Quo Vadis with recovery methods for bitumen emulsions

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Quo Vadis with recovery methods for bitumen
emulsions?

• Delmar Salomon
• Idaho Asphalt Supply, Inc.
• Nampa, Idaho, USA
• International Bitumen Emulsion Federation
• 4th International Symposium on Asphalt Emulsion
  Technology
• October 28, 2004 Washington, D.C.

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Overview

• No consensus on an acceptable recovery procedure
  for emulsion residue
• AEMA survey of membership in progress
• Pacific Coast Conference on Asphalt
  Specifications (User/Producer group) has worked
  on emulsion grading using SHRP
• AEMA previous round robin not entirely conclusive

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Recovery Methods in Use(USA)

• Designation Agency Test Method Description
• (A) D2441 ASTM Distillation _at_ 260ºC
• (B) D2441 ASTM Vacuum Distillation _at_ 135ºC
• (C) D2441 ASTM Oven Evaporation
• (D) Various2 Various Distillation _at_ 204ºC
  (Usually modified)
• (E) Various3 Various Distillation _at_ 177ºC
  (Usually modified)
• (F) ARIZ 504 Arizona DOT Vacuum Recovery of AE
  Residue (115ºC)
• (G) CT 331 CalTrans Oven Evaporation (Latex
  Modified AE)
• (H) MDOT 904 Michigan DOT Oven Evaporation _at_
  60ºC, 24h, glass plate
• (I) MDOT 904 Michigan DOT Oven Evaporation _at_
  ambient, 3 days, glass plate
• (J) research Texas A M Hot plate evaporation,
  continuously stirred, with a nitrogen
  blanket

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Current Methods

• ASTM D 244
• 260 C, (200 g) (R/R 1/2)75 min
• 204 C and 177 C for modified.. 75 min
• 135 C vacuum distillation.75 min
• Oven evaporation _at_ 163 C (50 g).3 hrs
• CalTrans 331 (oven evaporation/40 g)3 hrs
• Arizona DOT 504 Vacuum _at_ 115 C
• Michigan DOT oven evaporation _at_ 60C and _at_
  ambient Temp (3 days)

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Current Methods

• Stirred air flow reactor (Texas AM)
• Intended to replace RTFO oven
• Potential can be used for recovery of emulsion
  residue.

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Other potential method

• Residue by Evaporation ASTM D-244
• Moisture Analyzer
• 0.5?0.2g of emulsion
• Heating temperature 163?C.
• The test was stopped automatically when the
  change in weight was within 1 mg for more than
  140 seconds

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Moisture Analyzer
Mettler Toledo HR73 Moisture analyzer
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Residue Testing
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Conclusions

• No Consensus
• Survey in progress
• Residue determined by moisture analyzer has a one
  to one linear relationship with the residue
  determined using ASTM D-244 and potential may be
  used for non-fuel containing emulsions for
  determining use temperature
• Emulsion issues to be discussed at TRB committee
  AFK20 in 2005