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2023 | Book

Concrete Structures Deteriorated by Delayed Ettringite Formation and Alkali-Silica Reactions

Authors: António C. Azevedo, Fernando A.N. Silva, João M.P.Q. Delgado, Isaque Lira

Publisher: Springer International Publishing

Book Series : Building Pathology and Rehabilitation

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About this book

This book discusses the behaviour of isolated concrete bottle-shaped struts affected by internal expansion reactions (ISR). For that purpose, the numerical modelling of damaged concrete was performed using the Concrete Damaged Plasticity Model (CDPM) implemented in ABAQUS and validated the model through Sankovich's tests. A procedure to automatically obtain the concrete plasticity and damage parameters, essential for CDPM, was developed in Matlab. The inputs were the characteristic compressive strength of the concrete, the equivalent length of the finite element mesh and the ratio between the plastic and inelastic compressive strains. The results showed that the CDPM could represent the load-bearing mechanisms of isolated concrete bottle-shaped struts for a range of several stress levels to which these elements may be subjected in the panels investigated. The numerical simulations for different expansion levels consistently captured the expected damage profile of the panels and the load corresponding to the formation of the first crack, the estimated crack opening, and the ultimate load. For the panels investigated, the reduction observed in the failure load reached values close to 70%, the increase of the tensile plastic deformation was more than 60%, and the maximum crack opening can reach an increase of 113% when compared with those observed experimentally in panels without internal swelling reactions The book also offers a systematic review of the current state of knowledge and it is a valuable resource for scientists, students, practitioners, and lecturers in various scientific and engineering disciplines, namely, civil and materials engineering, as well as and other interested parties.

Table of Contents

Frontmatter
Chapter 1. Introduction
Abstract
Concrete structures can be divided into regions in which the hypotheses of the theory of bending and linear distribution of deformations are applicable and others, in the vicinity of sudden changes in geometry or loading, where the distribution of deformations is no longer linear. These regions are often referred to as Regions-B and D-regions, respectively—the letter B comes from Bernoulli and the letter D comes from Discontinuity.
António C. Azevedo, Fernando A. N. Silva, João M. P. Q. Delgado, Isaque Lira
Chapter 2. Brief Literature Review
Abstract
In recent years, researches works have reported with relative frequency the occurrence of DEF expansions in the most varied concrete constructions, such as: bridges.
António C. Azevedo, Fernando A.N. Silva, João M.P.Q. Delgado, Isaque Lira
Chapter 3. The Plasticity Model of Concrete Damage—CDPM
Abstract
Numerical simulation of the behaviour of concrete structures is not a task of simple understanding and implementation. Various phenomena related to the rheology of the material itself associated with the interaction of concrete with steel (reinforced concrete) contribute to lend a particular complexity that are not frequent in other construction materials.
António C. Azevedo, Fernando A. N. Silva, João M. P. Q. Delgado, Isaque Lira
Chapter 4. Bottle-Shaped Isolated Struts Concrete Deteriorated
Abstract
Sankovich’s research analysed the behaviour of bottle-shaped connecting rods using simple and reinforced concrete panels with various transverse reinforcement configurations, in which the compressive stresses resulting from the load applied through rigid plates installed at the top and base of the elements were able to disperse creating transverse tensile stresses within the samples.
António C. Azevedo, Fernando A.N. Silva, João M.P.Q. Delgado, Isaque Lira
Chapter 5. Numerical Simulation
Abstract
The first step to modelling in ABAQUS software is the creation of the distinct parts that make up the model,—Module Parts.
António C. Azevedo, Fernando A.N. Silva, João M.P.Q. Delgado, Isaque Lira
Chapter 6. Numerical Results and Discussion
Abstract
The following qualitative and quantitative comparisons are made between the numerical models developed and the experimental results presented in Chap. 4.
António C. Azevedo, Fernando A.N. Silva, João M.P.Q. Delgado, Isaque Lira
Chapter 7. Conclusions and Future Recommendations
Abstract
The objective of this work was to understand the structural behaviour of isolated bottle-shaped struts deteriorated by internal expansion reactions through numerical modelling with the FEM model. In general, the results obtained showed that the CDPM is a model of plasticity with damage with the potential to represent the load-bearing mechanisms of isolated concrete bottle-shaped struts a range of several stress levels to which these elements may be subjected in the panels investigated.
António C. Azevedo, Fernando A. N. Silva, João M. P. Q. Delgado, Isaque Lira
Metadata
Title
Concrete Structures Deteriorated by Delayed Ettringite Formation and Alkali-Silica Reactions
Authors
António C. Azevedo
Fernando A.N. Silva
João M.P.Q. Delgado
Isaque Lira
Copyright Year
2023
Electronic ISBN
978-3-031-12267-5
Print ISBN
978-3-031-12266-8
DOI
https://doi.org/10.1007/978-3-031-12267-5