Assessment of durability of environmentally friendly wood-based panels

Kallavus, Urve; Järv, Hele; Kalamees, Targo; Kurik, Lembit

doi:10.1016/j.egypro.2017.09.756

Cited by 10 publications

(4 citation statements)

References 7 publications

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“…The main mould genera detected were Aspergillus, Penicillium, Cladosporium, Aureobasidium, Phoma and Chaetomium, most of which are fungi indicating a moisture problem (Mahooti-Brooks et al, 2010). OSB has been shown by laboratory measurements to be a very favourable surface for mould growth (Kallavus et al, 2017) and therefore requires especially careful handling during construction to prevent its wetting.…”

Section: Mould and Moisture Damagesmentioning

confidence: 99%

Moisture Safety in Prefabricated Roof Renovations: Causes and Strategies

Kodi,

Kalbe,

Kalamees

2024

sace

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Achieving carbon neutrality by 2050 requires extensive energy renovation of the existing building stock. In this study we focus on deep renovation with prefabricated insulation elements as a potential solution to attain the required renovation speed and volume. The use of such elements without a proper moisture safety strategy can, however, lead to moisture-related problems, including mould growth. Here we examine the causes of moisture and mould damage in a case study of a building that has been renovated to near-zero energy standards using prefabricated insulation elements. The study elucidates the reasons for the moisture damages detected and proposes two moisture safety strategies to improve the situation. The first strategy emphasizes the importance of ensuring dry construction conditions by either using a full temporary roof or avoiding rainfall during installation. The second strategy addresses localized water damage to the attic floor and involves the use of protective measures, active ventilation and a correct installation sequence. In the case of local moisture damage, the required amount of ventilation air flow during summer is 0.5–0.55 l/(s·m²). During cooler periods, heating is needed. The employed methods include modelling the case-study building with the IDA Indoor Climate and Energy software, as well as mould growth risk assessment based on temperature and relative humidity measurements. The results highlight the effectiveness of both strategies in preventing mould growth if applied correctly, and emphasize the need for thorough planning, moisture safety regulations and rapid response to ensure successful renovation with prefabricated insulation units. The study provides valuable information on moisture safety strategies for serial renovations with prefabricated elements. The existence and proper implementation of a moisture safety strategy is important for achieving the desired energy performance goals while maintaining building durability and occupant health, and it needs to be applied throughout the chain of site management: from the main contractor down to the skilled worker.

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Section: Mould and Moisture Damagesmentioning

confidence: 99%

Moisture Safety in Prefabricated Roof Renovations: Causes and Strategies

Kodi,

Kalbe,

Kalamees

2024

sace

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“…In addition, compared to conventional materials used in civil construction, WCBs, as they contain biodegradable particles, can be considered sustainable composites, since the wood come from certified forests subjected to sustainable management [39]. By using them, the addition of petroleum-based fibers is reduced, the use of asbestos, cement consumption is reduced and agribusiness and timber residues are used [2,15,22,35].…”

Section: Introductionmentioning

confidence: 99%

Cement boards reinforced with wood sawdust: an option for sustainable construction

et al. 2020

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Ochroma pyramidale is a fast-growing forest species with low-density wood. The present study had the goal to assess the effect of extractive removal on the performance of the species for producing wood-cement boards (WCB). Wood particles were submitted to three types of treatment for extractives removal: cold water, hot water and sodium hydroxide (NaOH). An entirely randomized design with four treatments was established, respectively, T1-control treatment, T2-cold water, T3-hot water and T4-NaOH, with 4 replicates (boards) per experimental treatment, to assess the effect of extractives removal on the boards' physical and mechanical properties. Wood/cement ratio = 1:5, water/cement ratio = 1:2 and 4% CaCl 2 as additive based on dry mass of cement were used. The following WCB properties were evaluated: density, compaction ratio; water absorption and thickness swelling after 2, 24 and 72 h of water immersion; and mechanical strength during static bending (moduli of elasticity and rupture). The results showed there was no need for wood particle treatment, since no improvement of the boards' physical-mechanical properties was achieved by previous application of cold or hot water or NaOH on the particles. Water absorption and thickness swelling were lower than the levels reported in the literature and minimum values specified by WCB factories. Despite having weaker mechanical properties than those required for structural uses, wood from Ochroma pyramidale can be employed in the production of boards designed for use in moist environments but not having structural importance, such as for partitions, walls, tile flooring and exterior siding.

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“…Environmentally friendly WBP products are those whose ingredients are considered to have low negative impacts on human health or panels manufactured from natural sources. 1 The surface attraction of WBPs could be achieved by the use of natural and synthetic adhesives. WBPs are used for the internal wall partitioning, roofing, ceilings, and furniture in various locations (such as schools, exhibition halls, theaters, airports, hospitals, hotels, etc.).…”

Section: ■ Introductionmentioning

confidence: 99%

“…Wood-based panels (WBPs) are gaining tremendous global interest due to their eco-friendly nature and ease of application in service among other numerous benefits, e.g., low cost, renewable sustainability, biodegradability, etc. Environmentally friendly WBP products are those whose ingredients are considered to have low negative impacts on human health or panels manufactured from natural sources . The surface attraction of WBPs could be achieved by the use of natural and synthetic adhesives.…”

Section: Introductionmentioning

confidence: 99%

Facile Approach for Glutaraldehyde Cross-Linking of PVA/Aluminophosphate Adhesives for Wood-Based Panels

Aladejana

et al. 2019

ACS Sustainable Chem. Eng.

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The application of aluminophosphate adhesives in wood-based panel industries is limited by the adhesives' inherent disadvantage of poor water resistance caused by their mesoporous nature. In this study, poly(vinyl alcohol) was used as the modifier while glutaraldehye was employed as the crosslinker to reduce the water-uptake of the aluminophosphate bond interface in Pinus massoniana plywood. The influence of the cross-linking on the reaction mechanism, morphology, thermal stability of the adhesives, and tensile strength of the plywood was examined using FTIR, XRD, XPS, TGA, and SEM analyses. The SEM images showed the absence of pores on the adhesive surface at 1, 3, and 5% glutaraldehyde. Crystalline peaks were observed in aluminophosphate adhesives at a lower reaction temperature (110 °C). The C−O bonds were reduced, leading to the increase in C−C/C−H that could account for the bond stability in water after revealing hydrogen bonding between the plywood interfaces. Consequently, the wet tensile strength of PVA/aluminophosphate-based plywood was enhanced significantly (P < 0.05) above the type II Chinese standard, achieving a strength as high as 1.02 MPa. Also, the dry tensile strength improved slightly to 2.34 MPa compared to unmodified aluminophosphate adhesive. Therefore, modification with PVA and the addition of glutaraldehyde as a cross-linker could enhance the water stability of aluminophosphate-based plywood. This research has demonstrated the potential improvement of the plywood bondline and the industrial utilization of formaldehyde-free aluminophosphate adhesive for the wood-based panels.

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Assessment of durability of environmentally friendly wood-based panels

Cited by 10 publications

References 7 publications

Moisture Safety in Prefabricated Roof Renovations: Causes and Strategies

Moisture Safety in Prefabricated Roof Renovations: Causes and Strategies

Cement boards reinforced with wood sawdust: an option for sustainable construction

Facile Approach for Glutaraldehyde Cross-Linking of PVA/Aluminophosphate Adhesives for Wood-Based Panels

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