摘要
CO_(2)强化不同品质和粒径再生骨料的特性研究尚不系统和完善。在约20%CO_(2)浓度和自然环境压力条件下,考虑再生粗骨料(RCA)品质和粒径的影响,试验测试了CO_(2)强化再生骨料(CRCA)的碳化率、CO_(2)吸收率、碱度、残留CO_(2)气体含量、吸水率及CO_(2)强化再生骨料混凝土(CRAC)的抗压强度和抗氯离子渗透性能。结果表明:CO_(2)强化再生骨料的碳化率和CO_(2)吸收率随再生骨料水灰比的增加而增加;CO_(2)强化显著降低了再生骨料的碱度,且CO_(2)强化再生骨料粒径越小、水灰比越低,其残留CO_(2)气体含量越高;CO_(2)强化显著降低了再生骨料的吸水率,明显提升CO_(2)强化再生骨料混凝土的抗压强度和抗氯离子渗透性能。
The properties of CO_(2)-modified recycled aggregates with different qualities and particle sizes have not been investigated systematically and comprehensively.In the conditions of 20%CO_(2)concentration and natural environmental pressure,considering the effect of recycled coarse aggregate(RCA)quality and particle size,the carbonization rate,CO_(2)absorption,alkalinity,water absorption of CO_(2)-modified recycled coarse aggregate(CRCA)and residual CO_(2)content in CRCA were investigated;the compressive strength and chloride penetration resistance of CO_(2)-modified recycled coarse aggregate concrete(CRAC)were also evaluated.The results show that the carbonization rate and CO_(2)absorption of CRCA increase with the increase of CRCA water-cement ratio;the CO_(2)modification significantly reduces the alkalinity of RCA;the smaller particle size and lower water-cement ratio of CRCA,the more CO_(2)sequestrates in CRCA;the CO_(2)modification remarkably reduces the water absorption of CRCA and significantly improves the compressive strengths and chloride penetration resistance of CRAC.
作者
高越青
潘碧豪
梁超锋
肖建庄
何智海
GAO Yueqing;PAN Bihao;LIANG Chaofeng;XIAO Jianzhuang;HE Zhihai(School of Civil Engineering,Shaoxing University,Shaoxing 312000,Zhejiang;Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province,Shaoxing University,Shaoxing 312000,Zhejiang,P.R.China;College of Civil Engineering,Tongji University,Shanghai 200092,P.R.China)
出处
《土木与环境工程学报（中英文）》
CSCD
北大核心
2021年第6期95-102,共8页
Journal of Civil and Environmental Engineering
基金
国家自然科学中巴联合基金(51661145023)
浙江省自然科学基金(LY20E080012)
绍兴市科技计划创新项目(2018C30007)。
