No abstract

Porous asphalt mixes (PAM), conform a special road surface for asphalt pavement structures. They have a distinctive particle size distribution that permits infiltration of the runoff storm water due to its voids content which is about 20 %. Many researchers have conducted studies and concluded that the use of modified asphalts is completely necessary to design PAM. Organic and chemical additives and special procedures such as foamed asphalt and including fibers into the mixture design have enhanced the performance of PAM, during its service life. This paper is based on the mechanical characterization of PAM and how the asphalt binder modified with fatty acid amides, influenced on their behavior and performance. In order to do so, an experimental methodology based on laboratory tests aimed to establish a comparison between porous asphalt mixes, designed and produced with a 60-70 in 1/10 mm penetration at 25 °C neat asphalt binder, and another using modified asphalt with fatty acid amides.Keywords: Modified asphalt, porous asphalt mixes, hot asphalt mixes, hydroplaning, fatty acid amides, Cantabro test. RESUMENLas mezclas asfálticas porosas (PAM), conforman una superficie de rodadura especial para los pavimentos flexibles. Tienen una granulometría característica, lo cual permite la infiltración de las aguas de escorrentía pluvial, gracias al contenido de vacíos que posee, alrededor del 20 %. Muchos investigadores han realizado estudios que han permitido concluir que el uso de asfaltos modificados es completamente necesario para diseñar las PAM. Aditivos químicos y orgánicos y procesos especiales tales como el de asfalto espumado y la inclusión de fibras en el diseño de la mezcla, han mejorado el comportamiento de las PAM, durante su periodo de servicio. El presente artículo aborda la temática de la caracterización mecánica de mezclas asfálticas porosas (PAM) y hace énfasis en cómo el cemento asfáltico modificado con amidas de ácidos grasos, influye en su comportamiento y desempeño. Esta investigación, basada en una metodología experimental a través de ensayos de laboratorio, estableció una comparación entre las mezclas asfálticas porosas, empleando para su diseño y producción una, con asfalto puro de penetración 60-70 en 1/10 mm a 25 °C y otra, cuyo asfalto está modificado con amidas de ácidos grasos.Palabras clave: Cemento asfáltico modificado, mezclas asfálticas porosas, mezclas asfálticas en caliente, hidroplaneo, amidas de ácidos grasos, ensayo Cántabro.

Social sustainability is a dimension of the concept of sustainability that has gained importance only in the last few decades and can be identified as the pursuit and measure of social equity. Equity can be analyzed under two approaches: horizontal and vertical. The horizontal approach considers the distribution of benefits equally, while the vertical equity considers these same benefits, but between specific groups, which is an adequate approach when dealing with policy-related topics, such as tariff subsidy. Accessibility is a factor that contributes to urban social sustainability and it may be a representation of physical and/or social barriers in the urban environment. Thus, this paper aims to assess social sustainability under a vertical equity approach, based on accessibility to jobs, for different population groups, comparing public with individual motorized transport. The case study was carried out in Medellín-Colombia, using data from the 2017 Home Destination Survey. It was found that users of individual transport have access to a greater number of jobs than users of public transport. In addition, those with higher income have better accessibility than those with lower income, even though they are not beneficiaries of tariff subsidy policies. Another highlight is that areas closer to the central region are also more accessible. In some specific communes, it would be indicated to seek to improve access through public transport, or the implementation of some public policy at the municipal level that could have an impact on access to opportunities.