Stabilisation of cinder with cement and foamed bitumen and its use as (sub)base for roads

Cinder, which is a volcanic, non-cohesive and weak gravel material, is widely available in the main rift valley of Ethiopia. The material is used as subbase and shoulder material for roads. The possible use of stabilised cinder as a base course for roads in Ethiopia is investigated in this paper. Mix design was done by determination of the optimum binder content through compaction for the foamed bitumen and cement stabilised material. Influence of compaction equipment on the cinder, was investigated with Proctor and gyratory compaction equipment. The stabilised cinder specimens in the laboratory were cured with accelerated curing methods. Load controlled monotonic tests till failure, like unconfined compressive strength and indirect tensile strength were conducted. From the strength tests it became clear that the cement stabilised cinder gave the most promising results. Changing of the grading during compaction worked very negative for the foamed bitumen. Repetitive tests were only performed on the cement stabilised cinder. From the fatigue and modulus tests good relationships were obtained for the same density levels and stress levels close to 50% of the indirect tensile strength value. Based on the seven day strength of the cement treated cinder, a pavement design analysis was done for axle load data collected from Ethiopia. According to the analysis, using a thin asphalt surfacing, a thick cement treated cinder layer is required to withstand the stresses resulting from wheel loads in the order of 9 tonnes.

Language

  • English

Media Info

  • Pagination: 14p
  • Monograph Title: First International Symposium on Subgrade Stabilisation and In Situ Pavement Recycling Using Cement, Salamanca, Spain, 1-4 October 2001

Subject/Index Terms

Filing Info

  • Accession Number: 01392487
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 8489875278
  • Files: ATRI
  • Created Date: Aug 23 2012 7:10AM