1 College of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China 2 State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control, Wuhan University of Science and Technology, Wuhan 430081, China 3 Ushin Jiangsu Engineering Technology Co., Ltd., Suzhou 215000, Jiangsu, China
Abstract: The autoclaved aerated concrete (AAC) was prepared with waste concrete (WC) and waste clay bricks (CB) as the main raw materials. The influences of WC, CB and compound addition amounts on the compressive strength and dry bulk density of autoclaved aerated concrete were studied. The phase compositions and microscopic morphology of the AAC samples were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results showed that the compressive strength and dry bulk density of the AAC prepared with WC or CB, respectively, could meet the requirements for A5.0 B07 grade of autoclaved aerated concrete block (GB11968-2020) as the addition amount of construction waste ranged from 50wt% to 60wt%. The properties of AAC prepared with compounding WC and CB were improved, as the mass ratio of WC to CB (m(WC)∶m(CB)) decreased, the compressive strength of the AAC samples persistently increased, while the dry bulk density firstly decreased and then increased. When the m(WC)∶m(CB) was in the range of 2∶3—3∶2, the compressive strength and dry bulk density of the samples could meet the requirements for A5.0 B06 grade of autoclaved aerated concrete block (GB11968-2020). During the autoclave curing process, the SiO2, Al2O3, Ca(OH)2, feldspar, calcium-rich calcium silicate hydrate (α-C2SH) in the green body interreacted to generate a large amount of flaky tobermorite, semicrystalline CSH (I), CSH gel, and a small amount of hydrogarnet, anhydrite, together with residue quartz and calcite of raw materials, filled with the gaps in the hole wall and staggered together to form a certain porous and framework hierarchy, improved the strength and reduced the density of AAC. The samples prepared with compounding WC and CB contained more well-crystallized tobermorite, CSH (I), and moderate CSH gel to form dense network structure, favored the better properties of AAC.
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2024, Vol. 38 
