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Articles 931 - 960 of 50072
Full-Text Articles in Entire DC Network
Fiber Reinforced Concrete Composites - Seminal Contributions Of Surendra Shah, Vellore S. Gopalaratnam, Wengui Li
Fiber Reinforced Concrete Composites - Seminal Contributions Of Surendra Shah, Vellore S. Gopalaratnam, Wengui Li
C3 Symposium 2025
The authors review the scholarly contributions of Surendra P. Shah during a prolific six-decade academic career in fiber reinforced concrete composites. This compilation includes discussions on often cited seminal publications encompassing experimental mechanics, analytical modeling, the development of test standards, materials characterization and innovations in the science of fiber reinforced concrete (FRC) materials. Collectively, these contributions have greatly improved our insights on how the nano- and micro-mechanics of such composites and processing techniques affect the macroscopic performance of creatively engineered reinforced cement composites. Starting with his Ph.D. the first contribution to understanding the inelastic behavior and fracture of concrete, the …
Concrete Material Bank In Japan Toward Co2 Recycling, Masaki Tamura, Takafumi Noguchi
Concrete Material Bank In Japan Toward Co2 Recycling, Masaki Tamura, Takafumi Noguchi
C3 Symposium 2025
Providing excellent performance as a structural material, concrete has long been essential for modern civilization and recognized as a material that will continue to maintain and support the development of human society. Now that recycling of concrete in a completely closed loop has become technically feasible, concrete is being seen in a new light. On the other hands, the huge issues regarding carbon dioxide emissions all of the world are a concern in the construction field as well as in society. To solve this problem, a concept for new Calcium Carbonate Concrete (CCC) is proposed. This paper is focused on …
Fresh And Mechanical Properties Of The Ultra-High-Performance Concrete With Cellulose Nanofibers, Xiaoli Xiong, Chengcheng Tao, Kamal H. Khayat
Fresh And Mechanical Properties Of The Ultra-High-Performance Concrete With Cellulose Nanofibers, Xiaoli Xiong, Chengcheng Tao, Kamal H. Khayat
C3 Symposium 2025
Water-sensitive cellulose significantly impacts the performance of the ultra-high-performance concrete (UHPC), leading to variations in its fresh and mechanical properties of fresh and hardened concrete materials. In this study, the cellulose nanofibers, a more environmentally friendly class of nanomaterials, are introduced into UHPC. The rheological and mechanical properties of UHPC are investigated, including viscosity, yield stress and compressive strength. The results reveal significant effect of cellulose nanofibers on the properties of UHPC in terms of material performance and sustainability. Advanced characterization techniques, including isothermal calorimetry, thermogravimetric analysis (TGA), and X-ray diffraction (XRD) are employed to study the effect of cellulose …
Upcycled Medical Hemp Fibers For Enhancing Tensile Strength And Fire Resistance Of High-Strength Concrete, Ahmed Almaadawy, Liahneli Knowles, Abigail Lazier, Srishti Banerji, Zach Haber, Bruce Bugbee
Upcycled Medical Hemp Fibers For Enhancing Tensile Strength And Fire Resistance Of High-Strength Concrete, Ahmed Almaadawy, Liahneli Knowles, Abigail Lazier, Srishti Banerji, Zach Haber, Bruce Bugbee
C3 Symposium 2025
This research investigates fire and tensile resistance of high-strength concretes employing fibers extracted from waste medical hemp stalks. Environmental impact analysis of hemp-based solutions is also considered.
