“Computational Civil Engineering - "Intersections" International Journal

134 M. Barbuta, D.S. NourThe results on test samples are given in Table 5.In Fig. 6, 7 and 8 are presented the variations of strengths function the cementreplacements for the initial mixture.From Fig.6 it results that for all type of concrete with the increasing of the silicafume replacement the compressive strength also increase. The biggest value is forconcrete type BIII (with crushed stone).From Fig.7 it results that only for the concrete type AI (sort 3-7 of gravel and sort7-16 mm of crushed stone) the increasing of silica fume content will result in anincreasing of the tensile strength by bending.Compressive strengthTensile strength by bendingCompressive strengthN/mmp100806040200IIR-10%IIR-15%AIR-10%AIR-15%BIIIR-10%BIIIR-15%Tensile strength N/mmp76543210IIR-10%IIR-15%AIR-10%AIR-15%BIIIR-10%BIIIR-15%Concrete typeConcrete typeFigure 6. Compressive strength versuscement replacement with SUFFigure 7. Tensile strength versus cementreplacement with SUFSplit tensile strengthCompressive strengthSplit tensile strengthN/mmp86420IIR-10%IIR-15%AIR-10%AIR-15%Concrete typeBIIIR-10%BIIIR-15%Compressive strenthN/mmp100806040200II-650IIR10%AI-650AI-R10%Concrete typeBIII-650BIII-R10%Figura 8. Tensile strength versus cementreplacement with SUFFigura 9. Compressive strength for highcement dosageFor concrete type I the increasing is reduced and for type BIII we observe areduction of the tensile strength by bending.From Fig.8 we can observe that only for type AII concrete we have an increasingof the strength, but for other types, we observe a reduction of the split tensilestrength.