Wood-Cement Composites from Wastes of Pinus Sp. Wood: Effect of Particles Treatment

Bertolini, Marília da Silva; Campos, Cristiane Inácio de; Souza, Amós Magalhães de; Panzera, Túlio Hallak; Christofóro, André Luis; Lahr, Francisco Antônio Rocco

doi:10.5923/j.cmaterials.20140402.14

Cited by 10 publications

(5 citation statements)

References 9 publications

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“…Since wood fibres of both hardwood and softwood species are an abundant, lightweight, low-cost and less energy-intensive alternative to synthetic fibres, they are becoming more and more popular in the fibre-cement building product market [5]. In particular, incorporating wood fibres into mortars could provide good indoor air quality (since they act as moisture-buffering materials), good thermal insulation and acoustic absorbency [1,[6][7][8]. Flexural strength, fracture toughness and dimensional stability all tend to improve with an increase in wood fibre length and a decrease in fibre diameter for a range of fibre contents [9].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Hydrothermally Treated Wood Fibre Performance in Cement Mortars

Kampragkou,

Kamperidou,

Stefanidou

2024

Fibers

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Biofibres’ wide application in mortar enhancement has thus far been restricted by factors related to their chemical composition and hygroscopic nature. Their hydrophilic behaviour increases the water demand of mortar mixtures and diminishes their affinity to the matrix, while further moisture-related fibre degradation issues may arise. Additionally, natural fibres seem to be susceptible to degradation caused by exposure to alkaline environmental conditions such as those experienced by cement mortars, restricting their utilisation in the construction industry. Therefore, the current study investigates the potential of fibre modification through treatments that would permanently alter their structure and chemical composition to improve their performance. In this study, wood fibres of black pine and beech species were exposed to mild thermal treatment (140 °C 2 h, under a steam atmosphere), characterised in terms of the physical and chemical properties and incorporated in cement mortars, applying the proportion of 1.5% v/v in the mortar, in order to assess their performance as reinforcement material. The mortars’ workability (at a fresh state) was examined, as well as other physical, hygroscopic, thermal, and mechanical characteristics of the mortars at the ages of 28, 90 and 365 days and weathering performance, by subjecting them to different artificial ageing environments (freeze–thaw cycles or outdoor exposure). The results revealed the beneficial role of the treated fibres in dimensional stability, flexural strength, thermal insulation properties and capillary absorption of the mortar specimens, especially during the ageing process, with the black pine fibres showing the greatest improvement. The hydrothermally treated wood fibres seem to help maintain the integrity of cement mortars under all ageing conditions, proving that they could provide low-cost and eco-friendly mortar enhancement pathways.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Hydrothermally Treated Wood Fibre Performance in Cement Mortars

Kampragkou,

Kamperidou,

Stefanidou

2024

Fibers

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“…Especially the fibres of wood material constitute a low-cost, biodegradable, non-hazardous, renewable, readily available, and lightweight alternative to synthetic fibres. Specifically, wood fibres incorporated in mortars could provide good indoor air quality (balancing the relative humidity), good thermal insulation and acoustical absorbency [7,8].…”

Section: Introductionmentioning

confidence: 99%

Wood fibres as additives in mortars: a sustainable reinforcement

Stefanidou

Kampragkou

Kamperidou

2023

IOP Conf. Ser.: Earth Environ. Sci.

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In mortars, the use of fibres has been diachronically a commonly used technique. In Ancient Greece, wood and straw fibres were particularly used to increase volume stability in clay and lime mortars. Overtime, with the evolution of technology, natural fibres were replaced by modern materials like polypropylene, steel, glass and carbon fibres. Recently, the climate change and the strong demand for independence from non-renewable mineral resources have urged the search for alternative ways to utilize bio-materials to produce innovative, high value-added products. The wood waste material, coming from loggings or trunks mechanical processing, constitutes valuable bio-degradable, non-toxic material of low environmental impact that could be utilized as reinforcements to produce advanced wood polymer composites. In the current study, fibres of two widely available wood species (black pine and beech) have been used (1-2 cm length). The fibres were added in lime-based and cement-based mortars in proportion 1.5% v/v of the mortar. Physical, thermal and mechanical properties were tested at the age of 28 and 90 days, while at fresh state, workability of the mixtures was recorded. It was found that in traditional systems, the formulations with black pine required higher amount of water for the same workability probably due to the higher hygroscopicity of the fibres. This was not the case in cement-based systems. Small reduction of the mechanical properties was recorded, as well as an increase of the water capillary absorption of the bio-fibres reinforced samples. Thermal conductivity was improved probably due to the porosity increase. In all cases, the shape of the samples was retained even after fracture and crack formation. Between the two wood species used, the black pine gave more beneficiary results. In general, wood-fibres revealed a high potential to upgrade the lime- and cement-based mortars performance and be further promoted in the construction sector.

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“…The wood cement composite has properties for use in construction, for applications in form of sealing blocks, slabs, slab and mortar fillers (Pimentel et al 2006;Moslemi 1999), and as an alternative to replacement of asbestos fibers (Ashori et al 2011;Bertolini et al 2014;Silva et al 2016Silva et al , 2019.…”

Section: Introductionmentioning

confidence: 99%

Influence of Indian cedar particle pretreatments on cement-wood composite properties

Oliveira

Silva

Bianchi

et al. 2020

BioRes

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This work physically, mechanically, and chemically characterized the composites produced from Portland CP II-E32 cement and fresh Indian cedar wood particles previously treated by immersion in hot and cold water. Density values for wood particulate composites were around 50% lower compared with the wood-free control treatment, from 0.88 to 1.78 g/cm³. A larger swelling was observed for the composite material. The results of compressive strength and stiffness indicated that there is no need for particle treatment for composite production. Hot and cold water immersion treatments reduced the total Indian cedar wood extractives by 33% and 42%, respectively. Optical microscopy analysis was used to identify adhesion failures between the cement/wood interface of the composite produced with fresh particles, which presented a higher percentage of extractives. This result indicated that the greater concentration of total extractives partially inhibits the matrix-matrix interaction reinforcement. Despite the reduction in total extractives caused by the treatments, this process is not necessary for the composite production because there is no statistical difference between the treatments. The values obtained for the composite indicate the possibility of application in sealing blocks in light construction systems.

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Wood-Cement Composites from Wastes of Pinus Sp. Wood: Effect of Particles Treatment

Cited by 10 publications

References 9 publications

Evaluation of Hydrothermally Treated Wood Fibre Performance in Cement Mortars

Evaluation of Hydrothermally Treated Wood Fibre Performance in Cement Mortars

Wood fibres as additives in mortars: a sustainable reinforcement

Influence of Indian cedar particle pretreatments on cement-wood composite properties

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