Hempcrete As Low Carbon Solution For Thermal Retrofitting Of Buildings, Rotem Haik, Dor Lazar, Alva Peled
Hempcrete As Low Carbon Solution For Thermal Retrofitting Of Buildings, Rotem Haik, Dor Lazar, Alva Peled
C3 Symposium 2025
Thermal mortars are developed with hemp shives and pozzolans for thermal retrofitting of cultural heritage buildings, including concrete architecture from the 50s. The goal is to improve the thermal performance of the building, while reducing the carbon footprint. This research is within the framework of European Union’s Horizon 2020 (Sincere). A range of mixtures were developed based on standard mortar for plaster, as a reference. The research investigates the possibility of partly replacing the cement with pozzolans, as well as the sand in the mortar with fine hemp shives, to obtain lower EE and EC of the mixture, as compared …
Durability Of Sisal Fibers Reinforced Cement-Based Plates, Kaio Campos, Kíssila Goliath, L. Souza, F. Teixeira
Durability Of Sisal Fibers Reinforced Cement-Based Plates, Kaio Campos, Kíssila Goliath, L. Souza, F. Teixeira
C3 Symposium 2025
Sustainable materials have been gaining increasing attention in the construction sector due to their environmental advantages and the need for cost-effective solutions. An example of this is vegetable fibers, which are recognized as a sustainable and eco-friendly alternative for the reinforcement of cementitious composites in civil engineering applications. To contribute to our knowledge about the durability of these materials, this study investigated the mechanical behavior of cementitious plates reinforced with 5% long aligned sisal fibers materials after being subjected to accelerated aging. To improve the durability of the composite, 50% of the cement in matrix was replaced by 40% metakaolin …
Impact Of Inter-Grinding On The Reaction Kinetics And Physical Properties Of One-Part Alkali-Activated Metakaolin, Meddelin Setiawan, Claire E. White
Impact Of Inter-Grinding On The Reaction Kinetics And Physical Properties Of One-Part Alkali-Activated Metakaolin, Meddelin Setiawan, Claire E. White
C3 Symposium 2025
Developing alkali-activated materials (AAM) is one of the pathways to decarbonize cement manufacturing that currently contributes 5-8% of global anthropogenic carbon emissions [1]. However, extensive deployment of AAMs in industry has yet to be realized, part of which is due to the reluctance to work with “two-part” activation that requires handling large amounts of concentrated caustic solutions [2]. Here, a “one-part” AAM has been developed using calcined kaolin clay and a solid sodium silicate source. Inter-grinding of the dry mixture is found to increase the kinetics of alkali-activation and improve rheological properties of the paste. The underlying physicochemical properties responsible …
Viability Of Waste Glass Powder In Inter-Ground Alkali Activated Cement, Andrew Callender, Xander Babcock, Thien Tran, Maria Juenger
Viability Of Waste Glass Powder In Inter-Ground Alkali Activated Cement, Andrew Callender, Xander Babcock, Thien Tran, Maria Juenger
C3 Symposium 2025
No abstract provided.
Recovery Of Silica As Scm From Olivine Using Oxalic Acid-Enabled Chemical Comminution, Jie Shi, Hongyan Ma
Recovery Of Silica As Scm From Olivine Using Oxalic Acid-Enabled Chemical Comminution, Jie Shi, Hongyan Ma
C3 Symposium 2025
Using supplementary cementitious materials (SCMs) to substitute cement or clinker, as a decarbonization strategy, is limited by the shortage of conventional SCMs like GGBS, fly ash, and silica fume. Meanwhile, mafic/ultramafic minerals are unlimited to be processed for SCMs production. In this study, oxalic acid is used to dissolve olivine ((Mg, Fe)2SiO4) to produce amorphous silica. Results show that high purity amorphous silica could be successfully obtained and the yield can be up to 93.42%. This process endows the extra value of olivine alongside being used for carbon storage.
Oxcem: A Novel Carbon-Negative Cement Based On Oxalic Acid And Steel Slag, Xing Cheng, Jihui Qin, Hongyan Ma
Oxcem: A Novel Carbon-Negative Cement Based On Oxalic Acid And Steel Slag, Xing Cheng, Jihui Qin, Hongyan Ma
C3 Symposium 2025
The proper disposal of steel slag remains a challenging issue. This study explores a novel carbon-negative cement, utilizing the reaction between steel slag and oxalic acid. The mechanical properties, phase composition, and microstructure of OxCem were investigated through compressive strength tests, TG analysis, XRD, and MIP test. The results indicate that the optimal EAF/OA ratio is 3.5, achieving a 28-day compressive strength of 34.7 MPa. The strength enhancement of the paste is attributed to the influence of the reaction products, ferrous oxalate and calcium oxalate, on the pore structure.
