黃土를 活用한 多孔質 輕量 建築資材 開發에 관한 硏究
(The) Study on development of porous lightweight construction materials with the Hwangto
황토 건축재료 건축자재개발 재료공학;
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The main purpose of this study is to find the best conditions for the development of Hwangto-based ALC(Autoclaved Lightweight Concrete) and CLC(Castable Lightweight Concrete) for constructional materials with environmental functions. The best conditions were found out through the experiments such as characterization of basic properties of Hwangto and other raw materials, inducement of various batch compositions with reasonability, and confirmation of various properties of the hardened bodies prepared from various Hwangto ALC and CLC of various compositions. The every experiments were composed with succeeded grinding, mixing, casting, curing and measuring of physical properties such as mechanical strength, absorption ratio, adsorption ratio of VOC, specific gravity, thermal conductivity and emission ratio of far-infrared ray and etc. As a results of these studies, the best mechanical strength of Hwangto ALC were obtained with the Hwangto/diatomite ratio of 1:1. But in the case of Hwangto CLC, the activation of Hwangto by heat treatment at 850℃, and addition of pozzolan materials such as silica fume were needed because the pozzolanic reaction of the raw materials was too weak to get reasonable compressive strength. The mechanical properties of hardened bodies using the activated Hwangto and silica fume were most desirable at Hwangto/diatomite ratio of 3:2. Progress of hardening of mortars were due to the formation of tobermorite during autoclave curing, and C-S-H gels and ettringite during fume curing. In summary, autoclave curing Hwangto ALC that is satisfied with the needs of KS F2701 and hume-curing Hwangto CLC with better environmental properties such as VOC absorption than that of normal cement concrete could be developed as the result of this study.