Kiln-Dust as Partial Replacement of Cement in Concrete

Abstract

This research investigates the strength characteristics of concrete made with cement-kilndust with a view to determine the influence of replacing certain percentage of ordinary Portland cement with kiln-dust in cement kiln-dust concrete. The research was carried out in accordance with British standard BS (812, 882, 1881 and 4550). The kiln-dust was mechanically grounded into powder with grinding machine and sieved with a stack of BS sieve. The powdered kiln-dust was mixed with ordinary Portland cement in three different proportions of 10%, 20% and 30% content of kilndust which was used for experiment. Two hundred and forty 100mmX100mm concrete cubes were casted, cured and crushed including the controls specimens to failure to determine the compressive strength. The result of 28th day compressive strength for 10%, 20% and 30% replacement of OPC with kiln-dust were 27.5N/mm2, 26.66N/mm2 and 26.57N/mm2 respectively. The water cement ratio for the mix proportion was 0.66, 0.75 and 0.87 for 10%, 20% and 30% replacement. The research concludes that OPC can be replaced with 10%, 20% and 30% of kiln-dust content in concrete.