Recycled stone mastic asphalt mixtures incorporating high rates of waste materials

Abstract

The new environmental targets set to save natural resources and recover waste materials have been the basis for several scientific studies in different research areas. Consequently, this work aims at developing recycled stone mastic asphalt mixtures with high rates of waste materials, including reclaimed asphalt pavements, waste engine oil products, waste polyethylene and crumb rubber. This new solution was compared with a conventional stone mastic asphalt mixture. Several blends of high penetration bitumens modified with waste materials and reclaimed aged bitumen were evaluated through basic and advanced tests, and the most promising solutions were selected to produce recycled stone mastic asphalt mixtures for further characterization. The water sensitivity, permanent deformation and fatigue cracking performance of those mixtures incorporating high rates of different waste materials were generally improved. The exceptional behaviour of these recycled mixtures together with the high incorporation rate of waste materials demonstrate the innovative character of these solutions for the road paving industry.

Using waste polymers as a reliable alternative for asphalt binder modification – Performance and morphological assessment

“…The melting point (Tm) temperature of plastic wastes is critical due to the influence on their compatibility with the asphalt binder and on the modification success [7,8]. These results were obtained in the DSC tests, whose thermograms are shown in Fig.…”

“…The recycling of plastic wastes for bitumen modification in paving works has been reported in the literature, highlighting the studies carried out with high-density polyethylene (HDPE) [6][7][8] and ethylene vinyl acetate (EVA) [1,9,10], which are the waste polymers used in the present work due to their better compatibility with bitumen [11]. Examples of the use of other waste polymers can also be found on previous works, namely low-density polyethylene -LDPE [12], polypropylene -PP [12,13], acrylonitrile butadiene styrene -ABS [14], polyvinyl chloride -PVC [13,15,16], polyethylene terephthalate -PET [17][18][19].…”

Evaluation of the Long-Term Performances of SMA-13 Containing Different Fibers

“…Stone mastic asphalt (SMA) [1,2] has been widely used in the construction of highways because of its excellent engineering performances. SMA has a high coarse aggregate content that interlocks to form a stone skeleton that resists permanent deformation.…”

“…The stone skeleton is filled with a mastic of bitumen and filler. It has more stone-on-stone contact and asphalt content than conventional dense graded asphalt mixtures [1,2]. However, with the continuous growth of the logistics industry and traffic load, many asphalt mixtures suffer early damage within 1 to 2 years of service, and in this respect, the durability of the mixtures is gaining increasing attention from the people [3,4].…”

Stabilizing Highly Dispersed Porous Mineral-Based Additives for Macadam Mastic Asphalt Concrete

“…Russian and foreign scientists are studying additives that reduce runoff (B) and improve the quality of macadam-mastic asphalt concrete mixes. Currently, to reduce the cost of macadam-mastic asphalt mixes, various industrial waste is added into their compositions [1][2][3][4]. [5,6] suggest using industrial fiber waste or cardboard as stabilizing additives for MMAC.…”