STRUCTURAL DISTURBANCE CAUSED BY THE VIBRATION OF JOINTS

GEFUEGESTOERUNGEN DURCH EINRUETTELN VON FUGEN

IF A JOINT IS VIBRATED INTO PLACE, TEARING OF THE FRESHLY FINISHED SURFACING IS AVOIDED. HOWEVER, AT THE EDGES OF THE JOINT THE VIBRATION CAUSES THE FORMATION OF SLUDGE AND DEFORMATION OF THE CONCRETE, AND THIS LEADS TO SPALLING. ON EXPERIMENTAL SECTIONS IN WHICH THE JOINTS ARE BEING VIBRATED INTO PLACE, THE VIBRATION FREQUENCY, CRACKING DEPTH AND WIDTH AND AFTER-TREATMENT OF THE JOINTS ARE BEING VARIED. AFTER THE CONCRETE HAS HARDENED CORES ARE TO BE TAKEN NEAR THE JOINTS SO THAT CHARACTERISTIC VALUES CAN BE DETERMINED. THESE VALUES ARE TO BE COMPARED WITH THE CONCRETE AWAY FROM THE AREA OF THE JOINT. ON THE BASIS OF THE RESULTS PROPOSALS ARE TO BE PUT FORWARD AS TO HOW JOINTS CAN BE VIBRATED INTO PLACE WITH A MINIMUM DISTURBANCE TO THE STRUCTURE AROUND THE JOINT.