history of mn/dot hma mixture design & construction significant changes by: dave holt, dick...
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History of Mn/DOT HMA Mixture Design & Construction
Significant Changes
By: Dave Holt,
Dick Ingberg, and
Earl Angell
1950’s
• Transition from Road-Mix to Hot-Mix
• Density Control
Roadmix
HMA Plant
Hveem Compactor & Heavy Pnuematic Roller
1960’s• Elimination of Hot Screening
• Mix Design for Surface Coarse
• Thin HMA Overlays/Plant-Mix Seals
Screen Deck & Drum-Mix Plants
CWA Test
Thin Overlay
1970’s• Oil Embargo
• Drum-Mix Plants
• Hot-mix Recycle
• Full-Depth HMA Design
Avg. AC Bid Price, by Mn/DOT
0
50
100
150
200
Year
Cos
t/Ton
(D
olla
rs)
Black Base Consumption, by Mn/DOT
0
0.2
0.4
0.6
0.8
119
67
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
Year
Ton
s of
Bla
ck B
ase
(Mill
ions
)
HMA Recycling
HMA Recycling
HMA Recycling
1980’s• Q/M (Quality Management)
• Volumetric Training
Training & Voids Testing
1990’s• Certified Technicians
• VMA & Moisture Susceptibility
• SuperPave
Technicians Certified per Year
0
1000
2000
3000
4000
5000
Tec
hnic
ians
Bit Street 1
Bit Street II
Bit Plant I
Bit Plant II
Immersion/Compression TestSuperpave Gyratory Compactor
2000’s
• Warranties
• Design/Build
Percent of Pavements Rehabilitated(Joint Repair for Concrete or Overlay for Bituminous)
0%
20%
40%
60%
80%
100%
0 10 20 30 40 50
Pavement Age, years
Per
cen
t R
ehab
ilit
ated
Pcc
AC
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