Effect of laboratory aging on moisture susceptibility of polymer-modified bituminous mixtures

Abstract

The increase in heavy traffic load due to increasing number of vehicles and trucks with the effects of other exterior factors such air temperatures and moisture have caused distresses on pavement. In this study, the influence of laboratory aging on the mechanical properties of Polyethylene-modified concrete mixtures was studied utilizing different experiments. Polyethylene Terephthalate (PET) waste plastic bottles was used at different percentage i.e. 1%, 2%, 3%, and 5% by weight of bitumen. The design bitumen content was obtained for dense mixture according to superpave system. Marshall Stability, Flow, indirect tensile strength, and tensile strength ratio at two aging levels are conducted to evaluate the performance change of asphalt mixtures. Mixtures were conditioned at shortterm aging temperature of 135°C for different time periods (2, 6 and 8 hrs). Long-term aging was completed after compaction of test specimens to the desired air void level of 4 ± 0.5% using Superpave gyratory compactor at three different temperatures (75, 85 and 95) °C and four aging periods (0, 2, 5, and 10 days. The results showed that adding PET polymer to paving blend has good significance; it improved stability, flow, HMA density in addition to moisture resistance because of great elastic ability provided by PET particles, it can be found that 4 and 5% of PET content gave the best results as compared with the control mixture.

Effect of Styrene Butadiene Styrene on Properties of Open-Graded Asphalt Concrete Mixtures

“…The selected gradation follows (ASTM D-7064) [22] for open-graded asphalt pavement mixtures. In this study, one trial blend was used of aggregate gradation having (19 mm) maximum aggregate sizes (MAS), the gradation is shown in Table (7) and Figure (1).…”

“…The Asphalt Institute [24] recommends that the laboratory mixing and compaction temperatures for asphalt binder should be determined where the viscosity-temperature line crosses the viscosity ranges of 0.17 Five different percentages of asphalt contents (4, 4.5, 5, 5.5 and 6 %) are used to find the optimum asphalt content using Marshall mix design method according to ASTM (D7064-13). Figures (3) to (7) show Marshall mix design curves for optimum asphalt content and it is found (5.2 %), it is determined by averaging the values shown below:…”

“…The Open-graded friction course (OGFC) is defined as thin wearing surface of permeable hot mix asphalt (HMA) that is being applied for exceptional purpose of drainage around the world [5] [6]. Due to increasing traffic volume combined with the effects of other exterior factors such air temperatures and moisture causing pavement distress [7] and affecting the performance of the asphalt concrete [8], the use of permeable pavement OGFC has been spread due its safety characteristics. These characteristics affect positively towards the driver, and regularly utilized as final riding surface on the high-speed expressways [5] [9].…”

Bio‐Carbon as a Means of Carbon Management in Roads

“…[38] Wrapping aggregates with PET particles during the dry process in which PETs are mixed with hot aggregates improves the adhesion forces at the bitumen-aggregate interface. [39][40][41] Many studies have acknowledged that the optimum dosage of PET must be determined to have more efficacy at improving bitumen's properties. The addition of 12% PET by weight of bitumen increased the asphalt's service life by about three times and saved ≈20% of the asphalt layer's thickness.…”

Enhancement of Hot Mix Asphalt stability by utilizing Cement Kiln Dust and Styrene-Butadiene-Styrene Polymer

“…This is exacerbated by heavy traffic loads resulting from an increasing number of vehicles and trucks, Furthermore, weather and humidity might have a role in causing pavement discomfort. [2]. In order to reduce environmental pollution and conserve natural resources related to pavement construction [3].…”