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| 1 | Behavior of diatomaceous soil in lacustrine deposits of Bogota, Colombia显示文摘This work presents a study on the behaviors of diatomaceous soils. Although studies are rarely reported on these soils, they have been identified in Mexico City, the Sea of Japan, the northeast coast of Australia,the equatorial Pacific, and the lacustrine deposit of Bogota(Colombia), among other locations. Features of this kind of soil include high friction angle, high initial void ratio, high compressibility index, high liquid limit, and low density. Some of these features are counterintuitive from a classical soil mechanics viewpoint. To understand the geotechnical properties of the diatomaceous soil, a comprehensive experimental plan consisting of more than 2400 tests was performed, including physical tests such as grain size distribution, Atterberg limits, density of solid particles, and organic matter content; and mechanical tests such as oedometric compression tests, unconfined compression tests, and triaxial tests.Laboratory tests were complemented with scanning electron microscope(SEM) observations to evaluate the microstructure of the soil. The test results show that there is an increase in liquid limit with increasing diatomaceous content, and the friction angle also increases with increasing diatomaceous content. In addition, several practical correlations were proposed for this soil type for shear strength mobilization and intrinsic compression line. Finally, useful correlations were presented, such as the relationship between the state consistency and the undrained shear strength, the friction angle and the liquid limit, the void ratio at 100 kPa and the liquid limit, the plasticity index and the diatomaceous content, among others. | Bernardo Caicedo Cristhian Mendoza Fernando López Arcesio Lizcano | 2018 | Journal of Rock Mechanics and Geotechnical Engineering2018，10，2： | 5 |
| 2 | Peri-implant Diseases显示文摘 | Georgios E. Romanos Fawad Javed Rafael Arcesio Delgado-Ruiz José Luis Calvo-Guirado | 2015 | Dental Clinics of North America2015，，： | 1 |
| 3 | Porous titanium granules in critical size defects of rabbit tibia with or without membranes显示文摘Recently,porous titanium granules(PTGs)have been indicated for the preservation of the dimensions of post-extraction sockets,as a filler in sinus lift procedures and for the treatment of peri-implant and periodontal defects,based on the osteoconductivity and dimensional stability of the titanium granules.However,there is a lack of information regarding the use of this material in larger defects and in conjunction with membranes.The objective of this study is to test the behavior of PTGs used to fill critical size defects in rabbit tibiae,with and without membranes.Critical defects were created in both tibiae of rabbits,divided randomly into three groups:Group A(defect filled with PTG),Group B(defect filled with PTG1collagen membrane)and a control group(empty defect).After six weeks,histomorphometric analysis was performed.The results showed more defect closures at the cortical area(87.37%62.2%)and more bone formation at the marrow area(57.6%61.3%)in Group B,in comparison with the other groups(P,0.05);the use of membranes improved the material stability expressed as more percentages of the original material when membranes were used(P,0.05).Finally,inflammatory reactions were observed when the granules were not protected by membranes.In spite of the limitations of this animal study,it may be concluded that PTG particles are osteoconductive and allow bone growth.The PTG particles must be covered by a membrane,especially when grafting larger defects,in order to control particle migration,promote clot stabilization and separate the PTG graft from undesired soft tissue cells. | Rafael Arcesio Delgado-Ruiz Jose Luis Calvo-Guirado Marcus Abboud Maria Piedad Ramirez-Ferna'ndez Jose Eduardo Maté-Snchez Bruno Negri Alex Won Georgios Romanos | 2014 | International Journal of Oral Science2014，6，2： | 1 |
| 4 | Some contributions to mechanical behaviors of lacustrine deposit in Bogota, Colombia显示文摘This paper presents the mechanical behaviors of the lacustrine deposit,a representative soil in Bogota,Colombia.Initially,the physical characterization of the deposit is performed via laboratory tests (grain size distribution,scanning electron microscopy,Atterberg limits and water content).This characterization intends to explain the special characteristics of the mechanical behaviors of this soil.Then,various triaxial tests are carried out with controlled loading path,strain rate change,relaxation,extensile stress,and cyclic loading.The test results reveal the shape of the yield curve for Bogotá soil (in a natural state),and also show that an increasing effect of the strain rate depends on the liquid limit.This effect is also preserved with extensile stresses (which are poorly studied in soil mechanics).Finally,other effects,such as the loss of structure in the reconstituted samples and the effect of shear modulus at low strains,are studied for Bogota soil. | Bernardo Caicedo Cristhian Mendoza Arcesio Lizcano Fernando Lopez-Caballero | 2019 | Journal of Rock Mechanics and Geotechnical Engineering2019，11，4： | 0 |
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