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This work reports a detailed experimental study that is aimed at investigating the failure mechanisms of highly porous cementitious foams used as heat insulation under triaxial stress states. The designed target dry density of the considered foam mixture was 180 kg/m3 by setting the water-to-cement ratio of the considered cement paste to 0.4. The mechanical experiments were accompanied by thermal tests to observe the effect that specific air void structures have on the resulting insulation properties and by micro-to-meso geometric studies to identify and classify the inner structure of the considered mineralized foams. Unconfined compressive strengths were performed first, obtaining peak stresses of 0.252, 0.283, 0.223, and 0.251 (results in MPa), corresponding to peak strains of 39.0, 28.6, 45.3, and 20.6 (in ×10−3 mm/mm), respectively. Moreover, three triaxial confinement levels of 33%, 66%, and 90% of the mean uniaxial compressive strength (fc) were adopted. The results showed that a 33% confinement may cause a strength increase and an almost perfect elastic–plastic stress–strain behavior. However, higher levels of confinements (i.e., 66% and 90%) produced very unstable behaviors in terms of the final strength and stress–strain response.
Albrecht Gilka-Bötzow; Paula Folino; Andreas Maier; Eduardus Koenders; Antonio Caggiano. Triaxial Failure Behavior of Highly Porous Cementitious Foams Used as Heat Insulation. Processes 2021, 9, 1373 .
AMA StyleAlbrecht Gilka-Bötzow, Paula Folino, Andreas Maier, Eduardus Koenders, Antonio Caggiano. Triaxial Failure Behavior of Highly Porous Cementitious Foams Used as Heat Insulation. Processes. 2021; 9 (8):1373.
Chicago/Turabian StyleAlbrecht Gilka-Bötzow; Paula Folino; Andreas Maier; Eduardus Koenders; Antonio Caggiano. 2021. "Triaxial Failure Behavior of Highly Porous Cementitious Foams Used as Heat Insulation." Processes 9, no. 8: 1373.
This work reports the results of an extensive experimental campaign aimed at investigating the Thermal Energy Storage (TES) behavior of PCM Recycled Brick Aggregate (RBA) mortars. Test specimens for TES measurements were produced following a new spherical-shaped technique, patented as “DKK test” by the Institute of Construction and Building Materials of TU-Darmstadt. DKK was used for characterizing the various test samples made of plain cement paste plus porous RBAs, these latter filled with paraffinic PCM waxes. Dynamic DSC tests and conductivity measurements were also done for thermally investigating both components and composites. Moreover, the study proposes a novel numerical approach for determining the energy storage capacity of the investigated systems, setting the experimental benchmarks for validation. Particularly, the experimental results have been finally employed for calibrating an enthalpy-based model, at both macro- and meso-scale level, to evaluate the temperature-based thermal parameters like specific heat, conductivity, or more in a general sense, the energy storage capacity of these systems under transient heat conduction conditions. The results show very promising possibilities for using RBAs as carriers in green concrete applications.
Christoph Mankel; Antonio Caggiano; Andreas Koenig; Diego Said Schicchi; Mona Nazari Sam; Eddie Koenders. Green Cementitious Composites Made with PCM-Recycled Brick Aggregates: Thermal Energy Storage Characterization and Modelling. RILEM Bookseries 2021, 179 -190.
AMA StyleChristoph Mankel, Antonio Caggiano, Andreas Koenig, Diego Said Schicchi, Mona Nazari Sam, Eddie Koenders. Green Cementitious Composites Made with PCM-Recycled Brick Aggregates: Thermal Energy Storage Characterization and Modelling. RILEM Bookseries. 2021; ():179-190.
Chicago/Turabian StyleChristoph Mankel; Antonio Caggiano; Andreas Koenig; Diego Said Schicchi; Mona Nazari Sam; Eddie Koenders. 2021. "Green Cementitious Composites Made with PCM-Recycled Brick Aggregates: Thermal Energy Storage Characterization and Modelling." RILEM Bookseries , no. : 179-190.
Modelling of a mineral dissolution front propagation is of interest in a wide range of scientific and engineering fields. The dissolution of minerals often involves complex physico-chemical processes at the solid–liquid interface (at nano-scale), which at the micro-to-meso-scale can be simplified to the problem of continuously moving boundaries. In this work, we studied the diffusion-controlled congruent dissolution of minerals from a meso-scale phase transition perspective. The dynamic evolution of the solid–liquid interface, during the dissolution process, is numerically simulated by employing the Finite Element Method (FEM) and using the phase–field (PF) approach, the latter implemented in the open-source Multiphysics Object Oriented Simulation Environment (MOOSE). The parameterization of the PF numerical approach is discussed in detail and validated against the experimental results for a congruent dissolution case of NaCl (taken from literature) as well as on analytical models for simple geometries. In addition, the effect of the shape of a dissolving mineral particle was analysed, thus demonstrating that the PF approach is suitable for simulating the mesoscopic morphological evolution of arbitrary geometries. Finally, the comparison of the PF method with experimental results demonstrated the importance of the dissolution rate mechanisms, which can be controlled by the interface reaction rate or by the diffusive transport mechanism.
