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Durability Assessment Of Low-Carbon Concretes Using Electrical Resistivity, Chloride Migration And Diffusion Modelling, Salim Malami, Dimitry Val, Benny Suryanto
Durability Assessment Of Low-Carbon Concretes Using Electrical Resistivity, Chloride Migration And Diffusion Modelling, Salim Malami, Dimitry Val, Benny Suryanto
International Conference on Durability of Concrete Structures
Durability design for reinforced concrete increasingly relies on performance-based indicators of transport processes that govern corrosion initiation. This study evaluates concretes with supplementary cementitious materials (SCMs) (fly ash (FA), ground-granulated blast-furnace slag (GGBS), limestone powder (LP), and limestone calcined clay cement (LC3)) using electrical resistivity and rapid chloride migration (RCM, NT Build 492) testing. Twelve mixes (w/b = 0.40 and 0.55), including binary and ternary binders benchmarked against Portland cement (PC), were tested. Resistivity was measured on cubes with embedded stainless-steel electrodes, whereas chloride diffusion coefficients were measured directly using the RCM method and compared with the values calculated from …
Durability Assessment Of Low-Carbon Concrete Using Electrical Resistivity And Derived Transport Parameters, Elo Merit Imitini, Benny Suryanto, Bhaskar Sen Gupta
Durability Assessment Of Low-Carbon Concrete Using Electrical Resistivity And Derived Transport Parameters, Elo Merit Imitini, Benny Suryanto, Bhaskar Sen Gupta
International Conference on Durability of Concrete Structures
Effective assessment of reinforced concrete durability necessitates monitoring of concrete performance using straightforward yet robust technique over an extended period of time. This study investigates six low-carbon concrete mixes incorporating up to 70% Portland cement replacement using binary and ternary combinations of ground granulated blast furnace slag (GGBS), fly ash (FA), and limestone powder (LP). Electrical resistivity measurements were undertaken over a 360-day period and used to derive formation factors and instantaneous diffusion coefficients, offering insight into the evolving pore structure and ionic transport. The results showed that all mixes exhibited a progressive increase in resistivity, indicative of continued hydration …
Aci Standards For Concrete Proportions, Qualification Testing And In-Process Testing During Construction, Nausherwan Hasan
Aci Standards For Concrete Proportions, Qualification Testing And In-Process Testing During Construction, Nausherwan Hasan
International Conference on Durability of Concrete Structures
This paper provides a summary of the American Concrete Institute (ACI) design standards concrete mixture proportions for various exposure conditions in USA. As defined by ACI 318, for each class of concrete and exposure condition, minimum water to cementitious ratio and compressive strength, are prescribed. The responsibility of selecting the concrete mixture proportions design rest with a Professional Engineer, licensed in the State where the construction is carried out. Trial batches of concrete are performed in accredited laboratory, in accordance with ACI 211.1, with adequate lead time to ensure that the test results are available, prior to construction. Attention is …
Corrosion Risk Of Rc Structures Against Combined Chloride Ingress And Carbonation Under Future Climate Projections, C.S. Das, M.R. Ahmad, P. Zhang, J-.G. Dai
Corrosion Risk Of Rc Structures Against Combined Chloride Ingress And Carbonation Under Future Climate Projections, C.S. Das, M.R. Ahmad, P. Zhang, J-.G. Dai
International Conference on Durability of Concrete Structures
The deterioration of reinforced concrete (RC) structures is primarily caused by the corrosion of reinforcement due to chloride ingress or carbonation, with temperature playing a significant role in this process. This study presents a multi-physics modeling framework that integrates mass transport, electrochemical reactions, and material damage to simulate corrosion in RC structures. The model utilises experimentally validated parameters, including temperature-dependent chloride transport rates and binding capacities, to achieve enhanced accuracy. It was applied to assess the corrosion risk of RC structures in Hong Kong under various climate scenarios. Results showed that while higher temperatures accelerate chloride transport, they also increase …
Drying Shrinkage Properties Of Fly Ash Concrete, Moorvi, Supratic Gupta, Meera
Drying Shrinkage Properties Of Fly Ash Concrete, Moorvi, Supratic Gupta, Meera
International Conference on Durability of Concrete Structures
