Panel apit kayu yang akan digunakan dalam bidang pembinaan adalah produk mesra alam yang boleh mempunyai sifat-sifat penebat dan ciri-ciri struktur yang mencukupi. Ciri-ciri ini seperti lapisan telap untuk penebat haba dan rintangan kelembapan membolehkan lebih penjimatan tenaga. Walau bagaimanapun, panel apit kayu belum dikomersialkan di Malaysia terutamanya untuk tujuan struktur kerana kurang pemahaman dan maklumat terhad atau pengetahuan tentang prestasi struktur. Kajian ini akan meluaskan pengetahuan tentang panel apit kayu dalam prestasi struktur dan meningkatkan kepelbagaian produk dalam pembinaan kayu. Prestasi struktur panel apit kayu yang mengandungi 3 lapisan dikaji melalui ujian mampatan dengan jalan italik dan ujian lenturan. Corak kegagalan dikaji semasa kajian ini, lengkokan dan kegagalan ikatan antara kayu dengan polistirena didapati dalam ujian mampatan dengan jalan italik. Ujian lenturan menggunakan 4 mata lentur didapati lebih baik kerana ia tidak mengalami pengaruh ricih dan dengan itu membenarkan penilaian langsung kekukuhan lenturan. Parameter untuk prestasi struktur dalam kajian ini termasuk kekuatan mampatan muktamad, tekanan lapisan kayu muktamad, kord modulus lapisan kayu efektif dan kekukuhan lenturan. Ia menunjukkan bahawa tekanan lapisan kayu muktamad menurun secara terus dengan ketebalan polistirena manakala kekuatan mampatan muktamad menurun secara terus dengan ketebalan polistirena. Ketebalan polistirena efektif bergantung kepada kegunaannya dalam industri pembinaan seperti untuk tujuan dinding atau sebagai panel bumbung. Lebih besar ketebalan polistirena akan memberikan lebih tinggi kekuatan mampatan dan lebih sesuai untuk dinding. Manakala lebih kecil ketebalan polistirena, semakin tinggi kekukuhan lenturan, lebih sesuai sebagai panel bumbung.
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A sandwich wood panel to be used in the construction field should be more eco-friendly product has insulating properties and sufficient structural properties. Such desirable features as impermeable facings for thermal insulation and moisture barriers result in more energy savings. However, Sandwich wood panel has not been commercialised in Malaysia especially for structural purposes due to poor understanding and limited information or knowledge on its structural performance. This study will extent the understanding on sandwich wood panel in its structural performance and increases the diversity of products in the wood construction. Structural performance of sandwich wood panel involving 3-layer was studied through edgewise compressive strength and flexural stiffness. Modes of failure were studied during this research, general buckling and core-to-facing bond failure were noticed in edgewise compression test. Flexural test using 4-point bending showed better result as it does not suffer from influence of shear and thus permits direct evaluation of flexural stiffness. Parameters for structural performance in this study included ultimate edgewise compressive stress, facing ultimate stress, and effective facing chord modulus and sandwich flexural stiffness. It showed that facings ultimate stress decreased linearly with increasing core thickness whereas ultimate edgewise compressive stresses decrease linearly with increasing core thickness. Effective core thickness depends on the application area in construction industry such as for walls purposes or as a roof panel. The larger the core thickness, the higher the edgewise compressive strength, more suitable for walls on the other hand, the smaller the core thickness, the smaller the core thickness, the higher the flexural stiffness, more suitable as a roof panel.
Effect of core thickness on the structural properties of sandwich wood panel / Tee Kim Hean