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Dr. Taha Awad Allah El-Sayed Ibrahim :: Publications:

Title:
ENHANCEMENT OF PROPERTIES OF POROUS CONCRETE THROUGH MIX DESIGN
Authors: N M Nofal, G A Hamdy, Taha A. Ibrahim, S M Gamal
Year: 2017
Keywords: Porous concrete, Mix design, Permeability, Porosity, Sustainable concrete
Journal: Jokull Journal
Volume: 67
Issue: 7
Pages: 203-220
Publisher: Jokull Journal
Local/International: International
Paper Link:
Full paper TAHA AWAD ALLAH EL-SAYED IBRAHIM_Paper_15.pdf
Supplementary materials Not Available
Abstract:

Porous concrete has an interconnected pore structure that freely allows the passage of water to flow through. This type of concrete can be applied for pavements of parking lots, sewage treatment plant sludge beds, swimming pool deck, bridge embankments and floors for zoo area and animal barns. It may also be used in applications requiring light-weight concrete. This paper presents an experimental program conducted with the objective of enhancing the engineering properties of porous concrete. Mixtures were designed based on cement paste / total aggregate ratio. Twelve mixes were cast and tested. The mixes were divided into 5 groups: group A had cement paste/aggregate ratios of 0.20, 0.30, and 0.40 for the three mixtures 1,2 and 3, respectively; group B used partial replacement of coarse aggregates by 8% and 12% sand; in group C cement was partially replaced by 8% and 12% silica; in group D cement was partially replaced by 12% and 20% fly ash and finally in group E fibrillated polypropylene fiber was added to the mix by 0%, 0.1% and 0.2% . For groups B, C, D and E the cement paste/aggregate ratios was 0.40, water / cement ratio was 0.27 for the mixes. A large number of test specimens were prepared to perform the required tests. Tests were carried out on fresh concrete to evaluate density, slump and compaction index. Tests conducted on hardened concrete were compressive strength, splitting tensile strength, flexure strength, permeability, as well as flow rate. The test results demonstrated the influence of mix proportions on the physical and mechanical strength of pervious concrete. Results indicated the possibility to produce porous concrete mixture with acceptable permeability and concrete strength through careful mix design.

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