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10 results on '"Obaidi, Hadel"'

1. Development of innovative pothole repair materials using induction heating technology

Author

Obaidi, Hadel Ibraheem Ahmad

Subjects
625.8, TE Highway engineering. Roads and pavements
Abstract

Millions are spent by authorities to maintain and repair the world's potholes. In addition to the direct costs, they can also lead to damaged vehicles and an accelerated deterioration of the road system. The potholes create traffic risks that lead to the daily loss of hundreds of work hours for drivers and passengers. Many road crews are not familiar with the proper materials and methods for pothole repair. Correct selection of pothole patching materials and proper application of repair procedures can greatly increase the longevity of pothole repairs, lead to fewer driver frustrations, and lower road maintenance budgets. The present study aims to develop innovative materials to repair of potholes by using induction heating technology. Three innovative patching materials to repair potholes are proposed, assessed and compared with conventional pothole patching materials. The first material is a combination of a prefabricated asphalt tile and a bonding layer that can be placed into a sanitised pothole and bonded by applying electromagnetic induction heating. The second material involves using prefabricated asphalt pellets to directly fill a pothole and then heated by induction. The third material comprises (1) prefabrication of binder pellets containing bitumen and steel wool that has been coated with a shell to avoid them sticking to each other; (2) the development of a mobile induction heating mixer that can mix the binder pellets with cold aggregate on-site before directly filling a pothole and compacting the mixture. In this research, their tensile and shear strength properties were assessed and demonstrated by repairing simulated potholes on testing slabs and subjected them to wheel tracking tests. The innovative patching materials showed excellent durability higher than a road repaired with cold mix asphalt. Furthermore, the innovative patching materials have been evaluated from economic and environmental standpoints and compared results with conventional hot mix and cold mix. These proposed patching materials have been applied by different raw materials and procedures, and have importance of properties that performed by laboratory tests. Based on the results of loaded wheel test, the service life of each patching materials has been calculated. An inventory was prepared to help quantify the energy requirements, material inputs, and emissions produced during production of raw materials, prefabrication of each product and their final installation. The requisite data was obtained from various sources in the literature. Two maintenance hypothesis were considered. The results showed that three innovative patching materials may be more sustainable and could reduce cost, energy usage and CO2 emissions over time in agreement with hypothesis 1. However, they may cause to increase the economic and environmental impacts over time in agreement with hypothesis 2.

Published
2018

2. Study of some properties of sustainable lightweight concrete-based on epoxy, scoria and charcoal.

Author

Mahdi, Zainab H., Obaidi, Hadel, and Rahman, Eman Abdul

Subjects
*LIGHTWEIGHT concrete, *CONSTRUCTION materials, *ENERGY consumption, *COMPRESSIVE strength, *EPOXY resins, *CHARCOAL
Abstract

The development of infrastructure and the increased demand for concrete has resulted in high demand for cement and the depletion of virgin aggregates which harm the environment. Construction materials must prioritize economics, efficient energy use, and environmental preservation to promote sustainable development. Utilizing locally accessible building materials is one of the techniques used in the creation of lightweight concrete since it offers several advantages over normal-weight concrete. This paper aims to study the effect of the suitability of scoria and charcoal as fine and coarse aggregate and to replace the cement with epoxy to produce lightweight concrete. Four series have been used to produce lightweight concrete with mixed proportions of (1:2:4) (epoxy: scoria or charcoal fine: scoria or charcoal coarse) and (1:6) (epoxy: scoria or charcoal coarse) by volume. Compressive strength, bulk density, and water absorption tests have been applied to samples that were cured at 7, 14, and 28 days. The results showed that the compressive strength, bulk density, and water absorption of series 1 (epoxy: scoria fine: scoria coarse) and series 2 (epoxy: scoria coarse) were better than the series 3 (epoxy: charcoal fine: charcoal coarse) and series 4 (epoxy: charcoal coarse). [ABSTRACT FROM AUTHOR]

Published
2024
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3. Producing sustainable concrete using two types of plastic waste as a partial replacement of fine aggregate.

Author

Obaidi, Hadel

Subjects
*HIGH density polyethylene, *LOW density polyethylene, *PLASTIC scrap, *CONCRETE mixing, *POLYETHYLENE
Abstract

The use of plastic has been increasing in various aspects of modern life, leading to a huge amount of plastic waste, which affects negatively the environment and humanity. In this paper, the effect of high density polyethylene (HDPE) and low density polyethylene (LDPE) wastes as a partial replacement of natural sand is studied and examined some mechanical properties of concrete. All specimens (60 specimens) were tested after 7 and 28 days. Concrete mixes containing minced polyethylene were prepared by using the replacement ratios partially (5, 10, 15, and 20) by volume of sand. The test results showed that the density of HDPE and LDPE decreased with the increased amount of polyethylene ratios. The values of compressive and splitting tensile strengths for the specimens containing HDPE were higher than the strengths of specimens containing LPED. The results also showed the specimens with 5% and 20% replacement ratios an increase in the strengths, while the specimens with 10% and 15% replacement ratios showed varying behavior of the strengths. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Mitigating Reflection Cracking in Asphalt Concrete Overlays with ECC and Geotextile.

