Preparation method of protection and repair system for surface of concrete base

Abstract

The invention provides a preparation method of a protection and repair system for the surface of a concrete base, convenient construction is achieved, and a systematic concrete protection and repair system with high adhesive force and durability is provided. The preparation method comprises the steps that the protection and repair system comprises a primer layer, polyurethane mortar layer and a polyurethane weather-proof finish paint layer, wherein the primer layer, the polyurethane mortar layer and the polyurethane weather-proof finish paint layer cover the surface of the concrete base from inside to outside, and the primer layer is obtained by solidifying monoisocyanate-terminated polyurethane prepolymers and a catalyst; the preparation method of the primer layer comprises the steps thatpolyester polyols and first isocyanates are subjected to a thermostatic reaction for 2-3h, a first part of dihydromethyl propionic acid is added to continue the thermostatic reaction for 1.5-2.5h, when the content of isocyanato reaches 16%-23%, cooling is carried out, the catalyst is added, and discharging can be carried out after stirring for 15-20 minutes and standing; and the polyester polyolsare linear or branched polyester polyols, and the mass ratio of the first isocyanate to the polyester polyols is (2.2-4.6) : 1.

Description

technical field [0001] The invention relates to a preparation method of a protection and repair system for the surface of a concrete base. Background technique [0002] The common diseases of concrete mainly include carbonation of concrete components, corrosion of internal steel bars, salt freezing, denudation and cracks, etc. The further infiltration of corrosive media (such as chloride ions, etc.) from the diseased parts will accelerate the corrosion and volume expansion of steel bars, thereby reducing the strength of concrete and greatly shorten the service life of components. According to relevant data, 89% of concrete bridges in my country's coastal areas have corrosion of steel bars within 7 to 25 years, seriously affecting the travel safety of citizens and the image of the city. As one of the important methods to protect the concrete of buildings, concrete external protection technology uses the properties of the protective material itself and the physical and chemic...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent documents CN103045041A and CN105925091A disclose coating materials for the surface protection of concrete bridges whose main film-forming substances are pure acrylic emulsion and water-based acrylic resin. Without a systematic protection system, it is difficult to form a flat, continuous and effective protective layer when encountering defects such as fine cracks, honeycombs, pockmarks, and potholes on the concrete surface, which may easily cause protection failure

This invention is environmentally friendly, economical, and has a short construction period. However, it is difficult to avoid the problem of hollowing of the protective layer caused by construction defects or insufficient adhesion, and the final actual effect is difficult. ensure

Images