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Utilization of dredged river sediment in Preparing Autoclaved Aerated Concrete Blocks

Journal of Renewable Materials 2022年第11期10卷 2989-3008页

作者： Kai Zhang Qunshan Wei Shuai Jiang Zhemin Shen Yanxia Zhang Rui Tang Aiwu Yang Christopher WKChow College of Environmental Science and Engineering Donghua UniversityShanghai201620China State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry Donghua UniversityShanghai201620China National Engineering Research Center of Dredging Technology and Equipment Shanghai200120China School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai200240China Scarce Resources and Circular Economy(ScaRCE) UniSA STEMUniversity of South AustraliaMawson LakesSA 5095Australia

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)*** 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/m³were obtained,the two parameters(strength&density)both met the requirement of national industry *** 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/m³were obtained,the two parameters(strength&density)also met the requirement of national industry *** 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.

关键词： Autoclaved aerated concrete dredged river sediment compressive strength frost-resistance moisture content microstructure

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