ISSN: 0149-6123
Page Count: 10

Non-Destructive Tests for the Evaluation of Concrete Exposed to High Temperatures
Di Maio, A
Mechanical engineer, Professor at the Civil Engineering Department of the Technological University of La Plata (UTN). Research engineer, CONICETLEMIT,

Giaccio, G
Construction engineer, Professor at the Civil Engineering Department of La Plata University (UNLP). Research engineer, CIC-LEMIT,

Zerbino, R
Civil engineer, Professor at the Civil Engineering Department of La Plata University (UNLP). Research engineer, CONICET-LEMIT,

(Received 6 February 2002; accepted 9 August 2002)

Abstract

This paper presents a discussion on the use of non-destructive tests (NDT) for the evaluation of concretes damaged by exposure to high temperatures. The main analysis is based on the relationships between strength, modulus of elasticity and ultrasonic pulse velocity. Rebound hammer, break-off, and resonant frequency were also used. Tests were performed on concretes, prepared with different types of coarse aggregates and cements, with strength levels between 20 and 60 MPa. Exposure variables included maximum temperature (150°C to 700°C), time of exposure and the cooling rate. The obtained results indicate that, contrary to what happens with strength, the ultrasonic pulse velocity is a very good tool for the estimation of the static modulus of elasticity of thermally damaged concretes.

Keywords:
compressive strength, concrete, dynamic elastic modulus, high temperatures, static elastic modulus, ultrasonic pulse velocity

Paper ID: CCA10530J
DOI: 10.1520/CCA10530J
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