地聚合物基陶粒泡沫混凝土孔结构调控及性能研究  

Pore structure control and performance of geopolymer based ceramsite foam concrete

作　　者：王晴[1] 李童 张强[1] 陈彦文[1] 戴民[1] 贺天姝[1] WANG Qing;LI Tong;ZHANG Qiang;CHEN Yanwen;DAI Min;HE Tianshu(School of Materials Science and Engineering,Shenyang Jianzhu University,Shenyang 100168,China)

机构地区：[1]沈阳建筑大学材料科学与工程学院,辽宁沈阳100168

出　　处：《混凝土》2023年第4期82-86,共5页Concrete

基　　金：辽宁省应用基础研究项目(2022JH2/101300118);住房与城乡建设部科学研究项目(2022-K-087);沈阳市“双百工程”重大科技成果转化项目(Z19-4-011)。

摘　　要：选用矿渣和粉煤灰为原料,陶粒为轻集料,水玻璃为碱激发剂,采用物理发泡法,通过碱激发方式制备地聚合物基陶粒泡沫混凝土(GCFC),研究泡沫掺量、陶粒掺量及陶粒等级对GCFC性能的影响,探究了GCFC孔结构的变化趋势。结果表明:当陶粒掺量为30%、陶粒等级500 kg/m3时,随着泡沫掺量增加,当泡沫掺量1.0倍时,比强度达到峰值10273 N·m/kg,导热系数为0.109 W/(m·K);当泡沫掺量1.2倍、陶粒等级500 kg/m^(3)时,随着陶粒掺量增加,GCFC比强度先增大后减小,掺量为30%时比强度达到峰值9902 N·m/kg,导热系数为0.097 W/(m·K)。当泡沫掺量小于1.2倍,经20次冻融循环后GCFC的质量损失率和冻后强度满足标准要求;GCFC冻后强度与陶粒等级成正比关系。GCFC孔结构的圆度值随泡沫掺量的增加而变大,当泡沫掺量超过1.2倍后,圆度值增加速度加快;当陶粒掺量逐渐增大时,平均圆度值先降低再升高,陶粒掺量为30%时平均圆度值下降至最低为1.42。Geopolymer based ceramisite foam concrete is prepared by physical foaming method using slag and fly ash as raw materials,ceramisite as light aggregate,and water glass as alkali activator.The effects of foam content,ceramsite content and ceramsite grade on the properties were studied,and the changing trend of pore structure of GCFC was explored.The results show that the specific strength reaches the peak of 10273 N·m/kg and the thermal conductivity is 0.109 W/(m·K)when the content of ceramsite is 30%with grade of 500 kg/m3,and the foam content is 1.0 times.When the foam content is 1.2 times and ceramsite grade is 500 kg/m^(3),the specific strength of GCFC increases first and then decreases with the increase of ceramsite content.When the foam content is 30%,the specific strength reaches the peak of 9902 N·m/kg,and the thermal conductivity is 0.097 W/(m·K).After 20 freeze-thaw cycles,the mass loss rate and the strength after freezing meet the standard requirements while the foam content is greater than 1.2 times.The strength of GCFC after freezing is proportional to the grade of ceramsite.The roundness of GCFC pore structure increases with the increase of foam content.When the foam content exceeds 1.2 times,the roundness value increases rapidly.The average roundness decreases first and then increases with the content of ceramsite increases gradually.Average roundness decreases to the lowest value of 1.42 while the content of ceramsite is 30%.

关 键 词：地聚合物 陶粒泡沫混凝土 比强度 孔结构 

分 类 号：TU528.041[建筑科学—建筑技术科学]