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14th Colloquium on Asphalt and Bitumen in Pictures and Words


The largest professional and international meeting, organized between 28th and 29th of November 2013 is behind us. Every two years with cooperation of energy company Petrol, it is organized by Asphalt Pavement Association of Slovenia. We have had an ambitious goal to exceed, or at least repeat the previous, the 13th Colloquium on Asphalt and Bitumen (CAB). Numbers, which you can see in the comparison table and satisfaction of participants in particular, convinced us that we have managed to prepare the meeting, which met all the expectations of both the organizers as well as domestic and international audiences. Preliminary colloquium was exceeded in most indicators and also a great atmosphere was provided.

Colloquium on Asphalt and Bitumen has a character of a convention for Slovenian asphalt industry. Therefore, the respective conclusions will guide our work over the next two years. Great desire of asphalt branch, therefore, is that these conclusions apply to all who are in any way related to asphalting activity. Above all, we have in mind the Clients (there are a few hundred in Slovenia), contractors and producers of asphalt, suppliers, engineering, institutes and all others. After all we all drive on asphalt and it is in the interest of everyman that the asphalt surface is even, safe and ecologically sound. For all of the above, we in the Asphalt Pavement Association of Slovenia with our work strive for.







14. CAB

13. CAB





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Number of present countries












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Invited technical lectures or round tables (participants)




 3 + 1






Special Invited Lectures












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Technical Presentations












        *Austria, Belgium, BIH, Croatia, Italy, Germany, Holland, Norway, Srbia, Switzerland and Slovenia



 Marijan Prešeren, vice president of ZAS in general direktor CGP, d.d

Marijan Prešeren pointed out the difficult situation in which construction contractors have found themselves. Unfortunately, the contractors of construction work are still insufficiently aware of how difficult it is today to obtain a bank warranty, we still have unreasonably long warranty periods and the only criterion to tender is still the lowest price. In Slovenia, we have 407 public clients and each of them has its own procurement policy, contract custody and termination of works. The situation is unsustainable, and he expressed an appeal that those shortcomings should be ultimately improved and corrected.


 Jurij Kač, general direktor DRI upravljanje investicij, d.o.o.

 Jurij Kač stressed the importance of the Colloquium for the Slovenian road construction profession and expressed satisfaction over the contribution of asphalt branch to sustainable and environment-friendly construction. Engineer DRI as the largest engineering-consulting company in the country will continue to strive to raise the technical culture and expertise. The importance of such meetings is the development of the profession, collaboration, socializing and networking, and he will continue to support this and similar associations personally and as a leader of the company.


 Doc.dr. Peter Lipar, representative FGG – PTI

The situation at the University is because of the well-known economic situation, very difficult. University teachers are all repeatedly forced to intervene with new approaches and, unfortunately, also in improvisation, to achieve the appropriate level of teaching and the students' knowledge. In this context, dr. Peter Lipar has stressed the importance of cooperation with professional associations. The cooperation between the FGG and ZAS has been good in the past, and wishing to do so even more dr. Lipar offered his hand to Association for the intensification of cooperation.

Technical sessions with papers and presentations followed. All papers are published in the Proceedings.



4.1 Section 1: Basic Materials in Asphalt Industry - Aggregates and Bitumen; Moderator: Mrs. Naglič

(referents: Mr. Zehmann, Mrs. Dr. Mladenovič, Mrs. Dr. Sorensen, Mr Bašelj, Mr. Kammerer

Eric Zehmann, Mineral- Strabag (A): Hard rock mining and processing in the Alps in consideration of enviromental protection

Dr. Ana Mladenovič, ZAG (SLO): Slag as aggregate in road construction - opportunities and risks

Anja Sorensen, ARBIT (D): European Standardisation - On our way to Performance Related Specifications

Roman Bašelj, IGMAT (SLO): Test results of bitumen in Slovenia

Siegfried Kammerer, OMV (A): Influence of high modified PmB on the properties of asphalt with RAP


 4.2 Section 2:  Long Term Development of Asphalt Technology; Moderator: Mr. Čotar

(referents: Dr. Bidermann, Mr. Aaberg, Mr. T.  Willenpart, Mag. Beuving)

Dr. Andreas Biedermann, AMANN (CH): Low temperature asphalt - asphalt producer view

