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...

The main objective of designing this robot is simplify the challenge of climbing on the high buildings, trees, etc. which is almost impossible for humans. Our target is to build a wall-climbing robot that can climb walls, walk on ceilings, crawl through pipes and traverse on floors for which we have used a different technology of Attraction Force caused due to Bernoulli’s effect. This paper pro...

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...

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...

Between November 1994 and October 1996 a total of 12 samples were collected in order to characterise wastes discharged from the Frutarom complex. The study focused on two principal discharge pipes, one in front of the VCM tanks and a second shorter pipe discharging in front of the main plant. Discharges from this second pipeline had been discontinued by 1996. In 1994 a third discharge, arising ...

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...

Unreinforced concrete pipes basically can fail in two modes: beam failure and ring failure. According to the existing test data, the nom· inal stress at beam failure is much less than that at ring failure. Fur· thermore, the nominal stress for either failure mode decreases as the pipe diameter or thickness increases. These size effects can be de· scribed in a unified manner by means of the rece...

Elevated rail transit has been developed in some big cities in China in recent years. However, specialized codes for design of the bridges in the elevated rail transit system have not yet been established. Based on the prestressed concrete (PC) box girder bridges on Guangzhou metro line 4, some technical features of design principle and technology requisition, ensemble plan and design load of b...