Soft Clay Soil Stabilization By utilizing Cement Kiln Dust, Ceramic Dust Waste and Fly Ash

Abstract

The disposal of industrial waste is a global problem, in addition to the costly process of removing this waste. Likewise, one of the problems with this waste is that it harms the environment. As a result of building materials costs increasing over time, there has been a need to search for the lowest cost and locally available materials. There was also a need to search for a way to convert industrial waste, which is the secondary waste from manufacturing processes, into materials for engineering projects. Cement kiln dust and fly ash waste are secondary waste. Ceramic waste is secondary waste and waste from construction and demolition waste. Soil stabilization utilizing cement kiln dust CKD, fly ash FA and ceramic dust waste CDW is an effective method for stabilizing soft clay soils. Soft clay soils are found in central and southern Iraq. These soils exhibit negative impacts on engineering projects as well as on building structures and highways due to their low strength and high tensile strength. In this paper, the possibility of improving some properties of soft clay soils was studied via utilizing these wastes in proportions (5,10,15) % via means via dry weight of the soil and comparing it with the properties of the original soil.  A program has been put to conduct tests on soil and soil mixed with residues. This program included (specific gravity test GS, x-ray deflection test, unconfined compressive strength test UCS during treatment period (0,3,7,28) days and consolidation test to check compression index Cc, recompression index Cr and coefficient of consolidation Cv.  With the addition of CKD, FA or CDW to the soil, a decrease in GS and compression index Cc, recompression index Cr and an increase in the coefficient of consolidation Cv were observed, in addition to an increase in UCS values. Depending on the results of the tests, the best addition of CKD and FA was 5% via dry soil weight, while the best percentage of CDW addition was 10% via dry soil weight.  Thus, this waste can be used to improve and strengthen the properties of soft clay, and this waste can be used in highway projects.