Assessment of a tensile constitutive model considering various loading histories for early age concrete

Flexural tests were carried out under the several loading conditions, to verify a constitutive model subject to both hardening process and loading histories for early age concrete. A method of specifying the shape of a bilinear tension softening curve using a volume function produced from time-dependent changes in various material properties was proposed, with its validity being verified by comparison with test results. Then, a technique of superposing a stress-strain curve specified using the volume function for each time step was analytically verified using the Rigid-Body-Spring Model. This technique roughly reproduced the load-CMOD curves obtained from the tests, proving its validity.