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Why is it important not to spend a long time troweling the surface of newly placed concrete?

April 26, 2017concrete newly Placed spend time troweling

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Why is it important not to spend a long time troweling the surface of newly placed concrete?

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Excessive troweling after the placement and screeding of the concrete will bring excess fines and water to the surface, weakening the surface. Hairline cracks and dusting can result. Over-troweling the surface during finishing can produce the same problems.