A new system for crack closure of cementitious materials using shrinkable polymers

Jefferson, Tony; Joseph, Craig; Lark, Robert John; Isaacs, Ben; Dunn, Scott; Weager, Brendon

doi:10.1016/j.cemconres.2010.01.004

Cited by 88 publications

(68 citation statements)

References 9 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: 74%

“…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%

See 2 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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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: 74%

Section: Temperature-shrinkage Profiles In Ts2 Specimensmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Teall

Pilegis

Sweeney

et al. 2017

Smart Mater. Struct.

Self Cite

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“…Indeed the glass tubing approach may be considered a variant of chemical encapsulation as an alternative form of healing agent delivery approach, with the advantage of potentially carrying a larger amount of healing agent compared with microcapsules. Various chemicals including methyl methacrylate (Dry and McMillan 1996), ethyl cyanoacrylate Joseph et al 2010) and polyurethane combined with an accelerator (van Tittelboom et al 2011) have demonstrated the ability of recovering concrete mechanical and transport properties. These chemicals are chosen to have low viscosity so that the healing agents can leak from the fractured glass tube into the concrete crack to perform the self-healing.…”

Section: Self-healing Approachesmentioning

confidence: 99%

“…As noted above, the healing agent is not limited to chemicals, but could be biological (Wang et al 2012). Evidence of self-healing was based on mechanical reloading of beam elements that show a rebound of stiffness and/or strength Joseph et al 2010;Van Tittelboom et al 2011) and a reduction of permeability coefficient (Van Tittelboom et al 2011).…”

Section: Self-healing Approachesmentioning

confidence: 99%

Advances in Self-healing Cementitious Materials

2012

ACT

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PrefaceThis special issue is aiming at summarizing recent progress in self-healing cementitious materials and at motivating further development in the relevant research. It took a long time since the efforts to develop self-healing materials working as intelligent materials drew strong attention worldwide in the research communities. Research and development of self-healing performance have been progressing on varieties of materials including metals, non-metals, inorganic and organic materials, and composite materials. Particularly for cement-based materials, based on the background of epoch-making ideas and existing research results, it has become possible to introduce some self-healing functions and their combined mechanisms. These self-healing cementitious materials have potentials to renovate existing structural designs and maintaining schemes and contribute to service life extension and environmental impact reduction. We expect this special issue could support to realize the potential.This special issue was worked out under a strong support of JCI Technical Committee on Self-healing / Repairing Technology in Cement-based Materials (JCI TC-091) chaired by Prof. S. Igarashi, Kanazawa University. This committee's activities included 1) quantitative evaluation of self-healing performance such as water leakage control and loading damage recovery, 2) investigation into self-healing mechanism, and 3) application of non-destructive test to identify self-healing results. Committee members of the TC are listed below.Koichi Maekawa, Editor-in-Chief of ACT TC-091 committee members AbstractReinforced concrete (RC) structures in marine environments are generally affected by harsh marine environmental actions, resulting in early performance degradation mainly due to chloride-induced deterioration. In such conditions, corrosion of rebar progresses rapidly, and also the cross-sectional area of rebar is reduced and consequently structural performance of RC structures will be degraded. In contrast, the surface of concrete structures is often covered with many marine sessile organisms under marine tidal and submerged conditions. These marine sessile organisms have been empirically known to enhance the durability of concrete though the effectiveness is not appropriately evaluated. This paper describes the long-term resistance of concrete with marine sessile organisms to chloride ion penetration in concrete. The effect and its sustainability of marine sessile organisms on chloride ion penetration in concrete were investigated through field exposure tests and laboratory tests. From the test results, the basal membrane, which is a matrix of marine sessile organisms, adheres to concrete strongly on a long-term basis though some gaps between concrete and the basal membrane can be observed. In addition, experimental results and simplified simulation clarified that the attachment of marine sessile organisms can enhance the long-term resistance of concrete to chloride ion penetration.

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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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A new system for crack closure of cementitious materials using shrinkable polymers

Cited by 88 publications

References 9 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

Advances in Self-healing Cementitious Materials

Research Progress on Numerical Models for Self‐Healing Cementitious Materials

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