Moisture damage of the asphalt concrete layer is identified as a significant contributing parameter leading to premature pavement failure. The existence of moisture with repetitive vehicular activity can harm the structural integrity and overall functionality of asphalt pavements. The quantity of water damage in the asphalt concrete layer is influenced by numerous variables, including but not limited to aggregate characteristics, asphalt cement, mix design and construction, traffic volume, environmental conditions, and features of any additives present. In recent times, the implementation of thin asphalt overlay (TAO) has emerged as a greatly recommended remedial approach for addressing the deterioration of pavements. The Asphalt Binder is a crucial component in the composition of asphalt paving mixes, playing a significant role in influencing the asphalt pavements’ performance. This investigation aims to analyze the impact of variations in modified binders on the strength characteristics of modified thin asphalt mixes containing waste materials. The assessment procedure including producing a mix of polymers modified asphalt (PMA) incorporating two different kinds of modifiers, specifically Low-Density Polyethylene (LDPE) and Crumb Rubber Modifier (CRM). The utilization of CRM and LDPE in the fines form with a particles size smaller than 250 um was employed as supplementary components to liquid neat asphalt. These additives were incorporated into the virgin asphalt in varying proportions, namely, PMA (Polymer-Modified Asphalt) consisting of 15.0% CRM by total weight of asphalt binder and LDPE in quantities of 2.5%, 5.0%, 7.5%, and 10.0% by total weight of asphalt binder. Three distinct aggregate gradations, specifically 12.5, 9.5, and 4.75mm, were employed, corresponding to the Nominal Max Aggregate Size (NMAS). Additionally, the Indirect Tensile Strength (ITS) test was employed to ascertain the strength of produced mixes in relation to moisture damage. Approximately 90 cylindrical samples, were employed to evaluate the impact of moisture-induced deterioration. The experimental findings have conclusively shown that incorporating modified waste-polymers into asphalt cement, employing varying percentages, has yielded substantial enhancements in durability characteristics.

Topics
Materials properties, Cement, Polymers
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