PERTANIKA JOURNAL OF SCIENCE AND TECHNOLOGY

Bamboo is increasingly used as an alternative material for producing renewable and environmentally friendly products. Bamboo should be dried before use to increase its stability and improve its resistance against biodeterioration agents. The most common drying method for bamboo is through air-drying. Alternatively, artificial drying, such as solar drying, can produce optimum drying results regarding the drying rate and quality of bamboo throughput. This study investigated the potential utilisation of solar drying methods for processing local bamboo. The drying characteristics and physical and mechanical properties of solar-dried Gigantochloa levis bamboo culms’ bottom, middle, and top sections were determined. The drying time of G. levis culm has been reduced to about 40 days compared to the conventional air drying of 70 days using the solar-assisted kiln dryer. Solar-dried culms have a lower final moisture content of 20% than air-dried ones. The average circumference and diameter shrinkage values of solar-dried G. levis culms from green to approximately 12% moisture content were 3.22% and 4.29%, respectively, and the wall thickness shrinkage was 8.12%. The mean values of modulus of rupture and modulus of elasticity of solar-dried G. levis culm were 63.75 and 12567.99 N mm^-2, respectively, while its mean values of compression and shear parallel to fibre were 45.87 and 10.01 N mm^-2, respectively. The quality of solar-dried G. levis culms produced in this study showed the viability of using a solar-assisted kiln-dryer as a potential alternative processing method for drying local bamboo species in Malaysia.

• Abdullah Siam, N., Uyup, M. K. A., Husain, H., Mohmod, A. L., & Awalludin, M. F. (2019). Anatomical, physical and mechanical properties of thirteen malaysian bamboo species. Bioresources, 14(2), 3925-3943. https://doi.org/10.15376/biores.14.2.3925-3943

• Anonymous. (1976). Indian standard methods of tests for split bamboos. Indian StandardsInstitution, New Delhi, India.

• Anonymous. (2019). ISO 22157:2019 (E). Bamboo structures – Determination of physical and mechanical properties of bamboo culms-test methods. International Organisation for Standardisation, Geneva.

• Awalluddin, D., Ariffin, M. A. M., Osman, M. H., Hussin, M. W., Ismail, M. A., Lee, H. -S., & Lim, N. H. A. S. (2017). Mechanical properties of different bamboo species. MATEC Web of Conferences, 138, 1-10. https://doi.org/10.1051/matecconf/201713801024

• Awalluddin, D., Ariffin, M. A., Zamri, N.F., Ahmad, Y., Ibrahim, I. S., Osman, M. H., & Lee, H. -S., & Lim, N. H. A. S. (2020). Tensile and shear strength of four species of bamboo in Malaysia. IOP Conference Series: Materials Science and Engineering, 849(1), 012041. https://doi.org/10.1088/1757-899X/849/1/012041

• Azadeh, A., & Ghavami, K. (2018). The influence of heat on shrinkage and water absorption of Dendrocalamus giganteus bamboo as a functionally graded material. Construction and Building Materials, 186,145-154. https://doi.org/10.1016/j.conbuildmat.2018.07.011.

• Azmy, H. M., & Appanah, S. (1995). Bamboo resources conservation and utilization in Malaysia (pp. 1-13). Forest Research Institute Malaysia (FRIM).

• Azreena, A. K., Parid, M., Hazmira, M., Mukrimah, A., Hamdan, H., Lim, H. F., Izani, I.,Othman, D., & Norliyana, A. (2016, September 27-29). Potential of bamboo based industry in Peninsular Malaysia. Proceeding of the Asean Bamboo Symposium 2016 (pp.20). Kuala Lumpur, Malaysia.

• Correal, J. F., & Arbelaez, C. J. (2010). Influence of age and height position on Colombian Guadua angustifolia bamboo mechanical properties. Maderas. Cienciay Tecnología, 12(2), 105-113. https://doi.org/10.4067/S0718-221X2010000200005

• Daud, N. M., Nor, N. M., Yusof, M. A., Al Bakhri, A. A. M., & Shaari, A. A. (2018). The physical and mechanical properties of treated and untreated Gigantochloa scortechinii bamboo. AIP Conference Proceedings, 1930(1), 020016. https://doi.org/10.1063/1.5022910

• Haifaa, K., Helwa, N. H., Enayet, M. M., & Hashish, M. I. (2004). Optimization of solar kiln for drying wood. Drying Technology, 4(4), 677-701. https://doi.org/10.1081/DRT-120034257

• Jacket, B., Machet, W., & Aleksandra, K. (2014). The change of mechanical properties of selected wood species after the drying process under various conditions. Forestry and Wood Technology, 86, 13-17.

• Kamaruzaman, O., Mahpar, A., & Mohamad Zamakhsary, M. (2016, September 27-29). Credit opportunity for bamboo plantation in Malaysia. Proceeding of the Asean Bamboo Symposium 2016 (pp.5). Kuala Lumpur, Malaysia.

• Li, W., & He, S. (2019). Research on the utilization and development of bamboo resources through problem analysis and assessment. IOP Conference Series: Earth and Environmental Science, 300(5), 052028. https://doi.org/10.1088/1755-1315/300/5/052028

• Liese, W., & Tang, T. K. H. (2015). Preservation and drying of bamboo. In W. Liese, & M. Köhl (Eds.), Bamboo, Tropical Forestry 10 (pp. 257-297). Springer International Publishing Switzerland. https://doi.org/10.1007/978-3-319-14133-6_9

• Liese, W., & Köhl, M. (Eds.). (2015). Bamboo - The plant and its uses. Tropical forestry. Springer International Publishing Switzerland. https://doi.org/10.1007/978-3-319-14133-6

• Liu, P. C., Zhou, Q. S., Fu, F. Y., & Li, W. (2021). Effect of bamboo nodes on the mechanical properties of P. edulis (Phyllostachys edulis) bamboo. Forests, 12(10), 1309. https://doi.org/10.3390/f12101309

• Mohamad Omar, M. K., & Mohd Jamil, A. W. (2011). Mechanical properties. In S. C. Lim, K. S. Gan & Y. E. Tan (Eds.), Properties of Acacia Mangium planted in Peninsular Malaysia. ITTO Project on Improving Utilisation and Value adding of Plantation Timbers from Sustainable Sources in Malaysia Project No. PD 306/04 (1) (pp. 23-45). Forest Research Institute Malaysia.

