Hidden aggregate in driveway concrete

Old 09-28-16, 12:57 PM
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Hidden aggregate in driveway concrete

My driveway appeared to be just concrete at first glance. Pulling dead weeds and debris from cracks and discovered various sized stones embedded in concrete. But no aggregate obvious on surface so not intended to be exposed aggregate driveway.

The stones have made cracks very jagged and would be difficult to chisel (might even make more cracks by loosening stones embedded in concrete inside cracks).

What do I use to seal fairly large and deep cracks? I intended to put backer rod at bottom. But would need several layers to get within 1/2" of surface for crack sealing.

Should I fill in with concrete with aggregate or just cement? Will be difficult to fill small voids under embedded stones along crack sides unless I use a slurry. No way to pack in concrete or thick patch material into cracks.

What will help bond whatever I put in crack to existing driveway composition.?

Second issue. I have an aggregate "canyon" in front of storage room door. This is along roof drip line (no gutters installed yet) so obviously caused by long-term exposure to lots of water. How do I fix this?
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Old 10-08-16, 02:56 PM
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just concrete is made from a mixture of cement, fine aggregate ( typically sand ), coarse aggregate, & water,,, what you're probably seeing is old concrete that's had the paste worn off - usually from running water,,, concrete doesn't need aggregate because its already 1 of the 4 main ingredient,,, cement paste is a mixture of water & cement paste,,, add sand & you basically get mortar

use closed cell backer rod 25% larger than the crack & seal w/either 100% silicone OR polyurethane - non-sag or self-leveling,,, we prefer non-sag

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