Evolution of spalling with time and age

Title: Evolution of spalling with time and age
Author(s): C. Lenglet
Paper category : conference
Book title: 2nd International RILEM Workshop on Concrete Spalling due to Fire Exposure
Editor(s): E.A.B. Koenders and F. Dehn
ISBN: 978-2-35158-118-6
e-ISBN: 978-2-35158-119-3
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 19 - 24
Total Pages: 6
Nb references: 1
Language: English

Abstract: In order to measure the spalling depth on a given concrete mix, tests have to be performed. Tests are conceived in order to reproduce as well as possible the structural element, but a lot of problems are still opened.

In particular, spalling is measured enough time after the test so that the element cools down. During the test, only visual observations inform on when the phenomenon starts and ends. There is no experimental method to measure the evolution of spalling as a function of time. Therefore, for design purposes, the spalling measured at the end of the test is taken into account since the beginning of the fire, and we wondered if it was not overestimated. As far at it has been observed, spalling can start during the first minutes, but we wanted to know more precisely to what extent it goes on with time.

Another issue is the effect of aging. Usually, for schedule reasons, tests are performed after the minimum drying time, which is three months. The structure is designed with the amount of spalling measured at that age, and we wanted to verify if it was conservative, meaning that spalling diminishes with the age of concrete.

Online publication: 2012-01-17
Publication type : full_text
Public price (Euros): 0.00