Influence of Polymeric Coating the Aggregate Surface on Moisture Damage of Hot Mix Asphalt

Abstract

Moisture damage is one of the common causes of asphalt pavement failure in moisture presence. One of the convenient approaches to decreasing moisture sensitivity in hot-mix asphalt is coating the aggregate surface with a suitable agent. In this study, the effects of polyethylene terephthalate on moisture damage of asphalt mixtures were evaluated by applying indirect tensile strength and resilient modulus tests. The asphalt specimens were prepared with two types of aggregates (granite and limestone) and neat asphalt binder of 60/70 penetration grade. The results showed that the ratio of wet/dry values of indirect tensile strength and resilient modulus for mixtures containing limestone was higher than those of the samples with granite aggregate. Furthermore, the results of the laboratory tests indicate that polyethylene terephthalate improves resistance to moisture susceptibility. Because polyethylene terephthalate increases the wettability of asphalt binder over the aggregate and the adhesion between the asphalt binder and aggregate, especially in the mixtures containing acidic (granite) aggregate prone to moisture damage.

Moisture Sensitivity of Hot Mix Asphalt Modified with Micronized Calcium Carbonate

“…Water is commonly found in road pavement layers, especially in unbound granular layers such as subgrades and subbase layers. However, the presence of water within and between bound layers, specifically asphalt layers, is a relatively recent understanding within the professional community [1]. The bond quality between bitumen-aggregates has a considerable influence on the durability of HMA against moisture sensitivity [2].…”

Evaluation of the uses of treated sawdust as a partial replacement for aggregate in hot mix asphalt

“…In most cases of using vegetal materials in asphaltic concrete, the vegetal material should be treated with heating treatments (Sandra et al,2012;Martina et al,2010), chemical treatments (Abderrezak et al,2015), and coating treatments with a thin film of coal ash or polyethylene terephthalate (Saswat and Mahabir.,2016;Mojtaba et al,2021), with a lot of other ways of treatment. The experimental designs of full factorial DOE allow for better-organized tests that are involved in scientific studies or industrial studies (Bordjiba et al,2016).…”