@Article{jrm.2022.019821,
AUTHOR = {Kai Zhang, Qunshan Wei, Shuai Jiang, Zhemin Shen, Yanxia Zhang, Rui Tang, Aiwu Yang, Christopher W. K. Chow},
TITLE = {Utilization of Dredged River Sediment in Preparing Autoclaved Aerated Concrete Blocks},
JOURNAL = {Journal of Renewable Materials},
VOLUME = {10},
YEAR = {2022},
NUMBER = {11},
PAGES = {2989--3008},
URL = {http://www.techscience.com/jrm/v10n11/48722},
ISSN = {2164-6341},
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.},
DOI = {10.32604/jrm.2022.019821}
}