A numerical method from the mesoscopic point of view is proposed to describe the fracture process of concrete. At mesoscopic level, concrete is considered as a three-phase composite consisting of mortar matrix, coarse aggregate and interfacial transition zone (ITZ) between them. According to the grading of coarse aggregate obtained from sieve analysis, the random aggregate models with polygonal...

ABSTRACT: Fracture tests on two high-performance concrete for pavements were performed using the wedge-split test. The results allowed perceiving same specific fracture energy both concrete. However, crack opening during as well characteristic length of materials resulted in roundly distinct behaviors terms brittleness. Previous fatigue studies concretes are then fairly readdressed pointing out...

For cementitious composites and materials, the sealing of fractures can occur in water by the precipitation of calcium compounds. In this study, the sealing behavior in a macro-fractured high-strength and ultra-low-permeability concrete (HSULPC) specimen was investigated in simulated seawater using micro-focus X-ray computed tomography (CT). In particular, the influence of fracture width (0.10 ...

The Adaptively Shifted Integration (ASI) technique, which produces the highest computational efficiency in the finite element analyses of framed structures including static and dynamic collapse problems, is applied to the seismic damage analysis of a reinforced concrete building. By expressing member fracture by a plastic hinge located at the exact position with a simultaneous release of result...

The equivalent linear elastic fracture model based 0:;': an R-curve (a curve characterizing the variation of the critical energy release rate 'WIth the crack propagation length; IS generalized to describe both the rate effect and size effect observed in concrete. rock or other quasi brittle matenals. It is assumed that the crack propagation velocity depends on the ratio of the stress intensity ...

Results of an cxperimelllal srudy ,,(fatiguefmelllre of geometrical/y similar high·strength concrete specimens of ven different si~es are reported and anal\'~ed. Three·poilll bend notched hean1.1 1.5. 4.24. and J:! in. deep were subjected 10 eselic loading H'ith a "m'er load limit of O.07Pc and an upper limiT het1l'een 0.73 and O.1!4 Pc. where Pc = maximum load ill monOlonic loading. The number...

The Mixed Mode fracture behavior of concrete is measured and characterized by investigating a single crack in a double-notched specimen. To obtain the characterization a very stiff biaxial test set-up with a closed loop control is constructed. The opening and sliding components of the Mixed Mode displacement are measured using a specially designed orthogonal gauge, and the measurements are used...

This paper describes a combined fracture–plastic model for concrete. Tension is handled by a fracture model, based on the classical orthotropic smeared crack formulation and the crack band approach. It employs the Rankine failure criterion, exponential softening, and it can be used as a rotated or a fixed crack model. The plasticity model for concrete in compression is based on the Menétrey–Wil...