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Potential for the design of an energy saving facade system using agglomerated cork: Implications in subtropical climates
Published in Konstantinos Papadikis, Chee S. Chin, Isaac Galobardes, Guobin Gong, Fangyu Guo, Sustainable Buildings and Structures: Building a Sustainable Tomorrow, 2019
A computational method will be used to examine overheating risk and energy consumption of buildings under such conditions for a more sustainable building design. The study will provide a parametric method to identify and quantify critical design features so that specific guidelines can be developed for retrofitting the building envelope (exterior surfaces and roof). The parametric method will take in consideration a layer of cork as the building envelope. Cork is a raw vegetable material, biodegradable and totally recyclable. It is durable, water resistant, water tight, presents very low thermal conductivity and its chemical structure makes it a CO2 fixer (Dent & Sherr 2014), some of the properties that may qualify it as adaptable to subtropical climatic conditions. At the same time, the cork oak is a Chinese native species and cork has been harvested and cork agglomerates produced commercially in China for decades, which make the project feasible in this region (Brach & Song 2006).
Insulation materials
Published in Arthur Lyons, Materials for Architects and Builders, 2019
Cork is harvested from the cork oak (Quercus suber L.) on a nine-year (or more) cycle, and is therefore considered to be an environmentally friendly material (Fig. 13.2). For conversion into boards, typically used for roof insulation, cork granules are expanded, then formed under heat and pressure into blocks using the natural resin within the cork. The blocks are trimmed to standard thicknesses or to a taper to produce falls for flat roofs (Fig. 13.3). For increased thermal insulation properties, the cork may be bonded to closed-cell polyurethane or polyisocyanurate foam. In this case, the laminate should be laid with the cork uppermost. Cork products are unaffected by the application of hot bitumen in flat roofing systems. Insulation cork board (ICB) is described in BS EN 13170: 2012 + A1: 2015. (The thermal conductivity of cork board is typically 0.042 W/mK at a density of 120 kg/m3, but some denser products have higher thermal conductivity.)
Selection of Natural Materials Using CES EduPack
Published in Graham A. Ormondroyd, Angela F. Morris, Designing with Natural Materials, 2018
Supporting information is provided indicating typical uses of cork including corks, floats, flooring, insulation and footwear. At level 3, six varieties of cork are described including high- and low-density cork and corkboard with specific gravities of 0.12, 0.16, 0.2 and 0.25. As well as the properties listed above at level 1, there is considerably more property information provided exemplified by data for corkboard with a specific gravity of 0.12 as follows:
Green fabrication of biodegradable cork membrane for switchable separation of oil/water mixtures
Published in Journal of Dispersion Science and Technology, 2021
Yanbiao Zhou, Kaige Qu, Lihui Zhang, Xiaoqiang Luo, Binghua Liao
Cork is a renewable material that is isolated from the mature bark of cork tree. Its vast vascular network transports nutrients from roots to leaves in the living tree. After cork was stripped from living cork tree, the main tracheidal structure and chemical composition are preserved. It has desirable properties as a precursor due to its aligned tracheids (cells) and amphiphilic (hydrophilic and oleophilic) composition, such as hydrophilic hydroxyls and oleophilic alkyl chains in suberin, lignin, polysaccharides and extractives. These features confer it with many unique properties such as high porosity and low permeability, which has been used to fabricate sealing, floating, acoustic, insulating, adsorbing and surfacing products. Hence, we chose cork as the separating membrane substrate to extend the range of practical applications for plant materials.[18,19]
Effect of reinforcements at different scales on mechanical properties of epoxy adhesives and adhesive joints: a review
Published in The Journal of Adhesion, 2018
Ali Nemati Giv, Majid R. Ayatollahi, S. Hengameh Ghaffari, Lucas F.M. da Silva
Ever green oak produces cork that flourishes in particular areas of the Western Mediterranean countries (Portugal, Spain, Southern France, part of Italy and North Africa). Cork is a biological material with an alveolar structure which is similar to a honeycomb with prismatic cells without intercellular distance (see Figure 3). Cork wall cells are formed by five layers including, cellulose, lignin, suberin, tannins and waxes. The size of cells depends on the season that they have been produced and its range is between 10–40 μm. Spring cells are bigger and their walls are thinner than autumn cells.[21] Cork is very light, very versatile, elastic[71], innocuous, unaffected by microbial activity[72], flexible, considerably impermeable to liquids and gases and also is a good electric, thermal, acoustic and vibration insulator.[71] Owing to the unique properties of cork, it had vast applications, such as in aeronautical and automobile industries, oil spills and also it can be used as reinforcement for improving fracture toughness of brittle resins.[72]
Enhancement of Novolac aerogel nanostructure and cellulose cork on thermal performance and ablation properties of lightweight heat shields: with regard to omission of thermal convection
Published in Experimental Heat Transfer, 2020
Golnoosh Abdeali, Faranak Samani, Hamidreza Hadizadeh- Raiesi, Ahmad Reza Bahramian
Cork is a kind of natural, renewable, heat insulator, and lightweight cellulosic material that has cellular structure with micron-size porous media which is filled by air and has distinct microscopic properties such as low-thermal conductivity, high-energy absorption, low density, and remarkable fire resistance. Its structure is formed by hollow polyhedral prismatic cells, which have a honeycomb and rectangular pattern and also resembling a brick wall from transversal directions [1,2]. Cellulose cork-based composites are valuable for the sake of high flexibility, stability, compressive strength, and soundproofing properties.