文献类型：期刊文献

英文题名：A novel development of green UHPC containing waste concrete powder derived from construction and demolition waste

作者：He, Zhi-hai[1,2];Han, Xu-dong[1];Zhang, Meng-yuan[1];Yuan, Qiang[3];Shi, Jin-yan[3,5];Zhan, Pei-min[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]Tongji Univ, Key Lab Adv Civil Engn Mat, Minist Educ, Shanghai 201804, Peoples R China;[5]Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Peoples R China

年份：2022

卷号：398

外文期刊名：POWDER TECHNOLOGY

收录：SCI-EXPANDED(收录号：WOS:000789171900007)、、EI(收录号：20215211399632)、Scopus(收录号：2-s2.0-85121788223)、WOS

基金：The authors would like to acknowledge the Natural Science Founda-tion 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) , and National Innovation and Entrepre-neurship Training Program for College Students (202010349011) for their financial support to the work present in this paper.

语种：英文

外文关键词：UHPC; Recycled concrete powder; C& D waste; Nanoscale characteristics; Sustainability

外文摘要：In order to explore the influence mechanism of recycled concrete powder (RCP) on the multi-scale characteristics of UHPC mixtures were investigated. The results indicated that the optimum UHPC mixture prepared with 30% RCP had a relatively low early-age (7-day) autogenous shrinkage strain of 4041.86 mu epsilon, and the highest mechanical properties (Compressive strength of 123 MPa at 28 days). Such values were 5600 mu epsilon and 128 MPa, respectively, for plain UHPC mixture. Although the use of RCP to replace part of the silica fume (SF) reduced the content of hydration products in the matrix, and reduced its compactness, an appropriate amount of RCP (30%) could increase the packing density among particles, thereby improving the polymerization degree of the C-S-H gel. Meanwhile, the environmental benefit of UHPC was also investigated, which also showed that the use of RCP to replace 30% of SF was feasible and sustainable.(c) 2021 Elsevier B.V. All rights reserved.