On a possibility of determination of underground pipeline corrosion state by contactless methods

In the present article, an investigation carried out to diagnose the state of deterioration of a reticular type slab, located in the Historic Center of Oaxaca city Mexico, using non-destructive (TND) and semi-destructive (TSD) techniques, is described. The roof was built with an unconventional structural system, which consisted of the use of reticular beams, missing hollow block cases and a compression slab. During the visual inspection, various signs of deterioration in the structure were observed, such as: leaks, salt leaching, shedding of the rebar cover and corrosion of the reinforcing steel. Accordingly, the TND and TSD selected to perform the diagnosis of the state of deterioration of the structure were the following: estimation of the compressive strength (f´c), by means of sclerometry test and compression test in concrete cores, determination of the effects of salts leaching on the pH of the concrete, estimation of the amount and location of the reinforcing steel with a digital pacometer and estimation of the corrosion state in selected rebars by electrochemical testing. The results obtained revealed the feasibility of using NDT and SDT to reliably diagnose the state of deterioration of a reticular slab of reinforced concrete in a non-invasive manner.

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About the development of a method for remote determination of the underground pipeline insulation coating condition

Journal of Physics Conference Series ◽

10.1088/1742-6596/1889/2/022049 ◽

2021 ◽

Vol 1889 (2) ◽

pp. 022049

Author(s):

S A Nikulin ◽

E L Karnavsky ◽

S V Lartsov ◽

D G Repin

Keyword(s):

Underground Pipeline ◽

Insulation Coating ◽

Remote Determination

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ASSESSMENT OF THE DEPTH AND RATE OF CORROSION IN STEEL REINFORCEMENT OF REINFORCED CONCRETE CULVERTS

The 11th International Conference ENVIRONMENTAL ENGINEERING 11th ICEE SELECTED PAPERS ◽

10.3846/enviro.2020.831 ◽

2020 ◽

Author(s):

Alexandr Vasiliev ◽

Svetlana Daškevič

Keyword(s):

Reinforced Concrete ◽

Protective Layer ◽

Corrosion Damage ◽

Steel Reinforcement ◽

Operating Conditions ◽

Protective Properties ◽

Open Atmosphere ◽

Concrete Elements ◽

Corrosion State

Based on the results of many research years on concrete carbonisation: both immediately after manufacture (using heat-moisture treatment) and in reinforced concrete elements operated for the periods of various length (in an open atmosphere); the effect of carbonisation on the change in the protective properties of concrete in relation to steel reinforcement; for determination of the dependence of the corrosion state of steel reinforcement on the degree of concrete carbonisation in the area of steel reinforcement; the obtained regression dependences of the change (by time in the cross section) of the degree of concrete carbonisation of various classes in strength, – the analysis of the time of the onset of the boundary values of the degrees of concrete carbonisation (strength classes C12/15–C30/37) for the operating conditions of the open atmosphere was performed. Based on it, the regression dependences of the time variation of the depth of corrosion damage of steel reinforcement were construed (for fixed thicknesses of the concrete protective layer). The obtained nature of dependences made it possible to offer, in a general form, the regression dependences of the depth of corrosion damage and corrosion rate of steel reinforcement for concretes (strength classes C12/15–C30/37) for operating conditions in open atmosphere.

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