Swelling and shrinkage behaviors of cross-laminated timber made of different species with various lamina thickness and combinations

Pang, Sung-Jun; Jeong, Gi Young

doi:10.1016/j.conbuildmat.2019.117924

Cited by 20 publications

(10 citation statements)

References 10 publications

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“…The higher PPP CLT shrinkage value than other samples is in line with the shrinkage characteristics of the raw materials in Table 4. Several others also showed the effect of moisture content on the CLT dimensional study (Kukk et al 2021;Pang and Jeong 2020). The higher value of CLT MC is more susceptible to dimensional changes affecting mechanical quality (Silva et al 2016).…”

Section: Physical Properties Of Cltmentioning

confidence: 97%

Physical and Mechanical Properties of Cross-Laminated Timber Made of a Combination of Mangium-Puspa Wood and Polyurethane Adhesive

Hariz

Hadi

Maulana³

et al. 2023

J. Sylva Lestari

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This study aimed to evaluate the physical and mechanical properties of cross-laminated timber (CLT) characteristics from mangium (Acacia mangium) and puspa (Schima wallichii) woods and their combination using polyurethane (PU 1.2) adhesives. The manufacture of CLT began with basic adhesive characterization and thermo-mechanical analysis. Wood material’s physical and chemical properties were also tested with its response to the PU 1.2 wettability. The CLT (100 ´ 30 ´ 3.60) cm3 was manufactured with 160 g/m2 glue spread at a pressure of 0.80 MPa for 200 minutes. The CLT panels were characterized refers to the JAS 3079 standard. The results show that PU 1.2 had a gelatination time of 182.1 minutes at 25°C, was able to form urethane groups, and experienced an increase in storage modulus at 35°C. Mangium and puspa woods have different physical and chemical properties, but they interact similarly with PU 1.2 wettability. Puspa CLT panel has a higher density than mangium but lower dimensional stability. The bending mechanical properties of hybrid puspa-mangium-puspa CLT were able to match puspa CLT and have one sample of shear strength that met the JAS 3079 standard in both grain directions. Therefore, hybrid puspa-mangium-puspa CLT has the potential to be developed to improve its dimensional stability and mechanical properties. Keywords: Acacia mangium, cross-laminated timber, layer combination, polyurethane adhesive, Schima wallichii

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Section: Physical Properties Of Cltmentioning

confidence: 97%

Physical and Mechanical Properties of Cross-Laminated Timber Made of a Combination of Mangium-Puspa Wood and Polyurethane Adhesive

Hariz

Hadi

Maulana³

et al. 2023

J. Sylva Lestari

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show abstract

“…The influence from rolling shear properties of transverse layers on the shear strength of CLT, stress analysis was conducted using the shear analogy method. Pang et al [37] analyzed swelling (S w ) and shrinkage (S h ) behaviors of CLT made of different species and various layer thickness and combinations. Compared to S w and S h of CLT made of larch, S w and S h of CLT made of pine showed lower values.…”

Section: Research Progress Of Hybrid Cltmentioning

confidence: 99%

Cross-Laminated Timber: A Review on Its Characteristics and an Introduction to Chinese Practices

Wang¹,

Yin²

2022

Engineered Wood Products for Construction

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Cross-laminated timber (CLT) is a popular engineering wood product in recent years. It has some characteristics of configuration and mechanical properties, which makes it an excellent building material for floor, roof and other places. In Europe and North America, lots of middle and high-rise buildings have adopted CLT as their main structural component. CLT has recently been used to construct public buildings in China. As a building material, the lower rolling shear properties of CLT has always been a concern. To overcome this shortcoming of CLT, the structural composite lumber and bamboo have been employed to develop hybrid CLT. This chapter also presents the latest development and advances of CLT in China.

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“…Indeed, multiple studies investigated the climate-induced impacts of moisture movement in laminated wood, and showed that it will have consequential effects on the long-term sustainability of mass timber construction (Autengruber et al, 2020;Pang and Jeong, 2020;Chiniforush et al, 2019). Thus modeling the diffusion of humidity through laminated wood is critical to predicating the long-term behavior in these structures and ensuring sustainable implementation of carbon sequestering construction materials.…”

Section: Moisture Effects In Woodmentioning

confidence: 99%

Orthotropic Hygroscopic Behavior of Mass Timber: Theory, Computation, and Experimental Validation

Tong¹,

Brown²,

Yin³

et al. 2022

Preprint

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Recent rapid improvements in laminated timber technology has led to the increased use of of wood in both mid- and high-rise construction, generally posed as a more carbon friendly alternative to concrete. However, wood is significantly more sensitive to changes in relative humidity than concrete, which may impact the sustainability and durability of mass timber buildings. Moisture cycling in particular affects not only shrinkage and swelling but also strongly influences wood creep. This sensitivity is of high concern for engineered wood used in mass timber buildings. At the same time, wood, considered as an orthotropic material, exhibits varying diffusivity in all three directions, complicating efforts to characterize its behavior. In this work, an orthotropic hygroscopic model was developed for use in laminated timber. A species database for wood sorption isotherm was created and an existing model was used to fit species-based parameters. Diffusion behavior which considers the sorption isotherm was modeled through numerical simulations, and species-dependent orthotropic diffusion parameters were identified. A database of permeability in all directions for various species was created. The resulting model is able to predict diffusion behavior in glulam and cross laminated timber (CLT) for multiple species of the lab tests. The model also predicts the moisture ranges for a CLT panel under environmental change with parameters from these sorption isotherm and diffusion databases.

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Swelling and shrinkage behaviors of cross-laminated timber made of different species with various lamina thickness and combinations

Cited by 20 publications

References 10 publications

Physical and Mechanical Properties of Cross-Laminated Timber Made of a Combination of Mangium-Puspa Wood and Polyurethane Adhesive

Physical and Mechanical Properties of Cross-Laminated Timber Made of a Combination of Mangium-Puspa Wood and Polyurethane Adhesive

Cross-Laminated Timber: A Review on Its Characteristics and an Introduction to Chinese Practices

Orthotropic Hygroscopic Behavior of Mass Timber: Theory, Computation, and Experimental Validation

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