STRESS-STRAIN BEHAVIOUR OF LIGHTWEIGHT CONCRETE MADE OF EXPANDED CLAY AGGREGATES

SPANNUNGS-DEHNUNGSVERHALTEN VON LEICHTBETON AUS BLAEHTONZUSCHLAEGEN

A LIGHTWEIGHT CONCRETE MADE FROM EXPANDED CLAY AGGREGATE WITH A CONCRETE GROSS DENSITY OF 1.3 KG/DM2 WAS TESTED. THE TENSILE STRENGTH OBTAINED IN THE SHORT PERIOD TEST WAS ON AVERAGE 16.1 KP/CM2, THE ASSOCIATED ELONGATION 0.173/1000. THE PRISM COMPRESSION STRENGTH WAS 205 KP/CM2, WITH A COMPRESSION OF 2.2/1000. ORIGINALLY THE TWO STRESS-STRAIN LINES HAD A COMMON TANGENT. THE STRESS-STRAIN LINE IN THE TENSION AREA WAS AFFECTED VERY LITTLE BY THE LOWER DEFORMATION RATE. IN THE COMPRESSION AREA, ON THE OTHER HAND, LARGER DEFORMATIONS WERE OBSERVED IN THE SLOW TEST. THE BENDING TENSILE STRENGTH WAS 19.0 KP/CM2 WITH AN ELONGATION OF 0.23/1000. DUE TO THE INCREASED LOADING BOTH THE STRENGTH AND THE SHAPE OF THE STRESS-STRAIN LINES WERE CHANGED. THE TESTS ARE CLOSELY RELATED TO PARALLEL TESTS ON THERMAL STRESSING OF COMPONENTS CARRIED OUT BY THE HOLZKIRCHEN INSTITUTE FOR TECHNICAL PHYSICS. THE TESTING OF OTHER BUILDING MATERIALS WHICH MAINLY FIND APPLICATION AS EXTERNAL COMPONENTS OF STRUCTURES IS PLANNED.