DURABILITY OF GEOTEXTILES
CONTENTS INTRODUCTION THE DIFFERENT ASPECTS OF LONG-TERM BEHAVIOUR OF GEOTEXTILES THE PRODUCERS’ POINT OF VIEW THE USERS’ POINT OF VIEW THE RESEARCHERS’ POINT OF VIEW CIVIL ENGINEERING REQUIREMENTS FOR LONG-TERM BEHAVIOUR OF GEOTEXTILES PREDICTION OF LONG-TERM CREEP AND RELAXATION OF PLASTICS PRINCIPLES OF CREEP AND RELAXATION FLUAGE COMPARÉ DE FILS DE POLYESTER ET DE POLYPROPYLÈNE ASSESSMENT OF THE TIME DEPENDENT OF GEOTEXTILES FOR REINFORCED SOIL LE COMPORTEMENT MÉCANIQUE À LONG TERME DES GÉOTEXTILES ET SA PRISE EN COMPTE DANS LE DIMENSIONNEMENT D’OUVRAGES EXAMINATIONS OF LONG-TERM FILTERING BEHAVIOUR OF GEOTEXTILES ESTIMATION DU COMPORTEMENT HYDRAULIQUE À LONG TERME DES GÉOTEXTILES À PARTIR DES ESSAIS À COURT TERME MÉCANISMES DE COLMATAGE DES GÉOTEXTILES ETUDE DE L’INTERFACE SOL-GÉOTEXTILES EN RELATION AVEC LA RÉTENTION DES PARTICULES PROBLÈMES LIÉS À LA PRÉDICTION DU COMPORTEMENT À LONG TERME DES MATÉRIAUX POLYMÈRES EVOLUTION DES CARACTÉRISTIQUES MÉCANIQUES ET PHYSICOCHIMIQUES DES GÉOTEXTILES PRÉLEVÉS DANS QUELQUES OUVRAGES PROBLEMS RELATING TO LIGHT DEGRADATION AND SITE TESTING OF GEOTEXTILES—INTERIM RESULTS OF AN INTERNATIONAL WEATHERING PROGRAMME THE ROLE OF THERMO-OXIDATIVE AGEING IN THE LONG-TERM BEHAVIOUR OF GEOTEXTILES CONCLUSIONS INTRODUCTION THE INTERNATIONAL SYMPOSIUM ORGANIZED IN PARIS IN 1977 BY THE LABORATOIRE CENTRAL DES PONTS ET CHAUSSÉES AND THE ECOLE NATIONALE DES PONTS ET CHAUSSÉES ON THE USE OF TEXTILES IN GEOTECHNIQUES STIMULATED THE SETTING UP OF THE RILEM TECHNICAL COMMITTEE 47 SYNTHETIC MEMBRANES (TC 47 SM) BETWEEN 1980 AND 1985 TC 47 SM CONCENTRATED ACTIVITY ON GEOTEXTILES AND GEOMEMBRANES, TWO FIELDS IN FULL DEVELOPMENT BY PLACING EMPHASIS ON THE PRIORITY GIVEN TO GEOTEXTILES, THE COMMITTEE PREPARED A SPECIAL ISSUE OF MATERIALS AND STRUCTURES N° 82 1981 DEVOTED TO GEOTEXTILES TC 47 SM WORKED TO A PROGRAMME AIMING AT THE PREPARATION OF RILEM RECOMMENDATIONS RELATED TO TEST METHODS THIS INCLUDED: – DEFINITIONS RELATED TO GEOTEXTILES AND GEOMEMBRANES, – RECOMMENDATIONS MOST EASY TO APPLY FOR TESTING MECHANICAL AND HYDRAULIC CHARACTERISTICS IMPLIED IN THESE DEFINITIONS, – RECOMMENDATIONS TO DEFINE THE BEHAVIOUR OF IMMEDIATE INTEREST FOR THE STUDY OF THE PRACTICAL USE OF GEOTEXTILES AND GEOMEMBRANES IN THE SEARCH FOR SOLUTIONS TO GEOTECHNICAL PROBLEMS THIS WORK RESULTED IN THE PUBLICATION IN MATERIALS AND STRUCTURES BY TC 47 SM (MAY-JUNE 1984 N° 99) OF THE FOLLOWING DRAFT RECOMMENDATIONS FOR WOVEN AND NON-WOVEN GEOTEXTILES : SM G SCOPE G THERMINOLOGY G IDENTIFICATION DATA SHEET G CHARACTERISTICS CF GEOTEXTILES AND CONSTITUENT MATERIALS G SAMPLING G CONDITIONING ATMOSPHERE G WEIGHT PER UNIT AREA G POROMETRY BY WET PROCESS G HYDRAULIC PERMITTIVITY G TRANSMISSIVITY G TENSILE STRENGTH AND ELONGATION TESTS UNDER MAXIMUM STRESS G TEARING STRENGTH