Verringerung des Rissbildungspotentials von UHPC durch innere Nachbehandlung

• Applicant: Professor Dr.-Ing. Viktor Mechtcherine
• Subject Area: Construction Material Sciences, Chemistry, Building Physics
• Term: from 2007 to 2013
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 55805405

• Final Report Year: 2014

Final Report Abstract

Innere Nachbehandlung durch Verwendung superabsorbierender Polymere (SAP) und einer genau abgestimmten Menge Zusatzwasser setzt das Rissbildungspotential von UHPC deutlich herab. Die Hauptursache sind signifikant verringerte autogene Schwindverformungen, infolge derer sich nur erheblich geringere Zwangszugspannungen im Betoninneren aufbauen. Jedoch ist sehr genau auf eine passende SAP- und zugehörige Zusatzwassermenge zu achten, damit die mechanischen Kennwerte (Druck-, Biegezugfestigkeit) nicht beeinträchtigt werden. Überdosierung von SAP und Nachbehandlungswasser kann zu deutlichen Festigkeitseinbußen und sehr stark erhöhter Kapillarporosität in der UHPC-Matrix führen.

Publications

• Mitigation of volume changes of Ultra-High Performance Concrete (UHPC) by using Super Absorbent Polymers. In: Fehling, E.; Schmidt, M.; Stürwald, S. (Ed.): Ultra High Performance Concrete (UHPC). Proc. of 2nd International Symposium on Ultra High Performance Concrete. University of Kassel, Germany, March 5-7, 2008 (Structural Materials and Engineering Series, 10), pp. 425–432, kassel university press, Kassel, 2008
  Dudziak, Lukasz; Mechtcherine, Viktor
  
• Innere Nachbehandlung für Hochleistungsbetone. In: Stark, J. (Ed.): 17. Internationale Baustofftagung -Tagungsbericht. ibausil. Bauhaus Universität Weimar, September 23-26, 2009. 2 Bände, pp. 1-1053 - 1-1058, F.-A. Finger Institut für Baustoffkunde, Weimar, 2009
  Mechtcherine, Viktor; Dudziak, Lukasz
  
• Internal curing to reduce cracking potential of ultra-high-performance concrete by means of super absorbent polymers. In: Kovler, K. (Ed.): Proc. of the 2nd International RILEM Workshop on Concrete Durability and Service Life Planning. ConcreteLife'09. Haifa, Israel, September 7-9, 2009, pp. 31–38, RILEM Publications, Bagneux, France, 2009
  Mechtcherine, Viktor; Dudziak, Lukasz; Hempel, Simone
  
• Mitigating early age shrinkage of ultra-high performance concrete by using super absorbent polymers (SAP). In: Tanabe, T.-a. et al. (Ed.): Creep, Shrinkage and Durability Mechanics of Concrete and Concrete Structures. Proc. of CONCREEP 8. Ise-Shima, Japan, September 30 - October 2, 2008, pp. 847–853, CRC Press, 2009
  Mechtcherine, Viktor; Dudziak, Lukasz; Hempel, Simone
  
• Reducing the cracking potential of ultra-high performance concrete by using Super Absorbent Polymers (SAP). In: Zijl, Gideon P. A. G. van; Boshoff, W. P. (Ed.): Advances in cement-based materials. Proc. of the. International Conference on Advanced Concrete Materials. Stellenbosch, South Africa, November 17-19, 2009, pp. 11–19, CRC Press, Leiden, The Netherlands, 2009
  Dudziak, Lukasz; Mechtcherine, Viktor
  
• Assessing the autogenous shrinkage cracking propensity of concrete - methodological aspects. In: Jensen, O. M.; Hasholt, M. T.; Lausten S. (Ed.): Proc. of the International RILEM Conference on Use of Superabsorbent Polymers and Other New Additives in Concrete. Lyngby, Denmark, August 15-18, 2010 (RILEM proceedings, pr074), pp. 45–56, 2010
  Eppers, Sören; Mechtcherine, Viktor; Müller, Christoph
  
• Deliberations on kinetics of internal curing water migration and consumption based on experimental studies on SAP-enriched UHPC. In: Jensen, O. M.; Hasholt, M. T.; Lausten S. (Ed.): Proc. of the International RILEM Conference on Use of Superabsorbent Polymers and Other New Additives in Concrete. Lyngby, Denmark, August 15-18, 2010 (RILEM proceedings, pr074), pp. 33–43, 2010
  Dudziak, Lukasz; Mechtcherine, Viktor
  
