Effect of Fly Ash and Ground Granulated Blast Furnace Slag on The Strength of Concrete Pavement

Abstract

In this study, the effects of Fly Ash (FA) and Ground Granulated Furnace Slag (GGBFS) on design of concrete pavement are investigated. It has been observed how these mineral additives change the 7 days compressive strength and splitting tensile strength of the concrete pavement, the 28 days compressive strength, splitting tensile strength and bending strength of concrete pavement. The cement dosage is 350 kg/m3 and water/cement ratio is 0.42. Three concrete mixture are produced. The first concrete mixture does not contain FA and GGBFS (reference concrete). The second concrete mixture contains 20 percent of the Portland cement is replaced with fly ash. Finally, the third concrete contains GGBFS displaced at the rate of 20% with cement. Three different molds are used in experiments. The first is cubic mold whose dimensions are 150 mm. The second is cylinder mold whose diameter and length are 150 mm and 300 mm, respectively. Finally, the third is beam mold whose dimension of cross-section and length are 150 mm x150 mm, and 550 mm, respectively. The study was carried out according to the Specifications of General Directorate of Turkish Highways (GDTH) (2016).