Author

Albayati, Amjad H., Oukaili, Nazar K., Obaidi, Hadel, and Alatta, Bahaa M.

Subjects
ASPHALT concrete, CRACKING of concrete, ASPHALT concrete pavements, CEMENT composites, CONCRETE pavements, ASPHALT
Abstract

The rehabilitation of deteriorated pavements using Asphalt Concrete (AC) overlays consistently confronts the reflection cracking challenge, where inherent cracks and joints from an existing pavement layer are mirrored in the new overlay. To address this issue, the current study evaluates the effectiveness of Engineered Cementitious Composite (ECC) and geotextile fabric as mitigation strategies. ECC, characterized by its tensile ductility, fracture resistance, and high deformation capacity, was examined in interlayer thicknesses of 7, 12, and 17 mm. Additionally, the impact of geotextile fabric positioning at the base and at 1/3 depth of the AC specimen was explored. Utilizing the Overlay Testing Machine (OTM) for evaluations, the research demonstrated that ECC17 significantly mitigated reflection cracking, showing a notable 764% increase in the number of load cycles to failure (Nf) compared to the Geotextile Base (GB) specimen. Against the Reference Specimen (RS), ECC17 exhibited a remarkable 1307% enhancement in Nf values, underscoring its effectiveness. Geotextile fabric, particularly at 1/3 depth, demonstrated notable resistance but was overshadowed by the performance of ECC interlayers. The results clearly indicate that ECC, especially ECC17, stands out as an effective solution for mitigating reflection cracking, including joints, in AC overlays. [ABSTRACT FROM AUTHOR]

Published
2024
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6. ASSESSMENT OF SOME MECHANICAL PROPERTIES FOR CONCRETE BASED ON ALUM SLUDGE AND METAKAOLIN.

Author

OBAIDI, HADEL, FARHAN, AHLAM ABDUL-RHEEM, and AL-SAADI, TAHA H. ABOOD

Subjects
CONCRETE, ALUM, CARBON emissions, CONCRETE industry, URBAN research
Abstract

Since concrete is a consistently reliable building material, its importance to all nations' economies cannot be overstated. However, the cement and concrete industries continue to generate massive amounts of waste which results in the emission of carbon dioxide which is one of the environmental issues. Therefore, reducing the amount of cement is important by partially replacing one of the waste materials. In this research; two municipal materials were used as alternatives for cement. It is considered available in quantities with appropriate price as compared to other mineral materials. In addition, this research was interest given to assess the strengths and durable behaviour of concrete production with these addition materials. The amount of metakaolin used is (1-15) wt% and alum (1-5) wt% of cement. The central composite design (CCD) method was used in conjunction with the response surface method to design concrete mixtures for this research and to analyse the results obtained from laboratory tests. An empirical model was given for compressive strength, bulk density and splitting tensile strength. All concrete specimens were cured after 7 and 28 days. The best results were found when metakaolin was used between (1-3) wt% and alum sludge between (1.6-3) wt% as mixed materials to produce concrete and as a partial replacement of cement. [ABSTRACT FROM AUTHOR]

Published
2023

10. Development of innovative pothole repair materials using induction heating technology

Author

Obaidi, Hadel Ibraheem Ahmad and Obaidi, Hadel Ibraheem Ahmad

Abstract

Millions are spent by authorities to maintain and repair the world’s potholes. In addition to the direct costs, they can also lead to damaged vehicles and an accelerated deterioration of the road system. The potholes create traffic risks that lead to the daily loss of hundreds of work hours for drivers and passengers. Many road crews are not familiar with the proper materials and methods for pothole repair. Correct selection of pothole patching materials and proper application of repair procedures can greatly increase the longevity of pothole repairs, lead to fewer driver frustrations, and lower road maintenance budgets. The present study aims to develop innovative materials to repair of potholes by using induction heating technology. Three innovative patching materials to repair potholes are proposed, assessed and compared with conventional pothole patching materials. The first material is a combination of a prefabricated asphalt tile and a bonding layer that can be placed into a sanitised pothole and bonded by applying electromagnetic induction heating. The second material involves using prefabricated asphalt pellets to directly fill a pothole and then heated by induction. The third material comprises (1) prefabrication of binder pellets containing bitumen and steel wool that has been coated with a shell to avoid them sticking to each other; (2) the development of a mobile induction heating mixer that can mix the binder pellets with cold aggregate on-site before directly filling a pothole and compacting the mixture. In this research, their tensile and shear strength properties were assessed and demonstrated by repairing simulated potholes on testing slabs and subjected them to wheel tracking tests. The innovative patching materials showed excellent durability higher than a road repaired with cold mix asphalt. Furthermore, the innovative patching materials have been evaluated from economic and environmental standpoints and compared results with conventional hot mix

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