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Article
Chemistry, Multidisciplinary
Alexey N. Beskopylny et al.
Summary: The alternating impact of wetting and drying on concrete and reinforced concrete structures is a dangerous cyclic effect. The resistance of variotropic concretes to wetting and drying has not been widely studied. Acidic medium has the most negative effect on concrete strength, while vibrocentrifuged concrete is the most resistant to aggressive environments and wetting-drying cycles.
APPLIED SCIENCES-BASEL
(2023)
Review
Chemistry, Multidisciplinary
Joseph Onah Ukpata et al.
Summary: Corrosion of steel reinforcement due to chloride attack is a significant concern for the durability of reinforced concrete. This paper reviews the binding of chlorides in Portland cement concrete, considering the impact of sulphates found in seawater. It also explores the use of supplementary cementitious materials and their effects on the phase assemblage, microstructure, chloride binding, and transport properties in concrete.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Composites
Alexey N. Beskopylny et al.
Summary: The aim of this study is to investigate the effect of heavy concrete manufacturing technology on the resistance of concrete to alternate freezing and thawing in an aggressive environment. The results showed that centrifuged and vibrocentrifuged variotropic concrete have greater resistance and endurance to cycles of alternate freezing and thawing compared to vibrated concrete.
JOURNAL OF COMPOSITES SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Evgenii M. Shcherban' et al.
Summary: The concrete of buildings and structures is increasingly at risk from aggressive pollutants. Technological methods for modifying concrete structure properties are promising as additional actions to counteract this risk. One effective solution is the use of centrifuged and vibrocentrifuged concrete with a variotropic structure. The aim of this study was to investigate the physical and mechanical properties of variotropic concretes when exposed to sulfate attack. The results showed that vibrocentrifuged concrete had the smallest mass loss, lowest strength reduction, and least sulfate attack compared to centrifuged and vibrated concrete.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Multidisciplinary
Xiaoping Zhong et al.
Summary: To study the deterioration of stirrup-corroded concrete columns under load and chloride, accelerated corrosion and load carrying capacity tests were conducted. The results showed that corrosion-induced cracks mainly developed along the longitudinal reinforcing steel bars and had little effect on the corroded stirrups. The stiffness and ultimate bearing capacity of the column decreased with the increase in stirrup corrosion rate.
APPLIED SCIENCES-BASEL
(2023)
Article
Construction & Building Technology
Xiaoyan Liu et al.
Summary: This study used nano-silica (NS) to enhance the chloride corrosion resistance of mortar samples made with recycled concrete powder (RCP). The addition of 2% NS significantly reduced the diffusion coefficient, electric flux, and corrosion rate of internal rebar. Furthermore, it also slowed down the increase in free chloride ion concentration and surface chloride ion concentration.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Weihong Chen et al.
Summary: This article evaluates the resistance of a proposed innovative self-healing concrete to chloride ion corrosion. Experimental results demonstrate that the self-healing concrete exhibits better resistance to chloride ion corrosion compared to traditional marine concrete.
Article
Construction & Building Technology
Boutros El Hajj et al.
Summary: The objective of this paper is to propose tools for infrastructure lifecycle management by showing the degradation processes and utilizing inspection data, specifically non-destructive testing (NDT) and structural health monitoring (SHM). These processes are multiphasic and can be divided into different phases with specific maintenance actions and measurement techniques. The proposed degradation meta-modelling approach, based on state-dependent stochastic processes, is used to model the degradation and maintenance of reinforced concrete structures affected by chloride-induced deterioration. The benefits of using multiphasic degradation meta-models in infrastructure lifecycle management are demonstrated through numerical examples with different management policies.
Review
Chemistry, Physical
Kevin Paolo V. Robles et al.
Summary: This study reviews and evaluates the application of electrical resistivity as a nondestructive technique for assessing chloride-induced deterioration in reinforced concrete. It discusses measurement techniques, correlation analysis, environmental factors, and addresses gaps in knowledge for future research.
Article
Green & Sustainable Science & Technology
Mahmood Hunar Dheyaaldin et al.
Summary: This study investigates the simultaneous effect of nano-silica and nano-alumina with and without polypropylene fiber on the chemical-resistant of alkali-activator mortar (AAM) exposed to acid, sulfate, and chloride attacks. The addition of both nanomaterials improved the mechanical properties and chemical resistance of the AAM, with the best results achieved using 2% nano-alumina and 1% polypropylene fiber.
Article
Chemistry, Multidisciplinary
Kwang-Myong Lee et al.
Summary: Concrete structures can suffer from steel reinforcement corrosion due to chloride exposure. A cyclic drying-wetting test using saltwater was conducted to accelerate steel corrosion in reinforced concrete (RC) members. The open-circuit potential (OCP) was measured and its relationship with chloride concentration, water-to-cement (w/c) ratio, and cover depth was evaluated. Results showed a linear relationship between OCP and cover depth, which was more prominent with higher chloride concentration and longer exposure time.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Civil
Mahmoud Elsayed et al.
