement, which may further have the following characteristics: wherein the Portland cement clinker comprises tricalcium silicate (C ₃ S), dicalcium silicate (beta-C ₂ S), tricalcium aluminate (C) ₃ A) And tetracalcium aluminoferrite (C) ₄ AF); the mass ratio of tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite is 36-70:15-37:7-15:10-18.

Further, the present invention provides an island cement, which may further have the following characteristics: wherein the granulated blast furnace slag has a grade of S95 and above.

Further, the present invention provides an island cement, which may further have the following characteristics: the grade of the fly ash is II grade or above.

Further, the present invention provides an island cement, which may further have the following characteristics: wherein the specific surface area of the granulated blast furnace slag, the fly ash and the coral powder with the surface adsorbed with the amino alcohol after being ground is not less than 350m ² /kg; preferably, the specific surface area of the granulated blast furnace slag, the fly ash and the coral powder with the surface adsorbed with the amino alcohol is not less than 400m after being ground ² /kg。

The invention also provides a preparation process of the island cement, which is characterized in that: the method comprises the following steps: firstly, grinding the broken coral reef sand and an amino alcohol grinding aid in a mixed mode, so that the surface of coral powder adsorbs amino alcohol, and grinding the coral reef sand until the specific surface area of the coral powder with the surface adsorbed with the amino alcohol is not less than 300m ² /kg; crushing granulated blast furnace slag and/or fly ash, and grinding to specific surface area not smaller than 300m ² /kg; step two, the silicate cement clinker, gypsum and the finely ground active mineral admixture in the step one are mixed according to weightAdding the components into a mixing mill, and uniformly mixing and grinding for the second time until the specific surface area is not less than 310m ² And (3) kg, preparing an island cement finished product.

The invention also provides an application method of the island cement, which is characterized in that: when the island reef cement and the sand stone or the coral reef sand are used for preparing mortar or concrete, fresh water is adopted for mixing and curing, or seawater is adopted for mixing and curing; mortar or concrete which is mixed and maintained by fresh water is used for reinforced concrete structures such as buildings, bridges and the like; mortar or concrete obtained by mixing and curing seawater is used for plain concrete structures such as breakwaters, roads, breakwater blocks and the like on ocean islands.

The invention has the beneficial effects that:

1. the raw materials of coral micropowder required by the product can directly obtain coral reef sand from the island reef to be built; in addition, the strong durability design proves that island local sea water mixing can be used through experiments; the raw material is greatly improved in localization, so that the transportation quantity of the ocean island reef cementing material is greatly reduced, the cost of island reef sea engineering construction is reduced, the convenience and economic benefit are obvious, and the requirements of ocean engineering construction are met.

2. The product of the invention is fast-hardening and early-strength, and the later strength is continuously increased, which is beneficial to improving the safety and durability of reinforced concrete in use.

3. The cement mortar or concrete prepared by the product can effectively retard the corrosion of the reinforcing steel bars for a long time, and has the characteristics of being capable of adopting fresh water for mixing and curing and adopting seawater for mixing and curing.

4. The cement concrete structure prepared by the product has good compactness and volume stability; can improve the impermeability of concrete, has high resistance to diffusion of chloride ions, sulfate erosion, seawater corrosion and steel bar rust resistance, and meets the requirements of ocean engineering construction.

5. According to the invention, amino alcohol is used as the coral micropowder grinding aid, so that the function of reinforcing steel bar rust resistance can be continuously exerted in island cement after the grinding aid function of the coral reef sand grinding stage is realized, and the corrosion prevention of reinforcing steel bars in concrete is realized.

Drawings

FIG. 1 is a flow chart of a process for preparing island cement according to the present invention;

FIG. 2 is a graph showing the particle size distribution of ground granulated blast furnace slag, fly ash, and coral powder surface-adsorbed amino alcohol in the island cement of the present invention;

FIG. 3 is a scanning electron microscope image of coral powder in the island cement of the present invention;

FIG. 4 is an analysis of hydration products of different embodiments of the reef cements (coral powder having different amounts of amino alcohol adsorbed on the surface) of the present invention, wherein a is the reef cement 28d paste hydration product of embodiment 26, b is the reef cement 28d paste hydration product of embodiment 27, c is the reef cement 28d paste hydration product of embodiment 30, and d is the reef cement 28d paste hydration product of embodiment 35;

FIG. 5 is a scanning electron microscope image of the island cement of the various embodiments of the present invention (containing different amounts of active mineral admixture) at different ages, wherein a is the scanning electron microscope image of the island cement of the embodiment 28, and b is the scanning electron microscope image of the island cement of the embodiment 31;

FIG. 6 is a graph showing the results of the test of the corrosion current density of the steel bars of the island cement formulated concrete according to the various examples and comparative examples of the present invention in 365 days of the seawater exposure test (concrete mix: 800kg per cubic meter of island cement, 224kg per cubic meter of island cement, 860kg per fine aggregate, 369kg per coarse aggregate), wherein a is the graph showing the results of the test of the corrosion current density of the steel bars of the island cement formulated concrete according to example 1 and comparative examples 1 to 3, and b is the graph showing the results of the test of the corrosion current density of the steel bars of the island cement formulated concrete according to example 33 and comparative example 33.

Detailed Description

The invention is further illustrated below with reference to specific examples.

