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    Air permeability of asphalt concrete made with shredded-tire rubber-modified binders and its relationship with porosity
    (AMER SOC TESTING MATERIALS, 2005) Celik, ON
    Permeability of bituminous mixtures has been recognized as an important parameter that affects directly the performance and durability of materials. The permeability of bituminous mixtures and their durability are assumed to be more or less proportional to the porosity. Some researchers suggested that the permeability of bituminous mixtures is a better indicator of durability than the porosity, because permeability measures the capacity of the porous medium to transmit fluids, while porosity says nothing about their exposure to the forces producing disintegration. Ideally. a mix should contain disconnected voids. Dimensions of the individual voids and their lack of interconnection could produce a specimen whose void content is relatively high but of low permeability. A wearing course with low permeability will resist the ingress of air and water and hence will slow down the process of binder hardening due to oxidation and evaporation. This paper presents the relationship between the measured permeability values using the Leeds Air Permeameter and measured porosity values of asphalt concrete made with different binders.
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    Porosity of asphalt concrete made with waste shredded-tire rubber-modified binders
    (AMER SOC TESTING MATERIALS, 2004) Celik, ON
    Most bituminous paving researchers agree that high air void content (high permeability) should be avoided in the design and construction of bituminous pavements. Void content in bituminous mixtures is one of the main approaches in determining the optimum binder content. The current design procedures and the Leeds design method provide an approach to determination of the air voids in bituminous mixtures. Because the determination of porosity in bituminous mixtures is based on a calculated value, which is dependent on the accuracy of the mix composition, it is difficult to use porosity as a crucial parameter for acceptance of constructed bituminous pavements. In fact, porosity measurements are often the source of dispute and disagreement between contractor and engineer. For this reason, it is important to develop methods for the direct measurement of porosity in the laboratory so that verification in the field can be made independent of the compaction of the mix. This paper introduces a new porosity measuring procedure based on the Leeds vacuum porosity meter and presents the results obtained from this apparatus for asphalt concrete made with shredded-rubber modified binder.