Experimental study and field application of abrasion resistance for the repair of concrete water-conveying structures

Concrete structures subjected to long-term hydraulic impact by water-borne sand would suffer abrasion damage, resulting in reduced service life. The effect of aggregate type, water-binder ratio, and maximum aggregate size on the abrasion resistance of concrete was studied by the underwater method. Based on the laboratory, four mixture ratios were selected for the repair concrete of the bottom slab in the desilting channel. The surface morphologies of the concrete repaired after flood season abrasion erosion was monitored. The results show that iron ore and (or) iron sand concrete have better abrasion resistance than that of the natural gravel and (or) natural sand concrete. With the reduction of water-binder ratio and maximum aggregate size, the abrasion resistance and the compressive strength of concrete was improved. The field test and the laboratory result can be concluded that the reasonable matching of aggregate strength, mortar strength, and the interfacial bonds between aggregate and mortar could significantly improve the abrasion resistance of concrete.