Browsing by Author "Gonzalez, Alvaro"
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- ItemAssessment of the sustainability of asphalt pavement maintenance using the microwave heating self-healing technique(ELSEVIER SCI LTD, 2022) Nalbandian, Kevork Micael; Carpio, Manuel; Gonzalez, AlvaroPavements are the major load-carrying Civil Engineering structures in roads, runways, parking lots, and driveways; hence, they are fundamental for regional or national development. However, the pavement life cycle has significant environmental, economic, and social impacts. The asphalt pavement microwave heating self-healing technique (MWHSHT) is a relatively new alternative to traditional pavement maintenance techniques. Research has mainly focused on its technical feasibility with little attention to its effect on economic, environmental, and social sustainability. This work assesses the sustainability of asphalt pavement maintenance using the MWHSHT through an environmental and socio-economic impact analysis for various scenarios. Results show that pavement maintenance alternatives that include MWHSHT show reductions in energy consumption, feedstock energy, materials consumption, and economic indicators compared to full traditional maintenance during the asphalt pavement life cycle, thus increasing pavement sustainability. In addition, the inclusion of the MWHSHT has potential social benefits for stakeholders. Overall, including the MWHSHT for maintaining asphalt pavements has the potential to improve the economic, environmental, and social aspects of sustainability in comparison to using only traditional asphalt pavement maintenance.
- ItemEnergy consumption comparison for different asphalt pavements rehabilitation techniques used in Chile(ELSEVIER SCIENCE BV, 2007) Thenoux, Guillermo; Gonzalez, Alvaro; Dowling, RafaelIn developing countries without the availability of reliable pavement management systems, recycling techniques may offer the best alternative for pavement structural rehabilitation. However, for many government officials and contractors there is a clear understanding of the technical advantages of recycling but not a clear perspective of cost saving. Since cost is a relative value among different regions of any country the following work makes an energy analysis of the construction process of the three different rehabilitation techniques available in Chile. Three different structural pavement rehabilitation alternatives were studied and compared using an energy consumption methodology:
- ItemInterpretation of laboratory and full-scale testing of New Zealand foamed bitumen pavements using finite-element modelling(TAYLOR & FRANCIS LTD, 2012) Gonzalez, Alvaro; Cubrinovski, Misko; Alabaster, David; Thenoux, GuillermoA large research project on foamed bitumen (FB) stabilisation was conducted in New Zealand. The project consisted of an extensive laboratory and full-scale testing of FB pavements. The objective of this paper is to interpret the performance of FB pavements by using finite-element (FE) modelling. The mechanical properties of the materials were calculated using testing data and used as material inputs in the FE modelling. The MohrCoulomb and DruckerPrager material models were adopted to calculate plastic deformation, which is related to pavement rutting. Results of the modelling indicate that increasing the FB content increases the tensile strength and modulus of the pavements, reducing the plastic deformations in the subgrade and the stabilised layer. In addition, adding FB reduces sensitivity to rutting when pavement is overloaded or the asphalt surface layer is cracked.
- ItemPatient volume, medical and nursing staffing and its relationship with risk-adjusted outcomes of VLBW infants in 15 Neocosur neonatal network NICUs(SOC ARGENTINA PEDIATRIA, 2010) Grandi, Carlos; Gonzalez, Alvaro; Meritano, Javier; Grp Colaborativo NeocosurIntroduction. Few studies have attempted to evaluate the relationship between medical and nursing staffing and neonatal outcomes providing inconclusive evidence. The purpose was to assess whether morbidity and mortality of VLBW infants are associated with levels of patient volume, provision and training of medical and nursing, and if exist differences between public and private centers.