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Technical report #1

13 Jan 2021

Story, Paving


By Soenke Demuth, Dynapac Technical Specialist 

The recent launch of our high compaction screed system represents a significant breakthrough in job site management, helping end-users to achieve better pre-compaction rates across a project. At the same time the system also avoids crashed stones or pumped up bitumen, for all layers and throughout the whole layer thickness. 

The new system operates on our proven four-tube design and supports the delivery of material to perfect quality on even the thinnest of layers. To achieve this, we have replaced the standard vibration unit with a fully redesigned new high compaction unit, one for each screed section

Operated through our screed mounted control panel, team members can have direct access to compaction controls, which include tamper, vibration and the setting of the additional available compaction pressures. All of which display on the illuminated control panel. 

The new high compaction unit is capable of delivering 3000 RPM with a maximum high compaction pressure of 70 bar across all four sections simultaneously. This is made possible thanks to an integrated lift system which allows for the adjustment of the compaction coming from the high compaction unit (HCU) with the hydraulic pressure fully independent from the vibration RPM.

In practical terms, this means the screed operator can control and adjust pressure and vibration from one of the two screed remote control panels, positioned either side of the screed or the main operator panel. These intuitive controls come with common pre-settings for the different courses types and adapt to the individual needs of the jobsite, using the expertise of the operator. These skilled individuals will be able to take into consideration all the variables from environmental conditions to the mix of material to optimise the surfacing process. For example, material mixes may include virgin or recycled products and different variable levels of bitumen.

By having this ability to control the pressure and the vibration RPM operators can always reach the compaction level, they need for the jobsite conditions. This applies to a whole range of jobs from thin or thick layers as the system still delivers the maximum compression possible by combining higher vibration frequencies and the additional pressure to push the unit and material forward.

For operators on different job sites, dealing with variables of material behaviour and requirements to combat environmental conditions, the ability to create the right balance by adjusting the RPM and pressure individually, supports greater productivity and a high-quality final finish. 

When it comes to the operation of the screed on site, operators of the Dynapac machines will witness a noticeable difference in lower noise levels of 104dB, compared to other OEM equipment. And with our screeds used for long shift periods, the reduced wear benefits of the new high compaction unit will increase reliability and uptime as the design means there are no frictional contacts inside it.

Laying the road to safer automation

With screeds often used on busy sites and for night surfacing projects, keeping individuals safe is a number one priority. We recognise that laying the road to autonomy is all about keeping screed operation safe and straightforward, by removing manual processes wherever possible. In the latest design of our screeds, we have combined two Dynapac Assistant Systems. 

The first is our MatTracker sensor system, designed to take the operator out of the danger area of oncoming traffic. To do this MatTracker uses sensors to automatically monitor the position of the screed against, existing mats or edging stones. The system then moves the screed horizontally, in and out to ensure correct material placement.

With MatTracker ensuring the right horizontal positioning of the screed, this automation can remove the operator from inside the safety area of the machine and potential running traffic. To ensure operators can remain safe, we have also combined MatTracker with our second system, which is integrated levelling. 

This uses integrated factory fitted technology from our machine control technology partner, MOBA. The MOBA integrated system uses its sonic sensors which can link with its MOBA BigSki software or other third-party systems. We can also support 3D screed levelling independent from our existing base solution using our partnerships with 3D machine control specialists like Trimble, Topcon and Leica Geosystems. These systems can be retrofitted into our Can Bus to use the machine GPS location, and jobsite data measured as the screed performs its operation. 

Reducing fuel burn by optimising compaction

Using the high compaction screed not only delivers better high-pressure layering, but it also has the added benefit of saving up to 50% of the roller passes needed to reach the optimised compaction levels. This reduces both fuel and plant movements onsite, making the job site safer and more environmentally friendly, even in the toughest of conditions.

Customisation for increased functionality and safety

Thanks to the versatility of Dynapac products, depending on the different screed requirements an end-user has, it’s important to understand how to specify a screed solution and what options are available. 

It all starts with understanding what types of work you are looking to undertake and what demands this work will have on which may require additional safety or technology solutions, with this in mind, Dynapac has added several options. The first relates to our side shields which limit the material flow to the sides for more defined edges. Here we have a number of different options from standard manually adjusted to affordable hydraulic options, right the way through to fully foldable options.

The fully foldable option removes any manual lifting or coupling whilst eliminating disassembly. This means operators can set up machines for work and transportation in a matter of minutes. This option is popular with countries where transport widths have to meet tight regulations of anywhere between 2.55m to 3 metres. All side shield options can couple with an edge former offering 30 to 70 degree angle options to form the edge of the mat.

With side shields improving safety for operator, another key option is lighting to support night time operations. Here full lighting arrangements can be added to the machine, including options for side shields, delivering safer working environments. With equipment used across the world in different jobsites, with different materials there are modular electrical and gas heating options available, including a heating rod to prevent material from sticking to the screed.

Tailoring your Dynapac machine can make a real difference to efficiency, productivity, quality and safety, so it is always worth talking to one of our specialists about how you intend to use our products. 

For more information on the Dynapac high compaction screed system, please contact:  
Soenke Demuth, Dynapac Product Manager for Large Pavers 
Telephone: +494407972325 

About Dynapac 
Dynapac is a leading supplier of high tech soil and asphalt rollers, light equipment and pavers, committed to strengthen customer performance by being a partner on the road ahead. Dynapac is represented worldwide via its own regional sales- and service offices, and cooperates with an extensive and professional distribution network. Headquartered in Wardenburg, Germany, Dynapac has production facilities in Europe, South America and Asia. Dynapac is part of the FAYAT Group.