Material enhancements of newly developed stiff type polyurea for retrofitting of concrete structures

Lee, Tae Hee; Park, Jun‐Hee; Yang, Dal-Hun; Kim, Jang-Ho Jay; Noor, Norhazilan Md

doi:10.1016/j.cscm.2022.e01431

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…Polyurea is gaining significant attention in the construction industry as a structural retrofit and reinforcement material due to its ability to be easily sprayed onto the surfaces of structural members without the need for an epoxy bond interface [69]. Additionally, composite sandwich structures can be created to effectively handle damage across various situations [70,71].…”

Section: Construction and Infrastructurementioning

confidence: 99%

Recent Developments in Polyurea Research for Enhanced Impact Penetration Resistance and Blast Mitigation

Wang,

Ding,

Lin

et al. 2024

Polymers

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Polyurea has gained significant attention in recent years as a functional polymer material, specifically regarding blast and impact protection. The molecular structure of polyurea is characterized by the rapid reaction between isocyanate and the terminal amine component, and forms an elastomeric copolymer that enhances substrate protection against blast impact and fragmentation penetration. At the nanoscale, a phase-separated microstructure emerges, with dispersed hard segment microregions within a continuous matrix of soft segments. This unique microstructure contributes to the remarkable mechanical properties of polyurea. To maximize these properties, it is crucial to analyze the molecular structure and explore methods like formulation optimization and the incorporation of reinforcing materials or fibers. Current research efforts in polyurea applications for protective purposes primarily concentrate on construction, infrastructure, military, transportation and industrial products and facilities. Future research directions should encompass deliberate formulation design and modification, systematic exploration of factors influencing protective performance across various applications and the integration of numerical simulations and experiments to reveal the protective mechanisms of polyurea. This paper provides an extensive literature review that specifically examines the utilization of polyurea for blast and impact protection. It encompasses discussions on material optimization, protective mechanisms and its applications in blast and impact protection.

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Section: Construction and Infrastructurementioning

confidence: 99%

Recent Developments in Polyurea Research for Enhanced Impact Penetration Resistance and Blast Mitigation

Wang,

Ding,

Lin

et al. 2024

Polymers

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“…Scholars' research on polyurea-coated concrete focuses more on its anti-explosion performance, see the literature of Iqbal, Chen, Lee, and others. [22][23][24][25] Recent studies had shown that coating polyurea on the surface of fiber/resin composites to form composite structures was conducive to improving the impact resistance of composite structures, which can further enhance the lightweight and high-strength properties of protective structures. Moreover, the location of polyurea layer affected the increase of impact resistance of composite structures and the failure mode of fiber/resin composites.…”

Section: Introductionmentioning

confidence: 99%

Enhancement effect of polyurea coating on the impact resistance of aluminum foam

Guo

Song

Sun

et al. 2023

J of Applied Polymer Sci

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A polyurea coating was prepared to enhance the impact protection performance of aluminum foam, and its mechanical properties were analyzed. Polyurea‐coated aluminum foam composite specimens were prepared by coating the polyurea on the surface of aluminum foam. The mechanical properties of composite specimens under quasi‐static and dynamic loading were tested, and the stress–strain relationship at different strain rates was analyzed. The deformation process and failure mode of typical specimens under different loading conditions were discussed. The influence of polyurea coating on the energy absorption characteristics of aluminum foam was explained. The results show that when the polyurea is coated on the end surface of aluminum foam specimen, the sawtooth oscillation in the yield plateau stage of the stress–strain curve is weakened. The existence of polyurea coating makes the stress transfer of cell wall of aluminum foam uniform, and can effectively prevent the damage caused by the splash of aluminum foam fragments under high‐speed impact load. Coating polyurea on the opposite to load‐receiving surface of aluminum foam specimen can effectively improve the yield stress of composite specimen under dynamic load, and make the specimen still maintain good integrity after failure. When the polyurea is coated on the end surface of aluminum foam specimen, the final energy absorption per unit volume and the ideal energy absorption efficiency peak of the specimen are improved.

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“…Anas et al [15] reviewed major publications related to the blast response of the RC slabs, including failure modes such as the spalling of concrete and concrete scabbing. Lee et al [16] developed stiff-type polyuria by varying the prepolymer/hardener ratio of flexible-type polyuria as a structural retrofitting and strengthening material. There have been studies on the strengthening method of discrete fiber-reinforced polyurea (DFRP), mixing polyurea with high tensile strength and elongation and chopped glass fibers for further improving the tensile strength.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Dynamic Vibration Control Techniques by the GFRPU and/or LTMD System

Song

Jang

et al. 2022

Polymers

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Reinforced concrete (RC) structures with non-seismic reinforcement details are vulnerable to earthquakes. This experimental study evaluates the efficiency of three techniques to alleviate the dynamic responses of existing structures: glass fiber-reinforced polyurea (GFRPU) reinforcement, a lever-typed tuned mass damper (LTMD) system, and a hybrid system of GFRPU and LTMD reinforcements. The lateral-resisting capacity and ductility of the GFRPU reinforcement specimen were enhanced by the material characteristics, and the dynamic responses were alleviated. The LTMD control specimen controlled the dynamic responses by the passive control system of the tuned mass damper (TMD), and the control forces to sustain its geometric motion were exerted on the specimen. The hybrid system was designed to control the dynamic responses by the GFRPU reinforcement and the LTMD control system. Four specimens, including an unreinforced specimen, were tested under external excitations, including the El Centro earthquake. The vibrations were more controlled in the order of the GFRPU reinforcement specimen, the LTMD control specimen, and the hybrid control specimen. The hybrid system was evaluated as excellent for seismic reinforcement, such as preventing abrupt failure with the lateral-resisting capacity and ductility of GFRPU and improving the dynamic control capacity by LTMD.

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Material enhancements of newly developed stiff type polyurea for retrofitting of concrete structures

Cited by 3 publications

References 17 publications

Recent Developments in Polyurea Research for Enhanced Impact Penetration Resistance and Blast Mitigation

Recent Developments in Polyurea Research for Enhanced Impact Penetration Resistance and Blast Mitigation

Enhancement effect of polyurea coating on the impact resistance of aluminum foam

Comparison of Dynamic Vibration Control Techniques by the GFRPU and/or LTMD System

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