Dissertation/Thesis Abstract

Stabilization of recyled base materials with high carbon fly ash
by Cetin, Bora, M.S., University of Maryland, College Park, 2009, 97; 1469456
Abstract (Summary)

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 (SMR) 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/SiO2 and CaO/(SiO2 + Al2O3) ratio of the mixtures; however, these parameters could not be correlated with the SMR. 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.

Indexing (document details)
Advisor: Aydilek, Ahmet H.
Commitee: Aggour, Sherif M., Goodings, Deborah J.
School: University of Maryland, College Park
Department: Civil Engineering
School Location: United States -- Maryland
Source: MAI 48/01M, Masters Abstracts International
Subjects: Civil engineering
Keywords: Base course, Fly ash, Highways, Lime kiln dust, Soil stabilization
Publication Number: 1469456
ISBN: 978-1-109-38322-5
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