Sludge ash utilization and hydroplaning on concrete and asphalt pavements.
Item
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Title
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Sludge ash utilization and hydroplaning on concrete and asphalt pavements.
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Identifier
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AAI9510625
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identifier
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9510625
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Creator
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Afshari-Tork, Shahriar.
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Contributor
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Adviser: Reza M. Khanbilvardi
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Date
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1994
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Civil | Engineering, Mechanical | Engineering, Sanitary and Municipal
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Abstract
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A study was performed on samples of sludge ash taken from the Bergen Point Wastewater Treatment Plant to determine its utilization as an aggregate to be used in concrete and asphalt mixtures. The results of physical analyses indicated that the particle size distribution of ash resembles an aggregate comprised of approximately 60% sand and 40% silt. The ash has a low permeability, a relatively high shrinkage limit, and is free of organic matter. TCLP and EP-toxicity tests on ash samples showed that ash collected from Bergen Point is a non-hazardous material. Based on these results it was concluded that although the ash alone may not be a desirable construction material, blending it with other construction materials, such as concrete or asphalt, could reduce the adverse effects of the ash without diminishing the design properties of the concrete or asphalt mixes.;Laboratory scale tests were conducted on specimens with different percentage of ash as a partial replacement of the fine aggregates in both concrete and asphalt mixes. The results indicated that ash can replace fine aggregate up to 30% in concrete and up to 15% in asphalt mixes, without a significant adverse effect on strength, durability, and skid resistance of the product.;A hydroplaning study was also conducted on both ash-concrete and ash-asphalt pavements using a rainfall simulator. The results were compared with those for control no-ash mixes. No significant difference was found between hydrological parameters of ash-mixtures and those of the conventional mixes. In fact the introduction of ash into the asphalt and concrete mixes appeared to somewhat improve the process of surface water drainage. Runoff samples proved to be non-hazardous whether or not deicing material was used.;A field scale test was also conducted on ash-mix pavement sections and the results were compared with those for similar control no-ash mixes. Each pavement section was exposed to natural precipitation for a period of six months. The field study data supported the laboratory scale test results.;Analysis of the runoff-leachate samples from all pavement sections, with or without ash present, indicated compliance with current EPA groundwater standards.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
