현장타설 콘크리트궤도 시공 중 초기균열 저감을 위한 연구

초록

Cracks in concrete slab track have reduced long-term durability and increased the maintenance time and cost, and invoked the social controversy about railway safety. In this study, effective countermeasures are investigated to reduce cracks in concrete slab track caused by the temperature change of the temporary rail made from steel during on-site curing of concrete. The effectiveness to reduce the early age cracking is evaluated by adopting alternative methods: using temporary rails made from composite materials with low thermal expansion coefficient, and covering concrete slab track with thick packing sheets immediately after the casting of concrete. It is revealed from this research that efficient methods to reduce early age concrete cracking in concrete slab track are 1) minimize the temperature changes of rails by covering concrete slab track with thick packing sheets right after the casting of concrete, 2) disassemble of the temporary rails as soon as possible, and 3) cast concrete while temperature changes are insignificant.