CE403 Construction Methodology

1
CE403Construction Methodology

• Concrete Asphalt Paving

2
Concrete Road Construction Operations

• Cast In Place
• Traditional Methods
• Slip Form Paving
• Pre Cast

3
Portable Concrete Plant Doing Batching
4
On Site Batching of Concrete

• Reduce haul costs
• Reduce risk of delay due to traffic congestion
• Improved safety to traveling public
• Requires real estate.

5
Placement
Reduce height of free fall to 5 feet.
6
Strike-Off

• Aka Screeding
• Purpose to cut off excess concrete and bring
  surface to grade.

7
Bull Floating
Aka Darbying Purpose to eliminate high and low
spots and to embed large aggregate particles
8
Rotary Finisher
Aka Floating Purpose to embed aggregates just
beneath the surface to remove slight
imperfections and to compact the mortar at the
surface for additional finishing operations
9
Precast and Roads

• Mostly used for bridge decks
• Better quality control
• Ease of installation
• Reduce weather dependency
• Reduce environmental impacts

10
(No Transcript)
11
Slip Form Paving
12
Asphalt
13
Production of Asphalt Mixes

• Asphalt and Other Bituminous Materials
• Bituminous materials include asphalt and tar.

14
Asphalt Production
15
Asphalt Paving Example
16
Laydown Machine
17
Material Handler
18
Pneumatic Rollers
19
Vibratory Steel Rollers
20
Asphalt Cold Planers

• Why?
• Remove fragmented layer of pavement
• Preserve drainage (curb and gutter)

21
(No Transcript)
22
Blue Grass Airport Runway Paving

• Scope of Work
• First ever full closure of Blue Grass Airport
• 7003 feet long, 150 feet wide, 3 inches deep
  Asphalt Overlay
• Placed 24,000 tons of asphalt from 1000
  truckloads
• Project Cost 4.5 million
• Schedule Duration 42 hours
• Friday 08/26/94 at 900PM to Sunday 08/28/94 at
  300PM

23
Complete Airport Shutdown

• Conventional approach is to pave shorter sections
  for 4 hour per night over 10 days
• Results in lower asphalt quality due to extra
  joints
• First ever full closure of Blue Grass Airport
• Lasted 42 hours
• From Friday at 900PM to Sunday at 300PM
• Allowed contractor full access to the runway
• Created a smoother, better quality runway
• 500,000 cost reduction

24
Asphalt Plant Location

• 2 Mountain Enterprises (M.E.)plants
• Directed by Central Kentucky Asphalt during
  construction
• Fast (250 tons/hr) and close (4 miles from
  airport)
• Thus responsible for 6 passes
• 1 M.E. plant 1 Allen Co. plant
• Directed by Allen Co. during construction
• Slower (200 tons/hr) and further (8 miles away)
• Thus responsible for 4 passes

25
Paving Sequence

• Paving started at runway centerline
• Pavers sequenced 300 feet apart
• M.E. paver
• M.E. paver

26
Paving Sequence

• Paving started at runway centerline
• Pavers sequenced 300 feet apart
• M.E. paver
• M.E. paver
• Allen Co. Paver

27
Paving Sequence

• Paving started at runway centerline
• Pavers sequenced 300 feet apart
• M.E. paver
• M.E. paver
• Allen Co. Paver
• Allen Co. Paver

28
Paving Sequence

• Paving started at runway centerline
• Pavers sequenced 300 feet apart
• M.E. paver
• M.E. paver
• Allen Co. Paver
• Allen Co. Paver

29
(No Transcript)