Tim, with your water volume, I doubt that the concrete will change the pH 0.1 point.

I used 3 tri-axle dump trucks on one side of my pond, and there's no change in the water. Plus, most of it has sunk down into the sand now. But it is doing it's job and stabilizing the shoreline that is under/out of the water due to fluctuating water levels.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).