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Articles 1051 - 1080 of 50072
Full-Text Articles in Entire DC Network
Activation Of Self-Healing In Pozzolanic Natural Hydraulic Lime-Based Self-Compacting Concrete Under Cyclic Compression, Ángel De La Rosa, Gonzalo Ruiz
Activation Of Self-Healing In Pozzolanic Natural Hydraulic Lime-Based Self-Compacting Concrete Under Cyclic Compression, Ángel De La Rosa, Gonzalo Ruiz
C3 Symposium 2025
This study investigates the activation of autogenous self-healing in sustainable pozzolanic hydraulic lime self-compacting concrete under cyclic compressive loading. This cement-free formulation enhances crack closure and mechanical resilience, offering a promising alternative that improves durability and long-term performance for eco-friendly construction and restoration of heritage or low-carbon infrastructure.
Reactivating Recycled Hydrated Cement Into A Value-Added Cementitious Material Using Co2, Hamed Maraghechi, Luis Baquerizo Ibarra, Shayan Gholami, Deepika Sundar, Azadeh Hosseinpanahi
Reactivating Recycled Hydrated Cement Into A Value-Added Cementitious Material Using Co2, Hamed Maraghechi, Luis Baquerizo Ibarra, Shayan Gholami, Deepika Sundar, Azadeh Hosseinpanahi
C3 Symposium 2025
The mineralization of CO₂ from industrial emissions using hydrated cement components, primarily sourced from abundant end-of-life concrete or other waste concrete materials, could provide a unique pathway for reducing GHG emissions associated with the construction industry. Calcium silicate hydrates, along with other hydrated and unhydrated clinker phases, undergo dissolution- precipitation reactions, forming stable calcium carbonates and amorphous decalcified silicate-rich phases, which can be utilized as supplementary cementitious materials. This work demonstrates the characteristics of CO₂ mineralization in hydrated cement paste materials and the resulting products.
Rice Straw Ash As A Sustainable Cementitious Binder: Investigations Into Pretreatment And Performance, Deepak Babu, Athira Gopinath
Rice Straw Ash As A Sustainable Cementitious Binder: Investigations Into Pretreatment And Performance, Deepak Babu, Athira Gopinath
C3 Symposium 2025
As part of its sustainable development goals, India has been promoting biomass-to-energy projects to convert agricultural waste into renewable energy and reduce pollution from the open burning of residues. Rice straw-fuelled power plants in northern India generate large quantities of rice straw ash (RSA) as a by-product. RSA has probable use as a supplementary cementitious material (SCM), but there is limited literature. This study aimed to characterise RSA from three different power plants and investigate its feasibility as an SCM. Analysis revealed that RSA contains silica but has a larger proportion of Potassium Chloride (KCl) contributing to a low strength …
Environmental And Economic Evaluation Of Sustainable Concrete, Ehsan Asheghianamiri, Mahelet Fikru, Hongyan Ma
Environmental And Economic Evaluation Of Sustainable Concrete, Ehsan Asheghianamiri, Mahelet Fikru, Hongyan Ma
C3 Symposium 2025
Concrete, as the most used material in construction industry, shows a great potential to reduce greenhouse gas emissions. Substituting cement, as the most expensive and environmentally detrimental concrete component, with innovative material would improve concrete environmental and economic performance. This study explores CO2-mineralized solid waste as a cost-effective supplementary cementitious material that matches conventional concrete’s strength in the same class, while lowering its environmental impact. Life cycle assessment and techno-economic analysis will be employed to quantify the environmental performance and economic feasibility of concrete, respectively.
