A building I designed is currently in the bid phase and is located in Omaha, NE, right on the border of Iowa and Nebraska. Our specification on this project (as well as every other project I have done in the area) requires ASTM C33 aggregate for the concrete mix. I was told by a concrete supplier bidding the project that ASTM C33 aggregate is common in central Iowa, but not common in Nebraska. This is the first I have ever heard this comment. I am struggling to find any data that could either support or disprove this claim. Has anyone else in the Omaha area ever heard this comment?
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