Abstract
Development of hazardous gases emissions through the production and construction of Hot Mix Asphalt (HMA) have encouraged the transition to Warm Mix Asphalt (WMA) which is considered as one of the best choices of sustainable materials in asphalt pavement. The temperature reduction in the mixing, handling, and compaction of the mix gets in saving energy, cutting emissions and significant cuts in construction costs. In this investigation, two WMA mixtures have been prepared in the laboratory using medium curing cutback (MC-30) and cationic emulsion asphalt. HMA mixture was also prepared for comparison. Marshall size Specimens of (101.6 mm) in diameter and (63.5 mm) in height were constructed from these mixtures and subjected to repeated Indirect Tensile Strength test (ITS) to determine the effect of asphalt type and content on deformation and resilient behavior of asphalt mixture. Another group of cylindrical specimens of (101.6 mm) diameter and (101.6 mm) in height have been constructed from these mixtures and subjected to repeated compressive stresses test to determine the rutting resistance of asphalt mixture. Test results were analyzed and compared. It was concluded that, the permanent deformations for cutback and emulsion treated WMA was higher than that of HMA by (50 and 35) % respectively. The Resilient Modulus (Mr) at 25 ⁰C under repeated (ITS) for cutback and emulsion treated WMA was lower than that of HMA by (39.95 and 27.94) % respectively. On the other hand, the (Mr) for cutback and emulsion treated WMA was higher than that of HMA by (43.75 and 5.47) % respectively under repeated compression load at stress level 0.138 (MPa).
Highlights
The general expression of Warm Mix Asphalt (WMA) refers to the variety of mixtures which are produced at temperatures (20-30 °C) less than the typical production temperature for Hot Mix Asphalt (HMA)
The third stage includes the measurement of permanent deformation and resilient modulus of the mixtures under repeated indirect tensile stresses, while the fourth stage was concerned with rutting resistance and resilient modulus determination under repeated compressive stresses
The mineral filler utilized in this investigation is Portland cement, it was produced by Al-Mas Company and obtained from the market
Summary
The general expression of WMA refers to the variety of mixtures which are produced at temperatures (20-30 °C) less than the typical production temperature for HMA. López et al (2017) studied determine the laboratory performance of field-produced mixtures which used the WMA to evaluate the effect of lowering production temperature on the mixture characteristics in the field and find there was no difference in the rutting performance of WMA compared with HMA [9]. A sharp reduction in the stiffness rate could be noticed for WMA mix with cutback as compared to the gentle reduction in the case of WMA mix of emulsion and HMA [20] The goal of this investigation is to evaluate the influence of implementing medium curing cutback (MC-30) and cationic emulsion as a binder on the deformation and resilient behavior of WMA under repeated (ITS) and rutting resistance of the WMA
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