文献类型：期刊文献

英文题名：Mechanical properties, drying shrinkage, and nano-scale characteristics of concrete prepared with zeolite powder pre-coated recycled aggregate

作者：Hu, Hai-bo[1];He, Zhi-hai[1,2];Shi, Jin-yan[3];Liang, Chao-feng[1,2];Shibro, Tarekegn-gebresilas[1];Liu, Bao-ju[3];Yang, Shun-You[4]

机构：[1]Shaoxing Univ, Coll Civil Engn, Shaoxing 312000, Peoples R China;[2]Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Peoples R China;[3]Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China;[4]Yunnan Traff Grp Investment Co Ltd, Kunming 650000, Yunnan, Peoples R China

年份：2021

卷号：319

外文期刊名：JOURNAL OF CLEANER PRODUCTION

收录：SCI-EXPANDED(收录号：WOS:000728489600004)、、EI(收录号：20213410808482)、Scopus(收录号：2-s2.0-85113248568)、WOS

基金：The authors would like to acknowledge the Natural Science Foundation of Zhejiang Province (Grant No. LY20E020006), the International Scientific and Technological Cooperation Project of Shaoxing University (Grant No. 2019LGGH1009) and National Natural Science Foundation of China (Grant No. 51602198) for their financial support to the work present in this paper.

语种：英文

外文关键词：Recycled aggregates; Concrete; Compressive strength; dry shrinkage; Nano-mechanical properties

外文摘要：The utilization of recycled coarse aggregates (RCAs) obtained from construction & demolition wastes in concrete material has been a feasible sustainable development strategy. However, the poor properties of RCAs have some adverse effects on the performance of concrete. In this study, the properties of RCAs are enhanced by zeolite powder-cement (ZP-C) slurry pre-coating, and the compressive strength, dry shrinkage, microstructures and nano-mechanical properties of concrete containing natural coarse aggregates (NCAs), RCAs and the enhanced RCAs (ERCAs) are investigated. The results show that the incorporation of RCAs or ERCAs is detrimental to the development of concrete properties, compared with the NCAs. The compressive strengths of the concrete containing ERCAs are higher than that of the concrete containing RCAs, and the dry shrinkage strain of the former is lower than that of later, under the same conditions. Meanwhile, the width of enhanced interfacial transition zone (EITZ) between ZP slurry layer and new cement matrix (CM) decreases by 46.9%, compared with old ITZ (OITZ) between old CM and new CM. In the nanoindentation test, the elastic modulus of EITZ is higher than that of OITZ. The outcome of this study exploits the synergy between natural ZP and RCA to effectively solve the problem of poor effect of conventional strengthening methods on old demolition concrete wastes to improve the mechanical and drying shrinkage properties of recycled aggregate concrete while promoting resource conservation and recycling.