摘要
研究了羟基乙叉二膦酸四钠(HEDP.Na4)对碱激发矿渣复合材料(AASM)的新拌性能以及硬化性能的影响。结果表明:与空白对照组相比,掺入HEDP.Na4可延迟AASM浆体的初凝和终凝时间,最大分别延迟了43.8%和25.0%;与空白对照组相比,AASM浆体的微型坍落扩展度最大增加了20%,并且其屈服应力从57.2Pa下降到26.6Pa。另外,掺入HEDP.Na4的AASM基体在3 d龄期的抗压及抗弯强度均有所下降,而AASM的抗压和抗弯强度在28 d龄期分别提升了15.0%和11.6%。HEDP.Na4可降低AASM的早期水化热,细化AASM的孔径和降低基体的总孔隙率。综合可知,HEDP.Na4有效改善了AASM早期工作性能,且对后期硬化性能也有一定提升。因此,本研究可为AASM在建筑工程中的应用提供一定的指导方向。
The effect of tetrasodium hydroxyethylidene diphosphonate(HEDP.Na4)on the fresh and hardening properties of alkali-activated slag materials(AASM)was investigated.Compared with the control group,the initial and final setting time of AASM made with HEDP.Na4 are delayed by 43.8%and 25.0%,respectively.The mini slump of AASM with HEDP.Na4 is increased by 15%and its yield stress is decreased from 57.2 Pa to 26.6 Pa,as compared with AASM without HEDP.Na4.In addition,the compressive and flexural strengths at 3 days of AASM with HEDP.Na4 are reduced,but those at 28 days are increased by 15%and 11.6%,compared with AASM without HEDP.Na4.HEDP.Na4 can reduce the early hydration heat,modify the pore structure,and reduce the total porosity of AASM matrix.Comprehensively,HEDP.Na4 effectively improves the early working performance of AASM and the later hardening performance slightly.This research can provide a guidance for the application of AASM in construction engineering.
作者
龙武剑
张轩翰
吴卓锐
王晨宇
董必钦
韦经杰
LONG Wujian;ZHANG Xuanhan;WU Zhuorui;WANG Chenyu;DONG Biqin;WEI Jingjie(Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering,Shenzhen518060,Guangdong,China;Key Lab of Coastal Urban Resilient Infrastructure,MOE,Shenzhen University,Shenzhen518060,Guangdong,China;College of Civil and Transportation Engineering Shenzhen University,Shenzhen 518060,Guangdong,China;Department of Civil,Architectural,and Environmental Engineering,Missouri University of Science and Technology,Rolla,MO65409,USA)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2022年第8期2230-2238,共9页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金-山东联合基金(U2006223)
深圳市科技计划项目(JCYJ20190808151011502)。
关键词
碱激发
矿渣复合材料
流变性能
力学性能
显微结构
alkali-activated
slag composites
rheology properties
mechanical properties
microstructure
