SEDL / STP / STP1079-EB / STP23508S

Towards Understanding the Behavior of Grave Emulsions by Means of Laboratory Study

Brennan, MJ
Statutory lecturer, University College, Galway,

Huet, M
Adjoint Scientifique, Ecole Polytechnique Fédérate de Lausanne, Lausanne,

Lafon, JF
Chef de Section Route, Laboratoire Régional de Toulouse, Toulouse,

Paute, JL
Deputy Director, Laboratoire Régional de Saint-Brieuc, St. Brieuc,

Pages: 16    Published: Jan 1990

Download this paper for $25 PDF (412K)          View License Agreement
Abstract

The evolution of new grave emulsions rich in binder (about 4%) has permitted the coring of materials in situ for laboratory studies. The modulus of poorly conditioned grave emulsion was found to depend on the sum of the restraining forces in a repeated triaxial compression test. However, there was a trend for the modulus of the well-conditioned material to be stress independent. Moduli estimated from direct tension tests using cores of grave emulsion after more than five years service were of the order of one third of the value for a typical dense bitumen macadam. Gyratory compaction studies showed that grave emulsion requires double the compactive effort to achieve the same density as a dense bitumen macadam. Moreover, a compaction plant is less efficient on site with grave emulsion due to the limited ability of pneumatic-tired rollers to expel water from the material.