Mechanical properties of wood-geopolymer composite

Bērziņš, A.; Morozovs, Andris; Gross, U.; Iejavs, J.

doi:10.22616/erdev2017.16.n251

Cited by 14 publications

(5 citation statements)

References 9 publications

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“…Some studies investigated the thermal conductivity of modular building envelope panels. Lightweight cellular wood material (CWM) [25] envelope panels decreased building envelope thermal conductivity between 0.148 and 0.0977 W.m −1 K −1 , i.e., 34% better than the reference specimen. The study optimized expanded polystyrene-reinforced concrete (EPS-RC) precast-bearing walls by adding recycled EPS particles to the mixtures.…”

Section: Future Directionsmentioning

confidence: 99%

Thermo-Environmental Performance of Modular Building Envelope Panel Technologies: A Focused Review

Mohammed,

Budaiwi,

Al-Osta

et al. 2024

Buildings

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Modular construction is becoming famous for buildings because it allows a high degree of prefabrication, with individual modules easily transported and installed. Building envelope optimization is vital as it protects buildings from undesirable external environments by expressly preventing the incursion of outside elements. This research uses a systematic literature review to appraise the characteristics of modular envelope panels, focusing on hygrothermal and energy performance. A total of 265 articles were subjected to rigorous filtering and screening measures. The findings reveal notable inconsistencies in modular envelope terminologies and a lack of consistent performance measures, which present significant challenges for research and development efforts. Furthermore, the results indicate a predominant focus on hygrothermal and energy performance in existing studies, with limited attention to environmental impacts and other performance factors. Moreover, the existing literature primarily addresses modular envelope solutions in temperate climates, offering inadequate information for hot and hot–humid climate contexts. To address these gaps, this study proposes categorizing modular envelope panels into four distinct categories: active, passive, smart, and green/vegetated wall panels. These findings will benefit researchers, architects, building envelope designers, policymakers, and organizations developing building performance-related assessment ratings, standards, and codes. The study suggests adopting the categorization of modular envelope panels provided in this study and developing modular panels suitable for hot and humid climates to fill the existing knowledge gap.

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Section: Future Directionsmentioning

confidence: 99%

Thermo-Environmental Performance of Modular Building Envelope Panel Technologies: A Focused Review

Mohammed,

Budaiwi,

Al-Osta

et al. 2024

Buildings

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“…If the foamed geopolymer paste is used, the plant origin aggregate should be added to the geopolymer paste immediately after the foaming agent is mixed with the paste [54]. For wood chips or other small-sized bio-fillers, spraying with a geopolymer paste during bio-filler mixing is preferred to decrease adhesive substance consumption and ensure a smooth particle deposition [65]. The most common methods employed for starch-based bio-composite manufacturing are extrusion [66,67], injection molding, hot pressing [54,68], hot-pressing [67], compaction at load [55,69,70], and further curing at temperatures from 120 • C to 180 • C [48,53,69,71,72].…”

Section: Specimen Manufacturementioning

confidence: 99%

Gypsum, Geopolymers, and Starch—Alternative Binders for Bio-Based Building Materials: A Review and Life-Cycle Assessment

et al. 2020

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To decrease the environmental impact of the construction industry, energy-efficient insulation materials with low embodied production energy are needed. Lime-hemp concrete is traditionally recognized as such a material; however, the drawbacks of this type of material are associated with low strength gain, high initial moisture content, and limited application. Therefore, this review article discusses alternatives to lime-hemp concrete that would achieve similar thermal properties with an equivalent or lower environmental impact. Binders such as gypsum, geopolymers, and starch are proposed as alternatives, due to their performance and low environmental impact, and available research is summarized and discussed in this paper. The summarized results show that low-density thermal insulation bio-composites with a density of 200–400 kg/m3 and thermal conductivity (λ) of 0.06–0.09 W/(m × K) can be obtained with gypsum and geopolymer binders. However, by using a starch binder it is possible to produce ecological building materials with a density of approximately 100 kg/m3 and thermal conductivity (λ) as low as 0.04 W/(m × K). In addition, a preliminary life cycle assessment was carried out to evaluate the environmental impact of reviewed bio-composites. The results indicate that such bio-composites have a low environmental impact, similar to lime-hemp concrete.

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“…In works [5,6] attention is paid to the physical and mechanical characteristics of composite board materials obtained on the basis of aluminosilicate adhesives, as well as similar materials with increased resistance to fire [7].…”

Section: Problem Descriptionmentioning

confidence: 99%

STUDY OF THE INFLUENCE OF COMPOUNDS OF THE ANO3 and ANO3 nH2O TYPES ON RHEOKINETIC AND COLLOID-CHEMICAL PROPERTIES OF ALUMINOSILICATE ADHESIVES FOR WOOD

Guzii¹,

Bazhelka²,

Lashchivskyi³

2020

ScienceRise

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In the technology of gluing solid wood, various adhesives are used, which, in addition to ensuring the strength of the gluing, must also be characterized by a number of rheological and colloidal-chemical properties, namely: have acceptable viscosity, low contact angles, have good spreading and enveloping ability, penetrate deep into the wood , providing reliable cohesive-adhesive contact and much more. Today, adhesives based on PVA dispersions and urea formaldehydes are used, the properties of which have been sufficiently studied and tested in practice. An alternative to organic-based adhesives is mineral adhesives, in particular aluminosilicate adhesives, which are non-flammable and have high mechanical strength. Object of research: rheokinetic patterns and processes of formation of colloidal-chemical structures of aluminosilicate adhesives modified with compounds of the ANO3 and ANO3×nH2O type. Investigated problem: Considering that aluminosilicate adhesives are multiphase reactive suspensions, the viscosity of which changes over time and affects their viability, the issue of viscosity stabilization due to the introduction of electrolyte salts into their composition is relevant, and will also contribute to improving the wettability and spreading of the adhesive during applying them to substrates and gluing samples from various types of wood. Main scientific results: The effect of the concentrations of compounds of the ANO3 and ANO3×nH2O type on the rheokinetic and chemical-colloidal properties of the aluminosilicate adhesive has been established, which will make it possible to use aluminosilicate adhesives in practice for gluing wood of various species, as well as to work out possible technological methods of their application, taking into account the obtained data on the viscosity, wetting and spreadability of the modified adhesive on the surface of the wood substrate. Area of practical use of the research results: woodworking enterprises for the production of glued solid wood products. Innovative technological product: aluminosilicate adhesives modified with ANO3 and ANO3×nH2O nitrate additives for gluing wood of various species. Scope of application of an innovative technological product: the application of these approaches will make it possible to obtain glued materials from wood from different species with improved technological and physical and mechanical properties of the glue seam and, accordingly, to increase the quality and reliability of products.

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Mechanical properties of wood-geopolymer composite

Cited by 14 publications

References 9 publications

Thermo-Environmental Performance of Modular Building Envelope Panel Technologies: A Focused Review

Thermo-Environmental Performance of Modular Building Envelope Panel Technologies: A Focused Review

Gypsum, Geopolymers, and Starch—Alternative Binders for Bio-Based Building Materials: A Review and Life-Cycle Assessment

STUDY OF THE INFLUENCE OF COMPOUNDS OF THE ANO3 and ANO3 nH2O TYPES ON RHEOKINETIC AND COLLOID-CHEMICAL PROPERTIES OF ALUMINOSILICATE ADHESIVES FOR WOOD

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