Tai Pei, Chen Zhongkui, Li Zhaofeng, Chen Rui, Lu Hu, Li Yongjia
School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen 518055, China.
Department of Technical Research and Development, Shenzhen Yanzhi Science and Technology Co., Ltd., Shenzhen 518101, China.
Materials (Basel). 2022 Jan 29;15(3):1060. doi: 10.3390/ma15031060.
The utilization of construction waste soil to produce foamed concrete together with cement and a foaming agent is a promising method for waste recycling. Completely decomposed granite (CDG), which is widely available in southern China, was selected as a typical construction waste soil in foamed material production. The Taguchi method was applied to study the influence of various parameters on compressive strength, including cement dosage, CDG dosage, water to solid materials ratio (W/M), fine particles content, and gravel particles content. Analysis of variance (ANOVA) on a CDG-based sample showed that all factors have significant effects on compressive strength and the most effective parameter was cement dosage, followed in sequence by CDG dosage, W/M, gravel particles content, and fine particles content. However, only cement dosage and W/M influence the internal structure significantly during water/vacuum-immersion tests. The relationship between micro-pore structure and compressive strength suggested that with the decrease of open porosity, the compressive strength showed an increasing trend. This study reveals the possibility of CDG as a raw material for foamed lightweight soil and provides a technical reference of production procedure.
利用建筑渣土与水泥和发泡剂一起生产泡沫混凝土是一种很有前景的废物回收方法。完全分解花岗岩（CDG）在中国南方广泛可得，被选作泡沫材料生产中的典型建筑渣土。采用田口方法研究了包括水泥用量、CDG用量、水与固体材料比（W/M）、细颗粒含量和粗颗粒含量等各种参数对抗压强度的影响。对基于CDG的样品进行方差分析（ANOVA）表明，所有因素对抗压强度都有显著影响，最有效的参数是水泥用量，其次依次是CDG用量、W/M、粗颗粒含量和细颗粒含量。然而，在水/真空浸泡试验中，只有水泥用量和W/M对内部结构有显著影响。微孔结构与抗压强度之间的关系表明，随着开孔率的降低，抗压强度呈上升趋势。本研究揭示了CDG作为泡沫轻质土原材料的可能性，并提供了生产工艺的技术参考。
