Influence of wood moisture content on the hardened state properties of geopolymer wood composites

Asante, Bright; Ye, Hanzhou; Nopens, Martin; Schmidt, Goran; Krause, Andreas

doi:10.1016/j.compositesa.2021.106680

Cited by 20 publications

(4 citation statements)

References 46 publications

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“…The number and length of particular periods of sample soaking in water are presented in Figure 1. state, where the wood moisture is below 20% [7], and a wet protective state with a wood moisture above 80% [8]. Moisture loss results in shrinkage and swelling.…”

Section: Methodsmentioning

confidence: 99%

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Effect of Seawater with Average Salinity on the Moisture Content, Ash Content and Tensile Strength of Some Coniferous Wood

et al. 2023

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In this paper, the differences in mechanical strength tested during the static tensile and compression test of Scots pine (Pinus sylvestris L.), European larch (Larix decidua) and Norway spruce (Picea abies) wood exposed to continuous soaking in water with a salinity of 7‰ were determined. The value of salinity corresponded to the average salinity on the Polish Baltic coast. This paper also aimed to examine the content of mineral compounds absorbed during four cycles of two weeks each. The essence of the statistical research was to identify the effect of the mineral range compounds and salts depending on the mechanical strength of the wood. Based on the results of the experiments, it can be concluded that the medium used has a specific effect on the wood species’ structure. The effects of soaking on the wood parameters depend obviously on the type of wood. A tensile strength test of pine, as well as the tensile strength other species, was enhanced by incubating it in seawater. A native sample’s initial mean tensile strength was 82.5 MPa, which increased to 94.8 MPa in the last cycle. It was found that the larch wood had the lowest tensile strength difference (9 MPa) of the woods studied in the current study. Four to six weeks of soaking was necessary to notice an increase in tensile strength.

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Section: Methodsmentioning

confidence: 99%

“…Moisture results in wood shrinkage or swelling. We can differentiate between two states of wood protection: a dry protective state, where the wood moisture is below 20% [7], and a wet protective state with a wood moisture above 80% [8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Seawater with Average Salinity on the Moisture Content, Ash Content and Tensile Strength of Some Coniferous Wood

et al. 2023

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“…Table 3 lists the absorbance ratios of the modified poplar wood samples. Wood is mainly composed of cellulose, hemicellulose, and lignin [44]. The peak height ratio of the characteristic absorption peaks of lignin to cellulose, hemicellulose and carbohydrates can be used to determine the relative lignin content [45].…”

Section: Ftir Analysismentioning

confidence: 99%

A Primary Study on Mechanical Properties of Heat-Treated Wood via in-situ Synthesis of Calcium Carbonate

Liang¹,

Ding²,

Yan³

et al. 2023

Journal of Renewable Materials

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This study aims to improve the value of fast-growing wood and extend the heat-treated wood utilization using inorganic calcium carbonate (CaCO 3 ) crystals via an in-situ synthesis method. CaCl 2 and Na 2 CO 3 solutions with a concentration ratio of 1:1 were successively introduced into the thermally modified poplar wood obtained by steam heat treatment (HT) at 200°C for 1.5 and 3 h, resulting in the in-situ synthesis of CaCO 3 crystals inside the heat-treated wood. The filling effect was best at the concentration of 1.2 mol/L. CaCO 3 was uniformly distributed in the cell cavities of the heat-treated wood, and some of the crystals were embedded in the fissures of the wood cell walls. The morphology of CaCO 3 crystals was mainly spherical and rhombic polyhedral. Three main types of CaCO 3 crystals were calcite, vaterite, and aragonite. The HT of poplar wood at 200°C resulted in degrading the chemical components of the wood cell wall. This degradation led to reduced wood mechanical properties, including the surface hardness (HD), modulus of rupture (MOR), and modulus of elasticity (MOE). After CaCO 3 was in-situ synthesized in the heat-treated wood, the HD increased by 18.36% and 16.35%, and MOR increased by 14.64% and 8.89%, respectively. Because of the CaCO 3 synthesization, the char residue of the 200°C heat-treated wood samples increased by 9.31% and the maximum weight loss rate decreased by 19.80%, indicating that the filling with CaCO 3 cannot only improve the mechanical properties of the heat-treated wood but also effectively enhance its thermal stability.

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“…Although direct comparison was not possible due to the differences in binders, wood species, wood treatment methods, water-cement ratios, mixing, curing, and testing methods used in different studies, a general assessment of the performance of ambiently cured WGC could be made by comparing its results to the results from the available literature. Accordingly, the compressive strength data from different studies [13,16,36,38,[45][46][47][48][49][50] were collected and plotted based on varying WC/B ratios, and the results displayed significant variability or scatter. A curve was fitted to the collected data to provide a generalised comparison, as shown in Fig.…”

Section: Effect Of Wood Decontamination On the Mechanical Propertymentioning

confidence: 99%

Recycling Timber Waste into Geopolymer Cement Bonded Wood Composites

Khennane¹,

Gigar²,

Liow³

et al. 2023

Preprint

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Influence of wood moisture content on the hardened state properties of geopolymer wood composites

Cited by 20 publications

References 46 publications

Effect of Seawater with Average Salinity on the Moisture Content, Ash Content and Tensile Strength of Some Coniferous Wood

Effect of Seawater with Average Salinity on the Moisture Content, Ash Content and Tensile Strength of Some Coniferous Wood

A Primary Study on Mechanical Properties of Heat-Treated Wood via in-situ Synthesis of Calcium Carbonate

Recycling Timber Waste into Geopolymer Cement Bonded Wood Composites

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