Stress Analysis of Concrete Structures Subjected to Alkali

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Stress Analysis of Concrete Structures Subjected to Alkali ...

behavior of two dams and a reinforced concrete structure is presented. Keywords: alkali-aggregate reaction; dams; stress. INTRODUCTION Many old concrete structures are known to suffer from alkali-aggregate reactions (AAR). This internal reaction causes gel formation inside the aggregate and the matrix and results in swelling of the concrete.

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Stress Analysis of Concrete Structures Subjected to Alkali ...

Stress Analysis of Concrete Structures Subjected to Alkali-Aggregate Reactions. This paper, a follow-up to previous research, examines how a complex and coupled constitutive model for the alkali-aggregate reaction (AAR) in concrete can be used for the long-term (until reaction exhaustion) prediction of an AAR-affected concrete structure.

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Stress Analysis of Concrete Structures Subjected to ...

Mar 01, 1995  Predicting stress levels caused by thermal effects is a main factor in the correct design of structures; both relate to aspects of the maximum stress limitation and the durability of constructions. A numerical procedure based on the finite-element method for the stress-strain analysis of concrete structures exposed to time- and space-variable ...

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Stress Analysis of Concrete Structures Subjected to ...

Mar 01, 1995  Predicting stress levels caused by thermal effects is a main factor in the correct design of structures; both relate to aspects of the maximum stress limitation and the durability of constructions. A numerical procedure based on the finite-element method for the stress-strain analysis of concrete structures exposed to time- and space-variable ...

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FINITE ELEMENT ANALYSIS OF CONCRETE STRUCTURES

V ABSTRACT The alkali-aggregate reaction was first reported in 1940 as a cause of severe cracking in some concrete structures. It is only in recent years that papers have been pub

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Effect of Multiaxial Stresses on Alkali-Silica Reaction ...

structures. While concrete in structures is subjected to various stress states, the mechanism of ASR has been mostly investigated for unrestrained specimens. This study investi-gates the influence of uniaxial, biaxial, and triaxial stresses on the ASR-affected concrete by analyzing triaxial expan-

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Stress Analysis of Concrete Structures Subjected to ...

Mar 01, 1995  Predicting stress levels caused by thermal effects is a main factor in the correct design of structures; both relate to aspects of the maximum stress limitation and the durability of constructions. A numerical procedure based on the finite-element method for the stress-strain analysis of concrete structures exposed to time- and space-variable ...

Get price

Effect of Multiaxial Stresses on Alkali-Silica Reaction ...

structures. While concrete in structures is subjected to various stress states, the mechanism of ASR has been mostly investigated for unrestrained specimens. This study investi-gates the influence of uniaxial, biaxial, and triaxial stresses on the ASR-affected concrete by analyzing triaxial expan-

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INFLUENCE OF CREEP AND STRESS STATES ON ALKALI

The structures affected by Alkali-Silica Reaction (ASR) to be re-assessed are frequently subjected to permanent loads such as dead weight, permanent external loadings or pre-stressing. Stresses make the strain variations within the structures rather complex to be analyzed.

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MATERIAL, STRUCTURAL AND MODELLING ASPECTS OF

multiaxial expansions in concrete structures, such as nuclear concrete structures, that are subjected to stresses or restraints in one or more directions. The materials part of this work is, therefore, focused on the characterization of ASR-affected concrete under multiaxial stresses. Some of the test measurements

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Macroscopic model of concrete subjected to alkali ...

Alkali-Aggregate Reaction (AAR) is a major cause of chemical damage in concrete structures, especially those exposed to moisture, leading to cracking, excessive strains and stress formation.

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Macroscopic model of concrete subjected to alkali ...

Mar 01, 2004  1. Introduction1.1. General aspects of AAR expansion. Structural problems related to alkali–aggregate reaction (AAR) have been detected in concrete structures since the beginning of the 20th century, but it was not before 1940 that it was first identified by Stanton .Since then, many efforts have been made to minimize its deleterious effects on concrete.

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NONLINEAR ANALYSIS OF CONCRETE STRUCTURESt

finite element analysis of concrete structures can be very costly and may require considerable user exper- ... model behavior when it is subjected to various stress-strain paths. Finally, in Part II of tbe paper we ... present the results of the analyses of the Sandia pressure vessel, an alkali-silica reacted beam and a PWR prestressed concrete ...

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Macroscopic model of concrete subjected to alkali ...

The structural behaviour of concrete affected by alkali-aggregate reaction (AAR) is difficult to model due to the amount of random parameters that govern this chemical process. The aim of this work is to present a macroscopic approach whose main features are the consideration of uncoupling between AAR and stress and the representation of the anisotropic characteristic of chemical swelling.

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FINITE ELEMENT ANALYSIS OF WALLS WITH ALKALI-SILICA ...

Reinforced Concrete, Alkali Silica Reaction (ASR), Cyclic Loading, Shear Capacity, FEA . 1. INTRODUCTION. The research program on assessment of structures subjected to concrete pathologies (ASCET) was organized by the OECD/NEA. The objective of this research program is to make general recommendations for aging

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Characterization of concrete materials by using stress ...

Dec 02, 1999  Abstract. A new instrument for monitoring the quality of concrete materials has been developed by Andec Mfg. Ltd. This new instrument, the AndeScope, can be used to evaluate concrete materials by measuring the stress wave velocity, dynamic elastic constant, quality factor (Q-factor), signal frequency, and decay coefficient.

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Victor E. Saouma Alkali-Aggregate Reactions

Hariri-Ardebili, M., and Saouma, V. (2018) Sensitivity and uncertainty analysis of AAR affected reinforced concrete shear walls Engineering Structures, Vol. 172, pp. 334-345; Liaudata, J. and Carol, I. and Lopez, C. and Saouma, V. (2018) ASR Expansions in Concrete under Triaxial Confinement Cement and Concrete Composites, Feb., pp 160-170

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Mechanical behavior of geopolymer concrete subjected to ...

