TY - CONF A1 - Ramge, Peter A1 - Kühne, Hans-Carsten A1 - Ünal, Murat ED - Raupach, M. T1 - Modulare Ersatzmassen zur Reprofilierung denkmalgeschützter Natursteinbauwerke T2 - 3. Kolloquium Erhaltung von Bauwerken N2 - Weltweit besteht einen hoher, stetig wachsender Bedarf an Natursteininstandsetzung im Bereich des denkmalgeschützten Kulturguts. Das Ausbessem beschädigter Elemente mit sogenannten Steinersatzmassen ist dabei eine etablierte Technik. Hierfür werden Mörtel unterschiedlichster Zusammensetzung verwendet. Die Schwierigkeit für den Restaurator liegt in der Wahl, bzw. der Verfügbarkeit des optimalen Produkts, um im individuellen Fall sowohl den mechanischen und bauphysikalischen Anforderungen als auch den gestalterischen und denkmalpflegerischen Belangen gerecht zu werden. Anhand der im Beitrag an Fallbeispielen erläuterten häufig auftretenden Probleme und der daraus abgeleiteten Anforderungen an Natursteininstandsetzung, lässt sich die Komplexität dieser Aufgabe erkennen. An der BAM wird derzeit im Rahmen eines Forschungsprojekts ein modulares Steinersatzsystem entwickelt. Ziel der Entwicklung ist es dem Restaurator die größtmögliche Freiheit in der Anpassung des Mörtels an die Originalsubstanz zu geben. Erste Ergebnisse aus Parameterstudien zur Bindemittel- und Sandvariation sowie zu Polymermodifikationen werden vorgestellt. T2 - 3. Kolloquium Erhaltung von Bauwerken CY - Ostfildern, Germany DA - 22.01.2013 PY - 2013 SN - 978-3-943563-03-0 SP - 333 EP - 349 CY - Ostfildern AN - OPUS4-28000 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Ramge, Peter A1 - Ünal, Murat A1 - Kühne, Hans-Carsten ED - Uzoegbo, H.C. ED - Schmidt, Wolfram T1 - Modular repair mortars for natural stone in cultural heritage T2 - ACCTA - International conference on advances in cement and concrete technology in Africa 2013 (Proceedings) N2 - For the protection of the world’s cultural heritage the restoration of listed buildings and monuments is an important task. In many cases the need to repair and reprofile natural stone elements occurs. Repair mortars for such applications have to match historico-cultural interests as well as durability related and constructive interests. Currently a research project dealing with the development and optimisation of such mortars is set up at the German Federal Institute of Materials Research and Testing (BAM). To provide the conservatorwith the best possible options to match the colour, texture and technical requirements of the stone, the repair mortar System will be setup on a modular basis. Different binder Systems are planned to be combined with different aggregate compositions and different pigments. By the modular setup the possibility of independent adjustment of mechanical properties and appearance is aimed. In order to guaranty the reversibility and to ensure that the repair mortar does not induce any damage to the original substance, strength and stiffness of the repair mortar have to be well controlled. The use of polymer dispersions is helpful here, as they allow the production of low stiffness mortars with at the same time relatively high flexural strength values. Also investigations on “alternative” modifications known from historical applications such as the use of casein are carried out. Despite the urgency of seemingly more important building tasks, there is also a great demand for natural stone repair in cultural heritage on the African continent. There is a wide ränge of different objects reaching from prehistoric monuments up to colonial architecture, all in different säte of preservations and subjected to a variety of individual environmental ant climatic conditions, which demand individual and adjustable restoration techniques and materials. T2 - ACCTA - International conference on advances in cement and concrete technology in Africa 2013 CY - Johannesburg, South Africa DA - 28.01.2013 KW - Repair mortar KW - Natural stone KW - Cultural heritage KW - Polymer cement mortar (PCC) KW - Stone restoration KW - Stone reprofiling PY - 2013 SN - 978-3-9815360-3-4 SP - 1089 EP - 1098 AN - OPUS4-27768 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Ramge, Peter A1 - Schmidt, Wolfram A1 - Kühne, Hans-Carsten ED - Uzoegbo, H.C. ED - Schmidt, Wolfram T1 - Effect of the storage of cement on early properties of cementitious systems T2 - ACCTA - International conference on advances in cement and concrete technology in Africa 2013 (Proceedings) N2 - As soon as cement is mixed with water, the hydration reaction starts to set of. The progression of the hydration process is governed by the amount and the availability of water and its possibility to access the unhydrated cement grain surfaces. For a total hydration cement theoretically requires water amounting approximately 0.38 of its own mass. Nevertheless, due to the cement’s highly hygroscopic nature, already the moisture in the ambient air can cause first hydration reactions to set in upon the cement grain surfaces. Such pre-hydration processes have an effect on the cement's properties. Dpending on the specific conditions during the storage the significance of the impact on certain properties can vary. If cement is consumed soon after production and is transported only short distances