Water-conservancy-project high-water-head tunnel spillway bottom plate concrete crack defect inhibitor and preparation method thereof

Abstract

The invention discloses a water-conservancy-project high-water-head tunnel spillway bottom plate concrete crack defect inhibitor and a preparation method thereof. The inhibitor comprises, by weight percentage, 0.0-1.0% of plastic expanding agent special for cement-based grouting material, 0.03-0.05% of water repellent, 45.0-50.0% of waterproof expanding agent, 49.0-54.8% of high-quality mineral admixture. The inhibitor is prepared by evenly mixing the materials above in a high-speed stirrer. The prepared inhibitor is capable of effectively preventing concrete plastic settling micro-crack defects, capable of blocking capillary pore channels, capable of increasing the early tensile stress of concrete, capable of improving the structural compactness, uniformity and surface smoothness of the concrete, capable of reducing crack defects caused by uneven temperature stress and surface impact and abrasion, capable of increasing the impact and abrasion resisting strength of the water-conservancy-project high-water-head tunnel spillway bottom plate concrete by 50%, and capable of reducing surface cracks and penetrating cracks by more than 70%.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a concrete crack defect inhibitor prepared by a conventional process, in particular to an admixture for inhibiting crack generation developed for the floor concrete of a flood discharge tunnel with a high hydraulic head. Background technique [0002] The generation and development of concrete cracks is a complex process of change. The reasons for the occurrence and development of concrete cracks in different grades and construction conditions are different. It is necessary to develop a series of materials for different types of concrete to suppress the source of crack defects, so as to avoid it may cause concrete damage. subsequent hazards. [0003] As a renewable clean energy, hydropower occupies an important position in the history of energy development in my country and is one of the important driving forces for the sustainable development of the national economy. It ...

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Problems solved by technology

[0007] The technical key of the present invention is to suppress the plastic settlement of the concrete stage of the floor of the flood discharge tunnel with high water head, increase the early tensile stress of the high-grade silica fume concrete, improve the compactness, uniformity and surface finish of the concrete structure, and reduce the uneven temperature stress and surface impact. Grinding the generation and development of micro-crack defects, improving the durability of concrete

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