One of the challenges associated with dense hot-mix asphalt is its tendency to suffer long-term permanent deformation, especially under harsh traffic loads and extreme weather conditions. Moreover, when such deformation occurs, it often leads to a gradual loss of surface texture, rendering the pavement smooth and potentially endangering road safety.
The study evaluates the mechanical behavior of dense asphalt mixtures through laboratory permanent deformation tests conducted at 60 °C and a frequency of 1 Hz, using slabs compacted with a pneumatic compaction table. To compare the asphalt mixtures, aggregates sourced from the Amazon region (State of Pará) were used, along with petroleum asphalt cement (CAP 50/60) supplied by the Lubricants and Petroleum Derivatives Refinery of the Northeast (LUBNOR). The mixtures compared featured gradations within the limits of Band C defined by the National Department of Transport Infrastructure (DNIT), and gradation curves developed using the Fuller or Talbot equation, referred to as the practical curve (PC) and theoretical curve (TC), respectively. The findings indicate more satisfactory results for the theoretical curves when compared to the practical curve commonly used in the Amazon region.
With the emergence of new, more sophisticated mechanistic-empirical pavement design guides at the international level, we are compelled to study them and, where feasible, consider their implementation. However, are these guides truly applicable to Costa Rica? Were they conceived and developed for environmental conditions, loading scenarios, soil types, and materials similar to those found in our country? Clearly, the answer is NO.
In the present paper an evaluation of scour problems bridges of the Colombian National Highways has been developed; based on the principal inspection and inventory module of the Colombian Bridge Administration System (SIPUCOL), which has been implemented since 1996 by the National Highways Institute (INVIAS).
SIPUCOL has been an essential tool to maintain security and functionality of Colombian bridges. This article presents the amount, evolution and classification of damages, based on visual inspections, maintenance, studies performance and rehabilitation works.
In this document it has been included all the collapsed bridges which main cause of collapse has been scour. To prevent bridges failure risks, taking into account that scour is a complex problem, some recommendations have been made about the inspection methodology, the study’s quality and the analytic research implementation.
Various types of equipment have been implemented worldwide to measure the coefficient of friction on aircraft taxiways. In our case, special emphasis is placed on the use of the GripTester, a British-made device whose configuration allows for continuous data collection. It operates using a braked test tire with a slip ratio of 15%. Additionally, a constant flow of water is maintained to simulate a critical scenario for aircraft operations—namely, the presence of water on the runway.
The delivery time of a civil construction project is one of the most critical factors requiring thorough planning and control in order to achieve efficiency and effectiveness for the project owner. Every owner seeks to obtain the completed civil works as soon as possible—whether to sell, lease, or use the facility—thus allowing for an earlier return on investment or the fulfillment of commercial objectives. In the case of public works, the end user—the citizen who relies on roads, schools, or public hospitals—expects access to these services as soon as possible in order to meet their needs. In this way, the benefit of the public work is delivered to the region within the required timeframe, avoiding delays that could disrupt the provision of public services. In the field of transportation, roads completed within a reasonable period enable regional connectivity and facilitate the economic development of an area by improving the mobility of people, vehicles, and goods. On the other hand, when road construction projects experience significant delays, regional and national economic development is likewise hindered. (ref. No. 2 and No. 6)