Recently, many people around the world have been concerned with environmental protection\nand sustainability. The goal of various countriesâ?? research has been focused on how to regenerate existing\nresources. Circulation fluidized bed combustion (CFBC) technology is one of the emerging combustion\ntechnologies for electricity generation and produces more than 800,000 tons of CFBC fly ash (CFA)\nper year for combustion. CFA has been widely applied in cement additive, new building materials\nand cement-based materials. The goal of this study was to discuss the engineering properties of\nroller-compacted concrete containing CFA. Test subjects included compressive strength, flexural\nstrength, absorption, setting time, unit weight, sulfate resistance, SEM microscopic observations and\nXRD ingredient analysis. Test results indicate the following: (1) using CFA as a substitute of fine\naggregates up to 10 wt.% would improve the development of later flexural strength; (2) the increases\nin pre-pressure would increase the compressive strength and unit weight and decrease absorption;\n(3) using CFA would reduce the initial setting time by 30%â??60% and reduce the final setting time\nby 16%â??20%; (4) using CFA would reduce the absorption; (5) using CFA would reduce the unit \nweight by 0.5%â??2.8%, and the increases in pre-pressure would increase the unit weight by about\n0.9%â??2.1%; (6) CaO in CFA helps to improve sulfate resistance; (7) scanning electron microscopy\n(SEM) observation shows that the increases in pre-pressure would reduce the pores; and (8) X-ray\ndiffraction (XRD) analysis shows that the inclusion of CFA would increase the content of Ca(OH)2\nin concrete.
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