Engineering Performance Of Semi-Flowable Concrete With High-Volume Indigenous Scms, Arash Aghaeipour, Jingjie Wei, Kamal H. Khayat, Roberta Alfani, Erisa Myrtja
Engineering Performance Of Semi-Flowable Concrete With High-Volume Indigenous Scms, Arash Aghaeipour, Jingjie Wei, Kamal H. Khayat, Roberta Alfani, Erisa Myrtja
C3 Symposium 2025
Enhancing clinker efficiency and increasing limestone filler (LF) in binder are essential for engineering applications. This study explores the high-volume substitution of Portland cement, with 50 wt.% LF and up to 30 wt.% traditional SCMs, in semi-flowable concrete (SFC), evaluating properties of SFC. A slump of 200 mm was achieved, with retentions above 130 mm after 70 minutes for SFC mixtures. The 28-day compressive and flexural strengths of SFC exceeded 30 MPa and 3.2 MPa, respectively, meeting structural performance benchmarks (ACI 318, ASTM C94). LF replacement rate in binder exceeding 10% reduces strength of SFC due to LF’s lack of …
Performance Of Low-Clinker, High-Limestone Multiphase Blended Cement, Muhammad Haris Javed, Jingjie Wei, Kamal H. Khayat, Roberta Alfani, Erisa Myrtja, Hongyan Ma
Performance Of Low-Clinker, High-Limestone Multiphase Blended Cement, Muhammad Haris Javed, Jingjie Wei, Kamal H. Khayat, Roberta Alfani, Erisa Myrtja, Hongyan Ma
C3 Symposium 2025
This study evaluates mechanical properties and porosity of binders combining Portland Limestone Cement (PLC) with SCMs like GGBFS, Class C (FAC), and Class F (FAF) fly ashes. GGBFS-based binders showed the highest compressive strength of 33.35MPa and lowest porosity (of 41.9%) due to their high reactivity, while FAF-based binders had lower strength and higher porosity (of 14.5 MPa and 47.3%), due to slower pozzolanic reactions. SCM combinations balanced reactivity and densification, offering a pathway for sustainable, high-performance binder development.
Evaluating The Risk Of Internal Sulfate Attack In Concrete Containing High-So₃ Coal Ashes: A Path Toward Low-Carbon Concrete, Moe Sharbaf, Arslan Akbar, Mahdi Mirabrishami, Kamasani Chiranjeevi Reddy, Farshad Rajabipour
Evaluating The Risk Of Internal Sulfate Attack In Concrete Containing High-So₃ Coal Ashes: A Path Toward Low-Carbon Concrete, Moe Sharbaf, Arslan Akbar, Mahdi Mirabrishami, Kamasani Chiranjeevi Reddy, Farshad Rajabipour
C3 Symposium 2025
High-SO₃ fly ashes (FA), including reclaimed landfilled and ponded ashes, present a significant opportunity to decarbonize concrete through clinker substitution. However, their use is restricted by ASTM C618, which limits SO₃ content to 5.0% due to concerns over internal sulfate attack. This study evaluates the expansion risk in concrete containing high-SO₃ fly ashes (both real and doped) and investigates the underlying expansion mechanisms. The results demonstrate that fly ashes exceeding 5.0% SO₃ can be safely used if they pass the ASTM C1038 lime water expansion test at the intended dosage. Specifically, fly ashes with up to 12.0% SO₃ at 20% …
Performance Evaluation Of Concrete Mixtures With Calcined Clay And Portland Limestone Cement, Zhangfan Jiang, Gabriel Arce, Amir Behravan, Lisa M. Colosi, Osman E. Ozbulut
Performance Evaluation Of Concrete Mixtures With Calcined Clay And Portland Limestone Cement, Zhangfan Jiang, Gabriel Arce, Amir Behravan, Lisa M. Colosi, Osman E. Ozbulut
C3 Symposium 2025
Calcined clay offers a promising solution to the environmental challenges associated with traditional concrete production, which relies heavily on portland cement and significantly contributes to global carbon emissions. This study investigates the potential of calcined clay as a sustainable supplementary cementitious composite (SCM) for concrete applications, focusing on its integration into portland limestone cement (PLC) systems at 30% and 50% replacement ratios. For comparison, concrete mixtures with PLC alone, PLC with 30% reclaimed fly ash, and PLC with 50% slag—representative of conventional SCM practices—are also studied. The study evaluates fresh and hardened properties, hydration mechanisms, and environmental impacts through a …
Exploring Use Of Biochar From Different Feedstock As Cement Replacement In Cementitious Composites, Mohammed Alsieedi, Zhangfan Jiang, Mert Atilhan, Osman E. Ozbulut
