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MAGNESIUM OXYCHLORIDE CEMENT-BASED COMPOSITES WITH FLY ASH ADMIXTURE
Abstract
Magnesium oxychloride (MOC) cement-based composites were studied in the presented paper. As filler, silica sand was used and partially replaced with fly ash from coal combustion. First, the chemical composition and basic physical properties of raw materials were tested. For the hardened composites, bulk density, specific density, and total open porosity were measured. Among mechanical parameters, flexural and compressive strengths were determined. The thermal performance of composites was studied using a transient impulse method and the assessed parameters were thermal conductivity, thermal diffusivity and volumetric heat capacity. The workability of fresh composite mixtures was obtained using a flow table test. The use of fly ash led to the significant decrease in porosity compared to the control materials with silica sand as only filler which ensures the durability of examined materials in the sense of moisture related damage. The mechanical parameters of all developed materials were high. The compressive strength was slightly improved by the 5% replacement of sand. On the other hand, the flexural strength was reduced for fly ash-modified composites. It clearly proved assumption of filler function of fly ash. The thermal insulation properties remained almost unaffected by fly ash incorporation. It was concluded, the developed composites represent alternative low-carbon materials possessing interesting functional properties for construction practice. Moreover, the use of fly ash can be considered as an environmentally friendly solution for production of sustainable building materials.
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References3
Bhagatg Singh, G.V.P.; Subramaniam, K.V.L. Production and characterization of low-energy Portland composite cement from post-industrial waste, J. Clean. Prod. 2019, 239, 118024.
Souto-Martinez, A.; Arehart, J.H.; Srubar, W.V. Cradle-to-gate CO2 emissions vs. in situ CO2 sequestration of structural concrete elements, Energy Build. 2018, 167, 301-311.
Boesch, M.E.; Koehler, A.; Hellweg, S. Model for cradle-to-gate life cycle assessment of clinker production, Environ. Sci. Technol. 2009, 43, 7578-7583.
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Number of times cited according to Crossref: 4
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