Q1. Describe various causes or situations which favour the early decay of timber. Discuss various types of repairs required for repairing concrete structures.
- (a)) Describe various causes or situations which favour the early decay of timber. (300 words)
- (b)) Discuss various types of repairs required for repairing concrete structures. (300 words)
Key Points:
- Timber decay is primarily caused by biological agents: fungi (wet rot, dry rot) and insects (termites, borers).
- High moisture content (>20%), poor ventilation, and suitable temperatures are critical for fungal decay in timber.
- Timber insect attacks (termites, borers) cause internal damage, often indicated by bore dust and structural weakening.
- Concrete repair methods include patch repair for localized damage using cementitious or resin mortars.
Answer: Building materials like timber and concrete are subject to degradation over time due to various environmental, biological, and mechanical factors. Understanding these causes of decay and the appropriate repair methods is crucial for effective building maintenance and ensuring the longevity and safety of structures. This comprehensive analysis addresses the early decay of timber and the diverse repair requirements for concrete structures, drawing upon principles taught in the MMPN-006 course. Ti...