STUDIES OF THE VALUE OF STEEL INDUSTRY SLAGS OF THE LD TYPE AS AGGREGATES FOR ROADS, ESPECIALLY IN SURFACINGS

UNTERSUCHUNGEN ZUR VERWERTBARKEIT VON STAHLWERKSSCHLACKEN VOM LD-TYP ALS MINERALSTOFFE FUER DEN STRASSENBAU, INSBESONDERE IN DECKSCHICHTEN

THE INCREASING QUANTITIES OF LD SLAGS MEAN THAT THESE SHOULD BE EVALUATED. THE BASIC PROPERTIES OF PART OF THE SLAGS SHOW THAT THEY MAY BE SUITABLE FOR USE IN ROADS AS AGGREGATES. IN PARTICULAR THE RESISTANCE TO POLISHING, THE SKIDDING RESISTANCE AND THE STRENGTH OF THESE SLAGS HAS BEEN SHOWN TO BE SO GOOD THAT IT IS POSSIBLE TO USE THEM IN SURFACINGS. DIFFICULTIES MAY ARISE BECAUSE OF LACK OF DURABILITY DUE TO A LIME CONTENT WHICH IS TOO HIGH. THE OBJECT OF THE WORK IS TO STUDY THE SUITABILITY OF LD SLAGS HAVING A VARYING FREE LIME CONTENT AND A VARYING DEGREE OF DURABILITY FOR USE IN SURFACINGS. THE EXTENT TO WHICH THESE SLAGS ARE SUITABLE FOR COARSE AGGREGATE BASES IN ACCORDANCE WITH THE TECHNICAL SPECIFICATIONS FOR ROADBASES (TVT 72) IS ALSO TO BE ESTABLISHED. BY MEANS OF TRAFFIC SIMULATION ON THE CIRCULAR TEST TRACK AND FURTHER PHYSICAL INFLUENCES (NATURAL WEATHERING, ARTIFICIAL SPRAYING WITH WATER), THE BEHAVIOUR OF DIFFERENT LD SLAGS ON THE ROAD IS TO BE DETERMINED WITH RESPECT TO THEIR DURABILITY, SKIDDING RESISTANCE AND POLISHING RESISTANCE. THE WORK IS PERMITTED IN ASSOCIATION WITH THE DEFINED CHARACTERISTIC VALUES FOR ROAD CONSTRUCTION . USE OF THESE SLAGS IN ROADS WILL BE REGARDED AS A CONTRIBUTION TO MORE ECONOMIC CONSTRUCTION.