Cast iron manhole covers are also an environmentally conscious choice. Their durability means they do not need to be replaced frequently, reducing the material waste associated with urban maintenance. Additionally, cast iron can be recycled, so when a cover’s life eventually comes to an end, it can be repurposed, further minimizing its environmental impact.
(vii) Bituminous Materials: In some cases, bituminous materials like asphalt or bitumen may be used for the base or floor of manholes. These materials provide a smooth surface, help to prevent groundwater infiltration, and offer resistance to chemical attacks.
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