Restraint Effect of Reinforcing Bar on ASR Expansion and Deterioration Characteristic of the Bond Behavior

Abstract

To investigate the restraint effect of reinforcing bar on the expansion induced by alkali-silica reaction (ASR), and assess the mechanical behavior of reinforced concrete (RC) structure damaged by ASR, pullout tests of specimens with different ASR expansion were conducted. Accelerated ASR tests of specimens with diameters of 12 mm, 16 mm, and 20mm were conducted to qualify the restraint effect of reinforcing bar. Pullout tests were used to investigate the relationship between nominal bond strength and ASR expansion. Test results show that ASR expansion decreases with the increase of the rebar diameter. Nominal bond strength of specimens increased initially to attain their peak at 14 days, approximately with the expansion of 0.035%. After that, the nominal bond strength decreased near-linearly with the increment of the expansion. A simplified ASR expansion model integrated with the poro-mechanical model was adopted to analyze the restraint effect. The verification of the proposed method was conducted by comparing the analytically predicted results with the test data. The results show that the proposed method could accurately predict both the ASR expansion and bond strength.

Benchmark Finite Element Calculations for ASCET Phase III on a Reinforced-Concrete Shear Wall Affected by Alkali-Aggregate Reaction

“…this phenomenological difference, the observed concrete properties, such as fracture energy in the compression zone or the cohesion of the AAR concrete, would then certainly vary widely from the properties of regular concrete. It is also possible that the deteriorated bond between the reinforcing bars and the concrete due to AAR, which has been experimentally confirmed such as research by Li et al (2020) could explain this discrepancy.…”

“…An alkali-aggregate reaction (AAR) is a pathology of degraded concrete. It is a common issue in the concrete structures of nuclear facilities as well as in general civil infrastructure (Hayes et al 2018;Kawabata et al 2018aKawabata et al , 2018bTakahashi et al 2018;Pourbehi and van Zijl 2019;Li et al 2020). In Japan, the reinforced-concrete (RC) turbine generator foundation of the Ikata nuclear power plant (NPP) Unit 1 of Shikoku Electric Power exhibits expansion as a result of AAR, as reported by Manabe et al (2016).…”

Time-Dependent Deformation of a Concrete Arch Dam in Thailand - Numerical Study on Effect of Alkali Silica Reaction on Deflection of Arch

“…Furthermore, the effect of reinforcement steel has not been accounted for in this study, mainly owing to the lack of data and its low percentage. A recent study has shown that steel can partially resist the expansion and provide safety against cracking when the ASR is at its early age, that is, when the stress level is low (Li et al 2020). This will provide additional safety against crack formation in future.…”

A method to analyze the long-term durability performance of underground reinforced concrete culvert structures under coupled mechanical and environmental loads

“…This enables the simultaneous calculation of mechanical and environmental loads. Following years of development and application, the finite element program has been extensively studied in the context of load-bearing capacity analysis and durability analysis of RC structures, among other areas [28][29][30][31][32]. Takahashi et al [33] investigated the impact of gel migration on concrete alkali-silica reaction (ASR) expansion using a multiscale pore mechanics calculation method.…”