New Jersey

Department of Transportation

Standard Specifications

for Road and Bridge Construction

2007


NJDOT A-4 Determining Percent of Adherent Fines Present in
Coarse Aggregate

  1. Scope. This test method is used to determine the percentage of adherent fines present in coarse aggregate.

  2. Apparatus. Use apparatus as required in AASHTO T 11 and a No. 16 sieve conforming to the requirements of AASHTO M 92.

  3. Procedure. Perform the following steps:

    1. Obtain a test sample from a representative field sample.
    2. Dry the test sample to constant mass at a temperature of 230 9 F.
    3. Weigh the sample to the nearest 0.1 percent.
    4. Sieve the sample for less than 1 minute over a No. 16 sieve. Weigh the material retained on the No. 16 sieve. Consider the material passing the No. 16 sieve as non-adherent fines.
    5. Test the material retained on the No. 16 sieve according to AASHTO T 11 to determine the weight of material passing the No. 200 sieve. Consider material passing the No. 200 sieve as adherent fines.

  4. Calculations. Calculate the percentage of non-adherent fines and the percentage of adherent fines as follows:


  5.  Percent of Non-Adherent Fines = 
    WT - W16 

     x 100
    WT 
     

     Percent of Adherent Fines = 
    W16 - WA

     x 100
    W16 
     
      Where:
      WT = Total weight of test sample as determined in Step 3
      W16 = Weight retained on No. 16 sieve as determined in Step 4
      WA = Weight of sample after washing over the No. 200 sieve as determined in Step 5

  6. Report. Report the percent non-adherent fines and the percent adherent fines.

Last Document Correction:
December 14, 2007