Jan 23, 2015  Geopolymers, as ceramic materials, are produced by alkali activation of aluminosilicate raw materials (fly ash or metakaolin), which are transformed into a reaction product by polymerization in a high pH environment and hydrothermal conditions at relatively low temperatures (up to 120 °C) [1, 2].As fly ash is an by-product from power stations, the use of fly ash to make concrete can ...

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Saouma, Victor CU Experts CU Boulder

Stress, analysis of concrete structures subjected to alkali-aggregate, reactions. ACI Structural Journal. 532-541. 2007; Fracture mechanics based model for joints under cyclic loading. Journal of Engineering Mechanics. 1151-1159. 2006

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Active Confinement Subjected to Monotonic and Cyclic Axial ...

analysis and design of GPC structures require a reliable and accurate material model of GPC, which can only be obtained by conducting multi-axial experiments on structural GPC. On the other hand, due to the inherent brittleness of GPC and the high demand for ductility of GPC structures subjected

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INFLUENCE OF CREEP AND STRESS STATES ON ALKALI

The structures affected by Alkali-Silica Reaction (ASR) to be re-assessed are frequently subjected to permanent loads such as dead weight, permanent external loadings or pre-stressing. Stresses make the strain variations within the structures rather complex to be analyzed.

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Influence of stress restraint on the expansive behaviour ...

Sep 15, 2010  OSTI.GOV Journal Article: Influence of stress restraint on the expansive behaviour of concrete affected by alkali-silica reaction

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MODELLING OF ALKALI-AGGREGATE REACTION IN

concrete subjected to AAR, including effects of the reinforcement presence, the 3D stress state and humidity. A real case study will be presented, showing a set composed by column, pile caps and piles of a building foundation structure that suffered the effect of AAR.

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STRESS ANALYSIS OF CONCRETE STRUCTURES SUBJECTED TO ...

STRESS ANALYSIS OF CONCRETE STRUCTURES SUBJECTED TO VARIABLE THERMAL LOADS. A primary factor in the correct design of structures is predicting stress levels caused by thermal effects--both of which relate to aspects of the maximum stress limitation and the durability of construction.

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The Effect Of Multiaxial Stresses On The Alkali-Silica ...

Jul 12, 2017  The Effect Of Multiaxial Stresses On The Alkali-Silica Reaction (ASR) Damage Of Concrete ... expansions in concrete structures that are subjected to

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Macroscopic model of concrete subjected to alkali ...

The structural behaviour of concrete affected by alkali-aggregate reaction (AAR) is difficult to model due to the amount of random parameters that govern this chemical process. The aim of this work is to present a macroscopic approach whose main features are the consideration of uncoupling between AAR and stress and the representation of the anisotropic characteristic of chemical swelling.

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Concrete Expansion Induced by Alkali–Silica Reaction in a ...

Jan 03, 2017  Alkali–aggregate reaction in concrete structures consists of a chemically deleterious reaction between alkalis liberated during the cement hydration and reactive minerals present in the aggregates like silica, silicate or carbonate. The process leads to the formation of a gel, which expands in the presence of hydroxyl ions, causing cracks and volumetric variation in the concrete.

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FINITE ELEMENT ANALYSIS OF WALLS WITH ALKALI-SILICA ...

Reinforced Concrete, Alkali Silica Reaction (ASR), Cyclic Loading, Shear Capacity, FEA . 1. INTRODUCTION. The research program on assessment of structures subjected to concrete pathologies (ASCET) was organized by the OECD/NEA. The objective of this research program is to make general recommendations for aging

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Material, structural and modelling aspects of alkali ...

Material, structural and modelling aspects of alkali aggregate reaction in concrete . 10 0 0 0 0

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Alkali-Silica Reaction-Affected Reinforced Concrete ...

Jan 05, 2021  Contradicting experimental results were reported in the literature concerning the effects of alkali-silica reaction (ASR) on the structural performance of shear-critical reinforced concrete elements, whether they have come from full-scale tests on specimens extracted from existing ASR-affected structures or from laboratory specimens conditioned to accelerate the rate of the reaction.

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Effect of Multiaxial Stresses on Alkali ... - concrete

Jul 01, 2017  This paper investigates the influence of sustained multiaxial stresses on the response of concrete undergoing ASR. Reactive concrete cube specimens (with three replicates) were subjected to different stress states, from no-stress to triaxial stress, and were subjected to accelerated curing until the exhaustion of expansion potential.

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Alkali Aggregate Reaction in Nuclear Concrete Structures ...

To simulate the ASR effects on the structural behaviour of reinforced concrete elements, two mechanisms are considered in VecTor2: induced expansion, and ... Alkali Aggregate Reaction in Nuclear Concrete Structures: Part 4: Modelling and Analysis ...

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International Journal of Concrete Structures and Materials ...

Aug 04, 2021  Authors: Asghar Aryanfar, Irem Şanal and Jaime Marian. Citation: International Journal of Concrete Structures and Materials 2021 15 :25. Content type: Research. Published on: 5 May 2021. The Correction to this article has been published in International Journal of Concrete Structures and Materials 2021 15 :29. View.

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Computational Modelling of Concrete Structures ...

Feb 07, 2018  Analysis of reinforced concrete structures. Modelling of the proof load test on viaduct De Beek E.O.L. Lantsoght, A. de Boer, C. van der Veen D.A. Hordijk. Organizing an international blind prediction contest for improving a guideline for the nonlinear finite elements analysis of concrete structures

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