摘要
地质聚合物混凝土(GPC)能最大限度地减少自然资源的消耗。粉煤灰和矿粉的配合比对于GPC的性能具有较大影响。本研究制备了普通硅酸盐混凝土(OPC)、全粉煤灰配方及部分矿粉代替FA制备的地质聚合物混凝土GPC-0、GPC-10、GPC-20、GPC-30(矿粉:0、10%、20%和30%),对比不同GPC的冻融后的性能,即重量变化,抗压强度损失,相对动态弹性模量损失。结果表明:矿粉含量最高的GPC-30的质量损失率小和抗压强度高,远优于其他地质聚合物混凝土。利用共振频率测试(RFT)的无损检测方法测定动态弹性模量,表明矿粉基比全粉煤灰CPC具有更好的抗冻融性。粉煤灰的含量越高,矿粉的含量越低,养护制备出的混凝土的力学性能退化就越大,并得出GPC的实用性能以及不同比例配方,这为今后的试验和工程应用提供数据和理论支持。
Geopolymer concrete(GPC) can reduce the consumption of natural resources.The mix proportion of fly ash and slag has great influence on the performance of geopolymer concrete.In this study,ordinary Portland concrete(OPC),geopolymer concrete with complete fly ash formula(GPC-0)、geopolymer concrete with fly ash replaced by slag GPC-10,GPC-20,GPC-30(10%,20% and 30%slag) are prepared.The properties of different geopolymer concrete after freeze-thaw are compared,including weight change,compressive strength loss and relative dynamic elastic modulus loss.The quality loss and compressive strength of GPC-30 with the highest slag content are far better than those of other groups.Resonance frequency test(RFT) is a nondestructive method to determine the dynamic elastic modulus.The RFT results after each specified freeze-thaw cycle show that the slag based geopolymer concrete has better freezethaw resistance.With high fly ash content and low slag content,the concrete has bad mechanical degradation performance after curing.The practical performance and different proportion formulas of geopolymer concrete are obtained,which provide data and theoretical support for future experiments and engineering applications.
作者
蒙华良
黄禧
Meng Hualiang;Huang Xi(Guangxi Yuansheng slag comprehensive utilization Co.,Ltd,Fangchenggang,538000,China)
出处
《水泥工程》
CAS
2022年第4期8-11,34,共5页
Cement Engineering
关键词
地质聚合物混凝土
冻融循环
矿粉
动态弹性模量
Geopolymer concrete
freeze-thaw cycle
ground granulated blast furnace slag
dynamic modulus of elasticity
