README.txt Public

The goal of the project was to explore the use of x-ray micro computed tomography (µCT) to investigate the effects of deicing salts on soils and soil-compost mixtures that are typically used as stormwater filter media (SFM). Identical samples were moistened and compacted into small polycarbonate tubes. The samples were prepared carefully controlling the particle size distribution and the dry density achieved by compaction. The samples were dried until they reached a steady minimum mass. To obtain the pre-flow internal structure of samples, they were scanned with a Bruker’s SkyScan 1173 µCT system. Flow tests were conducted on samples at three different gradients, with or without NaCl in influent water, and with or without compost in the samples. Most of the tests were conducted on triplicate samples. During the flow tests, the flow rate was measured at reasonable intervals. After running the flow tests, until an asymptotic flow rate was reached, the samples were again dried and scanned with the same µCT system, to get the post-flow internal structure of samples. Overall, 24 samples were scanned pre-flow and post-flow, with an aim to study the effects of experimental variables (NaCl, compost, hydraulic gradient), by analyzing the sets of µCT images. The image-sets have so far been analyzed with (1) Bruker’s CT-Analyser Version 1.13 software, and (2) Avizo Fire 8 software. We are currently working on using the Avizo results (3D individual objects) in coupled DEM-CFD (discrete element method and computational fluid dynamics) simulations.

README

���

TITLE: Deterioration of Stormwater Filter Media by Deicing Salts: X-ray Micro Computed Tomography (��CT)

CREATORS: Dr. Sai P. Kakuturu, Principal Investigator
Associate Professor of Civil Engineering
School of Science, Engineering, and Technology

The Pennsylvania State University ��� Harrisburg
Middletown, PA 17057, USA; Email: spk14@psu.edu

PROJECT DATES: August 15, 2015 to July 31, 2017
NSF-EAGER Award Number: 1548901

PROJECT DESCRIPTION:

     The goal of the project was to explore the use of x-ray micro computed tomography (��CT) to investigate the effects of deicing salts on soils and soil-compost mixtures that are typically used as stormwater filter media (SFM). Identical samples were moistened and compacted into small polycarbonate tubes. The samples were prepared carefully controlling the particle size distribution and the dry density achieved by compaction. The samples were dried until they reached a steady minimum mass. To obtain the pre-flow internal structure of samples, they were scanned with a Bruker���s SkyScan 1173 ��CT system. Flow tests were conducted on samples at three different gradients, with or without NaCl in influent water, and with or without compost in the samples. Most of the tests were conducted on triplicate samples. During the flow tests, the flow rate was measured at reasonable intervals. After running the flow tests, until an asymptotic flow rate was reached, the samples were again dried and scanned with the same ��CT system, to get the post-flow internal structure of samples. Overall, 24 samples were scanned pre-flow and post-flow, with an aim to study the effects of experimental variables (NaCl, compost, hydraulic gradient), by analyzing the sets of ��CT images. The image-sets have so far been analyzed with (1) Bruker���s CT-Analyser Version 1.13 software, and (2) Avizo Fire 8 software. We are currently working on using the Avizo results (3D individual objects) in coupled DEM-CFD (discrete element method and computational fluid dynamics) simulations.

DATA DESCRIPTION:

The data is currently organized into four works:
(1) Pre-flow and post-flow images of the 24 samples (48 sets).
(2) Pre-flow and post-flow CT-Analyser results (48 Excel files of pore size distribution of whole samples, slice-wise porosity in samples, and other morphological parameters)
(3) Pre-flow and post-flow Avizo Fire results (48 Excel files of 3D individual objects)
(4) Sample and Flow Data (materials��� properties, test variables, flow rates, etc.)

Later, a fifth work will be posted with the results of coupled DEM-CFD simulations.

USAGE:

The image files can be opened by any image viewing/processing software.
The Excel and Word files can be opened by MS-Office or compatible software.

FILE MANIFEST or DATA STRUCTURE

critter1.bam: Sequence data file from sample critter1.

critter2.bam: Sequence data file from sample critter2.

CITATION:

Sai Kakuturu Deterioration of Stormwater Filter Media by Deicing Salts: X-ray Micro Computed Tomography (��CT), 2017. DOI: https://doi.org/10.18113/S1XP62

LICENSING:

Creative Commons Attribution 4.0 International Non-Commercial-Share-Alike 3.0: CC BY-NC-SA.

Items in this Work

User Activity Date
User Robert K Olendorf has attached README.txt to README.txt 10 months ago
User Robert K Olendorf has deposited README.txt 10 months ago