Title:
Prediction of Modulus of Rupture of Concrete
Author(s):
Frederic Legeron and Patrick Paultre
Publication:
Materials Journal
Volume:
97
Issue:
2
Appears on pages(s):
193-200
Keywords:
compressive strength; cracking (fracturing); curing; flexural strength; serviceability.
DOI:
10.14359/823
Date:
3/1/2000
Abstract:
Tensile strength of concrete is an important parameter for determining deflection and minimum flexural reinforcement. Many design codes use the modulus of rupture as the cracking strength. Relations giving the modulus of rupture as a function of concrete compressive strength are based on tests on concrete with compressive strength lower than 40 MPa. This paper presents a statistical study on 395 data points from a large number of research programs with concrete compressive strength ranging from 20 to 130 MPa. It further reveals that the data is largely scattered and that minimum, mean, and maximum values for the modulus of rupture should be defined. New relations are proposed, giving the modulus of rupture as a function of ÷f¢cand f¢c2/3. The use of the new relations in design codes is illustrated.