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- W28937307 abstract "Deterioration of concrete in a structure is a result of several internal and external degradation mechanisms which decrease the strength or the integrity of the structure. This paper presents results of use of non-destructive ultrasonic pulse velocity tests (UPV) to determine the strength of concrete in three different environments, namely oven-dry, air-dry and saturated conditions, asthe full potential of UPV in different environments is still not fully explored. Moisture is known to have a significant effect on ultrasonic pulse velocity. Inorder to improve the efficiency of UPV in estimating the concrete strength, thedegree of moisture present in the concrete i.e. the physical condition of theconcrete is to be considered. Pulse velocity path in the different physical conditions of concrete also has to be examined. In the present investigations, four different grades of concrete in three different environments wereconsidered. Extensive series of tests were carried out in the laboratory to obtaina correlation of the UPV test results with the actual compressive strength ofconcrete. A total of 108 cubes were cast. The cement used was the ordinary Portland cement and the coarse aggregate consisted of granite with themaximum aggregate size of 19mm as is generally used in conventional RCstructures. The DOE-method of mix-design was used to design four differentgrades of concrete in order to simulate concrete strengths found in practice.Test results indicated that the presence of moisture in concrete changes theUPV values significantly. The UPV tests through the direct transmissionmeasurements display better estimates compared to the indirect measurements.Exponential expressions have been proposed for the strength estimation ofconcrete under oven dry and air dry conditions." @default.
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- W28937307 date "2002-01-01" @default.
- W28937307 modified "2023-09-27" @default.
- W28937307 title "Strength Estimation of Concrete in Different Environments Using UPV" @default.
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