Arne Aaberg, FAV (NOR): Warm Mix Asphalt in Noerway - a promising start

Tomaž Willenpart, DRSC (SLO): Implementation of the public investment in order to ensure the rules of the proffession and the principle of legality

Egbert Beuving, EAPA Brussels (EU): Asphalt Marketing


4.3 Section 3: Asphalt Rubber; Moderator: Mr. Prosen

(referents: Mr. Weixlbaum, Mr. Sadzulewsky, Mr. Cotič, Mrs. Dr. Antunes)

Max Weixlbaum, TPA, Gestrata (A): Asphalt Rubber Modification in Austria - use in practice

Siegfried Sadzulewsky, Genan NRW GmbH (D): Asphalt and bitumen modification with rubber in Germany - first regulations of FGSV

Zvone Cotič, Structum (SLO): The use of asphalt rubber for noise reduction on motorway test field Divača - Kozina

Dr. Ines Antunes, Asphalt Rubber Italy (I): The successful use of asphalt rubber in Italy


4.4 Section 4: Sustainable Asphalt Pavements; Moderator: Mrs. Cezar

(referents: Mrs. Dr. Petkovškova, Dr. Orešković, Mrs. Zagorc,Mr. Jurgele)

 Dr. Ana Petkovšek and Matej Maček, FGG (SLO): Frost endurance of pavements in consideration of hydraulic heat conductivity of materials in freezing zones

Marko Orešković, Jelena Ćirilović and Goran Mladenović, Gradbena Fakulteta Beograd (SRB): Performance of asphalt mixtures with increased content of recycled asphalt material

Mag Lidija K. Zagorc and Mag. Jožica Cezar, STIA NGI (SLO): Evaluation of alternative pavement rehabilitation according to the concept of sustainable development

Mag. Mitja Jurgele, DRI (SLO): Life cycle cost analyses of typical pavement structures in Slovenia with the consideration of environmental impacts



5.1 Technical presentation of Companies and Their Products; Mr. Willenpart

 Presenters: Petrol, HeystabLintecGenan RoadViatop Regio


5.2 Exhibitors


6. ROUND TABLE (Moderator: Jože Bonča)

Participants: Mag. Vrčko, Mag. Košič, Prof. Dr. Damijan 

In the organization of colloquium there is also the constant theme of transport infrastructure development. The round table participants informed attendants about the National Infrastructure Programme, which must be prepared and accepted in the year 2014. This will be the programme that will finally bring to the common denominator all transport sectors such as railways, state roads and motorways, marine and air transport and public transport, regarding the necessary investments. The funding is of course very limited, but it was a unanimous opinion of the participants of roundtable that without investments there will be no economic growth, because investments in infrastructure bring the country 2.5 to 3.0 times the repayment of invested funds. In addition to this, it was pointed out that we must not forget the maintenance of transport infrastructure and that must be a priority.

Summary of the round table is presented in the article in the newspaper "Delo"



Prof. Dr. Maja Makovec Brenčič: Marketing in civil engineering: where we are and where are we headed...? 

The colloquium is in addition to the core asphalt content always addressing also the wider issue. This year has been dedicated to marketing in the construction industry, since the collapse of many local construction companies is calling to a different, more sustainable approach. As Egbert Beuving, director of EAPA, as Professor Maja Makovec Brenčič, President of the Europe's largest academic organization in the field of marketing have given us great instructions on how to present and develop our business. They specifically pointed out the great work we perform; we build the roads that connect people, enable safe, comfortable and high level of service transportation and are environmentally friendly. Maja Makovec Brenčič finished her lecture by saying: "Asphalt people, tell us what you are doing and why your work is so important," which inspired participants of the colloquium.



 Slovenko Henigman, President of ZAS (Presentation)

On behalf of the organizer of the Slovenian Asphalt Pavement Association a warm welcome was expressed to all 167 participants. Mr. Henigman particularly welcomed the distinguished guests and many of participants from ten European countries and Slovenia.

