Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 254, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2020.119259
Keywords
Iron tailings powder; Cement; Nano-clay; Composite materials; Mechanical behavior; Micro-scale investigation
Categories
Funding
- National Natural Science Foundation of China [41772311, 51568044]
- Zhejiang Provincial Natural Science Foundation of China [LY17E080016]
- Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Science [Z017013]
- Scientific Research Projects of Zhejiang Department of Housing and Urban and Rural Construction [2017K179]
- International Scientific and Technological Cooperation Projects of Shaoxing University [2019LGGH1007]
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In order to examine the mechanical performance of iron tailings powder (ITP) with compound admixture of cement and nano-clay, the mixture ratio of different cement and nano-clay is designed to prepare two kinds of ITP-based materials. The first kind ITP-based material is ITP mixed with 5%, 10%, 20% and 30% cement, and the second kind ITP-based material is the first kind materials mixed with 10% cement and 5% or 10% nano-clay. The unconfined compression strength (UCS) test, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) of two kind materials are measured with 7 days and 28 days curing periods, respectively. Results of the UCS test showed that cement and nano-clay are all beneficial for enhancing the UCS of iron tailings powder. When 5-10% nano-clay is substituted for 10% cement, the enhancement in the unconfined compression strength of cement iron tailings powder is nearly similar. Micro-test results showed that the increase in strength could be due to the involvement of cement in the hydration. The main function of nano-clay is to make the microstructure more compact owing to its small particle size. (C) 2020 Elsevier Ltd. All rights reserved.
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