Example 1

The embodiment provides island cement which comprises the following components in parts by weight: 32 parts of silicate cement clinker, 3 parts of anhydrite, 25 parts of granulated blast furnace slag, 35 parts of fly ash, 5 parts of coral powder with amino alcohol adsorbed on the surface (4.5 parts of coral powder and 0.5 part of amino alcohol grinding aid are mixed and ground to prepare the amino alcohol grinding aid A mixture of triethylalcohol amine and dimethyl alcohol amine in a mass ratio of 1:1). The preparation process comprises the following steps: crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 400m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 400m ² /kg; adding the silicate cement clinker, the anhydrite and the granulated blast furnace slag ground in the first step, the fly ash and the coral powder with the amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 340m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Comparative examples 1-1 (coral powder free with amino alcohol Admixture)

The comparative example provides island cement which comprises the following components in parts by weight: 37 parts of silicate cement clinker (same as in example 1), 3 parts of anhydrite, 25 parts of granulated blast furnace slag, 34.5 parts of fly ash and 0.5 part of amino alcohol additive (same as in example 1). The preparation process comprises the following steps: firstly, crushing granulated blast furnace slag and fly ash in advance, and respectively grinding until the specific surface area is more than or equal to 400m ² /kg; adding the silicate cement clinker, the anhydrite and the granulated blast furnace slag ground in the step one, the fly ash and the amino alcohol additive into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 340m ² And (3) kg, preparing an island cement finished product. Wherein the added amino alcohol additive is used as a rust inhibitor. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Comparative examples 1-2 (coral powder and amino alcohol admixture, but amino alcohol admixture was not used as grinding aid but was used as rust inhibitor in advance)

The comparative example provides island cement which comprises the following components in parts by weight: 32 parts of Portland cement clinker (same as in example 1), 3 parts of anhydrite, 25 parts of granulated blast furnace slag, 35 parts of fly ash, 4.5 parts of coral powder, and an amino alcohol-based admixture (same as in example 1)Base alcohol grinding aid) 0.5 parts. The preparation process comprises the following steps: firstly, crushing coral reef sand, granulated blast furnace slag and fly ash in advance, and respectively grinding until the specific surface area is more than or equal to 400m ² /kg; adding the silicate cement clinker, the anhydrite, the amino alcohol grinding aid (serving as a rust inhibitor) and the granulated blast furnace slag, the fly ash and the coral powder which are ground in the step one into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 340m ² And (3) kg, preparing an island cement finished product. Wherein the added amino alcohol additive is used as a rust inhibitor. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Comparative examples 1-3 (coral powder, no amino alcohol grinding aid)

The comparative example provides island cement which comprises the following components in parts by weight: 32 parts of silicate cement clinker (same as in example 1), 3 parts of anhydrite, 25 parts of granulated blast furnace slag, 35 parts of fly ash and 4.5 parts of coral powder. The preparation process comprises the following steps: firstly, crushing coral reef sand, granulated blast furnace slag and fly ash in advance, and respectively grinding until the specific surface area is more than or equal to 400m ² /kg; adding the silicate cement clinker, the anhydrite, the granulated blast furnace slag ground in the first step, the fly ash and the coral powder into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 340m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 2

The embodiment provides island cement which comprises the following components in parts by weight: 45 parts of silicate cement clinker (same as in example 1), 5 parts of anhydrite, 5 parts of granulated blast furnace slag, 5 parts of fly ash and 40 parts of coral powder with amino alcohol adsorbed on the surface (38 parts of coral powder and 2 parts of amino alcohol grinding aid are mixed and ground, and the amino alcohol grinding aid is a mixture of triethylalcohol amine and dimethyl alcohol amine in a mass ratio of 5:1). The preparation process comprises the following steps: crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 430m ² Kg, at the same time, of granulatingThe blast furnace slag and the fly ash are firstly crushed and respectively ground into fine powder until the specific surface area is more than or equal to 430m ² /kg; adding the silicate cement clinker, the anhydrite and the granulated blast furnace slag ground in the first step, the fly ash and the coral powder with the amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 320m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 3

The embodiment provides island cement which comprises the following components in parts by weight: 32 parts of silicate cement clinker (same as in example 1), 3 parts of anhydrite, 55 parts of granulated blast furnace slag, 5 parts of fly ash and 5 parts of coral powder with amino alcohol adsorbed on the surface (4.5 parts of coral powder and 0.5 part of amino alcohol grinding aid are mixed and ground, and the amino alcohol grinding aid is a mixture of triethylalcohol amine and dimethyl alcohol amine in a mass ratio of 3:1). The preparation process comprises the following steps: crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 400m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 400m ² /kg; adding the silicate cement clinker, the anhydrite and the granulated blast furnace slag ground in the first step, the fly ash and the coral powder with the amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 400m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 4

The embodiment provides island cement which comprises the following components in parts by weight: 32 parts of silicate cement clinker (same as in example 1), 3 parts of anhydrite, 25 parts of granulated blast furnace slag, 35 parts of fly ash and 5 parts of coral powder with amino alcohol adsorbed on the surface (4.5 parts of coral powder and 0.5 part of amino alcohol grinding aid are mixed and ground, and the amino alcohol grinding aid is a mixture of triethylalcohol amine and dimethyl alcohol amine in a mass ratio of 2:1). The preparation process comprises the following steps: crushing coral reef sand, and mixing amino alcoholGrinding the grinding aid to a specific surface area of more than or equal to 385m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 450m ² Kg and 400m ² /kg; adding the silicate cement clinker, the anhydrite and the granulated blast furnace slag ground in the first step, the fly ash and the coral powder with the amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 380m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 5

The embodiment provides island cement which comprises the following components in parts by weight: 45 parts of silicate cement clinker (same as in example 1), 5 parts of anhydrite, 5 parts of granulated blast furnace slag, 5 parts of fly ash and 40 parts of coral powder with amino alcohol adsorbed on the surface (38 parts of coral powder and 2 parts of amino alcohol grinding aid are mixed and ground, and the amino alcohol grinding aid is triethylalcohol amine). The preparation process comprises the following steps: crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 390m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 420m ² Kg and 410m ² /kg; adding the silicate cement clinker, the anhydrite and the granulated blast furnace slag ground in the first step, the fly ash and the coral powder with the amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 350m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 6

