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Applying organo-silanes (OS) as water-repellent additives can enhance soil properties, crucial for use as moisture barriers in infrastructures like roads, landfills, and tunnels. This study used four soil samples and glass beads, treated with three OS products at dosages from 1:1 to 1:1000. Laboratory tests included contact angle, water drop penetration, and breakthrough pressure on 216 samples. Results showed increased hydrophobicity with higher OS dosages, with contact angles over 110° and Water Drop Penetration Test times above 3600s. However, effectiveness plateaued at certain dosages, indicated by electrical conductivity and pH changes. The primary factors (94.6% influence) were soil type, OS product, dosage, and drying condition, while reaction time, and leaching/washing had a minor impact (5.4%). Treated soils could sustain a hydrostatic head of up to 17 kPa. These insights aid in optimizing water-repellency treatments for soil performance and infrastructure durability in geotechnical applications. 

Selected papers from sessions of Geo-Congress 2022, held in Charlotte, North Carolina, March 20–23, 2022. Sponsored by the Society of Exploration Geophysicists and the Geo-Institute of ASCE. This Geotechnical Special Publication contains 66 peer-reviewed papers on geosynthetics, innovative geomaterials, and soil improvement techniques. Topics include: rigid inclusions and stone columns; soil stabilization; bio-grouting and bio-inspired solutions; geosynthetics; and innovative geomaterials and methods. GSP 331 will be valuable to practitioners and researchers working in the area of soil improvement. 

Selected papers from sessions of Geo-Congress 2022, held in Charlotte, North Carolina, March 20–23, 2022. Sponsored by the Society of Exploration Geophysicists and the Geo-Institute of ASCE. This Geotechnical Special Publication contains 66 peer-reviewed papers on geosynthetics, innovative geomaterials, and soil improvement techniques. Topics include: rigid inclusions and stone columns; soil stabilization; bio-grouting and bio-inspired solutions; geosynthetics; and innovative geomaterials and methods. GSP 331 will be valuable to practitioners and researchers working in the area of soil improvement. 

Selected papers from sessions of Geo-Congress 2022, held in Charlotte, North Carolina, March 20–23, 2022. Sponsored by the Society of Exploration Geophysicists and the Geo-Institute of ASCE. This Geotechnical Special Publication contains 56 peer-reviewed papers on monitoring and sensing and embankments, dams, and slopes. Topics include: monitoring and remote sensing for geo-systems; geotechnics of resilient infrastructure; pavements; geotechnical engineering education; and data and software in geotechnical engineering. GSP 336 will be valuable to practitioners and researchers working in the areas of pavements and remote sensing and monitoring of geo-systems. 

Proceedings of sessions of Geo-Extreme 2021, held in Savannah, Georgia, November 7–10, 2021. Sponsored by the Geo-Institute of ASCE. GSP 330 contains 37 peer-reviewed papers on infrastructure resilience, big data, and risk. Topics include: geo-materials under extreme loading; cold regions and the Arctic; decision making and planning for extreme events; big data and modeling; and risk management. This GSP will be of interest to geotechnical engineers, climate scientists, emergency managers, insurance professionals, and policy makers working to address a wide variety of extreme events.