24 Questions
What is the minimum crushing strength required for a good building stone?
100 N/mm2
What is an important characteristic of a good building stone in terms of texture?
Compact fine crystalline structure
Why is durability an important requirement for a good building stone?
Because it affects the stone's long-lasting nature
What is the minimum specific gravity required for a good building stone?
2.7
Why is economy an important consideration for a good building stone?
Because it affects the stone's availability and cost
What is one of the purposes of seasoning timber?
To reduce shrinkage and warping
What is an important requirement for a good building stone in terms of fire resistance?
Good fire resistance properties
What type of defect in timber is caused by fungal action?
Defect due to fungal action
What is an important characteristic of a good building stone in terms of structure?
Uniform structure without cracks, fractures, and cavities
What is a characteristic of bamboo that makes it beneficial in earthquake-prone areas?
Its flexibility
What is an important requirement for a good building stone in terms of weathering?
Good weathering resistance properties
What is a type of defect in timber that can occur during conversion?
Radial shake
What is a benefit of using bamboo in construction?
It has better wear and tear resistance
What type of defect in timber is caused by insects?
Defect due to insect attack
What is a part of the bamboo roofing system?
All of the above
What is a use of bamboo in construction?
All of the above
What is the primary purpose of asphalt emulsion?
Waterproofing purposes
What is mastic asphalt used for?
Waterproofing and damp proofing
What is the primary characteristic of asphalt that makes it suitable for building construction?
It is a good insulator of electricity, heat, and sound
What is the difference between natural asphalt and residual asphalt?
Natural asphalt is obtained from natural sources, while residual asphalt is obtained from crude petroleum oils
What is the primary advantage of using bamboo in construction?
It is a viable alternative to steel reinforcement
What is the purpose of asphaltic cement?
Roofing, flooring, and filler in expansion joints
What is cutback asphalt used for?
Preparing bituminous paints
What is the primary property of asphalt that makes it suitable for road construction?
It is a durable and tough material
Study Notes
Natural Construction Materials
Stone
- Requirements of good building stone:
- Crushing strength: greater than 100 N/mm2
- Hardness: sufficient
- Durability: long-lasting
- Fire resistance: good
- Seasoning/weathering: good
- Water resistance: less water absorption
- Economy: economical and easily available
- Attrition: less wear and tear
- Facing and dressing: easily molded and dressed
- Specific gravity: higher than 2.7
- Texture: compact, fine crystalline, no cracks or cavities
- Characteristics of stone:
- Appearance: fine, compact texture, uniform color
- Structure: uniform, no cracks or fractures
- Strength: greater than 100 N/mm2
- Weight: considerable and suitable for construction sites
Timber
- Defects in timber:
- Natural defects: knots, twisted fibers, ring shakes, rupture
- Defects due to conversion: radial shakes, case hardening, twisted, bowing, honey combing
- Defects formed due to insects: termite, insect, beetle, stem borer attacks
- Defects formed due to fungal action: reduces wood strength
- Defects due to seasoning: warp, cup, bow, twist
Bamboo as a Building Material
- Characteristics:
- Strength comparable to teak and sal
- Can be used for trusses, roofs, walls, doors, windows, and flooring
- Benefits: lightweight, flexible, earthquake-resistant, and cost-effective
- Applications:
- Bamboo trusses and roofs
- Bamboo walling and ceiling
- Bamboo doors and windows
- Bamboo flooring
- Scaffolding
Asphalt
- Types:
- Cutback asphalt: liquid asphalt for preparing bituminous paints and repairing roofs
- Asphalt emulsion: for water proofing
- Asphaltic cement: for roofing, flooring, water proofing, and filler in expansion joints in concrete
- Mastic asphalt: for damp proofing and water proofing
- Classification:
- Natural asphalt: obtained from natural sources
- Residual asphalt: obtained by fractional distillation of crude petroleum oils
- Properties:
- Waterproof and easily cleaned
- Durable and tough
- Resilient and elastic
- Good insulator of electricity, heat, and sound
- Uses:
- Damp proofing
- Roads and pavements
- Swimming pools, tanks, and basements
This quiz covers the requirements of good building stone, including crushing strength and hardness. It's a part of the CE102H course.
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