EFECTOS DEL CEMENTO Y DE LA CAL EN MUESTRAS DE MATERIALES QUE CONTIENEN FILITAS PROCEDENTES DE SE DE ESPAÑA

Abstract

It has been previously found that the compacted phyllites did not display an important swelling on soaking at low stresses, as a consequence of its low specific surface and low water-retention ability. This material exhibited good compaction properties and, consequently, low water permeability plus a stiff response on loading. Nevertheless, despite the low porosity attained on the dry-side compaction, the material underwent some collapse on soaking at stresses greater than 100 kPa. Lime and cement addition as stabilisation products have been studied to reduce soil activity, and therefore, its expansivity. The results obtained in the experiences on stabilizations of phyllites-cement and of phyllites-lime improve the capacity amble of the soil. It is demonstrated in this investigation that the most suitable stabilization can be found by addition of 5 wt% cement. Thus, the composite is more impermeable and shows a high resistance to the vertical efforts of compression. For the same reason, the stabilization discards with lime despite the lower relative cost as compared with cement, since a proportion of 3 wt% seems enough to reach the index of capacity amble demanded according to PG-3, managing together to reduce substantially the plasticity of the raw phyllite material.