Browsing by Author "Talah, A."

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    Chemical strength of HPC cured in a sulphate environment
    (2010) Chaid, R.; Jauberthie, R.; Rendell, F.; Talah, A.
    A large variety of sulphates, generally coming from underground water or sea waters, can come into contact with the concrete and react chemically with the hydrates, in particular with aluminates, and cause the cracking and the failure of the concrete. The durability of the concretes in a sulphate environment is normally ensured by a sufficient content of cement and the dense structure of the hydrated paste. The combination of natural pozzolans with portland cement makes possible the development of concretes having mechanical properties and a durability much higher than that of a concrete without addition. In order to better determine the pozzolanic effect of the pozzolan addition in the concrete, the evolution of the crystalline phases have been analyzed using x-ray diffraction analysis examined using scanning electron microscopic techniques including the use of chemical analysis to confirm their chemical composition. In parallel with these tests, the evolution of the mechanical bending and compressive strengths have been observed using an automatic test machine. The present study confirms the pozzolanic reactivity of the natural pozzolans used
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    Influence of marble powder on high performance concrete behavior
    (Elsevier, 2015) Talah, A.; Kharchi, F.; Chaid, R.
    This paper reports an experimental study of the influence of marble powder used as partial substitute for Portland cement (PC) on the mechanical properties and durability of high performance concretes. The analysis of the experimental results on concrete at 15% content of marble powder with a fineness modulus of 11500 cm2/g, in a chloride environment, showed that it contributes positively to the perfection of its mechanical characteristics, its durability with respect to migration of chloride ions and oxygen permeability. On the basis of the experiments performed, it can be concluded that the marble powder is suitable for formulation of high performance concretes (HPC) and their properties are significantly better compared to the reference concrete (RC)