Great Man Made River Authority (GMRA) The Role of Acoustic Monitoring in the Management of the Worlds Largest Prestressed Concrete Cylinder Pipe Project

Essamin, Omar; Holley, Mark

doi:10.1061/40745(146)28

Cited by 10 publications

(4 citation statements)

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“…Five pipe failures have occurred due to corrosion since their installation. This project conveys water through an extensive network of nearly 4000 kilometers of Prestressed Concrete Cylinder Pipe (PCCP) infrastructure [3,11,12] .…”

Section: Fig 1: Acoustic Emission Testingmentioning

confidence: 99%

Experimental Investigation of Steel Corrosion in Concrete Structures by Acoustic Emission Analysis

Elfergani

2024

sjuob

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Corrosion represents a significant issue in various structures, with reinforced and prestressed concrete particularly susceptible. In certain applications, it demands specific attention and mitigation strategies, special attention must be paid to ensure that failure does not occur, as it could lead to loss of life and incur significant financial expenses. This paper examines the role of Acoustic Emission (AE) as a non-destructive testing (NDT) technique for reinforced concrete structures. The work focuses on the development of experimental techniques and data analysis methods for the detection, location, and assessment of AE from reinforced concrete specimens due to steel wire corrosion. The results reveal that AE can be used to detect the onset of corrosion activity in wire in the interface between prestressed concrete and mortar as found in prestressed concrete pipes. It has been shown that by using AE and the relationship between RA and AF value, the crack area can be located and identified. Hence, it could be possible to provide a corrosion alarm and location prior to any wire breaks. Furthermore, the results offer encouragement for the use of the AE technique to detect early corrosion and macro cracks in large concrete pipe structures.

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Section: Fig 1: Acoustic Emission Testingmentioning

confidence: 99%

Experimental Investigation of Steel Corrosion in Concrete Structures by Acoustic Emission Analysis

Elfergani

2024

sjuob

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“…Just 5% of the entire area of Libya exceeds 100 mm annually. Evaporation rates are also high, ranging from 1,700 mm in the north to 6,000 mm in the south 1 .…”

Section: Introductionmentioning

confidence: 95%

Survey of Sustainable Development to Make Great Man-Made River Producing Energy and Food

Nasar

2015

Curr. World Environ

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The Great Man-Made River (GMR) is the world largest irrigation project, consisting of a network of pipes that supplies water from Libyan desert in the south to the coastal areas in the north. This paper studies the possibility of taking advantage of GMR to generate energy and produce food through agriculture. Hydro-kinetic power generation, would be carried out by generating energy from water movements across Great Man-Made River pipelines using appropriate sizes of turbines. It's known that the length of the GMR pipeline is about 4000 km with a diameter of 4 m. Pipeline of such magnitude with great water flow rate would make a turbine to produce hundreds of Kilowatts of clean energy. The most significant reasons that force us to take advantage of GMR to generate energy are: a) The needs to sustainable environmental energy source; b) Power System uses energy of flowing water to provide a consistent, controllable, non-weather-dependent source of electricity, such as other types of renewable energy, which are depend on the weather. The conversion of GMR, from supplying freshwater to coastal cities, to huge agricultural project after the establishment of many seawater desalination plants (solar powered) would cover the needs of cities for fresh water. Thus it would become possible to convert thousands of desert hectares around the pipelines to huge agricultural project irrigated from GMR.

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“…Initially traditional techniques such as potential mapping, tapping and close-interval potential surveys were used to make a vast survey of the current pipelines. Then, experts used electromagnetic inspection and acoustic monitoring was used to inspect and monitor the rate of deterioration of pipes [6]. The time and location of wire break events can be determined by this method, however the detection of corrosion was not considered.…”

Section: Introductionmentioning

confidence: 99%

“…The purpose of the project is to transform thousands of hectares of semi-desert into rich fertile agricultural land. [1,5,6] Pre-stressed concrete cylinder pipes are designed to take best advantage of the compressive strength and corrosion-inhibiting property of Portland cement concrete and mortar and the tensile strength of prestressing wire. Each transportation line pre-stressed concrete cylinder pipe is mainly 4.0 m in inner diameter; with a length of 7.5 m, and over 70 tonnes in weight.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Emission Analysis of Prestressed Concrete Structures

Elfergani

Pullin

Holford

2011

J. Phys.: Conf. Ser.

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Abstract. Corrosion is a substantial problem in numerous structures and in particular corrosion is very serious in reinforced and prestressed concrete and must, in certain applications, be given special consideration because failure may result in loss of life and high financial cost. Furthermore corrosion cannot only be considered a long term problem with many studies reporting failure of bridges and concrete pipes due to corrosion within a short period after they were constructed. The concrete pipes which transport water are examples of structures that have suffered from corrosion; for example, the pipes of The Great Man-Made River Project of Libya. Five pipe failures due to corrosion have occurred since their installation. The main reason for the damage is corrosion of prestressed wires in the pipes due to the attack of chloride ions from the surrounding soil. Detection of the corrosion in initial stages has been very important to avoid other failures and the interruption of water flow. Even though most non-destructive methods which are used in the project are able to detect wire breaks, they cannot detect the presence of corrosion. Hence in areas where no excavation has been completed, areas of serious damage can go undetected. Therefore, the major problem which faces engineers is to find the best way to detect the corrosion and prevent the pipes from deteriorating. This paper reports on the use of the Acoustic Emission (AE) technique to detect the early stages of corrosion prior to deterioration of concrete structures. IntroductionSeveral structures e.g. bridges, buildings, concrete pipes, strong tanks, dams, nuclear reactor protective shells, railway sleepers, piles and pressure vessels are made of prestressed concrete in which prestressing steel wires are put into a permanent state of tension to compensate for the inadequate tensile strength of the concrete. Tensile cracking in the concrete is minimised by ensuring that the concrete is in compression under normal working loads by prestressing the steel reinforcement. Generally prestressed steel is between four to five times stronger than mild steel. The main advantages of prestressed concrete structural materials are that they are stronger, lighter and "crack free" [1] and hence these materials offer cost benefits over other materials. Corrosion is a big problem in numerous structures. The cost due to corrosion is estimated in billions of dollars every year. Department of Transport in the UK evaluated that, the cost of recondition of concrete structures damaged by corrosion problems is £755 million a year [2]. The problem of corrosion in this type of structure must be given special consideration because failure may result in the worst scenario a loss of life but at a minimum a loss in finance. Most studies indicate the main reason of failure of bridges and concrete pipes is due to corrosion during the short period after they were constructed. The concrete provides the ideal environment to protect the steel wires which are

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Great Man Made River Authority (GMRA) The Role of Acoustic Monitoring in the Management of the Worlds Largest Prestressed Concrete Cylinder Pipe Project

Cited by 10 publications

References 0 publications

Experimental Investigation of Steel Corrosion in Concrete Structures by Acoustic Emission Analysis

Experimental Investigation of Steel Corrosion in Concrete Structures by Acoustic Emission Analysis

Survey of Sustainable Development to Make Great Man-Made River Producing Energy and Food

Acoustic Emission Analysis of Prestressed Concrete Structures

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