The optimistic speech with presentation also showed the reality, in which Slovenian civil engineering is right now, achieving only 50% of turnover comparing to the year 2010. It is very similar to the situation in the Slovenian asphalt pavement business, where in 2012 there was only 1.1 million tons of asphalt mixtures produced, which is less than 60% of the long-term average. Stated above is very alarming as our roads, especially motorways, are despite a slight decrease in traffic, still overloaded above average. On 750 km long motorway network, the average daily traffic is of about 40,000 vehicles, trucks share exceeds 20%. On the other hand, we have 6,000 km of national roads with as much as 60 % in poor condition. All this calls for to take measures that will prevent further economic damage. Timely actions on pavements are always rational, but if late, they are costly and uneconomical. Often the consequences cannot be expressed in monetary ways, as they are reflected in the poor road safety, accidents and injuries, which unfortunately often end up tragically.

Mr. Henigman particularly emphasized themes highlighted on the 14th CAB and which are at this moment in asphalt pavement industry most up to date, including: the problem of raw basic materials (bitumen and aggregates), the optimum asphalt technology for reducing the negative environmental impacts such as low temperature asphalts, low noise asphalts, cold or hot recycled asphalt, asphalt with additives (slag, rubber, ...) and finally the pavement structure, which take into account all of the above. Exceptional speakers from eight European countries from different perspectives shed the light on the issue and show some views of the operation of asphalt branch in the future.

The collapse of large companies in Slovenia caused that medium-sized enterprises have become our large companies. Some small are growing and becoming medium-sized. Do the owners of these companies realize that with the new role that they are accepting, their responsibility also increases? The work that we do is challenging, interdisciplinary and requires a lot of knowledge and organizational skills. Mistake or set of mistakes on the road is always punishable, damage may already occur within the warranty period and the implications for companies can be fatal. We have enough knowledge in institutes, engineering companies, on the market there are a lot of good engineers, so it is necessary to apply this knowledge and be proactive to avoid possible errors and the deterioration of the reputation of companies and activities.

“We can achieve many things, which we have proven in the past, ultimately there are a few companies that we look up to, companies that even in these difficult times, expand and improve the business."

Thanks to all who contributed to the successful execution of the colloquium followed, the President of the Asphalt Pavement Association especially thanked the energy company Petrol, without which it would be impossible to make such high quality event.


Mag. Tomaž Berločnik, CEO PETROL

Petrol accompanies the colloquium as the main sponsor since the very beginning. Recognising the importance of asphalt and asphalt industry in connection with the knowledge and the exchange of energy, they are looking forward to any further cooperation and integration among all players. For the first time Petrol has presented itself in the part of Technical presentations of Companies and their products and thus intensified the cooperation with asphalt pavement branch. They will continue to do so and try to even upgrade what they have already achieved.


 Mag. Bojan Babič, Secretary of State MzIP

The State Secretary has in the name of the Ministry of Infrastructure and Spatial Planning expressed his satisfaction with the largest meeting in the field of transport infrastructure for the year 2014 in Slovenia. Such events reinforce knowledge, connect us and represent the general professional development. The Ministry therefore gives the meeting all the necessary support and would like to see that the results are successfully put into practice.


9. ACKNOWLEDGED on 14th CAB for their contribution to the development of the asphalt pavement profession in Slovenia

 Mag. Jožica Cezar, Mr. Aleksander Ljubič, Mr. Gerhard Dohr



Integration and cultural programe: Mrs. Manca Špik


 Hotel Golf, Bled, Slovenia, 28th and 29th of November 2013


Conclusions of the 14th Colloquium on Asphalt and Bitumen

Asphalt is a construction product that can be fully re-used in the new asphalt (100 % recycled) and also the residual energy value can be utilized.Due to the limited resources of raw materials (natural aggregates, bitumen) with various production and laying techniques the reuse of asphalt and the use of alternative materials (such as. black slag, rubber, ...) are encouraged. All of the above apply only when at least equal quality of the product is guaranteed and when there is no additional environmental impact.

The bitumen quality - as the key input material for the optimal quality of the asphalt - decreases. It is therefore necessary to influence the improvement of regulations/standards internationally and on the domestic market to find opportunities to widen today's minimal amount of tests both on the number of different test methods as well as on the frequency of quality control. It is necessary to take into account the experience and results of the old methods of tests and quickly introduce modern, performance related tests.

