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Sultan Qaboos University (2020)

Potential use of deep soil mixing technology in stabilizing dune sandy

Al-Shanfari, Hamid Hassan Mohammed Azzan

Titre : Potential use of deep soil mixing technology in stabilizing dune sandy

Auteur : Al-Shanfari, Hamid Hassan Mohammed Azzan.

Université de soutenance : Sultan Qaboos University

Grade : Master of Science (MS) in Civil Engineering 2020

Dune sands belong to the category of problematic soils because of its low strength characteristics, susceptibility to collapse on wetting, low bearing capacity, high permeability, and precludes the support of structures loads and road building. Consequently, it is necessary to stabilize dune sands to take advantage of the vast areas and establish infrastructure. Moreover, roughly no studies were found worldwide for adopting Deep Soil Mixing technology (DSM) in stabilizing dune sand. This research experiment evaluates the deep soil mixing technique’s effectiveness in stabilizing dune sand by developing a laboratory scaled apparatus and investigating particular parameters that influence strength characteristics. Also, an attempt to explore potential stabilize agents as a grout material in DSM such as Cement Kiln Dust (CKD), Nano-Silica and Polymer Eight parameters are studied to evaluate the DSM method on Dune sand : (1) Water/Binder ; (2) Replacement of CKD ; (3) Replacement of Nano ; (4) Replacement of Polymer ; (5) Auger speed ; (6) Penetration speed ; (7) Auger angle ; (8) Cement Content. The selected parameters will be measured by undertaking Unconfined Compressive Strength (UCS) tests at specimens ages of 7, 14, and 28 days. The results reveal that binder content, auger speed, and penetration speed significantly affected increasing UCS. The blade with 40-degree had a better performance than with 20-degree. In comparison to pure OPC binder, all the binders’ combinations of OPC with a replacement of (CKD, Nano-silica, and polymer) are considered an effective sample and can be used in DSM. Lastly, by graphical analysis of the results, functional equations were derived from the results for the UCS of 28-days, the strength for a specific binder dosage, and the secant modulus with acceptable precision, which may be used for prediction of DSM performance in dune sand.

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