Most of road networks are constructed using hot mix asphalt (HMA). HMA is used for roads construction and maintenance at high temperature (150-170˚C) requiring high fuel consumption. In addition, gases emissions generated from HMA are issues of concern among the pavement researchers. Therefore, reducing gases emission and mixing temperature is an objective toward sustainable asphalt pavement industry. Thus, using warm or half-warm asphalt mixes as a modern technique are considered suitable alternatives to HMA. This study aims to reduce gasses emissions and manufacturing cost of HMA using half-warm mixes asphalt (HWMA). Chemical additives are used in order to produce HWMA at low temperature. In this study, Ethoxylated Nonyl Phenol (NP9) was used to enhance the performance of asphalt mixes at low temperature. The tried percentages of NP9 were 10, 15, 20, and 25% (by weight of bitumen). The tested mixes include control mix (mixed at 155°C) and modified mixes (mixed at 90°C, HWMA modified by NP9). Rolling thin film oven (RTFO), Marshall, moisture susceptibility, indirect tensile strength (ITS), wheel tracking, scanning electron microscopic (SEM) and gases measurements tests were carried out for control and modified mixes. The results indicated that, significant changes were occurred in modified mixes compared to the control mixes. Bitumen viscosity decreased by the increase of NP9 percentages. The optimum percentage of NP9 was 10% by weight of bitumen.The retained penetration of modified specimens by 10% NP9 was higher than conventional specimens by 40.26%. Also, the results showed that Marshall stability and Marshall Quotient (MQ) of HWMA enhanced by 15.22% and 11.58% respectively. Producing HWMA reduced the loss of stability by 18.10% and changed tensile strength ratio from 91% to 96% by an enhancement of 5.50% compared to the conventional mixes. In addition, the resistance of HWMA specimen against rutting was higher than or as same as the value of control specimen during the test period. From SEM test results, a significant change was observed for all tested specimens , the structure of control specimen under SEM was differ than the shape of modified specimens. Finally, the chemical analysis showed that the gases emissions reduced by manufacturing HWMA at 90C.
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