CN113149492A

CN113149492A - Q-phase-containing phospho-sulphoaluminate cement and preparation method thereof

Info

Publication number: CN113149492A
Application number: CN202110399620.7A
Authority: CN
Inventors: 王守德; 袁俊刚; 颜景华; 赵丕琪; 黄永波; 程新
Original assignee: University of Jinan
Current assignee: University of Jinan
Priority date: 2021-04-14
Filing date: 2021-04-14
Publication date: 2021-07-23
Anticipated expiration: 2041-04-14
Also published as: CN113149492B

Abstract

The invention relates to a Q-phase-containing phosphosulphate aluminate cement and a preparation method thereof, belonging to the technical field of cementing materials. The cement clinker is prepared from Q phase-calcium sulphoaluminate (C)₄A₃Calcium Phosphosulphoaluminate (CPSA) -dicalcium silicate (C)₂S) -Tetracalcium aluminoferrite (C)₄AF) five mineral phases. The invention can realize C at lower temperature in iron-rich environment₄A₃Phase $ Q, $ C₄AF and C₈A₆P coexists, namely C with high hydration activity is introduced₈A₆P and Q phases, and effectively reduce C in the system₂The generation of AS can greatly improve the hydration strength of a clinker system, has lower sintering temperature compared with sulphoaluminate cement, and has good early and long-term mechanical properties.

Description

Q-phase-containing phospho-sulphoaluminate cement and preparation method thereof

Technical Field

The invention relates to a Q-phase-containing phosphosulphate aluminate cement and a preparation method thereof, belonging to the technical field of cementing materials.

Background

In the last 70 th century, the national institute of building materials invented sulphoaluminate cement, the hydration product of which is calcium sulphoaluminate (C)₄A₃Calcium silicate (C)₂S) is taken as a main component,the early hydration reaction speed is high, and the product has the characteristics of quick hardening and early strength and good durability such as high impermeability, frost resistance, corrosion resistance and the like. Compared with common Portland cement, the sulphoaluminate cement has lower sintering temperature and less carbon emission, and is high-performance cement with low energy consumption and environmental protection. However, in practical application, the defects that the growth strength is slow in the middle and later periods, the shrinkage occurs after long-term use and the like are found. To this end, researchers have attempted to introduce simultaneously two minerals with intermediate and late strength development, calcium phosphoaluminate (C), in a sulfoaluminate, aluminous cement clinker system₈A₆P) and Q phases to improve the later strength thereof. But C in the novel clinker system₄A₃Phase $ Q, $ C₄AF and C₈A₆The forming temperatures of the four mineral phases P are different, a large amount of mineral phases are difficult to form in the same temperature range, and meanwhile, the gehlenite with low hydration activity is easy to appear in a complex system.

Disclosure of Invention

Aiming at the problems, the invention provides the Q-phase-containing phosphosulfoaluminate cement which can realize C at a lower temperature in an iron-rich environment₄A₃Phase $ Q, $ C₄AF and C₈A₆P coexists, and the invention has the advantages that C with high hydration activity is introduced₈A₆P and Q phases, and effectively reduce C in the system₂The generation of AS can greatly improve the hydration strength of a clinker system, has lower sintering temperature compared with sulphoaluminate cement, and has good early and long-term mechanical properties.

In order to achieve the purpose, the invention adopts the technical scheme that:

the invention provides a Q-phase-containing phospho-sulphoaluminate cement, the cement clinker is composed of Q-phase-calcium sulphoaluminate (C)₄A₃Calcium Phosphosulphoaluminate (CPSA) -dicalcium silicate (C)₂S) -Tetracalcium aluminoferrite (C)₄AF) five mineral phases.

Further, the mineral composition of the cement clinker is specifically as follows:

phase Q: 10 to 30 percent;

C₄A₃$：30-60%；

CPSA：15-30%；

C₂S：5-15%；

C₄AF：5-10%。

the invention also provides a preparation method of the Q-phase-containing phosphosulfoaluminate cement clinker, which comprises the following steps: calculating and weighing raw materials according to the mineral proportion, and sieving by a standard sieve to obtain 6-10% of screen residue; then stirring by a ball mill, drying and preparing a sample; and (3) putting the sample into a low-temperature oven for drying, then putting the sample into a high-temperature resistance furnace for calcining, taking out the sample and then quenching to obtain the cement clinker.

Further, the particle size of the standard sieve is 200 meshes.

Further, the calcination process is carried out at 1330 ℃ for 2 h.

