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Abbas Booshehrian

Bio: Abbas Booshehrian is an academic researcher from University of Massachusetts Dartmouth. The author has contributed to research in topics: Falling weight deflectometer & Ferrocement. The author has an hindex of 11, co-authored 17 publications receiving 677 citations. Previous affiliations of Abbas Booshehrian include Sharif University of Technology & University of Massachusetts Amherst.

Papers
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Journal ArticleDOI
TL;DR: The main focus of as mentioned in this paper was to obtain plant produced Reclaimed Asphalt Pavement (RAP) mixtures, to document the mixture production parameters and to evaluate the degree of blending between the virgin and RAP binders.
Abstract: The main focus of this study was to obtain plant produced Reclaimed Asphalt Pavement (RAP) mixtures, to document the mixture production parameters and to evaluate the degree of blending between the virgin and RAP binders. The effect of mixture production parameters on the performance (in terms of stiffness, cracking, rutting, and moisture susceptibility) and workability of the mixtures was evaluated. Eighteen plant produced mixtures were obtained from three locations in the Northeast United States. RAP contents (zero to 40%) were varied and softer binders were used. The data and analysis illustrated that the degree of blending between RAP and virgin binders is a function of production parameters. The stiffness of the mixtures increased as the percentage of RAP increased, but not when the discharge temperatures of the mixtures were inconsistent. The cracking resistance was reduced as the percentage of RAP increased. The rutting and moisture damage resistance improved as the percentage of RAP in the mixture...

246 citations

Journal ArticleDOI
TL;DR: In this article, the authors examined if asphalt rejuvenators can offset the stiffness attributed by the hardened binder from reclaimed asphalt pavement (RAP) and reclaimed asphalt shingles (RAS) in mixtures that incorporate high RAP and RAS content without adverse impact on the performance of the mixtures.
Abstract: The objective of this study was to examine if asphalt rejuvenators can offset the stiffness attributed by the hardened binder from reclaimed asphalt pavement (RAP) and reclaimed asphalt shingles (RAS) in mixtures that incorporate high RAP and RAS content without adverse impact on the performance of the mixtures. Also, to assess, if rejuvenators can help the hardened binder from the RAP/RAS comingle with the virgin binder. Overall, the results showed that asphalt rejuvenators can mitigate the stiffness of the resultant binder. The cracking characteristics of the mixture improved by the addition of the rejuvenators, however, the rutting and moisture susceptibility were adversely impacted at the dosage and the testing conditions used. Also, the tests results at 4°C generally showed that there was blending of the rejuvenated and virgin binder, however, no conclusion could be made at the higher temperatures.

182 citations

Journal ArticleDOI
TL;DR: In this article, the authors presented a methodology for constructing asphalt binder master curves in a step-by-step format and evaluated the degree of blending between aged and virgin binder.
Abstract: The master curve of an asphalt binder provides a relationship between the binder stiffness and reduced frequency over a range of temperatures and frequencies. Accordingly, the master curve makes it possible to predict viscoelastic properties over a wide frequency range and also to predict viscoelastic properties at any temperature. To construct a master curve, the stiffness of an asphalt binder at multiple temperatures and frequencies is measured. The data are then fitted into a viscoelastic model applied to asphalt binders. Recently, a methodology has been developed that utilizes the measured dynamic modulus of a hot-mix asphalt (HMA) mixture and the master curves for the as-recovered binders to determine the degree of blending between aged and virgin binders in asphalt mixtures that incorporates recycled materials. This study presents the methodology for constructing asphalt binder master curves in a step-by-step format. The study also describes in a step-by-step format the methodology for evaluating the degree of blending between aged and virgin binder. Furthermore, to clarify the method and elaborate on the analysis of experimental results, plant-produced mixtures containing different percentages of recycled asphalt pavement (RAP) were obtained and tested. The test results were used to develop the master curves and examine the degree of blending by the aid of the methodology explained in the paper.

77 citations

Journal ArticleDOI
TL;DR: In this paper, the microstructural and mechanical properties of recycled concretes were enhanced by the use of silica nano-particles in low contents (lower than 5%).
Abstract: Nowadays, applying sustainable development strategies in designation and production of various products has attracted specific attention. In order to consider ecological sustainable development for a product, reducing its environmental impacts should be observed. Concrete technology and its products are not exceptions, and therefore, the same has been a concern for concrete industry. Alongside, concrete recycling is one of the measures used to reduce the environmental impacts of concrete products during their life cycle. On the other side, positive performance of silica nano-particles has been proven in numerous researches as one super pozzolanic material. Hence, in this study, we aimed on application of recycled coarse aggregates as 100% replacement for natural coarse aggregate. Meanwhile, due to strength loss of recycled concretes, we tried to enhance the microstructural and mechanical properties of recycled concretes by the use of silica nano-particles in low contents (lower than 5%). To provide a more comprehensive investigation, mixtures with different cement contents (350, 400, 450 kg/m3) were casted. By examining the experimental data deduced from different tests consisting of slump, compressive strength, water absorption, and microstructure (SEM), the positive effects of this method was discovered. Finally, some procedures for improving the present condition are expressed.

