Preparation and Properties of Autoclaved Aerated Concrete Using Coal Gangue and Fly Ash
WANG Changlong1,2,3, ZHANG Kaifan1, ZUO Wei4, YE Pengfei1, ZHAO Gaofei1, REN Zhenzhen1, LIN Geng5
1 School of Civil Engineering, Hebei University of Engineering, Handan 056038, China 2 Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources, Shangluo University, Shangluo 726000, China 3 Tianjin Sunenergy Sega Environmental Science & Technology Co. Ltd, Tianjin 300380, China 4 Beijing Institute of Hydraulic and Environmental Geological Survey, China Coal Geology Group Co., Ltd., Beijing 100040, China 5 School of Chemistry and Chemical Engineering, Xi′an University of Science and Technology, Xi′an 710054, China
Abstract: In this paper, a new type of autoclaved aerated concrete (AAC) was developed using coal gangue and fly ash. The calcination temperatures of the coal gangue, effect of coal gangue content on physical and mechanical properties of AAC, and phase composition and microscopic morphology of AAC were analyzed using X-ray diffraction (XRD), and scanning electron microscope (SEM). And the result shows that 600 ℃ is the optimal calcination temperature, AAC with bulk density of 588 kg/m3 and strength of 3.65 MPa, which can reach the requirements of A3.5, B06 level of AAC product regulated by “autoclaved aerated concrete block” GB 11968-2006. After static curing, the hydration products in AAC body were ettringite (AFt), tobermorite, C-S-H gels and hydrated garnet; during the autoclaving, AFt was decomposed and more tobermorite formed coupled with C-S-H gels and hydrated garnet.
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2020, Vol. 34 
