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Articles 511 - 540 of 25416
Full-Text Articles in Entire DC Network
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 …
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.
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 …
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 …
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) …
Magnetic Technologies For A Carbon Conscious Concrete, Sriramya Duddukuri Nair, Onur Ozturk
Magnetic Technologies For A Carbon Conscious Concrete, Sriramya Duddukuri Nair, Onur Ozturk
C3 Symposium 2025
Concrete has long been a cornerstone of civil infrastructure due to its strength, versatility, and cost-effectiveness. However, as global construction demands increase, so do concerns about the environmental impact of concrete production, particularly its significant carbon footprint. In recent years, numerous advanced materials and innovative methods have been explored to enhance concrete performance while minimizing its ecological impact. These advancements include the incorporation of alternative cementitious materials, self-healing agents, and 3D printing technologies. Among the emerging techniques, the use of magnetic fields to improve concrete properties has garnered considerable attention, as evidenced by the growing body of research over the …
Effect Of Absorption Kinetics Of Superabsorbent Polymer On 3d Printing Characteristics, Yucun Gu, Seongho Han, Kamal H. Khayat
Effect Of Absorption Kinetics Of Superabsorbent Polymer On 3d Printing Characteristics, Yucun Gu, Seongho Han, Kamal H. Khayat
C3 Symposium 2025
This study evaluates the effect of different superabsorbent polymers (SAP) types on rheological properties, printability, and mechanical properties of 3D concrete printing (3DCP). Three types of SAP, including two acrylamide-co-acrylic polymers with coarse and fine particle sizes (S1 and S2) and an acrylic copolymer (S3), were employed. Results showed that the use of S1 and S2 SAP exhibiting high retention ability enhanced thixotropy, whereas the S3 SAP with rapid desorption reduced thixotropy. The S1 SAP was the most significant in maintaining a higher internal relative humidity, thus resulting in higher 28-d compressive strength. The reduction in 28-day compressive strength for …
Mechanics Of Fracture In Layered Architected Materials, Reza Moini, Aimane Najmeddine, Shashank Gupta
Mechanics Of Fracture In Layered Architected Materials, Reza Moini, Aimane Najmeddine, Shashank Gupta
C3 Symposium 2025
This talk asks the role of mechanics of materials, particularly fracture mechanics in design and engineering civil infrastructure materials. Concrete, a quasi-brittle material is the backbone of the civil infrastructure. Decades of research on engineering and fracture mechanics of concrete led by the hundreds of pioneering works of great scholars, have helped us understand mechanism of crack initiation and propagation in heterogeneous materials. However, there remain a significant need to continue understand mechanics of damage in conventional and novel heterogeneous infrastructure materials. Growth in automation and robotics (e.g., 3D-printing), innovative cementitious composite materials (e.g., architected material), and numerical frameworks (e.g., …
Performance-Based Design Of 3d Printable Cement Composite Using Locally Available Materials, Haodao Li, Kamal H. Khayat
Performance-Based Design Of 3d Printable Cement Composite Using Locally Available Materials, Haodao Li, Kamal H. Khayat
C3 Symposium 2025
Proportioning 3D printable materials using locally available resources offers significant environmental and economic benefits while supporting local communities. This study proposes a performance-based design approach to adapt these materials into printable mixtures, focusing on key fresh and hardened properties. Binder combinations made with locally available materials were initially optimized for enhanced packing density and flow characteristics. Optimized candidates were narrowed down using a radar chart method based on multivariate criteria closely linked to printing performance.The printability of the optimized cement composites was subsequently validated. Developing such print materials enhances the cost-effectiveness of 3D printing in construction and expands its applicability …
Developing 3d Printable Concrete Using Quarry By-Products As Partial Replacement For Cement, Tippabhotla A. Kamakshi, Bao Chau, Aidyn Tugelbayev, Andrew P. Mccoy, Alexander S. Brand
Developing 3d Printable Concrete Using Quarry By-Products As Partial Replacement For Cement, Tippabhotla A. Kamakshi, Bao Chau, Aidyn Tugelbayev, Andrew P. Mccoy, Alexander S. Brand
C3 Symposium 2025
3D concrete printing (3DCP) is rapidly growing due to its wide range of advantages over conventional cast concrete. However, one major concern is that it 3DCP mixes typically have high cement contents and have a high carbon footprint as a result. To address this concern, this study incorporates quarry by-products (e.g., pond fines, screenings) in 3DCP mixes, which serves as a rheology modifier and serves to reduce the cement content. Pond fines were used as a partial replacement of cement, and screenings were used as the fine aggregate. The resultant mixtures demonstrated adequate compressive strength, higher compressive strength, and improved …
Green 3d Printing Concrete Containing Biochar And Waste Wind Turbine Blade Powder, Ping Lyu, Kejin Wang, Shelby Doyle, Simon Laflamme, Sri Sritharan
Green 3d Printing Concrete Containing Biochar And Waste Wind Turbine Blade Powder, Ping Lyu, Kejin Wang, Shelby Doyle, Simon Laflamme, Sri Sritharan
C3 Symposium 2025
Three green three-dimension printing concrete (3DPC) mixtures were made with biochar (BC), waste wind turbine blade powder (WTBP), and a pre-packaged 3DPC material (Sika-752). The mixtures were used to print small and larger beams with various fill patterns/rates. The results indicate that use of 3%BC (wetted with mixing water) and10% WTBP improved fluidity, especially slump, of the 3DPC mixture. 3%BC slightly reduced strength and ductility of the 3DPC. 10% WTBP decreased strength but increased ductility of the printed specimens. Optimized infill can improve load capacity. The use of BC and WTBP in 3DPC has promising potential in construction engineering applications.