Low temperature asphalt is becoming a reality in our practice. After a period of testing and the use of different methods of lowering the temperature of the asphalt production, the market established a method of lowering the temperature with foamed bitumen (the additive is water). The main manufacturers of equipment for the production of asphalt have developed procedures and equipment, which is built in in asphalt plants as standard. It is expected an increase in production of low temperature asphalt, mainly due to comprehensive benefits that this technology provides, i.e. healthier environment for workers in the asphalt industry, the reduction of greenhouse gas emissions and the reduction in energy consumption. The latter consistently applying this technology also means a reduction of total cost of production. In some countries (USA, Norway, France, ...) a systematic approach to the use of low-temperature asphalt is adopted, so that this asphalt takes a significant percentage in the total production of asphalt mixtures. The primary purpose of promoting this technology in Norway is the contribution to the health of workers, and the State on the basis of an agreement with the trade unions and the state administration for each ton of this product contributes 4 Euros.

Asphalt with rubber is a technology by which the recycled rubber from old tires is used in asphalt mixtures. The most widely used is the so-called wet process, after which the recycled rubber granules in a 20% share are mixed in bitumen. This binder is a competitive product to polymer modified bitumen, because the modification with rubber granulate offers a wide range of temperature resistance of asphalt mixtures. Use of rubber contributes to resistance to dynamic loading and to adhesion. Experience from neighbouring countries Italy, Austria and Germany, which have also been confirmed in a test field on the motorway Divača - Kozina in 2013, are positive, although all of the answers to our questions are not yet known. Environmental effects are still not fully known, also the equivalent bearing capacity of the product in smaller embedded layer thickness is questionable. But the contribution of this asphalt in reducing the noise is undisputed. Since noise is one of the biggest environmental problems in connection with the traffic, the development of this technology is expected mainly in this direction. 

It is necessary to approximate the design and construction of asphalt pavements to Guidelines to sustainable construction. It is necessary to take into account all aspects of sustainable development (LCCA, assessment of environmental impacts, etc.). It is proposed to produce the adequate technical guideline, which will be the foundation for the introduction of optimal processes and materials in practice. It is also necessary to redefine the design period in new construction and rehabilitation to enable the competitiveness of the entire spectrum of existing technologies. Cited knowledge and technical guidelines should be introduced in legislation on green public procurement and thus new standards and implementation of new practices in the field of design, construction and maintenance of roads in particular, should be set.

In connection with the sustainable development of the asphalt industry in Slovenia is also a maintenance system of state roads. Annual cuts in funding for maintenance are directly reflected in the condition of the roads. In 2013 we are approaching the assessment that over 60% of national roads are in poor and very poor condition with extremely negative trend. In the period 1995 - 2010 we have built a motorway system that works. Its traffic (AADT of 40,000 vehicles), and traffic loads (an average of about 8,000 trucks per day) on the network, on average, have two, three or four times exceeded the predictions from the time of planning. Although the traffic is reducing, the traffic load is still at a very high level. It is therefore essential to ensure the reinforcements of motorway pavement structures on time. When deep deformations occur, which is already happening on some sections, the cost of rehabilitation increases several times. Because of that we cannot understand the drastic reduction in funding for the maintenance of national road network and lack of investment in motorways.

In addition to road infrastructure for the long-term sustainability in the transport sector it is necessarily to systematically regulate all other transport sectors as well. The Programme of development of transport infrastructure until 2020 (2030), which is currently being prepared on MzIP in collaboration with a number of contractors, should bring all transport sectors to the common denominator and give - with the operational investment plan until 2020 - guidelines for future development in the field of transportation. Beside that the Programme of development, which must be prepared and adopted in 2014, will pay particular attention to the maintenance of existing infrastructure, which has – even more in difficult economic conditions - get special significance. Every investment in infrastructure multiplies by a factor of 2.5 to 3, which has repeatedly been proven and which also admits the European Union. The construction industry in Slovenia strives for sustainable planning with even yearly investments, which will allow adjustment, operation and development.

For the future of asphalt and asphalt industry it is very important to have a positive opinion of the general public and the positive image of the profession among people. This is a positive only if we succeed in improving public understanding of the actual situation in our industry. We emphasize too little or not at all the positive aspects and effects that asphalt pavements bring. We must realize that asphalt as the most used material in an urban environment, facilitates communication between people, less dust, smooth running, lower fuel consumption, noise reductions, etc.. It is essential that the communication and exchange of information takes place at all levels and among all stakeholders. Asphalt roads are built in order to serve users and therefore we want to make the public well informed and aware that the asphalt continues to be the optimal choice for today and tomorrow.

Slovenian Asphalt Pavement Association
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