A5001152856- Concrete and Cement Materials Research
- Magnesium Oxide Properties and Applications
- Concrete Corrosion and Durability
- Recycling and utilization of industrial and municipal waste in materials production
- Innovative concrete reinforcement materials
- Concrete Properties and Behavior
- Building materials and conservation
- Advanced ceramic materials synthesis
- Corrosion Behavior and Inhibition
- Zeolite Catalysis and Synthesis
- Engineering and Material Science Research
- Fire effects on concrete materials
- Recycled Aggregate Concrete Performance
- Clay minerals and soil interactions
- CO2 Sequestration and Geologic Interactions
- Chemical Synthesis and Characterization
- Grouting, Rheology, and Soil Mechanics
- Smart Materials for Construction
- Microbial Applications in Construction Materials
- Innovations in Concrete and Construction Materials
- Additive Manufacturing and 3D Printing Technologies
- Membrane Separation and Gas Transport
- Nuclear materials and radiation effects
- Geophysical Methods and Applications
- Flame retardant materials and properties
Federal Institute For Materials Research and Testing
2015-2024
Helmholtz Association of German Research Centres
2023-2024
Technische Universität Berlin
2012-2014
Abstract Many standardised durability testing methods have been developed for Portland cement-based concretes, but require validation to determine whether they are also applicable alkali-activated materials. To address this question, RILEM TC 247-DTA ‘Durability Testing of Alkali-Activated Materials’ carried out round robin carbonation and chloride penetration test methods, applied five different concretes based on fly ash, blast furnace slag or metakaolin. The appeared overall demonstrate...
Abstract The aim of RILEM TC 247-DTA ‘Durability Testing Alkali-Activated Materials’ is to identify and validate methodologies for testing the durability alkali-activated concretes. To underpin work this committee, five concrete mixes were developed based on blast furnace slag, fly ash, flash-calcined metakaolin. concretes designed with different intended performance levels, aiming assess capability test methods discriminate between basis. A total fifteen laboratories worldwide participated...
The use of calcined clays as supplementary cementitious materials (SCMs) has been identified a viable option to decrease the CO2 emissions related cement production. However, while extensive data is available about kaolinitic in this context, other such illitic appear be under-studied. Therefore, present study, two were compared low-grade terms transformations calcination temperature range 650–900 °C, and performance blended pastes measured by strength evolution, heat release, hydrated phase...
In this study, a multi-proxy approach combining 29Si, 27Al and 1H MAS-NMR, FEG-EPMA, XANES at the Cu K-edge XRD analytics with hydrochemical tools such as ICP-OES analyses, oxygen-isotope signatures, thermodynamic modelling was applied to K-silicate-activated metakaolin specimens - without CuSO4·5H2O addition exposed sulfuric acid pH = 2 for 35 days. The results revealed multistage deterioration mechanism governed by (i) diffusion, (ii) leaching of K-A-S-H, (iii) microstructural damage...
The development of alkali-activated materials (AAMs) as an alternative to Portland cement (PC) has seen significant progress in the past decades. However, there still remains uncertainty regarding their long term performance when used steel-reinforced structures. durability AAMs such applications depends strongly on corrosion behaviour embedded steel reinforcement, and experimental data literature are limited some cases inconsistent. This letter elucidates role chemistry mechanisms governing...
Abstract The RILEM technical committee TC 247-DTA ‘Durability Testing of Alkali-Activated Materials’ conducted a round robin testing programme to determine the validity various durability methods, originally developed for Portland cement based-concretes, assessment alkali-activated concretes. outcomes tests evaluating sulfate resistance, alkali-silica reaction (ASR) and freeze–thaw resistance are presented in this contribution. Five different concretes, based on ground granulated blast...
The ability of cement to chemically bind CO2 in a carbonation reaction enables the material act as carbon sink, which could partly account for offsetting emissions associated with production. In response many open questions this context, RILEM Technical Committee CUC was created May 2024. focus TC will be facilitate discussions regarding current approaches estimate uptake by cementitious materials (concrete and other construction products) during after service life. This Opening Letter...
Abstract Slags from the nonferrous metals industry have great potential to be used as feedstocks for production of alkali‐activated materials. Until now, however, only very limited information has been available about structural characteristics these In work presented herein, synthetic slags in CaO–FeO x –SiO 2 system, representing typical compositions Fe‐rich slags, and inorganic polymers (IPs) produced by activation with alkali silicate solutions studied means X‐ray absorption near‐edge...
Abstract The current understanding of the carbonation and prediction rate alkali-activated concretes is complicated inter alia by wide range binder chemistries used testing conditions adopted. To overcome some limitations individual studies to identify general correlations between mix design parameters resistance, RILEM TC 281-CCC ‘Carbonation Concrete with Supplementary Cementitious Materials’ Working Group 6 compiled analysed data for mortars from literature. For comparison purposes,...
The influence of starting materials and synthesis route on the properties structure cementitious sodium aluminosilicate gels is not fully understood, partly due their amorphous nature fact that they often contain residual reactants, which can make results single-pulse NMR spectroscopy applied to these difficult interpret or ambiguous. To overcome some limitations, 29Si{27Al} TRAPDOR as well 27Al{29Si} 27Al{1H} REDOR were synthesized by one-part alkali-activation from three different silica...
Cementitious materials are frequently applied in environments which they exposed to acid attack, e.g., sewer systems, biogas plants, and agricultural/food-related industries. Alkali-activated (AAMs) have repeatedly been shown exhibit a remarkably high resistance against attack by organic inorganic acids and, thus, promising candidates for the construction repair of acid-exposed structures. However, reaction mechanisms processes affecting AAMs just recently begun be understood more detail....
Abstract Wesentlich für das Sicherheitsniveau und damit die nachhaltige Wettbewerbsfähigkeit des Technologiestandorts Deutschland ist der Brandschutz in Industrieanlagen, Gebäuden im Transportwesen. Der vorbeugende bauliche hat u. a. Ziel, Brand‐ Rauchausbreitung Brandfall eine gewisse Zeit zu behindern, erforderlichen Lösch‐ Rettungsarbeiten durchgeführt werden können. Dies geschieht durch Anforderungen an Feuerwiderstandsfähigkeit brandbeanspruchter Bauteile. Feuerwiderstand eines Bauteils...
The passive fire protection of steel structures and other load-bearing components will continue to gain importance in future years. In the present contribution, novel intumescent aluminosilicate (geopolymer-bound) composites are proposed as fire-protective coatings on steel. Steel plates coated with these materials were exposed standard temperature-time curve defined ISO 834 – 1:1999. partially foamed during curing expanded further thermal exposure, demonstrating their...