Sha Yang; Neven Ukrainczyk; Antonio Caggiano; Eddie Koenders. Numerical Phase-Field Model Validation for Dissolution of Minerals. Applied Sciences 2021, 11, 2464 .
AMA StyleSha Yang, Neven Ukrainczyk, Antonio Caggiano, Eddie Koenders. Numerical Phase-Field Model Validation for Dissolution of Minerals. Applied Sciences. 2021; 11 (6):2464.
Chicago/Turabian StyleSha Yang; Neven Ukrainczyk; Antonio Caggiano; Eddie Koenders. 2021. "Numerical Phase-Field Model Validation for Dissolution of Minerals." Applied Sciences 11, no. 6: 2464.
In this work, the Acoustic Emissions (AEs), detected in real-scale Reinforced Concrete (RC) beams which have been tested under four-point bending, are investigated and correlated with their structural responses and damage evolutions. Two different reinforcing bar arrangements, with or without shear stirrups, were designed in order to obtain bending or shear failure modes, respectively. Moreover, some of the beams were casted with the addition of steel fibers in the concrete mixture. A loading procedure characterized by several cycles of increasing amplitude up to failure was implemented. Beams failure behaviors and the aptitude of four AE-based indices to assess their damage level, are presented and compared. Moreover, some relevant variables possibly affecting the indices performance are analyzed. The steel fibers enhanced shear strength by restricting the development of inclined cracks in the beam without stirrups. Finally, it can be figured out that AE indices showed a quite good correlation with cracking initiation and progression. Therefore, they proved to be competent for both monitoring the RC beams loading response and detecting eventual local damages, even for fiber-reinforced concrete members.
Hernán Xargay; Marianela Ripani; Paula Folino; Nicolás Núñez; Antonio Caggiano. Acoustic emission and damage evolution in steel fiber-reinforced concrete beams under cyclic loading. Construction and Building Materials 2020, 274, 121831 .
AMA StyleHernán Xargay, Marianela Ripani, Paula Folino, Nicolás Núñez, Antonio Caggiano. Acoustic emission and damage evolution in steel fiber-reinforced concrete beams under cyclic loading. Construction and Building Materials. 2020; 274 ():121831.
Chicago/Turabian StyleHernán Xargay; Marianela Ripani; Paula Folino; Nicolás Núñez; Antonio Caggiano. 2020. "Acoustic emission and damage evolution in steel fiber-reinforced concrete beams under cyclic loading." Construction and Building Materials 274, no. : 121831.
Improving the durability and sustainability of concrete structures has been driving the enormous number of research papers on self-healing mechanisms that have been published in the past decades. The vast developments of computer science significantly contributed to this and enhanced the various possibilities numerical simulations can offer to predict the entire service life, with emphasis on crack development and cementitious self-healing. The aim of this paper is to review the currently available literature on numerical methods for cementitious self-healing and fracture development using Phase-Field (PF) methods. The PF method is a computational method that has been frequently used for modeling and predicting the evolution of meso- and microstructural morphology of cementitious materials. It uses a set of conservative and non-conservative field variables to describe the phase evolutions. Unlike traditional sharp interface models, these field variables are continuous in the interfacial region, which is typical for PF methods. The present study first summarizes the various principles of self-healing mechanisms for cementitious materials, followed by the application of PF methods for simulating microscopic phase transformations. Then, a review on the various PF approaches for precipitation reaction and fracture mechanisms is reported, where the final section addresses potential key issues that may be considered in future developments of self-healing models. This also includes unified, combined and coupled multi-field models, which allow a comprehensive simulation of self-healing processes in cementitious materials.
Sha Yang; Fadi Aldakheel; Antonio Caggiano; Peter Wriggers; Eddie Koenders. A Review on Cementitious Self-Healing and the Potential of Phase-Field Methods for Modeling Crack-Closing and Fracture Recovery. Materials 2020, 13, 5265 .
AMA StyleSha Yang, Fadi Aldakheel, Antonio Caggiano, Peter Wriggers, Eddie Koenders. A Review on Cementitious Self-Healing and the Potential of Phase-Field Methods for Modeling Crack-Closing and Fracture Recovery. Materials. 2020; 13 (22):5265.
