Anti-cracking reinforced ecological cement

Abstract

The anticracking high strength ecological cement is produced with Portland clinker 35-80 wt%, fly ash 5-30 wt%, ferroalloy slag 1.0-30 wt%, boiler slag 5-40 wt%, gangue 10-40 wt%, grinding aid 0.1-2.0 wt%, gypsum 0.5-10 wt%, reinforcing fibrous inorganic mineral material 1-20 wt% and polymer fiber 0.01-10 wt%, and through grinding and mixing. Compared with available technology, the anticracking high strength ecological cement of the present invention has the advantages of low hydration heat, low shrinkage, low water demand, high early strength, etc.

Description

Technical field [0001] The invention relates to the field of building materials, in particular to an anti-cracking reinforced ecological cement. Background technique [0002] Although traditional Portland cement has very high compressive strength, it has defects such as too fast hydration speed, high hydration heat, low tensile strength, large shrinkage, poor crack resistance and high brittleness. It directly Affect the performance of concrete and the quality of cast components. At the same time, due to the high heat of hydration, large water demand, and large plastic shrinkage rate, it will cause early cracks in concrete projects, and the early cracks will increase and expand over time, which seriously affects the performance and durability of concrete projects. . The main methods and technologies to solve this problem are: The first is to mix an appropriate amount of expansive agent to produce expansive crystalline hydrate through hydration reaction, and produce appropriate exp...

AI Technical Summary

Problems solved by technology

However, this method has: 1. The reliability is poor, the environment and other factors are greatly affected, and it can only be used under the condition of sufficient external water curing; 2. The tolerance of the dosage is small, and the mixing uniformity is high; 3. It is mixed with other concrete. Poor agent compatibility

The second is to reduce the heat of hydration by adding mineral admixtures to achieve low shrinkage, low heat of hydration and crack resistance. However, practice has proved that low Shrinkage, low heat of hydration cement or concrete can not improve its brittleness, and there are generally disadvantages such as large water demand, easy water separation, low early strength, etc.

The third is to use a retarder to improve its anti-crack performance by delaying the hydration rate of cement and staggering the peak period of the heat of hydration temperature rise. However, the retarder cannot inhibit the cracking caused by plastic shrinkage. When the retarder effect fails, It will speed up the hydration speed of cement, which is very easy to cause cracking, and when the dosage is improper, it is easy to appear invalid or not condensed for a long time

However, simply adding high-strength and high-modulus fibers and high-molecular polymers to ordinary cement has improved the crack resistance of cement and concrete, but it has not completely reduced the temperature rise of the heat of hydration to the concrete. From the perspective of cost and economy, polymers are expensive and obviously not suitable for mass concrete construction

Therefore, the above-mentioned technical methods are still limited in practical application to improve the crack resistance of cement components and concrete structures.

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