Sustainable Highways Through The Use of Carbon Sequestering Construction Materials

Exploratory research at the University of New Hampshire has demonstrated that spontaneous reactions between carbon dioxide and recycled concrete have a significant potential to permanently sequester carbon dioxide from the atmosphere. This characteristic in addition to the large quantity of concrete in construction and demolition waste streams add an additional beneficial value to utilizing recycled concrete as an aggregate in highway construction. The goal of this research is to observe the carbonation trends of recycled concrete in pilot scale berm applications under various aeration methods. Additional monitoring equipment was also placed within the piles to observe other controlling parameters which may control the rate of carbonation. Several trends were observed during the analysis of this research which coincide with previous research performed on alkaline materials by the University of New Hampshire. Notable observations include: 1) The diffusion tube used to increase the material/atmospheric interface of the passive aeration system in Pile B did not appear to have any beneficial carbonation impact compared with a passive aeration system without the diffusion tube (Pile A); 2) Active aeration increased the carbon dioxide concentrations within sections of that pile to near atmospheric concentrations but other locations within the same pile, however, had much lower concentrations; 3) Higher percentages of calcium were carbonated in locations which experienced higher carbon dioxide concentrations during the period of this study; and 4) Calcium below the surface of the aggregate experienced less carbonation than observed on the aggregate surfaces.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; References; Tables;
  • Pagination: 43p

Subject/Index Terms

Filing Info

  • Accession Number: 01531736
  • Record Type: Publication
  • Files: TRIS, ATRI, USDOT
  • Created Date: Jul 18 2014 12:12PM