TG2: "The design and use of foamed bitumen treated materials": shortcomings and imminent revisions

In 2002, the Interim Technical Guideline TG2 was released in South Africa as a best practice document. The main purpose of the document was, as a matter of urgency, to provide a standardised methodology for mix design, pavement design and construction of foamed bitumen treated materials. The primary objectives were to assist road authorities in the adjudication of alternate designs for rehabilitation projects that incorporated this technology and to assist practitioners in the correct design formulation and construction requirements. This paper discusses the shortcomings of TG2 in the context of the revisions that are currently being implemented in South Africa. It describes the immense challenges faced in developing a guideline that addresses both foamed bitumen and bitumen emulsion stabilising agents. It outlines new tests being proposed for mix designs that address flexibility, shear properties and durability. It also provides details of the database of long term pavement performance (LTPP) sections that include layers treated with either foamed bitumen or bitumen emulsion, seven years and older, and how this data has been used to develop heuristic (or knowledge) based pavement design procedures. (a)

• Authors:
  • JENKINS, K
  • COLLINGS, D
  • JOOSTE, F
• Publication Date: 2008-6

Language

• English

Media Info

• Pagination: 16P
• Serial:
  • RECYCLING AND STABILISATION CONFERENCE, 2008, AUCKLAND, NEW ZEALAND
  • Publisher: NEW ZEALAND INSTITUTE OF HIGHWAY TECHNOLOGY (NZIHT)

Subject/Index Terms

• TRT Terms: Bitumen; Building materials; Emulsions; Foamed materials; Mix design; Pavement design; Specifications; Tests
• ITRD Terms: 4963: Bitumen; 4993: Bitumen emulsion; 4974: Foamed bitumen; 4555: Material (constr); 4714: Mix design; 3055: Pavement design; 177: Specifications; 6255: Test
• Subject Areas: Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01120912
• Record Type: Publication
• Source Agency: ARRB
• Files: ITRD, ATRI
• Created Date: Feb 5 2009 7:30AM