Optimization of Compressive Strength and Porosity of Porous Concrete with the Addition of Zeolite as a Substitute for Sand and Silica Fume Kinanti Wijaya(a)- Andre Alfama Afrizal Nasution(b*)
(a, b) Faculty of Engineering, Universitas negeri Medan, Willem Iskandar Street Psr.V, Medan Estate, Indonesia.
*2001andrealfama[at]gmail.com
Abstract
Porous concrete is a type of concrete designed to allow water to flow through its pores, thereby reducing pooling and increasing water absorption into the soil. However, the use of porous concrete in road paving is still limited due to its low compressive strength. This study aims to determine the effect of adding zeolite as a sand substitute on the compressive strength and porosity of porous concrete containing silica fume. The study used variations in zeolite content of 12.5%, 17.5%, 22.5%, and 27.5% of the weight of fine aggregate, as well as a silica fume content of 7%. The test results show that variations in zeolite addition affect the compressive strength and porosity of concrete. The optimum variation was found at a zeolite content of 17.5% which provides an increase in compressive strength while maintaining a good level of porosity.
