| Title |
An Experimental Study on the Physical and Hygroscopical Properties of Autoclaved Lightweight Concrete(ALC) with Hwangtoh Powder |
| Keywords |
Humidity control ; Autoclaved Light Concrete (ALC) ; Soil ; Diatomite ; Hwangtoh |
| Abstract |
The purpose of this study is to determine the optimum batch composition for fabricating the Hwangtoh based autoclaved lightweight concrete(ALC) as constructional material which controls humidity. First off the effects of raw material on the prosperity of ALC were examined. We had tested at the different mixing ratios to determine the optimum mixing ratio of Hwangtoh and diatomite. When Hwangtoh and diatomite mixed equally, the physical data-the compressive strength and bulk density were appeared best. To select bonding agent, portland cement, fly ash and slag were tested. when portland cement and fly ash were used, crack were appeared on the surface of ALC due to the over-contraction during hardening. XRD and SEM analysis showed that ettringite crystals were developed when portland cement was used, and C-H-S gel was formed when fly ash was used, and tobermorite and C-H-S gel were formed when slag was used. The optimum batch composition for manufacturing the ALC was 15 wt.% of soil, 15 wt.% of diatomite, 28.2 wt.% of slag, 25.6 wt.% of sand, 11.4 wt.% of quick lime and 4.8 wt.% of hemi hydrate. ALC made from above composition showed 50 ㎏f/㎠ of compressive strength, 98% of deodrant ratio, 0.188 w/m of thermal conductivity and 91% of far-infrared radiation. |