DURABILITY ASPECTS OF CEM II/B-M WITH BLASTFURNACE SLAG AND LIMESTONE

The cement standard EN 197-1 allows the production of CEM II/B-M cements with nine different main constituents. The production of cements with the most of the possible combinations is still not common. For this reason, practical experiences with respect to the durability of concretes with these types of cements are very rare. The aim of the studies was to use CEM II/B-M-cements with blastfurnace slag and limestone in all exposure classes according to EN 206-2. Therefore, cements were produced using two types of Portland cement clinker (high and low alkali content), three blastfurnace slags with different aluminium content and basicity, and shell-lime, chalk and Devon limestone. The cements were produced with 15% slag and 20% limestone and 25% slag and 10% limestone. This paper describes the result for carbonation, strength development, freeze-thaw-resistance with and without salt, chloride migration, chemical resistance against ammonium and carbonic acid. The results show a good workability of the fresh concretes. The strength development up to 90 days and the freeze-thaw-resistance without salt is comparable with the reference concretes. The results of the freeze-thaw-resistance-tests with salt meet all requirements, but with the higher limestone-contents the scaling is higher as the scaling of the reference concretes.

• INTRODUCTION

• EXPERIMENTAL DETAILS

• RESULTS AND DISCUSSION

• CONCLUSIONS

• REFERENCES