Sewer system is fundamental urban infrastructure for the public sanitation. Construction of sewer system is needed to invest a huge amount of capitals and labours as well as generates various and wastes and atmospheric emissions, and hence sewer pipes should be appropriately managed in the environemental aspect which is analysis of greenhousegases(GHGs) emissions. In this study, we investigated...

We present two multiscale reaction-diffusion (RD) systems modeling sulfate attack in concrete structures (here: sewer pipes). The systems are posed on two different spatially separated scales. The only difference between them is the choice of the micro-macro transmission condition. We explore numerically the way the macroscopic Biot number Bi connects the two reactiondiffusion scenarios. We ind...

We use the periodic unfolding technique to derive corrector estimates for a reaction-diffusion system describing concrete corrosion penetration in the sewer pipes. The system, defined in a periodically-perforated domain, is semi-linear, partially dissipative, and coupled via a non-linear ordinary differential equation posed on the solid-water interface at the pore level. After discussing the so...

If all parameters influencing sewer performance were known (or deterministic) then the decision making process associated to the planning of sewer replacement should be relatively straightforward. However, when trying to forecast service life, uncertainties arise considering the deterioration process, the variability of sewer pipe properties, environmental conditions or the used information res...

An algorithm for online distance computation based on images taken in a sewer by a robot-inspector is presented. Modern concrete sewers are made of standard cylindrical pipes separated by manhole junction areas. Circular structures typically originate at the pipe ends and entrances as well as at the joints of the pipe sections. These structures provide regular marks on the sewer images and can ...

To identify voids around underground concrete sewer pipes, a few studies have introduced conducting in-pipe Ground Penetrating Radar (GPR) inspection systems along the pipes. However, less research has focused on studying implications of emission, propagation, and reception electromagnetic waves in enclosed environment pipes their subsequent impact resulting radargrams. We defined simulation sc...

The National Research Council Canada (NRC) has recently completed a project to assist the City of Montreal in determining the condition of its water and sewer system. NRC staff members reviewed available and developing diagnostic techniques for both systems, conducted experiments on non-destructive evaluation methods and provided general scientific advice during the course of the project. This ...

The structural failure of round and egg-shaped sewer pipes is investigated by means laboratory experiments finite element method analyses. Two different are considered, which have an inner diameter 400 mm 500 mm, respectively referred to as R400 R500 pipes. pipe considered in this study has a horizontal vertical 600 labeled the E400/600 pipe. Sewer with these dimensions most commonly used Nethe...

The advent of smart sensing technologies has opened up new avenues for addressing the billion dollar problem in the wastewater industry of H2S corrosion in concrete sewer pipes, where there is a growing interest in monitoring the environmental properties that govern the rate of corrosion. In this context, this paper proposes a methodology to predict the moisture content of concretes through dat...