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Volume 22, No. 39Journal 39, July-November 2020

DOI:https://doi.org/10.15517/hbh8aj65

Published November 17, 2025

Scientific Papers

  1. María Liliana Alba Menéndez, Oisy Hernández Menéndez (Author)

    Synchronization analysis of traffic lights using the software Synchro

    Traffic congestion is a problem that occurs worldwide, and Cuba is not exempt, even when the existing levels do not reach those reported by countries with high level of motorization. Signalized intersections in urban arteries of Havana are the most congested, which reflects negative impacts such as traffic accidents, delays, queue, and emission of pollutants into the atmosphere. A possible low-cost solution to decrease congestion is to coordinate the group of traffic signals. Therefore, this research aims to assess the efficiency of synchronized channels using parameters as cycle time, green intervals, and bandwidth for a case study using Synchro software. This research does not consider the minimization of delays of the users. The results support the feasibility of using these parameters to evaluate and select the design holding the most effective synchronization.

  2. Ana Sofía Figueroa Infante, Elsa Fonseca Santanilla (Author)

    Pavement performance with reclaimed asphalt pavement-RAP and recycled tire rubber-RTR

    This research shows the results on the flexible pavement performance (rutting and fatigue) using Reclaimed Asphalt Pavement-RAP and Recycled Tire Rubber. The two types of materials are waste that comes from different processes: the first one comes from recycling asphalt pavement and the second from disused tires due to wear and tear of different vehicles. The studies include analysis of the materials in the original condition and a proposal for improving the material, considering the reduced production of greenhouse gases. The product obtained in this project intended to be used in secondary and tertiary roads (rural roads) in Colombia, to improve the connection between agricultural production areas and urban centers in such a way that it contributes to the improvement and development of the competitiveness of these areas.

  3. M. Isabel Zambrano Mesa, Eduardo Tejeda Piusseaut, Anadelys Alonso Aaenlle (Author)

    Improved granular materials with cationic asphalt emulsion for pavement sub-bases

    The use of bases treated with hydraulic binders or asphalt binders has become a common solution in the construction of pavement bases or sub-bases due to the need to achieve high performance, and also because of the increment of the repetitions and magnitudes of loads in transportation. The treatment with additives provides greater resistance and behavior to the pavement layers over time. A granular material was selected with the purpose of evaluating the effectiveness of one of these treatments. This material did not meet the requirements of a road subbase because of its high plasticity. A cationic asphalt emulsion was incorporated to this granular material in order to check the variations that this treatment could experience regarding its resistance in the laboratory. Finally, good results were obtained with this treatment. An increase in resistance to CBR after immersion and conserved resistance were observed. The modifications produced after the treatments, are also shown by comparing a conventional flexible structure and a structure with a stabilized sub-base layer with an emulsion instead of a non-agglomerate traditional subbase, using an empirical-mechanistic procedure of AASTHO Design Guide.

Literature Review

  1. Karina Kikut Cruz, Alejandra Baldi, Ana Luisa Elizondo Salas (Author)

    Benefits of adding hydrated lime to asphalt mixtures: A review

    Hydrated lime is used as an additive for asphalt mixtures, since it enhances the properties of the material in a unique way, enabling a longer service life. In this study, several scientific articles were analyzed in order to understand some of the methods employed of adding hydrated lime to the asphalt mixtures, as well as the optimum amount of hydrated lime that will significantly improve the material’s response towards diverse factors. It was found that the researchers usually add hydrated lime in percentages ranging between 1%-2% in weight of aggregates. Also, in the case of asphalt modified with hydrated lime, the material is stiffer and more resistant to moisture damage. Finally, after this literature review it is concluded that adding 1,5% of hydrated lime the most promising properties were obtained in most of the studies considered.