Category talk:403 Asphaltic Concrete Pavement

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403.1.5 under Gradation line 4 and 5 shouldn't the sentance"QA is required to independently sample the aggregate and perform a sieve analysis once per lot." read "once per day."?

Dan Tschirgi: Thank-you for your inquiry. Current Standard Specification 403.19.3 requires 1 sample per lot for QA. Sec 403.18.1 also has a requirement for QA testing of one retained sample per week. Please contact the Construction and Materials Division if you have additional questions on this requirement.

I see now that you are correct. The QA test frequence for cold feed gradation was changed to one per lot. Can you tell me when that change was made to the Standard Specification?

Dan Tschirgi: The effective date of this change to the table (Sec 403.19.3) was February 1, 2008. You may have subscribed already, but if not, an E-Update subscription will notify you of all standard and policy changes. A link to the E-Update subscription sign-up is on the MoDOT internet home page.