Hamm, part of the Wirtgen Group, has launched the Smart Compact digital compaction assistant for the compactors in the HC series. The Smart Compact records and analyzes compaction-relevant data in real time and uses it as the basis for automatic adjustment of the compaction parameters and modes, automating the compaction process.

Firstly, the operator selects the type of asphalt course to be compacted (base, binder or asphalt surface course) from the options on the display. Then Smart Compact identifies the optimum compaction mode (vibration – small or big amplitude, oscillation or static) based on the continuous data recordings and then automatically controls this in both drums.

The digital compaction assistant takes the pressure off the driver in their working day and makes operation simpler, as well as improving the surface quality thanks to the targeted application of the dynamic or static compaction, minimizing the risk of surface damage and increasing process reliability.

Smart Compact has been available for tandem rollers in the HX series since 2022. Hamm now offers the Smart Compact digital compaction assistant for the new models in the HC series with VA drum, with “VA” standing for “variable amplitude”. The 20 t and 25 t compactors HC 200i C VA and HC 250i C VA are currently available in markets with exhaust emission standard EU Stage V/EPA Tier 4f, with other markets and models due to follow.

Automatic selection of the compaction mode

The compaction mode is selected based on various parameters:

• The physical qualities of the asphalt, such as asphalt temperature and rigidity value
• The cooling behavior of the asphalt and the resultant compaction window – influenced on the one hand by known factors such as the layer thickness or the mixed material used and on the other hand by unforeseeable factors such as air temperature, substrate temperature and wind conditions.

Smart Compact also calculates when dynamic compaction is no longer advisable and automatically switches to the ECO mode. This in turn lowers the engine speed and reduces the fuel consumption by up to 15%. This improves compaction quality at the same time as preserving not only the machine but resources too.

Automatic compaction to a target value

Before compaction commences, a target compaction value is defined in MN/m², based on typical values for load-bearing capacity. Smart Compact then regulates the compaction in automatic mode until this target value is achieved. This compaction value, Smart Compaction Value (SCV), is independent of such parameters as working speed, direction of travel or frequency and is measured by the Smart Compaction Meter (SCM). This means that even when different weight classes are used, the measured values are highly comparable.

Automatic mode delivers high quality and process reliability

Both automatic mode and manual mode are possible. In automatic mode, the machine control system automatically regulates the amplitude. This ensures compaction is homogeneous and prevents over-compaction or particle crushing – also an appealing solution for inexperienced operators. As an added benefit, making fewer double passes reduces CO2 emissions and diesel consumption as well as reducing the mechanical strain on the machine.

In manual mode, the operator has the choice of five different amplitudes. Smart Compact in earthworks is controlled by the tried-and-tested Easy Drive system.

Source: Wirtgen Group