Anti-cracking impervious concrete

Abstract

The invention provides anti-crack impervious concrete, belonging to the technical field of building materials. The anti-crack impervious concrete comprises the following components in parts by mass: 200 to 300 parts of cement, 100 to 150 parts of coal ash, 950 to 1100 parts of gravels, 850 to 1050 parts of sand, 0.5 to 1 part of nanometer inorganic oxide, 0.5 to 1 part of nanometer zinc oxide, 6 to 12 parts of an additive, 1 to 3 parts of a self-repairing agent and 155 to 170 parts of water. According to the invention, the nanometer inorganic oxide, the nanometer zinc oxide, the additive and the self-repairing agent are used as main raw materials, the small-size effect, the surface interface effect, the self-repairing effect, the surface energy condition technology and the like of nanomaterials are used for improving and optimizing the pores and compactness of the concrete, and water is blocked through self-repairing to repair cracks; a hydration heat release rate and pore solution surface energy are reduced by inhibiting moisture evaporation of a concrete mixture in condensation and hardening, so the volume stability of the concrete is maximized; and finally, self-repairing is conducted on cracks which possibly occur. Therefore, the concrete has crack resistance and impermeability in a full-period range, and the durability and the structural safety of the concrete are improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to crack-resistant and seepage-proof concrete. Background technique [0002] With the acceleration of my country's infrastructure construction, more and more underground projects and super-large and super-long structures are involved, and the requirements for the durability of concrete are getting higher and higher, thus putting forward higher new requirements for the crack resistance and anti-seepage performance of concrete. Requirements: Concrete cracks are the most direct and important factors affecting the durability of concrete, structural safety and building service life. Solving the crack resistance of concrete and improving the impermeability of concrete will be conducive to the advancement of my country's infrastructure construction and the establishment of a good international quality brand. [0003] At present, cracks caused by plastic shrinkage, heat of hydrati...

AI Technical Summary

Problems solved by technology

[0003] At present, cracks caused by plastic shrinkage, heat of hydration, and dry shrinkage of concrete are very common. In order to prevent concrete cracks and improve impermeability, the double-mixing technology of adding expansion agent and polypropylene fiber is mainly adopted, and the amount of cementitious materials is increased. Measures such as improving the strength level of concrete; although this technical measure improves the crack resistance of concrete to a certain extent, it is difficult to control the expansion rate of the expansion agent, and the maintenance environment is demanding; the increase in the amount of cementitious materials will increase the temperature, stress concentration and chemical stress. Shrinkage and other risks are not conducive to cost control and sustainable development

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