Summary: This research investigates the structural behaviour of crumb rubber concrete short columns under different exposure conditions through experimental study. The results show that the addition of crumb rubber adversely affects the mechanical properties and durability of the concrete. The strength, stiffness, and toughness of the columns decrease with the increase in crumb rubber content and immersion time.
Article
Chemistry, Physical
Alexey N. Beskopylny et al.
Summary: Currently, in civil engineering, the focus is on minimizing the cost and improving the efficiency of manufacturing and construction of hollow structures. This study aims to theoretically and experimentally explore the potential of using vibrocentrifugation technology and ground granulated blast-furnace slag to create improved variotropic structures of concrete. Various methods were used, including electron microscopy, laser granulometry, and X-ray diffraction, to analyze the composition, macrostructure, microstructure, and final properties of the modified concrete. The optimal dosage of slag was determined to be 40%, resulting in an increase in strength indicators by 16% to 27% and density by 3%.
Article
Polymer Science
Alexey N. Beskopylny et al.
Summary: One disadvantage of reinforced concrete is its heavy weight. This study investigates the use of polymer composite reinforcement and variotropic building elements as alternatives. Numerical models were developed to analyze short bending concrete elements with polymer composite rods. It was found that carbon composite reinforcement has advantages over glass or basalt composite, providing greater bearing capacity. The study also observed a clear redistribution of stresses in favor of variotropic cross sections.
Article
Construction & Building Technology
Alexey Beskopylny et al.
Summary: The usage of nano modifying additives for developing new building materials is an important scientific problem. This study investigates the effect of a nano modifying additive on the structure of heavy concrete during vibrocentrifugation. It was found that adding 10% micro-silica to concrete resulted in the highest compressive and tensile strengths, as well as the smallest strains. Graphical dependencies of concrete properties on its composition were obtained.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Biochemistry & Molecular Biology
William Valencia-Saavedra et al.
Summary: Hybrid alkali-activated cements are alternative cements that combine the advantages of ordinary Portland cement and alkali-activated systems. This article evaluates the corrosion performance of reinforced HAAC concrete based on fly ash under exposure to chlorides, comparing it with a binary alkali-activated cement based on fly ash and granulated blast furnace slag. The tests show that the HAAC concrete exhibits better corrosion performance, with a lower corrosion rate compared to the binary cement.
Article
Chemistry, Physical
Jae-Min Lee et al.
Summary: This study proposes a coupled transport model to investigate the influence of cyclic exposure condition on chloride penetration in concrete. The simulation and verification results show that the rate of chloride penetration increases with decreasing ambient humidity levels.
Article
Chemistry, Physical
Guixiang Chen et al.
Summary: This research developed a corrosion-fatigue life prediction model for prestressed concrete beams, considering the coupled effect of the chloride attack environment and train load. The study found that train frequency, chloride attack environment grade, and environment temperature have a significant impact on the corrosion-fatigue life of the beams.
Article
Construction & Building Technology
Yingzi Zhang et al.
Summary: The study demonstrates that the addition of graphene can significantly enhance the compressive strength and chloride ion resistance of concrete, providing better durability in a marine environment.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Fengkun Cui et al.
Summary: This study proposed a time-dependent deterioration model for reinforced concrete columns subjected to the combined action of freeze-thaw cycles and chloride-induced corrosion. The research conducted a time-dependent seismic fragility analysis framework for aging RC columns considering the involved uncertainties, and obtained time-dependent seismic fragility curves under different service time points.
Article
Construction & Building Technology
Xiaofei Liang et al.
Summary: This study investigates the effect of nano-attapulgite clay (NAC) on the durability of concrete. The results show that NAC can improve the compressive strength and resistivity of concrete, while reducing the chloride diffusion coefficient, thereby enhancing the durability of concrete.
Article
Polymer Science
Alexey N. Beskopylny et al.
Summary: This article investigates the fundamental knowledge of cement gel formation for new generation concretes, with a focus on the differences in structure between standard vibrated concrete and centrifugally compacted concrete. The study explores the impact of different compaction techniques, such as vibration and centrifugation, on the gel formation process. Through experimental and theoretical analysis, the researchers describe the main physical and chemical processes involved in gel formation and establish the significant influence of technology on this process. The results show that centrifuged and vibrocentrifuged samples demonstrate improved indicators compared to vibrated ones, particularly in terms of strength and rheological characteristics.
Article
Construction & Building Technology
Enrico Zacchei et al.
Summary: This study proposes different scenarios for the influence of corrosion initiation time and chloride diffusion coefficient on loadings, and conducts stochastic analyses and numerical simulations. The results show that temperature and oscillations of functions have significant impacts on chloride diffusion, and the analyses considering random variability yield higher chloride content compared to traditional approaches.
Article
Chemistry, Physical
Congtao Sun et al.
