| Title |
An Experimental Study on the Fluidity and Compressive Strength Property of Mortar using Fly-Ash as Replacement Material of Fine Aggregate |
| Authors |
Kim Moo-Han ; Choi Se-Jin |
| Keywords |
Fly-Ash ; Replacement Material ; Fine Aggregate ; Fluidity ; Compressive Strength ; Addition Water Content(WFA) |
| Abstract |
Generally, when using the fly-ash as replacement material of cement content in concrete, it might be occur retardation of setting time and hardening. So, it is difficult to use large amount of fly-ash as a part of cement content. However, if it is used as replacement material of fine aggregate in concrete, it might be used a large amount of fly-ash in concrete and settled a problem for exhaustion of natural-aggregate resources. Furthermore, it was reported that compressive strength of HVFAC(High Volume Fly-Ash Concrete) using the fly-ash as a part of fine aggregate is higher than that of plain concrete. But, the larger the fly-ash is replaced, the more the fluidity of HVFAC decrease, because porous organization of fly-ash which is bone-dry state absorbs water content. This is an experimental study to compare and analyze the fluidity and strength properties of mortar using the fly-ash as replacement material of fine aggregate by addition water content of fly-ash(WFA). For this purpose, the mix proportion of mortar excepted coarse aggregate from base concrete according to the replacement ratio of fly-ash(0, 20, 40, 60, 80, 100% by sand volume) and addition water content of fly-ash(WFA : 22, 25, 28, 31, 34%) was selected, and then tests for flow and compressive strength were performed to find proper WFA which satisfy fluidity and strength. According to test results, it was found that the fluidity of mortar with WFA 25%, 28% was similar to that of plain mortar. And in case of WFA 25%, the effect of addition water content on the strength loss of mortar was smaller than any other. |