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Why does plastic sheet cause discolouration to freshly placed concrete?

Why does plastic sheet cause discolouration to freshly placed concrete?

Plastic sheets are commonly used in curing to prevent moisture loss from concrete surface. However, it is not uncommon that discolouration occurs on the concrete surface.

When plastic sheeting is spread over concrete surface and in direct contact with concrete, it tends to leave colour streaks on concrete surface. The problem of discolouration becomes even worse when calcium chloride is used in concrete mixes.

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This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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Kanwarjot Singh

Kanwarjot Singh is the founder of Civil Engineering Portal, a leading civil engineering website which has been awarded as the best online publication by CIDC. He did his BE civil from Thapar University, Patiala and has been working on this website with his team of Civil Engineers.

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