Concrete moisture evaporation inhibitor and preparation method and application thereof

Abstract

The invention discloses a concrete moisture evaporation inhibitor and a preparation method and application thereof. The concrete moisture evaporation inhibitor is prepared by taking unsaturated acid, unsaturated amide and unsaturated ester as main raw materials and is polymerized by adopting a water solution free radical method with mass ratio of 1:(1-2.5):(0.0-0.1). A moisture evaporation inhibitor solution is introduced into the concrete by an external spraying or internal doping mode, evaporation of surface moisture at the plastic state of the concrete can be obviously inhibited, plastic cracking of the concrete is greatly reduced, and the concrete moisture evaporation inhibitor and the preparation method and application thereof have the advantages of being simple in process, green and environment friendly, convenient in use and good in anti-cracking effect.

Description

technical field [0001] The invention belongs to the field of concrete, and relates to a concrete water evaporation inhibitor, a preparation method and application thereof. Background technique [0002] Cast-in-place concrete usually needs to be cured in time during the plastic stage, otherwise plastic shrinkage cracks will easily appear. This is mainly because the free water in the concrete slurry will evaporate to the surface. With the increase of water loss, the stress generated by capillary negative pressure makes the concrete surface Volume shrinkage occurs, and surface cracks appear, especially in high temperature weather. Severe cracking will cause huge economic losses and hidden dangers to building safety. Therefore, controlling the evaporation of water in the plastic stage of concrete and reducing plastic cracking are of great significance to ensure the safety of concrete structures. [0003] There are many ways to suppress the evaporation of concrete moisture, such...

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Problems solved by technology

Among them, grass cover and plastic film are the most common methods, which are usually suitable for horizontal building structures, such as building floors, concrete bridge decks and road surfaces, etc., but for facade walls or other irregular structures, this method cannot Very good application; moreover, due to the cooperation of many people in the construction method, a large amount of waste will be generated, so there are disadvantages of troublesome construction, time-consuming and labor-intensive

The water evaporation inhibitor products with water glass as the main component overcome the above shortcomings to a certain extent by spraying or brushing, but because of their poor film-forming properties on the surface, the 1h water evaporation inhibition rate is only 20%. ~30%

The water evaporation inhibitor products with paraffin wax emulsion as the main component generally require a higher dosage when achieving a higher water evaporation inhibition rate. At this time, the paraffin wax forms a solid hydrophobic layer on the concrete surface, which is not easy to remove, thus affecting post-concrete construction

[0004] Patent CN105503019A discloses a preparation method of coagulation water evaporation inhibitor, which method is to configure long-chain alcohol, emulsifier, water and optional thickener, defoamer and other components, and then long-chain alcohol, emulsified Mixing agent and pre-emulsification with water, high-speed shear emulsification in the state of complete melting of long-chain alcohol, and finally adding the remaining water quickly, the obtained concrete moisture evaporation inhibitor can effectively solve the plasticity of concrete caused by water loss under high heat and high wind conditions However, the preparation process of the water evaporation inhibitor needs to be completed in multiple steps, and it needs to be produced under high temperature conditions of 50-100 °C

Similar to this, patent CN101805145B reports a plastic coagulation water evaporation inhibitor and its preparation method. It is made by mixing amphiphilic compounds, surfactants, thickeners and co-emulsifiers. The product can reduce the plasticity of concrete. In the early stage of the state, the surface water evaporates, but it also needs to be produced at 50-80°C, the temperature is higher, and the energy consumption is larger

Patent CN102731016A has invented a coagulation water evaporation inhibitor and its preparation method, which is made by mixing fatty alcohol, fatty alcohol polyoxyethylene ether, sodium alkylsulfonate and organic solvents such as methanol, ethanol or ethylene glycol. The use of organic solvents can promote the dissolution of raw materials, greatly reduce the amount of surfactants and emulsifiers, and can also reduce the evaporation of water on the surface of concrete in the plastic stage. However, this product is also produced at 50-80 ° C, and it is also used Toxic and volatile organic solvents, poor environmental protection, not conducive to production and application

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