Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 104, Issue -, Pages 109-115Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2015.12.041
Keywords
Thermal treatment; Concrete; X-ray diffraction; Mechanical properties; Waste management
Categories
Funding
- National Key Technology RD Program [2014BAE05B00]
- China Postdoctoral Science Foundation [2015780095, 2015M580106]
- Natural Science Foundation of Hebei Province [E2015402057]
- State Key Laboratory of Solid Waste Reuse for Building Materials [SWR-2014-007]
- Comprehensive Utilization of Tailing Resources Key Laboratory of Shaanxi Province [2014SKY-WK010]
- Construction Science and Technology Foundation of Hebei Province [2012-136]
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In this paper a new type of autoclaved aerated concrete (ACC) was developed using coal gangue (CGC) and iron ore tailings (ITOs). The material compositions, calcination temperatures of the coal gangue, and the composition of the hydration products were analysed using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and scanning electron microscope (SEM). The optimal thermal activation temperatures and the activation mechanisms of the calcined coal gangue were also studied. The results indicated that the optimal calcination temperature of coal gangue was approximately 600 degrees C. The bulk density and compressive strength of MC were approximately 609 kg m(-3) and 3.68 MPa, respectively, which passed the requirements of A3.5, B06 level of AAC sample regulated by GB/T 11969-2008. Before the autoclaving, the hydration products in ACC containing CGC and ITOs were tobermorite, hibschite, ettringite, and C-S-H gel; during the autoclaving, ettringite was decomposed and more tobermorite formed coupled with C-S-H gel and hibschite. (C) 2015 Published by Elsevier Ltd.
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