STUDIES OF THE DELIVERY OF READY-MIXED CONCRETE HAVING ARTIFICIAL AIR VOIDS AND THE COURSE OF HARDENING OF ROAD CONCRETE

LIEFERUNG VON TRANSPORTBETON MIT KUENSTLICHEN LUFTPOREN UND ERHAERTUNGSVERLAUF VON STRASSENBETON

SPECIAL IMPORTANCE IS ATTACHED TO THE DELIVERY OF READY- MIXED CONCRETE FOR THE TYPE OF MAINTENANCE AND REPAIR WORK WHERE THE USE OF ONE'S OWN MIXING PLANT WOULD INVOLVE HIGH COSTS. SINCE HOWEVER ARTIFICIAL AIR VOIDS ARE NECESSARY TO MAKE ROAD CONCRETE RESISTANT TO DE-ICING SALT, THE PROPERTIES OF READY-MIXED CONCRETE HAVING ARTIFICAL AIR VOIDS ARE TO BE EXAMINED DURING THE COURSE OF THIS RESEARCH. IN COOPERATION WITH A READY-MIXED CONCRETE FACTORY, AN EXAMINATION IS TO BE MADE OF THE INFLUENCES OF CONCRETE HANDLING FROM THE PRODUCTION OF THE CONCRETE MIXTURE, VIA THE TRANSPORT IN THE TRAVEL MIXER, TO PLACEMENT AT THE CONSTRUCTION SITE, WITH REFERENCE TO THE PROPERTIES OF THE FRESH AND THE HARDENED CONCRETE. MOREOVER THE COURSE OF HARDENING OF ROAD CONCRETE IS TO BE OBSERVED, AS AN EXACT KNOWLEDGE OF THIS COULD UNDER CERTAIN CIRCUMSTANCES MAKE POSSIBLE THE EARLY OPENING OF CONCRETE ROADS TO TRAFFIC, THUS BRINGING ECONOMIC ADVANTAGES.