Enhanced Shape Stability Of Flowable Mortar Through Co2 Injection For 3d Concrete Printing Application, Seongho Han, Alfred Addai-Nimoh, Yucun Gu, Kamal H. Khayat
Enhanced Shape Stability Of Flowable Mortar Through Co2 Injection For 3d Concrete Printing Application, Seongho Han, Alfred Addai-Nimoh, Yucun Gu, Kamal H. Khayat
C3 Symposium 2025
This study explores the direct injection of CO2 into the 3D printer head during the printing process, enabling real-time control of yield stress evolution in flowable mixtures. CO2 concentrations ranging from 0.5% to 1.4% by cement weight were tested by varying injection times. CO2 injection reduced slump flow of mortar from 250 to 100 mm, as reflected in the decreased width and increased height of printed layers. Mortar with 0.5% CO2 maintained flowability but experienced shape collapse during layer stacking, while higher CO2 concentrations led to nozzle blockages.
Setting Limits From Coast To Coast-Us Buy Clean Policies To Decarbonize Concrete, Tien Y. Peng
Setting Limits From Coast To Coast-Us Buy Clean Policies To Decarbonize Concrete, Tien Y. Peng
C3 Symposium 2025
Several authorities have implemented Buy Clean policies with different scopes, regulatory frameworks, and incentives for implementation. These policies measure the reduction of global warming potential of "eligible materials" using Environmental Product Declarations. Many programs also require agencies to implement a “limit” to the carbon dioxide emissions of industrial materials. By assessing the different programs with established emission limits and quantifying the reductions against the industry benchmarks, we can evaluate their impacts to a diverse group of stakeholders, not just those who manufacture concrete. Policy makers, manufacturers, architects and engineers must become aware of the limitations of the reporting tools to …
Performance Of Low-Embodied Co2 And High Early-Age Strength Concrete Full-Sized Slabs, Fabian Paniagua, Eric P. Bescher
Performance Of Low-Embodied Co2 And High Early-Age Strength Concrete Full-Sized Slabs, Fabian Paniagua, Eric P. Bescher
C3 Symposium 2025
High early strength and low-embodied CO2 concretes were analyzed in full-sized slabs under California weather. Belitic calcium sulfoaluminate (BCSA), ordinary portland cement (OPC), portland limestone cement (PLC), and calcined clay (CC) were the used cementitious materials. Each material was designed to obtain a flexural strength of 2.76 MPa (400 psi) at opening time, which varied depending on the material between 4 and 10 hours. One individual slab of 4.5 x 3.6 m (15 x 12 ft) with a thickness of 23.5 cm (9.25 in) was analyzed for each material. Thermocouples and vibrating-wire strain gages (VWSG) were installed at the corner …
Building Better, For Longer, With Less: A “Holistic” Approach To Material And Structural Concept And Design With Advanced Cement Based Materials, Liberato Ferrara
Building Better, For Longer, With Less: A “Holistic” Approach To Material And Structural Concept And Design With Advanced Cement Based Materials, Liberato Ferrara
C3 Symposium 2025
The paper presents, as the summary of a more than a decade long research performed by the author’s research group, an approach which combines, in a holistic life cycle thinking framework, higher and longer lasting material performance with enhanced structural functionality. The signature high resilience material concept also features the possibility of engineering the structural performance over time through its self-healing capacity, i.e. the ability of the material to self-repair cracks without external intervention but thanks to its suitably designed composition. Concretes are no longer regarded as providers of passive protection, whose degradation over time has to be delayed as …
