微量膠結性顆粒材料之力學行為

Mechanical Behavior of Lightly Cementitious Granular Material

朱秋燕(Sri Ratna Wahyuningsih)

指導教授 ： 葛宇甯

國立臺灣大學/工學院/土木工程學研究所/碩士(2021年)

https://doi.org/10.6342/NTU202102478

摘要

無資料

關鍵字

粒狀材料 ； 土壤改良 ； MICP ； 石膏 ； 人工水泥土 ； 力學行為 ； 壓密實驗 ； 三軸試驗

並列摘要

Engineers from multidiscipline have been developing sustainable soil improvement techniques. In this study, a sustainable improvement technique, which involves bio-mediated process is introduced. This technique is called Microbiological Induced Calcite Precipitation (MICP). The main idea of MICP is that the injected bacteria cause calcite precipitation around particle contact points. This formed calcite fills the void within the soil matrix, cements the particles, and increase the bonding between particles. This results in improvement of soil strength and stiffness. However, because of the MICP complexities, a preliminary study is needed. In this research, an artificial cementing agent, gypsum, was used to learn the behavior of cemented soil.
In this study, fine silica sand was used as the main ingredient. To learn the mechanical behavior, consolidation test and triaxial test were performed on gypsum and MICP specimens. The result of consolidation test showed that the initial void ratio was reduced and less compressible than the uncemented sand. Furthermore, from the triaxial test, it is observed that strength and stiffness increased with the confining pressure, for both specimens. Gypsum and MICP specimens had cohesion value, as expected, due to the cementation between particles, but lower in friction angle, compares to the uncemented sand. This behavior might be as the result of some factors: not enough curing time, saturation process, and the specimens’ non-uniformity.
Considering the result, gypsum may be considered as an alternative material to study MICP behavior. Finally, there is wider scope for further research related to cemented granular material.

並列關鍵字

Granular material ； Soil improvement ； MICP ； Gypsum ； Artificially-cemented soil ； Mechanical behavior ； Consolidation test ； Triaxial Test

參考文獻

Ahmed, K.I. 2013. Effect of Gypsum on the Hydro-Mechanical Characteristics of Partially Saturated Sandy Soil. Geoenvironmental Research Centre, Cardiff School of Engineering.

Al Qabani, A., Soga, K., and Santamarina, C. 2012. Factors Affecting Efficiency of Microbially Induced Calcium Carbonate Precipitation. Journal of Geotechnical Geo-Environmental Engineering 138(8), 992-1001.

Aldaood, A., Bouasker, M., Al-Mukthar, M. 2014. Impact of Wetting-Drying Cycles on the Microstructure and Mechanical Properties of Lime-Stabilized Gypseous Soils. Engineering Geology, 174.

Al-Janabi, A.S. 1990. Using of Ammonium Phospate and Carbonate as Gypsiferous Soil Conditioneers and Their Effect on Growth and Productivity of Corn. Doctoral Thesis, University of Baghdad, Iraq.

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