CARBONATION OF CONCRETE - EFFECTS ON CORROSION PROTECTION OF THE REINFORCEMENT

CARBONATISIERUNG DES BETONS - EINFLUESSE UND AUSWIRKUNGEN AUF DEN KORROSIONSSCHUTZ DER BEWEHRUNG

DIFFERENT MULTIPLE LINEAR REGRESSIONS FOR DETERMINING AND EVALUATING THE VARIOUS LIMITING QUANTITIES REGARDING THE CARBONATION OF CONCRETE HAVE BEEN CARRIED OUT WITH THE AID OF AN ELECTRONIC SEQUENTIAL COMPUTER USING A LARGE NUMBER OF CARBONATION TEST RESULTS. CARBONATION CAN BE REGARDED, WITH A SUFFICIENTLY ACCURATE APPROXIMATION, AS BEING DEPENDENT ONLY ON THE FOUR MAIN EFFECTS- ENVIRONMENTAL CONDITIONS, COMPOSITION OF THE CONCRETE, AFTER-TREATMENT, AND TIME. THE EFFECT OF THE COMPOSITION OF THE CONCRETE CAN BE DESCRIBED BY DIFFERENT QUANTITIES WHICH CORRELATE MORE OR LESS WELL SO THAT THERE IS A CERTAIN FREEDOM OF CHOICE IN SELECTING FROM THEM THE CHARACTERISTIC QUANTITY. ACCORDING TO THE INVESTIGATIONS DESCRIBED, THE EFFECT OF THE COMPOSITION OF THE CONCRETE CAN WELL BE ASSESSED FROM THE STRENGTH WHICH THE CONCRETE HAS ATTAINED AFTER A CERTAIN TIME, SAY 7 TO 28 DAYS. THE 28 DAY STRENGTH CAN ALSO BE EMPLOYED AS AN APPROXIMATION FOR THIS.