The structural response and failure mechanisms of 35 used concrete sewer pipes are investigated by means a combined experimental–numerical approach, whereby specific attention focuses on determining the effect biochemical attack. Accordingly, degree degradation inner outer surfaces is carefully analysed visual inspection, subsequently categorized in 6 different surface condition classes. type a...

We discuss a reaction–diffusion system modeling concrete corrosion in sewer pipes. The system is coupled, semi-linear, and partially dissipative. It is defined on a locally-periodic perforated domain with nonlinear Robin-type boundary conditions at water-air and solid-water interfaces. We apply asymptotic homogenization techniques to obtain upscaled reaction–diffusion models together with expli...

The sewer inspection robot MAKRO is an autonomous multi-segment robot with worm-like shape driven by wheels. It is currently under development in the project MAKRO-PLUS. The robot has to navigate autonomously within sewer systems. Its first tasks will be to take water probes, analyze it onboard, and measure positions of manholes and pipes to detect polluted-loaded sewage and to improve current ...

This paper presents experimental and analytical work of which the main objective was to support introduction a new technology for production sewer pipes. In this technology, pipes produced consist two differently parts. The direct part uses conventional vibro press compacted concrete. curved part, on other hand, self-compacting concrete is used. cooperating company, Prefa Brno a.s., defined pos...

Abstract Sewer systems are an integral part of our modern civilization and imperative underground infrastructure asset that society relies on. In Western Europe alone, 92% the resident pollution is connected to sewer systems. This extensive coverage sewerage presents ideal habitation for microorganisms strive. Sewers can be considered continuous flow bioreactors. They always colonized by bacter...

Worldwide, millions of kilometres sewers are constructed from concrete pipes. Unfortunately, susceptible to corrosion biogenic hydrogen sulphide, and, though they may pass visual inspection, their ability hold together under load be degraded. This paper presents the design a teleoperated robot with protractible probe, that allows an operator apply localised selected points within sewer pipe. We...

Water distribution networks comprised of underground reinforced concrete pipes deteriorate with time due to environmental conditions, such as chloride-induced corrosion and differential soil movements [1]. If the pipes in these networks are not periodically replaced, they will eventually fail. Strategies for replacement for these pipes depend on 1) the risks associated with failure of a water d...

A chemo-mechanical model is presented for the simulation of biogenic sulphide corrosion in concrete sewer pipes. The chemical formulated terms a system coupled diffusion-reaction equations, which describe processes calcium hydroxide dissolution, silicate hydrate dissolution and gypsum formation. problem two-way with mechanical that captures damage caused by deformations, set numerical analyses ...