Browsing by Author "Chamorro, Alondra"
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- ItemAsset valuation of low-volume road networks - Application to Chilean unpaved roads(NATL ACAD SCIENCES, 2007) de Solminihac, Hernan E.; Hidalgo, Priscila; Chamorro, AlondraAsset management is a systematic process of maintenance, modernization, and operation of infrastructure assets in an economically efficient way. For these reasons, asset management has been considered as an emerging concept applied in the area of transport management. Many countries have developed procedures to evaluate pavement infrastructure assets; however, these applications generally have focused on main interurban and urban roads. The objective of this paper is to present a methodology to determine the asset value of low-volume roads and to quantify the impact of maintenance policies on such asset value. As a case study, the proposed methodology was applied to the unpaved road network of Chile, considering different maintenance policies and their impact on the evolution of the road network asset value. A complete analysis that considered the impact of maintenance policies under different budgetary conditions was performed. The analysis was done by using the HDM-4 program, since it performs technical and economic valuations considering a reposition value method. Relationships close to linear were found between final asset value of the unpaved road network under a 20-year valuation. Results showed that medium levels of investment are needed to maintain the network asset value. A small increase of the initial asset value of a network is obtained with high levels of investment. Asset valuation is a good and simple tool that helps agencies during a first-level management process. However, it is not recommended on its own as an optimization tool for the allocation of resources, as social costs and benefits associated with each investment strategy need to be considered.
- ItemDevelopment and Validation of a Method to Evaluate Unpaved Road Condition with Objective Distress Measures(NATL ACAD SCIENCES, 2009) Chamorro, Alondra; de Solminihac, Hernan; Salgado, Mauricio; Barrera, ErnestoThe condition of unpaved roads is commonly assessed by using qualitative distress measures. Some methods do not consistently consider the relative effect of multiple defects on road condition, or their application is limited to the conditions under which they were developed. In 2007, the Ministerio de Obras Publicas of Chile and a private consultant developed the Modelos de Deterioro de Caminos No Pavimentados study. The scope of the study was to gain experience with and understanding of unpaved road behavior. The main goal of the study was to develop and validate a method for evaluating unpaved road condition by using objective measures of distress, drainage, and profile characteristics. The scope was to design a versatile tool that was applicable to any location, followed a simple procedure, and used cost-effective survey techniques. The proposed approach is to define condition models from a questionnaire administered to a professional panel by applying the Delphi method. As a result of the study, equations representing the unpaved condition index (UPCI) and condition limits were developed for unbound gravel, stabilized gravel, and earth roads subject to three climates: dry, Mediterranean, and humid. UPCI equations and condition limits were validated successfully; the method to assess unpaved road conditions was reliable and versatile.
- ItemFragility curves for road embankments exposed to adjacent debris flow(2023) Nieto, Natalia; Chamorro, Alondra; Echaveguren, Tomas; Escauriaza Mesa, Cristian Rodrigo
- ItemImportance of Noncost Criteria Weighing in Best-Value Design-Build US Highway Projects(2021) Calahorra-Jimenez, Maria; Torres-Machi, Cristina; Chamorro, Alondra; Alarcon Cardenas, Luis Fernando; Molenaar, Keith
- ItemLong-term behaviour model of skid resistance for asphalt roadway surfaces(CANADIAN SCIENCE PUBLISHING, 2010) Echaveguren, Tomas; de Solminihac, Hernan; Chamorro, AlondraSkid resistance (SR) is relevant to road safety. Several researchers have showed that SR diminishes its value over time depending on the traffic-aggregated interactions, and the presence of heavy vehicles in the traffic stream. The classical SR model shows that its value drops from a starting value to an equilibrium value over time. However, this behaviour in low-volume roads is not entirely true. In this paper, an SR model in a single mathematic specification is proposed, which considers the polishing effect of heavy traffic through the polishing equivalence factor. The model was calibrated by using data measured with a SCRIM device from 1100 test sections in Chile. Considering speed and temperature factors calibrated for Chile, data were processed and corrected. It was concluded that the model for long-term behaviour of SR is satisfactory, but it is necessary to include the seasonal effects for a more realistic model.
- ItemStructured Approach for Best-Value Evaluation Criteria: US Design-Build Highway Procurement (vol 36, 04020086, 2020)(2021) Calahorra-Jimenez, Maria; Molenaar, Keith; Torres-Machi, Cristina; Chamorro, Alondra; Alarcon Cardenas, Luis Fernando