|
Title |
Optimum Mixture Proportioning of Autoclave Lightweight Aerated Concrete considering Required Foaming Rate and Compressive Strength
|
|
Authors |
윤현섭(Hyun-sub Yoon) ; 양근혁(Keun-hyeok Yang) |
|
DOI |
https://doi.org/10.4334/JKCI.2019.31.2.123 |
|
Keywords |
오토클레이브 ; 기포 콘크리트 ; CaO/SiO2 몰비 ; 발포율 ; 압축강도 autoclave ; aerated concrete ; CaO/SiO2 molar ratio ; foaming rate ; compressive strength |
|
Abstract |
The present study measured the foaming rate of slurry specimens produced with different mixing proportions including various CaO-SiO2 molar ratios (C/S), water-to-binder ratios (W/B), and foaming agent contents. The slurry specimens achieving the targeted foaming rate (160~180 %) were examined to evaluate the compressive strength, oven-dry density, and thermal resistance of hardened aerated concrete cured under high temperature and high pressure conditions in order to establish fundamental data for advanced autoclaved lightweight concrete (ALC). This study also ascertained that the ALC produced using Lab-scale autoclave equipment developed considerably lower compressive strength than the companion ALC produced in the field system, although similar dry density and thermal resistance of ALC were obtained in both production systems. Considering the foaming rate of slurry and the compressive strength of ALC, the following mixing proportions are recommended: C/S of 0.5, W/B of 50 %, and aluminum powder ratio of 0.12 %. Furthermore, quartzite with tridymite structure generated from crystallization process of SiO2 under high temperature was more favorable for slurry foaming of ALC than quartzite with plate-type quartz.
|