Journal: RILEM Bookseries

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Springer

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2211-0844
2211-0852

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2013 - 2019172020 - 202645
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Publications1 - 10 of 62
  • On the Carbonation Dilemma and How to Escape from It
    Item type: Conference Paper
    Angst, Ueli (2023)
    RILEM Bookseries ~ International RILEM Conference on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures. SynerCrete 2023 - Volume 2
    There is a dilemma between designing cementitious binders with low greenhouse gas (GHG) emissions and at the same time attempting to satisfy carbonation test requirements. In fact, various studies have shown that with increasing clinker replacement, the carbonation rate increases. The established paradigm to ensure durability, particularly to avoid reinforcement corrosion related damage, is based on avoiding carbonation of the concrete, as carbonation is conceptually equated with corrosion. This view presents a major goal conflict, and has important consequences for the ambition to reduce GHG emissions from the cement and concrete industry. The requirement to avoid carbonation penalizes binders with high clinker replacements in comparison with Portland cement. To overcome this barrier and to unleash the full potential of low carbon binders, there is thus an urgent need to escape from this “carbonation dilemma”. This conference contribution discusses how new insight with regard to the mechanism of corrosion of steel in concrete presents an opportunity to resolve the mentioned dilemma. There is increasing evidence that the moisture at the steel surface is the more important factor to ensure durability than whether or not the concrete carbonates. This way of looking at durability is underpinned by the findings of a working group within RILEM TC 281-CCC as well as recent scientific laboratory studies. A review of this literature is presented and a vision of a possible escape route from the “carbonation dilemma” is sketched.
  • Experimental analysis on the structural behaviour of connections with LVL made of beech wood
    Item type: Conference Paper
    Kobel, Peter; Steiger, René; Frangi, Andrea (2014)
    RILEM Bookseries ~ Materials and Joints in Timber Structures: Recent Developments of Technology
  • Adapting Smart Dynamic Casting to Thin Folded Geometries
    Item type: Conference Paper
    Szabo, Anna; Reiter, Lex; Lloret-Fritschi, Ena; et al. (2018)
    RILEM Bookseries ~ First RILEM International Conference on Concrete and Digital Fabrication – Digital Concrete 2018
  • Fully threaded self-tapping screws subjected to combined axial and lateral loading with different load to grain angles
    Item type: Conference Paper
    Jockwer, Robert; Steiger, René; Frangi, Andrea (2014)
    RILEM Bookseries ~ Materials and Joints in Timber Structures: Recent Developments of Technology
  • Durability of 3D Printed Concrete: Performance Assessment of a Two-Component System Against Water Absorption, Carbonation, and Chloride Ingress
    Item type: Conference Paper
    Lima, Lucas; Wangler, Timothy; Sanchez, Asel Maria; et al. (2024)
    RILEM Bookseries ~ Fourth RILEM International Conference on Concrete and Digital Fabrication
    Extrusion-based 3D-printing techniques with concrete have been studied for two decades and gained a lot of interest from both academia and industry. To produce mixtures capable of promoting fast hardening after extrusion, new approaches such as the use of accelerated blends have been recently developed. Two-component systems (2K), designed by partially replacing ordinary Portland cement with a fast-setting constituent - such as the combination of calcium-aluminate cement with anhydrite (CAC + CS) - were proven efficient for printing processes. However, there is a lack of literature regarding the durability of such mixtures, despite the increased interest in assembling structures with that process. This paper reports on the performance of 3D concrete printing, produced with a two-component system accelerated with CAC and CS, when submitted to water absorption, carbonation, and chloride ingress tests. The performance of printed and cast samples is compared, and the results are discussed. The findings of this study underline the main challenges to improve the performance of 3D printed concrete produced with two-component systems and fill an important gap of knowledge in the current literature.
  • Integrating Moisture Dynamics into Architectural Design Workflows: A grasshopper plugin to grasp the benefits of moisture buffering materials
    Item type: Conference Paper
    Posani, Magda; Priore, Yasmine; Sarangi, Ganeshalingam; et al. (2025)
    RILEM Bookseries ~ Proceedings of the RILEM Spring Convention and Conference 2024. Volume 1
