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CEM I 42,5 R

CEM I 42,5 R , MKS; CEM I 42,5 R
*) 45S – a class of cement with ordinary early (at 3 days) compressive strength indicated by C

Standard: Actual valid standard is MKC, According to the EN 197-1, this type and strength class of cement is equivalent to  CEM II/A-M  42.5N

Composition: Portland cement - fine grinded hydraulic binding material which is produced by grinding of Portland cement clinker and gypsum, and some grinding additives if necessary. Additives are added to improve the manufacturing or the properties of the cement up to 1% by mass.

Natural gypsum is used as a regulator of the setting time.
According to its mechanical properties, it is suitable even for the most demanding construction work. This kind of cement is especially important for the production of the concrete elements.

Characteristic:

Chemical requirement

Standard requirements

Achieved values 2008

Loss of ignition (no moisture at 105oC) max %

5

1.2

Insoluble residue, max %

3

0.6

SO3 , %

4.5

2.9

Chlorides, max %

0.1

0.005

Residue on 0.09mm sieve, max

5

2.8

Specific surface acc. to Blaine cm2 /g

2400

3260

Volume without pores and cavities, min g/cm2

3

3.12

Setting time
Initial, not before min
Final, not after h

60
10

130
3

Bending strength at 3 days MPa

min 3

5.2

Compressive strength at 3 days MPa

min 14

32

Bending strength at 28 days Mpa

min 5.5

8

Compressive strength at 28 days MPa

min 40

50.6

Soundness (Expansion) mm

max 10

0.9-1.1

 Water demend

 /

 26.5


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