Acrylate lotion and PVA fiber reinforced cement-based abrasion strength repair material

Abstract

Hydraulic concrete damaged by long-term scouring and grinding in high-speed sand flow, but the abrasion strength repair material based on cement modified by acrylate lotion and PVA fiber is little researched. To further explore the influence of its modification on the performance of cement-based abrasion strength repair material, the strengthening effect of acrylate lotion and PVA fiber on mechanical properties, pore structure and fracture toughness was focused. The research showed that when the lotion was modified alone, the flexural and compressive strength increased first and then decreased with the dosage, the abrasion strength strength increased by 33.3 % and the splitting tensile strength increased by 67.6 %; When PVA was modified alone, the flexural and compressive strength, abrasion strength and splitting tensile strength increased with the increase of dosage, and the maximum increased by 65.6 % and 163.0 % respectively. The composite modification effect was the best, and the abrasion strength was increased by 142.7 %, and the effect was the best when 0.5 wt% lotion was mixed with 1.0 wt% PVA. The splitting tensile strength, compression ratio and abrasion strength have the highest correlation. An appropriate amount of lotion refined the pore size, while an excessive amount increased the pore size; PVA significantly improved the abrasion strength, while the composite modification optimizes the pore size distribution, reduced the most probable pore size, and increased the pore tortuosity and fractal dimension. The synergistic effect of lotion, PVA and mortar has formed a "three network interconnection" system of "toughness strengthening+flexible buffer+rigid support", which has improved the performance of cement-based materials, and significantly improved the fracture toughness and abrasion strength. Which was suitable for the construction, maintenance and reinforcement of hydraulic concrete.