Chicago/Turabian StyleSha Yang; Fadi Aldakheel; Antonio Caggiano; Peter Wriggers; Eddie Koenders. 2020. "A Review on Cementitious Self-Healing and the Potential of Phase-Field Methods for Modeling Crack-Closing and Fracture Recovery." Materials 13, no. 22: 5265.
High temperature effect on cement-based composites, such as concrete or mortars, represents one of the most important damaging process that may drastically affect the mechanical and durability characteristics of structures. In this paper, the results of an experimental campaign on cement mortars submitted to high temperatures are reported and discussed. Particularly, two mixtures (i.e., Normal (MNS) and High Strength Mortar (MHS)) having different water-to-binder ratios were designed and evaluated in order to investigate the incidence of both the mortar composition and the effects of thermal treatments on their physical and mechanical properties. Mortar specimens were thermally treated in an electrical furnace, being submitted to the action of temperatures ranging from 100 to 600 ∘C. After that and for each mortar quality and considered temperature, including the room temperature case of 20 ∘C, water absorption was measured by following a capillary water absorption test. Furthermore, uniaxial compression, splitting tensile and three-points bending tests were performed under residual conditions. A comparative analysis of the progressive damage caused by temperature on physical and mechanical properties of the considered mortars types is presented. On one hand, increasing temperatures produced increasing water absorption coefficients, evidencing the effect of thermal damages which may cause an increase in the mortars accessible porosity. However, under these circumstances, the internal porosity structure of lower w/b ratio mixtures results much more thermally-damaged than those of MNS. On the other hand, strengths suffered a progressive degradation due to temperature rises. While at low to medium temperatures, strength loss resulted similar for both mortar types, at higher temperature, MNS presented a relatively greater strength loss than that of MHS. The action of temperature also caused in all cases a decrease of Young’s Modulus and an increase in the strain corresponding to peak load. However, MHS showed a much more brittle behavior in comparison with that of MNS, for all temperature cases. Finally, the obtained results demonstrated that mortar quality cannot be neglected when the action of temperature is considered, being the final material performance dependent on the physical properties which, in turn, mainly depend on the mixture proportioning.
Marianela Ripani; Hernán Xargay; Ignacio Iriarte; Kevin Bernardo; Antonio Caggiano; Paula Folino. Thermal Action on Normal and High Strength Cement Mortars. Applied Sciences 2020, 10, 6455 .
AMA StyleMarianela Ripani, Hernán Xargay, Ignacio Iriarte, Kevin Bernardo, Antonio Caggiano, Paula Folino. Thermal Action on Normal and High Strength Cement Mortars. Applied Sciences. 2020; 10 (18):6455.
Chicago/Turabian StyleMarianela Ripani; Hernán Xargay; Ignacio Iriarte; Kevin Bernardo; Antonio Caggiano; Paula Folino. 2020. "Thermal Action on Normal and High Strength Cement Mortars." Applied Sciences 10, no. 18: 6455.
This study deals with the analytical modeling of hybrid fiber-reinforced concretes (HyFRCs) made with a blend of different types of fibers characterized by different geometries and/or constitutive materials. The presented analytical formulation is oriented towards predicting the postcracking behavior of HyFRC and is mainly based on the well-known “cracked-hinge” model originally employed for standard fiber-reinforced concrete beams. The proposed model is validated by considering the experimental results obtained in a previous study carried out on HyFRCs mixtures made with a blend of steel and polypropylene fibers. Theoretical results are presented to demonstrate the predictive capabilities of the model to simulate the observed experimental behavior. The model performance is in very good agreement with the experimental data. Therefore, it has the capability to forecast the postcracking behavior of a generic HyFRC of given fiber contents depending on the actual proportion of the fiber blend. Finally, the proposed formulation can be applied as a computational aid to the design of HyFRC mixtures for structural purposes.
Antonio Caggiano; Marco Pepe; Hernan Xargay; Enzo Martinelli. Analytical Modeling of the Postcracking Response Observed in Hybrid Steel/Polypropylene Fiber-Reinforced Concrete. Polymers 2020, 12, 1864 .
AMA StyleAntonio Caggiano, Marco Pepe, Hernan Xargay, Enzo Martinelli. Analytical Modeling of the Postcracking Response Observed in Hybrid Steel/Polypropylene Fiber-Reinforced Concrete. Polymers. 2020; 12 (9):1864.
Chicago/Turabian StyleAntonio Caggiano; Marco Pepe; Hernan Xargay; Enzo Martinelli. 2020. "Analytical Modeling of the Postcracking Response Observed in Hybrid Steel/Polypropylene Fiber-Reinforced Concrete." Polymers 12, no. 9: 1864.