• Effect of Composite and Curing on Microstructure of UHPC. In: The International Federation for Structural Concrete (fib) (Ed.): Proc. of the 3rd International fib Congress and Exhibition. Incorporating the PCI Annual Convention and Bridge Conference. Washington, D.C., 2010, proceedings disk ID130
  Möser, Bernd; Pfeifer, Claudia; Heinz, Detlef; Gerlicher, Tobias; Mechtcherine, Viktor; Dudziak, Lukasz
  
• Enhancing early-age resistance to cracking in high-strength cement-based materials by means of internal curing using super absorbent polymers. In: Brahmeshuber, W. (Ed.): International RILEM Conference on Material Science - AdIPoC - Additions Improving Properties of Concrete - Theme 3. Aachen, September 6-8, 2010 (RILEM proceedings, pro077), pp. 129–139, 2010
  Dudziak, Lukasz
  
• Investigations on the workability and microstructure development of UHPC - part 2: Influence of admixtures and curing on the microstructure of ultra-high strength concretes (Untersuchungen zur Verarbeitbarkeit und Gefügeentwicklung von UHPC - Teil 2: Einfluss von Zusatzstoffen und Nachbehandlung auf die Gefügestruktur ultrahochfester Betone). In: Cement International 8 (6), pp. 74–84, 2010
  Möser, Bernd; Pfeifer, Claudia; Heinz, Detlef; Gerlicher, Tobias; Mechtcherine, Viktor; Dudziak, Lukasz
  
• Time-Dependent Behaviour of Ultra High Performance Concrete (UHPC). In: The International Federation for Structural Concrete (fib) (Ed.): Proc. of the 3rd International fib Congress and Exhibition. Incorporating the PCI Annual Convention and Bridge Conference. Washington, D.C., 2010, proceedings disk ID178
  Müller, Harald S.; Burkart, Isabel; Budelmann, Harald; Ewert, Jens; Mechtcherine, Viktor; Dudziak, Lukasz et al.
  
• Superabsorbierende Polymere (SAP): Innovative multifunktionale Betonzusatzmittel. In: Beton (3), pp. 68–72, 2011
  Mechtcherine, Viktor; Dudziak, Lukasz; Brüdern, Arnd-Eike; Hempel, Simone; Schröfl
  
• Untersuchungen zum Wirkmechanismus superabsorbierender Polymere (SAP) als multifunktionale Betonzusatzmittel. In: Schmidt-Döhl, F.; Deckelmann, G. (Ed.): Tagung der GDCh-Fachgruppe Bauchemie. TU Hamburg-Harburg, 6./ 7. Oktober 2011 (Gesellschaft Deutscher Chemiker, GDCh-Monographie, Bd. 44), pp. 179–182, 2011
  Schröfl, Christof; Gorges, Michaela; Mechtcherine, Viktor
  
• (2012): Application of Super Absorbent Polymers (SAP) in Concrete Construction, Dordrecht, Springer Netherlands
  Mechtcherine, Viktor; Reinhardt, Hans-Wolf (Ed.)
  
• Effects of superabsorbent polymers on shrinkage of concrete: Plastic, autogenous, drying. In: Mechtcherine, V.; Reinhardt, H.-W. (Ed.): Application of Super Absorbent Polymers (SAP) in Concrete Construction, pp. 63–98, Springer Netherlands, Dordrecht, 2012
  Mechtcherine, Viktor; Dudziak, Lukasz
  
• Kinetik der Absorption und Desorption superabsorbierender Polymere (SAP) in Zementleim: Direkte Visualisierung mittels Neutronenradiographie. In: Winnefeld, F.; Descher, F. (Ed.): Tagung der GDCh-Fachgruppe Bauchemie. Dübendorf, Schweiz, 11./ 12. Oktober 2012 (Gesellschaft Deutscher Chemiker, GDCh-Monographie, Bd. 45), pp. 57–61, 2012
  Schröfl, Christof; Mechtcherine, Viktor
  
• Relation between the molecular structure and the efficiency of superabsorbent polymers (SAP) as concrete admixtures to mitigate autogenous shrinkage. In: Cement and Concrete Research 42 (6), pp. 865–873, 2012
  Schröfl, Christof; Mechtcherine, Viktor; Gorges, Michaela
  
• Superabsorbent polymers to mitigate autogenous shrinkage of cement mortar. In: ACI SP-188, Farmington Hills/MI, pp. 265–278, 2012
  Schröfl, Christof; Mechtcherine, Viktor
  
• Effect of internal curing by using superabsorbent polymers (SAP) on autogenous shrinkage and other properties of a high-performance fine-grained concrete – results of a RILEM round-robin test, TC 225-SAP. In: Materials and Structures, 2013
  Mechtcherine, Viktor; Gorges, Michaela; Schröfl, Christof; Assmann, Alexander; Brahmeshuber, Wolfgang; Bettencourt Ribeiro, A. et al.