Self-Healing Ability of High-Strength Fibre-Reinforced Concrete with Fly Ash and Crystalline Admixture

Reddy, T. Chandra Sekhara; Theja, A Ravitheja; Sashidhar, C.

doi:10.28991/cej-0309149

Cited by 22 publications

(9 citation statements)

References 22 publications

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“…After water immersion, wet–dry cycles ensure the best self-healing performance. Wang et al [ 55 ] concluded recently that the excessive use of fly ash has a negative impact upon the mortar’s self-healing potential if the content is over 10 wt. %.…”

Section: Resultsmentioning

confidence: 99%

Early Age Sealing Capacity of Structural Mortar with Integral Crystalline Waterproofing Admixture

et al. 2021

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Crystalline admixtures embedded in concrete may react in the presence of water and generate thin crystals able to fill pores, capillaries and micro-cracks. Once the concrete has dried, the crystalline chemicals sit dormant until another dose of water starts the crystallization again. The research aims to analyses the early age self-sealing effect of a crystalline admixture at a dosage rate of 1–3% of the cement mass. Specimens made with two types of gravel were pre-loaded with three-point bending to up to 90% of the ultimate capacity, and conditioned through wet–dry cycles. Micro-crack closure was measured with a microscope after pre-loading, and after 1 day, 4 days, 8 days, 14 days and 20 days of wet–dry exposure. The results show that an admixture content of 3% achieves the best early self-sealing performance. These results are also confirmed by probabilistic analyses, which also emphasize the self-sealing potential of lower ICW contents.

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Section: Resultsmentioning

confidence: 99%

Early Age Sealing Capacity of Structural Mortar with Integral Crystalline Waterproofing Admixture

et al. 2021

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“…[151][152][153] Scanning electron microscopy (SEM), allows the observation of microdefects not visible in OM . [154][155][156] Analysis of micro-Figure 8. Camera captured an unexpected uniform increase in the specimen's temperature during tensile tests at a constant temperature.…”

Section: Qualitative Visualizationmentioning

confidence: 99%

“…[175] IR spectroscopy has also been used to monitor the progress of self-healing mechanisms both in intrinsic and extrinsic materials. [156,166,167] Raman and IR spectroscopy coupled with DSC was used to show, for the first time, the dynamic character of the urea bonds in the solidstate of the intrinsic self-healing polyurea. IR spectroscopy at different temperatures proved the reversibility of the urea bonds in this polymer and correlated the opening of the bonds with the self-healing mechanism.…”

Section: Raman Spectroscopy Fourier Transform Infrared Radiation and ...mentioning

confidence: 99%

An Overview of Self‐Healable Polymers and Recent Advances in the Field

Choufi

Mustapha

Tehrani‐Bagha

et al. 2022

Macromol. Rapid Commun.

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The search for materials with better performance, longer service life, lower environmental impact, and lower overall cost is at the forefront of polymer science and material engineering. This has led to the development of self‐healing polymers with a range of healing mechanisms including capsular‐based, vascular, and intrinsic self‐healing polymers. The development of self‐healable systems has been inspired by the healing of biological systems such as skin wound healing and broken bone reconstruction. The goal of using self‐healing polymers in various applications is to extend the service life of polymers without the need for replacement or human intervention especially in restricted access areas such as underwater/underground piping where inspection, intervention, and maintenance are very difficult. Through an industrial and scholarly lens, this paper provides: a) an overview of self‐healing polymers; b) classification of different self‐healing polymers and polymer‐based composites; c) mechanical, thermal, and electrical analysis characterization; d) applications in coating, composites, and electronics; e) modeling and simulation; and f) recent development in the past 20 years. This review highlights the importance of healable polymers for an economically and environmentally sustainable future, the most recent advances in the field, and current limitations in fabrication, manufacturing, and performance.

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“…The chemical reaction between the fly ash particles and portlandite results primarily in the formation of C-S-H gel which could vary in composition and structure [28]. CA in combination with fly ash influences the increase in C-S-H phase content leading to improved strength and durability of the mortar [29]. The formation of C-S-H phases can be observed on the surface of fly ash (cenosphere) shells, as seen in Figure 12.…”

Section: Pycnometer Absolute Density Testmentioning

confidence: 99%

The Influence of Crystalline Admixtures on the Properties and Microstructure of Mortar Containing By-Products

2020

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Crystalline admixtures and industrial by-products can be used in cement-based materials in order to improve their mechanical properties. The research examined long-term curing and the exposure to environmental actions of polymer–cement mortars with crystalline admixture (CA) and different by-products, including Bengħisa fly ash and Globigerina limestone waste filler. The by-products were introduced as a percentage replacement of the cement. A crystallization additive was also added to the mixtures in order to monitor the improvement in durability properties. The mechanical properties of the mortar were assessed, with 20% replacement of cement with fly ash resulting in the highest compressive strength after 540 days. The performance was analyzed with respect to various properties including permeable porosity, capillary suction, rapid chloride ion penetration and chloride migration coefficient. It was noted that the addition of fly ash and crystalline admixture significantly reduced the chloride ion penetration into the structure of the polymer cement mortar, resulting in improved durability. A microstructure investigation was conducted on the samples through Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy (SEM-EDS). Crystals forming through the crystalline admixture in the porous structure of the material were clearly observed, contributing to the improved properties of the cement-based polymer mortar.

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Self-Healing Ability of High-Strength Fibre-Reinforced Concrete with Fly Ash and Crystalline Admixture

Cited by 22 publications

References 22 publications

Early Age Sealing Capacity of Structural Mortar with Integral Crystalline Waterproofing Admixture

Early Age Sealing Capacity of Structural Mortar with Integral Crystalline Waterproofing Admixture

An Overview of Self‐Healable Polymers and Recent Advances in the Field

The Influence of Crystalline Admixtures on the Properties and Microstructure of Mortar Containing By-Products

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