TY - CHAP A1 - Thiel, Charlotte A1 - Haynack, Alexander A1 - Geyer, Sebastian A1 - Gehlen, Christoph A1 - Braun, Alexander ED - Pereira, Eduardo B. ED - Barros, Joaquim A. O. ED - Figueiredo, Fabio P. T1 - CarboDB-Open Access Database for Concrete Carbonation T2 - Proceedings of the 3rd RILEM Spring Convention and Conference (RSCC 2020), Volume 1: Strategies for a Resilient Built Environment, March 9-14, 2020, Guimarães, Portugal N2 - Sustainable service life design of reinforced concrete structures relies on accurate input values. However, in the field of carbonation induced corrosion some input parameters and statistical distributions still need to be validated for worldwide climate conditions. Furthermore, many well-published literature data is not considered due to different storage conditions. At the suggestion of CEN/TC 104/SC1/WG1 the database “CarboDB” was created providing open access to extensive information on concrete carbonation under different storage conditions. The natural carbonation coefficient as well as the minimum concrete cover can be calculated for chosen situations. CarboDB provides reliable data on concrete carbonation in order to increase existing knowledge on concrete carbonation. The database is available online at http://carbodb.bgu.tum.de//. By registration further contribution is possible and appreciated. New insights can be gained by merging several sources. For natural carbonation, testing only up to 140 days underestimates the carbonation progress of concretes with limestone fillers and high amount of ground granulated blast furnace slag. KW - Carbonation KW - Service life design KW - Data management KW - Compliance testing KW - Supplementary cementicious materials Y1 - 2021 SN - 978-3-030-76547-7 U6 - https://doi.org/10.1007/978-3-030-76547-7_8 SP - 79 EP - 90 PB - Springer International Publishing CY - Cham ER - TY - CHAP A1 - Haynack, Alexander A1 - Schneider, Alexander A1 - Timothy, Jithender J. A1 - Kränkel, Thomas A1 - Gehlen, Christoph A1 - Thiel, Charlotte T1 - Effect of Chloride Concentration on the Freeze-Thaw Resistance of Concrete T2 - International RILEM Conference on Synergising expertise towards sustainability and robustness of CBMs and concrete structures, SynerCrete’23 - Volume 2 N2 - Performance test methods intend to provide a fast, accurate and precise determination of a particular building material property and thus determine the associated material performance. In concrete, various performance tests are used to classify existing or to approve new materials, to compare concrete compositions or to determine causes of damage in existing structures. The challenge of such test methods is to accelerate natural (very slow) mechanisms to determine the material performance precisely within a short time. However, the attack on the material must not be unrealistically intensive, but must represent reality, just in fast motion. The performance tests used to demonstrate the freeze-thaw resistance of concrete employ a 3% NaCl solution, with literature data ranging from 1% to 10% showing that low concentrations can result in higher surface scaling. In this paper, mortar and concrete specimens are tested at 0, 1, 3, 6, and 9% NaCl solution following the CDF procedure (DIN CEN/TS 12390-9:2017-05). The results are discussed against the background of the existing literature and show that the damage is critically dependent on the pore system and thus also on the effect of the micro-ice lens pump. With increasing freeze-thaw exposition, the pessimum in the external damage shifts towards a de-icing salt concentration of 6%. Furthermore, a novel test methodology based on 3D-laserscanning is presented to determine scaling accurately by eliminating side effects that are typically present in current standards. KW - Concrete KW - durability KW - freeze-thaw resistance KW - chloride concentration KW - 3D laser scanning Y1 - 2023 U6 - https://doi.org/10.1007/978-3-031-33187-9_83 SP - 911 EP - 921 PB - Springer CY - Cham ER -