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Utilization of Dredged River Sediment in Preparing Autoclaved Aerated Concrete Blocks

Kai Zhang1,2, Qunshan Wei1,2,*, Shuai Jiang3, Zhemin Shen4, Yanxia Zhang1,2, Rui Tang1,2, Aiwu Yang1,2, Christopher W. K. Chow5

1 College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China
2 State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai, 201620, China
3 National Engineering Research Center of Dredging Technology and Equipment, Shanghai, 200120, China
4 School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
5 Scarce Resources and Circular Economy (ScaRCE), UniSA STEM, University of South Australia, Mawson Lakes, SA 5095, Australia

* Corresponding Author: Qunshan Wei. Email: email

(This article belongs to the Special Issue: Recycled Concrete Towards a Sustainable Society)

Journal of Renewable Materials 2022, 10(11), 2989-3008. https://doi.org/10.32604/jrm.2022.019821

Abstract

In this study, the dredged river sediment, soft texture and fine particles, is mixed with other materials and transformed into eco-friendly autoclaved aerated concrete (hereinafter referred to as AAC) blocks. The results indicated the bricks produced under the conditions of 30%–34% dredged river sediment, 24% cement, 10% quick lime, 30% fly ash, 2% gypsum and 0.09% aluminum powder with 0.5 water to material ratio, 2.2 MPa autoclave pressure and 6 h autoclave time, the average compressive strength of 4.5 MPa and average dry density of 716.56 kg/m³ were obtained, the two parameters (strength & density) both met the requirement of national industry standard. At the same time, the contents of dredged river sediment, cement, lime, fly ash, gypsum and aluminum powder were 15%, 48%, 20%, 15%, 2% and 0.09%, respectively, and the non-AAC block made of 0.5 water to material ratio, the average compressive strength of 3.1 MPa and average dry density of 924.19 kg/m³ were obtained, the two parameters (strength & density) also met the requirement of national industry standard. In addition, the AAC block’s phase composition and morphology were micro-analyzed by SEM and XRD, the main substances in AAC block were found to be tobermorite and CSH, Among them, the chemical bond between Si-O-Si and Al-O-Al is broken, Al-O-Si is regenerated, Al substituted tobermorite with better strength is formed, and the compressive strength of AAC is further improved.

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APA Style
Zhang, K., Wei, Q., Jiang, S., Shen, Z., Zhang, Y. et al. (2022). Utilization of dredged river sediment in preparing autoclaved aerated concrete blocks. Journal of Renewable Materials, 10(11), 2989-3008. https://doi.org/10.32604/jrm.2022.019821
Vancouver Style
Zhang K, Wei Q, Jiang S, Shen Z, Zhang Y, Tang R, et al. Utilization of dredged river sediment in preparing autoclaved aerated concrete blocks. J Renew Mater. 2022;10(11):2989-3008 https://doi.org/10.32604/jrm.2022.019821
IEEE Style
K. Zhang et al., "Utilization of Dredged River Sediment in Preparing Autoclaved Aerated Concrete Blocks," J. Renew. Mater., vol. 10, no. 11, pp. 2989-3008. 2022. https://doi.org/10.32604/jrm.2022.019821



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