Limiting Factors for the Applicability of Specific Types of Energetic By-Products in Roadbed Structures

Treatment of coal combustion products (CCPs) is an effective method of using otherwise very difficult applicable materials defined usually as waste. CCPs arising from the processing of coal combustion and desulphurization in power plants are represented by materials like fly-ash, slag, cinder or bottom ash. Most of them are applicable for road structures mainly for roadbeds or base courses fulfilling relevant technical conditions and specifications. Presented study uses CCPs originating from fluidized combustion of coal. A limited applicability of some types of these products in roadbed structures, if low resistance to repeated water immersion and frost impact is achieved, is one of the typical problems of CCPs. Some of them show swelling effects and risk of partly unsatisfactory environmental parameters. Alternative materials have also to declare same or better mechanical properties. Additional assessments were carried out for chemical composition (X-ray fluorescence analysis) and material phase composition (X-ray diffraction analysis) to describe defects connected to CCP utilization. The impact of cyclic capillary saturation and thaw-freezing on mixtures was the last tested parameter. There are additionally some comments for selected job sites (trial sections) where in the past CCPs have been used in the Czech Republic. In some cases after several winter seasons defects were detected. There are also examples where the soil structures have been still without any problems and failures.

Language

  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 69-76
  • Monograph Title: Geo-China 2016: Innovative and Sustainable Use of Geomaterials and Geosystems

Subject/Index Terms

Filing Info

  • Accession Number: 01608264
  • Record Type: Publication
  • ISBN: 9780784480069
  • Files: TRIS, ASCE
  • Created Date: Jul 21 2016 3:07PM