Nano-treatment of Autoclaved Aerated Concrete Waste and Its Usage in Cleaner Building Materials
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https: //doi. org/10.1007/s11595-020-2321-6
Nano-treatment of Autoclaved Aerated Concrete Waste and Its Usage in Cleaner Building Materials WANG Tao1, HE Xingyang2*, YANG Jin2*, ZHAO Huang1, SU Ying2
(1. China Construction Third Bureau Green Industry Investment Co., Ltd, Wuhan 430100, China; 2. School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, China)
Abstract: Autoclaved aerated concrete waste (AACW) was used as a raw material to prepare nucleation seed for acceleration of Portland cement. Nano AACW seed with median particle size of 324 nm was prepared by wet grinding method. Both the electrical conductivity and pH value of nano AACW suspension were obviously improved. Both the setting times and intensity of the main hydration heat peak were promoted by nano AACW, indicating the possibility of AACW suspension as nucleation seed. The early age compressive strength before 3 days was also clearly improved by nano AACW, with no negative effect on the late age strength. Furthermore, the reduced CH content with dosage of nano AACW indicates that nano AACW not only plays a role of nucleation seed in cement hydration, but also has a certain pozzolanic reaction. Key words: autoclaved aerated concrete waste; construction and demolition waste; wet grinding; nano technology; nucleation seed
1 Introduction Construction and demolition (C&W) waste refers to the spoil, waste and other wastes generated during the construction, reconstruction and demolition of various types of construction and municipal infrastructure projects. In recent years, with the rapid development of urbanization in China, C&W waste has been produced in large quantities. The annual generation of C&D wastes has reached 2 billion tons, which is about 10 times the amount of domestic garbage generated, accounting for about 40% of the total amount of urban solid wastes. The C&D waste has become the largest and most concentrated solid waste discharged by a single species in China. At present, C&D waste in China is mainly handled by means of landfill and open-air stack, which will not only occupy land resources, but also cause series of environmental problems. C&D waste typically includes waste concrete, © Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature 2020 (Received: Mar. 21, 2020; Accepted: May 28, 2020) WANG Tao(王涛): Senior Engineer; E-mail: 447965477@ qq.com *Corresponding authors: HE Xingyang(贺行洋): Prof.; E-mail: [email protected]; YANG Jin(杨进): Lecturer; E-mail: jinyang@ hbut.edu.cn Funded by the National Key Research and Development Program of China (2019YFC1907103), the National Natural Science Foundation of China (51902095) and the Major Technology Innovation of Hubei Province (2019ACA146)
brick, glass, ceramic, asphalt, etc[1]. The recycling of C&D waste in construction and building materials has attracted worldwide interest and attention[2], such as recycled concrete aggregate[3], substitution material for cement binder[4] and road bases material[5]
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