Effects of cellulose, hemicellulose, and lignin on the morphology and mechanical properties of metakaolin-based geopolymer

Ye, Hanzhou; Zhang, Yang; Yu, Zhiming; Mu, Jun

doi:10.1016/j.conbuildmat.2018.04.028

Cited by 116 publications

(49 citation statements)

References 36 publications

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“…Only few researchers have addressed this issue. A recent study performed by Ye et al [ 49 ] concluded that higher contents of cellulose in the fibers led to a denser structure and ductile failure of metakaolin-based composites. However, higher concentration of hemicellulose and lignin reduced not only the compressive and flexural strength, but also increased the porosity of the matrix.…”

Section: Interfacial Adhesion Between Plant Fibers and Cement And mentioning

confidence: 99%

A Review on Natural Fiber-Reinforced Geopolymer and Cement-Based Composites

et al. 2020

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The use of ecological materials for building and industrial applications contributes to minimizing the environmental impact of new technologies. In this context, the cement and geopolymer sectors are considering natural fibers as sustainable reinforcement for developing composites. Natural fibers are renewable, biodegradable, and non-toxic, and they exhibit attractive mechanical properties in comparison with their synthetic fiber counterparts. However, their hydrophilic character makes them vulnerable to high volumes of moisture absorption, thus conferring poor wetting with the matrix and weakening the fiber–matrix interface. Therefore, modification and functionalization strategies for natural fibers to tailor interface properties and to improve the durability and mechanical behavior of cement and geopolymer-based composites become highly important. This paper presents a review of the physical, chemical and biological pre-treatments that have been performed on natural fibers, their results and effects on the fiber–matrix interface of cement and geopolymer composites. In addition, the degradation mechanisms of natural fibers used in such composites are discussed. This review finalizes with concluding remarks and recommendations to be addressed through further in-depth studies in the field.

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Section: Interfacial Adhesion Between Plant Fibers and Cement And mentioning

confidence: 99%

A Review on Natural Fiber-Reinforced Geopolymer and Cement-Based Composites

et al. 2020

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“…Research works have been carried out for altering brittle failure of cement based-materials into ductile failure (Silva et al, 2009;Alomayri et al, 2013;Shaikh, 2013;Bhutta et al, 2017;Ye et al, 2018;Sikora et al, 2019). This includes the use of synthetic and natural fibers as reinforcements.…”

Section: Introductionmentioning

confidence: 99%

“…A recent review reported the use of natural fibers as reinforcement materials in the cementitious matrix and the engineering properties of the resulting composites (Yan et al, 2016). It was shown that for instance only cellulose (Ye et al, 2018), flax fabric (Assaedi et al, 2015), cotton fibers (Alomayri et al, 2013(Alomayri et al, , 2014b, and luffa cylindrical (Alshaaer et al, 2017) have been used as natural fibers for the reinforcement of the geopolymer matrix. These works highlighted the improvement of the physical and mechanical properties of composites.…”

Section: Introductionmentioning

confidence: 99%

Iron-rich laterite-bagasse fibers based geopolymer composite: Mechanical, durability and insulating properties

Nkwaju

Djobo

Nouping

et al. 2019

Applied Clay Science

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This work reports the mechanical, durability and insulating properties of novel geopolymer composites made of iron-rich laterite and sugarcane bagasse fibers with sodium silicate as a hardener. The results showed that the addition of fibers was beneficial for improving the fracture behavior of iron-rich laterite based geopolymer from brittle to ductile. The 28 days compressive strength ranges from 50 MPa to 14 MPa with the content of fibers. The modulus of elasticity was improved by 50% with only 3 wt% of fibers. The geopolymer composites perform well after 20 wet-dry cycles with the improvement of its ductility. The 28 days thermal conductivity decreases from 0.77 W/mK to 0.55 W/mK with the fibers content.

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“…A three-dimensional amorphous aluminosilicate network is formed due to the geopolymerization process through the linking of SiO 4 and AlO 4 by sharing their oxygen atoms in a high alkalinity environment [17,18]. Although numerous studies have been dedicated to the reinforcement of the geopolymer matrix with wood [10,19,20], only a few studied the potential of geopolymer as a binder for solid wood bonding [21][22][23]. A few studies have also been devoted to the use of geopolymer as a binder to produce wood-based products [9,[24][25][26].…”

Section: Introductionmentioning

confidence: 99%

“…The requisite adhesion strength between the materials stems from the intrinsic adhesion forces across the interface of materials, as well as the toughness of adhesive joints [6,27]. Although extensive research has been conducted on bonding improvements of wood with synthetic binders, there are only few studies on wood and inorganic binders [20,28]. Even less information exists about bonding enhancement of geopolymer with wood [9,29].…”

Section: Introductionmentioning

confidence: 99%

Geopolymer-Bonded Laminated Veneer Lumber as Environmentally Friendly and Formaldehyde-Free Product: Effect of Various Additives on Geopolymer Binder Features

Shalbafan

Thoemen

2020

Applied Sciences

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Environmentally friendly and formaldehyde-free laminated veneer lumber (LVL) was manufactured using geopolymer constituents as binder. The main aim of the study was to improve the bonding quality between the geopolymer binder and the wood constituents. To this end, the effect of various additives (phenol flakes, conventional silica fume, and grafted silica fume with 3-aminopropyltriethoxysilane (APTES)) in the geopolymer binder features were explored via gel time and viscosity measurements, differential scanning calorimetry (DSC), and Fourier transom infrared spectroscopy. The mechanical properties (shear, bending, and compression) of LVL panels were also determined. Results showed that adding both types of silica fume had a positive impact on the geopolymer binder features. The formation of an alkaline aluminosilicate network was proven by observing the characteristics peaks of geopolymer binder at about 683 and 970 cm−1. A peak temperature of about 98 °C was determined for the geopolymer binder curing via DSC analysis. The mechanical properties were the highest for LVL panels made of geopolymer binder with grafted silica fume. It is feasible that the APTES used as grafting agent created a better bonding mechanism with superficial wood cells. In summary, the produced LVL panel showed good properties, but it still needs to be further improved to reach the required levels for use in interior and humid application.

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Effects of cellulose, hemicellulose, and lignin on the morphology and mechanical properties of metakaolin-based geopolymer

Cited by 116 publications

References 36 publications

A Review on Natural Fiber-Reinforced Geopolymer and Cement-Based Composites

A Review on Natural Fiber-Reinforced Geopolymer and Cement-Based Composites

Iron-rich laterite-bagasse fibers based geopolymer composite: Mechanical, durability and insulating properties

Geopolymer-Bonded Laminated Veneer Lumber as Environmentally Friendly and Formaldehyde-Free Product: Effect of Various Additives on Geopolymer Binder Features

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