13045 P-504 High Early PCC Flashcards
What type of cement is acceptable for high early strength concrete?
A: ASTM C150, Type I, Type II, or Type III or “Rapid Set C-150 Cement” as manufactured by the CTS Cement Manufacturing Company
What are the strength requirements for the high early strength concrete?
A: 550 psi flex at 24 hours and 650 flex at opening and 750 at 28 days
What is required for curing of the high early concrete?
A: conform the the recommendations of the curing material manufacturer and the cement manufacturer
How much time is allowed after placement until high early concrete must be set up?
A: 30 mins
What is the average required air content for high early concrete?
A: 4.5 %, plus or minus 1%
The base is required to be treated in what way before the placement of high early concrete?
A: moistened with water
Is slip forming allowed for high early concrete?
A: No
What type of curing is required?
A: Water curing for at least 2 hours or until the concrete cools, then an impervious curing membrane shall be applied
How long of a curing period is required?
A: 36 hours
What time is pavement required to be opened up to the airport?
A: 0800 hours
What special requirements are there for testings?
A: There is an opening time test required. Provisions for completing this test are in the specifications
