THE PERMEABILITY OF FROST PROTECTION GRAVELS

DIE DURCHLAESSIGKEIT VON FROSTSCHUTZKIESEN

THE LACK OF SUITABLE GRAVELS FOR FROST PROTECTION IN ACCORDANCE WITH ZTVE-STB 65 NECESSITATES A CHECK TO SEE WHETHER THE STRICT REQUIREMENTS OF THE SPECIFICATION ARE JUSTIFIED.AMONG OTHER THINGS THERE IS A NECESSITY,BY MEANS OF SYSTEMATIC STUDIES,TO FIND THE PERMISSIBLE LIMITS OF PARTICLE COMPOSITION OF THE FROST PROTECTION GRAVELS WITH RESPECT TO THEIR PERMEABILITY AND DRAINAGE ACTION.THE PLAN OF WORK ANTICIPATES THE STUDY OF THE PERMEABILITY OF SANDS AND GRAVEL/SANDS,AND OF GRAVEL MIXTURES COMPOSED OF BROKEN AGGREGATE WHICH ARE CURRENTLY USED ON CONSTRUCTION SITES AS A FROST PROTECTION MATERIAL.THE PROPORTION OF FINE PARTICLES (GRAINS LESS THAN 0.063MM) OF THE INDIVIDUAL SOIL TYPES IS TO BE VARIED,SO THAT A PROPORTION ABOVE THE DECREASE IN PERMEABILITY IS OBTAINED.ADDITIONALLY IT SEEMS A GOOD THING TO CARRY OUT SIMULTANEOUSLY A FROST TEST ON THE MATERIAL EXAMINED,SO THAT BY THIS MEANS THE RELATIONS BETWEEN PERMEABILITY AND FROST RESISTANCE CAN BE DETERMINED.