Effect of alkali silica reaction on the mechanical properties of aging mortar bars: Experiments and numerical modeling

Pathirage, Madura; Bousikhane, Faysal; D'Ambrosia, Matthew D.; Alnaggar, Mohammed; Cusatis, Gianluca

doi:10.1177/1056789517750213

Cited by 46 publications

(20 citation statements)

References 85 publications

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“…As shown in Table 5, the compressive strength of concrete increased initially to attain their peak at 28 days of immersion. The change of compressive strength will decrease the negative effect of ASR (Pathirage et al 2019).…”

Section: Relationship Between Asr Expansion and The Nominal Bond Strementioning

confidence: 99%

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

Tan

et al. 2020

ACT

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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.

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Section: Relationship Between Asr Expansion and The Nominal Bond Strementioning

confidence: 99%

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

Tan

et al. 2020

ACT

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“…For details on the calibration and validation of this theory see [39]. This model was coupled in many research works with LDPM to successfully represent and predict concrete long term behavior under coupled shrinkage, creep, ASR degradation [76,77,34,35,36,78,79,32,33].…”

Section: Coupling With the Htc Modelmentioning

confidence: 99%

Coupled multi-physics simulation of chloride diffusion in saturated and unsaturated concrete

Zhang

Luzio

Alnaggar

2021

Construction and Building Materials

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Chloride-induced corrosion of steel reinforcement is one of the major long-term deterioration mechanisms for reinforced concrete infrastructures. Chloride transport through cement-based materials is a complex chemo-physical process involving ionic diffusion in concentrated solution, pore structure, chemistry, membrane permeability of the matrix, cracking, and the variation of the internal and external environmental conditions. Although in the literature there are plenty of both simplistic phenomenological models and sophisticated models, in this study, a new model is developed taking aim at capturing the fundamental physics and, at the same time, having a formulation as simple as possible that it can be effectively calibrated and validated using available limited experimental data. The model couples the ionic diffusion process with the concrete micro-structure evolution due to continued hydration accounting for hygro-thermal variations and their effects on both the diffusion and hydration processes. The formulation is implemented in a semi-discrete conduit transport network that mimics the internal heterogeneity of the cementitious material by connecting the matrix space between coarse aggregate pieces. This allows the model to replicate naturally the meso-scale tortuosity effect which is an important feature towards representing realistically the heterogeneity-induced variations of chloride concentration within the concrete. The limited model parameters are carefully calibrated and the formulation is validated by simulating multiple experiments ranging from diffusion through pastes to large concrete cylinders. The results of numerical simulations show the ability of the model to describe spatial and temporal evolution of the chloride concentration within the samples under varying chloride concentrations and temperature boundary conditions within both saturated and 1 unsaturated concrete.

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“…This model has a unique capability in capturing crack distribution and damage in granular quasi-brittle materials. It has been adopted to simulate the mechanical behavior of concrete [59,62], mortar [63,64], fiber reinforced concrete [65,66], or to reproduce multi-physics phenomena such as hygro-thermo-chemical processes, alkali-silica reaction, and aging [63,67,68]. This lattice discrete model was also used to simulate the mechanical behavior of reinforced and unreinforced stone masonry [60,61].…”

Section: The Lattice Discrete Particle Modelmentioning

confidence: 99%

Lattice Discrete Modeling of Out-of-Plane Behavior of Irregular Masonry

Mercuri¹,

Pathirage²,

Gregori³

et al. 2021

Proceedings of the 8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Stone masonry buildings are known to be highly vulnerable to seismic actions. In this context, the analysis of the out-of-plane response of unreinforced masonry structures is crucial. For this purpose, the Lattice Discrete Particle Model (LDPM) was employed to simulate the mechanical behavior of stone masonries up to their failure. Unlike commonly used continuum-based methods or simplified analytical models, that are often limited in modeling correctly complex failure mechanisms, LDPM is able to capture accurately crack distributions and failure patterns. LDPM describes the masonry at the scale of stones and takes into account their interactions through tailored constitutive equations for tensile, compressive, shear, and frictional behaviors. First, LDPM was validated against experimental results on masonry panels subjected to out-of-plane loading. Next, the vertical bending mechanism was studied in the cases of one-and two-story walls with and without openings. Finally, more complex mechanisms were considered where the damage evolution and the fracture propagation were analyzed for a set of panels assumed to be placed within the continuity of a facade. The overall results presented in this paper show that LDPM can realistically predict the collapse mechanisms associated with out-of-plane loading for different structural configurations and geometries.

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Effect of alkali silica reaction on the mechanical properties of aging mortar bars: Experiments and numerical modeling

Cited by 46 publications

References 85 publications

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

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

Coupled multi-physics simulation of chloride diffusion in saturated and unsaturated concrete

Lattice Discrete Modeling of Out-of-Plane Behavior of Irregular Masonry

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