EXPERIMENTS ON COLD RECYCLING WITH FOAMED BITUMEN OR BITUMINOUS EMULSION AND CEMENT

Throughout the world, cold recycling is a well-established and widely used process, in virtue of the technical-structural, ecological-environmental, economic and safety advantages that it offers. In Italy, although the necessary know-how exists for the technology to be correctly applied, it has seldom been used. Companies have thus found themselves carrying out applications, even important ones, abroad. This paper, describing the results of recent work of cold recycling of road pavements in Kosovo and Italy, comes within the wider context of theoretical studies and experiments conducted at the University of Padova, which are aimed at learning more about the mechanical and rheological characteristics of the materials used in cold recycling technology. The studied superstructures were similar in that there was serious degradation characterised by accentuated visco-plastic flow, with loose chippings and holes scattered all over the surface. For the rehabilitation work, in-situ recycling with foamed bitumen or bituminous emulsion and cement was used, a method that has attained good levels of reliability. The work in Kosovo, done on regional roads within the ambits of the rebuilding of infrastructures damaged during the 1999 war in the country, and those in Italy, on stretches of minor extra-urban roads in the Province of Vicenza, are characterised by the different depth and type of intervention. For the recycling, cement was used as binder (in amounts varying from 2.5 to 3%), mixed with water (from 2.5 to 2.8%) and 65% acid bituminous emulsion or foamed bitumen (doses from 3.7 to 4%). The indirect tensile strength tests carried out on samples of recycled concrete collected from the sites and compacted with a gyratory compactor demonstrated satisfactory performances, characterised by indirect tensile strength of up to 65% daN/sq.cm in mixes with up to 6.8% voids. The paving was completed either with a multi-functional 0/20 mm mono-layer surfacing, with an average depth of 7 cm, or with a 0/15 mm bituminous wearing course approximately 4 cm deep on a 0/25 mm base course of 6 cm. The response of the pavements to vehicle stress was found to be fully acceptable. For the covering abstract see ITRD E121480.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9080288446
• Corporate Authors:

  FOUNDATION EURASPHALT

  PO BOX 255
  BREUKELEN,     3620 AG
• Authors:
  • Pasetto, M
  • BORTOLINO, G
  • SCABBIO, F
  • CARTA, I
• Publication Date: 2004

Language

• English

Media Info

• Features: References;
• Pagination: p. 494-503
• Serial:
  • PROCEEDINGS OF THE 3RD EURASPHALT AND EUROBITUME CONGRESS HELD VIENNA, MAY 2004
  • Volume: 1
  • Publisher: FOUNDATION EURASPHALT

Subject/Index Terms

• TRT Terms: Bitumen; Bituminous mixtures; Cement; Cold in-place recycling; Conferences; Foamed materials; Mix design; Recycling; Tests
• Uncontrolled Terms: Use
• ITRD Terms: 4967: Bituminous mixture; 4758: Cement; 4591: Cold in situ recycling; 8525: Conference; 4974: Foamed bitumen; 4714: Mix design; 6255: Test; 9084: Use
• Subject Areas: Data and Information Technology;

Filing Info

• Accession Number: 00980849
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 90-802884-4-6
• Files: ITRD
• Created Date: Nov 3 2004 12:00AM