Shrinkage of concrete is a prime aspect affecting the durability and long-term performance of structures. IS 456 specifies the minimum cement content required to control shrinkage, which is of utmost importance in high-strength concrete (M75, M60) and lower strength concrete (M30), to be 450 kg/m³. IS456 mentions that shrinkage testing should be conducted to assess the possible decrease in volume due to moisture loss since excessive shrinkage can lead to cracking and the loss of structural integrity. However, codal provision or requirement is mentioned in the code. The literature available about shrinkage with change with fly ash is extremely limited. …
Investigation Of Capillary Pressure Evolution And Early-Age Shrinkage In Concrete Using A High-Capacity Tensiometer, Armin Jamali, Joao Mendes, Brabha Nagaratnam, Michael Lim
Investigation Of Capillary Pressure Evolution And Early-Age Shrinkage In Concrete Using A High-Capacity Tensiometer, Armin Jamali, Joao Mendes, Brabha Nagaratnam, Michael Lim
International Conference on Durability of Concrete Structures
Shrinkage-induced cracking is a critical durability concern in concrete structures, particularly those with low volume-to-surface ratios, leading to increased maintenance costs and reduced service life. Early-age concrete is especially vulnerable to shrinkage cracking due to its limited strength development. Capillary pressure is a primary driver of early-age shrinkage; however, conventional measurement techniques are limited to pressures below 100 kPa and durations of approximately seven hours post-casting, restricting a comprehensive understanding of capillary pressure evolution and its correlation with shrinkage and cracking potential. This study utilises a novel high-capacity tensiometer (HCT) capable of measuring capillary pressures up to 2000 kPa, significantly …
Assessment Of Ggbs-Blended-Concrete Durability With Modified Water Permeability Method, Soumyaranjan Panda, Supratic Gupta, Saubhagya Kumar Panigrahi
Assessment Of Ggbs-Blended-Concrete Durability With Modified Water Permeability Method, Soumyaranjan Panda, Supratic Gupta, Saubhagya Kumar Panigrahi
International Conference on Durability of Concrete Structures
The construction industry is increasingly embracing sustainable materials to mitigate environmental concerns and reduce the carbon footprint of conventional practices. Concrete, a vital material in modern infrastructure, is valued for its versatility and durability. However, Ordinary Portland Cement (OPC), the primary binder in conventional concrete, presents significant environmental challenges, including high carbon dioxide emissions and substantial energy consumption. With an annual growth rate of 2.5%, cement production exacerbates these issues, necessitating sustainable alternatives. Ground granulated blast-furnace slag (GGBS), a byproduct of the iron industry, is a promising supplementary material. Its use reduces cement consumption, enhances sustainability, and promotes eco-friendly construction …
Relationship Between Water Contents And Electrical Conductivity In Concrete, Ki-Tae Park, Jaehwan Kim, Dong-Woo Seo, Sangki Park
Relationship Between Water Contents And Electrical Conductivity In Concrete, Ki-Tae Park, Jaehwan Kim, Dong-Woo Seo, Sangki Park
International Conference on Durability of Concrete Structures
This study investigates the relationship between moisture absorption and electrical conductivity in concrete, aiming to evaluate the feasibility of using electrical impedance as a non-destructive indicator of moisture transport behaviour. Concrete specimens with varying water-to-cement (w/c) ratios were prepared and conditioned for 150 days under controlled air-drying conditions. Moisture absorption tests were conducted in accordance with ASTM C1585-20, and both weight change and impedance were measured over time. Impedance data were collected across a wide frequency range (10 Hz to 1 MHz) using a two-point measurement configuration, and direct current (DC) electrical conductivity was derived through nonlinear regression analysis based …
Simple Probabilistic Method For Chloride Transport In Concrete, Jaehwan Kim, Sangki Park, Dong-Woo Seo, Ki-Tae Park, Joohyung Kim
Simple Probabilistic Method For Chloride Transport In Concrete, Jaehwan Kim, Sangki Park, Dong-Woo Seo, Ki-Tae Park, Joohyung Kim
International Conference on Durability of Concrete Structures
