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Concrete cracks when it is subjected to tensile stress (forces that pull apart on something vs forces that push together something). Concrete has very strong compressive strength and very poor tensile strength. That’s why concrete is reinforced with steel reinforcing called rebar. Concrete is strong once cured, but still has weight limits. Premature Drying. If the top of the concrete slab dries too quickly, crazing cracks can form. These are very fine surface cracks that resemble spider webs or shattered glass. Crazing cracks can be unsightly, but are not a structural problem. These cracks - no matter what the width - are rarely acceptable. Consult an engineer or concrete repair professional to determine the cause of the crack and to recommend the best repair solution. For hairline or non-structural cracks in concrete, the answer as to what’s acceptable is less clear.
In terms of function, concrete slabs act as both the foundation for the ground floor, as well as the upper slabs that may act as ceilings. Concrete slabs are crucial and serve multiple purposes. This article will give you answers on how to fix cracks in cement slab foundation. The slab is supported at the perimeter by concrete foundation walls and at the interior by concrete columns, drop slab, and column capitals. Review found cracking at the underside of slab in regions of positive bending (tension side; which I know can be expected) away from columns, but some of the cracks are larger than expected (1/8' wide).
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Acceptable Flexural Crack Width in Two-way Slab?Acceptable Flexural Crack Width in Two-way Slab?
I completed a visual review of the underside of a two-way concrete slab as part of a reserve fund study. The slab supports first floor residential space and the structure for three additional residential floors and roof above. Below the slab is a parking garage. The parking garage is below grade. The slab is supported at the perimeter by concrete foundation walls and at the interior by concrete columns, drop slab, and column capitals. Review found cracking at the underside of slab in regions of positive bending (tension side; which I know can be expected) away from columns, but some of the cracks are larger than expected (1/8' wide). Is this a function of poor crack control? Has anyone had similar experiences?
Why Does Concrete CrackCracks in concrete roof slabCracks in concrete roof slab![]() Cracks In New Concrete
I was asked by owner of a newly constructed building to inspect cracks in the top of a concrete roof. The building was constructed in April this year. The cracks were noticed because after heavy rainfall water would leak through the slab and into the building. The crack widths are about 3mm thick but there are quite a number of them on the roof slab, however none appearing on the soffit. The concrete supplier is blaming the contractor for inadequte curing, whilst the contractor is suggesting the concrete mix was not correct.
Question: Can anyone recommend any products that will seal the cracks or any solutions to this cracking problem. After sealing i would also advise that the slab be rendered with slope to facilitate faster runoff Thanks for any input SNaTCH Comments are closed.
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