This work proposes a numerical procedure to simulate and optimize the thermal response of a multilayered wallboard system for building envelopes, where each layer can be possibly made of Phase Change Materials (PCM)-based composites to take advantage of their Thermal-Energy Storage (TES) capacity. The simulation step consists in solving the transient heat conduction equation across the whole wallboard using the enthalpy-based finite element method. The weather is described in detail by the Typical Meteorological Year (TMY) of the building location. Taking the TMY as well as the wall azimuth as inputs, EnergyPlusTM is used to define the convective boundary conditions at the external surface of the wall. For each layer, the material is chosen from a predefined vade mecum, including several PCM-based composites developed at the Institut für Werkstoffe im Bauwesen of TU Darmstadt together with standard insulating materials (i.e., EPS or Rockwool). Finally, the optimization step consists in using genetic algorithms to determine the stacking sequence of materials across the wallboard to minimize the undesired heat loads. The current simulation-based optimization procedure is applied to the design of envelopes for minimal undesired heat losses and gains in two locations with considerably different weather conditions, viz. Sauce Viejo in Argentina and Frankfurt in Germany. In general, for each location and all the considered orientations (north, east, south and west), optimal results consist of EPS walls containing a thin layer made of the PCM-based composite with highest TES capacity, placed near the middle of the wall and closer to the internal surface.
Victor D. Fachinotti; Facundo Bre; Christoph Mankel; Eduardus A. B. Koenders; Antonio Caggiano. Optimization of Multilayered Walls for Building Envelopes Including PCM-Based Composites. Materials 2020, 13, 2787 .
AMA StyleVictor D. Fachinotti, Facundo Bre, Christoph Mankel, Eduardus A. B. Koenders, Antonio Caggiano. Optimization of Multilayered Walls for Building Envelopes Including PCM-Based Composites. Materials. 2020; 13 (12):2787.
Chicago/Turabian StyleVictor D. Fachinotti; Facundo Bre; Christoph Mankel; Eduardus A. B. Koenders; Antonio Caggiano. 2020. "Optimization of Multilayered Walls for Building Envelopes Including PCM-Based Composites." Materials 13, no. 12: 2787.
Thermal-Energy Storage (TES) properties of organic phase change materials have been experimentally investigated and reported in this paper. Three paraffin-based Phase Change Materials (PCMs) and one bio-based PCM are considered with melting temperatures of 24 °C, 25 °C and 26 °C. Sensible heat storage capacities, melting characteristics and latent heat enthalpies of the studied PCMs are investigated through Differential Scanning Calorimetry (DSC) measurements. Two alternative methods, namely the classical dynamic DSC and a stepwise approach, are performed and compared with the aim to eliminate and/or overcome possible measurement errors. In particular, for DSC measurements this could be related to the size of the samples and its representativity, heating rate effects and low thermal conductivity of the PCMs, which may affect the results and possibly cause a loss of objectivity of the measurements. Based on results achieved from this study, clear information can be figured out on how to conduct and characterize paraffin and bio-based PCMs, and how to apply them in TES calculations for building applications and/or simulations. It is observed that both paraffinic and bio-based PCMs possess a comparable TES capacity within the selected phase transition temperature, being representative for the human thermal comfort zone. The phase change of bio-based PCMs occurred over a much narrower temperature range when compared to the wider windows characterizing the paraffin-based materials. Bio-based PCMs turned out to be very suitable for building applications and can be an environmentally friendly substitute for petroleum-based PCMs.
Mona Nazari Sam; Antonio Caggiano; Christoph Mankel; Eddie Koenders. A Comparative Study on the Thermal Energy Storage Performance of Bio-Based and Paraffin-Based PCMs Using DSC Procedures. Materials 2020, 13, 1705 .
AMA StyleMona Nazari Sam, Antonio Caggiano, Christoph Mankel, Eddie Koenders. A Comparative Study on the Thermal Energy Storage Performance of Bio-Based and Paraffin-Based PCMs Using DSC Procedures. Materials. 2020; 13 (7):1705.
Chicago/Turabian StyleMona Nazari Sam; Antonio Caggiano; Christoph Mankel; Eddie Koenders. 2020. "A Comparative Study on the Thermal Energy Storage Performance of Bio-Based and Paraffin-Based PCMs Using DSC Procedures." Materials 13, no. 7: 1705.
