Natural fiber-reinforced shotcrete mixture: Quantitative assessment of the impact of fiber on fresh and plastic shrinkage cracking properties

Choi, Seung‐Hak; Panov, Valerii; Han, Seungyeon; Yun, Kyong-Ku

doi:10.1016/j.conbuildmat.2022.130032

Cited by 16 publications

(3 citation statements)

References 53 publications

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“…Furthermore, the utilization of fiber significantly prolongs the initial cracking time and substantially improved the concrete's resistance to cracking caused by drying. Furthermore, several researchers have posited that the incorporation of fibers into concrete can effectively mitigate shrinkage cracking and enhance its resistance to shrinkage (Choi et al, 2023;Zhou et al, 2023). Moreover, Chen et al (2022) conducted a study examining the impact of varying lengths of polypropylene fiber in concrete.…”

Section: Introductionmentioning

confidence: 99%

Increasing the Length of Concrete Pavement Slabs Using Shrinkage Reducing Admixture and Polypropylene Fiber

Gholami,

Moghadas Nejad,

Ramezanianpour

2024

Int J Concr Struct Mater

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Pavement engineers frequently employ concrete pavements because of their benefits such as extended lifetime, superior performance and durability, and so on. However, there are some disadvantages of these pavements such as shrinkage which may lead to cracking, warping, and limiting the length of the concrete pavement slabs. Shrinkage reducing admixture (SRA) and polypropylene fibers can be employed to prevent or control shrinkage cracking. In this study, increasing the length of concrete pavement slabs using shrinkage reducing admixture and polypropylene fiber was investigated. For mix compositions, two water–cement ratios of 0.35 and 0.4 were employed, and the percentages of SRA and polypropylene fiber utilized in mixes were 2% and 1% by weight of cement, respectively. Slump, compressive strength, third point flexural strength, electrical resistance, free and restrained shrinkage tests were carried out as the experimental programming to investigate the effect of these materials on concrete behavior and evaluate the amount of concrete pavement design parameters. Statistical analysis and RSM were used to determine the significance of each parameter and their interactions on concrete properties. It was observed that the use of SRA had no influence on workability; however, polypropylene fibers reduced the slump flow of concrete. Also, the use of SRA resulted in a decrease in mechanical properties. In addition, the use of polypropylene fibers considerably enhanced the energy absorption of concrete. Furthermore, on concrete containing SRA and polypropylene fiber, the magnitude of free and restrained shrinkage and crack width were reduced. Finally, the length and thickness of concrete pavement slabs were evaluated using the experimental results on the Tehran-Shomal freeway as a case study. The slab length could be increased by about 20% without any significant change in the slab thickness using SRA and polypropylene fiber in concrete mix composition. This can lead to an increase in construction speed, improve the durability of pavement and generally increase the quality of the concrete pavement.

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Section: Introductionmentioning

confidence: 99%

Increasing the Length of Concrete Pavement Slabs Using Shrinkage Reducing Admixture and Polypropylene Fiber

Gholami,

Moghadas Nejad,

Ramezanianpour

2024

Int J Concr Struct Mater

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“…Fibers are effective in this regard for two reasons: first, they reduce overall shrinkage deformations and reduce the possibility of tensile stresses exceeding tensile strength, and second, fibers can restrict their development if they occur [ 22 , 34 ]. The addition of any fiber with a diameter less than 40 μm and an aspect ratio greater than 200, in volume fractions of 0.2% to 0.4%, should effectively eliminate plastic shrinkage cracking in concrete [ 22 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ]. Therefore, a wide variety of fibers have now been shown to be beneficial in this regard, including steel, glass, basalt, various synthetic fibers (polypropylene, polyethylene, polyvinyl and carbon) and various natural fibers (sisal, coir, flax and cellulose) [ 15 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 32 , 33 , 40 , 42 , 43 , 44 , 45 , 46 ].…”

