粉煤灰-矿渣基泡沫地聚合物微观孔隙结构与宏观性能

Micro-pore Structure and Macro-properties of Fly Ash-Slag Based Foam Geopolymer

以粉煤灰和矿渣为主要原材料,H_(2)O_(2)为发泡剂,通过碱激发方法制备粉煤灰-矿渣基泡沫地聚合物.研究碱激发剂模数和粉煤灰掺量对泡沫地聚合物微观孔隙结构、抗压强度及导热系数的影响.基于X射线衍射仪(XRD)、光学显微镜和CT扫描分析了反应产物和孔隙结构参数对泡沫地聚合物性能影响的内在机理.同时,基于灰色关联分析得到泡沫地聚合物的孔隙结构参数与其导热系数和强度的相关关系.结果表明:泡沫地聚合物的导热系数主要由孔隙率决定,两者呈指数负相关;泡沫地聚合物的抗压强度与孔隙连通度、孔隙率、平均孔径及分级孔隙占比有关,其中孔隙连通度和孔隙率影响最显著.

The foam geopolymer was prepared by alkali activation method with fly ash and slag as main raw materials.The effects of alkali activator module and fly ash content on the microstructure,compressive strength and thermal conductivity of foam geopolymer were studied.The internal mechanism of reaction products and pore structure parameters influencing the properties was analyzed based on X-ray diffractometer(XRD),optical microscope and computed tomography(CT)scanning.At the same time,the correlation between pore structure parameters and thermal conductivity and strength was obtained based on grey correlation analysis.The results show that the thermal conductivity of foamed geopolymer is mainly determined by the porosity of the sample,and they are exponentially negatively correlated.The compressive strength is related to pore connectivity,porosity,average pore size and fractional pore proportion,and the influences of pore connectivity and porosity was the most significant.