Exploring Use Of Biochar From Different Feedstock As Cement Replacement In Cementitious Composites, Mohammed Alsieedi, Zhangfan Jiang, Mert Atilhan, Osman E. Ozbulut
C3 Symposium 2025
The construction industry is a major contributor to global carbon emissions, with cement production alone responsible for significant greenhouse gas outputs. To address this challenge, biochar, a carbon-rich material derived from biomass through pyrolysis, has emerged as a potential supplementary cementitious material (SCM). This study examines the impact of biochar feedstock types (rice husk, hardwood, and softwood) and particle sizes (<20 μm, 53–149 μm, and 149–300 μm) on the performance of cementitious composites. The biochar materials were comprehensively characterized using Fourier Transform Infrared Spectroscopy (FTIR) to analyze their chemical structure and functional groups, X-ray Fluorescence (XRF) spectrometry to determine their chemical composition, and Scanning Electron Microscopy (SEM) to evaluate surface morphology and porosity. Isothermal calorimetry tests assessed the hydration behavior of cement pastes with 5%, 10%, and 20% biochar replacement, monitoring heat flow and cumulative heat release over 78 hours. Additionally, compressive strength tests evaluated the mechanical properties of biochar-incorporated composites, flow table tests examined workability, and thermal conductivity tests assessed the insulating properties of the resulting materials.
The Water Absorption Of Alternative Supplementary Cementitious Materials And Its Impact On The Rheological Properties Of Fresh Paste, Fengyin Du, Julien Hubert, O. Burkan Isgor, W. Jason Weiss
The Water Absorption Of Alternative Supplementary Cementitious Materials And Its Impact On The Rheological Properties Of Fresh Paste, Fengyin Du, Julien Hubert, O. Burkan Isgor, W. Jason Weiss
C3 Symposium 2025
Supplementary cementitious materials (SCMs) are used to reduce the global warming potential (GWP) of concrete as cement replacements. ASTM 311 has historically been used to determine the water demand of SCMs; however, recent work has shown that the specific gravity, particle shape, and water absorption of the SCM can all impact the water demand. Alternative SCMS can have variable composition, specific gravity, reactivity, surface area, and water absorption. This study evaluates the rheology and setting time of alternative SCMs after accounting for their specific gravity and internal porosity. The yield stress development and water absorption of the natural pozzolans (NPs) …
Exploring The Use Of Cattle Manure Digestate Ash For Partial Cement Replacement In The Production Of Concrete, Georges Fahd Khoury, Jessica Ensini, Francesca Ferretti, Enrico Sassoni, Marco Bovo, Claudio Mazzotti
Exploring The Use Of Cattle Manure Digestate Ash For Partial Cement Replacement In The Production Of Concrete, Georges Fahd Khoury, Jessica Ensini, Francesca Ferretti, Enrico Sassoni, Marco Bovo, Claudio Mazzotti
C3 Symposium 2025
The paper investigates, through preliminary tests on mortar mixes, the possibility of substi-tuting a relevant percentage of cement with cattle manure ash for production of sustainable concretes.
Enhancing Ye’Elimite-Gypsum Hydration And Microstructure In Cementitious Systems Using Layered Double Hydroxides, Godwin I. Ogbuehi, Monday U. Okoronkwo
Enhancing Ye’Elimite-Gypsum Hydration And Microstructure In Cementitious Systems Using Layered Double Hydroxides, Godwin I. Ogbuehi, Monday U. Okoronkwo
C3 Symposium 2025
This study evaluates the effect of nano-CaAlNO₃ layered double hydroxide (CAN LDH) on the early-age hydration of ye’elimite–gypsum systems. CAN LDH was synthesized via co-precipitation and added at 0%, 2%, and 5% dosages to ye’elimite–gypsum pastes. Isothermal calorimetry showed that LDH addition accelerated hydration, while XRD analysis confirmed increased ettringite formation, particularly at 5 wt%. The improvements are attributed to the LDH’s high surface area, ion release, and nucleation capabilities. Results suggest that CAN LDH enhances hydration kinetics and microstructure development, making it a promising additive for CSA-based low-carbon binders.
Low-Carbon Supplementary Cementitious Materials (Scms) From Waste Stamp Sands, Xiang Zhao, Qingli Dai
Low-Carbon Supplementary Cementitious Materials (Scms) From Waste Stamp Sands, Xiang Zhao, Qingli Dai
C3 Symposium 2025
Addressing the critical challenge of reducing CO₂ emissions in the cement industry involves utilizing waste stamp sands as a sustainable source for supplementary cementitious materials (SCMs). Stamp sands, abundant in Michigan's Upper Peninsula, contain silicate minerals that can be converted into high-performance SCMs, enabling reductions in clinker usage and overall carbon emissions [1].Therefore, this study investigated the potential of waste stamp sands from Lake Superior (Gay, MI) as SCMs through calcination. Compositional analysis revealed that the sands contained silicate minerals such as albite, diopside, and anorthite, making them suitable for pozzolanic activity [2, 3]. Calcination at 800–900°C transformed these crystalline …
Advancing The Use Of Supplementary Cementitious Materials: A Novel Framework For Quantitative Reactivity Estimation, Bryan Aylas-Paredes, Rohan Bhat, Narayanan Neithalath, Aditya Kumar
Advancing The Use Of Supplementary Cementitious Materials: A Novel Framework For Quantitative Reactivity Estimation, Bryan Aylas-Paredes, Rohan Bhat, Narayanan Neithalath, Aditya Kumar
C3 Symposium 2025
The partial replacement of Portland cement (PC) with supplementary cementitious materials (SCMs) presents an effective strategy to reduce CO2 emissions associated with cement production while preserving essential mechanical properties and durability. SCMs, such as fly ash, blast furnace slag, calcined clays, and other aluminosilicate-rich materials, enhance sustainability through their pozzolanic and hydraulic reactivity. Despite their significant potential, the widespread adoption of SCMs has been limited by the absence of straightforward and quantitative methods to assess their reactivity‒a crucial property influenced by chemical composition, amorphous content, and particle fineness. To overcome these challenges, this study proposes a novel, simplified quantitative method …
Enhancing The Reactivity Of Steel Slag For High-Quality Scms, Laura Stefanini, Luke Hunter, K. H. C. Yap, Grace Gledden, Salvador Marval, Alex Dawes, Frederic Scott, Eliot Brooks, William J. Knapp
Enhancing The Reactivity Of Steel Slag For High-Quality Scms, Laura Stefanini, Luke Hunter, K. H. C. Yap, Grace Gledden, Salvador Marval, Alex Dawes, Frederic Scott, Eliot Brooks, William J. Knapp
C3 Symposium 2025
The transition towards more sustainable steelmaking methods, such as electric arc furnace (EAF) processes, is driving a significant increase in the production of electric arc furnace slag (EAFS). Unlike ground granulated blast furnace slag (GGBFS), a widely used by-product of traditional blast furnace-basic oxygen furnace (BF-BOF) processes, EAFS currently has limited applications, primarily as aggregate in concrete or asphalt, with large volumes landfilled. Efforts to utilise EAFS as a supplementary cementitious material (SCM) have shown mixed outcomes due to its low inherent reactivity and variability in properties. Our research focuses on developing a process to enhance the reactivity of EAFS …
Converting A Quarry Dust To A Potential Scm Through Calcination, Clark Lemon, P V P Moorthi, Zhihui Sun
Converting A Quarry Dust To A Potential Scm Through Calcination, Clark Lemon, P V P Moorthi, Zhihui Sun
C3 Symposium 2025
The present work dealt with a by-product from quarry industry named as “blue clay” that was typically not reused in the past. Preliminary research found that this blue clay has muscovite, a common component of raw clays, indicating a great potential for it to be used as a SCM. In this study, we calcined the blue clay under different temperatures. Raw and calcined blue clay at four different temperatures were investigated on the following properties: amorphous silica content, specific surface area, heat flow and reactivity. Results show that calcination improves the amorphous silica content of the system thereby enhanced the …
Autoclave Curing Of Cement Pastes With Sugarcane Bagasse Ash, Carolina Albuquerque Da Silva, Kejin Wang2, Dayana Cristina Silva Garcia
Autoclave Curing Of Cement Pastes With Sugarcane Bagasse Ash, Carolina Albuquerque Da Silva, Kejin Wang2, Dayana Cristina Silva Garcia