The invention has the beneficial effects that: the invention can realize C at lower temperature in iron-rich environment₄A₃Phase $ Q, $ C₄AF and C₈A₆P coexists, namely C with high hydration activity is introduced₈A₆P and Q phases, and effectively reduce C in the system₂The generation of AS can greatly improve the hydration strength of a clinker system, has lower sintering temperature compared with sulphoaluminate cement, and has good early and long-term mechanical properties.

Detailed Description

The technical solution of the present invention is further explained and illustrated by the following specific embodiments.

The raw materials that this experiment adopted are laboratory analysis pure reagent, specifically include: tricalcium phosphate, calcium carbonate, calcium sulfate, iron oxide, alumina, titanium dioxide, and basic magnesium carbonate.

Example 1

The raw material comprises the following components in percentage by weight:

tricalcium phosphate: 29.2 percent

Calcium carbonate: 21.8 percent

Calcium sulfate: 18.2 percent of

Iron oxide: 4.4 percent

Alumina: 19.6 percent

Titanium dioxide: 2.5 percent

Basic magnesium carbonate: 4.3 percent of

Example 2

The raw material comprises the following components in percentage by weight:

tricalcium phosphate: 33.2 percent

Calcium carbonate: 20.8 percent of

Calcium sulfate: 16.7 percent

Iron oxide: 4.2 percent of

Alumina: 18.9 percent

Titanium dioxide: 2.2 percent of

Basic magnesium carbonate: 4.0 percent

Example 3

The raw material comprises the following components in percentage by weight:

tricalcium phosphate: 35.2 percent of

Calcium carbonate: 20.3 percent of

Calcium sulfate: 17.4 percent

Iron oxide: 3.0 percent

Alumina: 17.8 percent

Titanium dioxide: 2.5 percent

Basic magnesium carbonate: 3.8 percent of

Comparative example 1

The raw material comprises the following components in percentage by weight:

tricalcium phosphate: 30.2 percent

Calcium carbonate: 23.1 percent

Calcium sulfate: 18.7 percent

Iron oxide: 4.9 percent

Alumina: 20.1 percent of

Titanium dioxide: 3.0 percent

In examples 1-3 and comparative example 1, 200g of raw materials are calculated and weighed according to the mineral proportion, the particle size is that the raw materials pass through a standard sieve of 200 meshes, and the residue on sieve is 6-10%. And then stirring by using a ball mill, drying and preparing a sample. The sample is 3X 1.5X 0.2cm³And (3) putting the cuboid block into a low-temperature oven for drying, then putting the cuboid block into a high-temperature resistance furnace for calcining, keeping the temperature for 2 hours at 1330 ℃, taking out and quenching to obtain the cement clinker. The clinker and the steel ball are put into a ball milling tank to be milled to a certain fineness and are sieved by a 200-mesh sieve, and the residue on the sieve is controlled to be 0.2-0.5%. The mold is 2X 2cm³And (3) forming, wherein the water-cement ratio is 0.35, curing in a room-temperature curing chamber for 24h, demolding, putting the samples of each example and each comparative example into a curing box, curing for 3d, 7d and 28d respectively under the standard conditions of constant temperature and constant humidity, and then respectively carrying out compressive strength test, wherein the specific results are shown in table 1.

TABLE 1

Claims

1. A Q-phase containing phospho-sulphoaluminate cement is characterized in that the cement clinker is prepared from Q-phase calcium sulphoaluminate (C)₄A₃Calcium Phosphosulphoaluminate (CPSA) -dicalcium silicate (C)₂S) -Tetracalcium aluminoferrite (C)₄AF) five mineral phases.

2. The Q-phase containing phosphosulfoaluminate cement of claim 1, wherein the mineral composition of the cement clinker is specifically:

phase Q: 10 to 30 percent;

C₄A₃$：30-60%；

CPSA：15-30%；

C₂S：5-15%；

C₄AF：5-10%。

3. a process for the preparation of a Q-phase containing phosphosulfoaluminate cement clinker according to claim 1 or 2, characterized in that it comprises the following steps: calculating and weighing raw materials according to the mineral proportion, and sieving by a standard sieve to obtain 6-10% of screen residue; then stirring by a ball mill, drying and preparing a sample; and (3) putting the sample into a low-temperature oven for drying, then putting the sample into a high-temperature resistance furnace for calcining, taking out the sample and then quenching to obtain the cement clinker.

4. The method of claim 3, wherein the standard sieve has a particle size of 200 mesh.

5. The method of claim 3 or 4, wherein the calcination process is performed at 1330 ℃ for 2 h.