CN116535163A

CN116535163A - Concrete blended with steel slag powder and preparation method thereof

Info

Publication number: CN116535163A
Application number: CN202310514823.5A
Authority: CN
Inventors: 于震; 冀秀君; 杨建家; 刘增辉; 史海旺; 刘雅彬; 郑莞星; 侯俊宏; 李正凯; 张永强
Original assignee: Jinyu Jidong Tangshan Concrete Environmental Protection Technology Group Co ltd
Current assignee: Jinyu Jidong Tangshan Concrete Environmental Protection Technology Group Co ltd
Priority date: 2023-05-09
Filing date: 2023-05-09
Publication date: 2023-08-04

Abstract

The application relates to the field of concrete, and in particular discloses concrete blended with steel slag powder and a preparation method thereof. The concrete blended with the steel slag powder comprises the following raw materials in parts by weight: 180-190 parts of cement, 100-110 parts of mineral powder, 1700-1800 parts of aggregate, 170-200 parts of water, 20-30 parts of reinforcing fiber, 90-100 parts of composite steel slag powder, 4-10 parts of water reducer and 8-10 parts of additive; the composite steel slag powder comprises steel slag powder, fly ash and desulfurized gypsum, wherein the mass ratio of the steel slag powder to the fly ash to the desulfurized gypsum is (3-5): (2-4): (0.2-0.4); the prepared concrete has the advantage of good compressive strength.

Description

Concrete blended with steel slag powder and preparation method thereof

Technical Field

The application relates to the field of concrete, in particular to concrete blended with steel slag powder and a preparation method thereof.

Background

China is a world steel production country, the yield of crude steel reaches 7.16 hundred million tons in 2012, 2 hundred million tons of blast furnace slag and nearly 1 hundred million tons of various steel slag are produced in the smelting process, the slag is basically comprehensively utilized at present, the slag micropowder production technology and the product application are very mature, and the comprehensive utilization rate exceeds 80%; the steel slag is waste slag discharged in the steelmaking process and belongs to the tax preferential catalogue of resource comprehensive utilization enterprises. Under the background that other raw material resources are increasingly scarce and the price is continuously rising, steel slag is popular as a novel available resource, and the steel slag is subjected to iron removal treatment due to high hardness and large grinding difficulty, so that the comprehensive utilization of the steel slag is not fully utilized in a deeper level at present, the comprehensive utilization rate is only 20%, a large amount of land resources are occupied by accumulated steel slag in the past, the ecological environment is seriously polluted, a large amount of available resources are wasted, and the steel slag belongs to industrial waste slag to be treated urgently.

In the related art, steel slag is added into concrete instead of cement, but the strength effect of the prepared concrete is not ideal.

Disclosure of Invention

In order to improve the compressive strength of steel slag concrete, the application provides concrete blended with steel slag powder and a preparation method thereof.

In a first aspect, the present application provides a concrete blended with steel slag powder, which adopts the following technical scheme:

the concrete blended with the steel slag powder comprises the following raw materials in parts by weight: 180-190 parts of cement, 100-110 parts of mineral powder, 1700-1800 parts of aggregate, 170-200 parts of water, 20-30 parts of reinforcing fiber, 90-100 parts of composite steel slag powder, 4-10 parts of water reducer and 8-10 parts of additive;

the composite steel slag powder comprises steel slag powder, fly ash and desulfurized gypsum, wherein the mass ratio of the steel slag powder to the fly ash to the desulfurized gypsum is (3-5): (2-4): (0.2-0.4).

By adopting the technical scheme, the composite of the steel slag micropowder and the fly ash can play a role in superposition on the development of the concrete strength in the later stage, the cement plays a main role in early strength of the concrete, and the pozzolanic effect of the fly ash is mainly exerted in the later stage. The activity of the steel slag micropowder is poor, and the hydration effect of the steel slag micropowder is mainly shown in the later stage. Ca (OH) 2 generated by later cement hydration can excite the pozzolanic effect of steel slag micropowder and fly ash, so that the steel slag micropowder and the fly ash have complementary effects on the development of the later strength of concrete;

the desulfurization gypsum participates in the system reaction to generate ettringite crystals, needle-shaped ettringite crystals and C-S-H gel are staggered to grow to form a compact network structure, the porosity is reduced, the desulfurization gypsum plays an active excitation role on the fly ash, the reaction degree is deepened, and the C-S-H in the test block is increased

The content of the calcium silicate hydrate also promotes the conversion of high calcium-silicon ratio (c/s) calcium silicate hydrate in the hydration product to low c/s calcium silicate hydrate, so that the mechanical property of the gel test block is improved;

the steel slag micropowder, the fly ash and the desulfurized gypsum are mutually influenced and excited, so that the mechanical properties of the concrete are improved together.

