Effects of Wetting and Drying Cycles on Microstructure Change and Mechanical Properties of Coconut Fibre-Reinforced Mortar

Bui, Huyen; Levacher, Daniel; Boutouil, Mohamed; Sebaïbi, Nassim

doi:10.3390/jcs6040102

Cited by 3 publications

(2 citation statements)

References 32 publications

(41 reference statements)

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“…The highly complex arrangement of cellulose microfibril makes cellulose fibers more resistant to chemical and biological attacks [ 67 ]. Although cellulose degrades into chemicals to some extent, it is highly resistant to hydrolysis, oxidants, and strong bases.…”

Section: Degradation Behavior Of Pfs In Geopolymer Matrixmentioning

confidence: 99%

“…Methacanon et al [ 61 ] studied the performance of reinforced geotextiles produced with reed, sisal, water hyacinth, and coiled hemp fibers and found that reed fibers and water hyacinth fibers contained a higher content of hemicellulose and could absorb more water, which could lead to thermal degradation at lower temperatures. In their test sample, Bui et al [ 67 ] observed no decomposition peak after five drying and wetting cycles in the temperature range of 270 °C to 300 °C, indicating that the coir fibers in the gel matrix did not undergo thermal degradation and were naturally degraded.…”

Section: Degradation Behavior Of Pfs In Geopolymer Matrixmentioning

confidence: 99%

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Alkaline Degradation of Plant Fiber Reinforcements in Geopolymer: A Review

Liu

2023

Molecules

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Plant fibers (PFs), such as hemp, Coir, and straw, are abundant in resources, low in price, light weight, biodegradable, have good adhesion to the matrix, and have a broad prospect as reinforcements. However, the degradation of PFs in the alkaline matrix is one of the main factors that affects the durability of these composites. PFs have good compatibility with cement and the geopolymer matrix. They can induce gel growth of cement-based materials and have a good toughening effect. The water absorption of the hollow structure of the PF can accelerate the degradation of the fiber on the one hand and serve as the inner curing fiber for the continuous hydration of the base material on the other. PF is easily deteriorated in the alkaline matrix, which has a negative effect on composites. The classification and properties of PFs, the bonding mechanism of the interface between PF reinforcements and the matrix, the water absorption of PF, and its compatibility with the matrix were summarized. The degradation of PFs in the alkaline matrix and solution, drying and wetting cycle conditions, and high-temperature conditions were reviewed. Finally, some paths to improve the alkaline degradation of PF reinforcement in the alkaline matrix were proposed.

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Section: Degradation Behavior Of Pfs In Geopolymer Matrixmentioning

confidence: 99%

Section: Degradation Behavior Of Pfs In Geopolymer Matrixmentioning

confidence: 99%

Alkaline Degradation of Plant Fiber Reinforcements in Geopolymer: A Review

Liu

2023

Molecules

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Influence of Variatropy on the Evaluation of Strength Properties and Structure Formation of Concrete under Freeze-Thaw Cycles

et al. 2023

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The resistance of concrete structures to the impact of cyclic freezing and thawing is one of the key long-term characteristics, which further determines the operation and its service life. To date, the resistance to alternating freeze-thawing cycles under various operating conditions of concrete structures has been little studied related to several manufacturing processes: simple vibrated, variotropic centrifuged, and improved variotropic vibrocentrifuged. The purpose of this study is to investigate the effect of heavy concrete manufacturing technology on the resistance of concrete to alternate freezing and thawing in an aggressive environment of 5% sodium chloride solution, as well as to study the trend in strength characteristics and weight loss of vibrated, centrifuged and vibrocentrifuged concretes after a series of freezing and thawing cycles. Standardized techniques for assessing the characteristics of concrete and scanning electron microscopy were used. Vibrated, centrifuged, and vibrocentrifuged concretes made from the same raw materials have differences in weight loss of 4.5%, 3%, and 2%, respectively, and in strength of 15.0%, 13.5%, and 10%, respectively, when tested for frost resistance in similar environments after 15 cycles by the accelerated method. Centrifuged and especially vibrocentrifuged variotropic concrete have greater resistance and endurance to cycles of alternate freezing and thawing compared to vibrated.

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Effect of Wet–Dry Cycling on Properties of Natural-Cellulose-Fiber-Reinforced Geopolymers: A Short Review

Lv,

He,

Pang

et al. 2023

Molecules

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To study the long-term properties of cement-based and geopolymer materials exposed to outdoor environments, wet–dry cycles are usually used to accelerate their aging. The wet–dry cycling can simulate the effects of environmental factors on the long-term properties of the composites under natural conditions. Nowadays, the long-term properties of geopolymer materials are studied increasingly deeply. Unlike cement-based materials, geopolymers have better long-term properties due to their high early strength, fast hardening rate, and wide range of raw material sources. At the same time, natural cellulose fibers (NCFs) have the characteristics of abundant raw materials, low price, low carbon, and environmental protection. The use of NCFs as reinforcements of geopolymer matrix materials meets the requirements of sustainable development. In this paper, the types and properties of NCFs commonly used for geopolymer reinforcement and the polymerization mechanism of geopolymer matrix materials are summarized. By analyzing the properties of natural-cellulose-fiber-reinforced geopolymers (NCFRGs) under non-wet–dry cycles and NCFRGs under wet–dry cycles, the factors affecting the long-term properties of NCFRGs under wet–dry cycles are identified. Meanwhile, the degradation mechanism and mechanical properties of NCFRG composites after wet–dry cycles are analyzed. In addition, the relationship between the properties of composites and the change of microstructure of fiber degradation is further analyzed according to the results of microscopic analysis. Finally, the effects of wet–dry cycles on the properties of fibers and geopolymers are obtained.

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Effects of Wetting and Drying Cycles on Microstructure Change and Mechanical Properties of Coconut Fibre-Reinforced Mortar

Cited by 3 publications

References 32 publications

Alkaline Degradation of Plant Fiber Reinforcements in Geopolymer: A Review

Alkaline Degradation of Plant Fiber Reinforcements in Geopolymer: A Review

Influence of Variatropy on the Evaluation of Strength Properties and Structure Formation of Concrete under Freeze-Thaw Cycles

Effect of Wet–Dry Cycling on Properties of Natural-Cellulose-Fiber-Reinforced Geopolymers: A Short Review

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