Cement For Net-Zero Future: Energy-Resource-Carbon Neutral And Multifunctional, Jialai Wang, Xinhua Liang
Cement For Net-Zero Future: Energy-Resource-Carbon Neutral And Multifunctional, Jialai Wang, Xinhua Liang
C3 Symposium 2025
Ordinary Portland Cement (OPC)-based concrete, a cornerstone of modern infrastructure, is a major contributor to CO₂ emissions, resource depletion, and waste generation. OPC production accounts for 8% of global CO₂ emissions and consumes over 6 billion tons of raw materials annually, while concrete production uses 30 billion tons of aggregate and generates 2.2 billion tons of C&D waste yearly. This study introduces a novel manufacturing process that mitigates these impacts by utilizing waste streams as energy sources and raw materials while sequestering carbon as high-value CNTs. The resulting cement will enable next-generation concrete for resilient, net-zero infrastructure and advanced technologies …
Transforming Agricultural Residues Into High-Performance Scms Through Mechanochemical Activation, Dia Brown, Juan Pablo Gevaudan
Transforming Agricultural Residues Into High-Performance Scms Through Mechanochemical Activation, Dia Brown, Juan Pablo Gevaudan
C3 Symposium 2025
Despite the abundance of ashed agricultural residues and their potential as supplementary cementitious materials (SCMs), given a high silica content (up to 90 wt.%), their high water demand limits their use. This challenge compromises both the fresh-state workability and mechanical performance of supplemented concrete – a pivotal challenge for countries in the Global South with large agricultural sectors and low production of other industrial SCMs. To address this limitation, we investigate two innovative mechanochemical methods and their effects on the fresh-state workability issues of these ash-based SCMs. This presentation will share our latest results describing how the mechanochemical activation of …
Thermochemical Pre-Treatments On Corn Stover Ash To Boost Its Reactivity, P V P Moorthi, Zhihui Sun
Thermochemical Pre-Treatments On Corn Stover Ash To Boost Its Reactivity, P V P Moorthi, Zhihui Sun
C3 Symposium 2025
When treated properly, corn stover ash (CSA) is known to be an effective source of supplementary cementitious materials (SCM) for use in concrete. The influence of thermochemical pre-treatments on the reactivity of CSA was studied in this project. The result shows that acid pre-treatment was effective and necessary in the removal of organic and inorganic compounds from the corn stover. The pre-treatment conditions including type and concentration of acid used, temperature, pre-treatment duration, and the acid/ash (A/A) ratio are important factors that affect the reactivity of the final product. This study shows that a proper pre-treatment condition will lead to …
Hydrophobic Modification For The Design Of High-Performance And Ultra-High Performance Cementitious Composites, Iman Aghayan, Scott Muzenski, Reed T. Heintzkill, Marina I. Kozhukhova, Habib Tabatabai, Konstantin Sobolev
Hydrophobic Modification For The Design Of High-Performance And Ultra-High Performance Cementitious Composites, Iman Aghayan, Scott Muzenski, Reed T. Heintzkill, Marina I. Kozhukhova, Habib Tabatabai, Konstantin Sobolev
C3 Symposium 2025
This paper presents a novel method for designing high-performance and ultra-high-performance concrete (HPC/UHPC) through hydrophobic and nanomaterial modification. Three-dimensional hydrophobization of cementitious matrices is achieved by incorporating water-based emulsions of silico-organic compounds containing active hydrogen. The approach enables high-strength matrices with superior flexural performance via fiber reinforcement, further improved by uniformly distributed small air voids that promote multi-cracking and strain-hardening behavior. Incorporating aluminum oxide (Al₂O₃) nanofibers with 1% silica fume (or metakaolin) produces UHPC-grade strength and ductility while reducing chemical shrinkage and simplifying composition. Developed with Type V and I cements at W/CM < 0.3, the composites reached compressive strengths up to 195 MPa, exhibited high flowability, and showed excellent strain-hardening when reinforced with 2% synthetic macrofibers (PVA and HDPE), with HDPE yielding greater ductility. This synergy of hydrophobic modification, nanoengineered matrix, and synthetic fibers offers a cost-effective, sustainable alternative to conventional HPC/UHPC, exceeding durability and environmental performance benchmarks.
