低温常压下废弃混凝土的固化再利用研究  

Research on utilization of discarded concrete by solidifying with low temperature and atmospheric pressure

作　　者：孙光耀[1] 蒋采玲[1] 李川东[1] 蔡亮亮[1] 景镇子[1] 

机构地区：[1]同济大学材料科学与工程学院,上海201804

出　　处：《新型建筑材料》2013年第3期14-18,共5页New Building Materials

基　　金：国家自然科学基金项目(50872096;51072138)

摘　　要：采用水热固化技术,可将废弃混凝土在100℃低温、常压的条件下固化成抗折强度约为18 MPa的一种新型建筑材料。实验表明,NaOH溶液的浓度及添加量、Ca(OH)2添加量、固化时间等因素对固化体强度均有重要影响。样品强度提高的主要因素是水化硅酸钙凝胶(C-S-H)的生成。该技术可为工业化连续性处理废弃混凝土提供了参考。Hydrothermal solidification on discarded concrete has been carried out to produce a new kind of building material with the flfxural strength about 18 MPa at low curing temperature of 100℃ and atmospheric pressure. Experimental results showed that the flexural strength of the solidified bodies could be influenced by the NaOH concentration and content, Ca （OH）2 content and curing time. The strength development of specimens was found to be mainly due to the C-S-H gel formation. Hydrothermal solidification can provide the foundation to the industrialization and continuous production of construction materials from discarded concrete.

关 键 词：水热固化 废弃混凝土 100℃ 常压 抗折强度 水化硅酸钙凝胶 

分 类 号：X799.1[环境科学与工程—环境工程]