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robo sand vs natural sand

Sun Apr 06, 2014Total posts : 6
shaik khaja nayab rasool
shaik khaja nayab rasool
Join date: Apr 2014
Topic: robo sand vs natural sand

hai..sir which fine aggregate is good for slab purpose(M20) is it robo sand (stone dust)  or natural sand(river sand).recently in our construction we use robo sand but it gives crack on slab if we robo sand how we avoid the crackes
Mon Apr 07, 2014Post  #1
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008
Dear Rasool
    
The sand particle should be coarser and have minimum silt contents. The silt contents should not be more than 4%. 

The quality of the sand has more impact on the strength of the structure in spite 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.
WASH the sand before use so that silt contents should be reduced, the problem of cracks is mainly due to silt contents.
    See the Article below

http://www.gharexpert.com/articles/Fine-Aggregate-1475/Specification-Fine-Aggregate-Coarse-Sand_0.aspx

http://www.gharexpert.com/home/HOW_TO_PREVENT_CRACKS_IN_BUILDING.aspx

http://www.gharexpert.com/articles/Cracks-718/Which-Various-Reasons-Cracks-in-Buildings-_0.aspx

 
Tue Apr 08, 2014Post  #2
shaik khaja nayab rasool
shaik khaja nayab rasool

Join date: Apr 2014
Post subject: test for slit

thank u sir for ur respond ...what is exact and simple test for calculating the slit content in robo sand in the field..
 
Tue Apr 08, 2014Post  #3
shaik khaja nayab rasool
shaik khaja nayab rasool

Join date: Apr 2014
Post subject: test for slit

thank u sir for ur respond ...what is the exact and simple method for calculating the slit content in robo sand in the field..
 
Wed Apr 09, 2014Post  #4
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008
Dear Rasool
             The silt contents exactly calculated in lab with the help of measuring cylinder.How ever you can see the silt contents in glass pot. Put some quantity of sand in the glass and add water to a higher level than sand. Now stir the mixture of sand and water and after stiring or shaken  it will be left to settle. After some time you will see the layer of silt on the top of the sand which will give you the  silt contents quantity.
 
Wed Apr 09, 2014Post  #5
Purvi Panchal
Purvi Panchal

Join date: Aug 2012
I guess. if "Robo Sand" (crusher dust) is made of stone particle, then it must be equally strong. I have no proof, and I have never used robo sand but I think It can be used in place of river sand.
 
Mon May 19, 2014Post  #6
S L Gupta (Civil Engg)
S L Gupta (Civil Engg)

Join date: Mar 2008
Dear
       The sand for concrete/ flooring should have fine ness modulus not less than 2.4 and silt contents should be less than 4%.
 

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