Effects of Cement Kiln Dust on the Properties of Pervious Concrete

Pervious concrete is an ideal tool of sustainable development because of its environmental benefits. It composed of cement, course aggregate, water and admixtures. In this study, cement kiln dust (CKD) was used to replace. Six mixes were prepared by replacing of cement with 0%, 10 %, 20 %, 30%, 40%, and 50% of CKD. 0.36 W/C ratio and 10-20 mm size aggregate were used in this experimental investigation. Super-plasticizer admixture was used at constant quantity to ease the placing and handing of pervious concrete mixtures. The aim of proposed work was to assess the suitability of utilizing cement kiln dust (CKD) as partial replacement of cement in the production of pervious concrete to be used as paving materials. The effects of cement kiln dust (CKD) the properties of pervious concrete were investigated by conducting compressive strength test, split tensile strength test, permeability test, water absorption test and durability (sodium chloride solution) test,. Based on the experimental results, it was found that the compressive and split tensile strength increase when replacing the cement with 10% CKD. It was found that replacing the cement with CKD beyond 20% showed a gradual reduction in both compressive and split tensile strengths. Permeability coefficient also showed a gradual reduction in the results with the increment of CKD replacement. The water absorption results showed that replacing the cement with CKD increases the water absorption of pervious concrete. Durability % in terms of weight loss showed that % values of durability were increased when the cement is replaced with CKD. It was concluded that the cement kiln dust can be used to replace the cement up 50% but the effective replacement of these materials is up 20% with increased strength with a slight reduction on the permeability of pervious concrete.