WRONG WAY

Old House Journal - - Restore -

JUST TOP­PING IT OFF

The chem­i­cal com­plex­ity of con­crete cur­ing is be­yond the scope of this page, but it is im­por­tant to un­der­stand that al­though Port­land ce­ment can form a hard ma­trix around ag­gre­gate (sand, etc.), it has only weak ad­he­sive qual­i­ties. Con­se­quently, sim­ply buy­ing a bag of con­crete or sand mix and ap­ply­ing it to a worn con­crete sur­face will not stand up. It may look okay im­me­di­ately after cure, but you’ll soon see de­lam­i­na­tion.

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