阅读说明：本技术 一种激发c3s水化的复合胶凝材料 (Excitation C3S hydrated composite gelled material ) 是由 兰明章 裴天蕊 陈智丰 杨寒冰 任伟峰 王剑锋 崔素萍 王亚丽 于 2021-01-20 设计创作，主要内容包括：一种激发C-3S水化的复合胶凝材料涉及建筑材料领域,提供水化硬化快,早期强度优异的水泥基复合胶凝材料。该复合胶凝材料包括以下质量分数配制的原料：C-3S单矿90％,高温石膏3％～8％,无水硫铝酸钙2％～7％。本发明通过无水硫铝酸钙、高温石膏、C-3S的协同水化反应,加快C-3S的水化,快速形成钙矾石和凝胶相并使得结构致密,从而在水泥的早期水化中达到较高的强度。(Excitation C 3 The S hydrated composite cementing material relates to the field of building materials, and provides a cement-based composite cementing material with fast hydration hardening and excellent early strength. The composite cementing material comprises the following raw materials in parts by mass: c 3 90 percent of S monoore, 3 to 8 percent of high-temperature gypsum and 2 to 7 percent of anhydrous calcium sulphoaluminate. The invention uses anhydrous calcium sulphoaluminate, high-temperature gypsum and C 3 S synergistic hydration reaction to accelerate C 3 Hydration of S quickly forms ettringite and gel phase and makes the structure compact, thus achieving higher strength in early hydration of cement.)

1. For C₃The S hydrated early-strength composite cementing material is characterized by comprising the following raw materials in parts by mass: c₃90 percent of S monoore, 3 to 8 percent of high-temperature gypsum and 2 to 7 percent of anhydrous calcium sulphoaluminate.

The firing method of the anhydrous calcium sulphoaluminate comprises the following steps: calcium carbonate, aluminum oxide and calcium sulfate powder are mixed according to CaCO₃：Al₂O₃：Mixing the raw materials according to the molar ratio, tabletting and forming, calcining at 1350 ℃ for 4h, quenching by blowing, cooling to room temperature within 1min, grinding until all the raw materials pass through a 200-mesh sieve,

the high-temperature gypsum is obtained by calcining anhydrite at 450 ℃ for 2 hours in a high-temperature furnace.

Technical Field

The invention relates to the field of building materials, in particular to an early strength type composite cementing material of excited tricalcium silicate (C3S).

Background

Popularization and application of the assembly type building provide higher requirements for rapid production of prefabricated parts, and in order to accelerate the turnover rate of a die and improve the production efficiency of enterprises, the early strength of the prefabricated parts naturally needs to reach the standard as soon as possible. At present, the most common method for maintaining the prefabricated parts is steam maintenance, but the method has high energy consumption and is not environment-friendly, and the parts are easily subjected to heat damage, so that the problems of service safety and service life of the parts exist.

Tricalcium silicate is the most abundant mineral in portland cement and is the primary source of its strength. The anhydrous calcium sulphoaluminate mineral has the properties of quick hardening, early strength and expansion, and is the main clinker mineral of sulphoaluminate cement. The gypsum is an important industrial byproduct, the crystal of the gypsum has ultrahigh activity after being heated at high temperature, and the anhydrous calcium sulphoaluminate and the high-temperature gypsum are used as the regulation and control cementing materials and added into the Portland cement, so that the chemical reaction balance of the cement is broken, the hydration degree of C3S is promoted and improved, the early-stage rapid hydration of C3S is realized, the early-stage strength of the Portland cement is greatly improved, and the performance quality of the cement is improved to a certain extent.

Disclosure of Invention

The invention aims to invent a method for exciting C₃The S hydrated composite cementing material has ultrahigh early strength, can demould the prefabricated part as early as possible, and reduces the turnover period of a prefabricated part mould.

The composite cementing material prepared by the invention comprises the following ingredients:

the invention relates to an early-strength composite cementing material for prefabricated parts, which is characterized by comprising the following raw materials in parts by mass: : c₃90 percent of S monoore, 3 to 8 percent of high-temperature gypsum and 2 to 7 percent of anhydrous calcium sulphoaluminate. Wherein the anhydrous calcium sulphoaluminate is a laboratory pure reagent calcined monoore, and the purity of the anhydrous calcium sulphoaluminate is more than 97.5 percent; the high temperature gypsum isCalcining anhydrite for 2 hours at 450 ℃ in a high-temperature furnace.