C3 Symposium 2025
This study proposes an alternative way of using sugar cane bagasse ash (SCBA) in cementitious materials by investigating the influence of autoclave curing on the microstructure of cement paste. Samples were prepared with 0%, 10%, 20%, 30%, 40%, and 50% SCBA as a replacement for cement. Two curing methods were used for the pastes: room temperature curing and autoclave curing. The results showed that the samples cured at room temperature showed similar microstructure development, while distinct hydration products formed under autoclave curing. Tobermorite and traces of xonotlite were detected in samples with high SCBA content, and traces of α-C2SH were …
Waste Eggshell Valorization As Limestone Alternative For Portland Cement, Beng Wei Chong, Pratik Gujar, Xijun Shi, Prannoy Suraneni
Waste Eggshell Valorization As Limestone Alternative For Portland Cement, Beng Wei Chong, Pratik Gujar, Xijun Shi, Prannoy Suraneni
C3 Symposium 2025
This study investigates and optimizes the heat treatment of eggshells to achieve performance comparable to that of limestone. Characterization of the eggshell powder revealed that it contained about 6% organic impurities by mass from the egg membrane. The effect of the organic content is not significant at 15% cement replacement. However, the influence of organic content imparted highly hydrophobic properties, which compromised paste flow, clinker hydration, and mortar strength at 35% cement replacement. Rheological measurement concluded that paste mixture with untreated eggshell powder displayed a higher static yield stress but lower dynamic yield stress. Moreover, mortars with untreated eggshell exhibited …
The Effectiveness Of Pumice As A Supplementary Cementitious Material In High Performance Self-Consolidating Concrete, Shashi S. Marikunte, Mitchel Anthony
The Effectiveness Of Pumice As A Supplementary Cementitious Material In High Performance Self-Consolidating Concrete, Shashi S. Marikunte, Mitchel Anthony
C3 Symposium 2025
The primary focus of the experimental research was to evaluate the effectiveness of pumice as a supplementary cementitious material to offset the cement’s carbon footprint within high performance Self-Consolidating Concrete. Two grades of supplementary cementitious material Pumice (Hess NCS-3 and Hess NDS325) were evaluated during the experimental testing, which were compared against Metakaolin and conventional SelfConsolidating Concrete. The experimental research focused on workability, 7-day, and 28-day compressive strength testing. Initial testing was conducted on 0%, 5%, 10%, and 15% replacement alternatives within each mix design to arrive at the optimum percentage of replacement with cement. The mixture proportion was further …
Study On Hydration Kinetics Of Geopolymer Synthesized With Recycled Concrete And Brick Powder, Tao Meng, Dawang Dai
Study On Hydration Kinetics Of Geopolymer Synthesized With Recycled Concrete And Brick Powder, Tao Meng, Dawang Dai
C3 Symposium 2025
Concrete and brick waste accounted for the majority of construction and demolition waste. In recent years, the use of recycled concrete powder (CP) and recycled brick powder (CP) to prepare geopolymer binders gained significant attention. This study investigated the hydration characteristics of geopolymer made from BP and CP using isothermal calorimetry and low-field nuclear magnetic resonance (1H NMR) techniques. The results showed that the incorporation of BP or CP reduced the heat release during geopolymer hydration. The degree of hydration of the geopolymer binder initially decreased and then increased as the addition of BP or CP increased, while the nucleation …
Ca/Si-Dependent Size Of Silica Nanoparticles Derived From C-S-H At High Water To Solid Ratio, Binmeng Chen, Zongjin Li
Ca/Si-Dependent Size Of Silica Nanoparticles Derived From C-S-H At High Water To Solid Ratio, Binmeng Chen, Zongjin Li
C3 Symposium 2025
In recycling and reusing construction waste, carbonation of recycled concrete fine (RCF) has been successfully applied to produce value-added products, such as silica nanoparticles, via the breaking of calcium silicate hydrate (C-S-H) structure and condensation of silicate chains. However, the intricacies of carbonation of RCFs with varying calcium-silicon (C/S) ratios and their implications on the size of generated silica nanoparticles remains unknown. In this work, we developed an optimized carbonation method at high water to solid ratio to fabricate silica nanoparticles from C-S-H with different C/S ratios. The particle size of silica nanoparticles was found to gradually decrease with the …
