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Washington, D.C. Construction of a bridge and road near Independence Avenue and 14th and 16th Streets, S.W. Waterproof paper…
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Washington, D.C. Construction of a bridge and road near Independence Avenue and 14th and 16th Streets, S.W. Waterproof paper is placed on a prepared subgrade before pouring the concrete to prevent the water in the mixture from being soaked up by the soil. The water stays in the concrete, making it stronger. Sourced from the Library of Congress.

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Washington, D.C. Construction of a bridge and road near Independence Avenue and 14th and 16th Streets, S.W. Waterproof paper is placed on a prepared subgrade before pouring the concrete to prevent the water in the mixture from being soaked up by the soil. The water stays in the concrete, making it stronger. Sourced from the Library of Congress.

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