Mechanical properties of pervious concrete with slag and silica fume as cement substitution for highway shoulder

Nowadays, the rapid of road construction is not comparable to availability of cement materials. Meanwhile, there are cementitious materials from waste and by-product such as slag and silica fume that can replace the using of cements in concrete mixture. The high silica content in slag and silica fume can increasing the strength of concrete mixture. This study aims to obtain the mechanical properties of pervious concrete using slag and silica fume as cement substitution. The values of the mechanical properties are used for the design of highway shoulder. Two aggregate sizes were investigated in this paper. The binder materials for mixtures is a combination between cement, slag, silica fume and fly ash. Based on the research results, the highest compressive strength of 12.5 mm - 9.5 mm sample is 12.60 MPa, while the highest compressive strength of 9.5 mm - 4.75 mm sample is 13.25 MPa. The highest coefficient of permeability of 12.5 mm - 9.5 mm sample is 1.219 cm/sec and the highest coefficient of permeability of 9.5 mm 4.75 mm sample is 0.865 cm/sec. The highest porosity of 12.5 mm - 9.5 mm sample is 24.41 % and the highest porosity of 9.5 mm - 4.75 mm sample is 23.04 %. Based on the data of the mechanical properties obtained, it can be concluded that using slag and silica fume as cement substitution for a pervious concrete are increasing compressive strength but decreasing coefficient of permeability and porosity.