Preferably, the mass ratio of the steel slag powder to the fly ash to the desulfurized gypsum is 3:2:0.3.

by adopting the technical scheme, the mass ratio of the steel slag powder to the fly ash to the desulfurized gypsum is 3:2: at 0.3, the compressive strength of the concrete is better.

Preferably, anhydrous sodium sulphate is also added into the composite steel slag powder.

By adopting the technical scheme, the activity and stability of the steel slag are improved by taking the anhydrous sodium sulphate and the desulfurized gypsum as the excitants, and the influence of free calcium, metallic iron and magnesium oxide on the stability is eliminated.

Preferably, the weight ratio of the anhydrous sodium sulphate to the desulfurized gypsum is (0.7-0.8): 1.

By adopting the technical scheme, when the weight ratio of the anhydrous sodium sulphate to the desulfurized gypsum is (0.7-0.8): 1, the mechanical properties of the prepared concrete are better.

Preferably, the additive comprises triethanolamine, diethanol monoisopropanolamine and disodium calcium ethylenediamine tetraacetate.

By adopting the technical scheme, the triethanolamine, the diethanol monoisopropanolamine and the disodium calcium ethylenediamine tetraacetate are additives with good grinding assisting performance, and besides, the triethanolamine, the diethanol monoisopropanolamine and the disodium calcium ethylenediamine tetraacetate have good complexation, so that the dissolution of dense mineral components on the surface layer of the steel slag can be effectively promoted, and again, the dissolution rate of the mineral components is continuously increased under the continuous complexation of the polyalcohol amine of the steel slag, so that the hydration rate of the steel slag can be improved, the activity of the steel slag at each age can be improved, and the mechanical property of the concrete can be improved.

Preferably, the mass ratio of the triethanolamine, the diethanol monoisopropanolamine and the disodium calcium ethylenediamine tetraacetate is (2-3): (3-4):1.

By adopting the technical scheme, the mass ratio of the triethanolamine, the diethanol monoisopropanolamine and the disodium calcium ethylenediamine tetraacetate is (2-3): and (3-4) in the process of 1, the mechanical property of the prepared concrete is good.

Preferably, the water reducer is a polycarboxylic acid type high-performance water reducer.

By adopting the technical scheme, the polycarboxylic acid high-performance water reducer has excellent water reducing performance and stable performance.

In a second aspect, the present application provides a method for preparing concrete blended with steel slag powder, which adopts the following technical scheme:

the preparation method of the concrete blended with the steel slag powder comprises the following preparation steps: s1: mixing and grinding 180-190 parts of cement, 100-110 parts of mineral powder, 90-100 parts of composite steel slag powder and 8-10 parts of additive to obtain a mixture;

s2: and uniformly mixing the mixture, 4-10 parts of water reducer, 1700-1800 parts of aggregate, 170-200 parts of water and 20-30 parts of reinforcing fiber to obtain the concrete blended with the steel slag powder.

In summary, the present application has the following beneficial effects:

1. the composite of the steel slag micropowder and the fly ash can play a role in superposition on the development of the concrete strength in the later stage, the cement plays a main role in the early strength of the concrete, and the pozzolanic effect of the fly ash is mainly exerted in the later stage. The activity of the steel slag micropowder is poor, and the hydration effect of the steel slag micropowder is mainly shown in the later stage. Ca (OH) 2 generated by later cement hydration can excite the pozzolanic effect of steel slag micropowder and fly ash, so that the steel slag micropowder and the fly ash have complementary effects on the development of the later strength of concrete; the desulfurization gypsum participates in the system reaction to generate ettringite crystals, needle-shaped ettringite crystals and C-S-H gel are staggered to grow to form a compact network structure, so that the porosity is reduced, the desulfurization gypsum plays an active excitation role on the fly ash, the reaction degree is deepened, the C-S-H content in a test block is increased, and meanwhile, the conversion of high-calcium-silicon-ratio (C/S) hydrated calcium silicate in a hydration product into low-C/S hydrated calcium silicate is promoted, so that the mechanical property of a gelled test block is improved; the steel slag micropowder, the fly ash and the desulfurized gypsum are mutually influenced and excited, so that the mechanical properties of the concrete are improved;