The Handy Rheometer: Capturing Complex Rheology With Just A Camera And A Cylinder, Yohan Jacquet, Inka Mai
The Handy Rheometer: Capturing Complex Rheology With Just A Camera And A Cylinder, Yohan Jacquet, Inka Mai
C3 Symposium 2025
The growing need for practical, on-site rheological tools in 3D concrete printing motivates this study, which introduces a low-cost, computer-vision based method for characterizing complex flow behavior. A simple experiment is performed by pulling a cylinder through a fresh cementitious suspension while recording the surface motion of a contrasted reference line on the suspension’s surface simply using a camera. A computer vision algorithm tracks the displacement field, enabling precise velocity profile extraction over time. By applying a moment balance to the two flow regions – Couette and Poiseuille – the flow is modeled as a Herschel-Bulkley fluid. This approach enables …
Impact Of Additive-Based Frost Protection On Co2, Cost, And Rheology On Cold-Weather Self-Consolidating Concrete, Gilson R. Lomboy, Aljon S. Moraña
Impact Of Additive-Based Frost Protection On Co2, Cost, And Rheology On Cold-Weather Self-Consolidating Concrete, Gilson R. Lomboy, Aljon S. Moraña
C3 Symposium 2025
Cold weather concreting (CWC) generally refers to practices used to place concrete during cold weather. Traditionally, concrete placement in cold weather is accomplished by one or more precautions and procedures, such as pre-heating water and/or aggregates, insulating the concrete with protective blankets during curing, or heating the concrete or the surrounding concrete. However, these procedures can be energy-intensive, resulting in a shortened construction season in cold regions. Additive-based freeze protection (ABFP) is an alternative approach to casting and curing concrete at cold temperatures that reduces energy costs compared to traditional CWC techniques and potentially extends the construction season. Cold-weather self-consolidating …
Effects Of Workability Modifiers Blending On Fresh Properties Of Limestone Metakaolin Blended Cement, Thien Tran, Daniel Benkeser, Kimberly E. Kurtis, Newell Washburn, Kejin Wang, Maria C.G. Juenger
Effects Of Workability Modifiers Blending On Fresh Properties Of Limestone Metakaolin Blended Cement, Thien Tran, Daniel Benkeser, Kimberly E. Kurtis, Newell Washburn, Kejin Wang, Maria C.G. Juenger
C3 Symposium 2025
It is widely acknowledged that metakaolin in blended cements improves engineering properties and durability. However, it reduces the blend’s fresh flowability and shortens slump retention time. In this investigation, three workability modifiers (WM) were used to fluidize a mixture of ASTM C595 Type IL cement containing 15 wt.% metakaolin, called limestone metakaolin-blended cement (LMC). The study aimed to use WMs and their combinations to curb the workability loss of the LMC system. Dosages of each WM and blends of them for the LMC system were determined in which the LMC reached neat-cement equivalent yield stress and similar flowability and workability …
Improving Workability Of Recycled Cement Pastes, Susanne Helmich, Doru C. Lupascu
Improving Workability Of Recycled Cement Pastes, Susanne Helmich, Doru C. Lupascu
C3 Symposium 2025
Laboratory produced cement stone was reactivated through thermal treatment at 650°C. Superplasticizers added to improve flowability of reactivated cement pastes and reduce their water demand.
