Equipment Checklist for AASHTO T 90-96
Determining the Plastic Limit and Plasticity Index of Soils
 
All equipment shall be inspected for compliance with appropriate dimension s, as stated in each standard, as well as to determine if it is in satisfactory operation condition (i.e. clean, tight and serviceable). Inspection shall occur at least annually, or whenever there is reason to suspect nonconformance with the standard.

 

 
Item Mixing Equipment
Description Dish, porcelain, ~115 mm in diameter Spatula, blade, ~75-100 mm long and 20mm wide
     
Calibration Item See general statement above
Calibration Procedure
Calibration Interval
 
Item Rolling Surface
Description Ground glass plate, unglazed paper
     
Calibration Item See the general statement above
Calibration Procedure
Calibration Interval
 
Item (Optional) Rolling Surface
Description Plastic limit device conforming to dimensions in AASHTO T-90, Fig. 1
     
Calibration Item Dimensions
Calibration Procedure AASHTO T-90, Fig. 1
Calibration Interval Not stated
 
Item Containers (Moisture Content)
Description As described in Sec. 3.6 (metallic, tinned steel or aluminum)
     
Calibration Item See the general statement above. (serviceable lids with no rust or corrosion)
Calibration Procedure
Calibration Interval
 
Item Balance
Description Conforms to AASHTO M 231, Class G1 (0.01 gm)
     
Calibration Item Accuracy and condition
Calibration Procedure AASHTO M 231, Sec. 4.2 and 4.3
Calibration Interval Not stated
 
Item Oven
Description Thermostatically controlled, forced draft, 110C + 5
     
Calibration Item Temperature
Calibration Procedure AASHTO 265, sec. 3.1
Calibration Interval