活化煤矸石地质聚合物的制备与性能研究  

Preparation and Properties of Activated Coal Gangue Geopolymer

作　　者：王菲 刘泽[1] 韩乐 谢福助 WANG Fei;LIU Ze;HAN Le;XIE Fuzhu(Research Institution of Concrete and Eco-Materials,School of Chemical and Environmental Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,混凝土与环境材料研究所,北京100083

出　　处：《硅酸盐通报》2021年第3期914-920,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家重点研发计划(2019YFC1904300);国家自然科学基金联合基金项目(U20A20324);宁夏回族自治区重点计划计划(2020BCE01001);中国矿业大学(北京)越崎青年学者基金(2019QN10)。

摘　　要：对原状煤矸石进行了定性和定量双重分析,优化了煤矸石活化的煅烧温度,探究了钠铝比(n(Na)/n(Al)=0.52、0.57、0.62)和激发剂模数(M=0.66、0.69、1.32、1.65)对活化煤矸石地质聚合物抗压强度和微观结构的影响。利用XRD、FT-IR和SEM对活化煤矸石地质聚合物的微观结构进行了分析表征。结果表明,高温活化煤矸石有助于激发煤矸石中的活性组分,在煅烧温度为600℃时,高岭岩相完全消失,“鼓包峰”面积相对较大,可用于制备活化煤矸石地质聚合物。n(Na)/n(Al)的提高促进了地质聚合反应的进行,抗压强度也随之提高,同时随着激发剂模数的增加,抗压强度也随之增加。当n(Na)/n(Al)为0.62,激发剂模数为1.65时,试样7 d的抗压强度可达到52 MPa。活化煤矸石地质聚合物的聚合产物主要为水化硅铝酸钠(N-A-S-H)凝胶,水化产物致密,性能优良。The original coal gangue was analyzed both qualitatively and quantitatively,the calcination temperature of activated coal gangue was optimized,and the effects of sodium-aluminum ratio(n(Na)/n(Al)=0.52,0.57,0.62)and the activator modulus(M=0.66,0.69,1.32,1.65)on the compressive strength and microstructure of activated coal gangue geopolymer were investigated.The microstructure of activated coal gangue geopolymer was characterized by XRD,FT-IR and SEM.The results show that activated coal gangue at high temperature is helpful to activate the active components in coal gangue.When the calcination temperature is 600℃,the kaolinite facies disappears completely and“the bulge peak”area is relatively large,which can be used to prepare activated coal gangue geopolymer.The increase of n(Na)/n(Al)promots the geopolymer reaction,and the compressive strength is also increased.Meanwhile,the compressive strength is also increased with the increase of the excitation modulus.When n(Na)/n(Al)is 0.62 and the activator modulus is 1.65,the compressive strength of the sample on 7 d reaches to 52 MPa.The product of activated coal gangue geopolymer is sodium silicate hydrate(N-A-S-H)gel,the hydration product is compact and has good performance.

关 键 词：煅烧温度 煤矸石 地质聚合物 材料强度 微观结构 

分 类 号：TU52[建筑科学—建筑技术科学]