S. Guettala and B. Mezghiche
Effect of Addition the Dune Sand Powder on Development of Compressive Strength and Hydration of Cement Pastes
792 - 798
2012
6
10
International Journal of Civil and Environmental Engineering
https://publications.waset.org/pdf/13574
https://publications.waset.org/vol/70
World Academy of Science, Engineering and Technology
In this paper, the effect of addition the dune sand powder (DSP) on development of compressive strength and hydration of cement pastes was investigated as a function of waterbinder ratio, was varied, on the one hand, the percentage of DSP and on the other, the fineness of DSP. In order to understand better the pozzolanic effect of dune sand powder in cement pastes, we followed the mixtures hydration (50 Pure Lime 50 DSP) by Xray diffraction. These mixtures the pastes present a hydraulic setting which is due to the formation of a CSH phase (calcium silicate hydrate). The latter is semicrystallized. This study is a simplified approach to that of the mixtures (80 ordinary Portland cement 20 DSP), in which the main reaction is the fixing of the lime coming from the cement hydration in the presence of DSP, to form calcium silicate hydrate semicrystallized of second generation. The results proved that up to (20 DSP) as Portland cement replacement could be used with a fineness of 4000 cm²g without affecting adversely the compressive strength. After 28 days, the compressive strength at 5, 10 and 15 DSP is superior to Portland cement, with an optimum effect for a percentage of the order of 5 to 10 irrespective of the wb ratio and fineness of DSP.
Open Science Index 70, 2012