Ms. Sylvia Rodriguez-Abudo Profile

Sylvia Rodriguez-Abudo

Undergraduate Student at Univ de Puerto Rico Mayagüez

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Proceedings Article | 7 May 2007 Paper

Development of a multi-scale packing methodology for evaluating fate and transport processes of explosive-related chemicals in clayey soils

Sylvia Rodríguez, Ingrid Padilla, Sangchul Hwang

Proceedings Volume 6553, 65531M (2007) https://doi.org/10.1117/12.719882

KEYWORDS: Soil science, Particles, Land mines, Head, Visualization, Humidity, Environmental sensing, Explosives detection, Systems modeling, Data modeling

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Detection of explosive-related chemicals (ERCs) derived from landmines sources is influenced by fate and transport processes. Characterization and quantification of the effects of environmental factors on the fate and transport behavior ERCs near soil surface environments requires the development of physical models that can mimic the conditions found in the field. The development of the scalable systems and methods involves proper reproduction of soil composition, lithology and structures, appropriate placement of boundary conditions, and suitable simulation of representative environmental conditions. This paper evaluates the ability of different packing methods for clayey soils to attain physical and transport properties representative of field conditions, and which can yield reproducible results across different scales and dimensions. Characteristics and reproducibility of packing properties is evaluated in terms of soil bulk density, porosity, flow capacity and particle size distribution. The packing methods were tested under different water content conditions and they are described as infiltration packing, saturation packing, plastic limit packing, inverse infiltration packing, induced settling packing, and vibration packing. The systems were evaluated for consistent bulk density, porosity, flow capacity and particle size distribution with depth. Preliminary results exhibit satisfactory bulk density and porosity values for the vibration packing method under field water content conditions, ranging from 1.15 to 1.31 g cm-3 and from 42 to 44%, respectively. This method also shows acceptable flow capacity and the particle size distribution that is found in the field.

Proceedings Article | 18 May 2006 Paper

Development of a multiscale packing methodology for evaluating fate and transport processes of explosive-related chemicals in soil physical models

Sylvia Rodríguez, Ingrid Padilla, Ivonne Santiago

Proceedings Volume 6217, 62171U (2006) https://doi.org/10.1117/12.665879

KEYWORDS: Soil science, Particles, Land mines, Explosives, Data modeling, Instrument modeling, Environmental sensing, Carbon monoxide, Civil engineering, 3D modeling

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The development of the scalable systems and methods involves proper reproduction of soil composition, lithology and structures, appropriate placement of boundary conditions, suitable simulation of representative environmental conditions, and the use of representative sampling systems. This paper evaluates the effect of different packing methods with a tropical sandy soil for obtaining a uniform and homogeneous packing so that these characteristics are comparable across all scales and dimensions. The packing methods used include piston-driven dry packing, piston-driven wet packing, and gravity-driven sedimentation packing. For dry and wet packing, the procedure consisted on the iterative addition of soil layers, mixing and compaction. Sedimentation packing involved the preparation of soil slurry and allowing its deposition under gravity. The systems were evaluated for consistent bulk density, porosity, homogeneity, and soil dispersivity. Preliminary results exhibit satisfactory bulk density and porosity values for the piston-driven methods, ranging from 1.59 to 1.64 g cm^-3 and from 42 to 44%, respectively. Sedimentation packing results in fair homogeneity and gradation, while dry packing develops heterogeneous layering. Transport parameters were also evaluated resulting in consistent dispersivity values for wet piston-driven packing ranging from 0.09-0.19 cm. Wet piston-driven packing is recommended as they yielded the most reproducible results for tropical sandy soils. The reproducibility of the recommended method is tested and proven in other physical models of different scales and dimensions. The method herein developed are, therefore, applicable for the development of representative multidimensional physical models designed to simulate soil and environmental fate and transport processes occurring in field conditions where landmines and other explosive devices are present.

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