Microstructure Evolution Of Alite In-Situ Carbonated By Aminated Mesoporous Silica Nanoparticles, Yuyang Zhao, Binmeng Chen
Microstructure Evolution Of Alite In-Situ Carbonated By Aminated Mesoporous Silica Nanoparticles, Yuyang Zhao, Binmeng Chen
C3 Symposium 2025
Given that CO2 chamber and high inner pressure are needed in the traditional carbonation curing, we propose an in-situ internal carbonation by aminated mesoporous silica nanoparticles (MSNs) to tackle the challenge due to its high specific surface area. In this study, phase transformation and nucleation behavior were investigated by in-situ carbonation of alite paste with MSNs-amine absorbing CO2 (MSNs-amine-AC) and MSNs-amine desorbing CO2 (MSNs-amine-DC), separately. C-S-H with low Ca/Si ratio and negative electric potential is formed when MSNs-amine-DC is gradually eroded, wrapped and collapsed, converting to reaction sites chemically. On the contrary, ACC generated in MSNs-amine-AC blocks the mesopores, retard …
Molecular Dynamics And Machine Learning Approaches For Cementitious Material Design, Dongshuai Hou, Yue Zhang, Pan Wang, Muhan Wang, Xinpeng Wang
Molecular Dynamics And Machine Learning Approaches For Cementitious Material Design, Dongshuai Hou, Yue Zhang, Pan Wang, Muhan Wang, Xinpeng Wang
C3 Symposium 2025
The brittleness and cracking issues in concrete significantly compromise its structural safety and durability. This study combines molecular simulations and machine learning to address these challenges and enhance cementitious material performance. First-principles calculations, reactive force field, and classical molecular dynamics were employed to decode hydration mechanisms, mechanical properties, and interfacial behaviors, with the aid of a novel machine learning force field achieving near-DFT accuracy at reactive force field speeds. Concurrently, generative adversarial networks (GANs) were used to augment data for predicting concrete strength, enabling the development of high-accuracy machine learning models. These integrated approaches reveal fundamental mechanisms and establish predictive …
Application Of Nano Science And Nano Technology In Developing Advanced Cementitious Materials, Zongjin Li, Yunjian Li, Guoxing Sun, Binmeng Chen
Application Of Nano Science And Nano Technology In Developing Advanced Cementitious Materials, Zongjin Li, Yunjian Li, Guoxing Sun, Binmeng Chen
C3 Symposium 2025
No abstract provided.
Improvement Of Lithium-Metal Electrode All-Solid-State Batteries Performance By Shot Peening And Magnetron Sputtering, Atsuro Okumura, Manabu Kodama
Improvement Of Lithium-Metal Electrode All-Solid-State Batteries Performance By Shot Peening And Magnetron Sputtering, Atsuro Okumura, Manabu Kodama
15th International Conference on Shot Peening
To enable fast charging in lithium-metal anode all-solid-state batteries, suppressing lithium dendrite formation at the solid electrolyte (SE) interface is critical. Increasing fracture toughness via shot peening (SP) and improving interfacial contact with Au sputtering can inhibit dendrite growth. However, conventional sputtering may reduce toughness due to localized thermal damage. This study investigated magnetron sputtering as a low-damage, plasma-based Au deposition method. SEs with and without SP were fabricated and coated via normal and magnetron sputtering. Critical current density (CCD) and fracture toughness were evaluated. Without SP, CCD improvement was limited regardless of sputtering method due to poor bonding. With …
Hydrogen Embrittlement In Shot-Peened Steel, Jia-Huei Tien, David R. Johnson, David Bahr
Hydrogen Embrittlement In Shot-Peened Steel, Jia-Huei Tien, David R. Johnson, David Bahr
15th International Conference on Shot Peening
