Experimental Assessment of Fly-ash Stabilized Mixes Exposed to Freezing and Water Immersion

The utilization of fly-ash stabilizers, fly ash from fluidized combustion and other solid products of combustion, and desulphurization arising during the production of electricity have a good potential for use in the roadbed structures of pavement structures. With a lower density and high shear strength, fly ash reduces the ground subsidence and pressure on supporting constructions during the construction of roadbed structures. In the coming years, an increased focus on the use of these materials can be expected with regard to the continuation of the road infrastructure construction. One of the possible factors blocking the use of some types of fly ashes is their relatively little resistance to repeated contact with water and resulting volume changes. Their water sensitivity is well known. Given thenegative properties of fly ash, which occur mainly in repeated contact with water, it was decided to pay attention to the testing of the resistance of these mixes to the combined effect of freezing and water within the experimental activity. Fly-ash stabilized mixes were designed with the use of ashes from two combustion technologies with different contents of binder and also including the influence of selected chemical additives and binders such as lime hydrated or mineral admixtures such as chemomechanically activated dolomitic lime.