Resistance to Sulfuric Acid Attacks of Self-Consolidating Concrete: Effect Metakaolin and Various Cements Types
Due to their fluidity and simplicity of use, self-compacting concretes (SCCs) have undeniable advantages. In recent years, the role of metakaolin as a one of pozzolanic materials in concrete has been considered by researchers. It can modify various properties of concrete, due to high pozzolanic reactions and also makes a denser microstructure. The objective of this paper is to examine the influence of three type of Portland cement and metakaolin on fresh state, compressive strength and sulfuric acid attacks in self- consolidating concrete at early age up to 90 days of curing in lime water. Six concrete mixtures were prepared with three types of different cement as Portland cement type II, Portland Slag Cement (PSC), Pozzolanic Portland Cement (PPC) and 15% substitution of metakaolin by every cement. The results show that the metakaolin admixture increases the viscosity and the demand amount of superplasticizer. According to the compressive strength results, the highest value of compressive strength was achieved for PSC and without any metakaolin at age of 90 days. Conversely, the lowest level of compressive strength at all ages of conservation was obtained for PPC and containing 15% metakaolin. According to this study, the total substitution of PSC and PPC by Portland cement type II is beneficial to the increasing in the chemical resistance of the SCC with respect to the sulfuric acid attack. On the other hand, this increase is more noticeable by the use of 15% of metakaolin. Therefore, it can be concluded that metakaolin has a positive effect on the chemical resistance of SCC containing of Portland cement type II, PSC, and PPC.
 Samimi K (2016) Contribution to the study of the durability of BAPs in aggressive environments: effects of natural pozzolans. Dissertation, France: INSA de Rennes.
 Mehta, P. K., Monteiro, P. J. M., « concrete: Structure, Properties and Materials», Englewood Cliffs, NJ; Prentice Hall, 548, 1993.
 Oueslati OLFA., «Durabilité des matériaux cimentaires soumis aux acides organiques, résistance chimique, mécanique et de corrosion», Thèse de doctorat, l’Université Laval, 2011.
 Lide D. R., Handbook of Chemistry and Physics, CRC Press, Inc., 72nd edition, 1991-1992.
 Baron J., Ollivier J. P., La durabilité des Bétons, Presses de l’école nationale des ponts et chaussées, Paris, 1992.
 Paiva H, Esteves L. P, Cachim PB, Ferreira VM. Rheology and hardened properties of single-coat render mortars with different types of water retaining agents. Construction and Building Materials. 2009 Feb 28;23(2):1141-6.