    Low-carbon building materials, such as earth- and bio-based ones, have an excellent capacity to regulate indoor moisture levels. Thanks to their hygroscopic nature, they can buffer moisture from the indoor environment, absorbing it when humidity increases and releasing it when the air becomes drier. This moisture-buffering capacity can significantly improve indoor comfort and well-being. However, the extent of this benefit depends on factors like building usage, occupancy, ventilation rates, and external climate conditions. Thus, dynamic numerical simulations are often necessary to quantify the materials' benefits considering specific building scenarios. This paper investigates incorporating moisture dynamics evaluation into early architectural design workflows using the Grasshopper interface of Rhinoceros. This integration offers an advancement beyond conventional building performance simulations provided by current Grasshopper plugins. The paper explores the effectiveness of the newly developed WaterSkater plugin in assessing the hygrometric benefits of using moisture-buffering materials in architecture. This study represents the first application of the plugin, with future studies planned to validate its accuracy and correctness. The plugin discussed in this study allows for integrating materials’ moisture buffering capacity into early-stage architectural design workflows. This step enables designers to strategically select materials that align not only with sustainability objectives and desired U-values but also understand their potential for indoor humidity regulation. The presented plugin enables the incorporation of low-carbon, moisture-buffering materials from the early stages of building design, allowing for a strategic use of their moisture-regulating potential to improve indoor comfort and reduce the need for ventilation and humidity-control mechanical systems.
  • Corrosion Challenges and Opportunities in Digital Fabrication of Reinforced Concrete
    Item type: Conference Paper
    Stefanoni, Matteo; Angst, Ueli; Elsener, Bernhard (2019)
    RILEM Bookseries ~ First RILEM International Conference on Concrete and Digital Fabrication – Digital Concrete 2018
  • Large-scale experimental investigation of sustainable, low-cost seismic isolators based on rolling rubber spheres
    Item type: Conference Paper
    Katsamakas, Antonios; Vassiliou, Michalis F. (2024)
    RILEM Bookseries ~ 13th International Conference on Structural Analysis of Historical Constructions
    This study presents the results of a large-scale experimental investigation of sustainable and low-cost seismic isolators based on deformable rubber spheres rolling on concrete surfaces. A potential application of the isolators could be in low-rise masonry structures in the developing world. Parameters of investigation were the type of rolling spheres, the geometry of the concrete surfaces, and the weight that each isolator supports. Initially, the compressive response of the isolators was examined. Subsequently, lateral cyclic tests were performed. Finally, 1170 shake-table tests were performed in 1:2 scale, with various different isolators subjected to a large number of ground motion excitations. Results showed that the compressive strength of the spheres was substantially higher than the design load. The non-negligible deformability of the spheres leads to a lateral cyclic response that is different from the one of a rigid body model. The rolling friction coefficient ranged between 3.7% and 7.1%. During the shake table tests, the isolators reduced the acceleration transmitted to the superstructure (to 0.15 g) while maintaining reasonable peak and zero residual dis-placements. The shake table tests were repeatable, and the isolators did not deteriorate even after subjected to 65 ground motion excitations.
  • Time Reverse Modeling Versus Automatic Onset Detection
    Item type: Conference Paper
    Kocur, Georg K.; Saenger, Erik H.; Vogel, Thomas (2013)
    RILEM Bookseries ~ Nondestructive testing of materials and structures : proceedings of NDTMS-2011, Istanbul, Turkey, May 15-18, 2011
  • Challenges for Bio-Stabilised Earth-Based Construction
    Item type: Conference Paper
    Perlot, Céline; Bruno, Agostino Walter; Posani, Magda; et al. (2024)
    RILEM Bookseries ~ Second RILEM International Conference on Earthen Construction. ICEC 2024
    The RILEM technical committee TC BEC is considering the development of alternative stabilisation methods for earthen materials based on natural stabilisers with low environmental impact. An in-depth review of the state of the art has been carried out to identify the advances made and the main challenges to be addressed to democratise this practice. It appears that a rigorous classification of methods needs to be drawn up to support the draft of guidelines, among other things. The effects on mechanical and hygrothermal performance are beginning to be studied, but to better describe the mechanisms and guide the choice of methods, a link between the effects on the microstructural scale and performance needs to be established. This requires new experimental protocols adapted to bio-stabilised clayey matrices. The development of a performance-based approach is presented to take into account the environment in which the structural component is used. Finally, elements are presented for assessing climate change adaptation.
Publications1 - 10 of 62