Evaluation of Laboratory Mix Design and Field Performance of Asphalt Emulsion and Cement Stabilized Full-Depth Reclamation Project in Texas

Full depth recycling (FDR) techniques have been used by the Texas Department of Transportation (TxDOT) for roadway rehabilitation since the early 1990s (1). The concept of using a dual-base stabilization process in full depth reclamation has been used in Texas based on the observed problems with single treatments of calcium-based stabilizers, such as cement. It is well known that cement treatment provides a durable base material but is prone to environmental cracking. Emulsions by themselves have advantages, like improved moisture resistance. However, their limitations are that the early strengths are low and that traffic has to be kept off the section for an extended period, which is unacceptable in many reclamation projects. By combining treatments it was hoped that a flexible, strong, waterproof, and durable base could be created with good early strength gain. In late 2005, TxDOT drafted a special specification on emulsion treatment. According to this specification the amount of calcium-based additive and optimum amount of emulsion must meet, among other requirements, a minimum indirect tensile strength (ITS), unconfined compressive strength (UCS), and retained UCS after 10 days of capillary rise. Farm to Market (FM) 429 in Kaufman County, Texas was among the first FDR projects constructed, using a combination of 4 percent emulsion and 1 percent cement, under this specification. The Texas Transportation Institute (TTI) conducted a full-scale laboratory and field investigation of FM 429 to evaluate the TxDOT mix design specification. The details of which are presented in this paper.

Language

  • English

Media Info

  • Media Type: DVD
  • Features: Figures; Photos; References; Tables;
  • Pagination: 11p
  • Monograph Title: TRB 87th Annual Meeting Compendium of Papers DVD

Subject/Index Terms

Filing Info

  • Accession Number: 01090316
  • Record Type: Publication
  • Report/Paper Numbers: 08-2439
  • Files: TRIS, TRB
  • Created Date: Jan 29 2008 4:51PM