The interaction mechanism of activated crumb rubber modified asphalt during the preparation process

Résumé fourni par la source

Rubber activation is an effective method for achieving high crumb rubber (CR) content applications, which has the advantages of energy saving, environmental protection, and reduce carbon footprint. However, the interaction mechanism between high-content activated crumb rubber (ACR) and asphalt is unclear, which limits the improvement of ACR-modified asphalt (ACRMA) performance. This study conducted phase separation tests on 30% ACRMA during the mixing, shearing, and curing stages and the the performance of the rubber and asphalt phases were evaluated. The results showed that after electromagnetic thermal activation, ACR achieved desulfurisation. As the reaction proceeds, the fluffiness of the rubber phase of ACR increases, and the surface chemical structure and micro-structure became more stable. CR underwent desulfurisation during the preparation stage, and the reaction process with asphalt was uncontrollable. Meanwhile, the dispersion uniformity of ACR in the asphalt phase was enhanced, and the effective contact area between ACR and asphalt was increased. The improvement contributed to the swelling of ACR in asphalt and targeted improvement of ACRMA performance. However, the overall distribution of CR in the asphalt phase was not uniform, with many unswollen CR. The clarification of the reaction mechanism of high-content ACRMA provided a theoretical basis for its application.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.