This study presents an investigation to evaluate the crack propagation in the cracked concrete that is damaged due to alkali-silica reaction (ASR). We obtained the fracture energy and tension-softening curves of the ASR damaged concrete. Three-point bending tests for single notched concrete beams were carried out to determine the fracture properties. To detect the crack
This study aims at clarifying the effects of rebar rapture caused by ASR on the mechanical performance of RC members. Rapture of tensile or shear reinforcement was simulated in RC beam specimens, which were subjected to a bending test after deteriorated by ASR. Some of the beams were repaired by adding rebars, and the effects
The safety and durability of a large number of structures, especially in high humidity envi- ronments, are endangered by Alkali-Silica Reaction (ASR). ASR is characterized by two processes: the first is the formation of gel which happens when water transmitted alkali come in contact with reactive silica in aggregates; the second is the imbibition of
This study aims to evaluate the effects of alkali silica reaction (ASR) on mechanical behaviour of cement based materials. Two mortars are fabricated respectively with reactive and non-reactive aggregates. After a maturation period of 28 days, triaxial compression tests with confining pressures of 0, 5 and 15MPa and bending tests are performed on a part
This paper describes two constitutive models for concrete affected by alkali-aggregate reaction. One is plasticity based model and the other damage mechanics model. Examples of prediction using a finite element program incorporate the models also presented.
Alkali-Aggregate Reaction (AAR) is difficult to model due to the random distribution of the reactive sites and the imperfect lmowledge of these chemical reactions. A new approach, based on a probabilistic description of the main physical parameters of concrete and AAR, allows to simulate anisotropic swelling of concrete subjected to AAR. The concrete is modelled
Crack pattern induced by alkali-silica reaction (ASR) varies depending on environmental conditions, which affects the mechanical properties of concrete. This study aims to investigate the change in mechanical behaviors of ASR-damaged concrete with respect to acceleration temperature and crack pattern. Cylinder specimens were fabricated and immersed in 1 mol/L NaOH solution at two different temperatures,
Alkali-Silica Reaction (ASR) is a detrimental expansive reaction in concrete structures, such as dams and pavements, which substantially limits their structural lifetime. Silica present in the so-called ”reactive” aggregates reacts with calcium, hydroxyl and alkali ions of the pore fluid to form a hydrophilic alkali-silica gel. The gel fills pre-existing microcracks in the aggregates and
This study presents experimental investigations on the shear carrying capacity of RC beams in which alkaline silica reaction (ASR) of the concrete has occurred. In the experiments, RC beams with shear span effective depth ratio, a/d = 1.0, 2.5 and 4.5 were prepared. Before conducting a loading test, visual observation and measurements of the crack
In this study, the analytical system coupled with reaction producing model and expansion model for ASR and mesoscopic structural analysis was developed to evaluate both of expansion cracking behaviors and mechanical property change due to ASR. The proposed ASR model considered the random location of aggregates can simulate both of expansion behavior and cracking behavior.