Concrete Permeability as affected by Using Egyptian Local and Pozzolanic Materials.

Abstract

This research presents the effect of using combination of silica fume (SF) and super plasticizer such as addicrete DM2 and addicrete BVF with Portland cement (EL-Mohandes Asyut Cement 42.5) and the effect of using of silica fume (SF), Metakaolin (MK) and addicrete DM2 with Pozzolanic cement (Asyut Pozzolanic Cement 42.5) on the permeability of concrete using three types of gravel red gravel (Natural size and Small size) and white gravel and two types of sand from two different mountain. Series of concrete mixes with compressive strength of 25 MPa with variable water to cement ratio and different doses of SF, MK, addicrete DM2 and addicrete BVF were prepared and tested. The compression, bond, splitting tension, and water absorption tests for different concrete specimens were carried out. The results showed that using combination of silica fume, metakaolin and super plasticizer in the concrete mix improves the properties of hardened concrete, especially concrete permeability. The optimum doses of SF, MK and super plasticizer such as addicrete DM2 and addicrete BVF were 14.3, 15, 0.3, and 2.2% respectively by weight of cement. Optimum doe of local materials SF and MK in this research equal to 14.3% and 15% by weight of cement. Also, optimum dose of super plasticizer type DM2 and BVF were 0.3% and 2.2% by weight of cement at which occurs maximum compressive strength of concrete.

Keywords

• metakaolin
• water permeability of concrete
• addicrete dm2
• addicrete bvf
• silica fume