It is a well-known fact that reinforced concrete structures exposed to marine environments suffer from reinforcement corrosion due to chloride ingress, which degrades the performance of the structure. To address this issue, reinforced concrete structures are designed and constructed to have a service life of more than 100 years, but to ensure safety or durability, it is necessary to accurately predict the onset of reinforcement corrosion. Various prediction models have been developed for chloride transport in concrete, including physically based models, with Fick's 2nd law being the most commonly used empirically based model for chloride penetration in concrete. However, the …
Advancing Monitoring And Self-Sensing Capabilities Of Smart Asphalt Concrete Containing Conductive Carbon Nanofillers, Mingjun Xie, Leqing Lin, Yilin Yin, Linglin Xu, Kai Wu, Zhengwu Jiang
Advancing Monitoring And Self-Sensing Capabilities Of Smart Asphalt Concrete Containing Conductive Carbon Nanofillers, Mingjun Xie, Leqing Lin, Yilin Yin, Linglin Xu, Kai Wu, Zhengwu Jiang
International Conference on Durability of Concrete Structures
Conventional asphalt pavements can withstand the traffic loading and provide safe, comfortable driving conditions, however, the intelligent functionality on self-monitoring and damage detection is also required for the construction of intelligent transport systems. This study develops a self-sensing conductive asphalt concrete inspired by smart cement-based materials, which is capable of continuous, real-time monitoring of stress, strain, and damage, enabling structural health monitoring (SHM) of asphalt pavements. The self-sensing characteristics relies on the piezoresistive effects that the internal conductive network deforms and causes measurable changes in electrical resistance under mechanical loading. To achieve this, carbon nanomaterials, graphene nanoplates (GNPs) and multi-walled …
Internal Tendon Damage Monitoring Technology Of Prestressed Concrete Bridge Using Acoustic Emission Method, Dong-Woo Seo, Sangki Park, Jaehwan Kim, Ki-Tae Park
Internal Tendon Damage Monitoring Technology Of Prestressed Concrete Bridge Using Acoustic Emission Method, Dong-Woo Seo, Sangki Park, Jaehwan Kim, Ki-Tae Park
International Conference on Durability of Concrete Structures
Various non-destructive testing techniques are being applied for tendon maintenance and safety management of prestressed concrete (PSC) bridges, which became a social issue after the rupture of the external tension member of the Jeongneungcheon Viaduct in Seoul in 2016. Acoustic emission (AE) is one of the most effective non-destructive evaluation (NDE) methods for structural health monitoring (SHM) of large-scale infrastructure. It enables real-time monitoring of concrete cracks and damage to embedded rebar without causing structural failure. It is particularly suitable for detecting cracks in the tendons of PSC bridges. PSC bridges are structurally categorised into internal and external tendon systems …
Machine Learning Based Analysis Of Industrially Produced Concrete, Bassey Etim, Mzakwan Arab, Nabil El Mocayd, Mohammed Seaid, M Shadi Mohamed
Machine Learning Based Analysis Of Industrially Produced Concrete, Bassey Etim, Mzakwan Arab, Nabil El Mocayd, Mohammed Seaid, M Shadi Mohamed
International Conference on Durability of Concrete Structures
Machine learning (ML) has proven effective for predicting the compressive strength of laboratory-produced concrete, but industrially produced concrete exhibits greater variability and uncertainty, and remains less studied. This work analyses a dataset of 2,617 industrial concrete samples from a UK ready-mix supplier, spanning a full year of supply and demand. The study evaluates the impact of both mix proportions and categorical features—including cement type, admixture type, and mix specification—on model accuracy. A holistic model incorporating all curing ages outperforms single-age models, and the inclusion of categorical features, particularly mix specification, significantly enhances predictive performance. Five ML models were considered: CatBoost, …
An Architecture Ph-Unet-Mask Based On Multi-Task Joint Learning: Exploration In Real-Time Segmentation Of Concrete Corrosion, Xu Miao, Yuxi Zhao
An Architecture Ph-Unet-Mask Based On Multi-Task Joint Learning: Exploration In Real-Time Segmentation Of Concrete Corrosion, Xu Miao, Yuxi Zhao
International Conference on Durability of Concrete Structures
Pixel-level segmentation of corrosion-induced damage in underground reinforced concrete (RC) structures is crucial for structural health monitoring but remains challenging due to complex backgrounds and the need for real-time models suitable for on-site inspections. To address these limitations, this paper introduces PH-UNet-Mask, a lightweight multi-task deep learning architecture designed for robust damage segmentation in challenging underground environments. The proposed model integrates Haar wavelet downsampling (HWD) within its encoder to preserve crucial edge details and employs a Parallel Channel-Spatial Attention (PCSA) module to adaptively refine feature representation by explicitly modelling spatial-channel dependencies. A key innovation is a multi-task joint learning framework …
