Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Marshall stability

Enhancement of the Rutting Resistance of Asphalt Mixtures at Different High Temperatures Using Waste Polyethylene Polymer

Hasan H. Joni; Ali H. AL-Rubaie

Engineering and Technology Journal, 2022, Volume 40, Issue 11, Pages 1432-1440
DOI: 10.30684/etj.2021.131179.1008

The temperature and stress caused by the load can be cited as two main parameters leading to breakage in asphalt pavement, especially rutting (permanent deformation). So, to reduce the problems of rutting of roads, several actions have been taken, including improving pavement quality and the structure design methods. The increase in the attention of respective engineers in the last few years to modify and improve the asphalt performance through providing different types of additives and replacing the raw materials of asphalt mixture with recycled materials to improve the environment and reduce the cost of modified pavement mixture. This study discussed the use of low-density waste polyethylene as an asphalt modifier in percentages of (2, 4, and 6) % by the weight of asphalt and their impact on the performance of asphalt mixtures at high temperatures. This study showed that using plastic waste (low-density polyethylene) as a bitumen modifier improved the performance of asphalt mixtures at different high temperatures. This was achieved by reducing the rut depth by (80.5) % and (82.3) % at temperatures of 50 C and 60 C, respectively, using low-density polyethylene waste at an optimum value of about 4% by weight of asphalt in addition to enhancing the Marshall stability by using this percentage of polymer.

Modifying the Properties of Open-Graded Friction Course by Adding Cellulose Fiber

Ahmed J. Muhammed; Zaynab I. Qasim; Rasha H. Al-Rubaee

Engineering and Technology Journal, 2022, Volume 40, Issue 11, Pages 1365-1375
DOI: 10.30684/etj.2022.133420.1181

In recent years, Open Graded Friction Course OGFC is becoming more common in some countries. It is applied to improve surface frictional resistance, minimize hydroplaning, reduce water spray, improve night visibility, and lower pavement noise levels. These functions are carried out primarily by removing water from the pavement surface during a period of rain. Also, it has many disadvantages which as poor resistance to permanent deformation, low fatigue strength, high stripping, and moisture susceptibility. The paper aims to investigate the probability of using Cellulose Fiber (CF) as a modifier to improve the properties of OGFC asphalt mixture. In this research, one type of asphalt grade (40-50) and one gradation (19 mm Maximum Aggregate Size MAS) were used. Three percentages of CF (2%, 4%, and 6%) were added to asphalt cement to obtain the modified mixtures. Optimum asphalt content was selected by evaluating the following criteria: air voids content, asphalt drain down, abrasion resistance, and permeability. Several laboratory tests such as Indirect Tensile Strength (ITS), moisture susceptibility, Marshall stability, and flow were evaluated for modified samples, and their results were compared to the original open-graded asphalt mixture. The outcomes indicated that cellulose fiber greatly enhanced the mechanical properties of OGFC mixtures, increasing moisture damage resistance by 19.4%. Furthermore, Marshall stability improved by 38.92 % as the abrasion loss is decreased by 15.85% with adding of CF for aged samples.

Characteristics of Asphalt Binder and Mixture Modified With Waste Polypropylene

Mohammed Y. Fattah; Wissam, N. Abdulkhabeer; Miami M. Hilal

Engineering and Technology Journal, 2021, Volume 39, Issue 8, Pages 1224-1230
DOI: 10.30684/etj.v39i8.1716

Improving asphalt materials to develop the overall performance of asphalt binders and mixtures has been the focus of several investigations made over the past few decades. The application of discarded waste plastics in asphalt modification was one of the steps taken in this direction. Using waste materials in pavement construction would not only enhances asphalt properties but would also bring out significant saving in road material costs and help towards tackling disposal problems of such waste materials, which tend to be hazardous in as much as they can cause pollution of water, soil, and air. The purpose of this paper is to investigate the probability of using Waste Polypropylene (WPP) as modifier to enhance the properties of asphalt binder and mixture. In this paper, two types of asphalt binder (40/50) and (60/70) were used. Three percentages of WPP (1%, 3%, and 5%) were added to (60/70) asphalt binder/mixture to obtain the modified samples that were tested using several laboratory tests and their results were compared to original (60/70) asphalt binder/mixture and to those of (40/50) asphalt binder/mixture besides comparing with the Iraqi Specifications. The outcomes indicated that 3% of WPP was the optimum percentage that gave best results for asphalt binder and asphalt mixture compared to original and other percentages of asphalt samples and according to the Iraqi Specifications.

Marshall Characteristic for Reclaimed Asphalt Pavement

Noor Adel Ismaeel; Ayman A. Abdul Mawjoud

Engineering and Technology Journal, 2016, Volume 34, Issue 7, Pages 200-208
DOI: 10.30684/etj.34.7A.19

The recycling asphalt paving creates a cycle for the use of materials that improve the use of natural resources, as it reduces the use of new materials from the aggregate and asphalt, which can be a rare commodity in some areas. The increasing in the use of milling machines nowadays led to the production of large amount of wasted materials, recycling is consider an important solution that can take them into consideration when creating a network of new roads or rehabilitation of damaged networks. This process has many advantages. It is reduce the environmental pollution and preserves natural resources as well as economic benefit. The main objective of this study is to evaluate recycling material through Marshall test and knowing their validity and can be used in hot mix asphalt in the construction and maintenance of road networks in Iraq, with finding the best ratio of mixing with the new material. Where it was planned to use old materials from one of the streets of Mosul city, while the new material consisting of asphalt Grade (50-60) are included within the aggregate of binder course and cement as a filler. Optimum value of the asphalt content was found by Marshall method through the preparation of a mixture of new material and use this value in the preparation of mixtures of recycled where it was the use of five percentages of recycled materials, namely, (0%, 20%, 30%, 50% and 100%). These mixtures were exposed to : the Marshall test to find their characteristics. The results show that recycling rates up to 50% of recycled materials were perform well within specification limits for use, while 30% was considered as the ideal ratio showed better performance in all characterstics. Showed 30% increase in Marshall stability of the mix for the base mix to more than 41% and other characteristics are within the specification limits.

Modeling Stability and Flow of Asphalt Mixes Using Optimum Asphalt content

Hasan H. Al-Baidhani; Maan S. Hassan

Engineering and Technology Journal, 2013, Volume 31, Issue 21, Pages 465-577

The main aim of this study was to evaluate the asphalt mixture properties for samples that were taken from different sites and plants: Amanat Baghdad, Faluja municipality, and Baghdad Governorate, which almost produced in private plants. Forty seven asphalt mixtures samples were tested following Marshall Test. The tested properties were: Marshall Stability, Marshall Flow, specimen density, and air voids. Asphalt extraction was carried out according to quantative extraction of bitumen from paving mixtures test.
A statistical analysis of the collected field data was performed and a prediction model was built. The variables such as asphalt content, stability and flow data were analyzed using computer software. The statistical analysis includes four stages: data extraction and evaluation, verification, calibration, and validation.
Results of this study indicate that both of Marshall Stability and Marshall Flow correlate positively with asphalt content, but with different degree. Asphalt content affect Stability property much more than flow property of the asphalt mixes.