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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

Inactive 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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the low water-binder ratio also brings two fatal defects to high-strength concrete: autogenous shrinkage and brittleness increase
At the same time, due to the large amount of cementitious materials in high-strength concrete, the cement hydration releases heat faster, the temperature rise is higher, and the possibility of temperature cracks is greater.
In addition, because the compactness of hardened high-strength concrete is higher than that of ordinary strength concrete, the wet curing effect of water on high-strength concrete in the external curing process is extremely weak, so the wet curing measures used for ordinary concrete are used for the self-drying and self- Shrinkage control effect is not obvious

Method used

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  • C70 mass concrete and preparation process thereof
  • C70 mass concrete and preparation process thereof
  • C70 mass concrete and preparation process thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The C70 mass concrete in this example is prepared from the following components by mass: 140 parts of water, 400 parts of P.O52.5R cement, 1000 parts of crushed stone, 550 parts of sand and gravel, and 70 parts of Class II fly ash , 60 parts of S95 mineral powder, 30 parts of silica fume, 8 parts of polycarboxylate pumping agent, 35 parts of SY-K fiber toughened concrete anti-cracking agent, 0.3 part of superabsorbent resin internal curing agent; The diameter is 10mm to 20mm.

[0031] The preparation method of the C70 mass concrete of the present embodiment may further comprise the steps:

[0032] Step 1. Mix 550 parts of gravel, 1000 parts of gravel and 140 parts of water at a temperature of 5° C. to obtain a mixture;

[0033] Step 2. Add 400 parts of P.O52.5R cement, 70 parts of Ⅱ grade fly ash, 60 parts of S95 mineral powder, 30 parts of silica fume, 8 parts of polycarboxylic acid pumping agent, 35 parts of the mixture obtained in step 1. One part of SY-K fiber tou...

Embodiment 2

[0045] The C70 mass concrete in this example is prepared from the following components by mass: 143 parts of water, 405 parts of P.O52.5R cement, 1020 parts of crushed stone, 560 parts of sand and gravel, and 74 parts of Class II fly ash , 63 parts of S95 mineral powder, 34 parts of silica fume, 8.2 parts of polycarboxylic acid pumping agent, 36 parts of SY-K fiber toughened concrete anti-cracking agent, 0.31 part of superabsorbent resin internal curing agent; The diameter is 10mm to 20mm.

[0046] The preparation method of the C70 mass concrete of the present embodiment may further comprise the steps:

[0047] Step 1. Mix 560 parts of gravel, 1020 parts of gravel and 143 parts of water at a temperature of 5° C. to obtain a mixture;

[0048] Step 2. Add 405 parts of P.O52.5R cement, 74 parts of Ⅱ grade fly ash, 63 parts of S95 mineral powder, 34 parts of silica fume, 8.2 parts of polycarboxylic acid pumping agent, 36 parts of the mixture obtained in step 1. One part of SY-K ...

Embodiment 3

[0050] The C70 mass concrete in this example is prepared from the following components by mass: 146 parts of water, 410 parts of P.O52.5R cement, 1040 parts of crushed stone, 570 parts of sand and gravel, and 78 parts of Class II fly ash , 66 parts of S95 mineral powder, 38 parts of silica fume, 8.4 parts of polycarboxylate pumping agent, 37 parts of SY-K fiber toughened concrete anti-cracking agent, 0.32 part of superabsorbent resin internal curing agent; The diameter is 10mm to 20mm.

[0051] The preparation method of the C70 mass concrete of the present embodiment may further comprise the steps:

[0052] Step 1. Mix 570 parts of gravel, 1040 parts of gravel and 146 parts of water at a temperature of 5° C. to obtain a mixture;

[0053] Step 2: Add 410 parts of P.O52.5R cement, 708 parts of grade II fly ash, 66 parts of S95 mineral powder, 38 parts of silica fume, 8.4 parts of polycarboxylic acid pumping agent, 37 parts of the mixture obtained in step 1 One part of SY-K fib...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/20
CPCC04B28/04C04B2111/20C04B2201/52C04B14/02C04B14/06C04B18/141C04B18/146C04B18/08C04B24/24C04B22/142C04B16/0633C04B2103/0068C04B2103/65C04B2103/0051
Inventor 王博董福成宋心包贵安孙朋伟穆文芳
Owner 陕西秦汉恒盛新型建材科技股份有限公司
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