The primary goal of this study was to evaluate the use of Ultra-fine Drift Sand from the Yangtze River (China) in place of natural sand in the production of foamed concrete. The experimental design included factors with varying levels: the proportion of Ultra-fine Drift Sand at four levels (0 percent, 30%, 60%, and 100%). Ultra-fine Drift Sand was substituted in proportion to the mass of material. Each factor's effect on compressive strength, density (dry and saturated), air voids, and water absorption was assessed. According to the results, all factors had significant findings. The compressive strength of concrete increased due to an increase in curing time; fly ash content up to 30%; increasing the percent of Yangzi river sand; and decreasing slag. The mixture of 10% SF (Silica Fume), 24% FA (Fly Ash) and 100% YS (Yangzi soil) gives the enhanced results in concrete strength, by which it reaches about 7 MPa compared with other findings. The remaining percentages of mixing benefit compression strength results. This method of treatment provides an economical way through providing a cheap material that enhances the mechanical properties of concrete, provides a light weight concrete, and a good isolator material to improve the building's thermal insulation to reduce ecological problems and save energy. Doi: 10.28991/CEJ-2022-08-08-013 Full Text: PDF
This paper presents an experimental study of the effects of fly ash and ground granulated blast furnace slag (GGBS) on drying shrinkage of mortar. Two equations that can reasonably predict the drying shrinkage were also proposed. The test results reveal that mortar samples incorporating fly ash or GGBS exhibit greater lower drying shrinkage compared to the plain sample. The drying shrinkage decreases significantly with the increase in the fly ash content. While for GGBS, there is an optimal content of GGBS to restrain drying shrinkage. The prediction equations for the shrinkage strain of fly ash and GGBS mortar were proposed according to the dependent variable, which verified good accuracy compared to the test results.
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