Resilience surface for quantifying hazard resiliency of transportation infrastructure

Resilience assessment of transportation infrastructure is a crucial aspect of ensuring the continued functionality of a city or region in the face of various disruptions.However,these infrastructures are also vulnerable to various types of disruptions,such as natural disasters.The ability of transportation infrastructures to withstand and recover from such disruptions is referred to as their resilience.This research presents a comprehensive framework to develop the resilience surface for assessing the resilience of transportation infrastructure such as bridges,roads,and tunnels.The framework involves the identification of the unique damage configurations through performing the fragility analysis,and the restoration of the infrastructures through developing recovery curves for each damage configuration by considering the relevant restoration data.The framework also considers the inherent uncertainty in the hazard intensity,modeling uncertainty,and restoration process.The framework is illustrated through the application to a case study of a highway bridge in Canada.The aim of this paper is to provide a useful tool for decision-makers to evaluate and improve the resilience of transportation infrastructures.

Developing A Framework for Low-Volume Road Implementation of Pervious Concrete Pavements

Pervious concrete pavement is one of the promising pavement technologies,as it can help overcome traditional pavement environmental impacts,assist with stormwater management,and provide an effective low impact development solution.There are many benefits associated with pervious concrete pavement such as assisting with water filtration,absorbing heavy metals and reducing pollution.The most significant aspect,which draws the attention of environmental agencies and cities and municipalities,is its ability to reduce storm water runoff.Pervious concrete is documented as the paramount solution in storm water management by the United States Environmental Protection Agency.Though it has been used in the southern United States for years,the practice of using pervious concrete is more recent in northern climates where freeze thaw is observed.In Canada,several pervious concrete parking lots have been constructed over the past few years.However barriers exist for implementing the technology,as designers are not always fully informed on the various functional and structural design considerations.In this paper,a framework is developed to identify how pervious concrete can be integrated into lowvolume infrastructure.This paper also summarizes the structural performance and drainage characteristics of pervious concrete parking lots constructed in various provinces of Canada,demonstrating the viability of pervious concrete for low-volume northern applications.

Improving the Selection of Virgin Binders for Recycled Hot Mixtures in Ontario

The design of Recycled Hot Mixtures(RHM)in the United States is based on the guidelines provided by the National Cooperative Highway Research Program(NCHRP)Report 452.However,the extreme climatic characteristics in Canada require a validation on the selection of the virgin binders especially for Superpave Surface layer mixtures.This paper shows the results of a laboratory characterization of twelve conventional Superpave 12.5 mm mixtures,four of them with high Reclaimed Asphalt Pavement(RAP)content.Thermal Stress Restrained Specimen Test(TSRST)was conducted on triplicate samples for each mixture,and also the continuous grades for the binders were obtained.The findings were compared with the recent guidelines provided by the NCHRP Report 752.Dynamic modulus was performed and used to determine the critical temperatures of the blended binder without extraction.The analyses suggest that the virgin binder could be selected based on the critical temperature of the climate zone and the RAP content,and that the use of softer binders could not guaranty that the mixtures have the desired performance to low temperature cracking.