Structural Performance of Nuclear Power Plant Concrete Structures Affected by Alkali-Silica Reaction (ASR) Task 2: Assessing Bond and Anchorage of Reinforcing Bars in ASR-Affected Concrete

Thonstad, Travis; Weigand, Jonathan M.; Sadek, Fahim; Marcu, Sorin; Barrett, Timothy J.; Lew, Hai S.; Phan, Long T.; Pintar, Adam L.

doi:10.6028/nist.tn.2127

2021

DOI: 10.6028/nist.tn.2127

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Structural Performance of Nuclear Power Plant Concrete Structures Affected by Alkali-Silica Reaction (ASR) Task 2: Assessing Bond and Anchorage of Reinforcing Bars in ASR-Affected Concrete

Travis Thonstad¹,

Jonathan M. Weigand²,

Fahim Sadek³

et al.

Abstract: The policy of NIST is to use the International System of Units in all publications. In this document, however, units are presented in the system prevalent in the relevant discipline, although in some cases more than one system of units may be presented. Use in Legal ProceedingsNo part of any report resulting from a NIST investigation into a structural failure or from an investigation under the National Construction Safety Team Act may be used in any suit or action for damages arising out of any matter mentione… Show more

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Cited by 2 publications

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Finite element simulation of expansion and damage in RC elements affected by alkali‐aggregate reactions

Teymouri,

Yousefpour,

Navayi Neya

2023

Structural Concrete

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Alkali‐aggregate reaction (AAR) is a detrimental reaction between alkalis originating from cement and aggregates that contain reactive minerals. This reaction produces an expansive gel in hardened concrete that may cause internal stresses and cracking, after which it would be critical to evaluate the safety of the AAR‐affected structure. This paper presents a calculation framework primarily using the finite element method to simulate the structural behavior of reinforced concrete members affected by AAR. Numerical subroutines are used to calculate the anisotropic distribution of AAR‐induced expansions at each integration point, considering the stress field at each time step, whereas changes in the properties of concrete due to the progression of AAR are also considered. The modeling approach is successfully validated based on experimental data from several studies on AAR‐affected members that were reinforced in 1, 2, and 3 orthogonal directions in terms of load–deflection behavior and damage patterns. The mechanical properties of concrete were found to negligibly affect the distribution of AAR expansions. A better correlation was observed with experimental data if compressive and tensile strengths of concrete are assumed unchanged and only the modulus of elasticity of concrete is reduced as a function of AAR‐induced expansion.

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Finite element simulation of expansion and damage in RC elements affected by alkali‐aggregate reactions

Teymouri,

Yousefpour,

Navayi Neya

2023

Structural Concrete

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Effect of alkali silica reaction on pretensioned concrete bridge girders

Aligolnia,

Yousefpour

2024

Structural Concrete

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Alkali silica reaction (ASR) is an undesirable phenomenon that occurs between alkalis that usually originate from cement and certain types of siliceous aggregates in concrete. The result of this reaction is delayed expansion of hardened concrete in the presence of moisture, which may cause cracking and damage in an existing structure. The present paper investigates the general behavior and shear strength of pretensioned concrete bridge girders affected by ASR. Four identical pretensioned concrete AASHTO Type I girders were fabricated using reactive concrete and subjected to environmental conditioning at a relative humidity of 100% and a temperature of 45 degrees Celsius for up to 296 days to accelerate the development of ASR. During this period, ASR‐induced expansions, changes in surface strains of concrete, transfer lengths, and patterns of damage and cracking were monitored. Each specimen was subjected to shear‐critical loading until failure upon reaching the desired expansion level. The results showed that the existence of prestressing force played a significant role in limiting the ASR‐induced in‐plane expansion and cracking. Progress of ASR caused a reduction in the load corresponding to the first detected flexural crack but an increase by up to 14% in the load corresponding to the first diagonal cracking compared to the control specimen, likely due to the additional prestress caused by restrained ASR‐induced expansions. The ultimate shear strength of ASR‐affected girders was generally within 5% of the control specimens, and all specimens exceeded their nominal shear strengths according to AASHTO LRFD 2020 specifications. Until the unrestrained uniaxial expansion of 0.2%, no significant concerns were identified regarding the shear strength of the ASR‐affected pretensioned concrete specimens.

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Structural Performance of Nuclear Power Plant Concrete Structures Affected by Alkali-Silica Reaction (ASR) Task 2: Assessing Bond and Anchorage of Reinforcing Bars in ASR-Affected Concrete

Cited by 2 publications

References 17 publications

Finite element simulation of expansion and damage in RC elements affected by alkali‐aggregate reactions

Finite element simulation of expansion and damage in RC elements affected by alkali‐aggregate reactions

Effect of alkali silica reaction on pretensioned concrete bridge girders

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