Machine-Learning Pci Forecasts For Concrete Pavements: Evidence From A Nigerian Airfield, Abubakar Ahmad Shehu, Mohamed Shadi Mohamed, Arab M. Zakwan, Jinhui Jiang
Machine-Learning Pci Forecasts For Concrete Pavements: Evidence From A Nigerian Airfield, Abubakar Ahmad Shehu, Mohamed Shadi Mohamed, Arab M. Zakwan, Jinhui Jiang
International Conference on Durability of Concrete Structures
This study develops data-driven Pavement Condition Index (PCI) forecasting for rigid (jointed concrete) airfields to support maintenance planning, risk mitigation, and lifecycle analysis. Traditional PCI surveys per ASTM D5340 are manual, time-consuming, and subjective, motivating machine-learning alternatives. Using panel-level observations, five models predict next-year PCI from readily available variables: prior-year PCI, annual aircraft traffic, temperature, and rainfall. The models include ordinary least squares (linear), ridge, lasso, random forest (RF), and a feedforward artificial neural network (ANN). All models performed well on held-out validation data; the ANN was best, achieving ��2 = 0.985, MSE = 0.286, MAE = 0.397, and RMSE …
Effect Of Using Recycled Returned Concrete Aggregate On The Strength And Durability Aspects Of Concrete, Saugat Humagain, Ashish Bista, Prabir Kumar Sarker
Effect Of Using Recycled Returned Concrete Aggregate On The Strength And Durability Aspects Of Concrete, Saugat Humagain, Ashish Bista, Prabir Kumar Sarker
International Conference on Durability of Concrete Structures
A considerable amount of concrete is returned from construction sites due to various reasons such as excess quantity remaining after casting, not meeting the site specifications and cancellation of orders. In this study, the hardened returned concrete was crushed and used as recycled aggregate to produce new concrete. However, due to young age and inadequate compaction, the properties crushed returned concrete aggregate (CRCA) are different from those of commonly used recycled aggregates obtained from construction and demolition wastes. CRCA was used as 50% and 100% replacements of natural coarse aggregate (NCA). The effect of CRCA was evaluated by workability, strengths, …
Towards The Use Of Quarry Wastes In Cementitious Composites For Sustainable Construction, Adrian Chajec
Towards The Use Of Quarry Wastes In Cementitious Composites For Sustainable Construction, Adrian Chajec
International Conference on Durability of Concrete Structures
This study explores the use of quarry waste powders as partial replacements for cement in concrete, aiming to improve the sustainability of construction materials. Three types of powders—granite (GP), limestone (LP), and quartz (QP)—were used to replace 20% of cement by mass in concrete mixes. The research evaluates the impact of these substitutions on fresh properties, mechanical performance, durability under sulphate attack, and overall environmental and economic efficiency. Experimental tests included slump flow, setting time, compressive strength at 28 and 90 days, and resistance to sulphate-induced mass and strength loss. Additionally, carbon dioxide emissions and material costs were calculated based …
Characterization Of Incinerator Bottom Ash Aggregate (Ibaa) From Four Scottish Incinerators, Mohammad Naser Norouzifar, Tom Dyer, Moray Newlands
Characterization Of Incinerator Bottom Ash Aggregate (Ibaa) From Four Scottish Incinerators, Mohammad Naser Norouzifar, Tom Dyer, Moray Newlands
International Conference on Durability of Concrete Structures
Incinerator Bottom Ash Aggregate (IBAA), produced as a by-product from Energy-from-Waste (EfW) facilities in Scotland, is gaining acceptance as a sustainable alternative for concrete applications. This shift is driven by Scotland’s forthcoming landfill ban, which encourages increased recycling and diversion of waste from landfill. This study presents a detailed characterization of IBAA, sourced from four Scottish incinerators across various particle size fractions. Physical testing showed that the coarse IBAA fractions (12–22 mm) meet BS EN 8500-2 for use in ready-mixed and precast non-structural concrete. Furthermore, Los Angeles abrasion values (36–42%) and flakiness indices (13–18%) lend themselves well to this type …
Co-Creation Of Sustainable Concrete For Harsh Environments, Seyedalireza Mohammadirad, Jenny Harmon O'Driscoll, Michael O'Shea, Eoghan Clifford, Páraic Ryan
