碱激发再生砖粉地聚物的抗压强度与微观特性  

Compressive strength and microscopic characteristics of alkali-activated recycled brick powder geopolymer

作　　者：周文娟 赵依琳[1] 季志远 钮浩翔 周理安 ZHOU Wenjuan;ZHAO Yilin;JI Zhiyuan;NIU Haoxiang;ZHOU Li'an(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Beijing Energy Conservation&Sustainable Urban and Rural Development Provincial and Ministry Co-construction Collaboration Innovation Center,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;China State Construction Land Guangzhou Branch,Guangzhou 510665,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]北京建筑大学北京节能减排与城乡可持续发展省部共建协同创新中心,北京100044 [3]中建地产广州有限公司,广东广州510665

出　　处：《中国粉体技术》2023年第4期36-45,共10页China Powder Science and Technology

基　　金：国家重点研发计划项目,编号:2017YFC0703305。

摘　　要：废弃黏土砖在建筑垃圾中占有较高比例,经过破碎、研磨后得到的再生砖粉存在火山灰活性,可作为地聚物的原料进行使用。采用正交实验方法研究矿物掺合料、激发剂、水与胶凝材料的质量比(水胶比)等因素对再生砖粉地聚物抗压强度的影响,并通过X射线衍射、扫描电镜能谱、红外光谱等微观手段系统地进行表征。结果表明:矿粉取代率、水玻璃掺量对再生砖粉地聚物抗压强度影响显著;矿粉取代率的提高,促使水化硅铝酸钠凝胶向水化硅铝酸钙凝胶转变,提高再生砖粉地聚物的抗压强度;高钙体系再生砖粉地聚物中含钠的水化硅铝酸钙、水化硅酸钙等多种凝胶与Ca(OH)_(2)晶体共存;偏高岭土的掺入促进含钠的水化硅铝酸钙凝胶的生成,提高聚合反应程度,延缓裂缝的生长,内部微结构得到较大改善,利于强度的发展。Waste clay bricks account for a high proportion of construction waste,and the recycled brick powder obtained after crushing and grinding has pozzolanic activity,which can be used as the raw material of geopolymers.The effects of mineral admixture,activator and mass ratio of water to cementitious material(water-binder ratio)on the compressive strength of recycled brick powder geopolymer were studied by orthogonal experimental method,and systematically characterized by microscopic means such as XRD,SEM-EDS and FTIR.The results show that the substitution rate of slag powder and the content of sodium silicate have obvious effects on the compressive strength of recycled brick powder geopolymer.With the increase of substitution rate of slag powder,sodium aluminosilicate hydrate gel changes to calcium aluminosilicate hydrate gel,the compressive strength of recy-cled brick powder geopolymer is improved.Sodium-containing calcium aluminosilicate hydrate,calcium silicate hydrate and other gels coexist with Ca(OH)_(2) crystals in the recycled brick powder geopolymer of high calcium system.Metakaolin promotes the for-mation of sodium-containing calcium aluminosilicate hydrate gel,increases the degree of polymerization,delays the growth of cracks,and improves the internal microstructure,the compressive strength is increased.

关 键 词：再生砖粉 地聚物 抗压强度 微观特性 

分 类 号：TU528.7[建筑科学—建筑技术科学] TB4[一般工业技术]