Introduction to Materials & Specification
- We know each other before the class begins and obtain the course outline as our guide to know the topic that we learned before class start
- Materials represent a major expense in construction, so minimizing procurement or purchase costs presents important opportunities for reducing costs.
Bricks
- I learn that bricks have three types , which is common bricks, facing bricks and engineering brick.
- Types of brick have different properties and behavioural of brick.
Cement
- I learn that cement is any material that binds or unites
- In construction, the word cement or cementitious material always refer to an ingredient in concrete, mortar or grout.
- Cement + Water = Paste
- Sand + Gravel + Crushed Stone OR Granular material = Aggregates
- Portland cement consists essentially of compounds of lime (calcium oxide, CaO) mixed with silica (silicon dioxide, SiO2) and alumina (aluminum oxide, Al2O3).
Aggregates
- All Natural aggregate result from breakdown of large rock masses.
- Rock is classified into 3 basic types ^IGNEOUS^SEDIMENTARY^METAMORPHIC^
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Based on source or method of manufacture
a) Sand
b) Gravel or River Gravel
c) Crushed Stone
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Based on size
a) Fine Aggregate
b) Coarse Aggregate
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Based on density
a) Lightweight
b) Normal Weight
c) Heavy Weight
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- Properties : TOUGHNESS AND ABRASION RESISTANCE, PARTICLE SHAPE AND SURFACE TEXTURE, DURABILITY AND SOUNDNESS, SPECIFIC GRAVITY, CLEANLINESS AND DELETERIOUS MATERIALS.
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- Shapes : ANGULAR, ROUND, FLAT and ELONGATED
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