Cement for highest
loads and structures subject to stress

Cement CEM I 42,5R usage

The quality of cements is supervised
by the TSÚS (Building
Testing and Research
Institute), Bratislava.
CEMMAC is a holder of an
ISO 9001: 2008 quality
management certificate
and an ISO 14001: 2004 environmental
management certificate.

CEM I 42,5 R
Portland cement

High-strength pure Portland cement for concretes requiring the highest strengths and a fast form removal or load of the structure, also suitable for concreting in cool weather.


CEM I 42,5 R is characterized by a rapid increase in strengths, attaining high early and final strengths (after 2 days in the range of 29 to 36 MPa, after 28 days from 57 to 62 MPa). During hardening, this manifests itself by a high development of heat of hydration.


  • concretes of high strength classes and concretes where fast demolding is required
  • demanding structures made of reinforced concrete and plain concrete (bridge structures, pillars, etc.)
  • production of prefabricated elements and ready-mixed plasters
  • concrete pavements and concrete surfaces subject to high stress
  • industrial floors
  • all kinds of industrial and civil structures


  • the rapid increase in early strengths enables a
    • quick demolding of products
    • quick walk-on-ability of concrete surfaces
    • quick load of the concretes produced
  • high early and final compressive strengths
  • good workability, colour fastness and low volume changes
  • the high development of heat of hydration enables concreting even in cool weather

Essential properties Harmonized
Standard EN 197-1
CEM I 42,5 R
2-day compressive strength (MPa) => 20 29 – 36
28-day compressive strength (MPa) => 42,5 =< 62,5 57 – 62
Initial setting time (min) => 60 210 +- 30
Volume stability Le-Chatelier (mm) =< 10 0,0 – 1,3
SO3 sulphate content (%) =< 4 3,2 +- 0,2
Chloride content (%) =< 0,1 0,03 – 0,02
The content of tricalcium aluminate in this cement is less than 5%.

Increase in strengths CEM I 42,5 RCement CEM I 42,5R graph