Non-Destructive Evaluation and Laboratory Testing of a Concrete Structure Damaged by Fire

Abstract

This article discusses the use of non-destructive and subsequent laboratory materials testing techniques in evaluation of extent of fire damage to a precast prestressed parking structure. The non-destructive and laboratory testing findings were used in determination of extent of heat damage to concrete and potential effects on the pre-stressing tendons. The in-situ non-destructive testing phase consisted of locating affected areas using ultrasonic pulse velocity through concrete members in the vicinity of the fire. Subsequently cores were removed and Young's Modulus of 25mm (1 inch) thick concrete disks was determined by utilizing non-destructive measurement of resonant frequency. Determination of Young's Modulus at small depth increments permitted assessment of the heat induced damage front into the concrete and more importantly at the level of the pre-stressing tendons. Based on the extent of damage identified, repairs were performed on the affected members.

Treatment of Determination Method for Strength Characteristics of Reinforcing Steel by Using Thread Cutting Method after Temperature Influence

“…Non-destructive evaluation and laboratory studies of fire-damaged reinforced concrete structures are given in [10]. The application of methods of non-destructive testing and further laboratory examination of materials in assessing the degree of damage to the prefabricated structure by fire is considered.…”