Effective management and handling of construction and demolition waste (CDW) can yield significant technical and environmental benefits for road pavement construction. This article aims to provide a comprehensive and up-to-date chronological review of studies on the mechanical performance of asphalt mixtures—primarily hot mix asphalt (HMA)—incorporating recycled concrete aggregate (RCA). Since the main limitation of RCA is the presence of residual adhered mortar, the review also includes studies that applied various surface treatments (mechanical, chemical, and thermal, among others) to enhance mixture performance. The article summarizes the experimental procedures used and highlights the key findings and conclusions of the reviewed research. Although the results are varied and sometimes contradictory—mainly due to the source variability and heterogeneity of RCA—the use of these materials is technically viable. Moreover, their application can provide environmental, social, and economic advantages, particularly in the construction of low-traffic roadways. Finally, the article identifies research gaps and offers recommendations for future researches.

This article evaluates in the laboratory the physical and rheological properties of the modified asphalt cement (AC) with different contents of rubber (R) from used military boots. For the evaluation of the modified AC, laboratory tests of penetration, softening point, ductility, viscosity, short-term aging and determination of the rheological parameters in the DSR dynamic shearing rheometer were performed. In addition, the mechanical performance of a conventional asphaltic dense mixture (control) and three dense asphalt mixtures with modified asphalt cement with different rubber contents, wet-added, was evaluated by means of monotonic load tests (Marshall Stability) and dynamic (dynamic module). The physical and rheological evaluation of the AC modified with R indicates a significant increase in stiffness as a function of the R content. The asphalt mixtures studied, in reference to the control mixture, presented the same optimum content of asphalt and an increase in the Mar-shall rigidity and dynamic module. Therefore, it was found that the addition of rubber from military boots used in the asphalt cement and later in the mixture, can be considered viable from the technical and environmental point of view, due to the improvement in the mechanical properties of these materials and to allow a form of correct final disposal of the rubber.

Roundabout in urban arterials are likely to block roads or generate long queues of vehicles due to the constant changes on urban dynamics near to the interception. Several alternatives to modify the flow pattern or geometry and infrastructure need to be study previously to propose a final design solution of roundabout with traffic issues. In this study, a review of three alternatives to improve the operational traffic are discussed; signalized intersection, turbo-roundabouts and overpass/underpass. In addition, the application of these alternatives is evaluated in a “classic” roundabout located at Tunja city that has a maximum of 3691 Veh/h counted and it is operated in saturated condition. Microsimulation is used from a calibrated model with volume counted, vehicle composition and speeds in the VISSIM software. Results show that signalize the roundabout does not improve the operational traffic (with a reduction on 38% of approach speed) and, the turbo-roundabouts are a mid-term solution that meet the traffic demand on 15 years with a progressively loss of service (with a mean approach speed of 6.4 Km/h at 15 years). The constructions of underpass and overpass show to be the only solution that increase four times the travel speed throw the roundabout and keep acceptable speed at the end of cyclic live of intersection (18.7 Km/h at 20 years).

El presente artículo hace una revisión del estado del arte de las investigaciones sobre la resistencia de concretos con el uso de bloque de arcilla triturado como sustitución total del agregado grueso, se ha analizado los efectos del uso de este material desde las siguientes características: la durabilidad, resistencia a la compresión, la porosidad, el módulo de elasticidad, la tensión indirecta del concreto. También se presenta un caso de estudio de un establecimiento penitenciario donde se hace el análisis de resistencia de la compresión sobre una muestra de una columna interior del establecimiento. La revisión muestra que son insuficientes los resultados anunciados sobre el efecto neto del uso de triturado de bloque de arcilla como agregado grueso en las diferentes propiedades del concreto tanto en su estado fresco como endurecido. También se establece que los concretos derivados con agregados reciclados presentan menor resistencia a la compresión que las mezclas tradicionales.

El objetivo de esta investigación fue evaluar el comportamiento mecánico del asfalto natural por medio de la fabricación de muestras a temperatura ambiente. En primera instancia se realizó la caracterización del material con el ensayo de extracción cuantitativa del asfalto y así conocer el contenido de asfalto presente en el material, luego se procedió a fabricar muestras con la asfaltita pura en el compactador giratorio y por último se ejecutó sobre éstas el ensayo de Resistencia a Tracción Indirecta, RTI, en estado seco y en estado húmedo, para así conocer la viabilidad de su uso en vías terciarias, sin tener que someterla a altas temperaturas de fabricación y mezclado. Como resultado principal se evidencia que las probetas fabricadas a temperatura ambiente presentan resistencias muy bajas, por lo cual es necesario probar con la adición de agregados pétreos a la misma temperatura y emulsiones asfálticas.