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Functional admixture for improving durability of concrete and cement products and preparation method of functional admixture

A cement product and durability technology, applied in the field of preparation of functional admixtures, can solve the problems of increased fluctuations in the antifreeze performance of concrete and cement products, difficult control of diameter, and impact on the service life of concrete and cement products, etc., to achieve Improve the degree of compactness and volume stability, improve durability, and prevent volume shrinkage

Inactive Publication Date: 2015-01-28
JILIN JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, antifreeze concrete often needs to be mixed with air-entraining agent, but the amount of gas formed by air-entraining agent in concrete and the diameter of bubbles are not easy to control, such as the temperature when air-entraining agent is mixed, mixing time, and the type of mineral admixture ( Such as whether fly ash is mixed or not) and other factors will affect the air content and bubble diameter of concrete and cement products, which will increase the fluctuation range of antifreeze performance of concrete and cement products, and then affect the service life of concrete and cement products
[0006] Alkali carbonate reaction was discovered in the early 1950s. Scholars from various countries have published many articles on the mechanism of alkali carbonate reaction, but the main attention is on how to use carbonate rock as aggregate to suffer from alkali aggregate reaction. In the prevention of destruction, the application of the natural law of alkali carbonate reaction to turn harm into benefit has not been reported.

Method used

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  • Functional admixture for improving durability of concrete and cement products and preparation method of functional admixture
  • Functional admixture for improving durability of concrete and cement products and preparation method of functional admixture
  • Functional admixture for improving durability of concrete and cement products and preparation method of functional admixture

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preparation example Construction

[0044] The preparation method of the functional admixture to improve the durability of concrete and cement products includes the following steps:

[0045] a. Grind the volume expansion carbonate rock with alkali aggregate reaction into cement fineness;

[0046] b. According to 97.0%-99.8% of carbonate rock powder and 0.2%-3.0% of activator, after mixing uniformly, it is made into a functional admixture of high durability concrete or cement products;

[0047] c. Durable functional admixture is added 2%-22% according to the mass of general Portland cement to prepare high-durability concrete or cement products.

[0048] The durable functional admixture is compounded with fly ash and slag powder to prepare the durable functional composite admixture. The mass percentage of the durable functional composite admixture:

[0049] Durable functional admixture 10%-40%

[0050] Fly ash, slag powder 60%-90%

[0051] Mix uniformly to make a functional composite admixture that improves the durability of ...

Embodiment 1

[0052] Example 1 Waterproof and anti-crack plastering mortar

[0053] Waterproof and anti-crack plastering mortar: The waterproof and anti-cracking plastering mortar is composed of PC 32.5 cement: medium sand=1:3, mixed with a durable functional admixture (dolomitic micrite limestone powder 99.7% and 0.3% sodium sulfate). Specifically: cement 370kg, medium sand 1350kg, durability function admixture 37kg and appropriate amount of water.

[0054] A pool with a capacity of about 0.75 cubic meters of water was built with red bricks. After 20 days of plastering with waterproof and crack-resistant plastering mortar, no cracks were seen in the waterproof and crack-resistant plastering mortar, and no leakage occurred when the water was filled for a long time.

Embodiment 2

[0055] Example 2 Waterproof and anti-crack plastering mortar

[0056] The waterproof and anti-cracking plaster mortar is composed of PC 32.5 cement: medium sand = 1:3, mixed with a durable functional admixture (Dolomite powder 99.8% and 0.2% sodium sulfate) that accounts for 10% of the weight of the cement, specifically: Cement is 370kg, medium sand is 1350kg, durable functional admixture is 37kg and appropriate amount of water.

[0057] On the red brick wall with clear water, use waterproof and anti-cracking plastering mortar to plaster three squares of 1 square meter. Seven days later, no cracks were found on the plastered surface of the mortar. Also on the red brick clean water wall, ordinary plastering mortar without durability function admixture is composed of PC 32.5 cement: medium sand=1:3, specifically: cement 370kg, medium sand 1350kg and appropriate amount of water. Use the contrast plastering mortar to plaster three pieces of 1 square meter in size. After 7 days, you ca...

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Abstract

The invention relates to functional admixture for improving durability of concrete and cement products. The admixture is prepared by mixing a certain number of volume expansion carbonatite powder with alkali-aggregate reaction and an activator, namely grinding the volume expansion carbonatite powder with alkali-aggregate reaction into cement fineness, uniformly stirring with alkali-containing salt, and doping according to the mass of portland cement when the concrete and cement products are prepared. Tests prove that the functional admixture has the effects of reducing volume shrinkage of the concrete and cement products, reducing production cost of the concrete and cement products, effectively improving the compact degree and volume stability of the concrete and cement products, remarkably improving the durable performance of the concrete and cement products, improving the freeze thawing resistance, permeation resistance, carbonization resistance and other durable performances of the concrete and cement products, and prolonging the service lives of the concrete and cement products.

Description

Technical field: [0001] The invention relates to a method for preparing a functional admixture that improves the durability of concrete and cement products. Background technique: [0002] As we all know, during the hydration and hardening process of Portland cement, due to the characteristics of its clinker minerals, hardened concrete and cement products will produce a certain amount of volume shrinkage, which has an adverse effect on the service life of concrete and cement products. , Is the main reason for the decrease in durability of concrete and cement products, including volume shrinkage formed by drying and dehydration, and auto-shrinkage caused by chemical shrinkage of cement and self-drying. The so-called chemical shrinkage refers to the volume of CSH gel, the main product of cement hydration reaction. It is less than the sum of the volume of cement and water before hydration. The so-called self-drying means that the amount of free water in the micropores in the interna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B14/26C04B28/04C04B18/30
CPCY02W30/91
Inventor 阮炯正
Owner JILIN JIANZHU UNIVERSITY
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