2. the anhydrous sodium sulphate and the desulfurized gypsum are used as an exciting agent to jointly improve the activity and stability of the steel slag and eliminate the influence of free calcium, metallic iron and magnesium oxide on the stability;

3. the triethanolamine, the diethanol monoisopropanolamine and the disodium calcium ethylenediamine tetraacetate are additives with good grinding assisting performance, and besides, the triethanolamine, the diethanol monoisopropanolamine and the disodium calcium ethylenediamine tetraacetate have good complexation, so that the dissolution of dense mineral components on the surface layer of the steel slag can be effectively promoted, and again, the dissolution rate of the mineral components is continuously increased under the continuous complexation of the polyalcohol amine of the steel slag, so that the hydration rate of the steel slag can be improved, and the activity of the steel slag in each age can be improved.

Detailed Description

Raw material source

The steel slag powder is from Hebei jin and xi iron and steel group Co., ltd;

cement is from Jidong cement 28390 by Qingjia, p.ii 42.5R cement;

the mineral powder is from a processing plant of Lingshu county zeming mineral products, and S95 grade mineral powder;

the fly ash is from the san-ya mineral products limited company of Lingshu county, class F class II fly ash;

the water reducing agent is from the company of cement admixture Limited in the Jidong of Tangshan;

the desulfurized gypsum is from the mineral processing plant of Chengjiang in Lingshu county;

the anhydrous sodium sulphate is from Weifang Jingyang chemical industry Co., ltd;

triethanolamine from Zibo chemical industry Co., ltd;

the diethanol monoisopropanolamine comes from new material limited company in Jinan spring pool;

disodium calcium edetate is available from the western safety and Yuhua biotechnology company.

The present application is further described in detail below in connection with the preparation examples and examples.

Preparation example

Preparation example 1

The composite steel slag powder is prepared by grinding and mixing 3kg of steel slag powder, 2kg of fly ash, 0.2kg of desulfurized gypsum and 0.14kg of anhydrous sodium sulphate.

Preparation example 2

The composite steel slag powder is prepared by grinding and mixing 3kg of steel slag powder, 2kg of fly ash, 0.3kg of desulfurized gypsum and 0.21kg of anhydrous sodium sulphate.

Preparation example 3

The composite steel slag powder is prepared by grinding and mixing 4kg of steel slag powder, 3kg of fly ash, 0.3kg of desulfurized gypsum and 0.24kg of anhydrous sodium sulphate.

Preparation example 4

The composite steel slag powder is prepared by grinding and mixing 5kg of steel slag powder, 4kg of fly ash, 0.4kg of desulfurized gypsum and 0.30kg of anhydrous sodium sulphate.

Preparation example 5

The composite steel slag powder is prepared by grinding and mixing 5kg of steel slag powder, 2kg of fly ash, 0.4kg of desulfurized gypsum and 0.30kg of anhydrous sodium sulphate.

Preparation example 6

The composite steel slag powder is prepared by grinding and mixing 2kg of steel slag powder, 1kg of fly ash, 0.1kg of desulfurized gypsum and 0.05kg of anhydrous sodium sulphate.

Preparation example 7

The composite steel slag powder is prepared by grinding and mixing 6kg of steel slag powder, 5kg of fly ash, 0.5kg of desulfurized gypsum and 0.5kg of anhydrous sodium sulphate.

Preparation example 8

The admixture is prepared by mixing 2kg of triethanolamine, 3kg of diethanol monoisopropanolamine and 1kg of disodium calcium ethylenediamine tetraacetate.

Preparation example 9

The admixture is prepared by mixing 2.5kg of triethanolamine, 3.5kg of diethanol monoisopropanolamine and 1kg of disodium calcium ethylenediamine tetraacetate.

Preparation example 10

The admixture is prepared by mixing 3kg of triethanolamine, 4kg of diethanol monoisopropanolamine and 1kg of disodium calcium ethylenediamine tetraacetate.

PREPARATION EXAMPLE 11

The admixture is prepared by mixing 1.8kg of triethanolamine, 2.8kg of diethanol monoisopropanolamine and 0.8kg of disodium calcium ethylenediamine tetraacetate.

Preparation example 12

The admixture is prepared by mixing 3.2kg of triethanolamine, 4.2kg of diethanol monoisopropanolamine and 1.2kg of disodium calcium ethylenediamine tetraacetate.

Examples

Example 1

The concrete blended with the steel slag powder comprises the following preparation steps:

s1: 180kg of cement, 100kg of mineral powder, 90kg of composite steel slag powder and 8kg of additive are mixed and ground to obtain a mixture;

s2: uniformly mixing the mixture, 4kg of polycarboxylic acid water reducer, 1700kg of quartz stone, 170kg of water and 20kg of steel fiber to obtain concrete blended with steel slag powder; wherein the composite steel slag powder is from preparation example 1; the admixture was from preparation 8.

Example 2

s1: 185kg of cement, 105kg of mineral powder, 95kg of composite steel slag powder and 9kg of additive are mixed and ground to obtain a mixture;

s2: uniformly mixing the mixture, 7kg of polycarboxylic acid water reducer, 1750kg of quartz stone, 180kg of water and 25kg of steel fiber to obtain concrete blended with steel slag powder; wherein the composite steel slag powder is from preparation example 1; the admixture was from preparation 8.

Example 3

s1: mixing and grinding 190kg of cement, 110kg of mineral powder, 100kg of composite steel slag powder and 10kg of additive to obtain a mixture;

s2: uniformly mixing the mixture, 10kg of polycarboxylic acid water reducer, 1800kg of quartz stone, 200kg of water and 30kg of steel fiber to obtain concrete blended with steel slag powder; wherein the composite steel slag powder is from preparation example 1; the admixture was from preparation 8.

Example 4

Example 4 differs from example 3 in that the composite steel slag powder is from preparation example 2, and the remaining steps are the same as example 3.

Example 5

Example 5 is different from example 3 in that the composite steel slag powder is derived from preparation example 3, and the rest steps are the same as example 3.

Example 6

Example 6 is different from example 3 in that the composite steel slag powder is derived from preparation example 4, and the rest steps are the same as example 3.

Example 7

Example 7 differs from example 3 in that the composite steel slag powder is from preparation example 5, and the remaining steps are the same as example 3.

Example 8

Example 8 differs from example 3 in that the composite steel slag powder is from preparation example 6, and the remaining steps are the same as example 3.

Example 9

Example 9 differs from example 3 in that the composite steel slag powder is from preparation example 7, and the remaining steps are the same as example 3.

Example 10

Example 10 differs from example 4 in that the admixture is from preparation 9 and the remainder of the procedure is the same as example 4.

Example 11

Example 11 differs from example 4 in that the admixture is from preparation 10 and the remaining steps are the same as in example 4.

Example 12

Example 12 differs from example 4 in that the admixture is from preparation 11 and the remainder of the procedure is the same as example 4.

Example 13

Example 13 differs from example 4 in that the admixture is from preparation 12 and the remainder of the procedure is the same as example 4.

Example 14

Example 14 differs from example 4 in that no additive was added and the rest of the procedure was the same as example 4.

Comparative example

Comparative example 1

Comparative example 1 is different from example 1 in that no steel slag powder was added to the composite steel slag powder, and the remaining steps are the same as example 1.

Comparative example 2

Comparative example 2 was different from example 1 in that fly ash was not added to the composite slag powder, and the remaining steps were the same as in example 1.

Comparative example 3

Comparative example 3 is different from example 1 in that no desulfurized gypsum is added to the composite slag powder, and the rest of the steps are the same as example 1.

Comparative example 4

Comparative example 4 was different from example 1 in that the steel slag powder was entirely replaced with fly ash, and the rest of the steps were the same as in example 1.

Comparative example 5

Comparative example 5 differs from example 1 in that fly ash was replaced by steel slag powder in its entirety, and the rest of the steps were the same as in example 1.

Comparative example 6

Comparative example 6 was different from example 1 in that the entire amount of the desulfurized gypsum was replaced with cement, and the rest of the procedure was the same as that of example 1.

Performance test

Detection method/test method

The concrete samples of examples 1 to 14 and comparative examples 1 to 6 were tested for compressive strength of 7d and 28d, respectively, with reference to the test method for physical and mechanical properties of concrete, GB/T50081-2019.

