Composite concrete water evaporation inhibitor and application method thereof

Abstract

The invention discloses a composite concrete water evaporation inhibitor. The composite concrete water evaporation inhibitor is characterized in that the composite concrete water evaporation inhibitor comprises one or more hydrophobic cationic compounds according to any proportion and one or more hydrophobic anionic compounds according to any proportion, wherein the hydrophobic cationic compounds and the hydrophobic anionic compounds form a dense protective film by electrostatic gravitational interaction, and the molar ratio of the hydrophobic cationic compounds to the hydrophobic anionic compounds is 1: (10-0.1). When the composite concrete water evaporation inhibitor is applied, the composite concrete water evaporation inhibitor is prepared into a single-phase solution or an emulsion to be sprayed on the surface of plastic concrete, so that the water retention of the concrete water evaporation inhibitor is significantly improved, the water evaporation of concrete in a plastic state is further inhibited, and the resistance to high temperature and the resistance to wind of the concrete water evaporation inhibitor are simultaneously improved.

Description

technical field [0001] The invention relates to the field of concrete, in particular to a composite concrete moisture evaporation inhibitor and an application method thereof. Background technique [0002] Concrete curing is an important part of concrete construction. At present, the conventional curing of concrete generally starts after the concrete surface has set. However, if it is not prevented, the rapid loss of water in fresh concrete can cause cracking. The most common situation is the rapid evaporation of water on the surface, resulting in plastic shrinkage cracks in the concrete. Generally, when the evaporation rate of water on the concrete surface exceeds 1.0kg m -2 h -1 protection measures are required. Some concretes, especially those containing pozzolans or air-entrained concrete, may develop plastic shrinkage cracks at lower evaporation rates due to reduced precipitation rates. In addition to plastic shrinkage cracks, rapid evaporation can lead to crusting a...

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Problems solved by technology

The water glass type curing agent mainly reacts sodium silicate with calcium hydroxide in the cement slurry to form insoluble calcium silicate precipitation, thereby inhibiting the evaporation of water, but the uneven distribution of calcium silicate gel on the concrete surface makes its water retention rate not tall

When the paraffin-type water-retaining water agent reaches a higher water retention rate, a higher concentration is generally required. At this time, the paraffin wax forms a solid hydrophobic layer on the concrete surface, which is not easy to clean, thus affecting the later construction of the concrete.

Curing agents such as polymer emulsions also have problems such as slow film formation, negative impact on the strength of concrete in the later stage, and difficulty in cleaning after film formation.

Amphiphilic fatty alcohol emulsion can effectively inhibit water evaporation by forming an insoluble molecular film on the surface of the slurry. At the same time, the amphiphilic small molecule acts on the concrete surface without any treatment and does not affect the later construction. However, the problem with fatty alcohols is that they form The strength of the molecular film is not high, especially in high temperature environment, the pure fatty alcohol insoluble molecular film is easy to expand and affect its water retention, and the fatty alcohol insoluble molecular film also lacks wind resistance

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