Viscoelastic stress modeling in cementitious materials using constant viscoelastic hydration modulus

摘要: Viscoelastic stress modeling in ageing cementitious materials is of major importance high performance concrete low water cement ratio (e.g. w/c ~0.35) where crack resistance due to deformation restraint needs be determined. Total analysis complicated by the occurrence internal stresses shrinkage, which requires estimating relaxation effect from tensile creep. This study presents a new and direct methodology for viscoelastic based on measurement hydration modulus. Autogenous if restrained, creates an condition uniform within cross section. shrinkage develop porous products. They are compressive restrained reinforcement net develops. Results show that modulus approximately 8000-9000 MPa constant material property. can now separated into two components, elastic Young’s (typically range 28000-34000 MPa) (time-dependent) timedependent strains (creep shrinkage). The reducing paste content control demonstrated using Pickett’s model.