Plastic liners for concrete structural elements and the elements and structures produced thereby

A concrete structural element comprising:

• a concrete body substantially defining the element;
• and
• first and second resiliently flexible, synthetic polymeric plastic sheets on a surface of the concrete body, each of the first and second sheets including a pair of opposing, major sides, one major side of each sheet forming an exposed surface of the element, a remaining major side of each sheet facing and intimately contacting the surface of the concrete body, each sheet having a pair of opposing first and second edges extending along a length dimension of the sheet, the length dimension of each sheet being perpendicular to a width dimension of the respective sheet, the width dimension extending between the first and second edges of the respective sheet, each sheet further including first and second connectors projecting transversely to the remaining major side of the sheet and extending respectively along the first and second edges of the sheet, the first connector of the first sheet having a projecting hook portion matingly receiving a suitably configured projecting head portion of the second connector of the second sheet, the engaged first and second connectors projecting from the remaining sides of the first and second sheets into the concrete of the concrete body and the engaged first and second connectors being shaped and embedded sufficiently in the concrete to engage with and at least partially secure the first and second sheets to the concrete body.