THE USE OF SILANE TO REDUCE STRIPPING IN ASPHALT PAVEMENTS. FINAL REPORT

Previous results have shown that treatment of gravel with a 1/150 dilution of an organofunctional silane in water (Union Carbide Corp., A-174) prior to the addition of asphalt, significantly reduces asphalt loss even in the presence of vigorous microbial activity. In the present study, it has been shown that the amount of moisture in/on gravel prior to treatment with silane does not affect the ability of the silane-treated gravel to retard stripping. Silane-treated gravel may be stored in the field for at least 45 days without losing its effectiveness. The silane-treated gravel retains its ability to resist asphalt loss after exposure to temperatures up to 266 deg C (510 deg F) and possibly up to 360 deg C (680 deg F) for 15 minutes. The use of silane to treat recycled asphalt pavement was shown to be of questionable value under the condition of the test. Immersion of gravel in silane solutions for seconds or a few minutes was shown to be just as effective as immersion for 30-60 minutes. Two microbial cultures capable of utilizing silane were isolated and found to be mesophilic aerobes. No anaerobic or thermophilic microorganisms capable of utilizing silane were found.

• Corporate Authors:

  Mississippi State University, Mississippi State

  Department of Biological Sciences, P.O. Drawer GY
  Mississippi State, MS  United States  39762

  Mississippi State Highway Department

  P.O. Box 1850
  Jackson, MI  United States  39215

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Brown, L R
  • Pabst Jr, G S
  • Marcev, J R
• Publication Date: 1989-10

Media Info

• Features: Figures; References; Tables;
• Pagination: 54 p.

Subject/Index Terms

• TRT Terms: Asphalt concrete; Bacteria; Chemical reduction; Measures of effectiveness; Pavement stripping; Silane; Temperature
• Uncontrolled Terms: Aerobic bacteria; Effectiveness
• Old TRIS Terms: Reduction
• Subject Areas: Highways; Materials; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00491916
• Record Type: Publication
• Report/Paper Numbers: State Study No. 95, FHWA/MSHD-RD-89-95
• Files: TRIS, USDOT, STATEDOT
• Created Date: Mar 31 1990 12:00AM