What Is This Concrete Crack Filler And More? - Concrete, Stone & Masonry - DIY Chatroom Home Improvement Forum

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Old 10-07-2013, 08:39 PM   #1
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What is this concrete crack filler and more?

I notice these mostly on concrete stairs, walkways, and paths to fill gaps between concrete "blocks".

It looks like concrete gap filler that I use for some homeowner housework, but it's a lot wider (and perhaps deeper) in area than what I do with it.

Is this concrete gap filler material or something similar? And they don't actually fill it deep with that right? So then what is likely underneath that?
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daluu is offline   Reply With Quote
Old 10-08-2013, 04:42 AM   #2
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IF you'll look, you'll also see it on conc hgwys, airport aprons, & any place you'd find conc slabs,,, its joint seal & the purpose is to keep incompressibles OUT of the space between the slabs,,, why you ask ? when conc ( or any solid ) gets hot, it expands [ hi-skoul fizzix ] when it expands, the ' gap ' gets smallered,,, when it smallers, the stuff that won't compress causes the conc to ' spall ' ( fracture [ break ] )

joint sealants are designed for optimal performance at certain depth:width ratios,,, to seal the jnt w/more would cause either adhesive, cohesive sealant failures OR, at the least, shorter svce life.

underneath the sealant you'll usually find a foam-stuff backer rod installed @ a depth to prevent oversealing,,, simple, huh ?


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