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Pro tip: I finally figured out why everyone's broom finish on sidewalks looks so weak after a winter.
I was convinced a light pass was fine until my foreman in Minneapolis showed me how pressing the broom down for a full 3 seconds per pull creates deeper grooves that actually hold up against salt and freeze-thaw cycles.
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wesley_grant331mo ago
My buddy in Chicago tried that heavy broom method on a driveway apron last fall. He called me this spring pissed off because the whole section spiderwebbed with tiny cracks. The pressure basically pre-stressed the concrete in the worst way. Now he's got a weak spot that'll probably need a full replacement in a couple years, not just a surface fix.
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wyatt7712mo ago
But that extra pressure can also cause micro-fractures in the surface, right?
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caseys522mo ago
Wait, micro-fractures? That sounds way more serious than I thought! @wyatt771, are you saying the fix for one problem could actually be creating a whole new type of damage? That's wild. I figured the pressure was just a temporary thing, not something that cracks the material itself. Man, engineering is full of these tricky trade-offs, huh?
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