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Open AccessArticle

Effect of the Content of Micro-Active Copper Tailing on the Strength and Pore Structure of Cementitious Materials

1
Jiang Xi Buidings Materials Scientific Research & Design Institute, Nanchang 330001, China
2
Department of Civil Engineering, Tsinghua University, Beijing 10084, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(11), 1861; https://doi.org/10.3390/ma12111861
Received: 5 May 2019 / Revised: 1 June 2019 / Accepted: 5 June 2019 / Published: 9 June 2019
(This article belongs to the Special Issue Sustainability in Construction and Building Materials)
This study investigates the effect of micr-oaggregate filling with copper tailing on the pore structure of cement paste containing copper tailing (CPCT). The particle size of the CPCT and the pore structure of CPCT were analyzed by laser particle size analysis and mercury instruction porosimetry (MIP). Results showed that at the early stage of curing time, with increasing copper tailing content, the compressive strength of cement mortar with copper tailing (CMCT) was lower, and the porosity and pore diameter of CPCT were higher and greater; with the extension of curing age, when the content of copper tailing was less than 30%, the compressive strength of CMCT and the porosity of CPCT changed slightly with the increase of the content of copper tailing. However, the maximum hole diameter of CPCT decreased gradually (a curing age between 7 d and 365 d under standard conditions). Scanning electron microscopy analysis showed that at the early stage of cement hydration in the CPCT, the copper tailing did not fill the pores in CPCT well, while in the later stage of cement hydration, the microaggregates of copper tailing filled the pores well and closely combined with the surrounding hydration products. In the later stage of cement hydration, the microaggregate filling of copper tailing was primarily responsible for the strength increase of the CMCT. View Full-Text
Keywords: copper tailing; pore structure; microaggregate filling; compressive strength; particle size distribution copper tailing; pore structure; microaggregate filling; compressive strength; particle size distribution
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MDPI and ACS Style

Zhang, L.; Liu, S.; Song, D. Effect of the Content of Micro-Active Copper Tailing on the Strength and Pore Structure of Cementitious Materials. Materials 2019, 12, 1861.

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