The embodiment provides island cement which comprises the following components in parts by weight: 32 parts of silicate cement clinker (same as in example 1), 3 parts of anhydrite, 55 parts of granulated blast furnace slag, 5 parts of fly ash and 5 parts of coral powder with amino alcohol adsorbed on the surface (4.5 parts of coral powder and 0.5 part of amino alcohol grinding aid are mixed and ground to prepare the amino alcohol grinding aid which is dimethyl alcohol amine). The preparation process comprises the following steps: step one, crushing coral reef sandThe mixed amino alcohol grinding aid is primarily ground until the specific surface area is more than or equal to 325m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 410m ² Kg and 398m ² /kg; adding the silicate cement clinker, the anhydrite and the granulated blast furnace slag ground in the first step, the fly ash and the coral powder with the amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 410m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 7

The embodiment provides island cement which comprises the following components in parts by weight: 32 parts of silicate cement clinker (same as in example 1), 3 parts of anhydrite, 25 parts of granulated blast furnace slag, 35 parts of fly ash and 5 parts of coral powder. The preparation process comprises the following steps: step one, crushing coral reef sand, and primarily grinding until the specific surface area is more than or equal to 400m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 400m ² /kg; adding the silicate cement clinker, the anhydrite, the granulated blast furnace slag ground in the first step, the fly ash and the coral powder into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 395m ² And (3) kg, preparing an island cement finished product. The setting time of the seawater mixing and curing and the strength test result of the mortar test piece are shown in Table 1.

Example 8

The embodiment provides island cement which comprises the following components in parts by weight: 45 parts of silicate cement clinker (same as in example 1), 5 parts of anhydrite, 5 parts of granulated blast furnace slag, 5 parts of fly ash and 40 parts of coral powder. The preparation process comprises the following steps: step one, crushing coral reef sand, and primarily grinding until the specific surface area is more than or equal to 400m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 430m ² /kg; step two, adding the silicate cement clinker, the anhydrite, the granulated blast furnace slag ground in the step one, the fly ash and the coral powder into a mixing mill according to parts by weightSecondary mixing and grinding uniformly until the specific surface area is more than or equal to 410m ² And (3) kg, preparing an island cement finished product. The setting time of the seawater mixing and curing and the strength test result of the mortar test piece are shown in Table 1.

Example 9

The embodiment provides island cement which comprises the following components in parts by weight: 32 parts of silicate cement clinker (same as in example 1), 3 parts of anhydrite, 55 parts of granulated blast furnace slag, 5 parts of fly ash and 5 parts of coral powder. The preparation process comprises the following steps: step one, crushing coral reef sand, and primarily grinding until the specific surface area is more than or equal to 400m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 440m ² /kg; adding the silicate cement clinker, the anhydrite, the granulated blast furnace slag ground in the first step, the fly ash and the coral powder into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 45m ² And (3) kg, preparing an island cement finished product. The setting time of the seawater mixing and curing and the strength test result of the mortar test piece are shown in Table 1.

Example 10

The embodiment provides island cement which comprises the following components in parts by weight: 32 parts of silicate cement clinker (same as in example 1), 3 parts of anhydrite, 25 parts of granulated blast furnace slag, 35 parts of fly ash and 5 parts of coral powder. The preparation process comprises the following steps: step one, crushing coral reef sand, and primarily grinding until the specific surface area is more than or equal to 400m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 430m ² /kg; adding the silicate cement clinker, the anhydrite, the granulated blast furnace slag ground in the first step, the fly ash and the coral powder into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 310m ² And (3) kg, preparing an island cement finished product. The setting time of the seawater mixing and curing and the strength test result of the mortar test piece are shown in Table 1.

Example 11

The embodiment provides island cement which comprises the following components in parts by weight: portland cement clinker (same as in example 1) 45 parts, hard stone5 parts of paste, 5 parts of granulated blast furnace slag, 5 parts of fly ash and 40 parts of coral powder. The preparation process comprises the following steps: step one, crushing coral reef sand, and primarily grinding until the specific surface area is more than or equal to 400m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 470m ² Kg and 430m ² /kg; adding the silicate cement clinker, the anhydrite, the granulated blast furnace slag ground in the first step, the fly ash and the coral powder into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 434m ² And (3) kg, preparing an island cement finished product. The setting time of the seawater mixing and curing and the strength test result of the mortar test piece are shown in Table 1.

Example 12

The embodiment provides island cement which comprises the following components in parts by weight: 32 parts of silicate cement clinker (same as in example 1), 3 parts of anhydrite, 55 parts of granulated blast furnace slag, 5 parts of fly ash and 5 parts of coral powder. The preparation process comprises the following steps: step one, crushing coral reef sand, and primarily grinding until the specific surface area is more than or equal to 335m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 430m ² /kg; adding the silicate cement clinker, the anhydrite, the granulated blast furnace slag ground in the first step, the fly ash and the coral powder into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 360m ² And (3) kg, preparing an island cement finished product. The setting time of the seawater mixing and curing and the strength test result of the mortar test piece are shown in Table 1.

Example 13

The embodiment provides island cement which comprises the following components in parts by weight: 32 parts of silicate cement clinker (same as in example 1), 3 parts of anhydrite, 55 parts of granulated blast furnace slag, 5 parts of fly ash and 5 parts of coral powder with amino alcohol adsorbed on the surface (4.5 parts of coral powder and 0.5 part of amino alcohol grinding aid are mixed and ground to prepare the amino alcohol grinding aid, and the amino alcohol grinding aid is the same as in example 1). The preparation process comprises the following steps: crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 420m ² Kg, at the same time granulating blast furnace oreCrushing the slag and the fly ash in advance and grinding the slag and the fly ash into fine powder respectively until the specific surface area is more than or equal to 420m ² /kg; adding the silicate cement clinker, the anhydrite and the granulated blast furnace slag ground in the first step, the fly ash and the coral powder with the amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 365m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 14