The preparation method of the early-strength composite cementing material for the prefabricated part comprises the following steps:

step one, firing anhydrous calcium sulphoaluminate monoore: calcium carbonate, aluminum oxide and calcium sulfate powder are mixed according to CaCO₃：Al₂O₃：Mixing the raw materials according to the molar ratio proportion, tabletting and forming, calcining at 1350 ℃ for 4h, rapidly taking out at high temperature, quenching by blowing, cooling to room temperature within 1min, and grinding until all the raw materials pass through a 200-mesh sieve;

step two, calcining gypsum: the anhydrite is heated at a temperature of 450 ℃ for 2 h.

And step three, weighing the components according to a preset proportion, and uniformly mixing according to the preset proportion. Wherein the experimental group A is determined by high-temperature gypsum/anhydrous calcium sulphoaluminate ═ 2 and has a chemical formulaIt is known that, when the molar ratio of gypsum to anhydrous calcium sulfoaluminate is 2, ettringite can be completely generated, and the alkaline environment provided by the hydration of clinker can also promote the hydration of clinker.

The invention has the following specific effects:

the invention is used for exciting C₃The S hydrated composite cementing material is prepared by mixing anhydrous calcium sulphoaluminate and high-temperature gypsum, and has simple ingredients and excellent performance. Promoting C while anhydrous calcium sulphoaluminate and high-temperature gypsum are hydrated₃The early hydration of S has greatly increased heat release rate and accelerated hydration, so that the S has higher early strength.

Drawings

FIG. 1 is a molar ratio C₃Influence of S compressive Strength

FIG. 2 is a molar ratio C₃Effect of hydration Heat Release Rate

FIG. 3 is a molar ratio C₃Influence of hydration exotherm

Detailed Description

The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.

The cement amounts for each example are as follows:

example 1

The molar ratio M of the high-temperature gypsum to the anhydrous calcium sulphoaluminate is 2, and the mass percent of the high-temperature gypsum to the anhydrous calcium sulphoaluminate is C₃S90%, anhydrous calcium sulphoaluminate 6.92% and high-temperature gypsum 3.08%.

Example 2

The molar ratio M of the high-temperature gypsum to the anhydrous calcium sulphoaluminate is 5, and the mass percent of the high-temperature gypsum to the anhydrous calcium sulphoaluminate is C₃S90%, anhydrous calcium sulphoaluminate 4.73% and high-temperature gypsum 5.27%.

Example 3

The molar ratio M of the high-temperature gypsum to the anhydrous calcium sulphoaluminate is 8, and the mass percent of the high-temperature gypsum to the anhydrous calcium sulphoaluminate is C₃S90%, anhydrous calcium sulphoaluminate 3.59% and high-temperature gypsum 6.41%.

Example 4

The molar ratio M of the high-temperature gypsum to the anhydrous calcium sulphoaluminate is 11, and the mass percent of the high-temperature gypsum to the anhydrous calcium sulphoaluminate is C₃90 percent of S, 2.90 percent of anhydrous calcium sulphoaluminate and 7.10 percent of high-temperature gypsum.

In the examples, C is mixed according to a predetermined ratio₃S, uniformly stirring high-temperature gypsum and anhydrous calcium sulfoaluminate, placing the mixture into a clean slurry stirring pot, determining the water-cement ratio to be 0.35, stirring the mixture for 2min by slow stirring (the rotating speed is 140r/min), stopping stirring for 15S, then stirring the mixture for 2min by fast stirring (the rotating speed is 280r/min), forming a clean slurry block with the size of 20mm multiplied by 20mm in a six-connection die, demoulding the slurry block after 3.5h, placing the slurry block into water, maintaining the slurry block at the temperature of 20 ℃ to a specified age, and testing the strength on a universal testing machine.

In the following embodiments, an eight-channel isothermal calorimeter is used for monitoring the hydration heat release process of cement, the test temperature is 30 ℃, the experimental test piece is pure slurry, common tap water is used, and the water-to-gel ratio is 0.5.

TABLE 1 Net paste Strength of composite cementitious Material

TABLE 1 Net paste Strength of composite cementitious Material

Serial number	4h	8h	12h	1d	3d	7d
							Control group	0.035	0.42	1.6475	6.86	17.511	27.494
Carrying out group M2	0.245	1.1894	5.4151	13.0566	20.027	49.903
							Implementation group M-5	0.215	0.953	5.3314	12.481	176.884	54.181
Carrying out group M-8	0.1625	0.9005	4.3474	9.4544	186.273	453.741
							Group of embodiments	0.2625	1.6028	7.6605	19.7331	22.121	634.816