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Bleeding-coming out of excess water thus causing pores in concrete.
Harshness-Resistance offered by concrete to its surface.
Segregation-Separation of coare aggregate from fine aggregates
- A free electron is the electron which is loosely attached to the nucleus.
- These electrons are responsible for flow of current.
- Therefore the orrect option is C.
- Percentage increase of carbon in steel ,decreases its ductility.
- But brittleness, strength and hardness of steel increases with increase in carbon content.
- Cast iron has the highest percentage carbon and mild steel lowest.
Specific gravity of most of natural aggregates is lies between 2.4 to 2.8 range. Low specific gravity indicates low strength.
Workability test
1- Compaction factor test – in terms of internal energy
2-Slump test – in terms of slump obtained
3- Flow test- based on percentage flow of concrete.
Consistancy test of cement is done by using Vicate apparus.
Vee Bee consistometer – For workability of concrete
- First class brick are thoroughly burnt and are of deep red, cherry or copper colour.
- First class bricks are recommended for pointing, exposed face work in masonry structures, flooring and reinforced brick work.
- The crushing strength of the brick should not be less than 10 MPa.
- Common bricks are often made with clay containing fewer fine particles, and therefore, are rough in texture.
- Face bricks are often pressed to create a smooth, even brick shape.
- The brick should not be too smooth because it cause slipping of mortar while constructing building.
- Brick earth is a type of soil that is ideal for making bricks.
- Eventhough the main ingredient of brick is silica, the major constituent of good brick is Alumina.
- Alumina acts as a cementing material in raw cement.
- It prevents plasticity and makes brick harder.
- Constituent of good brick earth is:
- Silica 50-60%
- Alumina 20-30%
- Lime 4-5%
- Iron oxide 5-6%
- Magnesia 1%
Strongest and commonly used bond is English bond and it consist of alternate course of headers and stretcher.
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