Performance Assessment of Warm Mix Asphalt (WMA) Pavements in Presence of Water by Using Nano scale Techniques, and Traditional Laboratory Tests
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| Language: | English |
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Ohio University / OhioLINK
2012
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1342814220 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-ohiou1342814220 |
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NDLTD |
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English |
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Civil Engineering Warm Mix Asphalt Moisture Damage Surface Free Energy and Nano Scale Techniques. |
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Civil Engineering Warm Mix Asphalt Moisture Damage Surface Free Energy and Nano Scale Techniques. Al-Rawashdeh, Abdalla S. Performance Assessment of Warm Mix Asphalt (WMA) Pavements in Presence of Water by Using Nano scale Techniques, and Traditional Laboratory Tests |
| author |
Al-Rawashdeh, Abdalla S. |
| author_facet |
Al-Rawashdeh, Abdalla S. |
| author_sort |
Al-Rawashdeh, Abdalla S. |
| title |
Performance Assessment of Warm Mix Asphalt (WMA) Pavements in Presence of Water by Using Nano scale Techniques, and Traditional Laboratory Tests |
| title_short |
Performance Assessment of Warm Mix Asphalt (WMA) Pavements in Presence of Water by Using Nano scale Techniques, and Traditional Laboratory Tests |
| title_full |
Performance Assessment of Warm Mix Asphalt (WMA) Pavements in Presence of Water by Using Nano scale Techniques, and Traditional Laboratory Tests |
| title_fullStr |
Performance Assessment of Warm Mix Asphalt (WMA) Pavements in Presence of Water by Using Nano scale Techniques, and Traditional Laboratory Tests |
| title_full_unstemmed |
Performance Assessment of Warm Mix Asphalt (WMA) Pavements in Presence of Water by Using Nano scale Techniques, and Traditional Laboratory Tests |
| title_sort |
performance assessment of warm mix asphalt (wma) pavements in presence of water by using nano scale techniques, and traditional laboratory tests |
| publisher |
Ohio University / OhioLINK |
| publishDate |
2012 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1342814220 |
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AT alrawashdehabdallas performanceassessmentofwarmmixasphaltwmapavementsinpresenceofwaterbyusingnanoscaletechniquesandtraditionallaboratorytests |
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ndltd-OhioLink-oai-etd.ohiolink.edu-ohiou13428142202021-08-03T05:47:33Z Performance Assessment of Warm Mix Asphalt (WMA) Pavements in Presence of Water by Using Nano scale Techniques, and Traditional Laboratory Tests Al-Rawashdeh, Abdalla S. Civil Engineering Warm Mix Asphalt Moisture Damage Surface Free Energy and Nano Scale Techniques. <p>Warm Mix Asphalt (WMA) was introduced in Europe in 1995. WMA is gaining attention because it offers several advantages over Hot Mix Asphalt (HMA). The advantages include (1) reduced energy consumption in the asphalt mixture production process; (2) reduced emissions, fumes, and undesirable odors; (3) reduced binder aging;and (4) extended construction season in temperate climates.</p><p>Moisture damage can be defined as the effect of environmental factors such as water, temperature, and air on the performance of asphalt concrete pavement. The asphalt mix consists of aggregate (in different sizes) and asphalt binder being compacted to a specified air void ratio. Due to traffic load with existence of water, asphalt concrete mix will start to lose adhesion between aggregate and binder or lose cohesion within the binder itself.</p><p>The main objective of this study is to assess the performance of WMA and HMA in presence of water by using nano scale techniques and Surface Free Energy (SFE)concepts, and then compare the results with asphalt pavement traditional laboratory tests.</p><p>In this study, the bitumen’s main functional groups were determined by using Fourier Transform Infrared (FTIR) Spectroscopy. The mineral compositions of aggregate were analyzed by using X-Ray diffraction (XRD) technique. Atomic Force Microscopy (AFM) was used to measure the surface free energy of aggregate and asphalt binder. It can also be used to make a high quality (Three Dimensional) images for smooth and leveled surfaces. Asphalt mix samples were prepared in the laboratory using Superpave Gyratory Compactor (SGC) with different thicknesses and diameters. Half of the asphalt mix samples were conditioned to study the effect of moisture on the performance of the mix. Air void structure and aggregate orientation of the asphalt mix were examined by using X-Ray Computed Tomography (X-Ray CT). X-Ray CT images were analyzed by using computer software called AVIZO Fire (version 6.3) to measure the air void ratio, void sizes, and void distribution.</p><p>Simple Performance Tester (SPT) was used to perform dynamic modulus test. The test was performed on both unconditioned and conditioned samples to compare the results. MTS machine was used to perform the Indirect Tensile Strength (ITS) on the unconditioned and conditioned asphalt mix samples. Thermal cracking temperature for compacted asphalt sample was determined by using Asphalt Concrete Cracking Device (ACCD). The permanent deformation (Rutting) of asphalt concrete was determined by using Asphalt Pavement Analyzer (APA). Based on the traditional laboratory test results, all mixes are high resistant to moisture damage with slight differences in the performance of HMA over WMA.</p><p>Dynamic modulus test results were used as inputs to find the relaxation modulus and creep compliance. Two asphalt mixes from two different plants in the state of Ohio were evaluated. </p><p>Based on the traditional laboratory tests results, the performance of the HMA was higher than the WMA for each project and this is can be caused by the foaming process. Ohio foaming process consists only of one stage where the foamed hard binder is introduced to the mixture to decrease the mixing temperature. Ohio-Foam’s system willincrease the void ratio of the asphalt mix and more water will be trapped within the aggregate-binder interface. To reduce the voids in the WMA, regular HMA can be used to remove the city water from the mixing process, replace Ohio-Foam’s system with the soft-hard binder foaming process, or another foaming WMA technique can be used such as Advera. The performance of the asphalt mixes from Columbus, Oh was higher than the performance of the asphalt mixes from Woodville, Oh and this is can be caused by the mineralogical composition of the aggregates. Columbus aggregates contains more silica (SiO2) than Woodville aggregates and based on AFM results, it was clear that the sandstone (more silica SiO2) is better than limestone in terms of providing greater adhesion energy with the binder. To enhance a better performance of Woodville HMA and WMA, a different aggregate source can be used.</p> 2012-09-11 English text Ohio University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1342814220 http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1342814220 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |