Effect of Fiber and Cement Additives on the Small-Strain Stiffness Behavior of Toyoura Sand

Muhammad Safdar, Tim Newson, Colin Schmidt, Kenichi Sato, Takuro Fujikawa and Faheem Shah
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Muhammad Safdar: Earthquake Engineering Center, University of Engineering and Technology Peshawar, Peshawar 25000, Pakistan
Tim Newson: Department of Civil and Environmental Engineering, Western University, London, ON N6A 3K7, Canada
Colin Schmidt: Thurber Engineering Ltd. 180, 7330 Fisher Street SE, Calgary, AB T2H 2H8, Canada
Kenichi Sato: Department of Civil Engineering, Fukuoka University, 8-19-1 Nanakuma, Jonan, Fukuoka 814-0180, Japan
Takuro Fujikawa: Department of Civil Engineering, Fukuoka University, 8-19-1 Nanakuma, Jonan, Fukuoka 814-0180, Japan
Faheem Shah: Earthquake Engineering Center, University of Engineering and Technology Peshawar, Peshawar 25000, Pakistan

Sustainability, 2020, vol. 12, issue 24, 1-17

Abstract: The disposal of 2011 Japan earthquake waste has become an important issue in Japan and it is not realistic or economical to send all of these wastes to landfill sites, due to limited space, high costs, and related environmental issues. In sustainable geotechnical applications, mixing of the separated soils from disaster wastes with additives (e.g., cement and fiber) is required to improve their strength and stiffness characteristics. In this study, monotonic triaxial drained compression tests are performed on medium dense specimens of Toyoura sand-cement-fiber mixtures with different percentages of fiber and cement (e.g., 0–3%) additives. The experimental results indicate that behavior of the mixtures is significantly affected by the concentration of fiber and cement additives. Based on a comprehensive set of test results, modifications to the series of equations were developed that can be used to evaluate the shear modulus and mobilized stress curves at small-strain levels. The experimental results and model comparison show that the elastic threshold strain ( γ e ), reference strain ( γ r ), increases with fiber and cement additives. In addition, the range of curvature parameter, from 0.88 to 1.0, provides a good comparison with the results of small-strain measurements. Overall, the comparison of the results and model shows that the small-strain measurements obtained using local strain transducers fall within the range of model upper and lower bound curves. The results of the unreinforced, fiber, and cemented sand shows a close agreement with the model mean curve, but fiber-reinforced cemented sand shows a good comparison with model upper bound.

Keywords: small-strain stiffness; ground improvement; ground remediation; local strain; triaxial test (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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