A shape memory polymer concrete crack closure system activated by electrical current

Teall, Oliver; Pilegis, Martins; Davies, Robert; Sweeney, J.; Jefferson, Tony; Lark, Robert John; Gardner, Diane Ruth

doi:10.1088/1361-665x/aac28a

Cited by 45 publications

(32 citation statements)

References 12 publications

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“…[16][17][18] In essence, shape recovery of electroactive SMP is stimulated by the heat generated from electricity. [19] When certain voltage is applied to electroactive SMP, the electrical energy is converted into thermal energy due to Joule heating effect and makes the temperature exceeding its shape transition temperature to activate shape recovery. [20] Accordingly, electroactive is more apt to be fulfilled in SMPs with low shape transition temperatures.…”

Section: Doi: 101002/macp201900164mentioning

confidence: 99%

“…Electroactive SMPs have been explored extensively since electricity is a very convenient stimulus for SMPs, especially in applications where direct heat is inconvenient or difficult to be executed . In essence, shape recovery of electroactive SMP is stimulated by the heat generated from electricity . When certain voltage is applied to electroactive SMP, the electrical energy is converted into thermal energy due to Joule heating effect and makes the temperature exceeding its shape transition temperature to activate shape recovery .…”

Section: Introductionmentioning

confidence: 99%

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Electroactive High‐Temperature Shape Memory Polymers with High Recovery Stress Induced by Ground Carbon Fibers

Wang

Zhang

et al. 2019

Macro Chemistry & Physics

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Electroactive shape memory polymers (SMPs) are suitable for remote controllable actuators or applications where direct heat is inconvenient, and herein an electroactive shape memory polyimide (EASMPI) is reported for the first time. EASMPI is synthesized by incorporating ground carbon fibers (GCFs) into a polyimide matrix to form a compact conductive network, and percolation threshold of 0.312 S m−1 meets the demands of both electroactive and shape memory effects. The glass transition temperature of 302 °C for EASMPI is much higher than that of other electroactive SMPs, and its shape recovery is activated effectively by a voltage of 15.87 V. Recovery stress is crucial for shape memory materials to output work, and EASMPI produces high recovery stress of 40.1 MPa. The possible mechanisms are discussed, and GCF mainly accounts for its electroactivity and recovery stress. EASMPI shows vast potential in practical applications with its electroactive shape memory effect and high recovery stress at high temperature.

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Section: Doi: 101002/macp201900164mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electroactive High‐Temperature Shape Memory Polymers with High Recovery Stress Induced by Ground Carbon Fibers

Wang

Zhang

et al. 2019

Macro Chemistry & Physics

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“…The surface of each panel was painted with white then black emulsion paint to create a speckled pattern that could be picked FIGURE 5 | Shape memory PET tendon crack closure system (Teall et al, 2018).…”

Section: Monitoring Equipmentmentioning

confidence: 99%

“…This followed on from previous research at the university into the use of polyethylene terephthalate (PET) strips to induce a compressive stress in concrete, which reduces the crack size and enhances autogenous healing (Jefferson et al, 2010;Dunn et al, 2011;Isaacs et al, 2013;Hazelwood et al, 2015;Teall et al, 2015). Working with Bradford University, high-shrinkage PET tendons were developed for these site trials (Teall, 2016;Teall et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Large Scale Application of Self-Healing Concrete: Design, Construction, and Testing

et al. 2018

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Materials for Life (M4L) was a 3 year, EPSRC funded, research project carried out by the Universities of Cardiff, Bath and Cambridge to investigate the development of self-healing cementitious construction materials. This paper describes the UK's first site trial of self-healing concrete, which was the culmination of that project. The trial comprised the in-situ construction of five concrete panels using a range of self-healing technologies within the site compound of the A465 Heads of the Valleys Highway upgrading project. Four self-healing techniques were used both individually and in combination with one another. They were: (i) the use of microcapsules developed by the University of Cambridge, in collaboration with industry, containing mineral healing agents, (ii) bacterial healing using the expertise developed at Bath University, (iii) the use of a shape memory polymer (SMP) based system for crack closure and (iv) the delivery of a mineral healing agent through a vascular flow network. Both of the latter, (iii) and (iv), were the product of research undertaken at Cardiff University. This paper describes the design, construction, testing, and monitoring of these trial panels and presents the primary findings of the exercise. The challenges that had to be overcome to incorporate these self-healing techniques into full-scale structures on a live construction site are highlighted, the impact of the different techniques on the behavior of the panels when subject to loading is presented and the ability of the techniques used to heal the cracks that were generated is discussed.

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“…The results showed that the resistance of the concrete with complex graphite and steel slag increased with the increase of strain under uniaxial compression, and the process showed concordant monotonicity [1,2]. A shape memory polymer concrete crack closure system activated by electrical current was investigated by Teallet et al [3]. This stress was previously found to enhance the load recovery associated with autogenous self-healing.…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Carbon Fiber Content on the Flexural Strength of Polymer Concrete Testing Samples and the Comparison of Polymer Concrete and U-Shaped Steel Profile Damping

et al. 2019

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This article explores the effect of carbon fiber content on the flexural strength of polymer concrete testing samples and compares the damping of polymer concrete and U-shaped steel profiles. The experiments involved and described herein consisted of flexural strength testing according to STN EN 12 390-5 Testing of Hardened Concrete, Part 5: Flexural Strength of Test Samples. The test results were evaluated graphically and by calculations and were further processed in various programs. The experimental results indicated that the highest flexural strength value was obtained by the test samples containing 12% of carbon fibers while culminating at 17.9 MPa. The results showed that the highest increase of flexural strength was caused by the addition of 3% of carbon fibers to the mixture, which increased the flexural strength by 4.2 MPa, or 26.75%. The results indicated that, based on the shape of the regression curve, flexural strength culminated at 13% carbon fiber content. The experimental results demonstrated that the tested polymer concrete test sample had a 6.87 times higher attenuation coefficient than the U-shaped steel profile. The results showed that the polymer concrete test sample No. 4 reduced vibration acceleration deviation by 93.5% in 0.005 sec and the U-shaped steel profile by 32.9%.

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A shape memory polymer concrete crack closure system activated by electrical current

Cited by 45 publications

References 12 publications

Electroactive High‐Temperature Shape Memory Polymers with High Recovery Stress Induced by Ground Carbon Fibers

Electroactive High‐Temperature Shape Memory Polymers with High Recovery Stress Induced by Ground Carbon Fibers

Large Scale Application of Self-Healing Concrete: Design, Construction, and Testing

The Effect of the Carbon Fiber Content on the Flexural Strength of Polymer Concrete Testing Samples and the Comparison of Polymer Concrete and U-Shaped Steel Profile Damping

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