QGPC
On paper they look similar, but polymer concrete and ordinary reinforced concrete behave very differently once they are in the ground.
Ordinary reinforced concrete relies on Portland cement and steel rebar. Over time, sewage gases (H₂S), chlorides and acids attack the cement and corrode the steel, cracking the structure from the inside and allowing leaks.
Polymer concrete has no cement and no steel. Its resin-bound matrix is non-porous and chemically inert, so it does not corrode, spall or leak — even in aggressive wastewater and saline ground.
On performance, PRC reaches roughly 120 MPa compressive strength while weighing significantly less than precast concrete. It cures in about an hour instead of days, and lasts 100+ years compared with the 10–15 year rehabilitation cycles common for lined concrete.
In short: traditional concrete is cheaper to pour but pays for it in corrosion, maintenance and replacement. PRC costs more up front and far less over the life of the asset.