Impermeable concrete and preparation method thereof

Abstract

The invention relates to the technical field of concrete, and particularly discloses impermeable concrete and a preparation method thereof. The impermeable concrete comprises water, cement, fly ash, slag powder, machine-made medium sand, machine-made fine sand, stones, fibers and a composite additive, wherein the composite additive comprises an anti-cracking and anti-seepage reinforcing agent, fatty alcohol-polyoxyethylene ether ammonium sulfate and ammonium lauryl sulfate. The preparation method comprises the following steps: adding the composite additive into water, and conducting uniform mixing to obtain a water solution of the additive; mixing various aggregates, and adding 70% of the water solution of the additive for wetting; and adding the rest raw materials and the rest 30% of thewater solution of the additive. The impermeable concrete has the advantage that the impermeability of the concrete is obviously improved.

Description

technical field [0001] The application relates to the technical field of concrete, more specifically, it relates to an anti-seepage concrete and a preparation method thereof. Background technique [0002] The impermeability of concrete refers to the ability of concrete to resist the penetration of liquid and gas under pressure. During the hardening process of concrete, only a part of the water will hydrate with the cement, and the excess water will evaporate after the concrete hardens and dries, forming a large number of tiny pores. At the same time, a certain amount of air is often mixed into the concrete during the mixing and pouring process, and it is difficult to completely remove it during the tamping process. Therefore, the hardened concrete is in a porous state, including closed pores, interpenetrating capillary channels, macroscopic pores visible to the naked eye, and microscopic pores with small diameters. These pores directly affect the impermeability of concrete....

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Problems solved by technology

[0003] At present, the method to solve the water seepage of concrete mainly adopts the double mixing technology of adding expansion agent and polypropylene fiber, and increasing the amount of cementitious material to improve the concrete strength level and other measures; although this technical measure improves the crack resistance of concrete to a certain extent, the expansion It is difficult to control the expansion rate of the agent, and the maintenance environment is demanding. The impermeability of concrete is often reduced due to improper maintenance, which greatly shortens the service life of concrete buildings and greatly increases the maintenance cost of concrete buildings.

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