Old House Journal - - Contents - By Ray Tschoepe

Con­crete bond­ing is­sues.

If yours is a 20th-cen­tury house (or per­haps even late-19th-cen­tury), it’s likely you have some ag­ing con­crete: steps or walk­ways spalling after many icy win­ters, a base­ment floor cracked from years of heavy use or wa­ter in­fil­tra­tion. You may have been told that re­place­ment is the only op­tion. If you are look­ing for a way to resur­face de­te­ri­o­rated con­crete with­out the mess and ex­pense as­so­ci­ated with re­moval and re­place­ment, you do have other op­tions. Fresh Port­land ce­ment does not eas­ily form a hard chem­i­cal ma­trix around old ma­te­rial—hence the lack of a good bond. If you’ve ever added a top­coat of or­di­nary con­crete to the sur­face of ex­ist­ing con­crete, you know that the new mix ei­ther didn’t ad­here or failed in short or­der.

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