Characterization of sustainable high performance/self-compacting concrete produced using CKD as a cement replacement material

• CKD incorporation decreases strength and rheological properties.
• Damping of concrete increases with CKD increase.
• Image analysis technique can be used in determining 2D concrete porosity.
• CKD can be used as a cement replacement material in producing SCC.

The aim of this study was to investigate the use Cement Kiln Dust CKD as a cement replacement material in producing high performance/self-compacting concrete. Different percentages of replacement by cement weight were tried including 10%, 20%, and 30% with keeping other constituents content constant. In order to characterize the structurally use of the produced concrete in civil infrastructure applications, the rheological and some key mechanical properties were investigated in addition to some dynamic/damping properties. The results showed that there was a progressive decrease in flowability and mechanical strength properties with increasing CKD replacement. However, high strength self-compacting concrete could be produced with up to 20% wt. CKD replacement while high performance/self compacting concrete was obtained with 30% wt. CKD replacement. CKD incorporation led to decrease the dynamic modulus of elasticity in parallel with increase the damping capacity. The final conclusion is that CKD can be used as a cement replacement material in producing high strength/high performance self-compacting concrete if the strength and rheology of the produced concrete is considered.