The Hydraulic Abrasion and Impact Resistance of Concrete

• Main Authors: Siang-Jhih Sun, 孫祥智
• Other Authors: Yu-Wen Liu
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/60109007640509528267

碩士 === 國立嘉義大學 === 土木與水資源工程學系研究所 === 103 === This study mainly explores abrasion-resistance of concrete by using the abrasion tester with steel ball for high speed water impact developed by Dr. Liu’s research team. It conducts tests with changeable impact angle and ball size as varieties, and then compares the concrete mixed with different proportions of coarse aggregate and quantity of carbon fiber. As for specimens of the same composition, about 37% of impact abrasion amount is increased at an impact angle of 75°and 90°; for the part of steel ball size, accumulated impact abrasion amount of ball ofψ0.75 accounts for only 20% of that ofψ1.00, and steel balls ofψ1.25 have a similar performance toψ1.00 in impact abrasion, whose accumulated impact abrasion amount increases about 3% compared toψ1.00. In the test with steel ball ofψ1.00 at an impact angle of 75°, the average compressive strength reduces by 13% when the cement slurry is fixed and the coarse aggregate in specimen is reduced from 55% to 50%, and the resistance performance against water flow containing with sediment and steel balls also reduces about 20%. However, when the coarse aggregate is increased from 55% to 60%, the aforementioned resistance performance increases by about 21% and 11% respectively, showing that the increase of coarse aggregate can promote the abrasion resistance performance of concrete against water impact. On the other hand, in the test of abrasion resistance to water flow with steel ball, specimen added with 0.5% of carbon fiber increases by about 10.7% in abrasion resistance performance compared to that without additional fibers. In addition, if the carbon fiber is added 1% to the specimen, its resistance performance will increase by about 40% compared to that with no additions.