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Oedometric Behavior of a Diatom-Kaolin Mixture
Natural soil deposits that contain diatom microfossils are found in many locations around the world. These deposits were formed in marine or freshwater depositional environments. The presence of diatom microfossils affects soil properties, such as the water content, Atterberg limits, and density because of the frustules’ very large intraparticle porosity. The presence of frustules within a saturated fine-grained soil matrix may lead to greater or much greater compressibility of the soil; however, the deformation mechanisms are not well understood. This paper presents and discusses the results of oedometer tests on two preconsolidated specimens, one composed of kaolin mixed with 40% diatomite (by dry mass) and another composed solely of crushed diatomite. The oedometric behaviors of the kaolin-diatom mixture and diatomite specimen are compared to consolidation test results on kaolin. Observations are consistent with particle (frustule) breakage as an important component of the vertical deformation and source of irrecoverable deformation during unloading. The results indicate that vertical deformations derived from other mechanisms in addition to primary consolidation in soils with diatom microfossils are dependent on the applied effective stress level.
Oedometric Behavior of a Diatom-Kaolin Mixture
Natural soil deposits that contain diatom microfossils are found in many locations around the world. These deposits were formed in marine or freshwater depositional environments. The presence of diatom microfossils affects soil properties, such as the water content, Atterberg limits, and density because of the frustules’ very large intraparticle porosity. The presence of frustules within a saturated fine-grained soil matrix may lead to greater or much greater compressibility of the soil; however, the deformation mechanisms are not well understood. This paper presents and discusses the results of oedometer tests on two preconsolidated specimens, one composed of kaolin mixed with 40% diatomite (by dry mass) and another composed solely of crushed diatomite. The oedometric behaviors of the kaolin-diatom mixture and diatomite specimen are compared to consolidation test results on kaolin. Observations are consistent with particle (frustule) breakage as an important component of the vertical deformation and source of irrecoverable deformation during unloading. The results indicate that vertical deformations derived from other mechanisms in addition to primary consolidation in soils with diatom microfossils are dependent on the applied effective stress level.
Oedometric Behavior of a Diatom-Kaolin Mixture
Shatnawi, Hend H. Al (author) / Bandini, Paola (author)
Eighth International Conference on Case Histories in Geotechnical Engineering ; 2019 ; Philadelphia, Pennsylvania
Geo-Congress 2019 ; 673-681
2019-03-21
Conference paper
Electronic Resource
English
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