Prediction of the volume of concrete backfill materials excavated using a pick
MORIN ; SEDRAN ; DE LARRARD ; DUMONTET ; MURGIER ; HARDY ; DANO
Type de document
ARTICLE A COMITE DE LECTURE REPERTORIE DANS BDI (ACL)
Langue
anglais
Auteur
MORIN ; SEDRAN ; DE LARRARD ; DUMONTET ; MURGIER ; HARDY ; DANO
Résumé / Abstract
Pick excavatability of controlled low-strength materials was experimentally studied 10 to circumvent the fact that current classification systems or empirical excavatability criteria lack relevance (they do not refer to digging facilities and depend on the mix design and the granular skeleton of the material). Manual excavation is separated into two steps: the impact of the pick and decompaction. This was analysed by a mechanical approach. Energy is mainly consumed during the first step. A laboratory punching test was therefore proposed to evaluate excavatability (a confined cylindrical specimen was loaded by a cylindrical punch). Results were compared between
the mechanised and the manual pick excavation tests on field trenches backfilled with air-entrained mortars or very lean concretes. These comparisons confirmed that a limited compressive strength was an indicator of excavatability. A model was proposed to evaluate the excavated volume by punching penetration for a given level of energy and a maximum size of aggregates in the material
Source
European journal of environmental and civil engineering/Revue européenne de génie civil, num. 10, pp.935-955 p.
Editeur
TAYLOR AND FRANCIS
