Tuesday, March 20, 2012

CT 227-March 2012 Changes

Caltrans is moving quickly through its test methods and has made a lot of changes this year.  This month they've posted changes to CT 227-Method of Test for Evaluating Cleanness of Coarse Aggregate.  There are not many changes to this one as you can see below.

  • The test method has changed from metric units to English units
  • You are no longer able to use tap water during testing, even if you can prove there is no difference in test results.  You must use distilled or deionized water.
  • If your water is not within 72± 5˚F you can now use a temperature correction factor.  You determine the correction factor by the same method as in CT 217.
  • The full formula for calculating CV is now present.  Before it only showed part of the equation.  The new equation is as follows: 

       That's all! The new test method can be found on the Caltrans website and here.

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