Influence of water-to-binder ratios on the performance of limestone calcined clay cement-based paste for mining applications  

作　　者：Zhiqiang Feng Jian Zhao Guangping Huang Wei Victor Liu 

机构地区：[1]Department of Civil and Environmental Engineering,University of Alberta,Edmonton,Alberta T6G 1H9,Canada

出　　处：《Green and Smart Mining Engineering》2024年第3期262-272,共11页绿色与智能矿业工程（英文）

基　　金：supported by the Natural Sciences and Engineering Research Council of Canada(No.NSERC RGPIN-2017-05537).

摘　　要：This study aims to investigate the impact of various water-to-binder(w/b)ratios by mass(0.3–2.0)on the performance of limestone calcined clay cement(LC^(3))pastes.The flowability,setting time,density,unconfined compressive strength,hydration,and microstructure of LC^(3) pastes under different w/b ratios were thoroughly investigated.The results show that increasing the w/b ratio extends the flowability and setting time while significantly reducing the unconfined compressive strength of LC^(3) pastes.LC^(3) pastes with w/b ratios above 0.6 exhibited a final flow diameter surpassing 167 mm,indicating good flowability.The 28-d unconfined compressive strength decreased from 82.3 to 1.3 MPa as the w/b ratio increased from 0.3 to 2.0.This study confirmed that the relationship between unconfined compressive strength and the w/b ratio of LC^(3) follows Abram’s law.Furthermore,a modified gel/space ratio was proposed to reflect the concentration of solid products,effectively explaining the influence of the w/b ratio on strength,with an R2of 0.96.

关 键 词：Water-to-binder ratio Limestone calcined clay cement Gel/space ratio FLOWABILITY Unconfined compressive strength Bound water 

分 类 号：TQ172.1[化学工程—水泥工业]