1. –Mineral Admixture –Ordinary Portland Cement (P.O) –Portland granulated Blast-furnance-slag Cement (P.S) –Portland-Pozzlana Cement (P.P) –Portland fly-ash cement (P.F) –Composite Portland Cement (P.C) Chapter 3 Cement § 3.3 Portland Cement With Mineral Materials

2. Ordinary Portland Cement Introduction Technical Properties Strength demand Application

3. What is Ordinary Portland Cement Ordinary Portland Cement is the hydraulic cementing material. It is made by grinding a few mixing materials and proper gypsum. The maximum quantity of mixing materials should be no less than 15%. Clinker Mixing materials Gypsum Grinding Hydraulic cementing material cementing material P.O

4. Technical Properties  Sieve residue ≯ 10%  Measure the screening rate of the square mesh sieve with 0.08mm  Screening Method  Negative pressure  Negative pressure Sieving method Water pressure sieving method  Water pressure sieving method  Dry sieving  Dry sieving method

5. Technical Properties  Strength grades  It can be classified into 6 strength grades :32.5, 32.5R, 42.5R, 42.5, 52.5, 52.5R  Requirements of strength are in the following table.  Final setting time can not exceed 10h

6. Technical Properties Other requirements of technical properties and range of applications are same with Portland cement. The mineral compound is in the range of Portland cement for a few quantity of mixing materials.

7. Strength grade Compression strength (MPa) Fracture strength （ MPa ） 3d28d 3d 28d 32.5 32.5R 42.5 42.5R 52.5 52.5R 11.0 16.0 21.0 22.0 26.0 32.5 42.5 52.5 2.5 3.5 4.0 5.0 5.5 6.5 7.0 Tab.3.3.1 Strength Demand of Ordinary Portland Cement

8. Application of P. O It is the main type of common cement and mainly used in the project of concrete and reinforced concrete. The application range is the same with Portland cement.