Crushed Miscellaneous Base

[StructuralEngGuy]

Does anyone have any insight on aggregate base under a building slab (used as a capillary break) being substituted with CMB? My research so far hasn't turned up anything negative. Thoughts?

 

[Ron]

A capillary barrier needs to have a fineness modulus of around 3 or more to work. I don't know your definition of crushed miscellaneous base material, but any crusher run material will have fines in it. It might not have enough interstitial void space to serve as a capillary break.

Get gradation results and calculate fineness modulus (see ASTM C33 or PCA Design and Control of Concrete Mixtures).