IGS TC-H: Recent Advances in Geotextile Filtration Design: Pore Opening Size Measurement


Summary

The video provides a comprehensive overview of measuring opening sizes of geotextiles, emphasizing the importance of specific testing procedures within the geosynthetics community. Various measurement techniques such as ASTM standards and optical measurement methods are discussed, along with challenges like static electricity and ensuring consistent product quality. The importance of technical committees in the International Geosynthetics Society (IGS) for advancing industry standards is also highlighted.


Introduction and Program Overview

The video begins with the introduction by Eric Blong, the chairman of the technical committee on hydraulics, who outlines the 90-minute program focusing on the measurement of opening sizes of geotextiles. Sam Allen and Melissa Medlin join the discussion to highlight the importance of these instruments and specific testing procedures within the geosynthetics community.

Measurement Challenges and Techniques

Various measurement techniques such as ASTM D4751, ASTM D6767, ISO 12956, and Canadian standards are discussed for measuring opening sizes of geotextiles. The challenges of static electricity, use of glass beads, and different testing methods are elaborated on.

Introduction to Permeability Testing

The chapter covers the concept of permeability testing with parameters like resistance, hydraulic flow regime, and characteristic flow equation. The discussion includes the use of a Perometer for determining filter performance and pore size distribution.

Optical Measurement Techniques

The optical measurement techniques for evaluating pore sizes in geotextiles are explained. The use of image analysis, microscopy, and light sources in testing knitted geotextiles are highlighted.

Soil Particle Distribution Study

Discusses the uniform distribution of soil particles in fabric and the correlation between various factors like FOS and opening size.

Optical Measurements Application

Describes the use of optical measurements for geotextiles, including the process, analysis, and correlation with standard methods.

Engineering Properties and Procedures

Explains the need for different procedures for geogrids and geotextiles to ensure consistency and reliability in testing.

Filtration Design and Challenges

Addresses the challenges and effectiveness of filtration design methods, emphasizing the importance of consistent product quality and test procedures.

Role of Technical Committees in IGS

Highlights the role of technical committees in the International Geosynthetics Society (IGS) and encourages participation in contributing to the industry.

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