Reuse of dredged sediments as pavement materials by cement kiln dust and lime treatment
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Author list: Yoobanpot N., Jamsawang P., Krairan K., Jongpradist P., Horpibulsuk S.
Publisher: Techno Press
Publication year: 2018
Volume number: 15
Issue number: 4
Start page: 1005
End page: 1016
Number of pages: 12
ISSN: 2005-307X
eISSN: 2005-307X
Languages: English-Great Britain (EN-GB)
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Abstract
This paper presents an investigation on the properties of two types of cement kiln dust (CKD)-stabilized dredged sediments, silt and clay with a comparison to hydrated lime stabilization. Unconfined compressive strength (UCS) and California bearing ratio (CBR) tests were conducted to examine the optimal stabilizer content and classify the type of highway material. A strength development model of treated dredged sediments was performed. The influences of various stabilizer types and sediment types on UCS were interpreted with the aid of microstructural observations, including X-ray diffraction and scanning electron microscopy analysis. The results of the tests revealed that 6% of lime by dry weight can be suggested as optimal content for the improvement of clay and silt as selected materials. For CKD-stabilized sediment as soil cement subbase material, the use of 8% CKD was suggested as optimal content for clay, whereas 6% CKD was recommended for silt; the overall CBR value agreed with the UCS test. The reaction products calcium silicate hydrate and ettringite are the controlling mechanisms for the mechanical performance of CKD-stabilized sediments, whereas calcium aluminate hydrate is the control for lime-stabilized sediments. These results will contribute to the use of CKD as a sustainable and novel stabilizer for lime in highway material applications. ฉ 2018 Techno-Press, Ltd.
Keywords
Cement kiln dust, Dredged sediment
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