Dynapac

Seismic Asphalt is the innovation that lets the roller determine the optimum frequency for any compacted material relative to the asphalt mix temperature. Seismic Asphalt constantly monitors the stiffness and temperature variations, and automatically adjusts the vibration frequency to the changing conditions.

Seismic Asphalt provides qualitative, economical and environmental benefit for contractors
• Gentle compaction during the first passes and increased performance at the cooler end of the scale
• Lower noise levels thanks to a lower vibration frequency
• Lifetime fuel consumption and CO2 reduction by up to 25% with EcoMode engaged
• Reduced machine wear (increased lifetime)

CC2200 VI - CC7000 VI, CX8, CX9 including combi and CO oscillation rollers

In addition to the decals on the side of the machine and front/rear of the cab/ROPS, it will be shown in the machine’s display. Seismic is set as default but can be turned off via the menus on the touch screen. The Dynapac Compaction Meter with EVIB (DCM EVIB) is standard so the accelerometer in the drum is mounted along with the eccentric position sensor. Seismic also uses the surface temperature of the asphalt mix to determine the optimum frequency setting. The machines are fitted with two IR temperature sensors, one in the front and one in the back, to always measure the temperature ahead of the machine in the current driving direction.

No, we offer Seismic only as a factory installed option.

Seismic Asphalt is a Dynapac Patent since 2025.

Up to 25% in combination with EcoMode.

Yes, it certainly is. Initial tests made at the Dynapac research facility proved the technology has been followed by field tests. The latter further reinforced the performance while also showing the claimed savings.

No, we are using the same proven mechanical components we have used for several years. The Seismic system is algorithm based adding no extra complexity or service need to the roller.

Conventional vibratory compactors deliver a rapid succession of impacts to the soil surface at a frequency that is either pre-set at high or low amplitude or at a frequency that is adjusted manually. Normally around 45–67 Hz (2700–4000 vpm). Seismic Asphalt does it differently. Since the drum and the asphalt act as one dynamic system, several benefits can be found from this system’s natural frequency. At the natural frequency, the drum amplitude is enhanced significantly, since energy is automatically fed to the drum and asphalt system at exactly the right time. This, in turn, maximises the contact force between the drum and the ground, yielding maximised compaction and energy efficiency. Now we are in the range of 45 Hz (2700 vpm) and up depending on type and stiffness achieved. Seismic Asphalt starts compaction on hot/warm mix at frequencies slightly above the natural for a gentle initial approach when the asphalt is easily compacted. As the mix cools, it becomes successively more difficult to compact. To account for this, the system adjusts the frequency closer to the natural frequency, thereby increasing the resulting amplitude and compaction efficiency.

It is very difficult to manually set the optimum vibration frequency. It is different from material to material and also depends on the layer thickness. In addition, the natural frequency also changes with increasing density and stiffness in the material. Because of these factors, it's a huge benefit to let Seismic Asphalt adjust the vibration frequency automatically. The result is better economy and quality.

Yes, look here for more information

Seismic Soil

You’ll find more right here

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