Abstract
The primary objective of this study is exploring the moisture susceptibility of unmodified and SBS-modified hot and warm mix asphalt mixtures. To this end, two different WMA additives including Aspha-min and Sasobit were employed to fabricate WMA specimens. The moisture susceptibility of warm polymer modified asphalt (WPMA) mixes was evaluated using modified Lottman test at 25°C according to AASHTO standard (T 283). In addition, the effect of different percentages of hydrated lime (from 0% to 2%) and Zycosoil (from 0% to 0.1%) as anti-stripping additives on the moisture susceptibility of the mixtures was explored. Based on the ITS test results, WPMA prepared with Sasobit additive and polymer modified asphalt (PMA) mixes satisfied the desirable tensile strength ratio (TSR) (above 80%) but Aspha-min WPMA mixes had TSR lower than 80%.
Highlights
Asphalt concretes are widely used materials that produced for paving of road surfaces
This study reported a comparison between moisture susceptibility of Warm Mix Asphalt (WMA) and warm polymer modified asphalt (WPMA) mixtures
A part of the research work focused on examining the effects of anti-stripping agents including lime and a nanomaterial, Zycosoil, on moisture sensitivity of control Hot Mix Asphalt (HMA) samples and WMAs prepared with Sasobit and Aspha-min additives
Summary
Asphalt concretes are widely used materials that produced for paving of road surfaces. WMA is a new product of asphalt materials industry. It collects privileges such as reduced compaction and paving temperatures, increasing workability, lower compaction effort due to reduced viscosity, less fumes and green gas emission, reduced costs for maintenance of asphalt plants, reduced aging and more resistance against cracking, and acceptable performance of the mixtures. Some issues impede the widespread usage of WMAs including conditioning and fabrication of samples in laboratory, inadequate coating of aggregates with bitumen, and vulnerability to rutting. Increased moisture damage in WMA mixtures because of improper drying of aggregates at low temperature is a more apparent mistake [3]
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