A COMPARISON BETWEEN CALCIUM CHLORIDE AND MAGNESIUM CHLORIDE AS DUST-BINDING AGENTS ON GRAVEL ROADS

EN JAEMFOERELSE MELLAN KALCIUMKLORID OCH MAGNESIUMKLORID SOM DAMMBINDNINGS-MEDEL PAA GRUSVAEGAR

THIS WORK DEALS MAINLY WITH THE MICROCLIMATIC CONDITIONS ON A GRAVEL ROAD SURFACE IN ORDER TO COMPARE THE DUST-BINDING PROPERTIES OF MAGNESIUM CHLORIDE AND CALCIUM CHLORIDE. HOURLY OBSERVATIONS OF THE TEMPERATURE OF THE GROUND SURFACE AND OF THE VAPOUR PRESSURE WERE CARRIED OUT BY THE SWEDISH AGRICULTURAL COLLEGE AT ULTUNA DURING THE 1971 SEASON. THESE OBSERVATIONS WERE USED, TOGETHER WITH VAPOUR PRESSURE DIAGRAMS TO DECIDE, FOR EACH HOUR DURING THE SEASON, WHETHER THE SALT WOULD REMAIN TOTALLY DISSOLVED AND THE DEGREE OF CONCENTRATION IN THE SOLUTION. THE RESULTS INDICATE THAT IT IS NECESSARY TO SPREAD 18% MORE MAGNESIUM CHLORIDE THAN CALCIUM CHLORIDE PER SQUARE-UNIT, IN ORDER TO ACHIEVE EQUAL AMOUNTS OF SOLUTION FOR EQUAL LENGTHS OF TIME. ANOTHER FACT CONTRIBUTING TO A GREATER CONSUMPTION OF MAGNESIUM CHLORIDE IS THAT MICROCLIMATIC CONDITIONS, DURING WHICH THE SALT CAN NOT REMAIN TOTALLY DISSOLVED IN EQUILIBRIUM STATE, WILL OCCUR FOR ABOUT TWICE AS LONG IN ALL FOR MAGNESIUM CHLORIDE AS FOR CALCIUM-CHLORIDE. (MAGNESIUM CHLORIDE CAN FORM A SOLUTION WITH A SMALLER AMOUNT OF WATER THAN CALCIUM CHLORIDE). CONSIDERING SECONDARY EFFECTS, SUCH AS CORROSION, THERE SEEMS TO BE NO SIGNIFICANT DIFFERENCE, EXCEPT THAT MAGNESIUM CHLORIDE IS AGGRESSIVE TO CONCRETE. THE AUTHOR FINDS CALCIUM-CHLORIDE MORE FAVOURABLE FOR DUST BINDING PURPOSES.

• Corporate Authors:

  KTH Royal Institute of Technology, Sweden

  Stockholm,   Sweden  SE-100 44
• Authors:
  • Reyier, J
• Publication Date: 1972

Language

• Swedish

Media Info

• Features: Figures; References; Tables;
• Pagination: 31 p.

Subject/Index Terms

• TRT Terms: Alternatives analysis; Calcium chloride; Chlorides; Concentration (Chemistry); Deicing chemicals; Dust; Dust control; Floppy disks; Gravel roads; Magnesium chloride; Moisture content; Pressure; Salts; Sodium chloride; Solutions (Chemistry); Steam; Surfaces; Temperature
• Uncontrolled Terms: Low cost roads
• Old TRIS Terms: Magnetic disks; Solution (Chemical)
• ITRD Terms: 7315: Calcium chloride; 7132: Concentration (chem); 4572: Dust; 2986: Low cost road; 7305: Magnesium chloride; 5920: Moisture content; 5412: Pressure; 7332: Salt (chem); 7131: Solution (chem); 6713: Steam; 6438: Surface; 6722: Temperature
• Subject Areas: Highways; Maintenance and Preservation; Materials; I35: Miscellaneous Materials; I61: Equipment and Maintenance Methods;

Filing Info

• Accession Number: 00081136
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Thesis
• Files: ITRD, TRIS
• Created Date: Apr 8 1975 12:00AM