how to repair crack in cement garage floor without making it worse?

It looks like someone filled it in with cement years ago and all that seemed to do was widen the crack. Is there a product on the market that will fill the gap without expanding it?
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The crack widened by itself unless he used expanding foam which is doubtful.

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so should I just reseal it with cement?
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yup!
I filled a garage floor crack ~20 years ago with epoxy structual adhesive...worked great for a long time but the crack widened slightly
how wide is the crack? Is the crack stable (obviously not completely since the crack opened)
if it's less than 3/8" I'd use a flexible material like SIKA self- leveling grout (sealant?)...comes is jumbo caulk tube, works great unless you've got a bottom less crack or the floor has an appreciable slope
search the group for another's experience
cheers Bob
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responding to http://www.homeownershub.com/maintenance/how-to-repair-crack-in-cement-garage-floor-without-making-it-233961-.htm architecturalrealms wrote:
Joe wrote:

All cement mixtures that contain water; will shrink after the water has been evaporated. Depending on how wide your crack is, and considering the expanse of concrete. You want to keep sections small enough to avoid cracks. There are various expasion joint materials that you can use to avoid unsightly future cracks, some of these include: expansion joints, control joints, and construction joints, they are used for various applications. Prior to filling certain cracks, dowels or small sections of rebars are drilled into existing concrete, before pouring the new slab to keep settlements under control, these are packed with none shrink grout that contain very little or no water. ------------------------------------- architecturalrealms.org
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