The embodiment provides island cement which comprises the following components in parts by weight: 70 parts of silicate cement clinker (same as in example 1), 5 parts of anhydrite, 15 parts of granulated blast furnace slag, 5 parts of fly ash and 5 parts of coral powder with amino alcohol adsorbed on the surface (4.5 parts of coral powder and 0.5 part of amino alcohol grinding aid are mixed and ground to prepare the amino alcohol grinding aid, and the amino alcohol grinding aid is the same as in example 2). The preparation process comprises the following steps: crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 440m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 440m ² /kg; adding the silicate cement clinker, the anhydrite and the granulated blast furnace slag ground in the first step, the fly ash and the coral powder with the amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 420m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 15

The embodiment provides island cement which comprises the following components in parts by weight: 70 parts of silicate cement clinker (same as in example 1), 5 parts of anhydrite, 5 parts of granulated blast furnace slag, 5 parts of fly ash and 15 parts of coral powder with amino alcohol adsorbed on the surface (14 parts of coral powder and 1 part of amino alcohol grinding aid are mixed and ground to prepare the amino alcohol grinding aid, and the amino alcohol grinding aid is the same as in example 3). The preparation process comprises the following steps: crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 395m ² Kg, crushing granulated blast furnace slag and flyash and separatingGrinding to specific surface area greater than or equal to 395m ² /kg; adding the silicate cement clinker, the anhydrite and the granulated blast furnace slag ground in the first step, the fly ash and the coral powder with the amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 460m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 16

The embodiment provides island cement which comprises the following components in parts by weight: 47 parts of silicate cement clinker (same as in example 1), 8 parts of anhydrite, 10 parts of granulated blast furnace slag, 10 parts of fly ash and 25 parts of coral powder with amino alcohol adsorbed on the surface (23.5 parts of coral powder and 1.5 parts of amino alcohol grinding aid are mixed and ground to prepare the amino alcohol grinding aid, and the amino alcohol grinding aid is the same as in example 4). The preparation process comprises the following steps: crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 345m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 470m ² Kg and 430m ² /kg; adding the silicate cement clinker, the anhydrite and the granulated blast furnace slag ground in the first step, the fly ash and the coral powder with the amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 394m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 17

The embodiment provides island cement which comprises the following components in parts by weight: 70 parts of silicate cement clinker (same as in example 1), 5 parts of anhydrite, 15 parts of granulated blast furnace slag, 5 parts of fly ash and 5 parts of coral powder with amino alcohol adsorbed on the surface (4.5 parts of coral powder and 0.5 part of amino alcohol grinding aid are mixed and ground to prepare the amino alcohol grinding aid, and the amino alcohol grinding aid is the same as in example 5). The preparation process comprises the following steps: crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 335m ² Kg, crushing granulated blast furnace slag and flyash, and grinding separatelyFine to a specific surface area of not less than 350m ² Kg and 450m ² /kg; adding the silicate cement clinker, the anhydrite and the granulated blast furnace slag ground in the first step, the fly ash and the coral powder with the amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 433m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 18

The embodiment provides island cement which comprises the following components in parts by weight: 70 parts of silicate cement clinker (same as in example 1), 5 parts of anhydrite, 5 parts of granulated blast furnace slag, 5 parts of fly ash and 15 parts of coral powder with amino alcohol adsorbed on the surface (14 parts of coral powder and 1 part of amino alcohol grinding aid are mixed and ground to prepare the amino alcohol grinding aid, and the amino alcohol grinding aid is the same as in example 6). The preparation process comprises the following steps: crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 405m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 430m ² Kg and 365m ² /kg; adding the silicate cement clinker, the anhydrite and the granulated blast furnace slag ground in the first step, the fly ash and the coral powder with the amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 330m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 19

The embodiment provides island cement which comprises the following components in parts by weight: 47 parts of silicate cement clinker (same as in example 1), 8 parts of anhydrite, 10 parts of granulated blast furnace slag, 10 parts of fly ash and 25 parts of coral powder. The preparation process comprises the following steps: step one, crushing coral reef sand, and primarily grinding until the specific surface area is more than or equal to 405m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 430m ² Kg and 365m ² /kg; step two, grinding silicate cement clinker, anhydrite and step one into fine particlesAdding the chemical blast furnace slag, the fly ash and the coral powder into a mixing mill according to parts by weight, and carrying out secondary mixing milling until the specific surface area is more than or equal to 418m ² And (3) kg, preparing an island cement finished product. The setting time of the seawater mixing and curing and the strength test result of the mortar test piece are shown in Table 1.

Comparative example 19-1 (comparative coral powder-free)

The comparative example provides island cement which comprises the following components in parts by weight: 72 parts of silicate cement clinker (same as in example 1), 8 parts of anhydrite, 10 parts of granulated blast furnace slag and 10 parts of fly ash. The preparation process comprises the following steps: firstly, crushing granulated blast furnace slag and fly ash in advance, and respectively grinding until the specific surface area is more than or equal to 430m ² Kg and 365m ² /kg; adding the silicate cement clinker, the anhydrite and the granulated blast furnace slag and the fly ash which are ground in the first step into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 418m ² And (3) kg, preparing an island cement finished product. The setting time of the seawater mixing and curing and the strength test result of the mortar test piece are shown in Table 1.

Example 20

The embodiment provides island cement which comprises the following components in parts by weight: 70 parts of silicate cement clinker (same as in example 1), 5 parts of anhydrite, 15 parts of granulated blast furnace slag, 5 parts of fly ash and 5 parts of coral powder. The preparation process comprises the following steps: step one, crushing coral reef sand, and primarily grinding until the specific surface area is more than or equal to 430m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 430m ² Kg and 365m ² /kg; adding the silicate cement clinker, the anhydrite, the granulated blast furnace slag ground in the first step, the fly ash and the coral powder into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 420m ² And (3) kg, preparing an island cement finished product. The setting time of the seawater mixing and curing and the strength test result of the mortar test piece are shown in Table 1.

