阅读说明：本技术 一种促进硅酸盐水泥水化的调控胶凝材料 (Regulation and control cementing material for promoting hydration of portland cement ) 是由 兰明章 裴天蕊 王剑锋 郑焱 杨君健 陈智丰 崔素萍 王亚丽 于 2021-07-17 设计创作，主要内容包括：本发明提供了一种促进硅酸盐水泥水化的调控胶凝材料。本发明提供的材料水化硬化快,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：无水硫铝酸钙：27～68份、石膏：29～68份、亚硝酸锂：2～5份、乙二醇单异丙醇胺：0.14～0.29份、三乙醇胺乙酸酯：0.04～0.09份、聚合甘油：0.04～0.09份。本发明通过无水硫铝酸钙、石膏、熟料矿物的协同水化反应、早强剂的强化增溶作用,加快各熟料矿物的溶解与水化,进而提高硅酸盐水泥的早期强度。(The invention provides a regulating and controlling cementing material for promoting the hydration of portland cement. The cement-based composite cementing material provided by the invention is quick in hydration and hardening and excellent in early strength. The composite cementing material comprises the following raw materials in parts by mass: anhydrous calcium sulfoaluminate: 27-68 parts of gypsum: 29-68 parts of lithium nitrite: 2-5 parts of ethylene glycol monoisopropanolamine: 0.14-0.29 parts of triethanolamine acetate: 0.04-0.09 part of polyglycerol: 0.04 to 0.09 portion. The invention accelerates the dissolution and hydration of each clinker mineral through the synergistic hydration reaction of the anhydrous calcium sulphoaluminate, the gypsum and the clinker mineral and the enhanced solubilization of the early strength agent, thereby improving the early strength of the portland cement.)

1. A regulating and controlling cementing material for promoting mineral hydration of silicate clinker, which is characterized in that the weight ratio of anhydrous calcium sulphoaluminate: 27-68 parts of gypsum: 29-68 parts of lithium nitrite: 2-5 parts of ethylene glycol monoisopropanolamine: 0.14-0.29 parts of triethanolamine acetate: 0.04-0.09 part of polyglycerol: 0.04 to 0.09 portion. The total parts of the gelled materials are regulated to be 100 parts.

2. The process according to claim 1, characterized in that the preparation of the anhydrous calcium sulfoaluminate monoore: calcium carbonate, aluminum oxide and calcium sulfate powder are mixed according to CaCO₃：Al₂O₃：The anhydrous calcium sulphoaluminate powder which accounts for 5 percent of the weight of the mixed powder is added into the mixed powder to be used as a seed crystal, the mixture is uniformly mixed, compacted and calcined, the temperature is raised to 1350 ℃ within 2 hours, the mixture is kept warm for 2 hours, the mixture is cooled to room temperature within 1min, and the mixture is ground until the mixture is sieved by a 200-mesh sieve, and the purity is more than 97.5 percent.

3. The method of claim 1, wherein the gypsum is anhydrite which is maintained at 200 ℃ for 2 hours in a high temperature furnace.

4. The process according to claim 1, characterized in that the anhydrous calcium sulfoaluminate/gypsum molar ratio is 11.

5. Use of the conditioned cementitious material prepared according to the method of claim 1 for promoting the hydration of portland cement clinker, wherein the amount added is 10% by weight of portland cement.

Technical Field

The invention relates to the field of building materials, in particular to a regulation and control cementing material for promoting mineral hydration of silicate clinker.

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 is required to reach the standard as soon as possible. The existing precast element curing steam curing method can cause the problems of service safety and service life of the element, so the invention provides a regulating and controlling cementing material for promoting the rapid hydration of portland cement for the precast element at normal temperature aiming at the problems in the prior art.

The early strength agent is a common method for improving the early strength of the cementing material and mainly comprises an inorganic salt early strength agent, an organic matter early strength agent and a composite early strength agent. The problems of the prior early strength agents are that the strength promoting effect is limited, especially the ultra-early strength is slightly improved, and the early strength agents have adaptability to different cementing materials.

In addition, early strength minerals are used as mineral admixtures, and experiments show that the hydration rate of the anhydrous calcium sulphoaluminate is very high, the anhydrous calcium sulphoaluminate and gypsum consume calcium hydroxide during hydration, the hydration of silicate minerals can be promoted, but the early strength of the silicate cement is limited by the anhydrous calcium sulphoaluminate and the gypsum. The early strength mineral and the early strength agent are mixed according to the components, so that the early strength of the portland cement can be further improved, and the later strength is also greatly improved; but also can achieve good enhancement effect under the condition of extremely low mixing amount.

Disclosure of Invention

The invention aims to solve the technical problem of inventing a regulating and controlling cementing material for promoting the hydration of portland cement.

In order to solve the technical problems, the invention provides a regulation and control cementing material consisting of inorganic minerals, inorganic salts and organic matters, which comprises the following components in percentage by weight:

anhydrous calcium sulfoaluminate: 27 to 68 parts by weight of

Gypsum: 29 to 68 parts by weight of

Lithium nitrite: 2-5 parts of

Ethylene glycol monoisopropanolamine: 0.14 to 0.29 portion

Triethanolamine acetate: 0.05 to 0.09 portion

Polymerized glycerin: 0.05 to 0.09 portion

The total mass is preferably 100 parts.

The purity of the above-mentioned preferred anhydrous calcium sulphoaluminate is more than 97.5%; the gypsum is obtained by keeping the temperature of anhydrite for 2 hours at 200 ℃ in a high-temperature furnace.

More preferably, the molar ratio of anhydrous calcium sulfoaluminate to gypsum is 11, i.e., the amount of the anhydrous calcium sulfoaluminate is about 16 parts, and the amount of the gypsum is 66 parts.

