水镁石纤维增韧炉底渣基地质聚合物的制备和增韧机理  

Preparation and Toughening Mechanism of Bottom Ash-based Geopolymer Reinforced by Brucite Fiber

作　　者：柴倩[1,2] 张耀君[2] CHAI Qian;ZHANG Yao-jun(Huaqing College,Xi'an University of Architecture and Technology,Xi'an 710043,China;College of Material and Mineral Resources,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学华清学院,西安710043 [2]西安建筑科技大学材料与矿资学院,西安710055

出　　处：《硅酸盐通报》2018年第11期3392-3397,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(21676209);陕西省教育厅重点科研项目(16JS055)

摘　　要：以炉底渣为原料,水镁石纤维为增韧材料,通过碱激活反应制备水镁石纤维增韧炉底渣基地质聚合物。通过XRF、XRD、MIP及SEM对地质聚合物的成分、矿物相、孔结构及微观形貌进行了表征,探究了水镁石纤维的增韧机理。力学结果表明,当水镁石纤维掺量为0. 8wt%时,抗折强度提高26. 6%,增韧效果显著。XRD及MIP结果表明,水镁石纤维的加入,不改变地质聚合物的矿物相组成,以物理结合的方式嵌插于炉底渣的水化产物中,增加密实度,改善孔隙结构。炉底渣基地质聚合物韧性的提高应归因于纤维桥联、纤维脱粘和纤维拔出的共同作用。Brucite fiber reinforced bottom ash-based geopolymer were prepared through alkali-activated reaction with bottom ash as raw material,and brucite fiber as toughing material.The composition,mineral phases,pore structure and microstructure of the geopolymer were characterized by XRF,XRD,MIP,and SEM,and the toughening mechanism of the brucite fiber were studied.The mechanical results indicated that,the effect of toughening was significant since the flexural strength was increased by 26.6%when the content of brucite fiber was 0.8wt%.The results of XRD and MIP demonstrate that the mineral phase composition of the geopolymer didnt changed after brucite fiber are added.Instead,it is embedded into the hydration products of bottom ash in the way of physical bond to increase its density,and the structure of pores are improved relatively.The toughness improvement of bottom ash-based geopolymer should ascribed to the combined effect of fiber bridging,debonding and pulling.

关 键 词：炉底渣 水镁石纤维 地质聚合物 增韧 

分 类 号：X705[环境科学与工程—环境工程]