Example 21

The embodiment provides island cement which comprises the following components in parts by weight: silicic acid70 parts of cement clinker (same as in example 1), 5 parts of anhydrite, 5 parts of granulated blast furnace slag, 5 parts of fly ash and 15 parts of coral powder. The preparation process comprises the following steps: step one, crushing coral reef sand, and primarily grinding until the specific surface area is more than or equal to 390m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 390m ² /kg; adding the silicate cement clinker, the anhydrite, the granulated blast furnace slag ground in the first step, the fly ash and the coral powder into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 380m ² And (3) kg, preparing an island cement finished product. The setting time of the seawater mixing and curing and the strength test result of the mortar test piece are shown in Table 1.

Example 22

The embodiment provides island cement which comprises the following components in parts by weight: 47 parts of silicate cement clinker (same as in example 1), 8 parts of anhydrite, 10 parts of granulated blast furnace slag, 10 parts of fly ash and 25 parts of coral powder. The preparation process comprises the following steps: step one, crushing coral reef sand, and primarily grinding until the specific surface area is more than or equal to 405m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 405m ² Kg and 430m ² /kg; adding the silicate cement clinker, the anhydrite, the granulated blast furnace slag ground in the first step, the fly ash and the coral powder into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 390m ² And (3) kg, preparing an island cement finished product. The setting time of the seawater mixing and curing and the strength test result of the mortar test piece are shown in Table 1.

Example 23

The embodiment provides island cement which comprises the following components in parts by weight: 70 parts of silicate cement clinker (same as in example 1), 5 parts of anhydrite, 15 parts of granulated blast furnace slag, 5 parts of fly ash and 5 parts of coral powder. The preparation process comprises the following steps: step one, crushing coral reef sand, and primarily grinding until the specific surface area is more than or equal to 410m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 464m ² Kg and 374m ² /kg; step by stepAdding the silicate cement clinker, the anhydrite, the granulated blast furnace slag ground in the first step, the fly ash and the coral powder into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 378m ² And (3) kg, preparing an island cement finished product. The setting time of the seawater mixing and curing and the strength test result of the mortar test piece are shown in Table 1.

Example 24

The embodiment provides island cement which comprises the following components in parts by weight: 70 parts of silicate cement clinker (same as in example 1), 5 parts of anhydrite, 5 parts of granulated blast furnace slag, 5 parts of fly ash and 15 parts of coral powder. The preparation process comprises the following steps: step one, crushing coral reef sand, and primarily grinding until the specific surface area is more than or equal to 405m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 395m ² Kg and 420m ² /kg; adding the silicate cement clinker, the anhydrite, the granulated blast furnace slag ground in the first step, the fly ash and the coral powder into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 473m ² And (3) kg, preparing an island cement finished product. The setting time of the seawater mixing and curing and the strength test result of the mortar test piece are shown in Table 1.

Example 25

The embodiment provides island cement which comprises the following components in parts by weight: 47 parts of silicate cement clinker (same as in example 1), 3 parts of anhydrite, 45 parts of granulated blast furnace slag and 5 parts of coral powder with amino alcohol adsorbed on the surface (4.5 parts of coral powder and 0.5 part of amino alcohol grinding aid are mixed and ground to prepare the amino alcohol grinding aid, and the amino alcohol grinding aid is the same as in example 1). The preparation process comprises the following steps: crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 400m ² Per kg, and crushing and grinding the granulated blast furnace slag in advance until the specific surface area is more than or equal to 400m ² /kg; adding the silicate cement clinker, the anhydrite and the granulated blast furnace slag ground in the first step and coral powder with amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 340m ² Preparing island cement intoThe product is obtained. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 26

The embodiment provides island cement which comprises the following components in parts by weight: 72 parts of silicate cement clinker (same as in example 1), 8 parts of anhydrite, 10 parts of granulated blast furnace slag and 10 parts of coral powder with amino alcohol adsorbed on the surface (9 parts of coral powder and 1 part of amino alcohol grinding aid are mixed and ground to prepare the amino alcohol grinding aid, and the amino alcohol grinding aid is the same as in example 2). The preparation process comprises the following steps: crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 430m ² Per kg, and crushing and grinding the granulated blast furnace slag in advance until the specific surface area is more than or equal to 430m ² /kg; adding the silicate cement clinker, the anhydrite and the granulated blast furnace slag ground in the first step and coral powder with amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 320m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 27

The embodiment provides island cement which comprises the following components in parts by weight: 64 parts of silicate cement clinker (same as in example 1), 6 parts of anhydrite, 20 parts of granulated blast furnace slag and 10 parts of coral powder with amino alcohol adsorbed on the surface (9.5 parts of coral powder and 0.5 part of amino alcohol grinding aid are mixed and ground to prepare the amino alcohol grinding aid, and the amino alcohol grinding aid is the same as in example 3). The preparation process comprises the following steps:

crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 380m ² Per kg, and crushing and grinding the granulated blast furnace slag in advance until the specific surface area is more than or equal to 380m ² /kg; adding the silicate cement clinker, the anhydrite and the granulated blast furnace slag ground in the first step and coral powder with amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 400m ² And (3) kg, preparing an island cement finished product. The setting time of fresh water mixing and curing and the strength test result of the mortar test piece are shown in the table1。

Example 28

The embodiment provides island cement which comprises the following components in parts by weight: 55 parts of silicate cement clinker (same as in example 1), 5 parts of anhydrite, 30 parts of granulated blast furnace slag and 10 parts of coral powder with amino alcohol adsorbed on the surface (9.5 parts of coral powder and 0.5 part of amino alcohol grinding aid are mixed and ground to prepare the amino alcohol grinding aid, and the amino alcohol grinding aid is the same as in example 4). The preparation process comprises the following steps:

Crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 450m ² Per kg, and simultaneously crushing and grinding the granulated blast furnace slag till the specific surface area is more than or equal to 385m ² /kg; adding the silicate cement clinker, the anhydrite and the granulated blast furnace slag ground in the first step and coral powder with amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 380m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 29

The embodiment provides island cement which comprises the following components in parts by weight: 72 parts of silicate cement clinker (same as in example 1), 8 parts of anhydrite, 5 parts of granulated blast furnace slag, and 15 parts of coral powder with amino alcohol adsorbed on the surface (14 parts of coral powder and 1 part of amino alcohol grinding aid are mixed and ground to prepare the amino alcohol grinding aid, and the amino alcohol grinding aid is the same as in example 5). The preparation process comprises the following steps: crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 420m ² Per kg, and crushing and grinding the granulated blast furnace slag in advance until the specific surface area is more than or equal to 390m ² /kg; adding the silicate cement clinker, the anhydrite and the granulated blast furnace slag ground in the first step and coral powder with amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 350m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 30

The embodiment provides island cement which comprises the following components in parts by weight: 64 parts of silicate cement clinker (same as in example 1), 7 parts of anhydrite, 10 parts of granulated blast furnace slag and 20 parts of coral powder with amino alcohol adsorbed on the surface (19 parts of coral powder and 1 part of amino alcohol grinding aid are mixed and ground to prepare the amino alcohol grinding aid, and the amino alcohol grinding aid is the same as in example 6). The preparation process comprises the following steps: crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 410m ² Per kg, and crushing and grinding the granulated blast furnace slag in advance until the specific surface area is more than or equal to 325m ² /kg; adding the silicate cement clinker, the anhydrite and the granulated blast furnace slag ground in the first step and coral powder with amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 410m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 31

The embodiment provides island cement which comprises the following components in parts by weight: 47 parts of silicate cement clinker (same as in example 1), 3 parts of anhydrite, 30 parts of granulated blast furnace slag and 20 parts of coral powder. The preparation process comprises the following steps: step one, crushing coral reef sand, and primarily grinding until the specific surface area is more than or equal to 400m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 400m ² /kg; adding the silicate cement clinker, the anhydrite, the granulated blast furnace slag ground in the first step, the fly ash and the coral powder into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 395m ² And (3) kg, preparing an island cement finished product. The setting time of the seawater mixing and curing and the strength test result of the mortar test piece are shown in Table 1.

Example 32

The embodiment provides island cement which comprises the following components in parts by weight: 55 parts of silicate cement clinker (same as in example 1), 5 parts of anhydrite, 10 parts of granulated blast furnace slag and 30 parts of coral powder. The preparation process comprises the following steps: step one, crushing coral reef sand, and primarily grinding to a specific surface area ≥430m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 430m ² /kg; adding the silicate cement clinker, the anhydrite, the granulated blast furnace slag ground in the first step, the fly ash and the coral powder into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 410m ² And (3) kg, preparing an island cement finished product. The setting time of the seawater mixing and curing and the strength test result of the mortar test piece are shown in Table 1.

Example 33

The embodiment provides island cement which comprises the following components in parts by weight: 45 parts of silicate cement clinker (same as in example 1), 5 parts of anhydrite, 10 parts of granulated blast furnace slag and 40 parts of coral powder. The preparation process comprises the following steps: step one, crushing coral reef sand, and primarily grinding until the specific surface area is more than or equal to 440m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 440m ² /kg; adding the silicate cement clinker, the anhydrite, the granulated blast furnace slag ground in the first step, the fly ash and the coral powder into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 425m ² And (3) kg, preparing an island cement finished product. The setting time of the seawater mixing and curing and the strength test result of the mortar test piece are shown in Table 1.

Example 34

The embodiment provides island cement which comprises the following components in parts by weight: 73 parts of silicate cement clinker (same as in example 1), 7 parts of anhydrite, 15 parts of granulated blast furnace slag and 5 parts of coral powder. The preparation process comprises the following steps: step one, crushing coral reef sand, and primarily grinding until the specific surface area is more than or equal to 380m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 400m ² /kg; adding the silicate cement clinker, the anhydrite, the granulated blast furnace slag ground in the first step, the fly ash and the coral powder into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 418m ² And (3) kg, preparing an island cement finished product. Coagulation time and curing time by mixing and maintaining sea waterThe strength test results of the sand test pieces are shown in table 1.

Example 35

The embodiment provides island cement which comprises the following components in parts by weight: 50 parts of silicate cement clinker (same as in example 1), 5 parts of anhydrite, 5 parts of granulated blast furnace slag and 5 parts of coral powder. The preparation process comprises the following steps: step one, crushing coral reef sand, and primarily grinding until the specific surface area is more than or equal to 470m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 325m ² /kg; adding the silicate cement clinker, the anhydrite, the granulated blast furnace slag ground in the first step, the fly ash and the coral powder into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 434m ² And (3) kg, preparing an island cement finished product. The setting time of the seawater mixing and curing and the strength test result of the mortar test piece are shown in Table 1.

Example 36

The embodiment provides island cement which comprises the following components in parts by weight: 55 parts of silicate cement clinker (same as in example 1), 5 parts of anhydrite, 30 parts of fly ash and 10 parts of coral powder. The preparation process comprises the following steps: step one, crushing coral reef sand, and primarily grinding until the specific surface area is more than or equal to 430m ² Per kg, crushing granulated blast furnace slag and fly ash in advance and grinding respectively until the specific surface area is more than or equal to 335m ² /kg; adding the silicate cement clinker, the anhydrite, the granulated blast furnace slag ground in the first step, the fly ash and the coral powder into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 360m ² And (3) kg, preparing an island cement finished product. The setting time of the seawater mixing and curing and the strength test result of the mortar test piece are shown in Table 1.