This paper reports a numerical approach for modelling the thermal behavior and heat accumulation/liberation of sustainable cementitious composites made with Recycled Brick Aggregates (RBAs) employed as carriers for Phase-Change Materials (PCMs). In the framework of the further development of the fixed grid modelling method, classically employed for solving the well-known Stefan problem, an enthalpy-based approach and an apparent calorific capacity method have been proposed and validated. More specifically, the results of an experimental program, following an advanced incorporation and immobilization technique, developed at the Institut für Werkstoffe im Bauwesen for investigating the thermal responses of various combinations of PCM-RBAs, have been considered as the benchmark to calibrate/validate the numerical results. Promising numerical results have been obtained, and temperature simulations showed good agreement with the experimental data of the analyzed mixtures.
Christoph Mankel; Antonio Caggiano; Andreas König; Diego Said Said Schicchi; Mona Nazari Nazari Sam; Eddie Koenders. Modelling the Thermal Energy Storage of Cementitious Mortars Made with PCM-Recycled Brick Aggregates. Materials 2020, 13, 1064 .
AMA StyleChristoph Mankel, Antonio Caggiano, Andreas König, Diego Said Said Schicchi, Mona Nazari Nazari Sam, Eddie Koenders. Modelling the Thermal Energy Storage of Cementitious Mortars Made with PCM-Recycled Brick Aggregates. Materials. 2020; 13 (5):1064.
Chicago/Turabian StyleChristoph Mankel; Antonio Caggiano; Andreas König; Diego Said Said Schicchi; Mona Nazari Nazari Sam; Eddie Koenders. 2020. "Modelling the Thermal Energy Storage of Cementitious Mortars Made with PCM-Recycled Brick Aggregates." Materials 13, no. 5: 1064.
A micro-scale-based approach for the numerical analysis of cement-based materials, subjected to low-and high-cycle fatigue actions, is presented in this paper. The constitutive model is aimed at describing the evolving microstructural changes caused by cyclic loading protocols. More specifically, statistically representative microscopic geometries are equipped with a fracture-based model combined with a continuous inelastic constitutive law accumulating damage induced by the cyclic stress. The plastic-damage-based model is formulated combining the concepts of fracture-energy theories and damage stiffness degradations, representing the key phenomena occurring in concrete under fatigue. The paper explores the potential of the technique for assessing fatigue microcracks formation and growth, and their influence on the macroscopic behavior.
Antonio Caggiano; Diego Said Schicchi; Sha Yang; Stefan Harenberg; Viktoria Malarics-Pfaff; Matthias Pahn; Frank Dehn; Eduardus Koenders. A Microscale Approach for Modelling Concrete Fatigue Damage-Mechanisms. Key Engineering Materials 2019, 827, 73 -78.
AMA StyleAntonio Caggiano, Diego Said Schicchi, Sha Yang, Stefan Harenberg, Viktoria Malarics-Pfaff, Matthias Pahn, Frank Dehn, Eduardus Koenders. A Microscale Approach for Modelling Concrete Fatigue Damage-Mechanisms. Key Engineering Materials. 2019; 827 ():73-78.
Chicago/Turabian StyleAntonio Caggiano; Diego Said Schicchi; Sha Yang; Stefan Harenberg; Viktoria Malarics-Pfaff; Matthias Pahn; Frank Dehn; Eduardus Koenders. 2019. "A Microscale Approach for Modelling Concrete Fatigue Damage-Mechanisms." Key Engineering Materials 827, no. : 73-78.
Christoph Mankel; Antonio Caggiano; Eduardus Koenders. Thermal energy storage characterization of cementitious composites made with recycled brick aggregates containing PCM. Energy and Buildings 2019, 202, 1 .
AMA StyleChristoph Mankel, Antonio Caggiano, Eduardus Koenders. Thermal energy storage characterization of cementitious composites made with recycled brick aggregates containing PCM. Energy and Buildings. 2019; 202 ():1.
Chicago/Turabian StyleChristoph Mankel; Antonio Caggiano; Eduardus Koenders. 2019. "Thermal energy storage characterization of cementitious composites made with recycled brick aggregates containing PCM." Energy and Buildings 202, no. : 1.
This paper provides experimental results on investigations for the validation of photogrammetric strain measurements of ultra‐high‐performance concrete (UHPC)‐prisms subjected to static and cyclic bending‐tensile stress. For this purpose, 4 static and 5 cyclic test series were performed. Damage progresses during loading are monitored by means of a digital image correlation (DIC) system and a clip gauge. The control of the DIC by trigger lists and the measurement noise as a function of the measurement rate are examined. All static tests were performed force controlled with the same testing speed and the same measuring rate of DIC and clip gauge. All cyclic tests were performed with the same upper and lower stress levels but with different loading rates. During the static tests, the DIC can be used to make accurate strain measurements before UHPC failure. In the cyclic tests, the measurement noise of the DIC decreases with an increasing measuring rate. The tests performed confirm the control of the DIC by trigger lists for cyclic tests on UHPC‐prisms and show that the measurement noise is negligible in static and cyclic tests.
