This paper focuses attention on some basic aspects of the role and influence of the clay fraction in marly soils (palygorskite and sepiolite) on marl behaviour. The clay fraction of marl is most often dominated by palygorskite and/or sepiolite. It is the performance of these clay soil fractions that are the root cause of many of the problems encountered in the use of such soils as load bearing materials. In this paper some geotechnical and geoenvironmental aspects of marl behaviour are investigated, and a new definition and classification of marly soils is presented. It is concluded that the presence of palygorskite or sepiolite in marly soils will control the geoenvironmental and geotechnical behaviour of such soils.

  • INTRODUCTION

  • MATERIALS AND METHODS

  • ROLE OF MARL COMPONENTS UPON ITS BEHAVIOUR

  • TOTAL RELEASIBLE ALUMINA AND SILICA OF CLAY MINERALS

  • NEW DEFINITION AND CLASSIFICATION OF MARLY SOILS

  • CONCLUDING REMARKS

  • REFERENCE

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