Study of performances and microstructures of mortar with calcined low-grade clay

Title: Study of performances and microstructures of mortar with calcined low-grade clay
Creator: Zheng, Dapeng; Liang, Xinwen; Cui, Hongzhi; Tang, Waiching; Liu, Wei; Zhou, Ding
Relation: Construction and Building Materials Vol. 327, no. 126963
Publisher Link: http://dx.doi.org/10.1016/j.conbuildmat.2022.126963
Publisher: Elsevier
Resource Type: journal article
Date: 2022
Description: This paper studied the effect of calcination temperatures (600–900 °C) on physical characteristics and microstructure changes of low-grade clay containing 14.6% kaolinite and 17.8% 2:1 clay mineral. The pozzolanic activity of calcined low-grade clay as a supplementary cementitious material was evaluated using strength activity index and relative strength index. The results show that the kaolinite transformed from crystalline phase to amorphous metakaolin phase at 600 °C, while the particle size of clay first increases and then decreases. The optimal calcination temperature is found between 700 and 800 °C, whereas the optimal cement replacement level is 10–20 wt%.
Subject: calcined low-grade clay; supplementary cementitious material; pozzolanic reactivity; cement; microstructures
Identifier: http://hdl.handle.net/1959.13/1464468
Identifier: uon:47007
Identifier: ISSN:0950-0618
Language: eng
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