Title:
Methodology for Predicting Concrete Strength after Short- Term Heat Exposure
Author(s):
Stephen Wright and Laura Redmond
Publication:
Materials Journal
Volume:
120
Issue:
6
Appears on pages(s):
33-46
Keywords:
concrete strength; heat exposure; predictive model; residual strength; short duration
DOI:
10.14359/51739145
Date:
12/1/2023
Abstract:
Exposure to high temperature is well known to cause concrete
degradation and lead to compressive strength loss. However, most
research focuses on concrete exposed to high temperatures for more
than 1 hour, and the available predictive equations for concrete
strength loss due to heat exposure do not consider the effects of
concrete thermal mass or account for variation in concrete thermal
properties. This work proposes a methodology to create a predictive
equation for the compressive strength loss in concrete exposed
to heat. The proposed method leverages concrete temperature data
from transient thermal analyses of concrete specimens correlated
to results from experimental testing. The resulting equation from
the analyzed data set predicted compressive strength loss with a
root-mean-square error (RMSE) of 1.35% absolute error of the
measured strength loss, and the maximum absolute underprediction
in strength loss was 12.4% across all 26 cases examined.