Evaluation of dynamic shear rheometer tests for emulsions.

Details

• Creators:
  Wasiuddin, Nazimuddin ; Ashani, Saeid S. ; Islam, M. Readul
• Corporate Creators:
  Louisiana Tech University. Department of Civil Engineering
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Asphalt emulsions
  • Shear modulus
  • Rheological properties
  • Viscosity
  • Ductility
  • Elasticity (Mechanics)
  • Creep tests
  • Test procedures
• Publication/ Report Number:
  FHWA/LA.13/519;LTRC Project Number: 11-2B;State Project Number: 30000163
• Resource Type:
  Tech Report
• Geographical Coverage:
  Louisiana
• Corporate Publisher:
  Louisiana. Dept. of Transportation and Development
• Abstract:
  DSR-based rheological tests of 20 different ; asphalt emulsion residues were ; performed and relationships ; with elastic recovery (A ; ASHTO ; T301) and force ductility (AASHTO T ; 300) were investigated. In stra ; in sweep test from 2% to 52% ; , it was observed that emulsions ; prepared of hard pen base asphalt have rela ; tively lower strain tolerances. Using fre ; quency sweep data, complex modulus master c ; urves ; were constructed at 25°C to understand overa ; ll rheological behavior. Temperature sweep ; of phase angle from 52°C to 94°C showed ; that a ; maximum phase angle in the range of 75° to 85° may be used as ; a criterion for polymer identification. MSCR (AASHTO TP70) at 58° ; C ; has been recommended to replace th ; e elastic recovery test (AASHT ; O T301). At 0.1kPa creep stress, ; a minimum percent recovery of ; 25 ; and at 3.2kPa, a minimum percent recovery of ; 9 are recommended to identify the presence of polymer replacing elastic recovery t ; est ; (AASHTO T301). Also, percent recovery of MSCR and ph ; ase angle can be used to ; replace force ductility ; requirements (AASHTO ; T300). It is recommended that at 58°C, a maximum phase a ; ngle of 81° and a minimum MSCR percent recovery (at 0.1kPa ; creep stress) of 30 can be specified to ; replace the force ductility ; test (AASHTO T300). These criteria are applicable for ; emulsion residues prepared according to the low temperature evaporative method specified in ASTM D7497. However, a ; comparative study among ASTM D7497 (24 hr at 25°C and 24 hr at 60°C), ASTM D6934 (3 hr at 163°C), AASHTO TP 72 ; Method B (6 hr at 60°C), vacuum dry method (6 hr at 60°C, a method developed in this study) and field curing have been ; performed in order to develop a low temperature low duration ; recovery method. It was observed that the MSCR test on ; residue prepared with the vacuum dried method can be used ; for polymer identification replaci ; ng elastic recovery and force ; ductility tests. Finally, the current specification viscosity range for low and high viscous emulsions using the saybolt furol ; viscometer to ensure quality control an ; d quality assurance can also be replaced ; by the rotational viscometer. The ranges ; recommended are 220 - 730 cP and 5 – 90 cP (gives 98% probability) at 50 rpm and 30°C for high and low viscous ; emulsions, respectively
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28301/dot_28301_DS1.pdf
• File Type:
  [PDF - 3.99 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:b6f87579b57dfb836a1c5f34f7d648b8f98bb14057216ed5cf7b21e4512dba34ad419973a2a9915396a5aa1111d5d160cf52343734770b6045cd760d032d318d