BEHAVIOUR OF CONCRETE IN LIME-SOLUBLE CARBONIC ACID

VERHALTEN VON BETON IN KALKLOESENDER KOHLENSAEURE

LONG-PERIOD TESTS ARE CARRIED OUT TO DETERMINE WHETHER THE RESISTANCE OF DENSE CONCRETE TO ATTACK BY ACIDS, PARTICULARLY OF LIME SOLUBLE CARBONIC ACID CAN BE INCREASED BY USING CEMENTS CONTAINING A LITTLE LIME, OR USING LIMESTONE AS AGGREGATE. FOR THIS PURPOSE, FINE CONCRETE PRISMS 4 X 4 X16 CM OF SEVERAL PORTLAND CEMENTS OF DIFFERENT COMPOSITION-AS WELL AS OF METALLURGICAL SAND AND TRASS-CONTAINING CEMENTS WERE PREPARED. RHINE SAND AND LIMESTONE CHIPPINGS WERE USED AS AGGREGATE. THE FINE CONCRETES CONTAINED 350 KG OF CEMENT PER SQUARE METRE, THE WATER/CEMENT VALUE WAS 0.50. AFTER 28 DAYS CONDITIONING, THE PRISMS WERE EXPOSED TO ATTACK BY WATER CONSTANTLY SATURATED WITH CARBON DIOXIDE.