Multicomponent Portland Cement Composites Modified With Graphene Oxide: Hydration And Mechanical Properties, Małgorzata Safuta, Cataldo Valentini, Artur Ciesielski
Multicomponent Portland Cement Composites Modified With Graphene Oxide: Hydration And Mechanical Properties, Małgorzata Safuta, Cataldo Valentini, Artur Ciesielski
C3 Symposium 2025
We report here on the effect of the addition of graphene oxide on the basic properties of multicomponent Portland cements. Cement mortars incorporating two different dosages of graphene oxide (0.025 wt.% and 0.05 wt.%) were manufactured with the use of Portland cement containing limestone as well as cement containing granulated blast furnace slag, and, for comparison, ordinary Portland cement. We then further investigated the hydration heat by means of semi-adiabatic calorimetry, mechanical properties by means of flexural and compressive strength tests as well as comprehensive microstructural analysis of cement mortars at the age of 28 days, proving a considerable difference …
Effects Of Incorporating Colloidal Nano-Silica And Metakaolin On Mitigating Alkali-Silica Reaction, Mehrdad Razmara, Na (Luna) Lu, Yining Feng
Effects Of Incorporating Colloidal Nano-Silica And Metakaolin On Mitigating Alkali-Silica Reaction, Mehrdad Razmara, Na (Luna) Lu, Yining Feng
C3 Symposium 2025
Alkali-silica reaction (ASR) is a critical durability concern, as it can reduce the service life of structures and increase carbon emissions due to the need for early repair or replacement. In this study, the effects of incorporating colloidal nano-silica (CNS) and metakaolin (MK) to mitigate ASR have been investigated. The results show that the incorporation of CNS and MK effectively suppressed the ASR in mortar. As the CNS content increases from 4% to 6%, ASR induced length expansion decreases by 58%. On day 16, the CH content in the sample containing 10% MK and 2% CNS was 48% lower than …
Tailoring Ultra-High-Performance Concrete Toughness With Carbon Fibers: Linking Microstructure And Fracture Energy, J.D. Ríos, H. Cifuentes, G. Ruiz, D.C. González, M.A. Vicente, R.C. Yu, C. Leiva
Tailoring Ultra-High-Performance Concrete Toughness With Carbon Fibers: Linking Microstructure And Fracture Energy, J.D. Ríos, H. Cifuentes, G. Ruiz, D.C. González, M.A. Vicente, R.C. Yu, C. Leiva
C3 Symposium 2025
This paper presents a multiscale experimental study on the effect of carbon microfiber reinforcement on the fracture behavior of ultra-high-performance fiber-reinforced concrete (UHPFRC).Various fiber lengths (0.1–6 mm) and contents (1.2–20 kg/m³) were tested, linking microstructural features obtained via X-ray computed tomography (CT), mercury intrusion porosimetry (MIP), and scanning electron microscopy (SEM) to mechanical performance. Results show that a dosage of 6 kg/m³ of 3–6 mm fibers offers a balance between workability and fracture resistance, with fracture energy increasing up to 195% compared to plain concrete. This research provides insights for optimizing fiber type and content in UHPFRC for structural applications.