Section: Introductionmentioning

confidence: 99%

Portland Cement-Based Grouts Enhanced with Basalt Fibers for Post-Tensioned Concrete Duct Filling

et al. 2023

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In post-tensioned systems, grouts act as a last line of defense to prevent the penetration of harmful compounds such as chlorides, moisture and other substances that cause corrosion in the prestressing steel. For this reason, improving grouts results in the enhancement of the overall durability of the structure. In this study, the physical properties of grouts with basalt microfiber additions in the amounts of 0.03, 0.07 and 0.10% with respect to the mix volume were evaluated. The fresh properties included flowability and unit mass. Specimens were fabricated to evaluate drying shrinkage, compressive strength, air permeability and rapid permeability to chloride ions. The incorporation of basalt microfibers showed a beneficial effect on the physical properties of the grout by increasing the drying shrinkage resistance and decreasing the permeability compared to the reference mix and two commercial dry prepackaged grouts. The optimal grout mix was the one with a percentage of basalt microfibers of 0.10%, which decreased drying shrinkage by 15.98% at 14 days compared to the reference mix, and permeability to chloride ions decreased by 10.82% compared to the control mix.

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“…The high-yield stress of these mixtures demonstrates an increased capillary pressure owing to their high capacity to absorb free water and reduce capillary pore size. The formation of plastic shrinkage cracks is highly complex, and it can be attributed to several factors, including construction technology, environmental factors, mixture properties, and the material composition itself [86]. The supplementary cementitious materials used in this study can generally improve mechanical properties (for instance, CS and SF) or retard them (UFFA).…”

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confidence: 99%

Prediction of Plastic Shrinkage Cracking of Supplementary Cementitious Material-Modified Shotcrete Using Rheological and Mechanical Indicators

Yun,

Panov,

Han

2023

Materials

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Plastic shrinkage cracking is a complex and multifaceted process that occurs in the period between placement and the final setting. During this period, the mixture is viscoplastic in nature and therefore possesses rheological properties. The investigation of the relationship between rheological behavior and its propensity to undergo cracking during the plastic phase presents an intriguing subject of study. However, many factors influence plastic cracking, and the corresponding interaction of its effects is complex in nature. This study aimed to evaluate the impact of rheological and physicomechanical properties on the occurrence of plastic cracking in high-performance shotcrete containing various supplementary cementitious materials. To achieve this, plastic cracking was evaluated employing the ASTM C 1579 standard and a smart crack viewer FCV-30, and the rheological parameters were controlled using an ICAR rheometer. In addition, a study was conducted to assess the strength development and fresh properties. Further, a relationship was established via statistical evaluation, and the best predicting models were selected. According to the study results, it can be concluded that high-yield stress and low plastic viscosity for colloidal silica mixtures are indicators of plastic cracking resistance owing to improved fresh microstructure and accelerated hydration reaction. However, earlier strength development and the presence of a water-reducing admixture allowed mixtures containing silica fume to achieve crack reduction. A higher indicator of yield stress is an indicator of the capillary pressure development of these mixtures. In addition, a series containing ultrafine fly ash (having high flow resistance and torque viscosity) exhibited a risk of early capillary pressure build-up and a decrease in strength characteristics, which could be stabilized with the addition of colloidal silica. Consequently, the mixture containing both silica fume and colloidal silica exhibited the best performance. Thus, the results indicated that rheological characteristics, compressive strength, and water-reducer content can be used to control the plastic shrinkage cracking of shotcrete.

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Natural fiber-reinforced shotcrete mixture: Quantitative assessment of the impact of fiber on fresh and plastic shrinkage cracking properties

Cited by 16 publications

References 53 publications

Increasing the Length of Concrete Pavement Slabs Using Shrinkage Reducing Admixture and Polypropylene Fiber

Increasing the Length of Concrete Pavement Slabs Using Shrinkage Reducing Admixture and Polypropylene Fiber

Portland Cement-Based Grouts Enhanced with Basalt Fibers for Post-Tensioned Concrete Duct Filling

Prediction of Plastic Shrinkage Cracking of Supplementary Cementitious Material-Modified Shotcrete Using Rheological and Mechanical Indicators

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