Concrete building anti-abrasion thin layer repairing material and repairing construction method

Abstract

The invention relates to a concrete building anti-abrasion thin layer repairing material and a repairing construction method. The repairing material comprises a solid ingredient A and a liquid ingredient B, wherein A contains 40.0-60.0% of metakaolin, 20.0-40.0% of an ultrafine natural zeolite powder and 10.0-20.0% of gypsum; B contains 60.0-80.0% of a polymer emulsion, 1.0-2.0% of a water reducer, 5.0-10.0% of a dihydric alcohol compound, 0-0.05% of an antifoaming agent, 0-0.05% of an air-entrainer, 0-1.0% of a set-retarding agent and 6.9-34.0% of water. According to the invention, the bonding property between the substrate concrete and the repairing material can be remarkably improved, contraction is greatly minimized, and cracking is avoided. In addition, the prepared repairing mortar has good workability and less gradual loss of fluidity. The anti scuffing thin layer formed by the adoption of the repairing mortar has high compressive strength, good abrasion resistance and cavitation resistant, and its coefficient of linear thermal expansion is consistent with the substrate concrete.

Description

technical field [0001] The invention relates to a thin-layer repairing material and a repairing construction method, in particular to an anti-abrasion thin-layer repairing material and a repairing construction method for a concrete building which is suitable for a part of a hydropower project subjected to high-speed water erosion. Background technique [0002] After 60 years of development, my country has made great achievements in dam construction. As of 2008, there were more than 5,100 dams over 30 meters in construction and under construction in my country, including more than 140 dams over 100 meters in height. During the operation of these dams, their overflow dams, spillways, spillway tunnels, sand washing tunnels, sluice chambers, floor plates, aprons, stilling basins, etc., have been subjected to long-term erosion and abrasion of suspended sediment and sediment. Impact wear and cavitation erosion of high-speed water flow can easily cause serious abrasive damage. Th...

AI Technical Summary

Problems solved by technology

[0005] Based on the serious abrasion damage during the operation of hydropower concrete construction projects, the present invention aims at the three key technical problems of anti-abrasion thin-layer repair, and proposes a concrete building anti-abrasion thin-layer repair material suitable for hydropower projects washed by high-speed water , the material overcomes the large difference in linear thermal expansion coefficient between epoxy mortar and base concrete, the need to dry the base surface, high cost, toxicity and other defects, as well as the plastic shrinkage, drying shrinkage and self-drying shrinkage of silica fume anti-abrasion materials, which are easy to crack It has high anti-erosion and anti-cavitation performance, and significantly improves the bonding performance with the base concrete, greatly reduces shrinkage, reduces the possibility of cracking, and the prepared repair mortar has good workability and fluidity Small loss over time