Stress Analysis of Concrete Structures Subjected to Alkali
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Stress Analysis of Concrete Structures Subjected to Alkali .

Stress Analysis of Concrete Structures Subjected to Alkali ...

2019-2-2  Stress Analysis of Concrete Structures Subjected to Alkali-Aggregate Reactions by Victor Saouma, Luigi Perotti, and Takashi Shimpo ACI Structural Journal/September-October 2007533 various parameters; and 4) present three case studies investigated with the model.

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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 ...

1995-3-1  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

2020-8-28  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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Multiaxial Expansion-Stress Relationship for Alkali Silica ...

2017-6-3  Expansion due to alkali-silica reaction (ASR) has caused serious consequences in many concrete structures around the world.1ASR is a complicated reaction that is influenced by several factors such as temperature, humidity, alkali content of concrete, type and content of reactive aggregate, and stress

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Macroscopic model of concrete subjected to alkali ...

2004-3-1  According to Ulm et al.'s model, concrete is considered as a porous medium comprising a solid matrix skeleton with gel occupying the voids, giving way to the concept of total stress (σ) acting on a unit volume of concrete and gel, effective stress (σ μ) acting on the solid matrix and pore pressure (p g) in the gel.The analogue for AAR gel and concrete behaviour is twofold: one models gel ...

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

2017-8-4  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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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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Stochastic analysis of concrete dams with alkali aggregate ...

2020-6-1  Dams are the quintessential examples of concrete structures with random heterogeneous properties as large volume of concrete is cast in layers bordered by vertical expansion joints laterally, and lift joint horizontally [], Fig. 4.Whereas there can be adequate quality control for the cement and the mixing process, randomness is infused through the use of various aggregate sources, the mixing ...

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Interpretation of expansion curves of concrete subjected ...

The examination of several long-term expansion results for concretes subjected to accelerated alkali–aggregate reaction (AAR) tests shows that, in some cases, the expansion continues for a long ...

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On the mechanical behaviour of concrete subjected to ...

1996-3-17  INTRODUCTION Over the last few decades an increasing number of concrete structures have shown evidence of durability problems due to alkali-aggregate reaction (AAR). At the present time, the situation is quite alarming as there is virtually no country which could claim immu- nity from AAR-induced concrete deterioration.

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ALKALI AGGREGATE REACTION IN NUCLEAR CONCRETE

2017-6-9  ALKALI AGGREGATE REACTION IN NUCLEAR CONCRETE STRUCTURES: PART 2: CONCRETE MATERIALS ASPECTS B.P. Gautam 1, ... ASR in concrete subjected to multiaxial stress states. The scope of this paper includes the study of triaxial ... ASR involves reactions between alkali pore solution in the concrete and certain forms of alkali-reactive silica. In the ...

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MACROSCOPIC MODEL OF CONCRETE SUBJECTED TO ALKALI ...

The structural behavior of concrete affected by alkali-aggregate reaction (AAR) is difficult to model because of the amount of random parameters that govern this chemical process. The objective of this paper is to present a macroscopic approach whose main features are the consideration of uncoupling between AAR and stress and the representation ...

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INFLUENCE OF CREEP AND STRESS STATES ON ALKALI

2020-11-6  INFLUENCE OF CREEP AND STRESS STATES ON ALKALI-SILICA REACTION INDUCED-EXPANSION OF CONCRETE UNDER RESTRAINT Yuichiro Kawabata 1, 2, Jean-François Seignol1, Renaud-Pierre Martin1, François Toutlemonde , 1 Université Paris -Est, IFSTTAR , Materials and Structures Department, Marne la Vallée FRANCE 2 Port and Airport Research Institute ,

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FINITE ELEMENT ANALYSIS OF WALLS WITH

2020-5-30  Concrete swelling (volume change) is a consequence of several degradation mechanisms of concrete structures (alkali aggregate reaction, delayed ettringite formation, irradiated concrete, etc.) and it is important to assess and quantify the ultimate and service limit states of structures

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Interpretation of expansion curves of concrete subjected ...

The examination of several long-term expansion results for concretes subjected to accelerated alkali–aggregate reaction (AAR) tests shows that, in some cases, the expansion continues for a long ...

