Test#6: Organic Impurities in Sand ( AASHTO T21/ASTM C40)

Organic impurities in sand (AASHTO T21/ASTM C40)
The method provides a good estimate of this type of organic matter , and when the soil contains only this type, it can also provide a good estimate of the total organic content.However the reagents used to react only very slightly with fresh plant materials such as wood , roots , and weed tops etc.., or with hydrocarbons , charcoal, lignite, coal and the organic remains in ancient sediments. If such materials are present, and the total organic matter is to be determined , then the "LOSS ON IGNITION" T 267 method must be used 

Test#5: Los Angeles abrasion test in accordance with ( AASHTO T96-ASTM C 131)

 Los Angeles  abrasion test in accordance  with (  AASHTO  T 96 - ASTM C 131 )

This method covers the procedure for testing crushed rock, slag and gravel and uncrushed gravel for resistance to abrasion using the Los Angeles testing machine .The Los Angeles Rattler test is a measure of degradation of mineral aggregates of standard gradings resulting from a combination of actions including abrasion or attrition,impact,and grinding in a rotating steel drum containing a specified number of steel spheres (dependent upon the test sample"s grading).
As the drum rotates , a shelf plate picks up the sample and the steel spheres, carrying them around until they are dropped to the opposite side of the drum,causing an impact-crushing effect.The contents then roll withi the drum with an abrading and grinding action until the shelf plate impacts and the cycle is repeated.After the prescribes number of revolutions,the contents are removed from the drum and the aggregate portion is sieved to measure the degradation as percent loss.