Ordinary Portland cement:1) P.II52.5R, P.II52.5, P.II52.5 (R): high grade concrete, great span bridges and beams2) P.II42.5R, P.II42.5: large area concrete, such as airplane runways, and viaducts3) P.
Ordinary Portland cement:1) P.II52.5R, P.II52.5, P.II52.5 (R): high grade concrete, great span bridges and beams2) P.II42.5R, P.II42.5: large area concrete, such as airplane runways, and viaducts3) P.