| Title |
Hydration Heat and Strength Properties of High Fluidity Concrete with Admixtures and Construction Method |
| Keywords |
High Fluidity Concrete ; Fly Ash ; Blast Furnace Slag Powder ; Super Retarding Agent ; Flowing Concrete Method |
| Abstract |
This paper is intended to investigate fluidity, hydration heat and strength properties of high fluidity mass concrete with variation of admixtures and construction methods. The test results is following. The peak temperature of hydration heat shows between 1 and 2 day. Peak temperature of concrete with 0.34 of W/C is higher than that with 0.40 of W/C by 7℃. When fly ash is replaced by 25%, peak temperature of concrete with 0.34 and 0.40 of W/B is reduced by about 7℃ and 6℃ respectively. When blast furnace slag powder is substituted with 25%, hydration heat is not reduced much, but when it, with 50%, hydration heat is reduced by 6℃. As hydration heat properties with variation of construction methods, the peak temperature of hydration heat shows between 1 and 2 day in plain concrete, conventional concrete replaced with fly ash by 25% and the flowing concrete, but in case of super retarding agent-mixed concrete, it is retarded significantly between 5 and 6 days and the peak temperature lowers by 12℃. As the strength properties with variation of admixtures and construction methods, the compressive, flexible and tensile strength vary a little but do not show much differences compared with plain concrete. Also considering curing condition, those show high in order of 30℃ water-curing, 20℃ water-curing and 20℃ air-curing. |