hma joint construction

Wednesday, April 23, 2014 San Diego, CA

•  Transverse  Joint  Construction  Methods  

•  Longitudinal  Joint  Construction  Methods  

•  Proper  Joint  Luting    

JOINT  CONSTRUCTION  

•  Good  joints  are  no  mystery  

•  Training  &  practice  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

Butt  Joint  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

Rolled  Mat  

Rolled  Mat  

New  Mat  

Paper  

Papered  Transverse  Joint  

Remove    paper    &  ramp  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

Remove Tapered area

•  Center  tow  point    •  Set  width  •  Set  crown    •  Set  extender  

slope    &  height  

•  Use  boards  that  allow  for  compaction  rate  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

A  good  rule  of  thumb  is  to  raise  the  screed  20  percent  more  than  the  compacted  thickness.  

JOINT  CONSTRUCTION  

•  First  step  is  screed  pre-­‐heating  

JOINT  CONSTRUCTION  

Fuel  Pump    Spraydown  /  Burner  

Glow  Plug  /  Fan  Switches  

JOINT  CONSTRUCTION  

•  Null  screed  

JOINT  CONSTRUCTION  

•  Introduce  angle    of  attack  

•  Crank  until  resistance  is  felt  

JOINT  CONSTRUCTION  

•  Fill  auger  chamber  half  full  

•  Conveyor  manually  

•  Auger  manually  •  Shovel    if  needed  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

•  Check  smoothness  before  the  mat  cools  to  ensure  a  good,  smooth  joint  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

What Happened Here?

Longitudinal  Joints  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

Staggered  Paving  Joints  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

Notch  Wedge  (Caltrans  Spec’s)  

JOINT  CONSTRUCTION  

Notch  Wedge  Joint  Maker  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

Compacted Mat

Uncompacted Mat

Typical Overlap on Longitudinal Joints

Thickness of Rolldown

1 – 1½ inches

JOINT  CONSTRUCTION  

Compacted  Mat  

Uncompacted  Mat  

Mix  “Bumped  Back”  to  Joint  

JOINT  CONSTRUCTION  

•  Why  is  this  wrong?  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

JOINT  CONSTRUCTION  

Quality  Joints  are  

No  Accident!  

JOINT  CONSTRUCTION  

Questions??  

JOINT  CONSTRUCTION