Co-Creation Of Sustainable Concrete For Harsh Environments, Seyedalireza Mohammadirad, Jenny Harmon O'Driscoll, Michael O'Shea, Eoghan Clifford, Páraic Ryan
International Conference on Durability of Concrete Structures
The need to decarbonise construction has intensified interest in low-clinker, high-durability concretes for aggressive environments such as marine and water/wastewater infrastructure. This study presents a co-created research framework combining systematic literature review, stakeholder engagement, and performance-based experimental design to evaluate both conventional and emerging Supplementary cementitious materials (SCMs). SCM selection was guided by oxide composition (CaO/SiO₂, CaO/Al₂O₃), hydration kinetics, durability trends, and industry input. Meta-analyses of acid and sulphate resistance identified key compositional thresholds and performance anomalies, supporting the inclusion of biomass fuel ash (BFA) and limestone calcined clay cement alongside fly ash and GGBS. A standard industry mix (C32/40) …
Life Cycle Assessment Of Semi-Submerged Offshore Wind Turbines’ Foundation Materials: Concrete Versus Steel, Isabel C L Castellanos, Andrew Whyte, Stephen M. Urquhart
Life Cycle Assessment Of Semi-Submerged Offshore Wind Turbines’ Foundation Materials: Concrete Versus Steel, Isabel C L Castellanos, Andrew Whyte, Stephen M. Urquhart
International Conference on Durability of Concrete Structures
The offshore wind-generation energy sector in Australia has been growing steadily in lieu of non-renewable energy sources, towards addressing national calls for greenhouse gas emission reductions. However, the industry in Australia is still somewhat fledgling, hence localised studies on environmental impact are scarce. In this context, the work here analyses greenhouse gas emissions by comparing like-for-like steel versus concrete materials as the main components in the foundation element of an offshore wind turbine throughout its lifecycle, using an adapted Life Cycle Assessment (LCA) method. This paper details a cradle-to-cradle LCA of the two alternative specifications for semi-submerged foundations supporting a …
Impact Of Systematic Classification And Identification Of Treatment Methods Of Mine Tailings On Concrete Durability, Berika Ceren Cihan Yilmaz, Ceren Ince, Demetrios M. Cotsovos, Richard James Ball
Impact Of Systematic Classification And Identification Of Treatment Methods Of Mine Tailings On Concrete Durability, Berika Ceren Cihan Yilmaz, Ceren Ince, Demetrios M. Cotsovos, Richard James Ball
International Conference on Durability of Concrete Structures
The rapid increase in mine tailings generation poses significant environmental challenges, with current disposal methods often unsustainable and leading to catastrophic failures such as tailing pond collapses or toxic slurry spills, resulting in fatalities and severe environmental damage. The urgency for sustainable construction materials is clear, particularly as the global focus shifts toward net-zero emissions and circular economies. Concrete, a primary construction material, traditionally depends on natural resources, making it imperative to explore alternatives that reduce environmental impacts. Mine tailings, with their rich elemental and oxide composition, present a promising option for partial replacement in concrete. Despite this potential, the …
Recycled Coarse Aggregate From Large-Panel Demolitions In Self-Compacting Concrete: Performance And Sustainability, Seweryn Daniel Malazdrewicz
Recycled Coarse Aggregate From Large-Panel Demolitions In Self-Compacting Concrete: Performance And Sustainability, Seweryn Daniel Malazdrewicz
International Conference on Durability of Concrete Structures
Buildings constructed with large-panel technology (LPS) before 1990 are increasingly being demolished in Western Europe, and this trend is likely to expand into Central and Eastern Europe due to rising construction activity and limited development space. Despite their age, the concrete from these structures often retains good strength, making it a viable candidate for recycling. This study investigates the reuse of coarse recycled concrete aggregate (RCA) from demolished LPS panels in self-compacting concrete (SCC), a mix known for its high water demand and sensitivity to aggregate properties. The research evaluates whether RCA from LPS should be treated as a distinct …
Comparison Of Mechanical And Durability Properties Of Concretes Containing Copper Heap Leach Residue, S. Khair, F.U.A. Shaikh, P.K. Sarker
Comparison Of Mechanical And Durability Properties Of Concretes Containing Copper Heap Leach Residue, S. Khair, F.U.A. Shaikh, P.K. Sarker
