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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