Formulation of Non-Fired Bricks Made from Secondary Aluminum Ash
Source abstract
Abstract
The secondary aluminum ash is the black slag left after the primary aluminum ash is extracted from the metal aluminum. To address the environmental pollution and resource waste caused by the accumulation and landfill of aluminum ash, this study fabricated non-fired bricks by using secondary aluminum ash as the principal raw material, which was supplemented by cement, slaked lime, gypsum and engineering sand. The effects of mix proportions of various admixtures on the mechanical properties of non-fired bricks were investigated, and on this basis, the hydration mechanism was analyzed. The results showed that the mix proportions were 68.3% aluminum ash, 11.4% cement, 6.4% slaked lime, 4.2% gypsum and 9.7% engineering sand. The compressive strength of the fabricated bricks reached 22.19 MPa, and their quality indicators were in line with the MU20 requirements for Non-fired Rubbish Gangue Bricks. Evident hydration reaction occurred inside the non-fired bricks, with main products being calcium silicate hydrate (CSH), calcium aluminate hydrate (CAH) and ettringite (AFt). Besides, a dense structure was formed, which enhanced the brick strength.
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Research context
OpenAlex topics: Bauxite Residue and Utilization · Recycling and utilization of industrial and municipal waste in materials production · Concrete and Cement Materials Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Mechanical Engineering, Nantong University, Nantong 226019, China
Jiangsu Province Engineering Research Center of Aluminum Dross Solid Waste Harmless Treatment and Resource Utilization, Nantong 226019, China
Funding
Priority Academic Program Development of Jiangsu Higher Education Institutions · Jiangsu Province Policy Guidance Program (International Science and Technology Cooperation) Project · Key R&D Projects of Jiangsu Province
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