COLD BITUMINOUS MIXTURES IN THE PROVINCE OF TUCUMAM

MEZCLAS BITUMINOSAS EN FRIO CONSTRUIDAS EN LA PROVINCIA DE TUCUMAN

Until ten years ago cold bituminous mixtures with asphaltic emulsion binder were widely used in Argentina. Their use declined and they were replaced by hot mixtures for primary works and the repaving of the main highways for heavy traffic, and also where humid climate restricts the use of cold mixtures. Recently, however the need was felt to return to cold mixtures with asphaltic emulsion binder for highways carrying an average volume of traffic and for roads where the time schedule for use is not stringent. From the technical viewpoint heavy traffic does not exclude the use of cold mixtures, but sometimes makes it impossible to ensure effective curing. The structure studied is the section Ampimpa to Quilmes of provincial highway 307 of Tucuman. It was surfaced with a five-centimeter layer, using a slow setting cationic asphalt emulsion binder, on an existing granular base profiled and compacted anew. The area has a dry climate and annual precipitations are scarce, presenting ideal conditions to obtain good results. Local stone aggregates were used, screening to remove sizes greater than 3/4". Between 7 and 12% of the natural stone aggregate was under 200 mesh size, allowing to avoid filler addition to the mixture. In a one-kilometer sector slow setting anionic asphalt emulsion was used for future control. A volumetric mix plant, without granulometric control was used; spreading was carried out with a self-propelled mechanical finisher. Some special measures were taken for the curing period before intensive rolling, which took place first without flattening, and afterwards with pneumatic cylinder kneading. The structure being of recent construction it is impossible to draw any conclusion as yet, but current appearance is very good. Reduced costs as compared with hot mix has awakened interest in this province for further use of this type of mixture. For the covering abstract of the conference, see IRRD Abstract No. 207931. /TRRL/

• Authors:
  • Zalazar, L M
  • Chaler, J M
• Publication Date: 1971

Language

• Spanish

Media Info

• Features: Figures; Photos; Tables;
• Pagination: p. 246-477
• Serial:
  • Decimoseptima Reunion Anual

Subject/Index Terms

• TRT Terms: Cationic emulsified asphalt; Cold mix paving mixtures; Emulsified asphalt; Experimental roads; Flexible pavements; Humidity; Weather
• ITRD Terms: 7125: Anion; 8004: Argentina; 4993: Bitumen emulsion; 7124: Cation; 4988: Cold coated material; 2527: Dryness; 2778: Experimental road; 2944: Flexible pavement; 8104: South America; 2545: Weather
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00082761
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Conf Paper
• Files: ITRD, TRIS
• Created Date: Jul 24 1975 12:00AM