摘要
研究了纳米CaCO_(3)(NC)和粉煤灰(FA)单掺及复掺对再生骨料混凝土(RAC)坍落度、力学性能、抗氯离子渗透性能、水化反应和微观结构的影响.结果表明:NC能够提高RAC的力学性能、抗氯离子渗透性能及水化反应速率,但会降低其坍落度;FA能够提高RAC的抗氯离子渗透性能和后期力学性能,但会降低其水化反应速率和早期力学性能;两者复掺后,单掺NC、FA时的负面影响得到改善,RAC具有较优的坍落度、力学性能、抗氯离子渗透性能和水化反应速率;复掺NC和FA可以降低RAC中氢氧化钙(CH)晶体的含量,填充RAC浆体结构的孔隙,修复新旧砂浆之间的界面过渡区(ITZ),提高RAC的密实度.
The effects of single bending and compound bending of nano CaCO_(3)(NC)and fly ash(FA)on the slump,mechanical properties,chloride penetration resistance,hydration reaction and microstructure of recycled aggregate concrete(RAC)were studied.The results show that NC can improve the mechanical properties,chloride penetration resistance and hydration reaction rate of RAC,but reduce its slump.FA can improve the resistance to chloride penetration and the late mechanical properties of RAC,but reduce its hydration reaction rate and early mechanical properties.The negative effects of single addition of NC and FA are improved after the two compounds are mixed.RAC has better slump,mechanical properties,chloride penetration resistance and hydration reaction.The compound bending of NC and FA can reduce the content of calcium hydroxide(CH)crystals in RAC,fill the pores of RAC slurry structure,repair the interface transition zone(ITZ)between new and old mortar,and improve the compactness of RAC.
作者
程子扬
陈国夫
屠艳平
CHENG Ziyang;CHEN Guofu;TU Yanping(School of Civil Engineering and Architecture,Wuhan Institute of Technology,Wuhan 430073,China;Hubei Provincial Engineering Research Center for Green Civil Engineering Materials and Structures,Wuhan Institute of Technology,Wuhan 430073,China)
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2023年第3期228-235,共8页
Journal of Building Materials
基金
湖北省重点研发计划项目(2020BAB071)
武汉工程大学研究生创新基金资助项目(CX2021119)。