76 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the mechanical properties (compressive and flexural strengths) and microstructural properties (as determined by scanning electron microscopy) of the interfacial transition zone between cement pastes and aggregates of mortars applicable for the casting of thin ferrocement elements combining with nanosilica.
Abstract: Because of their unique physical and chemical properties, nanoparticles have been gaining increasing attention and have been used in many fields to fabricate new materials with novel functions. If nanoparticles are integrated with cement-based building materials, the new materials might possess some outstanding properties. Ferrocement is a type of thin-wall reinforced concrete commonly constructed of hydraulic cement mortar reinforced with closely spaced layers of continuous and relatively small-sized wire mesh. The low level of technical skill required to make ferrocement and the ready availability of its materials make ferrocement suitable for a wide variety of applications. This study investigates the mechanical properties (compressive and flexural strengths) and microstructural properties (as determined by scanning electron microscopy) of the interfacial transition zone between cement pastes and aggregates of mortars applicable for the casting of thin ferrocement elements combining with nanosilica. St...

67 citations


Cited by
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01 Jan 2016
TL;DR: The properties of concrete is universally compatible with any devices to read, and is available in the digital library an online access to it is set as public so you can download it instantly.
Abstract: Thank you for downloading properties of concrete. As you may know, people have look hundreds times for their chosen readings like this properties of concrete, but end up in malicious downloads. Rather than reading a good book with a cup of coffee in the afternoon, instead they juggled with some malicious virus inside their computer. properties of concrete is available in our digital library an online access to it is set as public so you can download it instantly. Our digital library hosts in multiple locations, allowing you to get the most less latency time to download any of our books like this one. Merely said, the properties of concrete is universally compatible with any devices to read.

1,701 citations

Journal ArticleDOI
TL;DR: In this article, 100% recycled hot mix asphalt lab samples were modified with five generic and one proprietary rejuvenators at 12% dose and tested for binder and mixture properties, which ensured excellent rutting resistance while providing longer fatigue life compared to virgin mixtures and most lowered critical cracking temperature.

307 citations

Journal ArticleDOI
TL;DR: In this paper, the state-of-the-art approaches for increasing the amount of reclaimed asphalt pavement (RAP) in asphalt mixtures above 40% are summarized and methods to optimise the mix design as well as production technology in order to allow manufacturing of such sustainable mixtures are described.
Abstract: Asphalt is the most recycled material in the USA at a re-use rate of 99%. However, by average only 10–20% reclaimed asphalt pavement (RAP) is used in a given mix design and large part of the RAP is degraded for use in lower value applications. The amount of RAP in asphalt mixtures can be significantly increased with the application of good RAP management practice, readily available modern production technologies and advanced knowledge of mix design. This paper summarises the state-of-the-art approaches for increasing the amount of RAP in asphalt mixtures above 40%. The production challenges and common pavement distresses of very high RAP content mixtures are identified and methods to optimise the mix design as well as production technology in order to allow manufacturing of such sustainable mixtures are described. The best practices for RAP management and economic benefits of high RAP use are also discussed.

249 citations

Journal ArticleDOI
TL;DR: A holistic evaluation of the feasibility of producing 100% recycled asphalt pavement mixtures is presented in this article, where a cradle-to-gate analysis of environmental effects indicated 18 kg or 35% CO2eq savings per t of produced 100% RAP asphalt mixture compared to virgin mix, while cost analysis showed at least 50% savings in material related expenses.
Abstract: a b s t r a c t A holistic evaluation of the feasibility of producing 100% recycled mixtures is presented. Eleven tech- nologies readily available for producing 100% Reclaimed Asphalt Pavement (RAP) hot asphalt mixtures are described in the article and the complementary video (http://youtu.be/coj-e5mhHEQ). The recorded performance of 100% RAP mixtures is analyzed along with identification of typical high RAP distresses. Recommended mix design procedures and the best RAP management strategies are described. A cradle- to-gate analysis of environmental effects indicated 18 kg or 35% CO2eq savings per t of produced 100% RAP asphalt mixture compared to virgin mix, while cost analysis showed at least 50% savings in material related expenses.

241 citations

01 Jan 2014
TL;DR: A holistic evaluation of the feasibility of producing 100% recycled asphalt pavement (RAP) mixtures is presented in this paper, where a cradle-to-gate analysis of environmental effects indicated 18 kg or 35% CO2eq savings per t of produced 100% RAP asphalt mixture compared to virgin mix, while cost analysis showed at least 50% savings in material related expenses.
Abstract: a b s t r a c t A holistic evaluation of the feasibility of producing 100% recycled mixtures is presented Eleven tech- nologies readily available for producing 100% Reclaimed Asphalt Pavement (RAP) hot asphalt mixtures are described in the article and the complementary video (http://youtube/coj-e5mhHEQ) The recorded performance of 100% RAP mixtures is analyzed along with identification of typical high RAP distresses Recommended mix design procedures and the best RAP management strategies are described A cradle- to-gate analysis of environmental effects indicated 18 kg or 35% CO2eq savings per t of produced 100% RAP asphalt mixture compared to virgin mix, while cost analysis showed at least 50% savings in material related expenses

216 citations