Crack healing of cementitious materials using shrinkable polymer tendons

Isaacs, Ben; Lark, Robert John; Jefferson, Tony; Dunn, Scott

doi:10.1002/suco.201200013

Cited by 26 publications

(13 citation statements)

References 18 publications

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“…At Cardiff University, they examined the feasibility of low-level post-tensioned cementitious materials using shrinkable polymer tendons [44,45,46,47,48]. In this case, cracked specimens were heated in an oven resulting in shrinkage of the embedded poly ethylene terephthalate (PET) tendons followed by crack closure.…”

Section: Approaches To Self-healingmentioning

confidence: 99%

Self-Healing in Cementitious Materials—A Review

2013

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Concrete is very sensitive to crack formation. As wide cracks endanger the durability, repair may be required. However, these repair works raise the life-cycle cost of concrete as they are labor intensive and because the structure becomes in disuse during repair. In 1994, C. Dry was the first who proposed the intentional introduction of self-healing properties in concrete. In the following years, several researchers started to investigate this topic. The goal of this review is to provide an in-depth comparison of the different self-healing approaches which are available today. Among these approaches, some are aimed at improving the natural mechanism of autogenous crack healing, while others are aimed at modifying concrete by embedding capsules with suitable healing agents so that cracks heal in a completely autonomous way after they appear. In this review, special attention is paid to the types of healing agents and capsules used. In addition, the various methodologies have been evaluated based on the trigger mechanism used and attention has been paid to the properties regained due to self-healing.

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Section: Approaches To Self-healingmentioning

confidence: 99%

Self-Healing in Cementitious Materials—A Review

2013

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“…The set of experimental results presented above have good implications for the use of this material in the proposed LatConX system as they show very limited stress relaxation. This is beneficial for two reasons: first, it means that an adequate stress will be applied to the cracked faces of the cementitious material for an extended period of time giving continuous aid to autogenous healing of the crack, and second, the polymer tendons can be considered to act as an effective long‐term prestressing system improving the performance of the cementitious structure.…”

Section: Methodsmentioning

confidence: 99%

Long‐term stress relaxation behavior of predrawn poly(ethylene terephthalate)

Hazelwood

Jefferson

Lark

et al. 2014

J of Applied Polymer Sci

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Research has been carried out with the aim of better understanding the relevant properties of materials to be used in a new self‐healing cementitious composite material system. In a previous study, the buildup of stress in a heat‐activated restrained predrawn poly(ethylene terephthalate) (PET) specimen was investigated. In the current study, the long‐term stress relaxation behavior of such a restrained specimen has been explored so that its potential for use in the new material system can be better understood. The work includes an experimental study in which the stress in a number of PET specimens, restrained against longitudinal shrinkage, was measured during the initial heat activation and cooling phases, and then monitored for a further 6 months. These data were used to quantify the stress relaxation of the specimen and to inform the development of a new one‐dimensional numerical model to simulate the thermomechanical behavior of this material. This model is shown to be able to reproduce the observed short‐ and long‐term experimental behavior with good accuracy. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41208.

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“…Shape memory alloy (SMA) bars have been shown to be effective at closing cracks in RC structures, although the cost of SMAs makes such a system unviable for all but the most specialist applications. A group at Cardiff has shown the potential of using Shape Memory Polymer (SMP) tendons to close cracks and enhance autogenous healing …”

Section: Overview Of Existing Self‐healing Technologies and Mechanismsmentioning

confidence: 99%

Research Progress on Numerical Models for Self‐Healing Cementitious Materials

Jefferson

Javierre

Freeman

et al. 2018

Adv Materials Inter

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In this paper, research progress on numerical models for self‐healing cementitious materials (SHCMs) is discussed. Models developed specifically for SHCMs, as well as other relevant work, are considered. A summary of current self‐healing (SH) techniques is provided along with descriptions of the processes that govern their behavior. Models for mechanical self‐healing, transport processes in materials with embedded healing systems, fully coupled models, and other modeling techniques used to simulate SH behavior are discussed. The mechanics models discussed include those based on continuum–damage–healing mechanics (CDHM), micromechanics, as well as models that use discrete elements and particle methods. A considerable section is devoted to the simulation of carbonation in concrete since the essential mechanisms that govern this process are applicable to SH systems that employ calcite as a healing material. A number of transport models for simulating early‐age self‐healing are also considered. This highlights the fact that there are currently very few papers that describe fully coupled models, although a number of approaches that couple some aspects of transport and mechanical healing behavior are discussed. This article closes with a discussion that highlights the fact that many models are presented with limited or no experimental validation.

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Crack healing of cementitious materials using shrinkable polymer tendons

Abstract: This paper presents an experimental study on autogenous healing in a recently

Cited by 26 publications

References 18 publications

Self-Healing in Cementitious Materials—A Review

Self-Healing in Cementitious Materials—A Review

Long‐term stress relaxation behavior of predrawn poly(ethylene terephthalate)

Research Progress on Numerical Models for Self‐Healing Cementitious Materials

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