C70 mass concrete and preparation process thereof

A large-volume concrete and cement technology, applied in the field of concrete, can solve the problems of high-strength concrete self-drying, self-shrinkage control effect is not obvious, self-shrinkage and brittleness increase, wet curing effect is weak, etc., to improve workability and pumping Performance, reduce water loss, improve the effect of sulfate attack and chloride dialysis
CN110467407AInactive Publication Date: 2019-11-19陕西秦汉恒盛新型建材科技股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
陕西秦汉恒盛新型建材科技股份有限公司
Publication Date
2019-11-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses C70 mass concrete. The C70 mass concrete is prepared from the following components by mass: 140 to 170 parts of water, 400 to 450 parts of cement, 1,000 to 1,200 parts of crushed stone, 550 to 650 parts of gravel, 70 to 110 parts of coal ash, 60 to 90 parts of mineral powder, 30 to 70 parts of silica fume, 8 to 10 parts of a pumping agent, 35 to 45 parts of an anti-crackingagent, and 0.3 to 0.4 part of an internal curing agent. The invention also discloses a preparation method for the C70 mass concrete. The method comprises a first step of uniformly mixing sand, graveland water and a second step of adding other components and carrying out uniform mixing under stirring. According to the composition of the mass concrete in the invention, mineral powder, silica fumeand fly ash are used as mineral admixtures and can delay the release rate of cement hydration heat and reduce the shrinkage and deformation of the concrete, and the mineral admixtures acts synergistically with the other components to inhibit the generation of cracks at the same time; and the preparation method of the invention is simple in process and easy to implement.
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Description

technical field

[0001] The invention belongs to the technical field of concrete, and in particular relates to a C70 large-volume concrete and a preparation process thereof. Background technique

[0002] For high-strength concrete, the more common design idea in the world is: adopt the technical route of "cement + ultra-fine mineral admixture + high-efficiency water reducer + aggregate" for mix ratio design. The design idea is to reduce the water-binder ratio by adding high-efficiency water reducing agent; by adding highly active ultra-fine mineral admixtures to increase the amount of gelling substances in the cement stone after concrete hardening and improve the strength of concrete; through strict Controlling the particle size, particle shape and particle size distribution of the aggregate increases the strength of the concrete, improves the durability fundamentally, and fully guarantees the fluidity of the concrete mixture. However, the low water-binder ratio also brings ...

Claims

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