Effect of sodium sulfate in a mortar incorporating metakaolin

F. Saidat, M. Cyr, M. Mouret, R. Idir

Abstract


Abstract: Metakaolin is a pozzolanic addition, it was developed as a partial substitution of cement to reduce cement consumption and improve the durability of concrete. However, the incorporation of metakaolin introduces, at early age, a lack of mechanical performance of concretes at room temperature.This work aims to chemically activate metakaolin in cement past in such a way that, the same early age performance can be achieved in concrete as achieved without metakaolin. The study was carried out at cement mortar to observe the influence of sodium sulfates on compressive strength. The increase in resistance at early age was observed with the activation of metakaolin. The metakaolin activation was confirmed in cement matrices by physio-chemical analyses. The increase in compressive strength at early age can be explained by a decrease of porosity and setting time, an increase in the amount of C-S-H and a decrease in the amount of CH.

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References


Bich, C. Contribution à l’étude de l’activation thermique du kaolin : évolution de la structure cristallographique et activité pouzzolanique. Thèse de doctorat, Université de Lyon (2005).

Khatib J.M.; Clay R.M.; Absorption characteristics of metakaolin concrete. Cement and Concrete Research 34 (2004) 19-29.

Cyr, M.; Trinh, M.; Husson, B.; Casaux-Ginestet, G. Effect of cement type on metakaolin efficiency. Cement and Concrete Research 64(2014) 63-72.

De Silva, P.S.; Glasser, F.P. Pozzolanic activation of metakaolin. Advanced in Cement Research 4(1992) 167-178.

De Silva, P. S. ; Glasser, F. P. Phase relations in the system CaO-Al2O3-SiO2-H2O relevant to metakaolin-calcium hydroxide hydration. Cement and Concrete Research 23 (1993) 627-639.

Erdogan, S.T.; Saglik, A. Early-age activation of cement pastes and mortars containing ground perlite as a pozzolan. Cement and Concrete Composites 38(2013) 29-39.

Frias, M.; Cabrera, J. Pore size distribution and degree oh hydration of metakaolin-cement pastes. Cement and Concrete Research 30(2000) 561-569.

Lorenzo, M. P.; Goni, S. Activation of pozzolanic reaction of hydrated portland cement fly ash pastes in sulfate solution. Journal of the American Ceramic Society 85 (2002) 3071-3075.

Marciano, E.; Battagin ,A.F. The influence of alkali activator on the early hydration and performance of Portland blast furnace slag cement. In Proceedings of the 10th international congress on the chemistry of cement, Gothenburg, Sweden, June 2-6(1997) 3: 3ii103- 4.

Murat, M. Hydration reaction and hardening of calcined clays and related minerals: II- Influence of mineralogical properties of the raw kaolinite on the reactivity of metakaolonite. Cement and Concrete Research 13(1983) 511-518.

Qian, J.; Shi, C.; Wang, Z. Activation of blended cements containing fly ash. Cement and Concrete Research 31(2001) 1121-1127.

Saidat, F.; Mouret, M.; Cyr, M. Chemical activation of metakaolin in cement-based materials. In: 10th International Conference on Superplasticizers and Other Chemical Admixtures in Concrete. Prague (Czech Republic) October (2012) 28-31.

Saidat, F. Activation chimique de métakaolin dans une matrice cimentaire. Thèse de Doctorat. Université de Toulouse (2013).

San Nicolas, R. Approche performantielle des bétons avec métakaolins obtenus par calnination flash. Thèse de Doctorat. Université de Toulouse(2011).

Shi, C.; Qian J. High performance cementing materials from industrial slags A review. Resources Conservation and Recycling 29 (2000) 195-207.

Singh, N.; Rai, S.; Singh, N. B. Effect of sodium sulphate on the hydration of granulated blast furnace slag blended Portland cement. Indian Journal of Engineering and Materials Sciences 8(2001) 110-113.

Trinh, Q.M. Utilisation du métakaolin par substitution partielle du ciment dans les applications géotechniques d'injection et de scellement d'ancrage. Thèse de Doctorat. Université de Toulouse (2012).

Verbeck, G.J.; Helmuth, R.H. Structures and physical properties of cement paste. Proceedings of 5th Internnational Symposium. Chemistry. Cement, Tokyo 3(1969)1-44.


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