Page 27 - Demo

NEWSwww.cpi-worldwide.com CPI %u2013 Concrete Plant International %u2013 3 | 2025FURTHER INFORMATIONRILEM 14-20 Boulevard NewtonB%u00e2timent Bienvenue - Cit%u00e9 Descartes77420 Champs-sur-Marne, Francewww.rilem.netof the properties of hardening and hardened concrete. In particular, the quality of the interlayer bond in extrusion-based 3D printing is a key focus in this respect, as it depends on factors like time intervals between layers, evaporation rate, and rheological properties. The interface regions often have a higher porosity than the core material, leading to weaker, more anisotropic, and less homogenous printed concrete compared to cast concrete. For sustainable and reliable application of the 3D-printing technology in industrial applications, these variations must be accounted for in material testing, structural design, and durability considerations. The main objectives of TC 304-ADC are to gather and analyze data on the mechanical properties of 3D-printed concrete in both its hardening and hardened states %u2013 taking into account factors like strength, elasticity, creep, shrinkage, and anisotropy from layer interfaces %u2013 and to develop performance-based recommendations for material requirements, testing methods, reinforcement integration, and design principles to support reliable and standardized printed concrete construction. The expected outcomes include practical recommendations that facilitate the introduction of this new technology into the practice of construction and concrete production. Carbon dioxide uptake by concrete during and after service lifeCarbonation of concrete decreases the pH of the pore solution, which can potentially lead to the corrosion of reinforcing steel, which in many cases determines the lifetime of reinforced concrete structures. On a more positive note, however, carbonation of cementitious materials involves uptake of atmospheric CO2 in solid reaction products, which partly compensates for the CO2 released by the production of the cement used to produce concrete or mortar, a process also referred to as %u2018recarbonation%u2019. Thus, carbonation is a process which occupies a central position in determining the sustainability of cementitious materials.The recently established RILEM TC CUC aims to critically evaluate and compare existing assumptions related to carbonation in cementitious materials, focusing on two key parameters: the carbonation coefficient and the fraction of CaO that carbonates. It seeks to improve understanding of how CO2 concentration, cement or binder type, and concrete strength affect carbonation rates, especially with the emergence of new binder types. Additionally, the committee will analyze the composition and amount of carbonation products formed under various conditions to better quantify CO2 uptake and refine sustainability assessments.ConclusionRILEM is an institution that continues to shape the future of construction materials and technology. Through its long history, RILEM has fostered international cooperation, advanced scientific knowledge, and provided a platform for the development of innovative and sustainable building practices. With its focus on improving the quality, durability, and sustainability of construction materials, RILEM remains a key player in the global construction community, contributing to safer, more efficient, and environmentally friendly buildings and infrastructure. Further information on the technical committee work of RILEM, as well as information related to individual and corporate membership categories can be found at www.rilem.net. nRACCREDITATOINSERTI QUALITA%u2019EDILMATIC S.P.A. Pegognaga (MN) - Italia www.edilmatic.itEDILMATIC SOLUTIONSFOR PREFABRICATION MT BRACKET SUPPORT SYSTEMHORIZONTAL MOT BRACKETSMT BRACKETSANNIVERSARY