Stefan Harenberg; Matthias Pahn; Viktória Malárics‐Pfaff; Frank Dehn; Antonio Caggiano; Diego S. Schicchi; Sha Yang; Eddie Koenders. Digital image correlation strain measurement of ultra‐high‐performance concrete‐prisms under static and cyclic bending‐tensile stress. Structural Concrete 2019, 20, 1220 -1230.
AMA StyleStefan Harenberg, Matthias Pahn, Viktória Malárics‐Pfaff, Frank Dehn, Antonio Caggiano, Diego S. Schicchi, Sha Yang, Eddie Koenders. Digital image correlation strain measurement of ultra‐high‐performance concrete‐prisms under static and cyclic bending‐tensile stress. Structural Concrete. 2019; 20 (4):1220-1230.
Chicago/Turabian StyleStefan Harenberg; Matthias Pahn; Viktória Malárics‐Pfaff; Frank Dehn; Antonio Caggiano; Diego S. Schicchi; Sha Yang; Eddie Koenders. 2019. "Digital image correlation strain measurement of ultra‐high‐performance concrete‐prisms under static and cyclic bending‐tensile stress." Structural Concrete 20, no. 4: 1220-1230.
This study overviews existing methods for analyzing cement paste yield stress, and presents a new approach based on micro-structural computation. The proposed model explicitly considers cement particle interactions, both the colloidal and the nucleated gel ones. A new algorithm is proposed based on flocculating of poly-dispersed hard spheres in a simulation box, followed by nucleation of mono-sized nano-gel particles. The obtained virtual microstructures are than used as an input for a mechanical approach, which is conceptualized for simulating sliding kinematics needed to initiate the flow of the percolated solid network, i.e. to reach the paste yield stress. The microstructural modeling tool provides insights on how the localized gel is bridging the cement particles, responsible for the yield stress properties of bulk cement paste. Thus, it provides a promising new approach for quantifying the evolution of the bridging strength with nucleation (shear rest) time, enabling parametrization of the mechanical yield stress computation at micro-structural scale.
Neven Ukrainczyk; Antonio Caggiano; Diego Said Schicchi; Albrecht Gilka-Bötzow; Eddie Koenders. Hydrating Cement Particle Interaction Model for Yield Stress Analysis. High Performance Fiber Reinforced Cement Composites 6 2019, 636 -643.
AMA StyleNeven Ukrainczyk, Antonio Caggiano, Diego Said Schicchi, Albrecht Gilka-Bötzow, Eddie Koenders. Hydrating Cement Particle Interaction Model for Yield Stress Analysis. High Performance Fiber Reinforced Cement Composites 6. 2019; ():636-643.
Chicago/Turabian StyleNeven Ukrainczyk; Antonio Caggiano; Diego Said Schicchi; Albrecht Gilka-Bötzow; Eddie Koenders. 2019. "Hydrating Cement Particle Interaction Model for Yield Stress Analysis." High Performance Fiber Reinforced Cement Composites 6 , no. : 636-643.
Nowadays, the use of phase change materials (PCMs) represents a novel technique employed for retrofitting facades in existing buildings, mainly to fulfil temperature comfort and building energy efficiency requirements. The present study summarizes the results of a wide series of permeability tests carried out for understanding the moisture transport phenomena by capillary action in microencapsulated-PCM (MPCM) porous cementitious composites. Particularly, twelve MPCM cement-lime mortars are analyzed, which were cast with white cement, air lime, siliceous and lightweight aggregates (LWAs), short cellulose fibers and microencapsulated paraffin waxes. A total amount of 10% and 20% of MPCM by volume was added to the plain mixtures, and physical, mechanical and thermal properties of the composites were characterized. The experimental results are employed in an inverse identification procedure aimed at unveiling the key features of the capillary action in these partly saturated MPCM porous systems. A nonlinear FEM-based model for moisture transport phenomena is used with this purpose by adopting an extended Darcy’s law. The capillary pressure is considered to control the overall diffusion-driven mechanism. The outcome of the inverse calibration allows to better understand the influence of each material component (and specially focusing on the MPCM volume fraction) on the resulting diffusion parameters, capillary pressure and the Raleigh-Ritz pore size distribution of the analyzed porous cementitious composites. The inverse calibration procedure showed that MPCM mortars with high values of the Raleigh-Ritz (B) parameter exhibit a low capillary permeability performance. Particularly, it was observed that when MPCMs are added into the analyzed mortars, an increment of the B value is numerically obtained and a subsequent reduction of the permeability performance of the composites is obtained.