This work investigates the role of shot peening on hydrogen embrittlement resistance in quenched and tempered 1070 steel. Thermal desorption spectroscopy results revealed that shot-peened specimens contained nearly twice the hydrogen (H) content of unpeened samples when charged under the same electrochemical conditions, suggesting the introduction of additional trapping sites occur during peening. The mechanism underlying this behavior can be associated with increased dislocation density and is more consistent with the HELP mechanism. Residual stress measurements show a significant relaxation of compressive stresses in shot-peened specimen after H charging, indicating H enhanced dislocation rearrangement. Both unpeened and peened specimens exhibited …
Investigation Of Topography Changes Of Blasted Surfaces: An Experimental Perspective Using Fiducial Markers, Stefanie Stoeckel, Sophie Groeger
Investigation Of Topography Changes Of Blasted Surfaces: An Experimental Perspective Using Fiducial Markers, Stefanie Stoeckel, Sophie Groeger
15th International Conference on Shot Peening
Abrasive blasting is a process that intentionally modifies surface topography to meet specific functional requirements. The blast media is accelerated and interacts directly with the surface through impact. It is evident that the number of impacts and the overlap increase with time. This study aims to investigate these alterations to surface topography through repeated examinations of the same location. A methodology has been developed that employs the use of fiducial markers, which are protected during blasting by a custom 3D-printed cover. This method was used to observe changes in the topography of smooth and rough initial surfaces that had been …
Anisotropic Residual Stress Measurements In Additively Manufactured 316 Stainless Steel Parts, Rajeshree Varma, Donovan Stumpf, Paul R. Mort
Anisotropic Residual Stress Measurements In Additively Manufactured 316 Stainless Steel Parts, Rajeshree Varma, Donovan Stumpf, Paul R. Mort
15th International Conference on Shot Peening
Additive manufacturing (AM) using laser powder bed fusion (L-PBF) is increasingly used to produce complex parts for industries like aerospace and medical devices. The intrinsic characteristics of AM – layer-wise deposition and rapid thermal cycling – generate significant, anisotropic, residual stresses that can compromise part quality and performance. Recent studies highlight how these stresses are strongly influenced by process parameters and build orientation. X-ray diffraction (XRD) techniques, including sin²ψ and advanced two-dimensional approaches, have become the preferred methods for non-destructive, directionally resolved measurement of residual stress in AM metals. This review surveys advancements in XRD residual stress methods with a …
From Strain To Stress: Stress Map Testing Of Almen Strips, Donovan Stumpf, Rajeshree Varma, Paul R. Mort
From Strain To Stress: Stress Map Testing Of Almen Strips, Donovan Stumpf, Rajeshree Varma, Paul R. Mort
15th International Conference on Shot Peening
Almen strips have long been used to evaluate shot peening intensity, with arc height serving as a proxy for compressive residual stress. Stress mapping tests (SMT) in this work involve the controlled flattening of an Almen test strip onto a spatial pressure sensor, acting as an inferential measurement for the net bending moment caused by the relaxation of the peened strip. This work explores how stress mapping tests add insight into the stress state of Almen strips, potentially offering a fast and practical alternative to residual stress depth profiling. SMT data analysis provides a framework for relating Almen gauge height …
Fourier Analyses Of Optical Profilometry As An Inferential Measurement For Impact Coverage., Langdon Feltner, Paul Mort
Fourier Analyses Of Optical Profilometry As An Inferential Measurement For Impact Coverage., Langdon Feltner, Paul Mort
15th International Conference on Shot Peening
A critical consideration in peening process design is achieving sufficient impact coverage. Conventional methods for assessing coverage rely on manual inspection, which is time-consuming and poorly suited for automated control. In this work, we investigate the use of frequency-domain analysis to quantify surface modification in peened samples using optical profilometry (OP) data. Three-dimensional surface maps of Almen strips were acquired using a high-resolution OP system and analyzed via fast Fourier transform (FFT) to compute spatial power spectral densities (PSDs). PSD maps and radially averaged profiles reveal consistent amplification of harmonic components similar to the nominal particle size, with increasing intensity …