文献类型：期刊文献

英文题名：Enhancing the elastic modulus of concrete prepared with recycled coarse aggregates of different quality by chemical modifications

作者：Liang, Chaofeng[1,2,4];You, Jinkui[1];Gu, Feng[1];Gao, Yueqing[1];Yang, Guowei[3];He, Zhihai[1,4];Hou, Shaodan[1,2,5];Duan, Zhenhua[2]

机构：[1]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China;[2]Tongji Univ, Dept Struct Engn, Shanghai 200092, Peoples R China;[3]Shaoxing Technol Ind Investment Co LTD, Shaoxing 312000, Peoples R China;[4]Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Zhejiang, Peoples R China;[5]Zhejiang Jinggong Steel Bldg Co Ltd, Shaoxing 312030, Peoples R China

年份：2022

卷号：360

外文期刊名：CONSTRUCTION AND BUILDING MATERIALS

收录：SCI-EXPANDED(收录号：WOS:000896933500002)、、EI(收录号：20224513070703)、Scopus(收录号：2-s2.0-85141229399)、WOS

基金：The financial support from the Natural Science Foundation of Zhejiang Province (Nos. Y20E080050, LGF22E080035), Science and Technology R&D Project of Ministry of Housing and Urban-Rural Development of China (No. 2021-K-123) are acknowledged. The tests support from 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 concrete; Recycled coarse aggregate; Chemical modification; Elastic modulus; Carbonation modification

外文摘要：Due to the presence of attached old mortar in recycled concrete aggregate (RCA), the elastic modulus of the prepared recycled aggregate concrete (RAC) is generally lower than that of normal concrete, which limits the application of RAC as structural concrete. To improve the elastic modulus of RAC, three different chemical modification methods, including fly ash-silica fume (FS) slurry, nano-SiO2 (NS) solution and carbonation mod-ifications, were carried out in this study. RCAs of different quality were used to verify the applicability of the three methods. The SEM and XRD tests were used to reveal the modification mechanism. The results show that the elastic modulus of RAC can be improved by any of the proposed chemical modification methods, among which the effect of the FS slurry is the most significant with the growth rate of 7.56%-10.56% in terms of different RAC. The modification effect of different methods on the elastic modulus of RAC, which is similar with the corresponding peak stress, is consistent with that on the quality of recycled aggregate. The SEM and XRD results show that the modified RAC has less micro-pores, denser interfacial transition zone and hydration products, which are also the main reasons for the improvement of the elastic modulus.