Concrete pH Changes Across Regions

[VenomousWaters25]

I observed a pattern where concrete slabs seem to show higher pH levels as I move from northern to southern regions. This could be influenced by variations in aggregate materials or water demands in drier climates, I guess. Anyone else observed this or found research to back it up?

 

[concreteer1]

You're right, it can be due to differences in aggregate materials, such as more alkaline limestone in southern areas, and variations in water quality used for mixing. Also, drier climmates can cause a faster curing which affects the ph levels.

 

[VenomousWaters25]

You're right, it can be due to differences in aggregate materials, such as more alkaline limestone in southern areas, and variations in water quality used for mixing. Also, drier climmates can cause a faster curing which affects the ph levels.

That lines up with what I suspected. Have you encountered any data sets or field reports comparing regional mix designs? I'd like to see how consistent the pH shift is when controlling for variables like water:cement ratio and cure time.

 

[slippingslope11]

That lines up with what I suspected. Have you encountered any data sets or field reports comparing regional mix designs? I'd like to see how consistent the pH shift is when controlling for variables like water:cement ratio and cure time.

I'm guessing state dot or federal highway administration should have some research and data on this

 

[VenomousWaters25]

I'm guessing state dot or federal highway administration should have some research and data on this

Yes that makes sense. Those DOT and highway folks probably have a mountain of data from different projects over the years. I'll try digging around their websites and see if I can unearth any of those reports you mentioned. Would be real helpful to see some hard numbers on this pH shift.