Cellulose Nanofibrils For Concrete Shrinkage Reduction, Erfan Najaf, Linfei Li, Eric Landis
Cellulose Nanofibrils For Concrete Shrinkage Reduction, Erfan Najaf, Linfei Li, Eric Landis
C3 Symposium 2025
Cracking in concrete structures, particularly under cold-weather conditions, significantly compromises durability and long-term performance. Early-age shrinkage is a primary contributor to crack formation, leading to increased maintenance demands and reduced service life. This study investigates the incorporation of Cellulose Nanofibrils (CNF) as a sustainable additive to mitigate shrinkage and enhance mechanical properties in both cement paste and concrete. Specimens were prepared with CNF dosages of 0%, 0.1%, 0.2%, 0.3%, 0.4%, and 0.5% by weight of cement. In cement paste, CNF addition up to 0.3% improved compressive and flexural strength by approximately 25% and 34%, respectively, and reduced shrinkage by 21%. …
Enhancing Optical Performance Of Cementitious Composites With Nano-Tio₂ Based Surface Treatment: A Cost-Effective Approach To Boost Solar Reflectance Index, Rui Bai, Marina Lopez-Arias, Mirian Velay-Lizancos
Enhancing Optical Performance Of Cementitious Composites With Nano-Tio₂ Based Surface Treatment: A Cost-Effective Approach To Boost Solar Reflectance Index, Rui Bai, Marina Lopez-Arias, Mirian Velay-Lizancos
C3 Symposium 2025
The Solar Reflectance Index (SRI) is a critical parameter for evaluating a material's ability to reflect solar radiation and release absorbed heat, affecting its surface temperature and thermal performance. Nano-titanium dioxide (NTiO₂) is widely used to enhance SRI in paints due to its high refractive index and light color; however, its high-cost limits large-scale intermixing applications for cementitious composites. This study investigates a cost-effective alternative by applying a NTiO₂-based cationic molecular emulsion as a surface treatment. Cement paste samples (5 × 5 × 1 cm for solar reflectance and 10 × 10 × 2 cm for emittance tests) were cast …
Assessing The Synergistic Role Of Nanosilica In The Performance Of Concrete With Natural Pozzolans, Alberto Castillo, Mirian Velay-Lizancos, Jan Olek
Assessing The Synergistic Role Of Nanosilica In The Performance Of Concrete With Natural Pozzolans, Alberto Castillo, Mirian Velay-Lizancos, Jan Olek
C3 Symposium 2025
With the diminishing availability of traditional supplementary cementitious materials, alternative options such as natural pozzolans (NPs) are emerging as promising alternatives. While NPs can significantly enhance the durability of concrete, their use often results in reduced early-age strength. Existing technical literature shows that when used in concrete, nanosilica (nS) provides nucleation sites for deposition of the hydrates, thus accelerating the hydration process and enhancing early-age strength development. Consequently, combining nS with NPs offers a promising, yet largely unexplored, pathway toward more sustainable and practical solutions for concrete construction. This study evaluates the combined effects of using NPs and nS in …
Comparison Of Magnetorheological Properties Of Fayalite Slag And Nano-Fe3o4 Incorporated Cement Mixtures, Mert Yücel Yardimci, Geert De Schutter
Comparison Of Magnetorheological Properties Of Fayalite Slag And Nano-Fe3o4 Incorporated Cement Mixtures, Mert Yücel Yardimci, Geert De Schutter
C3 Symposium 2025
One of the active rheology control methods involves adding magnetically-responsive mineral particles to fresh concrete and activating them by an external magnetic field, turning it into a magnetorheological (MR) fluid with controllable rheological properties. Nano-Fe₃O₄ is the most common material for MR cement, but other minerals also contain magnetizable phases. This study compares the MR properties of cement mixtures with fayalite slag and nano-Fe₃O₄.
