Abstract
Rutting is mainly referring to pavement permanent deformation, it is a major problem for flexible pavement and it is a complicated process and highly observed along with many segments of asphalt pavement in Iraq. The occurrence of this defect is related to several variables such as elevated temperatures and high wheel loads. Studying effective methods to reduce rutting distress is of great significance for providing a safe and along-life road. The asphalt mixture used to be modified by adding different types of additives. The addition of additives typically excesses stiffness, improves temperature susceptibility, and reduces moisture sensitivity. For this work, steel fibres have been used for modifying asphalt mixture as they incorporated in the specimens by three percentages designated as 0.5, 1.0 and 1.5 % by the weight of asphalt mixture. The evaluation process based on conducting Marshall Test, Compressive strength test, and the wheel tracking test. The optimum asphalt content was determined for asphalt mixture. The results of the Marshall quotient and the index of retained strength of modified mixtures were increased by 44.0 and 17.38% respectively with adding 1.0% of steel fibres compared with the conventional mixture. The rut depth and dynamic stability were determined by using a wheel tracking test at two various testing temperatures of 45 and 55°C and two applied stresses of 70 and 80 psi. Results show that adding 1% of steel fibres to asphalt mixtures is very effective in increase the rutting resistance and reduce moisture damage.
Highlights
Rutting was a major problem for flexible paving
Aniruddh and Berwal (2016) studied the efficiency of asphalt concrete Mixtures modified with steel fibers in different quantities (2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5 and 6%) with a length of 18 mm and 11 mm were tested during the conduct of the Marshall stability test for control and modified mixtures, The results presented that a higher improvement in the stability of asphalt mixture was at the optimum percent of added steel fibers for asphalt mixture at 3.5% of 11 mm length steel fiber. so, this fibers content was suggested for the improvement of the bituminous mix parameters [13]
This is probably due to the well-distributed steel fibers in different directions of the bituminous matrix, which are highly resistant to shear displacement and strongly prevent any movement of aggregate particles, the rutting resistance of the mixture increasing
Summary
Rutting was a major problem for flexible paving. It is a longitudinal depression in the wheel paths of the roadways, Rutting is the most common is pavement permanent deformations due to repetitive loads of traffic that accumulation of small permanent strains of pavement materials after passing each axle load after a certain time. Many factors should be considered to quality control procedures such as long economic life, environmental sustainability, low construction and repair time, low maintenance costs, use of waste materials [1, 2]. The increase of stiffness leads to improve the rutting resistance of the asphalt pavement in the high-temperature weather and allows the use of comparatively flexible asphalt [3]. Despite many uses of fibers, which use in asphalt pavement construction as an asphalt mixture additive is a new field of study [4]
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