2D mesoscopic modelling of bar–concrete bond

A novel methodology for obtainment of compressive strength of concrete

“…In this analysis, finite element method was employed, and the numerical model was calibrated based on simplified experimental test. The results showed that chemo-hygrothermo-mechanical properties presents a large influence in the crack emergence and consequently for bond resistance between the RR-C [2].…”

“…However, the mechanism of adhesion between these two different materials results from association between the chemical, mechanical and friction adhesion [1]. According to Daoud et al [2] the bond existent at reinforcement bars and the surrounding concrete is indicate as the fundamental factor for reinforced concrete performance, and comprises an important aspect that should be taken into account during the structural assessment. Nonetheless, the bond between the rebars and the concrete can be affected by a large number of factor, as the water/cement relation, aggregates characteristics and cure conditions.…”

Meso-scale image-based modeling of reinforced concrete and adaptive multi-scale analyses on damage evolution in concrete structures

“…Many tests have been done to assess bond characteristics in RC structures. Most of the classical pull-out test does not allow a local measure but only global [15], such as the pull-out load versus slip curve from the experiment shown in Fig. 3.…”

“…And concrete is usually considered to be a three-phase heterogeneous material that consists of aggregates, matrix and ITZ in meso-scale [12]. And the bond between concrete and steel has been acknowledged as a key factor to the proper performance of RC structures [15]. Therefore, RC is considered to be consisting of reinforced steel, aggregates, matrix, ITZ between aggregates and matrix, and ITZ between concrete and steel in damaged zone as shown in Fig.…”

“…Therefore, in order to develop a comprehensive understanding of the failure mechanisms of concrete, it is necessary to consider the heterogeneous material structures. And numerical meso-scale models have proven to be the most practicable and useful method for studying the complex failure mechanisms of concrete due to its heterogeneity [15,16]. Various meso-scale models of concrete have been developed by Wittmann et al [17], Bazant et al [18], Schlangen and van Mier [19] and Leite et al [20].…”