Shrinkage behavior of poly(ethylene terephthalate) for a new cementitious–shrinkable polymer material system

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

doi:10.1002/app.33109

Cited by 12 publications

(28 citation statements)

References 19 publications

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“…The restrained shrinkage stresses achieved in a series of drawn PET filament specimens, manufactured at Bradford University, were significantly larger than those obtained from the commercially available PET strips used in previous experiments. 10,11,18 The shrinkage stress measured was also higher than that produced by PET tube and tube with filament samples subjected to similar die-draw processing. This is attributed to a higher draw rate resulting in a greater amount of stored energy within the filament samples.…”

Section: Discussionmentioning

confidence: 77%

“…10 This variation may be due to manufacturing process changes since the original tests were undertaken and is discussed in more detail in section 3.5.…”

Section: Peak Shrinkage Stress In Ts1 Samplesmentioning

confidence: 99%

“…Thereafter, the stress starts to fall as the temperature increases further, which is consistent with the findings from previous tests on similar materials. 10,11 The solid filament and filament tube samples exhibited stress peaks of 41.8 MPa and 42.9…”

Section: Temperature-shrinkage Profiles In Ts2 Specimensmentioning

confidence: 99%

“…10,11 A number of other investigators have explored the use of shape memory materials for closing, or preventing, cracks in a range of other materials. [12][13][14][15][16][17] The particular interest of the current work is large structural concrete applications, for which higher shrinkage stresses than those previously observed are required for the crack closure system to be viable.…”

Section: Introductionmentioning

confidence: 99%

“…The shrinkage stress value sought is of the order of 100MPa but lower values, in the range 30-50MPa, would allow the system to close early age cracks and enhance autogenous healing mechanisms. 18,19 Smart Materials and Structures 2017 This paper describes some new restrained shrinkage stress experiments on a set of manufactured drawn PET samples of varying cross-section, which were undertaken with the aim of finding a higher shrinkage stress solution for use within the concrete crack closure system.…”

Section: Introductionmentioning

confidence: 99%

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Development of high shrinkage polyethylene terephthalate (PET) shape memory polymer tendons for concrete crack closure

Teall

Pilegis

Sweeney

et al. 2017

Smart Mater. Struct.

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The shrinkage force exerted by restrained shape memory polymers can potentially be used to close cracks in structural concrete. This paper describes the physical processing and experimental work undertaken to develop high shrinkage die-drawn Polyethylene Terephthalate (PET) shape memory polymer tendons for use within a crack closure system. The extrusion and die-drawing procedure used to manufacture a series of PET tendon samples is described. The results from a set of restrained shrinkage tests, undertaken at differing activation temperatures, are also presented along with the mechanical properties of the most promising samples.The stress developed within the tendons is found to be related to the activation temperature, the cross-sectional area and to the draw rate used during manufacture. Comparisons with commercially-available PET strip samples used in previous research are made, demonstrating an increase in restrained shrinkage stress by a factor of two for manufactured PET filament samples.

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Section: Discussionmentioning

confidence: 77%

“…10 This variation may be due to manufacturing process changes since the original tests were undertaken and is discussed in more detail in section 3.5.…”

Section: Peak Shrinkage Stress In Ts1 Samplesmentioning

confidence: 99%

Section: Temperature-shrinkage Profiles In Ts2 Specimensmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Development of high shrinkage polyethylene terephthalate (PET) shape memory polymer tendons for concrete crack closure

Teall

Pilegis

Sweeney

et al. 2017

Smart Mater. Struct.

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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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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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Shrinkage behavior of poly(ethylene terephthalate) for a new cementitious–shrinkable polymer material system

Cited by 12 publications

References 19 publications

Development of high shrinkage polyethylene terephthalate (PET) shape memory polymer tendons for concrete crack closure

Development of high shrinkage polyethylene terephthalate (PET) shape memory polymer tendons for concrete crack closure

Research Progress on Numerical Models for Self‐Healing Cementitious Materials

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

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