Łupki ilaste z kopalń łęczyckich jako surowiec do produkcji kruszywa lekkiego

Abstract

CLAY SHALES OF THE ŁĘCZYCA MINES AS RAW MATERIAL FOR LIGHT AGGREGATE PRODUCTION Summary According to the programme of searching for mineral raw material basis to produce artificial light aggregate in the Łódź region, a series of studies have been made to explain the possibility if using for this purpose a barren rock (clay shale) dug out in several siderite mines at Łęczyca. The studies have been carried out on both laboratory and industrial scales at the Ceramsite Production Plant at Mszczonów. As a result of the industrial tests, a light aggregate (class”700”) has been obtained, resembling ceramsite characterized by a very high compressive strength. The tests if the aggregate used for compacted and cellular concretes have demonstrated that the material considered may serve to produce concretes from “50” to “250”, their weights being from 1150 kG/m3 to 1550 kG/m3 respectively. The resistance of the compacted varieties of concrete qualifies the material for production of both reinforced and prestressed concrete elements. In connection with the positive results of the research, steps have been taken to construct a new plant for production of light aggregate based on the mineral raw material here considered.