강섬유 보강량에 따른 UHPC-PSC침목의 균열 발생양상 비교 분석

초록

In this study, PSC sleepers were fabricated using the UHPC (ultra high performance concrete) incorporating with coarse aggregate with the maximum particle size of 5 mm and steel fibers with the length of 19.5 mm. The reinforcement amounts of steel fiber used in the production of sleepers were 0.5%, 1%, and 1.5%, which is the key parameter in this study to compare the crack pattern of the sleepers. The static test on the rail seat section was carried out according to the EN 13230-2 test method. Test results showed that the number of cracks and the distribution of cracks became wider in the sleepers with more fiber added. In addition, it showed low crack propagation speed and it was confirmed that steel fiber is effective in suppressing crack growth.