TY - CONF A1 - Müller, Urs A1 - Kargol, Marta A1 - Gardei, André ED - Rogge, A. ED - Meng, B. T1 - Der Einfluss der Zementart auf die Leistungsfähigkeit von Hydrophobierungsmitteln T2 - 52. DAfStb-Forschungskolloquium CY - Berlin, Deutschland DA - 2011-11-07 PY - 2011 SN - 978-3-9814281-0-0 SP - 186 EP - 193 PB - BAM Bundesanstalt für Materialforschung und -prüfung CY - Berlin AN - OPUS4-25183 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kargol, Marta A1 - Müller, Urs A1 - Gardei, André T1 - Properties and performance of silane: blended cement systems N2 - The paper presents the results of a study dealing with the performance of water repellents on hardened blended cement pastes. Since on the European market Portland cement does not play the dominant role anymore and due to the new national and European policies concerning Greenhouse Gases and sustainability, cement manufacturers produce more and more blended cements (CEM II–CEM V). Nevertheless, the majority of experience concerning the efficacy of water repellents is gained from Portland cement; therefore knowledge in regard to the interactions of blended cement with water repellent agent is minimal. Two silane-based products were applied on 'fresh' and carbonated cement substrates containing limestone, fly ash, slag and trass, and were investigated in terms of their functionality. The evaluation of the treatments' performance and effectiveness were assessed using various laboratory measurements. Hydrophobicity, water absorption, colour changes and the penetration depth of silanes into the substrate were evaluated before and after artificial aging experiments. Moreover, the outdoor weathering test was performed to shed light on treated surface appearance in a 'real' outdoor environment. The results showed that surface wettability was independent on water ingress or colour variations, especially for cement specimens artificially aged by accelerated carbonation. Cement pastes containing slag and trass seemed to more distinctly affect the water repellents' surface performance. KW - Water repellents KW - Silanes KW - Impregnation KW - Aging KW - Carbonation KW - Durability KW - Blended cement KW - Fly ash KW - Hydrophobicity KW - Hydrophobic agent PY - 2013 DO - https://doi.org/10.1617/s11527-012-9984-1 SN - 1359-5997 SN - 1871-6873 VL - 46 IS - 9 SP - 1429 EP - 1439 PB - Springer CY - Dordrecht AN - OPUS4-31839 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Kargol, Marta A1 - Müller, Urs A1 - Gardei, André A1 - Meng, Birgit T1 - Influence of blended cements on the performance of water repellent agents N2 - Ingress of moisture and harmful ions (e.g. Chloride, sulfate) into cementitious materials is one of the major factors in defining their durability. Modifications of building materials by targeted deposition of surface functional agents that make the surface hydro- and/or oleophobic aim to minimize moisture and ion ingress, and thus extend Service life of the cement based structures. Water repellent and easy-to-clean coatings for inorganic Substrates have gained strong attention during the last few years and various formulations based on silicones or alkylpolysiloxanes have been developed. Cementitious building materials are highly complex Systems with many components and changing properties in the course of a building’s Service life. The interactions between the Chemical agents and the cement based materials depend on many factors. The Chemical properties of the material Substrate appear to be the most important but in the context of their influence on the functionality of silanes and/or siloxanes these characteristics have not been well understood yet. The aim of this study was to evaluate the effect of different blended cements on water repellent agents’ performance. Two organosilicon compounds were applied on fresh blended cements containing limestone (L), fly ash (F), slag (S) and trass (T), and investigated in terms of their functionality. The surface properties of functionalized blended cements were studied based on wettability, i.e. contact angle measurements, before and after exposure to artificial and natural weathering. The first results indicate that slag and trass more distinctly affect the water repellent Surface performance after aging. T2 - Hydrophobe VI - 6th International conference on water repellent treatment of building materials CY - Rome, Italy DA - 12.05.2011 KW - Hydrophobic surfaces KW - Wettability KW - Impregnation KW - Blended cement KW - Silanes PY - 2011 SN - 978-3-931681-99-9 SP - 23 EP - 32 PB - Aedificatio Publishers AN - OPUS4-23681 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -