高校化学工程学报2017，Vol.31Issue(1)：211-221,11.DOI:10.3969/j.issn.1003-9015.2016.00.045
Na2O/SiO2摩尔比对粉煤灰-偏高岭土基秸秆地质聚合物复合材料热性能的影响
Effects of Na2O/SiO2 Ratio on Thermal Properties of Fly Ash-Straw-Metakaolin Composite Geopolymers
摘要
Abstract
Alkali activating agents play an important role in dissolving Si and Al atoms to prepare geopolymer precursors from aluminosilicate materials. This study explored the effects of alkali activating agents with different Na2O/SiO2 molar ratios (1.2, 1.3 and 1.5) andL/S (0.65 and 0.87, liquid to solid mass ratio) on the properties and high temperature performance (800\1000℃) of metakaolin-based geopolymers containing 15% fly ash substitution and 4% straw fiber. Compressive strength, thermal conductivity, scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP), thermoanalysis (TG-DSC), X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) were used to study the properties and thermal performance of the geopolymers. The results show that when Na2O/SiO2 = 1.2, the compressive strength and thermal conductivity of 7 d are 53 MPa and 0.05276 W?(m·K)-1, respectively. Higher concentration of sodium silicate facilitates the formation of denser microstructure and benefits geopolymerization, which results in a product with higher compressive strength even after thermal treatments.关键词
粉煤灰/秸秆/地质聚合物/耐高温性/压汞法/FTIRKey words
fly ash/straw/geopolymer/thermal resistance/mercury intrusion porosimetry/Fourier-transform infrared spectroscopy分类
通用工业技术引用本文复制引用
金漫彤,廖梦运,郑子丹,金赞芳..Na2O/SiO2摩尔比对粉煤灰-偏高岭土基秸秆地质聚合物复合材料热性能的影响[J].高校化学工程学报,2017,31(1):211-221,11.基金项目
浙江省自然科学基金(Y4090575). （Y4090575）