TABLE 1 comparison of mechanical Properties of concrete samples prepared in examples 1 to 14 and comparative examples 1 to 6

	7d compressive Strength (Mpa)	28d compressive Strength (Mpa)
			Example 1	23.7	45.1
Example 2	24.6	46.2
			Example 3	26.1	47.8
Example 4	27.8	48.6
			Example 5	27.3	48.7
Example 6	27	48.3
			Example 7	27.3	48.1
Example 8	24.2	47.3
			Example 9	25.3	46.4
Example 10	28.5	49.3
			Example 11	28.3	49
Example 12	28	49.8
			Example 13	28.1	49
Example 14	24.1	45.6
			Comparative example 1	18.3	32.1
Comparative example 2	17.4	33.3
			Comparative example 3	19.3	36.8
Comparative example 4	20.1	39.2
			Comparative example 5	20.4	40.1
Comparative example 6	21.1	42.1

As can be seen by combining the data of examples 1-14 and table 1, the combined steel slag powder and the additive can be used together to effectively improve the early and later strengths of the concrete and the mechanical properties of the concrete;

the data of examples 1-3 are combined, so that the early strength and the later strength of the concrete prepared in example 3 are higher, and the mechanical properties are better;

the mass ratio of the steel slag powder, the fly ash, the desulfurized gypsum and the anhydrous sodium sulphate is 3 as shown by combining the data of examples 3-9: 2:0.3: the composite steel slag powder prepared in 0.21 is added into concrete, so that the compressive strength of the concrete is better;

the data of the embodiment 4 and the embodiment 10-14 show that the additive triethanolamine, diethanol monoisopropanolamine and disodium calcium ethylenediamine tetraacetate can effectively improve the compressive strength of the concrete, and the triethanolamine, diethanol monoisopropanolamine and disodium calcium ethylenediamine tetraacetate have better complexation, so that the dissolution of compact mineral components on the surface layer of the steel slag can be effectively promoted, and again, the dissolution rate of the mineral components of the steel slag is continuously increased under the continuous complexation of the polyalcohol amine, so that the hydration rate of the steel slag can be improved, and the mechanical property of the concrete is improved; in addition, as can be seen from the data comparison, the mass ratio of triethanolamine, diethanol monoisopropanolamine and disodium calcium ethylenediamine tetraacetate is (2-3): (3-4) 1), the mechanical property of the prepared concrete is better;

the data of the embodiment 1 and the comparative examples 1-6 show that the steel slag micropowder, the fly ash and the desulfurization stone can effectively and synergistically act, and the three systems of the steel slag micropowder, the fly ash and the desulfurization gypsum are mutually influenced and excited, so that the mechanical property of the concrete is effectively improved.

The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.

Claims

1. The concrete blended with the steel slag powder is characterized by comprising the following raw materials in parts by weight: 180-190 parts of cement, 100-110 parts of mineral powder, 1700-1800 parts of aggregate, 170-200 parts of water, 20-30 parts of reinforcing fiber, 90-100 parts of composite steel slag powder, 4-10 parts of water reducer and 8-10 parts of additive;

2. A concrete incorporating steel slag powder as claimed in claim 1, wherein: the mass ratio of the steel slag powder to the fly ash to the desulfurized gypsum is 3:2:0.3.

3. a concrete incorporating steel slag powder as claimed in claim 1, wherein: the composite steel slag powder is also added with anhydrous sodium sulphate.

4. A slag powder blended concrete according to claim 3, wherein: the weight ratio of the anhydrous sodium sulfate to the desulfurized gypsum is (0.7-0.8) 1.

5. A concrete incorporating steel slag powder as claimed in claim 1, wherein: the additive comprises triethanolamine, diethanol monoisopropanolamine and disodium calcium ethylenediamine tetraacetate.

6. The concrete blended with steel slag powder according to claim 5, wherein: the mass ratio of the triethanolamine to the diethanol monoisopropanolamine to the disodium calcium ethylenediamine tetraacetate is (2-3): (3-4):1.

7. A concrete incorporating steel slag powder as claimed in claim 1, wherein: the water reducer is a polycarboxylic acid high-performance water reducer.

8. A concrete incorporating steel slag powder as claimed in any one of claims 1 to 7 wherein: the preparation method comprises the following preparation steps:

s1: mixing and grinding 180-190 parts of cement, 100-110 parts of mineral powder, 90-100 parts of composite steel slag powder and 8-10 parts of additive to obtain a mixture;