Effect of Different Hydrothermal Treatments (Steam and Hot Compressed Water) on Physical Properties and Drying Behavior of Yellow-Poplar (Liriodendron tulipifera)

Rahimi, Shaban; Singh, Kaushlendra; DeVallance, David

doi:10.13073/fpj-d-18-00028

Cited by 14 publications

(7 citation statements)

References 37 publications

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“…Salim et al [60] reported that steaming and compression at a high temperature enhanced the physical properties and dimensional stability of intensive OPT. Rahimi et al [45] reported that hydrothermal modification (140 • C) significantly changed the total porosity of yellow poplar (Liriodendron tulipifera Linnaeus) samples, and that hydrothermal modification significantly increased water absorption for all treatments except hot compressed water at 100 • C.…”

Section: Physical Propertiesmentioning

confidence: 99%

“…The authors also mentioned that the MOE of the thermally modified samples was reduced with increased treatment temperature and time. Rahimi et al [45] investigated the effects of different hydrothermal modifications (steam and hot compressed water) on the physical properties and drying behavior of yellow poplar (Liriodendron tulipifera). They found that hydrothermally treated samples (100 and 140 • C) exhibited a greater modulus of elasticity than that of the control samples.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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Hydrothermal Modification of Wood: A Review

et al. 2021

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Wood is a versatile material that is used for various purposes due to its good properties, such as its aesthetic properties, acoustic properties, mechanical properties, thermal properties, etc. Its poor dimensional stability and low natural durability are the main obstacles that limit its use in mechanical applications. Therefore, modification is needed to improve these properties. The hydrothermal modification of wood exposes wood samples to elevated temperatures and pressure levels by using steam, water, or a buffer solution as the treating medium, or by using superheated steam. Abundant studies regarding hydrothermally treated wood were carried out, but the negative effect on the wood’s strength is one of the limitations. This is a method that boosts the dimensional stability and improves the decay resistance of wood with minimal decrements of the strength properties. As an ecofriendly and cost-effective method, the hydrothermal modification of wood is also a promising alternative to conventional chemical techniques for treating wood. Researchers are attracted to the hydrothermal modification process because of its unique qualities in treating wood. There are many scientific articles on the hydrothermal modification of wood, and many aspects of hydrothermal modification are summarized in review papers in this field. This paper reviews the hydrothermally modified mechanical properties of wood and their potential applications. Furthermore, this article reviews the effects of hydrothermal modification on the various properties of wood, such as the dimensional stability, chemical properties, and durability against termites and fungi. The merits and demerits of hydrothermal wood modification, the effectiveness of using different media in hydrothermal modification, and its comparison with other treating techniques are discussed.

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Section: Physical Propertiesmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

Hydrothermal Modification of Wood: A Review

et al. 2021

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“…Jianxiong L. et al [6] conducted a heat treatment of poplar by steam media and established a regression model between color difference, treatment temperature, and time and obtained the conclusion that the color of wood will gradually transition from primary color to dark brown after heat treatment. Sohrab Rahimi et al [7] compared heat treatments with water and steam media, and they noted that the use of water media causes the degradation of intercellular cavities and wood cells, which can lead to an increase in wood permeability and water absorption, which, in turn, affects the moisture content of the wood, while the use of steam media changes the cell wall structure, which reduces the modulus of elasticity and modulus of rupture of wood samples.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Mechanical Properties of Thermally Modified Wood Based on TSSA-BP Model

Wang

2022

Forests

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In order to demonstrate whether the sparrow search algorithm can show good performance in optimization, this paper improves the prediction model by this algorithm and predicts the change data of wood mechanical properties under different conditions, which better reflects the connection between the process parameters of wood heat treatment and the change of wood mechanical properties. The article takes the five main mechanical property parameters of thermally modified wood: compressive strength along the grain, flexural strength, flexural elastic modulus, radial hardness, and tangential hardness, respectively, as the objects of study and improves the sparrow search algorithm by Tenting chaotic mapping and then optimizes the Back Propagation (BP) network model by this algorithm. The results show that the number of iterations of the optimized Tent-Sparrow search algorithm-Back Propagation network model (TSSA-BP) is only one-eighth that of the original BP network model, and the convergence speed is greatly improved, the root mean square error of the TSSA-BP model is at least one-half times that of the original BP model, and the optimized model fits the original data better in terms of predicted values; thus, this article provided a feasible prediction algorithm for the field related to the mechanical property changes of wood after heat treatment.

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“…In addition, it is different from other methods because of the existence of a hydrolysis step. Nowadays, hydrothermal treatment of wood has been implemented by several researchers [7,8,10,11]. The efficacy of hydrothermal treatment is mainly dependent on treatment temperature, duration and also the heating media [12].…”

Section: Introductionmentioning

confidence: 99%

Physical Properties of Hydrothermally Treated Rubberwood [Hevea brasiliensis (Willd. ex A. Juss.) Müll. Arg.] in Different Buffered Media

Ali

Abdullah

Ashaari

et al. 2022

Forests

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The dimensional instability of rubberwood [Hevea brasiliensis (Willd. ex A. Juss.) Müll. Arg.] is one of the major drawbacks that limits its utilization. Therefore, treatment is needed to improve these properties. Hydrothermal treatment in different buffered media is one of the techniques that improve its dimensional stability. The physical properties of hydrothermally treated rubberwood in different buffered media (pH 4, 6, 8, 10) and tap water (pH 7.43) with different temperatures (160 °C, 180 °C and 200 °C) were studied. In this study, physical properties such as equilibrium moisture content (EMC), density (ρ), mass loss (ML), water absorption (WA), volumetric swelling coefficient (VSC), thickness swelling (TS) and anti-swelling efficiency (ASE) were investigated for both treated and untreated specimens. Both the buffered media and temperature significantly affected the physical properties. The results indicated that the EMC (%), ρ (kg/m3), ML (%), VSC (%), TS (%) of treated rubberwood samples reduced as the treatment temperature increased. With the exception of WA (%), as WA increased when the treatment temperature increased from 160 °C to 180 °C but started to decrease when the temperature was further increased to 200 °C. The research study also exhibited that hydrothermal treatment using buffered media at different temperatures enhanced the dimensional stability of the treated samples. Alkaline media gave the best results on the physical properties compared to other treatment medias.

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Effect of Different Hydrothermal Treatments (Steam and Hot Compressed Water) on Physical Properties and Drying Behavior of Yellow-Poplar (Liriodendron tulipifera)

Cited by 14 publications

References 37 publications

Hydrothermal Modification of Wood: A Review

Hydrothermal Modification of Wood: A Review

Prediction of Mechanical Properties of Thermally Modified Wood Based on TSSA-BP Model

Physical Properties of Hydrothermally Treated Rubberwood [Hevea brasiliensis (Willd. ex A. Juss.) Müll. Arg.] in Different Buffered Media

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