Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Asphalt Binder

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.

Evaluating The Effects of Micro and Nano Size of Silica Filler on Asphalt Cement Properties

Hussein H. Zghair; Hasan H. Joni; maan s. hassan

Engineering and Technology Journal, 2020, Volume 38, Issue 12, Pages 1832-1841
DOI: 10.30684/etj.v38i12A.1565

This research study examines the practicability of using micro and nano size silica to improve the asphalt characteristics. Asphalt cement penetration grade of (60 /70) was prepared using (0%, 2%, 4% and 6%) of silica filler by weight of asphalt and investigated in terms of the softening point, penetration, and penetration index, viscosity, and ductility values. To modify the asphalt binder, the silica powder was mixed by a mechanical blender set at (2000) rpm at a mixing temperature of 140°C. However, the main challenge is an agglomeration of nano-silica powder which can reduce the ductility of nano silica modified binder. Therefore, this paper studies the efficiency of mixing period to obtain a homogeneous composite binder while alleviating the agglomeration issue. To do so, the effect of periods of mixing ranged between (30 to 60) minutes were examined on characteristics of modified asphalt binders. Overall, the addition of silica filler has an encouraging impact on the asphalt binder rheological properties. Also, the ductility value decreases with the addition of nano-silica content, attributed to the huge surface area and degree of agglomeration. Furthermore, results exhibited that 6% of micro silica powder and 4 % of nano silica powder were reasonable to develop the rheological properties.

Determining the Low Temperature Cracking of Local Asphalt Binder Using Asphalt Binder Cracking Device (Abcd)

Alaa Hussein Abed

Engineering and Technology Journal, 2013, Volume 31, Issue 21, Pages 444-452

Since asphalt binder is the most important factor that affects low-temperature cracking. It is imperative to know the critical cracking temperature in order to identify susceptible asphalts. The low temperature thermal cracking of asphalt pavements is one of the main causes for annually repeating expensive highway repairs. To determine the low-temperature cracking potential of the asphalt binder, asphalt binder cracking device (ABCD) was used. The operating principle of ABCD is based on the differential thermal contraction between the metal ABCD ring and an asphalt binder placed outside the ring, as the temperature is lowered, the test binder shrinks more rapidly than the ABCD ring placed inside, which lead to develop thermal stresses, when the thermal stress exceeds the strength of the binder, the binder specimen cracks. Strain gauges installed inside the ABCD ring detect the fracture, and the temperature is recorded as the ABCD cracking temperature. Four groups of local asphalt binders were used for this study; Daurah PG 64-16 (Pen 40-50) both rolling thin film oven (RTFO) and pressure aging vessel (PAV) aged , Daurah PG 58-22 (pen 85-100) RTFO and PAV aged, Baiji PG 64-16 (pen 40-50) RTFO and PAV aged, Basrah PG 64-16 (pen 40-50) RTFO and PAV aged. There is a fairly good agreement between ABCD results and Bending Beam Rheometer (BBR) in cracking temperature, for asphalt binder PG 64-16 the differences in cracking temperature about 6 o C, while for asphalt binder PG 58-22 there no significant differences. All the tests of local asphalt binders are done in the University of Wisconsin-Madison- USA.