30. Classification of Timber
Timber remains a crucial material in civil engineering due to its unique properties and versatility. Understanding timber involves examining its classification, internal structure, and physical and mechanical properties, which are essential for its application in construction. The chapter also covers the seasoning and preservation of timber, along with the engineered wood products that address natural timber's limitations.
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What we have learnt
- Timber can be classified by botanical origin, mode of growth, durability, and use.
- The internal structure of timber, including sapwood and heartwood, significantly affects its mechanical properties.
- Seasoning and preservation processes are vital for enhancing timber's durability and usability in construction.
Key Concepts
- -- Hardwood
- Timber derived from broad-leaved angiosperms, characterized by density and strength, often used in high-end construction.
- -- Softwood
- Timber sourced from coniferous gymnosperms, lighter and less dense, generally used in general construction.
- -- Seasoning
- The process of reducing moisture content in timber to improve its strength, durability, and dimensional stability.
- -- Engineered Wood Products
- Manufactured wood products designed for uniformity and enhanced strength, including plywood, MDF, and glue-laminated timber.
- -- Durability
- The ability of timber to resist decay, moisture, and pests, which can be enhanced through seasoning and chemical treatments.
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