Currently, in Korea, the frequent damage of aged concrete pavements causes route blockages due to maintenance and repair works. Ultra-rapid cement has been used as a measure to solve the economic losses which result from traffic delays, accidents, and civil complaints due to blocked routes. However, now, it couldn’t be used except for urgent constructions because the price is expensive and its onsite application is complicated, hence, fast hardening admixtures are being used in ordinary cement to solve the problem with ultra-rapid cement. In this research, it is intended to develop a material which enables early opening of the road being constructed and cured within 24 hours of closure, to secure durability characteristics of early strength concrete by incorporating admixtures (silica fume, latex, polymer powder), and to find optimal mixing ratio and select the optimal variable for each material.

• KyeoRe Lee(Kangwon national university)
• Yeongjong Jo(Kangwon national university)
• KyongKu Yun(Kangwon national university)