Influence of key cement chemical parameters on the properties of metakaolin blended cements

Abstract The use of metakaolin (MK) as a mineral admixture for cement and concrete is a well-documented practice. The properties of cement pastes and mortars containing MK have been investigated as a function of key cement chemical parameters recognized as potential activators of the MK. Rheological behavior, initial setting time and compressive strength development have been compared by varying the total sulfate content, the nature of the added calcium sulfate and the free lime content (in the form of portlandite) in the cement. The results obtained indicate that it exists a compromise for the ratio performance/consistency in term of sulfate content and nature. Concurrently, a small addition of portlandite improves the consistency of the properties investigated.

[1]  M. Murat.  Hydration reaction and hardening of calcined clays and related minerals , 1983 .

[2]  Leslie J. Struble,et al.  RHEOLOGY OF CEMENT PASTE AND CONCRETE , 1998 .

[3]  F. Glasser,et al.  Pozzolanic activation of metakaolin , 1992 .

[4]  A. Dunster,et al.  The pozzolanic reaction of metakaolinite and its effects on Portland cement hydration , 1993 .

[5]  Clark Clement.  A Scientific Approach to the Use of Thixotropic Cement , 1979 .

[6]  J. Pera,et al.  Microstructure and Porosity of Metakaolin Blended Cements , 1988 .

[7]  S. Wild,et al.  Chemical shrinkage and autogenous shrinkage of Portland cement—metakaolin pastes , 1998 .

[8]  M. Murat.  Hydration reaction and hardening of calcined clays and related minerals. I. Preliminary investigation on metakaolinite , 1983 .

[9]  M. Murat,et al.  Hydration reaction and hardening of calcined clays and related minerals III. Influence of calcination process of kaolinite on mechanical strengths of hardened metakaolinite , 1983 .

[10]  D. Shaw,et al.  Introduction to colloid and surface chemistry , 1970 .

[11]  F. Curcio,et al.  Metakaolin as a pozzolanic microfiller for high-performance mortars , 1998 .

[12]  J. Pera,et al.  Properties of Metakaolin blended cements , 1994 .

[13]  Jean Ambroise,et al.  Investigations on synthetic binders obtained by middle-temperature thermal dissociation of clay minerals , 1986 .

[14]  F. Curcio,et al.  Dilatant Behavior of Superplasticized Cement Pastes Containing Metakaolin , 1998 .

[15]  D. V. Boger,et al.  Direct Yield Stress Measurement with the Vane Method , 1985 .