| Title |
Effect of Water-Binder Ratio and Replacement Ratio of Fly Ash on the Workability and Engineering Properties of Heavy-Weight Concrete |
| Authors |
Mun Jae-Sung ; Yang Keun-Hyeok ; Lee Ho |
| Keywords |
Heavy-weight Concrete ; Magnetite ; Engineering Properties ; Water-binder Ratio ; Fly Ash ; Code Provision |
| Abstract |
In this study, 10 heavy-weight concrete(HWC) mixes using magnetite aggregates were tested according to the variation of the water-to-binder ratio and the replacement ratio of fly ash. The different engineering properties of HWC, which include compressive strength development, stress-strain relationship, moduli of elasticity and rupture, splitting tensile strength and bond stress-slip relationship, were measured and compared with ACI 349 and/or CEB-FIP predictions. Test results showed that the tensile resistance capacity and long-term compressive strength gain of HWC are somewhat lower than the CEB-FIP prediction. In addition, the replacement of fly ash marginally affected the relationship of compressive strength of HWC and its engineering properties, though the amount of slip of a reinforcing bar embedded in HWC sharply increased when the replacement ratio of fly ash is above 25%. Hence, while considering the workability, compressive strength development and slip resistance against a tensile ribbed bar, the optimum replacement ratio of fly ash in HWC using magnetite aggregates can be recommended to be 15～20%. |