Skip to main content

Ordinary Portland Cement

Ordinary Portland cement (OPC) is by far the most important type of cement. All the
discussions that we have done in the previous chapter and most of the discussions that are going to be done in the coming chapters relate to OPC. Prior to 1987, there was only one grade of OPC which was governed by IS 269-1976. After 1987 higher grade cements were introduced in India. The OPC was classified into three grades, namely 33 grade, 43 grade and 53 grade depending upon the strength of the cement at 28 days when tested as per IS 4031-1988. If the 28 days strength is not less than 33N/mm2, it is called 33 grade cement, if the strength is not less than 43N/mm2, it is called 43 grade cement, and if the strength is not less then 53 N/mm2, it is called 53 grade cement. But the actual strength obtained by these cements at the factory are much higher than the BIS specifications.

Popular posts from this blog

DETAILING OF SIMPLY SUPPORTED BEAM

  DETAILING OF SIMPLY SUPPORTED BEAM

DETAILING OF CANTILEVER BEAM

  DETAILING OF CANTILEVER BEAM

Types of Cement

(a) Ordinary Portland Cement (i) Ordinary Portland Cement 33 Grade– IS 269: 1989 (ii) Ordinary Portland Cement 43 Grade– IS 8112: 1989 (iii) Ordinary Portland Cement 53 Grade– IS 12269: 1987 (b) Rapid Hardening Cement – IS 8041: 1990 (c) Extra Rapid Hardening Cement – – (d) Sulphate Resisting Cement – IS 12330: 1988 (e) Portland Slag Cement – IS 455: 1989 (f) Quick Setting Cement – – (g) Super Sulphated Cement – IS 6909: 1990 (h) Low Heat Cement – IS 12600: 1989 (j) Portland Pozzolana Cement – IS 1489 (Part I) 1991 (fly ash based) – IS 1489 (Part II) 1991 (calcined clay based) (k) Air Entraining Cement – – (l) Coloured Cement: White Cement – IS 8042: 1989 (m) Hydrophobic Cement – IS 8043: 1991 (n) Masonry Cement – IS 3466: 1988 (o) Expansive Cement – – (p) Oil Well Cement – IS 8229: 1986 (q) Rediset Cement – – (r) Concrete Sleeper grade Cement – IRS-T40: 1985 (s) High Alumina Cement – IS 6452: 1989 (t) Very High Strength Cement – –