Investigation of hydraulic conductivity and clogging of light permeable concrete containing Leica and Scoria

Document Type : Original Research

Authors
K. MOMENI 1
R. Ghavidel 2
1 Assistant Professor, Department of civil Engineering, Technical and Vocational TUV Tehran,Iran
2 Department of Civil Engineering, Islamic Azad University, Lasht Nasha Branch
Abstract
Pervious concrete is a concrete that, given its high porosity, allows higher rates of water infiltration through it. Although asphalt and concrete pavements have high structural and durability capabilities, they have a considerable high impact on the environment in terms of environmental as well as acoustic noise production. One of these problems are the drastic decrease in rainwater penetration to the ground and the consequent flooding disasters in the cities, which can lead to significant financial and life damage. On the other hand, surface clay pollution runoff can lead to clogging and take negative impact at effective permeability of such concrete. Thus making the most important feature of this concrete, which is high permeability, would be accompanied by some difficulties. In this study, using silica fume, it’s been tried to make a permeable concrete in order to have desirable mechanical properties, high permeability and less clogging. In addition, with the use of leca and scoria lightweight aggregates, the specific gravity of pervious concrete was significantly reduced to help noise pollution reduction by increasing internal and structural porosity. The results showed that the samples containing leca has a better performance in mechanical tests. Specimens containing scoria aggregates have higher porosity and permeability, which both have high importance in pervious concrete. Replacing 10% of cement by silica fume improved the mechanical properties of the specimens. In all cases, the samples showed acceptable permeability for slurry passage even at high concentrations, but the difference between the 10% clay suspension compared to clay-free water was significant, while the hydraulic conductivity decrease rate was much lower with increasing the concentration of clay.

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Modares Civil Engineering journal
Volume 20, Issue 3
September and October 2020
Pages 161-174