Which of the following waterproofing methods is often used for external surfaces of concrete structures?
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A.
Root barriers
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B.
Cavity wall construction
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C.
Membrane waterproofing
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D.
Integral waterproofing
Correct Answer:
C. Membrane waterproofing
Explanation:
The correct answer is Membrane waterproofing.
Membrane waterproofing is a commonly used technique for protecting the exterior surfaces of concrete structures from water ingress. This method involves applying a continuous layer of water-resistant material, such as liquid-applied coatings or pre-formed sheets, to the concrete's surface. By creating an impermeable barrier, it prevents moisture from penetrating the structure, which helps to mitigate potential damage like corrosion of reinforcement steel or structural degradation. This approach is particularly effective for external applications like roofs, foundations, and decks where exposure to rain and groundwater is frequent.
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