Abstract
This paper presents the results of an experimental investigation on the relationship between strength and ultrasonic pulse velocity (UPV) of concrete exposed to high temperature, especially for a decision of building remodeling of concrete structures. The experiments were conducted at three different initial compressive strength levels for temperature up to 800°C. UPV, Compressive, and splitting tensile tests and UPV measurements were performed for unheated and heated concrete specimens. The measured UPV values in the present work were correlated with compressive and tensile strengths to estimate the strength of concrete. Based on the results, two linear equations for predicting compressive and tensile strength of concrete at elevated temperatures using UPV have been proposed. It is found that the difference of initial compressive strength of concrete does not have a significant effect on the strength reduction ratio after exposed to high temperatures. In addition, the reduction factors of compressive and tensile strengths in the present work do not well comply with the values of suggested by EN 1992-1-2.
Highlights
The strength variation of concrete subjected to elevated temperatures widely depends on many factors which includes degree of exposed temperature, time of duration, initial compressive strength, mixing proportions of concrete and so on
The obtained compressive strength in this study showed a good relationship with the direct ultrasonic pulse velocity (UPV) measurement than the indirect UPV measurement
The effect of different initial mix design strength on the relationship between UPV and strength of concrete subjected to high temperature was investigated
Summary
The strength variation of concrete subjected to elevated temperatures widely depends on many factors which includes degree of exposed temperature, time of duration, initial compressive strength, mixing proportions of concrete and so on. It is well known that concrete at elevated temperature brings a significant loss of mechanical properties such as compressive strength, tensile strength, and elastic modulus.[1,2] The strength assessment of concrete for fire-damaged concrete structures is important for a decision of remodeling, repairing, strengthening, or demolishing of concrete structures. A reasonable strength assessment of concrete after subjected to fire is very important work for structural sustainability of the fire-damaged concrete structures. In the strength assessment of concrete, the primary test usually has been carried out by concrete core samples taken from the damaged concrete. The strength test on core samples (destructive test) is well known a typical method and the most
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