Laboratory Investigation of Cement-Stabilized Marginal Lateritic Soil by Crushed Slag–Fly Ash Replacement for Pavement Applications
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 2
Abstract
Road construction consumes vast quantities of high-quality quarry materials. Lateritic soil (LS) is commonly used as a natural resource for subbase and base materials in Thailand. This research aims to study the feasibility of using crushed slag (CS) and fly ash (FA) to improve the physical properties of marginal LS prior to cement (C) stabilization for pavement applications. The pozzolanic materials in CS and FA were found to react with produced by hydration, which results in the formation of cementitious products over time. Geotechnical engineering laboratory tests were conducted to evaluate the possibility of using cement stabilized LS/CS/FA blends as pavement subbase/base materials. The durability of the blends against wetting and drying cycles were also studied. The unconfined compressive strength (UCS) development of the mixtures was examined by using scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses. CS was found to have a high potential for minimizing swelling, which controls the durability of the stabilized material. Based on the specification of the Department of Highways, Thailand, the 3% C samples were found to be suitable as a subbase material when blended with 30% CS replacement and as a base material when blended with CS and FA at and . The CS replacement was found to prolong the service life of stabilized subbases/bases with up to 12 wetting-drying cycles. This research confirms the possibility of incorporating LS/CS/FA in road work applications, with significant environmental benefits.
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Acknowledgments
This was supported by the Thailand Research Fund under the TRF Senior Research Scholar program Grant No. RTA5980005, Suranaree University of Technology and office the Higher Education Commission under NRU Project of Thailand. The authors would like to acknowledge the facility and equipment provided by Faculty of Science and Engineering Kasetsart University, Chalermphrakiat Sakon Nakhon Province Campus, Thailand.
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Journal of Materials in Civil Engineering
Volume 32 • Issue 2 • February 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: Mar 18, 2019
Accepted: Jul 9, 2019
Published online: Dec 8, 2019
Published in print: Feb 1, 2020
Discussion open until: May 8, 2020
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