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Answer to How does aggregate size affect cement demand? by Builderz Focus https://www.quora.com/How-does-aggregate-size-affect-cement-demand/answer/Builderz-Focus?ch=18&oid=336466202&share=25cfa03f&srid=huLYBD&target_type=answer

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Cement as most popular construction material it's quality is very important for the resulting structure.

At site cement quality can be checked, so we can have confidence to our cement, the following are methods that are used to check cement quality at site.

1.Date of packaging, cement strength decreases with time from manufacturing date.

2.Color of cement, cement color should be uniform, that means its well mixed with same material.

3. Check for lumps

4. Rubbing of cement.

5.Cement temperature test.

6. Float test.

7.Setting test.

For more description you can click Insitu Cement quality checking

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STAIR is one of most important components of building, especially those with more than one floor and those constructed at height.

The following are main parts forming a stair.

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This is in situ test which is used to determine the degree of compaction of the road layers (lower layers) such as subgrade, subbase layers or any compacted fill such as embarkment or backfill.

For more you can click on Insitu density Test

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Concrete cover is provided to make reinforcements embedded inside concrete durable, because reinforcements are more affected by environmental attack compared to concrete, concrete cover are provide to reinforcements for the following reasons.

1. Provision of thermal insulation to reinforcements, this is done because steel reinforcements properties such as ductility and strength tend to decrease on high temperatures, since concrete is more stable than reinforcements then concrete cover is provided.

2. To keep reinforcements away from chemical attacks.