Enhancing Early Strength Development Through Co2-Induced Hydration Acceleration, Patrick Rubaszewski, Thomas Matschei
Enhancing Early Strength Development Through Co2-Induced Hydration Acceleration, Patrick Rubaszewski, Thomas Matschei
C3 Symposium 2025
This study investigates the accelerating effect of gaseous CO2 on cement hydration.The addition of up to 0.2% CO2 by weight of cement during the mixing process led to increased compressive strength after 24 hours and greater heat release during the acceleration phase. However, higher concentrations negatively affected workability and hydration kinetics, resulting in lower compressive strength.
Functionalized Carbon Material In Cement-Based Composites, A Multivariate Approach, Luca Lavagna, Carlo Amata, Daniel Suarez-Riera, Matteo Pavese
Functionalized Carbon Material In Cement-Based Composites, A Multivariate Approach, Luca Lavagna, Carlo Amata, Daniel Suarez-Riera, Matteo Pavese
C3 Symposium 2025
This work describes the process that led to the optimization of compressive strength and fracture energy of a cement-based composite material enhanced with carbon allotropes: carbon nanotubes (CNTs), graphene nanoplatelets (GNPs), and carbon fibers (CFs). The goal was achieved through the use of a multivariate analysis system, modifying three variables corresponding to the quantities of CNTs, GNPs, and CFs. All the allotropes used in the study were subjected to functionalization to improve their wettability and interaction with the cement matrix. A face-centered central composite design (FCCD) was used as the experimental design, where these three variables were modified at three …
Graphene Reinforced Cement-Based Triboelectric Nanogenerator For Efficient Energy Harvesting, Wenkui Dong, Wengui Li
Graphene Reinforced Cement-Based Triboelectric Nanogenerator For Efficient Energy Harvesting, Wenkui Dong, Wengui Li
C3 Symposium 2025
This study investigated a graphene reinforced cement-based triboelectric nanogenerator (TENG) aimed at harvesting mechanical energies in infrastructure. The triboelectric layers of the cement-based TENG consisted of a fully cured graphene modified cement-based plate and a polytetrafluoroethylene (PTFE) film, which were tested under a contact-separation mode. Microstructural analysis indicated that the graphene was well-dispersed in the cementitious matrix, and the graphene-cement composites achieved excellent compressive and flexural strengths of 53.0 and 3.5 MPa, respectively. The electrical characteristics of the graphene-cement composites, specifically their resistivity and impedance, showed that they did not reach the percolation threshold, making them ideal dielectric materials with …
Responsive Functional Polymers And Nano-Particles For Active Control Of Concrete During Processing, Geert De Schutter
Responsive Functional Polymers And Nano-Particles For Active Control Of Concrete During Processing, Geert De Schutter
C3 Symposium 2025
The presentation summarizes two options to achieve active rheology control of concrete: switchable functional polymers and responsive nano-particles. Some potential applications are described, and remaining challenges are discussed.
Multi-Scale Assessment Of The Structural Performance Of 3d Printed Concrete, Manu Santhanam
Multi-Scale Assessment Of The Structural Performance Of 3d Printed Concrete, Manu Santhanam
C3 Symposium 2025
3D concrete printing (3DCP) has sparked a lot of interest in the concrete research community worldwide, because of the many possibilities that exist in design and fabrication of complex structures. Among other aspects, the determination of index properties governing the structural performance has been a major challenge for 3DCP. Unlike conventional concrete, where standard specimens can be mould cast to determine the response to different types of loading, the presence of interlayer joints in 3DCP leads to uncertainties regarding the representative volume element that should be considered for testing. As a result, there exist a number of methodologies around the …
Additive Manufacturing Of Ultra-High-Performance Concrete: From Mechanical Characterization To Large-Scale Application, Raul Marrero-Rosa, Shady Gomaa, Elmer Irizarry, Hassan Ahmed, Ayesha Ahmed, Jiaqi Liu, Gianluca Cusatis
