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Geomechanics and Engineering Volume 15, Number 4, July20 2018, pages 1005-1016 DOI: http://dx.doi.org/10.12989/gae.2018.15.4.1005 |
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Reuse of dredged sediments as pavement materials by cement kiln dust and lime treatment |
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Naphol Yoobanpot, Pitthaya Jamsawang, Krissakorn Krairan, Pornkasem Jongpradist and Suksun Horpibulsuk
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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. | ||
| Key Words | ||
| cement kiln dust; dredged sediment; pavement materials; stabilization; strength | ||
| Address | ||
| Naphol Yoobanpot, Pitthaya Jamsawang and Krissakorn Krairan: Soil Engineering Research Center, Department of Civil Engineering, King Mongkut | ||