摘要
以低品位高烧失硅藻土为硅源,制备了地聚物材料,考察了硅藻土添加量以及所含有机质对材料抗压强度的影响。结果表明,高烧失硅藻土可在高比例(50%)添加下制备出抗压强度为26.2 MPa的地聚物材料,而在去除硅藻土中的有机质后,相应地聚物材料的抗压强度可进一步提升至57.4MPa。采用傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)和扫描电子显微镜(SEM)等方法系统分析了上述2组地聚物材料在成分、结构上的差异。结果表明,高比例添加硅藻土可以促进偏高岭石解聚,进而提升产物抗压强度;有机质则通过妨碍活性硅释放和单体缩聚以及提高气孔含量降低地聚物材料的抗压强度。
In this study, geopolymer materials have been prepared by using the low-grade and high-ignition-loss diatomite as the silica source, and the effects of contained organic matters and added amounts of diatomite in the prepared geopolymers on their compressive strengths have been investigated. It is found that a geopolymer with compressive strength of 26.2 MPa could be prepared at a high percentage(50 wt.%) of added high-ignition-loss diatomite, and another geopolymer with the compressive strength of 57.4 MPa could be prepared at the same percentage of added diatomite in which organic matters were totally removed. The differences in compositions and structures between the above two geopolymer materials have been analyzed by using the Fourier transform infrared spectroscopy(FTIR), X-ray diffraction(XRD), and scanning electron microscopy(SEM). The results show that the high percentage added diatomite could have promoted the depolymerization of metakaolin and then enhanced the compressive strength of products. The organic matters in diatomite could have caused the reduction of the compressive strength of prepared geopolymer materials by hindering the release of active silicon and monomer polycondensation, and increasing the content of pores in the prepared geopolymer.
作者
黄志浩
郭浩喆
卜红玲
张育新
刘冬
袁鹏
HUANG Zhi-hao;GUO Hao-zhe;BU Hong-ling;ZHANG Yu-xin;LIU Dong;YUAN Peng(CAS Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials,Guangzhou Institute of Geochemistry,Institutions of Earth Science,Chinese Academy of Sciences,Guangzhou 510640,China;CAS Center for Excellence in Deep Earth Seiences,Guangzhou 510640,China;University of Chinese Academy of Sciences,Beijing 100049,China;National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China,Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management,Institute of Eco-environmental and Soil Sciences,Guangdong Academy of Sciences,Guangzhou 510650,China;Collge of Materials Science and Engineering,Chongqing University,Chongqing 400030,China)
出处
《矿物学报》
CAS
CSCD
北大核心
2022年第5期631-639,共9页
Acta Mineralogica Sinica
基金
国家高层次人才领军人才项目
国家自然科学基金项目(编号:41972045)
广东省基础与应用基础研究基金(编号:2021A1515110941)。
关键词
地聚物
制备
碱激发
硅藻土
有机质
Geopolymer
preparation
alkali-activated
diatomite
organic matters
