文献类型：期刊文献

英文题名：Effects of pretreatment methods on the properties of recycled aggregates and prepared concrete under CO2-curing

作者：Lu, Jun[1,2];Cai, Zhedong[1];Gao, Yueqing[1];Yin, Yangyang[1,3];Ma, Zhiming[4];Liang, Chaofeng[1,3]

机构：[1]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China;[2]Zhejiang Yongjian New Mat Technol Co Ltd, Shaoxing 312300, Peoples R China;[3]Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Zhejiang, Peoples R China;[4]Yangzhou Univ, Coll Civil Sci & Engn, Yangzhou 225127, Peoples R China

年份：2023

卷号：18

外文期刊名：CASE STUDIES IN CONSTRUCTION MATERIALS

收录：SCI-EXPANDED(收录号：WOS:000921595000001)、、EI(收录号：20230213365803)、Scopus(收录号：2-s2.0-85145769292)、WOS

基金：The financial support from the Natural Science Foundation of Zhejiang Province (No. LGF22E080035, LY20E080012) are acknowledged. The tests support from the Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province and the Research center for the inheritance and development of famous historical and cultural cities of college of civil engineering, Shaoxing university are highly appreciated.

语种：英文

外文关键词：Recycled aggregate; CO 2-curing; Calcium hydroxide; Properties improvement; Microstructure analysis; Chloride penetrability

外文摘要：In this study, the standard CO2-curing, CO2-curing with pre-saturated Ca(OH)2 immersion and CO2-curing with cement slurry pre-wrapping as enhancement methods for recycled aggregates (RAs) and prepared concrete were investigated. The fundamental properties of the cured RAs were measured. The effects of different treatment methods on the stress-strain curve, capillary water absorption property and chloride penetrability of the prepared concrete were explored. Moreover, the pore structure analysis, scanning electron microscope, X-ray diffraction and thermo-gravimetric analysis were conducted on the RAs and prepared concrete. The results indicated that (1) the qualities of the carbon treated RAs with different pretreatment methods were improved by the formation of CaCO3, which filled the pores and micro-cracks from the microstructural analysis. (2) The mechanical properties of the prepared concrete were enhanced with more brittle behavior. (3) The permeability, pore structure, microstructure and chloride resistance of the cured RAC improved significantly. (4) The CO2-curing with pre-saturated Ca (OH)2 immersion method recorded the highest enhancing efficiency due to the addition of cal-cium ion.