Silt test.
The silt test is carried out to determine the amount of silt, clay or other fine dust that may be present in a sand sample. The presence of such in a sand used in concrete will reduce the strength of the hardened concrete if exceeds a permitted limit. The permitted limit is 8 percent.
Equipment used:
Sample of sand, Saline solution (one per cent common saltwater), graduated cylinder and calculator.
Method:
•Put 50 ml of saline solution into the graduated cylinder.
•Continue to add sand up the 100 ml mark.
•Add more saline solution until the 150 mark is reached.
•Shake well covering the top of the graduated cylinder with your hand.
•Allow to settle for three hours.
•Measure the heights of both sand and silt respectively.
•Calculate the amount of silt as a percentage of the amount of sand.
Calculating the percentage using the following formula:
Height of silt layer X100 = percentage of silt present
Height of sand layer
( Er. Ashish Srivastava )
The silt test is carried out to determine the amount of silt, clay or other fine dust that may be present in a sand sample. The presence of such in a sand used in concrete will reduce the strength of the hardened concrete if exceeds a permitted limit. The permitted limit is 8 percent.
Equipment used:
Sample of sand, Saline solution (one per cent common saltwater), graduated cylinder and calculator.
Method:
•Put 50 ml of saline solution into the graduated cylinder.
•Continue to add sand up the 100 ml mark.
•Add more saline solution until the 150 mark is reached.
•Shake well covering the top of the graduated cylinder with your hand.
•Allow to settle for three hours.
•Measure the heights of both sand and silt respectively.
•Calculate the amount of silt as a percentage of the amount of sand.
Calculating the percentage using the following formula:
Height of silt layer X100 = percentage of silt present
Height of sand layer
( Er. Ashish Srivastava )
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