文献类型：期刊文献

英文题名：Effect of shrinkage reducing admixture on creep of recycled aggregate concrete

作者：He, Zhi-hai[1,2,3];Hu, Hai-bo[1];Casanova, Ignasi[4,5];Liang, Chao-feng[1,2,3];Du, Shi-gui[1,2,3]

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]Zhejiang Collaborat Innovat Ctr Prevent & Control, Shaoxing 312000, Peoples R China;[4]Univ Politecn Cataluna, Inst Energy Technol, Dept Civil & Environm Engn, Barcelona 08034, Spain;[5]Univ Politecn Cataluna, Barcelona Res Ctr Multiscale Sci & Engn, Barcelona 08034, Spain

年份：2020

卷号：254

外文期刊名：CONSTRUCTION AND BUILDING MATERIALS

收录：SCI-EXPANDED(收录号：WOS:000540695700034)、、EI(收录号：20201808587460)、Scopus(收录号：2-s2.0-85083771683)、WOS

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

语种：英文

外文关键词：Recycled aggregate; Concrete; Creep; Shrinkage reducing admixture; Microstructure

外文摘要：It is widely accepted that recycled concrete aggregates originated from construction and demolition wastes are promising materials to contribute to the conservation and rational use of natural resources as well as the protection of the environment. In this work, a comprehensive experimental investigation has been carried out in order to assess the effect of shrinkage reducing admixture (SRA) on the mechanical properties and creep of concrete manufactured with recycled coarse aggregates from the different parent concrete with compressive strengths of 30 MPa and 80 MPa, respectively. Meanwhile, mercury intrusion porosimetry (MIP) and scanning electron microscope (SEM) have been performed to determine the variation of internal microstructure. The results indicate that the quality of recycled aggregates has important effect on the properties of concrete. The addition of SRA furtherly reduces the early mechanical properties of recycled aggregate concrete, and however, improves the later mechanical and creep properties. Compared with the reference concrete manufactured with natural coarse aggregates, concrete manufactured with SRA and recycled coarse aggregates with high quality exhibits the later higher compressive strength and elastic modulus as well as lower creep, which is largely due to the later more compact microstructure such as interfacial transition zone and pore structure. (C) 2020 Elsevier Ltd. All rights reserved.