Effect of the state of conservation of the hemp used in geopolymer and hydraulic lime concretes

Sáez-Pérez, Ma Paz; Brümmer, Monika; Suárez, Jorge Alberto Durán

doi:10.1016/j.conbuildmat.2021.122853

Cited by 24 publications

(9 citation statements)

References 63 publications

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“…Trindade et al [ 59 ] adopted a one-way and bidirectional arrangement of sisal and jute as reinforcement materials and showed that the composite material exhibits strain and flexural hardening behavior under tensile and bending action and produces multiple cracks. Sáez-Pérez et al [ 60 ] found that under the two experimental conditions of fresh and wet storage for 6 months, similar to other pretreatment methods to improve the properties of hemp fiber, wet storage caused an increase in cellulose content and improved the mechanical properties of the geopolymer. Na et al [ 61 ] soaked alkali-treated Kenaf fiber in 1 mol/L CaCl 2 solution, which improved the compatibility between fiber and matrix, increased the flexural strength by 69.1%, and increased the toughness by 473%.…”

Section: Research Status Of the Durability Of Cfgcsmentioning

confidence: 99%

Durability of Cellulosic-Fiber-Reinforced Geopolymers: A Review

Liu

2022

Molecules

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Geopolymers have high early strength, fast hardening speed and wide sources of raw materials, and have good durability properties such as high temperature resistance and corrosion resistance. On the other hand, there are abundant sources of plant or cellulose fibers, and it has the advantages of having a low cost, a light weight, strong adhesion and biodegradability. In this context, the geopolymer sector is considering cellulose fibers as a sustainable reinforcement for developing composites. Cellulosic-fiber-reinforced geopolymer composites have broad development prospects. This paper presents a review of the literature research on the durability of cellulosic-fiber-reinforced geopolymer composites in recent years. In this paper, the typical properties of cellulose fibers are summarized, and the polymerization mechanism of geopolymers is briefly discussed. The factors influencing the durability of cellulosic-fiber-reinforced geopolymer composites were summarized and analyzed, including the degradation of fibers in a geopolymer matrix, the toughness of fiber against matrix cracking, the acid resistance, and resistance to chloride ion penetration, high temperature resistance, etc. Finally, the influence of nanomaterials on the properties of geopolymer composites and the chemical modification of fibers are analyzed, and the research on cellulosic-fiber-reinforced geopolymer composites is summarized.

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Section: Research Status Of the Durability Of Cfgcsmentioning

confidence: 99%

Durability of Cellulosic-Fiber-Reinforced Geopolymers: A Review

Liu

2022

Molecules

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“…Finally, in the heat treatment, the fibers are cleaned and dried and then heated, reaching a temperature of up to 200 °C. The heat treatment promotes a reduction in the hemicellulose and lignin contents of the fibers, increasing their stiffness [ 96 ].…”

Section: Surface Treatment Of Natural Fibersmentioning

confidence: 99%

Natural Fibers as an Alternative to Synthetic Fibers in Reinforcement of Geopolymer Matrices: A Comparative Review

Azevedo¹,

Cruz²,

Marvila³

et al. 2021

Polymers

112

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Geopolymer materials have been gaining ground in the civil construction sector not only for having superior physical properties when compared to conventional cement, but also for being less harmful to the environment, since the synthesis of the geopolymer does not release toxic gases or require high energy costs. On the other hand, geopolymer materials like cementitious matrices have low flexural strength and have fragile breakage. To overcome these deficiencies, the insertion of fibers in geopolymeric matrices has been evaluated as a solution. Although most research on this practice focuses on the use of synthetic fibers, the use of natural fibers has been growing and brings as an advantage the possibility of producing an even more ecological material, satisfying the need to create eco-friendly materials that exists today in society. Thus, this paper aimed to, through the evaluation of research available in the literature, understand the behavior of fibers in geopolymer matrices, identify similarities and differences between the performance of geopolymer composites reinforced with natural and synthetic fibers and, understanding that it is possible, point out ways to optimize the performance of these composites.

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“…With low chloride ion penetrability, it could be affirmed that the geopolymer-blended recycled concrete offered good protection to steel reinforcement against corrosion. It is notable that there are a number of published research papers [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 ] on the mechanical properties of geopolymer concrete without revealing the findings on its durability characteristics. Guided by these developments, it is the aim of this article to review and evaluate the durability aspects of geopolymer concrete.…”

Section: Introductionmentioning

confidence: 99%

Durability Performance of Geopolymer Concrete: A Review

Wong

2022

Polymers

107

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Geopolymer concrete is produced from the geopolymerization process, in which molecules known as oligomers integrate to form geopolymer networks with covalent bonding. Its production expends less thermal energy and results in a smaller carbon footprint compared to Ordinary Portland Cement (OPC) concrete. It requires only an alkaline activator to catalyze its aluminosilicate sources such as metakaolin and fly ash, to yield geopolymer binder for the geopolymerization to take place. Because of its eco-friendly technology and practical application, current research interest is mainly concentrated on the endurance of geopolymer concrete to resist heat and chemical aggressions. As such, it is pertinent for this review article to provide critical insight into the recent progress in research on the durability of geopolymer concrete. One significant outcome of the review is that the admixture of geopolymer concrete could be blended with additives such as micro-silica and fibers such as polypropylene fibers, to enhance its durability. The review on the durability aspects of geopolymer concrete showed that it had high compressive strength at an optimal elevated temperature, low to medium chloride ion penetrability, and high resistance to acid attack and abrasion. This makes geopolymer concrete a viable candidate to replace OPC concrete in the construction industry.

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Effect of the state of conservation of the hemp used in geopolymer and hydraulic lime concretes

Cited by 24 publications

References 63 publications

Durability of Cellulosic-Fiber-Reinforced Geopolymers: A Review

Durability of Cellulosic-Fiber-Reinforced Geopolymers: A Review

Natural Fibers as an Alternative to Synthetic Fibers in Reinforcement of Geopolymer Matrices: A Comparative Review

Durability Performance of Geopolymer Concrete: A Review

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