Abstract
The organoleptic examination proves a significant degree of structural disintegration of concrete - some loosely embedded aggregate grains easily fall out when touched. The vertical range of the above changes includes a zone up to approx. 60 cm above the wastewater level, i.e. thea zone of fluctuations in the level of wastewater and a spray-gas zone. In the case of the tank 01/1 this means the full usable height of the tank, which may mean in the longer term the propagation of damage to the lower surface of the roof.
Highlights
Reinforced concrete tanks in wastewater treatment plants are designed for a minimum service life of 50 years
The internal surface of such tanks is exposed to many aggressive factors, including those usually corresponding to exposure classes XA3 and XF2 [1]
In the municipal sewage treatment plant, which is the subject of this paper, considerable concrete damages were found in the walls of some reinforced concrete tanks after three years of their use
Summary
Reinforced concrete tanks in wastewater treatment plants are designed for a minimum service life of 50 years. In the municipal sewage treatment plant, which is the subject of this paper, considerable concrete damages were found in the walls of some reinforced concrete tanks after three years of their use. − general assessment of the technical condition of internal concrete surfaces of pretreatment tanks on the basis of the inspection,. − analysis of the environmental factors affecting concrete in the structure, including laboratory tests of sewage samples collected at various stages of the technological. - concrete tests, including: − macroscopic surface evaluation, − estimation of concrete composition, − assessment of compressive strength based on core drilling, − evaluation of the homogeneity of mechanical features on the basis of sclerometer tests, − assessment of surface tensile strength, − assessment of resistance to freezing and thawing, − analysis of the causes of damages on the basis of the results of material tests and the results of the analysis of the environment. For the purpose of comparison, selected diagnostic activities were carried out simultaneously in one of the tanks in which no signs of concrete destruction were found during the initial inspection
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