Equipment Checklist for AASHTO R 39
Making and Curing Concrete Test Specimens in the Laboratory
 
All equipment shall be inspected for compliance with appropriate dimensions, as stated in each standard, as well as to determine if it is in satisfactory operating condition (i.e.; adherence of mortar, deformed molds, etc.). Inspection shall occur at least annually, or whenever there is reason to suspect nonconformance with the standard.

 

 
  Item Cylinder molds & lids
  Description Steel, cast iron or other non-absorbent, non-reactive material of a size consistent with the nominal maximum size of the coarse aggregate
     
  Calibration Item Dimensions, shape, water leakage
  Calibration Procedure

AASHTO T 23
  Calibration Interval See AASHTO M 205
 
  Item Tamping rods
  Description Straight steel rods (5/8" x 24" or 3/8" x 12")
     
  Calibration Item Verify dimensions
  Calibration Procedure Measure dimensions
  Calibration Interval 12 months
 
  Item Internal vibrator
  Description 7000 vibrations per minute, or greater, while in use and of a appropriate size
     
  Calibration Item Frequency
  Calibration Procedure AASHTO T 23 Sec. 4.5
  Calibration Interval 12 months
 
  Item External vibrator
  Description 3600 vibrations per minute, or greater
     
  Calibration Item Frequency
  Calibration Procedure AASHTO T 23, Sec. 4.5
  Calibration Interval 12 months
 
  Item Mallet
  Description Rubber or rawhide
     
  Calibration Item Mass
  Calibration Procedure Weigh with a balance
  Calibration Interval 12 months
 
  Item Balance
  Description Accuracy within 0.3% of of test load
     
  Calibration Item Verify mass readings
  Calibration Procedure AASHTO M 231
  Calibration Interval 12 months
 
  Item Thermometer
  Description Concrete temperature
     
  Calibration Item Temperature readings
  Calibration Procedure Verify measurement
  Calibration Interval 12 months
 
  Item Miscellaneous Equipment
  Description Shovels, scoops, handheld float, trowel, sampling and mixing pan
     
  Calibration Item Check physical condition
  Calibration Procedure Visual
  Calibration Interval 12 months
 
  Item Concrete mixer
  Description Capable of throroughly mixing adequate size samples
     
  Calibration Item Check physical condition and operation
  Calibration Procedure Visual
  Calibration Interval 12 months