Abstract:

In the presented study, the effects of Glass Powder (GP) and/or Ground Granulated Blast Furnace Slag (GGBFS) substitutions in different proportions in place of cement in Ultra High Performance Concrete (UHPC) mixtures with and without steel fiber were parametrically investigated by the compressive strength. In this context, the total of 16 group UHPC specimens consisting of single and dual-uses of GP and GGBFS of 12.5% and 25% by weight in place of the cement as well as additive-free control mixture were produced for the concrete mixture where the total amount of binder is 1000kg/m3. However, same number of the test specimens were also prepared by inclusion of straight steel fibers of 1.0 vol%. Based on uniaxial compression tests conducted at the concrete ages of 7, 14, 28, 56 and 90 days, the results with regard to independent and combined uses of GP and GGBFS were discussed by referencing the control mixture. The parametric investigations indicated that the target compressive strengths of UHPC can be obtained with the partial substitution of GP or GGBFS up to 25% by weight. Not only the compressive strengths were negatively affected by the dual-uses of GP and GGBFS, but also high amount of additive materials led to rapidly strength losses. The effect of steel fibers on the compressive strength became more important with the additive use in higher proportions.

Keywords: