Salva and Santamarina - 2021_removed.pdf
KAUST DepartmentEnergy Resources & Petroleum Engineering
Ali I. Al-Naimi Petroleum Engineering Research Center (ANPERC)
Physical Science and Engineering (PSE) Division
Energy Resources and Petroleum Engineering Program
Online Publication Date2021-09-21
Print Publication Date2022-01-01
Permanent link to this recordhttp://hdl.handle.net/10754/679051
MetadataShow full item record
AbstractSpecific surface area is more informative than grain size for fine-grained sediments where Ss > 1 m2/g. In fact, specific surface area plays a central role in engineering properties and processes in fine-grained soils, including pore size and bioactivity; fabric, plasticity, and rheology; hydraulic and electrical conductivity; compressibility and residual friction angle; and all forms of coupled processes. This research advanced a dye adsorption method using digital image colorimetry implemented with smartphone technology. In particular, this research adopted a water-based approach to reach internal surfaces in platy phyllosilicates, selected short dye molecules to reduce the range of potential molecular contact area, and developed a physics-based adsorption model to analyze the complete data set to minimize the uncertainty in specific surface area determinations. The study involved fine-grained soils with distinct mineralogy and specific surface area (from 1 to 600 m2/g) and various cationic dyes and a protein to explore the effect of molecular size, shape, and pH. Crystal violet emerged as a reliable dye for soil characterization. Time-dependent measurements confirmed second-order kinetics and highlight the importance of adsorption time.
CitationSalva Ramirez, M., & Carlos Santamarina, J. (2021). Specific Surface Area by Colorimetry and Image Analysis. Geotechnical Testing Journal, 45(1), 20210026. https://doi.org/10.1520/gtj20210026
SponsorsSupport for this research was provided by the KAUST Endowment at King Abdullah University of Science and Technology.
JournalGeotechnical Testing Journal