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Porosity cement index to evaluate geomechanical properties of an artificial cemented soil by fonseca 2013

Porosity cement index to evaluate geomechanical properties of an artificial cemented soil Le paramètre porosité ciment pour l ? évaluation des propriétés géomécaniques d'un sol cimenté artificiellement Rios S Viana da Fonseca A Faculty of Engineering of the University of Porto ABSTRACT This paper highlights the importance of the porosity cement index on the evaluation of the geomechanical properties of soil-cement mixtures as a contribution to analyse these materials This index is defined as the ratio between porosity and volumetric cement content combining the degree of compaction with the cement content The relevance of these two parameters is defined by an exponent to the volumetric cement content which changes with the type of soil This paper results from a broad experimental program with unconfined compression tests indirect tensile tests triaxial tests and oedometer tests which were all analysed by this index adjusted by a specific exponent value The tensile and compression strength the elastic and initial tangent stiffness as well as the compressional behaviour are conveniently represented by this index and a different behaviour is observed when this index is changed RÉSUMÉ L ? importance du paramètre porosité ciment dans l ? évaluation des propriétés géoméchaniques des mélanges sol-ciment est présentée dans cet article comme une contribution pour l ? analyse de ces matériaux Ce paramètre est défini comme le rapport entre la porosité et la teneur volumique en ciment L ? importance relative entre la porosité et la teneur en ciment est introduite en introduisant un exposant à la teneur volumique en ciment dépendant du type de sol Les résultats d ? un vaste programme expérimental incluant essais de compression simples essais de traction indirect essais triaxiaux et essais ?dométriques sont présentés et analysés par ce paramètre ajusté par un exposant spécifique La résistance à la compression et à la traction la rigidité élastique et tangente initiale ainsi que le comportement en compression sont bien représentés par l ? intermédiaire de ce paramètre et un comportement différent est observé si le paramètre est modifié KEYWORDS soil-cement porosity cement index tensile strength compression strength compressional behaviour INTRODUCTION Soil-cement mixtures are very interesting for the construction of road and railway platforms especially in the noble layers of subgrade as well as in transition zones between embankment and concrete structures where good mechanical properties are required This solution not only concurs to improve those characteristics but also leads to a significant reduction in the economic and environmental costs of these works Despite these advantages this method has not a generalized application in Portugal due to the lack of design methodologies based on mechanical parameters There are several factors affecting the behaviour of cemented soils such as the type of cement and cement content the curing time and stress the water content and porosity Seeking for a ratio that would reflect the influence of some of these parameters Consoli et al presented an index property defined as the ratio of porosity to the volumetric cement content called porosity cement ratio n Civ Some