Effect of the Retarder on Initial Hydration and Mechanical Properties of the"one-step"Alkaliactivated Composite Cementitious Materials  

作　　者：DING Rui HE Yue LI Xingchen LI Han TIAN Hao WANG Hongen 丁锐

机构地区：[1]School of Materials Science and Engineering,Jilin Jianzhu University,Changchun 130118,China [2]Ziyang Urban Construction Investment Group Co.,Ltd,Nanchong 637000,China [3]Shandong Taihe Urban Construction Development Co.,Ltd.,Jining 272000,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2024年第5期1199-1213,共15页武汉理工大学学报（材料科学英文版）

基　　金：Funded by Key Laboratory for Comprehensive Energy Saving of Cold Regions Architecture of Ministry of Education(No.JLJZHDKF202204)。

摘　　要：This paper studied the effects of different retarders on the performance of the"one-step"alkali-activated composite cementitious material(ACCM)which is composed of ground granulated blast slag(GGBS)and fly ash(FA),and analyzed its mechanical properties,hydration mechanism,and retardation mechanism.The effects of retarders on the hydration products,mechanical properties,and hydration kinetics of ACCM were investigated using XRD,SEM,FTIR,EDS,and thermoactive microcalorimetry.The results showed that Na_(2)B_(4)O_(7)·10H_(2)O(B)delayed the exotherm during the alkali activation process and could effectively delay the setting time of ACCM,but the mechanical properties were slightly decreased.The setting time of ACCM increased with the increase in SG content,but the mechanical properties of ACCM decreased with the increase in SG content.C1_(2)H_(22)O_(11)(CHO)could effectively delay the hydration reaction of ACCM and weakly enhanced the compressive strength.H_(3)PO_(4)(HP)at a concentration of 0.05 mol/L had a certain effect on ACCM retardation,but HP at a concentration of 0.07 and 0.09 mol/L had an effect of promoting the setting and hardening time of ACCM.

关 键 词："one-step"alkali-activated composite cementitious materials solid activator hydration mechanism RETARDER retarding mechanism 

分 类 号：X705[环境科学与工程—环境工程] TQ177[化学工程—硅酸盐工业]