Introduction of asphalt pavement heater for car pavement repair

Monday - 14/06/2021 09:27
Introduction of asphalt pavement heater for car pavement repair

1. Structure characteristics
- Small heaters have a compact structure with a heating plate area ≤ 1m2, located on the fuel tank heating plate, move the machine manually by workers during the construction propulsive.
- To ensure flexibility in the construction process, the research team proposed a machine design plan including 2 heating plates joined together, including basic parts: heating plate, fuel supply system, fuel tank, moving system control system.

Figure 1. Overall structure of pavement heater (cite source:www.asphaltsealcoatingdirect.com)
1. Towing bar, 2 Pressure gauges, 3 Gas cylinder racks, 4 Heating plates, 5 Moving frames, 6.7 Moving wheels.

- Principle of operation of the machine: The fuel source is Gas (propane) or Diesel oil, other fuels, the research team chooses a gas fuel source to limit environmental pollution, the gas tank is assembled. on the machine.

- The fuel supply system will provide the right gas flow for the combustion process through the system of pipes and venturi pipes, the igniter will start and the fire will heat the heating plate.
- The heating plate is composed of heat-resistant materials such as: glass fiber, heat-resistant ceramic, metal pipe, when the flame is transmitted to these materials, it will be heated to high temperature and keep the flame from straight to the road surface.
- The height of the tow bar is designed to suit Vietnamese people's reach of 1.2 meters, the height of the heating plate with the road surface is about 2-3 cm and can be adjusted to accommodate deformations. of the road surface.

2. Hot patch technology for asphalt pavement
This technology includes stages, 1-Heat the road surface, 2- Digging and mixing the old pavement, 3-Adding new concrete materials, 4- Compacting and finishing the road surface as follows:
Step 1: Sweep off loose soil or standing water from the repaired area, use cleaning equipment and absorb water to dry at the crack mounting positions.

 

Figure 2. Road surface cleaning (Cite source: BobKieswetter-infraredheaters)

Step 2: Heat up the asphalt pavement

Move the machine to the location to be repaired, place the infrared heating plate, heating time 5-7 minutes, the pavement temperature reaches 150-1700C, reaching a depth of 5 cm, during the heating process must ensure the temperature does not burn the asphalt layer while softening the asphalt to ensure the recycling process.

Figure 3. Burning of asphalt pavement (Cite source: BobKieswetter-infraredheaters)

Step 3: Tilling and mixing old concrete pavement
After heating the pavement, dig the old pavement evenly, using a manual rake, or using a cultivator.

Figure 4. Excavation and mixing of old concrete pavement (Cite source :BobKieswetter-infraredheaters)

Step 4: Add new asphalt: Use mini mixers to add concrete to the old pavement to ensure the thickness of the repaired surface compared to the existing pavement.

Figure 5 New addition of asphalt concrete (Cite source :BobKieswetter-infraredheaters)

Step 5: Compaction to complete the road surface:
After adding new concrete and leveling evenly, use a small compactor (vibrating compactor, rammer, etc.) or mini roller to compact the surface of the added concrete.

Figure 6. Compaction and finishing of asphalt pavement (Cite source :BobKieswetter-infraredheaters)

3. Advantages of technology
- Save the source of plastic concrete materials
- Seamless welded edges. No saw cut joints to allow water seepage to deteriorate repair.
- Little new asphalt required. No unnecessary equipment, less manpower per repair. The savings can be passed on to the customer.
- Eliminate saw cutting, jackhammering, loading, trucking and disposal. There is only one trip to the job site. No hole left in the parking lot waiting for mishaps.
- Trip hazards, paving seams, isolated failures, catch basins, manhole repairs, birdbaths, potholes, utility cuts, decorative imprints and thermoplastic markings.

 

Source: This research is funded by University of Transport and Communications (UTC) under grand number T2020-PH11-004TĐ
Editor: Nguyen Van Dung

                                               

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