Alkali-Aggregate Reactions

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The alkaline reactivity of aggregates is defined as the susceptibility of aggregates to react with alkalis contained in concrete, which may result in a reduction in the durability of the concrete and, consequently, its destruction. However, certain environmental conditions are required for this reaction to occur, and any damage as a result may not appear until many years after the pavement has been in use.

In Poland, in the years 2016-2019, research work was carried out under the NCBiR RID programme entitled. "Technical guidelines for the classification of domestic aggregates and prevention of alkaline reaction in concrete used in road surfaces and road engineering structures" ASR RID. The scope of work included, among other things, testing various aggregates from all over Poland using various research methods that were new to Poland.

Based on the results of the work, new RID-37 guidelines were developed for implementation on contracts carried out by the GDDKiA. The first, relatively short experience in applying the new requirements and assessment methods raises some doubts and points to potential problems in the broad application of the new provision. Therefore, there is a need for an in-depth discussion of the available test results, the selected methodology and the criteria for assessing alkaline reactivity.

In Poland, there are also known damages of the past years in the form of premature degradation of concrete pavements in Germany and the Czech Republic caused, among others, by alkaline reaction. Therefore, it is worth taking a look at the experiences of these countries, the preventive measures implemented and the possible repair methods used.



10:00-10:05 Opening of the colloquium
Zbigniew Kotlarek, President of the Polish Road Congress PKD

10:05-10:10 Introduction to colloquium
Moderator: Prof. Stefan Góralczyk, independent expert of IMBiGS Institute of Mechanization of Construction and Rock Mining

10:10-10:30 Keynote speech: Alkali-aggregates reactions in concrete - what we know, what we do not yet know and where we are going (TBC), Prof. Børge Johannes Wigum, Expert and Chairman of the Technical Committee RILEM,TC-258-AAA, HeidelbergCement Northern Europe, Iceland/Norway

Session I - Foreign experience

10:30-10:45 Prevention of damaging ASR on concrete road pavements in Germany, Dipl.-Ing. Ingmar Borchers – VDZ Technology GmbH, Düsseldorf, Germany

10:45-11:00 Results of research work in the field of AAR - their implementation into technical regulations and practice in the Czech Republic, Dr. Josef Stryk, Dr. Jiří Grošek - Research Institute CDV Brno, Ing. Jiří Hlavatý, Ph.D. - Road and Motorway Directorate ŘSD, Czech Republic

11:00-11:15 Analysis of the causes of cracks in concrete pavement: the impact of fast-hardening cement or the result of an ASR reaction?, Prof. Vít Šmilauer, Technical University ČVUT, Prague, Czech Republic

11:15-11:30 Evaluation of alkali-aggregate reactivity and the latest research information on ongoing research program in the Switzerland, Dr. Andreas Leemann – EMPA Material Research Institute, Switzerland

11:30-12:00 Q&A

12:00-12:15 Break

Session II - National experiences

12:15-12:30 The issue of reactivity of domestic aggregates
Moderator: Prof. Stefan Góralczyk, indipendent expert of IMBiGS Institute of Mechanization of Construction and Rock Mining

12:30-12:45 New requirements on alkali-aggregate reactivity on contracts of Polish Road Administration GDDKiA, mgr inż. Leszek Bukowski,Department of Road Construction Technology, GDDKiA, Poland

12:45-13:00 Summary and comparison of basic implemented methods of laboratory evaluation of alkali-aggregate reactions in concrete (TBC), dr hab. Daria Jóźwiak-Niedźwiedzka, Institute of Fundamental Technical Problems Polish Academy of Science IPPT PAN

13:00-13:15 Criteria for the selection of the test methodology and the selection of the level of requirements for alkali-aggregates reactivity (TBC), Prof. Michał Glinicki, Institute of Fundamental Problems of IPPT PAN Technology

13:15-13:30 Results of alkaline reactivity studies of Polish aggregates. Summary and analysis of experiences (TBC), dr Grzegorz Adamski – Łukaszewicz-ICiMB Institute of Ceramics and Building Materials

13:30-13:45 Fine aggregates market – selected conditions in the context of the current requirements of alkali reactivity, Dr. Łukasz Machniak, expert of the Polish Association of Aggregates Producers PZPK

13:45-14:00 Experiences of cement concrete producers (TBC), Dr. Artur Golda, Betotech, Dąbrowa Górnicza, expert Association of Manufacturers of Commodity Concrete SPBT

14:00-14:15 Experiences of cement producers. Acceptable alkali content. Cements authorized for use, Prof. Jan Deja, Polish Cement, AGH Kraków, expert of the Association of Cement Manufacturers SPC

14:15-15:00 Discussion and summary (moderator)

Terms of participation:

To participate in the Forum, it is required to complete an online registration form and pay the participation fee to the Polish Road Congress’ bank account at Alior Bank S.A. no: PL58 2490 0005 0000 4600 9671 2068 no later than May 28, 2021. An individual link to the broadcast will be sent to the e-mail address provided in the application on the day preceding the event.

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