Research on recycled concrete aggregates (RCAs) has been progressively advanced. Beyond replacing natural aggregates with RCA, discussions have been held on the effect of the parent concrete and repeatedly recycled aggregate concrete. Although it has been reported that RCA can be technically used for structural concrete, due to several other factors, RCA is mainly used for sub-bases. Therefore, identifying these factors is the key to promoting the use of RCA. Therefore, this review study first briefly summarizes the physical and chemical characteristics of RCA compared to natural aggregate, and reviews the effects of parent concrete and repeatedly recycled aggregate on next generation concrete. This study also briefly discusses the RCA standards of various countries and the factors that hinder the widespread use of RCA. The results show that there is a correlation in properties between parent concrete and the next generation concrete, and the properties of concrete decrease when RCA is used repeatedly. In addition, on the basis of the literature review, factors hindering the use of RCA were found to be unstable supply and demand, economic feasibility, and negative perceptions.

En este artículo se presenta la primera parte de un trabajo que propone la construcción de criterios metodológicos para integración urbana de barrios populares, a partir de la selección de casos representativos localizados sobre áreas de vulnerabilidad ambiental. El sector de estudio corresponde con la Microrregión del Gran La Plata, donde es posible identificar áreas con características ambientales que elevan el grado de vulnerabilidad para sus habitantes. La metodología consiste en la identificación de áreas prioritarias en relación con los ejes social y ambiental y el establecimiento de criterios para selección de los casos factibles de intervención y /o recuperación en base a sus condiciones particulares. Los resultados arrojan cuatro casos representativos de las problemáticas más relevantes en el área de estudio y sientan las bases para la segunda parte de la investigación.