RETARDATION OF THE HARDENING OF BITUMEN IN PAVEMENT SERVICE BY THE ADDITION OF HYDRATED LIME

The hardening obtained by the exposure of thin films of bitumen at 100 degrees C to the action of oxygen (bitumen durability test treatment) is retarded by the addition of hydrated lime (hl) or a filler containing hydrated lime such as cement kiln dust (ckd). This action is not affected by soaking the bitumen/hl or ckd mixtures in water for 16 days prior to testing. With mixtures containing 12 per cent by mass of hl (equivalent on bitumen/hl ratio of about 1 per cent by mass of hl in a plant mix), the exposure time required to reach the critical viscosity of the durability test is increased by about 50 per cent. Lower concentrations of hl produce less retardation. To investigate whether hl is a useful bitumen antioxidant under pavement service conditions, a preliminary spray sealing trial using hl concentrations of up to 6 per cent in the bitumen has been laid in Victoria. Details of the laying of this trial are given. Further spray sealing trials with higher concentrations of hydrated lime in the bitumen are desirable. (Author/TRRL)

• Corporate Authors:

  ARRB

  Melbourne, Victoria  Australia 
• Authors:
  • Dickinson, E J
• Publication Date: 1981-4

Media Info

• Features: Figures; References; Tables;
• Pagination: 13 p.

Subject/Index Terms

• TRT Terms: Bitumen; Bituminous pavements; Calcium hydroxide; Calcium oxide; Cement; Cement kilns; Concrete hardening; Durability; Dust; Experimental roads; Flow; Fluid dynamics; Hardness; Ovens; Oxidation; Retarders (Chemistry); Sampling; Surfacing; Viscosity; Wearing course (Pavements); Weather; Weather resistance
• ITRD Terms: 4963: Bitumen; 5910: Durability; 2778: Experimental road; 5430: Flow (fluid); 4722: Hardening; 4574: Lime; 7157: Oxidation; 6253: Sampling; 2972: Surfacing; 5936: Viscosity; 2980: Wearing course; 2545: Weather; 5940: Weather resistance
• Subject Areas: Geotechnology; Highways; Materials; Pavements; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00342954
• Record Type: Publication
• Source Agency: ARRB
• Report/Paper Numbers: AIR 118-6 Monograph
• Files: ITRD, TRIS, ATRI
• Created Date: Jan 29 1982 12:00AM