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Thanks Ron for your input. I see by your answer that I must clarify something. The asphalt section is new pavement and part of the project. It is not old and weathered. It is scheduled to be placed shortly before the concrete.

Hello everyone, I am reconstructing an airport pavement and the surface part of the section is 16" of PCC wich is being placed on top of 4" AC. Normally I would not see a problem with this but I have heard rumours of a law suit at the airport in Portland, OR. I believe that design involved...

Hello, Can anyone recommend some good books on sustainable or "green" practices in the field of civil engineering. Also welcome are tips on other information resources such as web sites. Thank you

Thank you everyone for your input. Examination of the grades have shown that this was not a case of "bird baths". Subsequent rain events have not yielded the same phenomenon, so I tend to believe that it was caused by the clean virgin asphalt that was still curing.

Hello all, I am in charge of a paving project using standard 1/2" PG-64-10 Caltrans AC mix. The latest area was paved a couple hours before a rain event. This area is now uniformly covered with small puddles of water that doesn't drain off. The grades are around 1% and other areas of the...

First of all I want to say that I appreciate the responses so far. Ron's response made me realize that maybe some further explanation of my situation is necessary. The material I'm refering to is what the FAA calls P-304 Cement-Treated Base Course. Aggregate mixed with about 5% cement and has...

Hello everyone, The use of cement-treated aggregate as base or sub-base layers in pavement sections varies across the country and so does the codes and strength requirements. There are different opinions as to what is strong enough and what is too strong. I am involved in the construction of...