Characteristics of Hardened Concrete Incorporating Cement Kiln Dust (Ckd) and Silica Fume (Sf)

Abstract

In this research characteristics of hardened concrete containing cement kiln dust and silica fume as a partial replacement of cement were studied. These characteristics inclusion on compressive strength, electrical conductivity, water sorptivity and accelerated corrosion, for each mixture X-ray diffraction were carried out for determined mineralogical analysis of the representative concrete sample. Concrete specimens were prepared with different ratios of CKD and constant ratio 15% SF as a partial replacement by weight of cement. The test results had revealed that The use of CKD as partial replacement of cement in combination with SF in concrete were shown best performance than use CKD only. The amount of 20% CKD in the presence 15% SF as a partial replacement by weight of cement were the optimum ratios can be used in concrete mixtures without lower on compressive. At 5%, 10% and 15% CKD with constant 15% SF at frequencies 0.12, 1.0 and 10 kHz, the electrical conductivity were increased with increased CKD amount, whereas beyond 15% CKD efficiency of electrical conductivity were decreased with increase CKD amount at all frequencies. But at (10% to 25%) CKD, sorptivity value were increased with increase CKD amount when comparison with control mixture. The replacing of cement with CKD and SF, giveabout-the same corrosion rate which clear shown from XRD analysis.