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Road construction asphalt surface course

Paving a surface layer in chipping mastic design

Project data:

  • Two-layer surface layer paving with SMA 8 S 25/55-55 A
  • Bitumen: 25/55-55 A with/li> 25 % calcium hydroxide in filler component
  • Mat height: 3.5 cm
  • Length of construction: approx. 4.5 km
  • Daily output: 1.400 t
  • Voids content: max. 3 %


Compaction:

  • Full area paving 11.60 m with two pavers (hot on hot) + feeder
  • 1 x BW 161 AD-5 AM (10 t)
  • 3 further rollers (8-10 t-class)
  • 1 x BW 213 AD-3 (13 t)
  • Number of passes:
    6 x vibration
    2 - 4 x static (ironing)
    Rolling speed: 4-6 km/h




Chipping material must be spread at a sufficiently high asphalt temperature, so that it can still be rolled in.

In most case the number of rolling passes is based on experience. However, during this construction a target value EVIB (MN/m²) could be determine3d by means of orientation measurements with an isotopic sounding device.

The advantage: Once the target value is reached, a green colour bar indicates that no further passes are required. Apart from this, the display shows valuable information, like e.g. the asphalt temperature and the currently effective amplitude.

 
Paving a surface layer A3 near PassauPaving a surface layer A3 near Passau
Parallel quality control on site using BW 161 AD-5 AM and isotopic sounding apparatus. Positive result: 98 – 100 %Parallel quality control on site using BW 161 AD-5 AM and isotopic sounding apparatus. Positive result: 98 – 100 %

BOMAG ASPHALT MANAGER 2

For large area compaction tasks, the system AM 2is an important assistant for optimizing and controlling compaction.

The current version is particularly simple to operate by the user. It enables the selection of e.g. compaction programs for typical asphalt layers. An automatic amplitude control then ensures well adapted compaction.

Overcompaction in combination with jumping of the drum or an excessive number of passes is thus avoided.

Quality control with BOMAG ASPHALT MANAGER: An uniformly good compaction can simply be better achieved if good information is available. In this respect the ASPHALT MANAGER is highly suitable for supporting the quality control efforts of the user on the construction site. This is of particular significance under unfavourable weather conditions causing quick cooling down of the mix.

In case of SMA compaction with vibration is particularly beneficial, because the intensity of compaction is automatically adapted during each new pass. This avoids quality related problems with bitumen accumulations on the surface or the crushing of grains.
 
Display with compaction progress and current asphalt temperatureDisplay with compaction progress and current asphalt temperature
Paving a surface layer A3 near PassauPaving a surface layer A3 near Passau

 

Paving a surface layer in chipping mastic design, Germany

Project data:

  • Wearing course: SMA 8 S   
  • Bitumen: 25/55-55 A
  • Total area: 70.000 m²
  • Thickness: 3,5 cm
  • Production per day: 2.500 t


Requirements and compaction:

  • Compaction requirement: 98%
  • After the 2. rolling pass: Chip spreading
  • Chipping material: Diabase/quartzite
  • Particle size: 2/5 mm
  • Quantity: 0.8 kg/m²


The chipping material must be spread at a sufficiently high asphalt temperature, so that is can still be rolled into the surface.  
 

 

Six-lane extension of the BAB A1 between Bramsche and Osnabrück, Germany

Project data:

  • Paving a surface layer: SMA 11 S
  • Continuous paving with 2 pavers ("hot on hot") and one feeder each
  • Bitumen: 25/55-55 A
  • Mat height: 4 cm
  • Daily output: 1.100 t


Requirements and compaction:

  • Compaction requirement: 97%
  • Main compaction with 2 tandem rollers BW 174 AD AM 2 and
  • BW 174 AD-AM (10 t each) with up to 6 passes
  • Working speed: 6 km/h
  • Post compaction: static/ironing
  • BW 184 AD (13 t) and a tandem roller (10 t)


The surface layer SMA 11 S with polymer modified bitumen 25/55-55 A was treated with 6 vibration passes. The following settings (see photos) were chosen under favourable ambient temperatures (20 °C) and light wind.

The Evib target value (320 MN/m²) was reached after 6 passes. Post compaction (ironing) mainly took place statically with a BW 184 AD-AM (13 t) and another 10 t roller.
 

 

Placement of a wearing course with porous asphalt, highway A8 between Roth and Nürnberg-Süd, Germany

Project data:

  • Two layers asphalt construction with PA8/ PA16 (porous asphalt)
  • Bitumen: 70/100 with 33 % of bituminous rubber-granules
  • Layer thickness: PA8: 4 cm/ PA16: 3,5 cm
  • Total length: ca. 5 km
  • Daily output: PA8=2.200 t/ PA16=3.200 t
  • Void content: 24-28 %


Compaction:

  • Full-width placement with two finishers (hot against hot)
  • Five tandem rollers BW 174 AP-AM with ASPHALT MANAGER, four rollers equipped with mit BCM-Net:
    • Compaction (static) started at a distance of ca. 30 m to finishers
    • Surface temperature down to 80 °C
  • No. of static passes: 4x on PA8/ 6x on PA16
  • Roller speed: 4-6 km/h

Number of roller passes: estimated after conduction of a prior test (testing field). Special configuration: No pre-compaction via light tandem rollers (2,5-3 t). Main compaction (static) is done via 10 t. Compaction started at a distance of ca. 30 m behind the finishers. Asphalt temperature: not more than ca. 80°C (measured via a roller integrated infrared sensor).

Quality control with BOMAG BCM-Net: For sake of quality control on big-scale asphalt projects it is always crucial to assure an even distribution of passes for all rollers involved. To prove that, BOMAG supplied four rollers with “BCM-Net” – a surface covering control system based on a roller network (WLAN) at site. All rollers combined in the network shared their own compaction results in terms of No. of passes and surface temperatures with the others and at realtime.

BOMAG BCM-Net: A surface covering compaction control system for use on asphalt (SCCC-Asphalt) comprising up to ten rollers in a network (WLAN) in order to share their compaction data. All rollers involved see the compaction progress mutually on a display (BCM05) – thereby monitoring the asphalt surface temperature, No. of passes and (if required) the EVIB-value (MN/m²). The information is shown on a color screen updated after short intervals.
 
 

 

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