112013
| Question | Answer |
| What are the main rocks in construction? | Aluminium and iron-ores Brick-clay Glass-sand Cement and concrete-limestone Granite, limestone and marble-mined or quarried |
| What type of rock is limestone ? | Sedimentary |
| Is limestone soft or hard? | soft |
| What type of rock is marble? | Metamorphic |
| Is marble harder or softer than limestone? | Harder |
| How is granite formed? | Magma cools and solidifies. It is an igneous rock with interlocking crystals making it hard. |
| How does calcium carbonate break down? | Thermal decomposition when heated. |
| What is the equation for thermal decomposition of caco3.? | calcium carbonate--> calcium oxide +carbon dioxide CaCO3 --> CaO + CO2 |
| How is cement made? | Limestone is heated with clay. |
| How is concrete made? | Mixing cement, sand and small stones with water. |
| Reinforced concrete is a ... | ... composite material.(steel rods or meshes) |
| Concrete is strong... | ...under compression |
| Concrete is weak... | ...under tension. |
| How is this problems overcome? | Reinforced concrete. It is harder and more flexible. |
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