Evaluation of Fly Ash and Clay in Soil Grouting

Improvement of the mechanical and hydraulic properties of soils by grouting is one of the most widely used techniques in soil stabilization. The use of added pozzolanic materials such silica fume, and fly ash as well as clay to improve the physical, mechanical, and fluidity properties of cement grouts has been researched in recent years. In this study, the usage of grout additives fly ash and clay in soil grouting, and the effects of these grouts on soil strength have been researched in laboratory tests. First, grouts with added fly ash and clay in different amounts were prepared, and then these grouts were injected into soil samples. The unconfined compressive strength of grouted samples was determined for 7 and 28 days of curing time. It is shown that fly ash and clay improved fluidity of the grouts. The results of fly ash and clay grouted samples were compared with the cement grouted samples and the test results were evaluated against each other.