Abstract
Background: High permeable concrete is designed with high porosity, which allows water to pass through it. By considering this ability, it has been widely used for various applications including high permeable road pavement. However, to fully adopt highly permeable road pavement technology is challenging due to high cost and maintenance, besides the present engineers and contractors have insufficient expertise and experience with this technology. Henceforth, the high porosity property is highly favorable for road curb applications especially in the tropical region like Malaysia with high rainfall intensity. Objective: This paper aimed to determine the properties of the concrete experimentally, and propose the optimum mix design of high permeable concrete for road curb. Methods: The flow value and setting time of the cement paste were investigated. Next, the effects of the modified high permeable concrete with varying amount of crumb rubber on compressive strength, permeability and void ratio were also investigated. Results and Conclusion: Results have revealed that the workability of the cement paste increases when the water-binder ratio and the amount of fly ash increase. Meanwhile, an increasing amount of cement ratio and crumb rubber lowers the flow value and consequently leads to lower void ratio and permeability. Besides, it has been found that the higher the compressive strength, the lower the void ratio and permeability of the concrete. The research findings support that using an optimum amount of cement replacement with crumb rubber as an additive may increase the performance a high permeable concrete. Herein, the results indicate that the mix design of the concrete studied has the potential to be applied onto the road curb.
Highlights
High permeable concrete is a block of concrete made of a mixture of cement, water, coarse aggregate without or with a small number of fine aggregates
It has been found that the higher the compressive strength, the lower the void ratio and permeability of the concrete
The research findings support that using an optimum amount of cement replacement with crumb rubber as an additive may increase the performance of a high permeable concrete
Summary
High permeable concrete is a block of concrete made of a mixture of cement, water, coarse aggregate without or with a small number of fine aggregates. The application of high permeable road pavement allows water to penetrate through the concrete, indirectly reducing the risk of road flooding and improving the rate of recharge of groundwater and basins. It helps in improving the stormwater quality due to the stormwater runoff infiltration into the ground; the sediment is filtered which prevents contaminants from entering the groundwater which serves as a natural water filter for the environment. The high porosity property is highly favorable for road curb applications especially in the tropical region like Malaysia with high rainfall intensity
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