Characterization and technical properties of high-performance CSA clinkers

Source/Quelle: Wilhelm Dyckerhoff Institute

1 Well developed prismatic ettringite crystals observed after hydration of a CSA cement paste

Source/Quelle: Wilhelm Dyckerhoff Institute

2 Pilot kiln

3 Granulator plate

4 Clinker pellets during the burning

5 TG analysis of a typical CSA raw meal

6 XRD patterns of low sulphate (S3) and high sulphate (S5) CSA clinker

7 TG analysis of CSA raw meal in the presence of P₂O₅ and CaF₂ doping agents

8 TG analysis of CSA raw meal with low sulphate (S3) and high sulphate (S5) content

9 XRD pattern of a reference CSA clinker and of two doped CSA clinkers, containing respectively P₂O₅ (S6) and CaF₂ (S7)

Source/Quelle: Wilhelm Dyckerhoff Institute

A forming grain of C₄A₃Sˉ prepared at temperature of 1170 °C (left); EDX analysis state that the inner black part is composed of unreacted Al₂O₃, while the external part is CaSO₄; C₄A₃Sˉ is formed in the intermediate zone. Right: A large and a small (>10µm) belite in a CSA clinker

Source/Quelle: Wilhelm Dyckerhoff Institute

The results presented in this paper are a fundamental part of the research work which has allowed Buzzi Unicem to achieve the product commercialisation of a CSA cement on an industrial scale.

The awareness of the social relevance of the protection of the environment has promoted increased attention in the investigation of innovative and more sustainable construction materials. The research for higher sustainability in the building industry is key to the development of innovative binders, regarding the increased interest in the knowledge and use of supplementary cementitious materials (SCMs) in cement, and for the use of alternative fuels during the burning process. The development of an innovative cementitious material requires a great deal of experimental work, testing all aspects...