The preferred average molecular weight of the polyglycerol is 200 to 500.

A further preferred polyglycerol is triglycerol.

The preparation method of the regulating and controlling cementing material for the prefabricated part comprises the following steps:

step 1: preparing anhydrous calcium sulphoaluminate monoore: calcium carbonate, aluminum oxide and calcium sulfate powder are mixed according to the proportionThe anhydrous calcium sulphoaluminate powder which accounts for 5 percent of the mass of the mixed powder is added into the mixed powder to be used as a seed crystal, the mixture is uniformly mixed, compacted and calcined, the temperature is raised to 1350 ℃ within 2 hours, the mixture is taken out after the temperature is kept for 2 hours, the mixture is cooled to the room temperature within 1min and is ground until the mixture is sieved by a 200-mesh sieve.

Step 2: preparation of calcined gypsum: the anhydrite is kept at a temperature of 200 ℃ for 2 hours.

And step 3: the gypsum/anhydrous calcium sulfoaluminate molar ratio is controlled.

And 4, step 4: ethylene glycol monoisopropanolamine, triethanolamine acetate and polyglycerol are respectively added into a mixture of gypsum and anhydrous calcium sulphoaluminate, and the mixture is fully ground.

The application of the regulated and controlled cementing material in promoting the hydration of the Portland cement is characterized in that the adding amount is 10 percent of the weight of the Portland cement.

Due to the adoption of the technical scheme, the invention achieves the following technical effects:

the invention is used forThe controlled cementing material for promoting the hydration of silicate cement clinker minerals, wherein, the anhydrite is heated to 200 ℃, the dissolution rate is fastest, and the inorganic mineral components in the controlled cementing material consume C while providing strength by self hydration₃S and C₂The calcium hydroxide hydrolyzed from S promotes the silicate minerals to be further hydrated, the organic early strength agent accelerates the dissolution of the minerals in an alkaline environment, the heat release rate of early hydration is greatly increased, the hydration is accelerated, the early strength is high, and the 7d compressive strength lifting rate can reach 53.34%.

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.

Preparing anhydrous calcium sulphoaluminate monoore: calcium carbonate, aluminum oxide and calcium sulfate powder are mixed according to the proportionThe anhydrous calcium sulphoaluminate powder which accounts for 5 percent of the mass of the mixed powder is added into the mixed powder to be used as a seed crystal, the mixture is uniformly mixed, compacted and calcined, the temperature is raised to 1350 ℃ within 2 hours, the mixture is taken out after the temperature is kept for 2 hours, the mixture is cooled to the room temperature within 1min and is ground until the mixture is sieved by a 200-mesh sieve.

Preparation of calcined gypsum: the anhydrite is kept at a temperature of 200 ℃ for 2 hours.

The various examples regulate the amount of cementitious material as follows:

example 1

A regulation and control cementing material for promoting rapid hydration of portland cement consists of the following components in parts by weight: 67.02 parts of anhydrous calcium sulphoaluminate, 29.83 parts of gypsum, 2.91 parts of lithium nitrite, 0.14 part of ethylene glycol monoisopropanolamine, 0.05 part of triethanolamine acetate and 0.05 part of polyglycerol. The total is 100 parts.

Example 2

A regulation and control cementing material for promoting rapid hydration of portland cement consists of the following components in parts by weight: 45.70 parts of anhydrous calcium sulphoaluminate, 50.92 parts of gypsum, 2.91 parts of lithium nitrite, 0.29 part of ethylene glycol monoisopropanolamine, 0.09 part of triethanolamine acetate and 0.09 part of polyglycerol. The total is 100 parts.

Example 3

A regulation and control cementing material for promoting rapid hydration of portland cement consists of the following components in parts by weight: 34.06 parts of anhydrous calcium sulphoaluminate, 60.82 parts of gypsum, 4.75 parts of lithium nitrite, 0.19 part of ethylene glycol monoisopropanolamine, 0.09 part of triethanolamine acetate and 0.09 part of polyglycerol. The total is 100 parts.

Example 4

A regulation and control cementing material for promoting rapid hydration of portland cement consists of the following components in parts by weight: 27.49 parts of anhydrous calcium sulphoaluminate, 67.30 parts of gypsum, 4.74 parts of lithium nitrite, 0.29 part of ethylene glycol monoisopropanolamine, 0.09 part of triethanolamine acetate and 0.09 part of polyglycerol. The total is 100 parts.

The addition amount of the binding material is regulated to be 10 percent of the weight of the Portland cement. According to the raw material ratio, the dry powder raw materials in the embodiment are uniformly mixed and placed in a mortar stirring pot. Taking one part of cementing material and three parts of China ISO standard sand by mass, preparing cement mortar into a 40mm x 160mm prism test body by using a group of plastic glue sand mixed with a water cement ratio of 0.5, placing the cement mortar into water, curing the cement mortar to a specified age at the temperature of 20 ℃, and carrying out strength test on a universal tester. The tests were carried out according to the test methods specified in GB/T17671-1999 method for testing the strength of cementitious grits (ISO).

The dry powder raw materials are uniformly mixed according to the preset proportion in the embodiment, the mixture is placed in a clean slurry stirring pot, the water cement ratio is determined to be 0.35, the mixture is stirred for 2min by slow stirring (the rotating speed is 140r/min), the stirring is stopped for 15s, then the mixture is stirred for 2min by fast stirring (the rotating speed is 280r/min), the mixture is formed into a clean slurry block with the size of 20mm multiplied by 20mm in a six-connection die, the clean slurry block is placed in water and maintained at the temperature of 20 ℃ to the specified age, and the strength test is carried out on a universal tester.

TABLE 1 mortar flexural Strength test results

TABLE 2 mortar compression Strength test results

TABLE 3 Net paste compression Strength test results