Cynthia Guardia; Diego Said Schicchi; Antonio Caggiano; Gonzalo Barluenga; Eduardus Koenders. On the capillary water absorption of cement-lime mortars containing phase change materials: Experiments and simulations. Building Simulation 2019, 13, 19 -31.
AMA StyleCynthia Guardia, Diego Said Schicchi, Antonio Caggiano, Gonzalo Barluenga, Eduardus Koenders. On the capillary water absorption of cement-lime mortars containing phase change materials: Experiments and simulations. Building Simulation. 2019; 13 (1):19-31.
Chicago/Turabian StyleCynthia Guardia; Diego Said Schicchi; Antonio Caggiano; Gonzalo Barluenga; Eduardus Koenders. 2019. "On the capillary water absorption of cement-lime mortars containing phase change materials: Experiments and simulations." Building Simulation 13, no. 1: 19-31.
Contexto: La producción de hormigón se caracteriza por una importante demanda de energía y materias primas, emitiendo grandes cantidades de gases de efecto invernadero (GEI). Asimismo, la construcción, mantenimiento y demolición de edificios genera enormes cantidades de residuos que requieren costosos y ambientalmente sensibles procedimientos de disposición final. Por tanto, en la actualidad se están investigando diversas soluciones para reducir el impacto ambiental de los procesos asociados al ciclo de vida del hormigón. Metodología: Se estudiaron, mediante ensayos experimentales, las propiedades físicas y mecánicas de los siguientes materiales sustentables: hormigón con agregados reciclados, hormigón con reemplazo parcial de cemento Portland por cenizas volantes y compuestos cementicios reforzados con fibras recicladas. Resultados: El uso de agregados gruesos reciclados degradó las características mecánicas del hormigón debido a su mayor porosidad y capacidad de absorción de agua. Sin embargo, su combinación con cenizas volantes mostró un efecto sinérgico, mitigando las consecuencias adversas mencionadas. La respuesta posfisuración del hormigón reforzado con fibras de acero recicladas se caracterizó por una menor tenacidad y ductilidad respecto a los compuestos con fibras industriales. Específicamente, las mezclas con fibras recicladas mostraron una etapa de ablandamiento más pronunciada. Esto reveló una eficiencia menor de las fibras recicladas con respecto a las industriales. Conclusiones: Los resultados experimentales demostraron que la incorporación de materiales reciclados condujo a un deterioro en el comportamiento físico y mecánico-resistente de los compuestos analizados. No obstante, las propiedades resultantes superaron los valores mínimos recomendados para su aplicación como materiales estructurales.
Hernán Xargay; Marianela Ripani; Antonio Caggiano; Paula Folino; Enzo Martinelli. Uso de materiales reciclados en compuestos cementicios. Tecnura 2019, 23, 38 -51.
AMA StyleHernán Xargay, Marianela Ripani, Antonio Caggiano, Paula Folino, Enzo Martinelli. Uso de materiales reciclados en compuestos cementicios. Tecnura. 2019; 23 (60):38-51.
Chicago/Turabian StyleHernán Xargay; Marianela Ripani; Antonio Caggiano; Paula Folino; Enzo Martinelli. 2019. "Uso de materiales reciclados en compuestos cementicios." Tecnura 23, no. 60: 38-51.
Christoph Mankel; Antonio Caggiano; Neven Ukrainczyk; Eduardus Koenders. Thermal energy storage characterization of cement-based systems containing microencapsulated-PCMs. Construction and Building Materials 2019, 199, 307 -320.
AMA StyleChristoph Mankel, Antonio Caggiano, Neven Ukrainczyk, Eduardus Koenders. Thermal energy storage characterization of cement-based systems containing microencapsulated-PCMs. Construction and Building Materials. 2019; 199 ():307-320.
Chicago/Turabian StyleChristoph Mankel; Antonio Caggiano; Neven Ukrainczyk; Eduardus Koenders. 2019. "Thermal energy storage characterization of cement-based systems containing microencapsulated-PCMs." Construction and Building Materials 199, no. : 307-320.
Accumulating solar and/or environmental heat in walls of apartment buildings or houses is a way to level-out daily temperature differences and significantly cut back on energy demands. A possible way to achieve this goal is by developing advanced composites that consist of porous cementitious materials with embedded phase change materials (PCMs) that have the potential to accumulate or liberate heat energy during a chemical phase change from liquid to solid, or vice versa. This paper aims to report the current state of art on numerical and theoretical approaches available in the scientific literature for modelling the thermal behavior and heat accumulation/liberation of PCMs employed in cement-based composites. The work focuses on reviewing numerical tools for modelling phase change problems while emphasizing the so-called Stefan problem, or particularly, on the numerical techniques available for solving it. In this research field, it is the fixed grid method that is the most commonly and practically applied approach. After this, a discussion on the modelling procedures available for schematizing cementitious composites with embedded PCMs is reported.
