EFFECT OF CRACK WIDTH ON THE CORROSION OF STEEL IN LIGHTWEIGHT CONCRETE. STUDIES AND PROVISION OF A REPORT AFTER 5 YEARS IN OPERATION

EINFLUSS DER RISSBREITE AUF DIE KORROSION VON STAHL IN LEICHTBETON. UNTERSUCHUNGEN UND BERICHTERSTATTUNG NACH 5JAEHRIGER LAGERUNGSZEIT.

TO CLARIFY THE QUESTION OF THE PERMISSIBLE CRACK WIDTH AND REQUIRED CONCRETE COVER OF REINFORCED LIGHTWEIGHT CONCRETE ELEMENTS, A RELATION IS TO BE FOUND BETWEEN CRACK WIDTH AND DECREASE IN CORROSION ON THE REINFORCEMENT FOR VARIOUS CONCRETE COVERS AND PERIODS OF TIME IN USE. OF A TOTAL OF 64 TEST BEAMS LEFT AFTER THE FIRST SAMPLING, 24 ARE BEING TAKEN AFTER A FIVE YEAR PERIOD OF USE; MEASUREMENTS ARE BEING MADE OF CRACK WIDTHS, AMOUNT OF CONCRETE COVER AND CARBONISATION DEPTHS, AND THE REINFORCEMENT IS BEING EXAMINED FOR CORROSION DAMAGE. THE EFFECT OF CORROSION DAMAGE ON THE STRENGTH PROPERTIES OF THE STEELS IS ALSO BEING EXAMINED. THE RESULTS OF THE TESTS ARE TO BE COMPARED WITH THOSE OBTAINED AFTER THE FIRST SAMPLING IN ORDER TO STUDY THE EFFECT OF TIME ON CORROSION.