Title : UTILIZATION OF BACTERIAL TREATED CEMENT KILN DUST IN CONCRETE
Authors : Kunal1*, Rafat Siddique2 and Anita Rajor1
Publication : 23 - 26 October 2013
Volume :
Pages :
Price : 250
Abstract : Cement kiln dust (CKD) is a fine particulate material generated as a by-product during cement production. Several studies reported the use of CKD as cementitious material but high alkalinity reduces the quality and strength of cement paste and has adverse influence on concrete properties. Study was conducted to reduce the alkalinity of CKD by biological means (treatment with bacteria) and its utilization in concrete as partial replacement to cement (0, 10 and 20%). The effect of bacterial treated CKD was assessed on the compressive strength, water absorption and porosity of concrete at the age of 91 days. Test results showed 26.7% increase in compressive strength and reduction in water absorption (20%) and porosity (12.35%) in 10% bacterial treated CKD-concrete compared to control concrete (0% CKD). X-ray diffraction (XRD) results revealed increased formation of calcium silicate gel and non-expansive ettringite in the pores of 10% bacterial treated CKD-concrete structures