Mechanistic Study Of The Improvement Of Lc3 Rheological Properties By Pce Superplasticizers- A Comparative Study With Opc System, Ran Li, Jinlong Xue, Yanru Wang, Jiuwen Bao, Jie Shi, Tongbo Sui
Mechanistic Study Of The Improvement Of Lc3 Rheological Properties By Pce Superplasticizers- A Comparative Study With Opc System, Ran Li, Jinlong Xue, Yanru Wang, Jiuwen Bao, Jie Shi, Tongbo Sui
C3 Symposium 2025
Recently, LC3 attracts more and more attentions due to low CO2 emission. Understanding the mechanisms of PCEs on LC3 rheology is crucial for advancing its application. This study investigates the rheological properties of LC3 and ordinary Portland cement (OPC) in response to PCE superplasticizers. HPEG PCEs were successfully synthesized via free radical copolymerization with varying acrylic acid (AA) to macromonomer (MM) ratios, and their quality were characterized using Gel Permeation Chromatography (GPC). Fluidity tests and rheology measurements revealed that PCEs enhance fluidity and reduce dynamic yield stress and plastic viscosity in both systems, although LC3 requires a higher PCE dosage …
Assessment Of Textured Epoxy-Coated Rebars In Concrete For Chloride Induced Corrosion, Kevin Danner, Shayan Ali Khan, John S. Popovics
Assessment Of Textured Epoxy-Coated Rebars In Concrete For Chloride Induced Corrosion, Kevin Danner, Shayan Ali Khan, John S. Popovics
C3 Symposium 2025
Textured-Epoxy coated rebar (TEC) differs from conventional Epoxy coated rebar (ECR) due to its rougher exterior surface – which aims to reduce cracking in concrete and development length. However, no studies have investigated the long-term corrosion response behavior of both TEC and ECR when subjected to service-level bridge deck displacement criteria. This study utilizes Non-Destructive Testing techniques such as Half-Cell Potential (HCP), Ground Penetrating Radar (GPR), Ultrasonic Pulse Velocity (UPV), and Linear Polarization Resistance (LPR) to characterize the corrosion response behavior of service-level stressed TEC and ECR reinforced concrete samples subjected to a realistic chloride environment.
Comparative Analysis Of The Corrosion Resistance Epoxy-Coated, Textured Epoxy-Coated, And Uncoated Reinforcement Bars, Shayan Ali Khan, Kevin Danner, John S. Popovics
Comparative Analysis Of The Corrosion Resistance Epoxy-Coated, Textured Epoxy-Coated, And Uncoated Reinforcement Bars, Shayan Ali Khan, Kevin Danner, John S. Popovics
C3 Symposium 2025
The corrosion of steel reinforcement inside concrete remains a significant challenge for the construction industry. In the United States alone, an estimated annual cost of $240 billion is incurred from corrosion-related damage, with about 20% attributed to the corrosion of reinforced concrete [1]. Among various corrosion prevention techniques for reinforced concrete, epoxy coating of rebars (EC), has been widely adopted. However, due to the smooth surface of epoxy coating, its bond strength with concrete is reduced significantly, which has become a barrier for its large-scale adoption [2]. To tackle this, Sherwin Williams developed textured epoxy coated rebars (TEC) (figure 1a) …
Concrete Conductivity/Resistivity With Conductive Aggregate, W. Jason Weiss, O. Burkan Isgor
Concrete Conductivity/Resistivity With Conductive Aggregate, W. Jason Weiss, O. Burkan Isgor
C3 Symposium 2025
The electrical properties of concrete (formation factor) are often used as a surrogate test method to assess fluid transport in concrete primarily because resistivity (or conductivity) can be measured rapidly and economically. While electrical properties have been measured for nearly a century, the recent rise in handheld, battery-operated testing tools coupled with the desire to quantify the transport performance of concrete has caused a sudden spike in interest in electrical property measurements as a quality control or quality acceptance tool. Standards have been developed (AASHTO T 358, AASHTO T 402, ASTM C1876) with an emphasis on the role of sample …
Recycling Waste Glass Powder In Lightweight Aggregate Concrete: Towards Lightweight, Sustainable And Durable Marine Engineering Structures, Bin Jia, Yuxi Zhao
Recycling Waste Glass Powder In Lightweight Aggregate Concrete: Towards Lightweight, Sustainable And Durable Marine Engineering Structures, Bin Jia, Yuxi Zhao
C3 Symposium 2025
This study investigates the feasibility of incorporating waste glass powder (GP) as a sustainable supplementary cementitious material in structural lightweight aggregate concrete (SLAC) for marine applications. The effects of GP replacement (0–40%) on the fresh, mechanical, and durability properties were evaluated. Results showed that while GP reduces early-age strength, long-term mechanical stability is maintained, with GP20 achieving the highest elastic modulus. GP incorporation significantly improves durability, including reduced chloride migration, lower water absorption, and higher electrical resistivity. Corrosion resistance of steel bars under chloride exposure was enhanced, as indicated by higher open-circuit potential values (OCP). Microstructural analysis revealed that GP …