Example 37

The embodiment provides island cement which comprises the following components in parts by weight: 72 parts of silicate cement clinker (same as in example 1), 8 parts of anhydrite, 55 parts of granulated blast furnace slag, and 10 parts of coral powder with amino alcohol adsorbed on the surface (9 parts of coral powder and 1 part of amino alcohol grinding aid are mixed and ground to prepare the amino alcohol grinding aid, and the amino alcohol grinding aid is the same as in example 1). Which is a kind ofThe preparation process comprises the following steps: crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 420m ² Per kg, and crushing and grinding the granulated blast furnace slag in advance until the specific surface area is more than or equal to 420m ² /kg; adding the silicate cement clinker, the anhydrite and the granulated blast furnace slag ground in the first step and coral powder with amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is more than or equal to 365m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 38

The embodiment provides island cement which comprises the following components in parts by weight: 55 parts of silicate cement clinker (same as in example 1), 5 parts of anhydrite, 25 parts of fly ash and 15 parts of coral powder with amino alcohol adsorbed on the surface (14 parts of coral powder and 1 part of amino alcohol grinding aid are mixed and ground to prepare the amino alcohol grinding aid, and the amino alcohol grinding aid is the same as in example 2). The preparation process comprises the following steps: crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 440m ² Per kg, and simultaneously crushing and grinding the fly ash till the specific surface area is more than or equal to 440m ² /kg; adding the silicate cement clinker, the anhydrite and the pulverized fly ash obtained in the first step and coral powder with amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing milling until the specific surface area is more than or equal to 420m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 39

The embodiment provides island cement which comprises the following components in parts by weight: 64 parts of silicate cement clinker (same as in example 1), 6 parts of anhydrite, 10 parts of fly ash and 20 parts of coral powder with amino alcohol adsorbed on the surface (19 parts of coral powder and 1 part of amino alcohol grinding aid are mixed and ground to prepare the amino alcohol grinding aid, and the amino alcohol grinding aid is the same as in example 3). The preparation process comprises the following steps: crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 395m ² Kg, at the same time, pulverized coalCrushing and grinding ash to specific surface area greater than or equal to 395m ² /kg; adding the silicate cement clinker, the anhydrite and the pulverized fly ash obtained in the first step and coral powder with amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing milling until the specific surface area is more than or equal to 460m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 40

The embodiment provides island cement which comprises the following components in parts by weight: 55 parts of silicate cement clinker (same as in example 1), 5 parts of anhydrite, 20 parts of fly ash and 20 parts of coral powder with amino alcohol adsorbed on the surface (19 parts of coral powder and 1 part of amino alcohol grinding aid are mixed and ground to prepare the amino alcohol grinding aid, and the amino alcohol grinding aid is the same as in example 4). The preparation process comprises the following steps: crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 470m ² Per kg, and simultaneously crushing and grinding the fly ash till the specific surface area is more than or equal to 345m ² /kg; adding the silicate cement clinker, the anhydrite and the pulverized fly ash obtained in the first step and coral powder with amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing milling until the specific surface area is more than or equal to 394m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 41

The embodiment provides island cement which comprises the following components in parts by weight: 55 parts of silicate cement clinker (same as in example 1), 5 parts of anhydrite, 10 parts of fly ash and 30 parts of coral powder with amino alcohol adsorbed on the surface (29 parts of coral powder and 1 part of amino alcohol grinding aid are mixed and ground to prepare the amino alcohol grinding aid, and the amino alcohol grinding aid is the same as in example 5). The preparation process comprises the following steps: crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 350m ² Per kg, and simultaneously crushing and grinding the fly ash till the specific surface area is more than or equal to 335m ² /kg; step two, silicate cement clinker, anhydrite and pulverized coal ash in the step one and coral powder with amino alcohol adsorbed on the surface are processedAdding the materials into a mixing mill according to parts by weight, and carrying out secondary mixing milling until the specific surface area is more than or equal to 433m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Example 42

The embodiment provides island cement which comprises the following components in parts by weight: 50 parts of silicate cement clinker (same as in example 1), 5 parts of anhydrite, 5 parts of fly ash and 40 parts of coral powder with amino alcohol adsorbed on the surface (38 parts of coral powder and 2 parts of amino alcohol grinding aid are mixed and ground to prepare the amino alcohol grinding aid, and the amino alcohol grinding aid is the same as in example 6). The preparation process comprises the following steps: crushing coral reef sand, and mixing an amino alcohol grinding aid to perform primary grinding until the specific surface area is more than or equal to 365m ² Per kg, and simultaneously crushing and grinding the fly ash till the specific surface area is more than or equal to 405m ² /kg; adding the silicate cement clinker, the anhydrite and the pulverized fly ash obtained in the first step and coral powder with amino alcohol adsorbed on the surface into a mixing mill according to parts by weight, and carrying out secondary mixing milling until the specific surface area is more than or equal to 330m ² And (3) kg, preparing an island cement finished product. The setting time of mixing and curing with fresh water and the strength test results of the mortar test pieces are shown in Table 1.

Table 1 island cement concrete test performance of each example and comparative example

As can be seen from the performance index data of the island cement of examples 1-42, the quality of the product is stable, the technical requirements of 32.5 and 42.5 strength grades of GB/T31289-2014 sea silicate cement can be completely met, and the technical index of the product is even better than the standard. The concrete implementation of the product of the invention superior to GB/T31289-2014 sea silicate cement is as follows: the method has the advantages that the method has no 32.5L strength grade product with low early strength, and can prepare 32.5R and 42.5R island cements with early strength higher than the technical requirements of GB/T31289-2014 sea silicate cement, and further can prepare 52.5 and 52.5R island cements with higher strength grades. In addition, the island cement of the invention has the most outstanding advantages that when the island cement is used for preparing mortar and concrete, fresh water and seawater can be used for mixing and curing.

