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Effect of optimum utilization of silica fume and cockle shell ash on the engineering properties of soft kaolin clay / Nik Noor Atyrah Nik Aziz

By:

Nik Noor Atyrah Nik Aziz [author.]

Material type: Text

text

Media type:

unmediated

Carrier type:

volume

ISBN:

THE0010804 (Local)

Subject(s):

Dissertation note: Thesis (Master of Science) -- Universiti Malaysia Pahang Al Sultan Abdullah - 2026 Abstract: Soft clay is a challenging soil due to its low strength and high compressibility, often causing significant engineering and economic problems. This study investigates the use of calcium-rich, cost-effective materials silica fume (SF) and cockle shell ash (CSA)to improve the engineering properties of kaolin clay. Laboratory tests conducted included specific gravity, Atterberg limits, compaction, particle size distribution, permeability, unconfined compression, unconsolidated undrained (UU) triaxial tests, energy dispersive X-ray spectroscopy (EDX), and scanning electron microscopy (SEM). Kaolin clay wasinitially stabilized with SF at 2%, 4%, and 6% to identify the optimum SF content basedon undrained shear strength (USS). CSA was then added at 3%, 6%, and 9% to theoptimal SF mix. Samples were cured for 1, 7, 14, and 30 days. Results indicate that addingCSA to SF-stabilized kaolin decreased specific gravity, plasticity index, and maximumdry density, while increasing optimum moisture content and USS. The optimal blend, 6%SF + 9% CSA (K6SF9CSA), achieved a 102.16% increase in USS after 30 days, withUU tests recording the highest cohesion (53 kPa) and friction angle (22.05°). Thesefindings demonstrate that SF and CSA combinations can serve as effective, sustainable,and economical stabilizers for soft kaolin clay, offering significant improvements instrength and mechanical performance.

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Holdings ( 2 )
Title notes ( 4 )

Holdings
Item type	Current library	Collection	Call number	Copy number	Status	Date due	Barcode
Thesis	UMPLIB GAMBANG	Reference	FTKA .A89 2026 r Thesis (Browse shelf(Opens below))	1	In Transit		T000005656
Accompanying Material	UMPLIB GAMBANG	Reference	CD14067 (Browse shelf(Opens below))	1	In Transit		T000005657

Faculty of Civil Engineering Technology

Thesis (Master of Science) -- Universiti Malaysia Pahang Al Sultan Abdullah - 2026

Includes bibliographical references

Soft clay is a challenging soil due to its low strength and high compressibility, often causing significant engineering and economic problems. This study investigates the use of calcium-rich, cost-effective materials silica fume (SF) and cockle shell ash (CSA)to improve the engineering properties of kaolin clay. Laboratory tests conducted included specific gravity, Atterberg limits, compaction, particle size distribution, permeability, unconfined compression, unconsolidated undrained (UU) triaxial tests, energy dispersive X-ray spectroscopy (EDX), and scanning electron microscopy (SEM). Kaolin clay wasinitially stabilized with SF at 2%, 4%, and 6% to identify the optimum SF content basedon undrained shear strength (USS). CSA was then added at 3%, 6%, and 9% to theoptimal SF mix. Samples were cured for 1, 7, 14, and 30 days. Results indicate that addingCSA to SF-stabilized kaolin decreased specific gravity, plasticity index, and maximumdry density, while increasing optimum moisture content and USS. The optimal blend, 6%SF + 9% CSA (K6SF9CSA), achieved a 102.16% increase in USS after 30 days, withUU tests recording the highest cohesion (53 kPa) and friction angle (22.05°). Thesefindings demonstrate that SF and CSA combinations can serve as effective, sustainable,and economical stabilizers for soft kaolin clay, offering significant improvements instrength and mechanical performance.