Impact abrasion of hydraulic structures concrete

Abstract

Most of the abrasion damage is caused by the action of water-borne particles (silt, sand, gravel, and other solid) impacting and rolling against the concrete surface during hydraulic structure operation. In this paper solid-particle abrasion of concrete containing slag was studied. Experiments included use of river sand abrade of mean diameter ∼ 0.6, 1.2, 2.5 and 5 mm, and sand content was 110, 230 and 340 kg per 1 m3 of water, impacting at 30°, 45° and 90° to the concrete surface. And the waterborne sand flow impact test method was used. Test results show that the abrasion rate to be a strong function of erodent size and waterborne sand content. As the erodent size increased from 0.6 mm to 1.2 mm, 2.5 mm, then to 5mm, the abrasion rate of concrete increased from 100% to 217% and 367%. The waterborne sand content was 110, 230 and 340 kg/m3 and the abrasion rate of concrete is 22-56 times of none sand water. Moreover, the abrasion rate of concrete impacted at 90° was higher than of that of 30°, 45° and 60°.