In situ pavement recycling with cement design

Road maintenance and restoration are expected to comply with modern society’s demands for sustainable development. Recycling pavement in situ with cement enhances the sustainability of road maintenance. Pavement recycling is a modern road restoration technique in which degraded pavement is transformed into a new base course reusing the existing materials. Depending on the temperature of the mix, the process is known as cold or hot recycling, and may involve operations conducted in place or at a mixed plant. Cold in place recycling of pavements with cement increases the bearing capacity and improves the durability (reducing water susceptibility and increasing strength to reduce the erosion) with the following associated environmental advantages: reduction in waste and extraction of aggregates from quarries or pits. In recent studies, the authors characterised the performance of a recycled material derived from the upper 30 cm of a road pavement consisting of 10 cm of bituminous mix and 20 cm of granular material. The present paper proposes a catalogue of cement-bound recycled pavement designs for all traffic categories and to different subgrade qualities. The calculations performed are based on Spanish traffic regulations (axle load of 13 tonne). The Brown and Pell equation is used to define fatigue-induced subgrade failure. Fatigue in the bituminous mix is determined as laid down in Spanish legislation. The main innovation is the use of a fatigue equation for the recycled layer recently developed by the authors in studies conducted to characterise this material. The designs proposed are both structurally valid and cost-effective, inasmuch as they constitute a solution for restoring the bearing capacity of any worn road more efficiently and economically than other approaches.

• Supplemental Notes:
  • EPAM 2012: Malmö, Sweden, 5-7 September: 4th European Pavement and Asset Management Conference
• Authors:
  • Diaz Minguela, Jesús
  • Linares Unamunzaga, Alaitz
  • González Cabrera, Dorys
  • Hernán Gonzalo Orden, Hernán Gonzalo Orden
• Publication Date: 2012

Language

• English

Media Info

• Pagination: 10p

Subject/Index Terms

• TRT Terms: Bituminous mixtures; Cement; Cold in-place recycling; Durability; Mix design; Pavement design; Pavement layers; Recycling; Thickness
• ITRD Terms: 4967: Bituminous mixture; 4758: Cement; 4591: Cold in situ recycling; 2952: Layer; 4714: Mix design; 3055: Pavement design; 5910: Performance; 4573: Recycling (mater); 5933: Thickness
• Subject Areas: Highways; Pavements;

Filing Info

• Accession Number: 01471689
• Record Type: Publication
• Source Agency: Swedish National Road and Transport Research Institute (VTI)
• Files: ITRD, VTI
• Created Date: Feb 4 2013 2:34PM