• Mohamad Omar, M. K., & Khairul, M. (2020). Mechanical properties. In A. S. Nordahlia (Eds.), Wood properties and uses of planted Hopea odorata in Peninsular Malaysia (pp. 41-48). FRIM Research Pamphlet No. 145. ISBN 978-967-2149-71-2.

• Mohd Tamizi. (2010). Fundamental and characteristic study of cultivated Malaysian bamboo.[Doctoral dissertation]. Universiti Sains Malaysia.

• Rehman, M. A., & Ishaq, S. M. (1947). Seasoning and shrinkage of bamboo. Indian Forest Records, 4, 1-22.

• Samson, N. U., Zimuzo U., Oji, A. N., Emmanuel, A. E., & Boniface, O. U. (2021). Engineering properties of wood under different drying methods. Global Journal of Engineering and Technology Advances, 07(03), 118-124. https://doi.org/10.30574/gjeta.2021.7.3.0082

• Santhoshkumar, R., & Bhat, K. V. (2014). Variation in density and its relation to anatomical properties in bamboo culms, Bambusa bambos (L.) Voss. Journal of Plant Sciences (Science Publishing Group), 2(3), 108. https://doi.org/10.11648/j.jps.20140203.12

• Sattar, M. A., Kabir, M. F., & Bhattacharjee, D. K. (1992). Physical and mechanical properties of six important bamboo species of Bangladesh. In S. Zhu, W. Li, X. Zhang, & Z. Wang. (Eds.), Proceedings of the International Symposium on Industrial Use of Bamboo (pp. 112-117). Beijing, China.

• Sattar, M. A. (1994). Major energy saving by use of solar timber drying in developing countries. Renewable Energy, 5(Part 1), 457-464. https://doi.org/10.1016/0960-1481(94)90414-6

• Simo-Tagne, M., Zoulalian, A., Romain Rémond, R., & Rogaume, Y. (2018). Mathematical modeling and numerical simulation of a simple solar dryer for tropical wood using a collector. Applied Thermal Engineering, 131,356-369. https://doi.org/10.1016/j.applthermaleng.2017.12.014

• Singhal, P., Rudra, S. G., Singh, R. K., Satya, S., & Naik, S. N. (2018). Impact of drying techniques on the physical quality of bamboo shoots: Implications on tribal’s livelihoods. Indian Journal of Traditional Knowledge, 17(2), 353-359.

• Sosongka, S. B., Hadiyanto, H., & Djaeni, M. (2020). Effects of drying temperature and relative humidity on the quality of dried onion slice. Heliyon, 6(7), e04338. https://doi.org/10.1016/j.heliyon.2020.e04338

• Tang, T. K. H., Welling, J., & Liese, W. (2013). Kiln drying for bamboo culm parts of the species Bambusa stenostachya, Dendrocalamus asper and Thyrsostachys siamensis. Journal of the Indian Academy of Wood Science, 10(1), 26-31. https://doi.org/10.1007/s13196-013-0089-4

• Teussingka, T., Simo-Tagne, M., Njankouo, J. M., Betchewe, G., Ndukwu, M. C., Nwakuba, N. R., Bekkioui, N., & Zoulalian, A. (2023). An experimental and theoretical analysis of the dynamic response of solar drying in natural convection under rainy month of Maroua (Cameroon) of three tropical wood species. Wood Material Science & Engineering, 18(5), 1685-1705. https://doi.org/10.1080/17480272.2023.2178030

• Uetimane, E. (2020). Anatomy, drying behaviour and mechanical properties of lesser used wood species from Mozambique [Doctoral thesis, The Swedish University of Agricultural Sciences]. https://pub.epsilon.slu.se/2356/1/Uetimane_Junior_E_100928.pdf

• Vetter, R. E., S á Ribeiro, R. A., S á Ribeiro, M. G., & Miranda, I., P. A (2015). Studies on drying of imperial bamboo. European Journal of Wood Product, 73, 411-414. https://doi.org/ 10.1007/s007/s00107-015-0900-6

• Wakchaure, M. R., & Kute, S. Y. (2012). Effect of moisture content on physical and mechanical properties of bamboo. Asian Journal of Civil Engineering, 13(6), 753-763.

• Wang, Y., Hui, Z., Yulong, D., Shuguang, W., & Shuyan, L. (2016). Variability of anatomical and chemical properties with age and height in Dendrocalamus brandisii. BioResources, 11(1), 1202-1213. https://doi.org/ 10.15376/biores.11.1.1202-1213

• Xu, Q. F., Liang, C. F., Chen, J. H., Li, Y. C., Qin, H., & Fuhrmann, J. J. (2020). Rapid bamboo invasion (expansion) and its effects on biodiversity and soil processes. Global Ecology and Conservation, 21, e00787. https://doi.org/10.1016/j.gecco.2019.e00787

• Zakikhani, P., Zahari, R., Sultan, M. T. H., & Dayang, L. M. (2017). Morphological, mechanical, and physical properties of four bamboo species. BioResources, 12(2), 2479-2495. https://doi.org/10.15376/biores.12.2.2479-2495