Transcript Chapter 3 Cement §3.3 Portland Cement With Mineral Materials – Mineral Admixture – Ordinary Portland Cement (P.O) – Portland granulated Blast-furnance-slag Cement (P.S) – Portland-Pozzlana Cement (P.P) –

Chapter 3 Cement
§3.3 Portland Cement With Mineral
Materials
– 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)
Ordinary Portland Cement
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Introduction
Technical Properties
Strength demand
Application
What is Ordinary Portland Cement
Mixing
materials
P.O
Grinding
Clinker
Gypsum
Hydraulic
cementing material
• 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%.
Technical Properties
Sieve residue ≯10%
Measure the screening rate of the
square mesh sieve with 0.08mm
Screening Method
Negative pressure Sieving method
 Water pressure sieving method
 Dry sieving method
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
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.
Tab.3.3.1 Strength Demand of
Ordinary Portland Cement
Strength
grade
32.5
32.5R
42.5
42.5R
52.5
52.5R
Compression
strength (MPa)
Fracture strength
（MPa）
3d
28d
3d
28d
11.0
16.0
16.0
21.0
22.0
26.0
32.5
32.5
42.5
42.5
52.5
52.5
2.5
3.5
3.5
4.0
4.0
5.0
5.5
5.5
6.5
6.5
7.0
7.0
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.