International Conference on Durability of Concrete Structures
This paper presents comparative properties of concretes containing washed and un-washed copper heap leach residue (CHLR) as partial replacement of natural aggregates at 25 to 75%. The mechanical and durability properties of the concrete are evaluated with unwashed saturated surface dried (SSD) CHLR and these properties are compared with the 60 min rigorously washed-SSD CHLR concretes. The mechanical properties of control concrete containing natural aggregates showed 46.7 MPa of compressive strength, 3.61 MPa of indirect tensile strength, and 4.80 MPa of flexural strength at 28 days, while the durability properties of the specimen indicated 450 μɛ of drying shrinkage, 5.8% …
Enhancing The Pozzolanic Reactivity Of Bauxite Refinery Residue For Cementitious Applications Through Calcination Treatment, Pukar Siwakoti, Jaya Acharya Nepal, Salim Barbhuiya, Bamdad Ayati
Enhancing The Pozzolanic Reactivity Of Bauxite Refinery Residue For Cementitious Applications Through Calcination Treatment, Pukar Siwakoti, Jaya Acharya Nepal, Salim Barbhuiya, Bamdad Ayati
International Conference on Durability of Concrete Structures
Bauxite refinery residue (BRR), a byproduct of alumina production, has significant potential for applications in the construction industry due to its favourable chemical composition and abundant availability. However, its use as a supplementary cementitious material (SCM) is limited by its low pozzolanic reactivity. This study investigates the pozzolanic reactivity of BRR through both indirect and direct methods. BRR was used to replace Ordinary Portland Cement (OPC) at 5%, 10%, 15%, 20%, 25%, and 30% by weight. Mortar compressive strength was tested at 3, 7, and 28 days, while pozzolanic reactivity was directly assessed using the modified Chapelle test. BRR characterisation …
Utilising 'Filter Cake' For Low-Carbon Non-Structural Concrete: A Sustainable Approach To Waste Management, Feysal Shifa, Imrose B. Muhit, David J. Hughes, Thadsha Suntharalingam
Utilising 'Filter Cake' For Low-Carbon Non-Structural Concrete: A Sustainable Approach To Waste Management, Feysal Shifa, Imrose B. Muhit, David J. Hughes, Thadsha Suntharalingam
International Conference on Durability of Concrete Structures
Scott Bros (SB) Ltd.’s recycling plant for soil and aggregate washing is projected to generate 225,000 tonnes of residual waste material, known as 'filter cake,' annually. This high-volume, low-value waste stream presents significant management and disposal challenges. This study explores the potential of using 'filter cake' as a raw material in low-carbon non-structural (non-standard) concrete production, contributing to the circular economy. The research aimed to develop low-carbon concrete by maximising recycled ingredients and minimising CEM-I content. Concrete cube samples (150 mm) were prepared, cured, and tested according to BS 8500 and BS 12390 standards. The study investigated the 28-day compressive …
Ultra High Performance Concrete (Uhpc) Bridge Deck Overlays As A Corrosion Mitigation Strategy, Naveen Saladi
Ultra High Performance Concrete (Uhpc) Bridge Deck Overlays As A Corrosion Mitigation Strategy, Naveen Saladi
International Conference on Durability of Concrete Structures
Corrosion of steel reinforcement is one of the primary contributing factors to bridge deck deterioration. To extend the service life of a bridge deck, different corrosion mitigation strategies can be employed including overlays and corrosion mitigation chemicals. Traditionally, deteriorated bridge decks were repaired using localized patches or thin bonded overlays composed of conventional concrete materials. However, UHPC overlays gained traction from the bridge owners in recent years, in part due to their superior mechanical and durability properties. On the other hand, corrosion mitigation chemicals are added to the concrete surface to reduce ingress of deleterious ions and thereby reducing corrosion …
Structural Behaviour Of Preflex Beams In Bridges During Concrete Repair And Maintenance, Liam Simpson, Imrose Muhit
Structural Behaviour Of Preflex Beams In Bridges During Concrete Repair And Maintenance, Liam Simpson, Imrose Muhit
International Conference on Durability of Concrete Structures
Preflex beams are composite structural members that combine a steel universal beam with reinforced concrete, enabling longer spans with reduced deflection. Their strength and stiffness rely on a preflexion process, where the bottom flange is initially placed in tension and later compressed by the surrounding concrete. Despite their advantages, repairing preflex beams, particularly the bottom flange concrete, presents challenges due to its role in load distribution and deflection control. This study investigates the structural behaviour of preflex beams when the bottom flange concrete, an integral component of the load distribution mechanism, is altered during concrete repairs, addressing the need for …
