Determination Of Stripping Value Of Aggregates

STANDARD

  • IS:6241-1971

DEFINITION

  • The stripping value of aggregates is determined as the ratio of the in covered area observed visually to the total area of aggregates, expressed as a percentage.

APPARATUS

  • Heat resistant glass beaker of 500 ml capacity.
  • 20mm and 12.5 mm IS sieves.
  • Mixer.
  • Balance of capacity 10Kg and sensitivity 1 gram.
  • Water bath preferably with a thermostat.

PROCEDURE

  • Take 200 grams of dry and clean aggregates passing 20mm and retained on 12.5mm sieves and heat up to 150°C.
  • Take five percent by weight of bitumen binder and heat up to 160°C.
  • Mix the aggregates and the binder till they are completely coated and transfer the mixture in to a 500ml beaker and allow to cool at room temperature for about 2 hours.
  • Add distilled water to immerse the coated aggregates.
  • Cover the beaker and keep in a water bath maintained at 40°C taking care that the level of water in the water bath is at least half the height of the beaker.
  • After 24 hours take the beaker out, cool at room temperature and estimate the extent of stripping visually while the specimen is still under the water. 

REPORT

  • Express the stripping value as the ratio of the covered area observed visually to the total area of aggregates in each test.
  • Report the mean of three results as stripping value of the tested aggregates to the nearest whole number.

PRECAUTION

  • Care shall be taken while mixing aggregates with bitumen.

DETERMINATION OF STRIPPING VALUE OF AGGREGATES
I
S: 6241-1971

Description Units Test I Test 2 Average
Wt. of dry aggregates gms
Temperature of aggregates °C
Wt. of bitumen gms.
Mixing temperature °C
Retained coating observed %
Specified Limit: Minimum retained coating observed should be 95% (Minimum)
Remarks:

Stripping Value Test – Excel Performa

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