Antonio Caggiano; Christoph Mankel; Eddie Koenders. Reviewing Theoretical and Numerical Models for PCM-embedded Cementitious Composites. Buildings 2018, 9, 3 .
AMA StyleAntonio Caggiano, Christoph Mankel, Eddie Koenders. Reviewing Theoretical and Numerical Models for PCM-embedded Cementitious Composites. Buildings. 2018; 9 (1):3.
Chicago/Turabian StyleAntonio Caggiano; Christoph Mankel; Eddie Koenders. 2018. "Reviewing Theoretical and Numerical Models for PCM-embedded Cementitious Composites." Buildings 9, no. 1: 3.
This paper provides preliminary results of a research study on the fatigue behavior of Ultra‐High‐Performance Concrete (UHPC). Results of an experimental campaign, performed at the Department of Concrete Structures and Structural Engineering of the TU‐Kaiserslautern, are firstly proposed. The heterogeneous meso‐structure and material degradation of UHPC are studied through cyclic bending‐tensile tests. A test set‐up is specially developed at the TU‐Kaiserslautern to perform such activities. Particularly, different upper stress cycles (namely, cycle reversals) characterized by different force/stress amplitudes are considered and analyzed. The influence of the edge zone on the stress cycles is tested on notched and normal specimens while the results are used for composing a so‐called “Wöhler curve” of the materials' fatigue behavior. Damage progress during loading is monitored by means of a Digital Image Correlation system (DIC) and the results are used for improving the measurement accuracy. Based on these results, macroscopic and mesoscale simulations are performed at the TU‐Darmstadt‘s Institute of Construction and Building Materials. A meso‐mechanical approach for the numerical analysis of UHPC specimens subjected to low‐ and high‐cycle fatigue actions will be presented. The possibilities of modeling the material fracture response induced by fatigue is taken into account by means of a systematic use of zero‐thickness interface elements equipped with a fracture‐based model and combined with a continuous damage constitutive law. A plastic‐damage based model for concrete subjected to cyclic loading is developed combining the concept of fracture‐energy theories with a stiffness degradation, representing the key phenomenon occurring in concrete under cyclic responses. The experimental and numerical activities proposed in this paper stem out from the DFG Priority Program 2020 Project “Cyclic Damage Processes in High‐Performance Concretes in the Experimental Virtual Lab”.
Stefan Harenberg; Antonio Caggiano; Andreas Koenig; Diego Said; Albrecht Gilka‐Bötzow; Milan Schultz‐Cornelius; Sha Yang; Matthias Pahn; Frank Dehn; Eddie Koenders. Micromechanical behavior of UHPC under cyclic bending‐tensile loading in consideration of the influence of the concrete edge zone. PAMM 2018, 18, 1 -4.
AMA StyleStefan Harenberg, Antonio Caggiano, Andreas Koenig, Diego Said, Albrecht Gilka‐Bötzow, Milan Schultz‐Cornelius, Sha Yang, Matthias Pahn, Frank Dehn, Eddie Koenders. Micromechanical behavior of UHPC under cyclic bending‐tensile loading in consideration of the influence of the concrete edge zone. PAMM. 2018; 18 (1):1-4.
Chicago/Turabian StyleStefan Harenberg; Antonio Caggiano; Andreas Koenig; Diego Said; Albrecht Gilka‐Bötzow; Milan Schultz‐Cornelius; Sha Yang; Matthias Pahn; Frank Dehn; Eddie Koenders. 2018. "Micromechanical behavior of UHPC under cyclic bending‐tensile loading in consideration of the influence of the concrete edge zone." PAMM 18, no. 1: 1-4.
Antonio Caggiano; Enzo Martinelli; Diego Said Schicchi; Guillermo Etse. A modified Duvaut-Lions zero-thickness interface model for simulating the rate-dependent bond behavior of FRP-concrete joints. Composites Part B: Engineering 2018, 149, 260 -267.
AMA StyleAntonio Caggiano, Enzo Martinelli, Diego Said Schicchi, Guillermo Etse. A modified Duvaut-Lions zero-thickness interface model for simulating the rate-dependent bond behavior of FRP-concrete joints. Composites Part B: Engineering. 2018; 149 ():260-267.
Chicago/Turabian StyleAntonio Caggiano; Enzo Martinelli; Diego Said Schicchi; Guillermo Etse. 2018. "A modified Duvaut-Lions zero-thickness interface model for simulating the rate-dependent bond behavior of FRP-concrete joints." Composites Part B: Engineering 149, no. : 260-267.