文献类型：期刊文献

英文题名：Evaluation of high-volume fly ash (HVFA) concrete modified by metakaolin: Technical, economic and environmental analysis

作者：Nie, Yanfeng[1];Shi, Jinyan[2];He, Zhihai[3];Zhang, Baifa[4];Peng, Yiming[5];Lu, Jingzhou[1]

机构：[1]Yantai Univ, Sch Civil Engn, Yantai 264005, Peoples R China;[2]Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Peoples R China;[3]Shaoxing Univ, Coll Civil Engn, Shaoxing 312000, Peoples R China;[4]Guangdong Univ Technol, Sch Civil & Transportat Engn, Guangzhou 510006, Guangdong, Peoples R China;[5]Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China

年份：2022

卷号：397

外文期刊名：POWDER TECHNOLOGY

收录：SCI-EXPANDED(收录号：WOS:000790502800006)、、EI(收录号：20220311471026)、Scopus(收录号：2-s2.0-85122769339)、WOS

基金：The authors would like to acknowledge Research Fund for Young Doctors of Yantai University and National Natural Science Foundation of China (Grant No. 51978596) .

语种：英文

外文关键词：Fly ash; HVFA concrete; Metakaolin; Nanoindentation; Drying shrinkage

外文摘要：Incorporating high-volume fly ash (HVFA) to concrete is one of the effective means to reduce the carbon footprint of buildings, but it also leads to problems such as the slow performance development of concrete. In this study, metakaolin (MK) as a calcined clay mineral is used to modify HVFA concrete, and the multi-scale characteristics of concrete are studied. The results show that compared with plain concrete, the mechanical properties and the volume fraction of hydration products of HVFA concrete are reduced, and the microstructure becomes loose. When 20% of MK is used to replace FA, the 90-d compressive strength of HVFA concrete are similar to those of plain concrete, and the drying shrinkage and porosity are relatively lowest, and the microstructure is relatively dense. The performance enhancement of MK-modified HVFA concrete is attributed to the increase of C-S-H phase and the decrease of the content of pore phase. Meanwhile, incorporating an appropriate amount of MK can reduce the carbon footprint and cost of HVFA.(c) 2022 Elsevier B.V. All rights reserved.