Crack-resistant abrasion-resistant hydraulic concrete and preparation method thereof
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A hydraulic concrete and anti-scouring technology, which is applied in the field of hydraulic concrete to improve the performance of concrete mixtures and anti-scour performance, the effect of readily available and cheap raw materials, and low production costs
Inactive Publication Date: 2011-04-13
广西壮族自治区水利科学研究院
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[0005] The purpose of the present invention is to solve the technical problems of cracks caused by plastic shrinkage, drying shrinkage and self-volume deformatio...
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Embodiment 1
[0032] The technical solution of the present invention is trially applied to anti-scouring concrete of a water conservancy project in Guilin, Guangxi, with design grade of compressive strength C40 and anti-scouring strength ≥ 12.0h / kg / m 2 , 28d drying shrinkage value≤350×10 -6 , 28d self-generated volume deformation value ≤ 140×10 -6 , requiring no cracks after concrete pouring. The preparation method is as follows:
[0033] (1) Dry mix the cement, silica fume powder and polypropylene fiber evenly, then put the mixture and 1 / 2 water into the mixer, and stir for 35-40 seconds;
[0034] (2) Put sand, small stones, medium stones and large stones into the mixer on the basis of the completion of step (1), and stir for 45 to 50 seconds;
[0035] (3) On the basis of the completion of step (2), add internal curing agent, water reducing agent, air-entraining agent and the remaining 1 / 2 water into the mixer, and stir for 85-90 seconds;
[0036] (4) Install the concrete that has been...
Embodiment 2
[0043] The technical solution of the present invention is trially applied to anti-scouring concrete of a water conservancy project in Chuanjiang, Guilin, Guangxi. The design grade of compressive strength is C40, and the anti-scouring strength is ≥ 14.0h / kg / m 2 , 28d dry shrinkage value ≤ 300 × 10-6, 28d self-generated volume deformation value ≤ 120 × 10-6, requiring no cracks after concrete pouring. The preparation method is as follows:
[0044] (1) Dry mix the cement, silica fume and polypropylene fiber evenly, then put the mixture and 1 / 2 water into the mixer, and stir for 30-35 seconds;
[0045] (2) Put sand, small stones, medium stones and large stones into the mixer on the basis of the completion of step (1), and stir for 40 to 45 seconds;
[0046] (3) On the basis of the completion of step (2), add internal curing agent, water reducing agent, air-entraining agent and the remaining 1 / 2 water into the mixer, and stir for 80-85 seconds;
[0047] (4) Install the concrete t...
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Abstract
The invention discloses crack-resistant abrasion-resistant hydraulic concrete and a preparation method thereof. The hydraulic concrete comprises materials of cement, sand, stones, a polypropylene fiber, a water reducing agent, an air entraining agent and water, and is characterized in that: an internal curing agent and silica fume powder are added; by adopting the internal curing agent as a super absorbent resin, internal maintenance of the concrete is enhanced, the concrete shrinkage is reduced, the abrasion resistance of the concrete is improved, and the crack resistance of the concrete is improved; by adopting the silica fume powder, the concrete mixture performance and abrasion resistance are improved, the comprehensive utilization of industrial wastes and resource and energy conservation are realized, and the environment is protected; and taking concrete at C40 strength grade as an example, the abrasion resistance is 23.52h/kg/m<2>, the early plastic shrinkage crack resistance reaches the first grade, cracks are not formed on the surface of the concrete, an air shrinkage value within 28 days is 162*10<-6>, and the autogenous volume deformation within 28 days is 20*10<-6>. The technical scheme is simple in technical operation, readily available in raw materials, lower in production cost and better in economic and social benefits.
Description
Technical field: [0001] The invention belongs to the technical field of hydraulic concrete, and relates to an anti-cracking and anti-scouring hydraulic concrete and a preparation method thereof. Background technique: [0002] With the implementation of the western development strategy and the development strategy of power transmission from west to east, my country needs to build a number of large-scale high-water-head power stations. The flow velocity of the discharge structures reaches 40-50m / s, and when the water flow is entrained with suspended or displaced substances, the erosion and cavitation erosion suffered by the buildings will be even more serious. Therefore, higher requirements are put forward for the crack resistance and abrasion resistance of hydraulic concrete. Although the current hydraulic anti-scour concrete configuration technology can solve the anti-scour strength of hydraulic concrete, the cracks caused by the early plastic shrinkage, later drying shrink...
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