泡沫掺量对发泡碱激发矿渣聚合物性能和孔隙特征的影响

以水玻璃激发矿渣为胶凝材料,采用压缩空气发泡方式制备了泡沫矿渣聚合物材料,通过Image-Pro plus(IPP)表征了不同泡沫掺量下泡沫矿渣聚合物的孔隙结构特征,并研究了泡沫掺量对泡沫矿渣矿物聚合物干密度、抗压强度和导热系数的影响.结果表明:当泡沫掺量为4.45%~10.70%(质量分数)时,随泡沫掺量增加,泡沫矿渣聚合物的孔隙率增加、平均孔径及孔圆度值增大,泡沫矿渣聚合物相应的干密度、抗压强度和导热系数均呈负指数关系降低且相关性强;当泡沫掺量为4.45%~12.00%(质量分数)时,所制备碱激发矿渣聚合物泡沫材料的干密度389~1325 kg/m3、抗压强度1.12~17.81 MPa、导热系数0.0813~0.2211 W/(m·K),其综合性能优于通用水泥泡沫混凝土制品.

Effect of Foam Content on the Properties and Pore Structure of Foamed Slag-based Geopolymer

Alkali activated slag cement was used to prepare a foamed concrete, with compressed air foaming process.The pore structures of the foamed concretes were investigated by image process software(Image-Pro plus, IPP).The effects of foam content on the dry density, compressive strength and thermal conductivity of foamed slag-based geopolymers were studied.The results show that porosity, average pore diameter and roundness increase, when foam content increase from 4.45%-10.70%.A good negative exponent relationship between foam content and the main properties of the foamed slag-based geopolymers was observed.The dry density, compressive strength and thermal conductivity were in the range of 389-1325 kg/m3, 1.12-17.81 MPa, 0.0813-0.2211 W/(m·K), respectively, when foam content increased from 4.45%-12.00%.In comparison to Portland cement foam concrete,foamed slag-based geopolymers presented a lower thermal conductivity and a higher compressive strength.