Summary: This study investigated the anti-corrosion performance of commercial amino alcohol migratory corrosion inhibitors (MCIs) on concrete that underwent varying degrees of chloride erosion. The results showed that coating the steel bars with MCIs significantly improved their corrosion resistance in concrete, with earlier application resulting in higher anti-corrosion efficiency. This improvement was attributed to the protective film formed by the MCIs on the steel bar surfaces, which effectively inhibited the oxidative dissolution of iron.
Review
Materials Science, Multidisciplinary
Ganesh Naidu Gopu et al.
Summary: In the last few decades, corrosion study of conventional reinforcement in concrete has been given wider importance due to the losses occurring in monitoring concrete structures. The presence of chloride ions is known to be one of the significant factors contributing to the corrosion of reinforcing steel. Steel fibers and glass fibers have been found to have less impact on cracked sections in a chloride environment and can resist chloride infiltration.
Article
Construction & Building Technology
Enrico Zacchei et al.
Summary: The attack of chloride ions is a crucial factor affecting the durability of reinforced concrete. Traditional research methods have limitations in estimating chloride concentration and structural lifetime accurately. This paper proposes a multifactorial and multiphase model that considers multiple factors and incorporates time in the modeling.
Article
Construction & Building Technology
Jean De'M Malan et al.
Summary: The interlayer bond strength and durability properties of 3D printed concrete are found to be inferior to those of cast concrete, with a greater impact from the pass time. Cast samples have randomly distributed compact voids, while printed samples have interconnected pores in the interlayer regions. The results emphasize the importance of improving the interlayer bond in 3DCP.
Article
Chemistry, Physical
Xiaoqiang Qi et al.
Summary: The study improved the preparation method of graphene to achieve a highly dispersible TiO2-RGO, which showed better dispersion and performance compared to GO. TiO2-RGO cement mortars exhibited better strength and durability than GO cement mortars.
Article
Chemistry, Physical
Yang Luo et al.
Summary: The presence of sulphate inhibits chloride diffusion in early stage erosion, but may lead to cracking and reduced alkalinity, increasing the risk of steel corrosion. Fibre can enhance concrete's resistance to chloride attack and reduce the adverse effects of sulphate erosion over time.
Article
Chemistry, Physical
Yao Yu et al.
Summary: The study revealed that as the content of recycled brick-concrete aggregate increased, the mechanical properties and freeze-thaw resistance of concrete gradually decreased; a replacement level of 15% fly ash resulted in significant enhancements in compressive strength and resistance to freeze-thaw and chloride attack; using 30% fly ash by weight notably improved the resistance to chloride ion penetration due to the lowest water-soluble chloride content.
Article
Chemistry, Physical
Mauricio Arreola-Sanchez et al.
Summary: This study compared six index properties collected during durability inspections of five Mexican seaports, finding that electrical resistivity is a key durability index for concrete structures in marine environments. Additionally, the study verified the feasibility of using correlations of variables to clean unnecessary data for calculating corrosion initiation time.
Article
Chemistry, Physical
Danyang Su et al.
Summary: By corroding ordinary concrete (OC) and rubber concrete (RC) with different rubber contents using a NaCl solution, it was found that incorporating rubber can increase the compressive strength of concrete and reduce deterioration in chloride salt environments. The optimal rubber content was determined as 10% in the dry-wet alternation mechanism.
Article
Construction & Building Technology
Bing Feng et al.
Summary: This paper experimentally examines the compressive response of hollow section, centrifugal concrete-filled GFRP tube (HS-CFGT) members, proposes new design equations, and compares them with current design specifications. New coefficients reflecting initial eccentricity and confinement are determined, aiming to improve the accuracy of predicting compressive capacity for the proposed HS-CFGT columns.
Article
Construction & Building Technology
Cao Wang
Summary: This study presents a closed-form approach for durability assessment of RC structures, considering the spatial distribution of corrosion-related structural properties. The proposed method was validated through the assessment of a tunnel segment used in the Hong Kong-Zhuhai-Macau bridge project, demonstrating its applicability and accuracy.
Article
Chemistry, Multidisciplinary
Romualdas Kliukas et al.
APPLIED SCIENCES-BASEL
(2020)
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Construction & Building Technology
Anis Ghanei et al.
CONSTRUCTION AND BUILDING MATERIALS
(2020)
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Construction & Building Technology
Matthew S. Sullivan et al.
Article
Construction & Building Technology
Mahsa Farzad et al.
Article
Engineering, Multidisciplinary
Vahid Afroughsabet et al.
COMPOSITES PART B-ENGINEERING
(2018)
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Saeid Ghorbani et al.
CONSTRUCTION AND BUILDING MATERIALS
(2018)
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M. Pradeep Kumar et al.
CONSTRUCTION AND BUILDING MATERIALS
(2018)
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Mandi Valipour et al.
CONSTRUCTION AND BUILDING MATERIALS
(2013)