| Sun Aug 16, 2015 | Total posts : 1 |
|  Topic: Sand and Cement
Dear Experts,
I am starting my house construction in Bangalore. i have the below queries, please provide your expertise 1) I am going for M sand. Which branded M sand supplier is good in Banaglore.
2) Is it better to mix M sand and river sand and use or is it safe enough to use M sand alone?
3) whether to go with 53 grade cement or 43 grade cement
4) Planning to consider coromondal cement. whether Coromondal cement is equally good as Birla super?. i see there is difference of around 25 rs per bag between these two brands.
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| Mon Aug 17, 2015 | Post #1 | S L Gupta (Civil Engg)
Join date: Mar 2008 | Dear
You should check sand for the specification given below
Fine aggregate/ coarse sand consists of natural
sand, crushed stone sand or crushed gravel stone dust. It should be
hard, durable chemically inert, clean and free from organic matter, not
containing any appreciable amount of clay balls or pellets and other
harmful impurities i. e. alkaline, salt, mica, decayed vegetation, lumps
etc.
It should be passed through I. S. Sieve 4.75 MM. It should have the
finest modulus 2.50 to 3.50 and silt contents should not be more than
4%. Coarse sand should be either river sand or pit sand; or combination
of the two.
Note: In general the sand particle should be coarser and have minimum silt contents. The silt contents should not be more than 4%. Caution:
The quality of the sand has more impact on the strength of the structure inspite of the quantity of the cement used.
1) If there is more silt in coarse sand, the strength of cement mortar is reduced from 1 % to 30%.
2) If you take best quality coarse sand, it will give maximum strength.
Quality of Coarse Sand
Actual
specification for the quality of coarse sand can be obtained by
laboratory test but in general we can judge the quality of coarse sand
in the field through the following ways.
1. Observe whether
there are any lumps of earth or clay balls, grass and decayed vegetation
etc. in coarse sand to check silt contents.
2. Take some samples of coarse sand in hand and observe
The particles of sand should be coarser.
Silt contents should be less
3. Take some sand in hand and drop it down
One
can simply check the quality of sand by taking some sand in the hand
and then dropping it down. If some finest material sticks with hand,
the sand has some silt contents and finer sand.
4. Check silts contents with the help of water
Take
empty glass and put some sand and water in the glass and stir it well.
After some time the silt layer will be framed between sand and water
which shows the quantity of the silt contents present in the sand.
For cement 43 grade is good. use branded factory manufactured cement not for plant manufactured cement.
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