| Abstract | The aim of this research is to know influence of addition silica fume and variation of waterÃÂÃÂ cement ratio (w/c), also interaction of between both to elasticity modulus of concrete.ÃÂÃÂ Independent variable in this research is variation of silica fume and water cement ratio.ÃÂÃÂ Dependent variable is compression strength and strain for result of elasticity modulus. TheÃÂÃÂ sample test of cylinder concrete with diameter 15 cm and high 30 cm, with the variation of w/cÃÂÃÂ 0,3 ; 0,35 ; 0,4 ; 0,45 ; and 0,5, and also variation of silica fume 0,5%, 10%, 15%, and 20%ÃÂÃÂ cement weight. Each treatment made by 10 samples with of volume comparison of mixerÃÂÃÂ concrete 1 : 1,5 : 2,5. The result of samples test carried out 28thÃÂÃÂ days of age obtained optimumÃÂÃÂ rate silica fume 9,328% with w/c 0,35 giving influence to increase of concrete elasticity modulusÃÂÃÂ of concrete to 4,191% of normal concrete |
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