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Hydraulic large-volume crack-resistant concrete and preparation method thereof

A large-volume, concrete technology, applied in the field of concrete materials, can solve the problems of insufficient crack resistance of shrinkage-compensated concrete, and achieve the effects of reducing cracks, improving crack resistance, and increasing splitting strength

Pending Publication Date: 2019-11-05
ZHENGZHOU UNIV
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Problems solved by technology

[0012] The technical problem to be solved by the present invention is to provide a large-volume anti-crack concrete for hydraulic engineering and its preparation method to solve the problem of insufficient crack resistance of existing shrinkage-compensating concrete

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  • Hydraulic large-volume crack-resistant concrete and preparation method thereof
  • Hydraulic large-volume crack-resistant concrete and preparation method thereof
  • Hydraulic large-volume crack-resistant concrete and preparation method thereof

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Embodiment Construction

[0031] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0032] This embodiment provides a large-volume anti-crack concrete for hydraulic engineering, the components of the large-volume anti-crack concrete for hydraulic engineering include: cement, fly ash, expansion agent, water, sand, gravel, and water reducing agent; Among them, the mass ratio of each component is: cement 5-10%, fly ash 2-4%, expansion agent 1-2%, water 5-10%, sand 28-32%, gravel 50-55%, The water reducing agent is 0.05-0.1%, and the sum of the mass percentages of each component satisfies 100%.

[0033] Wherein, the cement is 42.5 grade ordinary Portland cement; the fly ash is F class I grade fly ash; the expansion agent includes UEA expansion agent and MgO expansion agent; the sand is inactive natural river sand , the fineness modulus is ...

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Abstract

The invention provides a hydraulic large-volume crack-resistant concrete and a preparation method thereof. The hydraulic large-volume crack-resistant concrete is prepared from, by mass, 5-10% of cement, 2-4% of fly ash, 1-2% of an expansion agent, 5-10% of water, 28-32% of sand, 50-55% of detritus and 0.05-0.15 of a water reducer. The compressive resistance and splitting tensile strength of the hydraulic large-volume crack-resistant concrete are remarkably improved compared with compensation shrinkage concrete made of a traditional U-shaped expansion agent, and the crack resistance is remarkably enhanced.

Description

technical field [0001] The invention relates to the technical field of concrete materials, in particular to a large-volume anti-crack concrete for hydraulic engineering and a preparation method thereof. Background technique [0002] The practice of large-volume hydraulic structural engineering at home and abroad shows that hydraulic large-volume concrete often produces cracks due to various reasons during the maintenance process and before and after the reservoir is impounded. The main reason for the cracking is that the concrete will shrink after pouring. The shrinkage and deformation factors of concrete are different, and the shrinkage and deformation of concrete can be divided into: plastic shrinkage, drying shrinkage, temperature shrinkage and autogenous shrinkage. [0003] Drying shrinkage: The volume shrinkage of concrete due to the loss of water in unsaturated air after the curing is stopped. Concrete takes longer to dry and shrink. The dry shrinkage deformation of ...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B18/08C04B22/066C04B22/142C04B14/068C04B14/02C04B2103/302
Inventor 郭进军张世伟苏社教郭廷
Owner ZHENGZHOU UNIV
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