Among them, as can be seen from the test results of example 1 and comparative example 1-1 and the test results of example 19 and comparative example 19-1, coral powder produced half-type calcium carbonate, single-type calcium carbonate and triple-type calcium carbonate, which were stably present together with ettringite (AFt), and had the effect of accelerating early hydration of cement and accelerating early strength. As can be seen from comparison of the test results of example 1 and comparative examples 1-2 in Table 1, because of the excellent adsorptivity of the microporous structure of coral powder, the rust-inhibiting amino alcohol as a grinding aid has a rust-inhibiting effect superior to that of a coral micropowder mixed grinding tool in which a rust-inhibiting grinding aid is directly added to concrete, and therefore, compared with that of a rust-inhibiting agent directly added to concrete during stirring, the corrosion-resisting effect of the coral powder after adsorbing the amino alcohol and then mixed grinding with other components is better.

The structure morphology of the coral powder is shown in figure 3, and the coral powder has excellent adsorption performance and can effectively adsorb amino alcohol.

The island cement 28d paste hydration products of examples 26, 27, 30 and 35 are shown in FIG. 4, and it can be seen from FIG. 4 that the addition of coral powder promotes a fast early strength phase. Examples 28 and 31 sem images of island cements at different ages are shown in figure 5 from which the early strength, fast hardening phases can be seen.

The island cement formulated concrete of example 1 and comparative examples 1 to 3 was subjected to a steel bar corrosion current density test (concrete mix: 800kg per cubic meter of island cement, 224kg of water, 860kg of fine aggregate, 369kg of coarse aggregate), and the results are shown in fig. 6. As can be seen from fig. 6, the coral powder having the amino alcohol adsorbed on the surface shows excellent rust inhibiting effect.

The invention adopts the technology of blending the active mineral admixture of the fly ash, the ground slag micro powder and the ground coral powder, and realizes the loading of the grinding aid by utilizing the excellent adsorption property of the ground coral powder, and on the basis of the traditional island reef cement, the coral powder which can locally obtain materials and promote the early hydration and the strength growth of the cement and the amino alcohol grinding aid which can protect the reinforcing steel bars from being corroded for a long time are added, so that the problems of the most serious and common corrosion, the chlorine-induced corrosion of the reinforcing steel bars and other marine environments on the cement concrete are solved on the premise of ensuring the compactness, the impermeability and the corrosion resistance of the marine concrete, the fresh water can be adopted, the seawater mixing and the maintenance of the concrete can be adopted, and the transportation cost of the construction materials can be greatly reduced at the same time, so as to meet the requirements of the marine engineering construction.

In the present invention, unless otherwise indicated, scientific and technical terms used herein have the meanings commonly understood by one of ordinary skill in the art. Also, reagents, materials, and procedures used herein are reagents, materials, and conventional procedures widely used in the corresponding field.

Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An island cement, characterized in that:

the island cement comprises the following components in parts by weight:

portland cement clinker: 30-80 parts;

active mineral admixture: 15-65;

gypsum: 2.5 to 6;

the active mineral admixture comprises granulated blast furnace slag, fly ash and coral powder with amino alcohol adsorbed on the surface, wherein the mass ratio of the granulated blast furnace slag to the fly ash to the coral powder with amino alcohol adsorbed on the surface is 5-55:5-35:5-40; or the active mineral admixture comprises granulated blast furnace slag and coral powder with amino alcohol adsorbed on the surface, wherein the mass ratio of the granulated blast furnace slag to the coral powder with amino alcohol adsorbed on the surface is 5-55:5-40; or the active mineral admixture comprises fly ash and coral powder with the surface adsorbed with amino alcohol, and the mass ratio of the fly ash to the coral powder with the surface adsorbed with amino alcohol is 5-35:5-40.

2. The island cement of claim 1, wherein:

the coral powder with the amino alcohol adsorbed on the surface is obtained by grinding coral reef sand and an amino alcohol grinding aid in a mixed mode.

3. The island cement of claim 2, wherein:

wherein the amino alcohol grinding aid is triethylalcohol amine, dimethyl alcohol amine or a mixture of triethylalcohol amine and dimethyl alcohol amine according to the mass ratio of 1-5:1-5.

4. The island cement of claim 2, wherein:

wherein the mass ratio of the coral reef sand to the amino alcohol grinding aid is 5-40:0.5-2.

5. The island cement of claim 1, wherein:

wherein the silicate cement clinker comprises tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite;

the mass ratio of tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetracalcium aluminoferrite is 36-70:15-37:7-15:10-18.

6. The island cement of claim 1, wherein:

wherein the granulated blast furnace slag has a grade of S95 and above.

7. The island cement of claim 1, wherein:

wherein the grade of the fly ash is II grade or above.

8. The island cement of claim 1, wherein:

wherein the specific surface area of the granulated blast furnace slag, the fly ash and the coral powder with the surface adsorbed with the amino alcohol after being ground is not less than 350m ² /kg。

9. A process for the preparation of island cement according to any of claims 1 to 8, wherein:

the method comprises the following steps:

firstly, grinding the broken coral reef sand and an amino alcohol grinding aid in a mixed mode, so that the surface of coral powder adsorbs amino alcohol, and grinding the coral reef sand until the specific surface area of the coral powder with the surface adsorbed with the amino alcohol is not less than 300m ² /kg；

Crushing granulated blast furnace slag and/or fly ash, and grinding to specific surface area not smaller than 300m ² /kg；

Adding the silicate cement clinker, the gypsum and the finely ground active mineral admixture in the step one into a mixing mill according to parts by weight, and carrying out secondary mixing grinding until the specific surface area is not less than 310m ² And (3) kg, preparing an island cement finished product.

10. A method of using the island cement according to any one of claims 1 to 8, wherein:

when the island reef cement and the sand stone or the coral reef sand are used for preparing mortar or concrete, fresh water is adopted for mixing and curing, or seawater is adopted for mixing and curing;

mortar or concrete which is mixed and maintained by fresh water is used for a reinforced concrete structure;

Mortar or concrete which is mixed and maintained by seawater is used for a plain concrete structure.