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Analysing the effect of adding lime and fly ash to soil and determining the shear strength parameters using unconfined compression test and indirect tensile strength test

Tchong, Josefa Margarida Da Costa (2014). Analysing the effect of adding lime and fly ash to soil and determining the shear strength parameters using unconfined compression test and indirect tensile strength test. Bachelor of Engineering (4th Year Project) Thesis, Charles Darwin University.

Document type: Thesis
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Author Tchong, Josefa Margarida Da Costa
Title Analysing the effect of adding lime and fly ash to soil and determining the shear strength parameters using unconfined compression test and indirect tensile strength test
Institution Charles Darwin University
Publication Date 2014
Thesis Type Bachelor of Engineering (4th Year Project)
Subjects 0906 - Electrical and Electronic Engineering
Abstract The work of civil engineering often faces environmental and infrastructure challenges. An alternative and simplified criterion is presented to explore the validity of using indirect tensile strength and unconfined compression tests to derive the shear strength parameters, cohesion and friction angle, of lightly stabilised clayey gravelly sand. The binders used were lime and fly ash at 0%, 1.5% L/3% FA, 2.5% L/5% FA, 4% L/8% FA and 5% L/10% FA. This criterion was recently developed to determine the shear strength properties of rocks and lightly granular material stabilised with slag lime. This is because the usual Triaxial test is expensive and cumbersome to perform. The experiments will also indicate whether the addition of these supplementary cementitious materials have improved the shear strength parameters. Cohesion and friction angle are two key parameters required for numerical analysis and design of various civil and geotechnical structures. The shear strength parameters are related to the indirect tensile strength, σt, and the unconfined compressive strength, σc. These values will be used to find the cohesion and friction angle using the theoretical framework developed. To validate the criterion, results will be compared with the shear strength parameters produced by unconsolidated undrained Triaxial tests. It was shown that due to the limitations of the alternative method, a majority of the shear strength parameters could not be determined. However, for those that were, demonstrated that the alternative method was validated. It was also shown that the most suitable LFA proporation was 4% L/8% FA. This was shown by the data obtained from the UC and IDT tests, as well as the triaxial tests.
Keyword IDT strength
UCS
triaxial test
cohesion
friction angle
stabilisation
fly ash
lime
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Created: Tue, 12 Aug 2014, 10:19:48 CST