Anti-crack anti-seepage self-repairing C35 mass concrete

Abstract

The invention relates to anti-cracking anti-seepage self-repairing C35 mass concrete. The mass concrete is prepared from the following ingredients in parts by mass: 200 to 290 parts of cement, 0 to 50 parts of mineral powder, 30 to 100 parts of coal ash, 0.1 to 0.3 part of an air entraining agent, 700 to 850 parts of fine aggregate, 1000 to 1100 parts of coarse aggregate, 155 to 175 parts of water, 4 to 10 parts of a retarding type water reducing agent, 25 to 35 parts of an anti-cracking agent and 5 to 10 parts of silicone-modified SAP particles. The C35 mass concrete has the beneficial effects that the C35 mass concrete has continuous micro-expansibility and internal curing performance on the basis of having conventional performance such as workability, mechanical property, impermeability and freeze-thaw resistance of concrete, and has the crack self-repairing performance and the function of preventing continuous expansion of cracks while improving the anti-cracking and anti-seepage performance of the concrete.

Description

technical field [0001] The invention relates to the field of concrete, in particular to an anti-crack and anti-seepage self-repairing C35 large-volume concrete. Background technique [0002] Concrete is the most widely used building material. At present, concrete is developing in the direction of low water-cement ratio, early strength, high adhesive materials, and high admixtures. The fineness of cement generally increases, and the strength and heat of hydration advance. Natural fine aggregate resources are tight, and a large amount of machine-made sand, ultra-fine sand, sea sand and tailing sand are pouring into the market, with poor gradation, high mud (powder) content and many harmful elements. In addition, with the increase in the amount of slag powder, The drying shrinkage of concrete is also large. Although fly ash can reduce the heat of hydration and shrinkage, most areas are in short supply of fly ash resources, and the phenomenon of shoddy goods is common, which lea...

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Problems solved by technology

[0002] Concrete is the most widely used building material. At present, concrete is developing in the direction of low water-cement ratio, early strength, high adhesive materials, and high admixtures. The fineness of cement generally increases, and the strength and heat of hydration advance. Natural fine aggregate resources are tight, and a large amount of machine-made sand, ultra-fine sand, sea sand and tailing sand are pouring into the market, with poor gradation, high mud (powder) content and many harmful elements. In addition, with the increase in the amount of slag powder, The drying shrinkage of concrete is also large. Although fly ash can reduce the heat of hydration and shrinkage, most areas are in short supply of fly ash resources, and the phenomenon of shoddy goods is common, which leads to the poor volume stability of concrete at this stage. An important factor in the difficulty of cracking

[0003] According to statistics, 80% of the leakage is caused by shrinkage, deformation and cracking of concrete itself. The remarkable characteristics of concrete structure are high brittleness and low tensile strength. The process of concrete from plastic mixture to hardening is accompanied by shrinkage and deformation of various factors. After the concrete is hardened, it is restrained by the steel bars and the foundation to produce tensile stress. When the tensile stress exceeds the tensile strength of the concrete, micro-cracks will be generated. With the growth of age and various coupling effects, it will gradually develop into penetrating harmful cracks. Various harmful ions Infiltrating into cracks and then corroding the steel bars, resulting in damage to the concrete structure and affecting the life of the structure

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