Performance Optimisation And Field Application Research Of Emergency Repair Mortar In High-Cold And High-Altitude Areas, Tiejun Hou, Hao Jing, Chenchen Zhang, Shuxuan Bai, Yuan Yuan, Leqing Liu, Pengkun Hou
Performance Optimisation And Field Application Research Of Emergency Repair Mortar In High-Cold And High-Altitude Areas, Tiejun Hou, Hao Jing, Chenchen Zhang, Shuxuan Bai, Yuan Yuan, Leqing Liu, Pengkun Hou
International Conference on Durability of Concrete Structures
Qinghai Province is located in a high-cold and high-altitude area, with low average annual temperature, large daily temperature difference, strong ultraviolet irradiation, and arid climate with little rain in some places, which greatly exacerbates the deterioration of the material and structural performance, especially the frequent occurrence of earthquakes, mudslides, landslides, and other geologic hazards have also resulted in structural damage. However, common emergency repair materials have decreased strength at low temperatures and require complex maintenance conditions to harden, which increases the difficulty of repair. Based on the characteristics of high-cold and high-altitude areas, this study systematically investigated the working performance, …
Effect Of Backfills On The Corrosion Protection Performance Of Galvanic Anode In Rc Member, Hikaru Ikeda, Koichi Kobayashi, Motoki Onoda
Effect Of Backfills On The Corrosion Protection Performance Of Galvanic Anode In Rc Member, Hikaru Ikeda, Koichi Kobayashi, Motoki Onoda
International Conference on Durability of Concrete Structures
Galvanic anodes can supply corrosion protection current to steel by simply connecting them to steel in concrete and can prevent corrosion of steel for a long period. Furthermore, they are attracting interest because they do not require continuous monitoring nor other maintenance. Galvanic anodes are composed of a sacrificial metal, such as zinc, covered with backfills. The backfills contribute to a stable supply of corrosion protection current by maintaining the galvanic anode at a high alkaline level and by having high water retention. Their properties closely relate to the lifetime of the galvanic anode and its corrosion protection performance. Therefore, …
Use Fibre Optic Sensor Systems For Structural Integrity Monitoring In Ageing Sewer Concrete Structures And Pipelines, Matthas Fabian, Joanna Coote, Richard Harry Scott, Heriberto Bustamante, Tong Sun, Kenneth Thomas Victor Grattan
Use Fibre Optic Sensor Systems For Structural Integrity Monitoring In Ageing Sewer Concrete Structures And Pipelines, Matthas Fabian, Joanna Coote, Richard Harry Scott, Heriberto Bustamante, Tong Sun, Kenneth Thomas Victor Grattan
International Conference on Durability of Concrete Structures
Fibre Bragg Gratings (FBGs) form the basis of a valuable class of sensors that have a number of applications in industry and are formed as a periodic variation in the refractive index of an optical fibre that reflects light at a specific wavelength depending on the strain applied to the fibre – this effect can be related to and then calibrated against the parameter to be measured. A number of different types of sensors have been developed for monitoring sewer structures, detecting strain and potential leaks in sewer pipelines by embedding fibres along the pipeline route and for monitoring the …
Use Of A Bulk Resistivity Index To Evaluate The Permeability Performance Of Blended Cements And Scms, Robert Douglas Hooton
Use Of A Bulk Resistivity Index To Evaluate The Permeability Performance Of Blended Cements And Scms, Robert Douglas Hooton
International Conference on Durability of Concrete Structures
Most specifications for supplementary cementitious materials focus on reactivity as related to strength development. However, beyond strength, the other major benefit from use of SCMs, whether added separately or in blended cements, is their impact on changing the pore structure of the cementitious matrix resulting in improved resistance to ingress of aggressive fluids, i.e. lower permeability. ASTM C1876 and similar test methods in other standards for assessing the bulk resistivity of concrete already exist, but in 2025, ASTM subcommittee C09.48 on Performance of Cementitious Mixtures has adopted ASTM C1952, a standard test method for assessing the relative bulk resistivity of …