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As a member of the Chartered Institute of Architectural Technologists I am often asked this question when the surface of someones concrete path or ramp starts to break up.
Most builders will use a general mix of concrete for a path or ramp and as soon as people put salt on it in winter will blame the owner as salt will damage general concrete.
As it is not unreasonable for people to put salt on an icy path or ramp then the builder should have used a road grade concrete as roads don't generally break up after salting in winter.
The concrete mix should be stronger and have a higher water:cement ratio, more cement and less water. Normally builders will work the concrete bringing water to the surface; this leaves a very weak mix on the surface that will break up very quickly.
Concrete should not be over worked to leave mini air bubbles in the concrete
and to stop water from coming to the surface.
In extreme conditions air entrained concrete should be used.
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∙ 11y ago
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