in a silo wagon to its final destination for immediate use without further stock transfer, the effects are rather negligible. However, if cement is delivered in bags, transported over long distances, shifted serval times and stored for longer time periods until it is finally consumend, these effects can be quite severe. Due to the actual logistical situation with comparably few cement plants, large delivery distances and partially less developed infrastructures, the latter scenario pictures the situation for the most cases in Africa quite well. In order to verify the relevance of the pre-hydation for practical application, a series of tests was conducted at the German Federal Institute for Materials Research and Testing (BAM). The influence of the cement storage on gresh and hardened concrete properties was investigated for different concrete and mortar types. The investigations show that the impact of the storage conditions is more pronounced for specialized concretes with high sophisticated optimized mixture compositions containing admixtures. Nevertheless, the effects also occur for ordinary concrete and should not be ignored. T2 - ACCTA - International conference on advances in cement and concrete technology in Africa 2013 CY - Johannesburg, South Africa DA - 28.01.2013 KW - Cement KW - Storage KW - Ambient conditions KW - Hydration KW - Pre-hydration KW - Atmospheric humidity PY - 2013 SN - 978-3-9815360-3-4 SP - 339 EP - 347 AN - OPUS4-27757 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Ramge, Peter A1 - Kühne, Hans-Carsten A1 - Meng, Birgit ED - Grantham, M. ED - Mechtcherine, V. ED - Schneck, U. T1 - Influence of selected aspects of the mixture proportioning on the performance of repair mortars T2 - Concrete solutions 2011 - 4th International conference on concrete repair (Proceedings) T2 - Concrete solutions 2011 - 4th International conference on concrete repair CY - Dresden, Germany DA - 2011-09-26 KW - Repair mortar KW - Concrete rehabilitation KW - Repair systems KW - Polymer cement concrete (PCC) KW - Sprayed polymer cement concrete (SPCC) PY - 2012 SN - 978-0-415-61-622-5 SP - 451 EP - 459 PB - Taylor & Francis CY - London AN - OPUS4-24567 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Ramge, Peter ED - Kusterle, W. T1 - Entwicklung und Modifikation von PCC- und SPCC-Mörteln für die Betoninstandsetzung T2 - Spritzbeton - Tagung 2012 T2 - Spritzbeton - Tagung 2012 CY - Alpbach, Tirol, Österreich DA - 2012-01-12 PY - 2012 SP - 1 EP - 18(?) AN - OPUS4-25389 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Ramge, Peter A1 - Kühne, Hans-Carsten T1 - Natursteinersatzmassen für denkmalgeschütztes Kulturgut T2 - XVI. Workshop über die CHarakterisierung von feinteiligen und porösen Festkörpern T2 - XVI. Workshop über die CHarakterisierung von feinteiligen und porösen Festkörpern CY - Bad Soden, Germany DA - 2012-11-13 PY - 2012 AN - OPUS4-27464 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Ramge, Peter A1 - Kühne, Hans-Carsten T1 - Untersuchungen zur Porenstruktur von Natursteinersatzmassen für Anwendungen im denkmalgeschützten Bereich T2 - XVI. Workshop über die Charakterisierung von feinteiligen und porösen Festkörpern T2 - XVI. Workshop über die Charakterisierung von feinteiligen und porösen Festkörpern CY - Bad Soden, Germany DA - 2012-11-13 PY - 2012 AN - OPUS4-27465 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Ramge, Peter A1 - Kühne, Hans-Carsten T1 - Rheologische Eigenschaften von Instandsetzungsmörteln und Steinersatzmassen - Messungen mit dem Würpelgerät / Rheological Properties of Repair Mortars - Measurements with the Wuerpel-Device T2 - 21. Workshop und Kolloquium "Rheologische Messungen an Baustoffen" T2 - 21. Workshop und Kolloquium "Rheologische Messungen an Baustoffen" CY - Regensburg, Germany DA - 2012-02-29 PY - 2012 AN - OPUS4-25941 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Ramge, Peter A1 - Kühne, Hans-Carsten A1 - Ünal, Murat T1 - Entwicklung modularer Steinersatzmassen für Instandsetzung und Reprofilierung von Naturstein im denkmalgeschützten Bereich T2 - 18. Ibausil - Internationale Baustofftagung T2 - 18. Ibausil - Internationale Baustofftagung CY - Weimar, Germany DA - 2012-09-12 KW - Instandsetzungsmörtel KW - Steinersatzmasse KW - Naturstein KW - Steininstandsetzung KW - Reprofilierung KW - Modulares System KW - Denkmalschutz PY - 2012 SN - 978-3-00-034075-8 VL - 2 IS - 3.07 SP - 2-1123 - 2-1130 AN - OPUS4-26548 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Ramge, Peter A1 - Kühne, Hans-Carsten ED - Alexander, M. G. ED - Beushausen, H.-D. ED - Dehn, F. ED - Moyo, P. T1 - Investigations on the performance of concrete repair mortars in composite specimen tests T2 - 3rd International conference on concrete repair, rehabilitation and retrofitting III T2 - 3rd International conference on concrete repair, rehabilitation and retrofitting III CY - Cape Town, South Africa DA - 2012-09-03 KW - Concrete repair KW - Repair mortar KW - Composite specimen KW - Shrinkage KW - Stiffness KW - Constraining forces KW - Constraining cracks PY - 2012 SN - 978-0-415-89952-9 IS - Theme 3 SP - 1046 EP - 1052 PB - CRC Press CY - London, UK AN - OPUS4-26505 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -