INFLUENCE OF THE SMALLEST GRAINS OF SAND ON THE RESISTANCE OF CONCRETE TO FROST AND DEICING SALT

EINFLUSS DER FEINSTTEILE DES SANDES AUF DIE FROST-TAUSALZBESTAENDIGKEIT VON BETON

CONCRETES MADE OF 12 - 15 DIFFERENT SANDS ARE TO BE EXAMINED TO DETERMINE THE PRACTICAL MO PARTICLE CONTENT NECESSARY TO AVOID DAMAGE. THE SANDS WILL BE SUBJECTED TO MINERALOGICAL STUDIES. THE MO PARTICLE CONTENT OF SOME OF THE CONCRETES IS TO CORRESPOND TO THE CURRENT LIMIT VALUES AND IN OTHERS IT IS TO BE ENRICHED. AIR-ENTRAINING ADMIXTURES ARE TO BE ADDED TO THE CONCRETES SO THAT THE LOWEST AIR CONTENT PERMITTED IS ATTAINED. TO TEST RESISTANCE TO FROST AND DEICING SALT THE SLABS ARE BEING COVERED WITH A 3 MM THICK 3 PERCENT NACL SOLUTION AND SUBJECTED TO 100 FREEZING-THAWING CYCLES AT MINUS 20 DEGRESS C AND PLUS 20 DEGRESS C.