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Crushed Miscellaneous Base

Crushed Miscellaneous Base

Crushed Miscellaneous Base

(OP)
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?

RE: Crushed Miscellaneous Base

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).

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