Reducing water effects on the behaviour of coarse granular aggregates
| Autor: | Ramon Tarragona, Anna|||0000-0003-2140-7945, Montserrat, Marina, Alonso Pérez de Agreda, Eduardo|||0000-0003-2472-3951, Romero Morales, Enrique Edgar|||0000-0002-4105-8941 |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya. MSR - Mecànica del Sòls i de les Roques |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| Popis: | Rockfill embankments, rockfill dams and ballast beds experience long term compression deformations under constant loading as well as collapse deformations when relative humidity (RH) increases. Particle breakage is at the origin of post construction deformations of infrastructures made of gravels and rockfill. Prevailing RH, inter-particle contact loads and material toughness control particle breakage. The aim of the investigation described in the paper was to explore a treatment for granular media that allows the reduction of post construction deformations of transportation infrastructures. The objective was to decrease or eliminate the influence of relative humidity in particle breakage. The fundamentals of the hydrophobicity (repellence to water) of surfaces have been investigated with the aim of developing a stable hydrophobic coating treatment at laboratory scale. The effectiveness of the treatment has been studied experimentally by means of large diameter oedometric and uniaxial compression tests. Samples of gravel treated with hydrophobic coatings and non-treated gravel were tested under different conditions of relative humidity. The Sessile Drop Method allowed the verification of the hydrophobicity of the tested rockfill particles after the application of the water-repellent treatment. Uniaxial compression tests on individual particles showed that the water-repellent treated particles achieve the same uniaxial compression strength when tested under wet or dry conditions. The samples prepared with hydrophobic-treated particles underwent lower compressibility than the samples built with non-treated particles in large diameter oedometric tests. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|