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Cement
Ordinary Portland cement:<br>1) P.II52.5R, P.II52.5, P.II52.5 (R): high grade concrete, great span bridges and beams<br>2) P.II42.5R, P.II42.5: large area concrete, such as airplane runways, and viaducts<br>3) P.O42.5R, P.O42.5, P.L42.5, P.C42.5: bridges, roadways, high-rise buildings, normal industry and living buildings<br>4) P.O32.5, P.C32.5, P.L32.5: normal industry and living buildings<br>5) Portland cement with sulfate resistance: seaports, water conservancy, and subterranean water conservancy<br>6) Road Portland cement: high level roadways, freeways, airline runways, and projects requiring for high friction and shrink resistance<br>7) Middle-heat and low-heat Portland cement: mass concrete projects, e.g. dams
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