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Advances in Concrete Construction
  Volume 6, Number 3, June 2018 , pages 297-309

Modeling of ultimate value and kinetic of compressive strength and hydration heat of concrete made with different replacement rates of silica fume and w/b ratios
Mahdjoub Djezzar, Karim Ezziane, Abdelkader Kadri and El-Hadj Kadri

    The objective of this study was to evaluate the influence of silica fume (SF) on the hydration heat and compressive strength of concrete. Portland cement with w/(c+sf) ratios varying between 0.25 to 0.45 was substituted by 10%, 20% and 30% of SF by mass. A superplasticizer was used to maintain a fluid consistency of the concrete. The heat of hydration was monitored continuously by a semi-adiabatic calorimetric method for 10 days at 20oC. Compressive strengths are tested for each mixture until age of 180 days. The results show that silica fume considerably influences the evolution and the ultimate values of the compressive strengths as well as the hydration heat especially for 10% rate. The w/b ratio has a considerable effect where its decrease modifies compressive strength and hydration heat more than silica fume. The correlation of the obtained results allows deducing of ultimate properties as well as the ages to reach half of their values. The correlation coefficients are close to unity and reflect the judicious choice of these relationships to be used to predict compressive strength and hydration heat.
Key Words
    cement; compressive strength; half age; hydration heat; relationship; silica fume; ultimate values
Mahdjoub Djezzar, Karim Ezziane, Abdelkader Kadri: Laboratory Geomaterials, University Hassiba Benbouali of Chlef, 02000, Chlef, Algeria
El-Hadj Kadri: Laboratory L2MGC, University of Cergy Pontoise, F9500, Cergy Pontoise, France

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