Stabilization of recycled base materials with high carbon fly ash

Abstract

A study was conducted to stabilize low stiffness road surface material with high carbon fly ash. The non-cementitious Maryland fly ash was activated with another recycled material, lime kiln dust (LKD). California bearing ratio (CBR) and resilient modulus tests were conducted to determine the strength and stiffness, respectively, of the stabilized materials. Addition of LKD and curing of specimens generally increased CBR and summary resilient modulus (SM R ) and lowered plastic strains, whereas fly ash addition alone decreased the strength and stiffness due to the non-cementitious nature of the ash.CBR increased with increasing CaO content as well as with CaO/SiO 2 and CaO/(SiO 2 + Al 2 O 3 ) ratio of the mixtures; however, these parameters could not be correlated with the SM R . The unpaved road materials stabilized with LKD and fly ash is expected to lose 31 to 67% of their initial moduli after twelve cycles of freezing and thawing. Finally, required base thicknesses were calculated using the laboratory-based strength parameters. STABILIZATION OF RECYLED BASE MATERIALS WITH HIGH CARBON FLY ASH

Usage of Fly Ash and Waste Slime Boron for Soil Stabilization

“…The reason for the increase in the optimum water content is an increase in the particle surface area of samples due to the addition of finer materials. Similar trends have been obtained from some experimental works [3,4,5,6,7].…”

“…There are a lot of studies about fly ash used in the stabilization of soils. In the previous studies [2,3,4,5,6,7] it was indicated that the engineering properties of fly ash amended soils have been improved. Generally, fly ash was used together with different additive materials like cement, lime or industrial wastes like marble dust, cement kiln dust, etc.…”

Mixing of Fly Ash with Coal Mine Overburden to Increase the Slope Stability

“…This reaction of fly ash with lime in concrete improves strength. Cetin et al [11] reported that the CBR value of the soil stabilized with fly ash (10% and 20%) and lime kiln dust (2.5% and 5%) were found to be In the same way, alternate layers of fly ash overburden admixture and overburden only was filled in the void. Thus, each layer of admixture of fly ash overburden was followed by a layer of overburden.…”

Effects of extraction methods and factors on leaching of metals from recycled concrete aggregates

“…The use of recycle materials in pavement systems in lieu of natural aggregates has been an interest for some time (Tanyu et al 2005;Li et al 2009;Cetin et al 2010). Crushed waste concrete, termed recycled concrete aggregate (RCA), is also considered as an alternative material to be used in roadway construction (Chen et al 2013).…”