Additive Manufacturing Of Ultra-High-Performance Concrete: From Mechanical Characterization To Large-Scale Application, Raul Marrero-Rosa, Shady Gomaa, Elmer Irizarry, Hassan Ahmed, Ayesha Ahmed, Jiaqi Liu, Gianluca Cusatis
C3 Symposium 2025
In this work, extensive experimental investigations were conducted on 3D printable Ultra-High-Performance Concrete (UHPC) at multiple scales. Initially, nanomodification techniques were employed to transform the self-leveling nature of UHPC into a more viscous mix using nanomaterials such as nano clay, which showed no detrimental effects on the mechanical performance of cast samples tested under uniaxial compression, split tension, and notched three-point bending. The developed mix then underwent a comprehensive experimental program to evaluate its rheological performance and was subsequently tested using various 3D printing systems featuring different automation setups, extrusion mechanisms, pumps, and nozzle configurations. To assess mechanical performance without …
Computational Simulations Fresh-To-Solid Transition For Additive Manufacturing Of Ultra-High-Performance Fiber Reinforced Concrete, Erol Lale, Bahar Ayhan, Ayesha Ahmed, Elmer Irizarry, Jiaqi Liu, Shady Gomaa, Raul Marrero-Rosa, Gianluca Cusatis
Computational Simulations Fresh-To-Solid Transition For Additive Manufacturing Of Ultra-High-Performance Fiber Reinforced Concrete, Erol Lale, Bahar Ayhan, Ayesha Ahmed, Elmer Irizarry, Jiaqi Liu, Shady Gomaa, Raul Marrero-Rosa, Gianluca Cusatis
C3 Symposium 2025
Additive manufacturing of concrete is a topic of interest within the academia and industry. Simulating the printable concrete behavior from the fresh state to hardened state to long-term will provide the future engineers the ability to optimize the design and predict failure of structural elements. A key aspect for concrete additive manufacturing is the complexity of optimization which includes systems, schedule, and materials. Our research focus on the simulation fresh state, hardened behavior, and the transition from fluid-to-solid of nanoclay modified ERDC ultra-high-performance fiber reinforced concrete system. Discrete fresh concrete model (DFC) and Smooth Particle Hydrodynamics (SPH) model are studied …
Effect Of Chemical Additives On Performance Of Low-Clinker 3d Printing Mortar, Jingjie Wei, Kamal H. Khayat
Effect Of Chemical Additives On Performance Of Low-Clinker 3d Printing Mortar, Jingjie Wei, Kamal H. Khayat
C3 Symposium 2025
The study investigates the effect of three chemical accelerators, nano-C-S-H solution agent (NCSH), organic composite accelerator (OC), and an aluminum sulfate-based accelerator (FA), on the performance of low-clinker 3D printing mortar. The mixture with 80% clinker replacement, consisting of 20% cement, 40% limestone filler, and 40% slag was set. Using 2% OC significantly enhanced the compressive strength, increasing 3- and 28-day compressive strength by 47% and 18%, respectively, compared to ref. mixture. Adding 2% OC can accelerate setting time by 35%, compared to the ref mixture. The OC-type accelerator was recommended for low-clinker 3D printing mixture.
Advancing Underwater Construction With 3d Printing: A Two-Stage Approach, Onur Ozturk, Caleb Lunsford, Sriramya Duddukuri Nair
Advancing Underwater Construction With 3d Printing: A Two-Stage Approach, Onur Ozturk, Caleb Lunsford, Sriramya Duddukuri Nair
C3 Symposium 2025
Underwater concreting presents a unique challenge, requiring advanced materials and construction methods to endure harsh submerged environments. Traditional techniques often encounter difficulties in adapting to the dynamic underwater conditions. In contrast, 3D concrete printing (3DCP) offers a revolutionary alternative, enabling automated, precise, and highly customizable fabrication of resilient underwater structures. This study introduces a two-stage cementitious 3D printing system that dynamically adjusts accelerator dosages at the nozzle, optimizing printability in submerged conditions. Evaluations in both air and underwater settings reveal that real-time dosage control effectively addresses critical challenges, overcoming the limitations of pre-mixed underwater admixtures (reduced flowability and compromised strength) …