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

2017-7-13  To understand the effect of multiaxial stresses on ASR-affected concrete, research was conducted at the University of Toronto that involved an experimental investigation of more than 20 concrete ...

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Effect of Alkali-Silica Reactivity Damage to Tip-Over ...

2018-3-22  Keywords: impact analysis, alkali-silica reaction, dry cask storage structures, concrete degradation, failure analysis. 1. Introduction Degradation of concrete limits the service life of struc-tures. Creep and shrinkage due to moisture transfer in the early age of concrete

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“ANALYSIS OF POLYESTER FIBRE REINFORCED CONCRETE

2016-6-10  Analysis of Polyester Fibre Reinforced Concrete Subjected to Elevated Temperatures 3 civil structures. There are many ways to minimize the failure of the concrete structures made of steel reinforce concrete.

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State of Strength in Massive Concrete Structure Subjected ...

2015-2-28  Abstract The paper deals with an impact of non–mechanical loads on the state of strength in massive concrete hydraulic structures. An example of hydroelectric plant subjected to the effect of water temperature annual fluctuation is considered. Numerical analysis of transient thermal–elasticity problem was performed. After determining the temperature distributions within the domain, the ...

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MODELLING OF ALKALI-AGGREGATE REACTION IN

2020-11-6  MODELLING OF ALKALI-AGGREGATE REACTION IN CONCRETE PILE CAPS STRUCTURES Marco Juliani1*, Lucas Juliani1, Tiago Juliani1, Daniela David1, ... subjected to normal stress test to determine the compressive strength and modulus of elasticity. The ... analysis were given by means of orthogonal stresses and accrued deformations.

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ALKALI AGGREGATE REACTION IN NUCLEAR CONCRETE

2017-6-9  ALKALI AGGREGATE REACTION IN NUCLEAR CONCRETE STRUCTURES: PART 2: CONCRETE MATERIALS ASPECTS B.P. Gautam 1, ... ASR in concrete subjected to multiaxial stress states. The scope of this paper includes the study of triaxial ... ASR involves reactions between alkali pore solution in the concrete and certain forms of alkali-reactive silica. In the ...

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

2017-7-13  To understand the effect of multiaxial stresses on ASR-affected concrete, research was conducted at the University of Toronto that involved an experimental investigation of more than 20 concrete ...

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Alkali Slica Reaction in Concrete - VicRoads

2016-12-29  ASR affected structures should be inspected on a regular basis by experienced personnel. Monitoring of cracks should be undertaken using suitable measuring devices. Concrete cores are extracted from structures and subjected to petrographic analysis by viewing thin sections with a petrographic microscope. Alternatively, a more detailed

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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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Effect of Alkali-Silica Reaction on Shear Strength of ...

2015-10-1  Alkali-Silica Reaction (ASR) is a reaction that occurs over time in concrete between alkaline cement paste and reactive, non-crystalline silica (aggregates). In the presence of water, an expansive gel is formed within the aggregates, which results in micro cracks in aggregates and adjacent cement paste.

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Mechanical behavior of geopolymer concrete subjected to ...

2015-1-23  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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NONLINEAR ANALYSIS OF CONCRETE STRUCTURESt

2010-9-13  stress, and in addition the nonlinearities introduced by reinforcing and prestressing steel should in general be taken into account [l13]. There are a number of factors that have prevented the wider acceptability of nonlinear finite element analysis procedures in the analysis of concrete struc- tures.

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Durability and degradation mechanisms of GFRP ...

2019-3-25  14 exposed to severe environments and subjected to different levels of sustained load. The test environments 15 included moist concrete, alkaline solution and tap water, with temperatures varying from 20°C to 60°C. The 16 mechanical properties of the bars were characterized through direct tension, flexural and inter-laminar shear

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[PDF] Behaviour of Reinforced Concrete Slab Subjected To ...

The behavior of reinforced concrete slab exposed to fire is presented. Two stages of analysis is carried out using Fin ite Element package ABAQUS to find thermal response of structural members namely thermal analysis and structural analysis. In the first step, the distribution of the temperature over the depth during fire is dete rmined. In the next step, the mechanical analysis is made in ...

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