【摘要】 研究了稻壳灰作为硅质材料部分取代粉煤灰对蒸压加气混凝土结构与性能的影响。样品在1.2 MPa,195℃水热条件下固化10h制取，对制得样品进行X射线荧光分析（XRF）、X射线衍射（XRD）、扫描电子显微镜（SEM）和数字影像表征。结果表明，随稻壳灰含量增加，样品钙硅比下降，可形成更精细致密的钙钒石晶体和细小的孔结构。综合对比不同样品的体积密度，抗压强度，热导率性能，获得了最优稻壳灰-粉煤灰替代比为24%。在该替代比条件下，制备样品密度为507～527kg/m~3，抗压强度从替代前的2.6MPa提升至3.4MPa，且导热系数降低24%。稻壳灰作为无定形硅质材料与粉煤灰配合，具有制备轻质建筑材料的应用潜力。更多还原

【Abstract】 The influence of using different amount of rice husk ash as a siliceous material source substitution to produce environment-friendly autoclaved aerated concrete(AAC)based on fly ash were examined.Fly ash and rice husk ash were used as siliceous material replacement.Test samples were cured under hydrothermal conditions with steam pressure of1.2 MPa at a temperature of 195℃for 10 hours.Test sample was then analyzed by X-Ray Fluorescence(XRF),X-Ray Diffraction(XRD),Scanning Electron Microscope(SEM)and Optical Imaging(OI).The results show that with increasing content of rice husk ash,calcium to silica ratio decreased.Tobermorite with finer and compact crystal structure and pore with smaller size were formed.Samples bulk density,compressive strength,thermal conductivity and microstructures were analyzed and compared as to which substitution level of 24% was the most promising.The results indicate that to the optimal substitution level,fly ash and amorphous rice husk ash could be used to produce AAC with bulk density of 507～527 kg/m~3,compressive strength that increase from 2.6 to 3.4 MPa and thermal conductivity that lowered by 24%.Therefore,rice husk ash together with fly ash as siliceous material has the potential for application in lightweight construction material.更多还原