Experimental Study on Self-Healing Capability of FRCC Using Different Types of Synthetic Fibers

Abstract:Cracking is an inherent development in reinforced concrete structures and can lead to serious damages during their service period. The repeated occurrence of such damages can enlarge the cracks, thereby allowing other deteriorating elements such as CO 2 and Cl − to further infiltrate the concrete, which can seriously compromise the concrete structure. This study focuses on the type of calcium carbonate (CaCO 3 ) crystals generated by the self-healing phenomenon. Owing to polymorphism, CaCO 3 has three types of crystal forms-calcite, vaterite, and aragonite-whose formation can be controlled by the temperature and pH. Vaterite has the highest density among these crystals, and it is expected to be capable of self-healing. Therefore, experiments were conducted to establish the conditions required to promote the generation of vaterite. A saturated Ca(OH) 2 solution with CO 2 nanobubbles (CN) was employed for effective self-healing. The temperature was controlled at 20, 40, and 60 • C, and the pH was controlled at 9.0, 10.5, and 12.0. The results showed that the self-healing of cracks occurred both on the surface and internally, and the main product of the self-healing phenomenon was vaterite in CaCO 3 crystals at a pH of 9.0 and a temperature of 40 • C. Furthermore, the addition of a saturated Ca(OH) 2 solution with CO 2 nanobubbles (CN) resulted in the most effective self-healing of the surface and internal cracks.

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“…The cracked part is also restored as a result, as reported for cracks that were narrower than 0.1 mm in earlier studies [10][11][12].…”

Section: Introductionsupporting

confidence: 53%

Control of the Polymorphism of Calcium Carbonate Produced by Self-Healing in the Cracked Part of Cementitious Materials

Choi

Inoue

et al. 2017

Applied Sciences

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“…(2) In ordinary SHCC, PVA fiber which has a hydroxide on the surface of the fiber, is normally used. Nishiwaki (2012) reported that PVA fibers become nuclei of healing product. Polyethylene fiber, however, does not have hydroxide, and thus offers lesser autogenous healing capability compared with ordinary SHCC with PVA fiber.…”

Section: Autogenous Healing Of Uhp-shcc and Its Advantagesmentioning

confidence: 99%

Recovery of Protective Performance of Cracked Ultra High Performance-Strain Hardening Cementitious Composites (UHP-SHCC) Due to Autogenous Healing

Kunieda

Kang

Ueda

et al. 2012

ACT

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A new strain hardening cementitious composite with a dense matrix, Ultra High Performance-Strain Hardening Cementitious Composites (UHP-SHCC), has been developed. This material combines excellent protective performance with a significantly higher tensile strength and strain hardening at tensile strength. Further, the material has controlled fine cracks (less than 30 microns). A low water to binder ratio with silica fume that causes a pozzolanic reaction is used in UHP-SHCC. These characteristic may give advantages for autogenous healing after the cracking. This paper presents autogenous healing behavior of cracked UHP-SHCC, and discusses about recovery of protective performance through air and water permeability test results. It was confirmed that UHP-SHCC has potentially autogenous healing properties. The air permeability coefficient and water permeation were dramatically decreased by increasing of re-curing period. Re-curing in water was more effective than re-curing in air for recovery. The effect of induced damage level on recovery of the used indices was not significant, because crack width was controlled and was almost the same among all the cracks. The repeatability of autogenous healing (twice in this study) was confirmed.

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“…[9], carbon fibres [10], synthetic fibres (e.g., polypropylene, polyethylene, polyvinyl alcohol, etc.) [11], and metallic fibres ( [12][13][14][15][16][17]) are amongst the most used fibre-shaped reinforcements. Nevertheless, over the last few years, the high cost of the commercial fibres has promoted the use of recycled metallic waste [10,18] to develop new cement-based materials that are more resilient [12], environmentally friendly [13], and with advanced properties [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Metallic Waste Addition on the Physical and Mechanical Properties of Cement-Based Mortars

et al. 2018

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Featured Application: The development of advance construction materials based on waste valorisation is a reality. The cement-based mortar with recycled metallic waste presented in this study could be potentially used as a building material with crack self-monitoring properties.Abstract: This paper investigates the influence of the type and amount of recycled metallic waste on the physical and mechanical properties of cement-based mortars. The physical and mechanical properties of cement mortars, containing four different amounts of metallic waste (ranged 4 to 16% by cement weight), were evaluated by measuring the bulk density, total porosity, flexural and compressive resistance, and dynamic elastic modulus by ultrasonic tests. All the properties were measured on test specimens under two curing ages: 7 and 28 days. Additionally, the morphological properties and elemental composition of the cement and metallic waste were evaluated by using Scanning Electron Microscopy (SEM), energy dispersive X-ray spectroscopy (EDXS), and X-ray fluorescence (XRF). Main results showed that the addition of metallic waste reduced the bulk density and increased the porosity of the cement-based mortars. Furthermore, it was observed that flexural and compressive strength proportionally increased with the metallic waste addition. Likewise, it was proven that elastic modulus, obtained by compressive and ultrasonic tests, increases with the metallic waste amount. Finally, based on a probability analysis, it was confirmed that the addition of metallic waste did not present a significant effect on the mechanical performance of the cement-based mortars.

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Experimental Study on Self-Healing Capability of FRCC Using Different Types of Synthetic Fibers

Cited by 84 publications

References 12 publications

Control of the Polymorphism of Calcium Carbonate Produced by Self-Healing in the Cracked Part of Cementitious Materials

Control of the Polymorphism of Calcium Carbonate Produced by Self-Healing in the Cracked Part of Cementitious Materials

Recovery of Protective Performance of Cracked Ultra High Performance-Strain Hardening Cementitious Composites (UHP-SHCC) Due to Autogenous Healing

Effect of Metallic Waste Addition on the Physical and Mechanical Properties of Cement-Based Mortars

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