Review
Engineering, Environmental
Abdullah Anwar, Xuemei Liu, Lihai Zhang
Summary: Biogenic corrosion of concrete in wastewater systems is a global problem that causes extensive damage and costly maintenance. It is primarily caused by the colonization of sulfur-oxidizing bacteria on concrete surfaces, leading to the formation of sulfuric acid. Despite research efforts, a solution to this problem remains elusive.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Engineering, Mechanical
Jayson Pereira Godinho, Marcelo Henrique Farias de Medeiros
Summary: This study evaluated the degradation of a concrete structure in a sewage treatment plant in Curitiba, Brazil, finding severe corrosion of reinforcement but well-preserved mechanical properties with compressive strength even higher than previous inspections. The attack on concrete initiated on the surface and deepened over time due to decalcification of C-S-H, resulting in gypsum formation as the final product of the degradation mechanism.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Green & Sustainable Science & Technology
Bharathi Raju, R. Kumar, M. Senthilkumar, Riza Sulaiman, Nazri Kama, Samiappan Dhanalakshmi
Summary: Humidity is an important factor that enhances biogenic acidic corrosion in concrete structures of sewers. This study proposes an optical humidity sensor for deployment in harsh environments like sewer structures, which shows good sensitivity and other evaluation metrics.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Construction & Building Technology
Tom Damion, Piyush Chaunsali
Summary: Biogenic acid attack on concrete in sewers is a serious durability concern and field studies on this topic are limited. This study reports on the biogenic acid resistance of Portland cement (PC) and calcium sulfoaluminate (CSA) cement-based binders under in-situ sewer exposure. The results show that the CSA-based binder outperformed PC in terms of biogenic acid resistance, possibly due to the aluminum hydroxide phase for acid neutralization and bactericidal properties. The bacteriostatic effect of CSA cement was demonstrated for the first time through analysis of field exposed specimens.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Chemistry, Physical
Wei Yang, Pinghua Zhu, Hui Liu, Xinjie Wang, Wei Ge, Minqi Hua
Summary: High-calcium fly ash-based geopolymer concrete shows better performance in sulfuric acid corrosion, with a minimum neutralization depth of 6.9 mm, while the compressive strength of geopolymer concrete depends on the concentration of alkali OH ions.
Article
Construction & Building Technology
Sudha Uthaman, Vinita Vishwakarma
Summary: The superiority of concrete is influenced by factors such as quality, curing conditions, and exposure environment. Concrete deterioration is mainly caused by environmental factors and material limitations, which can be mitigated by the addition of supplementary cementitious materials and nanoparticles.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Domna Merachtsaki, Eirini-Chrysanthi Tsardaka, Eleftherios Anastasiou, Anastasios Zouboulis
Summary: This study evaluated the corrosion protection of combined magnesium oxide/magnesium hydroxide coatings on concrete substrates against biogenic sulfuric acid. The results showed that the coatings effectively protected the concrete from bio-corrosion, with good adhesion and progressive consumption confirmed. The coatings maintained alkaline pH levels and minimized gypsum formation, suggesting their potential as a protective measure for concrete against acid corrosion.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Civil
C. Van Steen, T. Van Beirendonck, R. Vrijdaghs, M. A. N. Hendriks, E. Verstrynge
Summary: This paper presents a two-phased numerical modeling approach to determine the constitutive behavior at the reinforcement-concrete interface under a certain corrosion level. The approach includes a crack model and a bond model, considering the flow of corrosion products, the effect of bonded length and concrete cover in the crack model, and using the resulting corrosion products expansion as input in the bond model. The combination of both models achieves a balance between computational time and modeling detail. The model is validated on experimental pull-out test results, showing good agreement in terms of crack width, crack pattern, corrosion-induced bond loss, and failure mode for different corrosion levels.
ENGINEERING STRUCTURES
(2023)
Article
Mathematics, Interdisciplinary Applications
Jie Xiao, Xiang Long, Long Li, Haibo Jiang, Yaowen Zhang, Wenjun Qu
Summary: This study investigated the influence of water/cement ratio, solution pH value, and aggregate chemical composition on the durability of concrete exposed to sulfuric acid through orthogonal experiments. The results showed that a higher water/cement ratio led to smaller mass loss and surface fractal dimension of specimens, while a lower pH value of the sulfuric acid solution resulted in greater mass loss and surface fractal dimension.
FRACTAL AND FRACTIONAL
(2021)
Article
Engineering, Mechanical
Haodan Pan, Donghao Li, Hongxiang Hu
Summary: Sulfuric acid pumps have failed multiple times in a chemical plant's nitrobenzene process due to mechanical seal failure. Through examination of the damage characteristics and corrosion effects, it was found that galvanic corrosion, particularly in the sealing gland in contact with the static ring seat, was the main cause of failure. Additionally, suggestions were provided to mitigate the corrosion.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Electrochemistry
Luca Casanova, Marcello La Padula, MariaPia Pedeferri, Maria Vittoria Diamanti, Marco Ormellese
Summary: This study investigates the influence of frequency and amount of cathodic polarization on the characteristics of oxide coatings during bipolar pulsed plasma electrolytic oxidation. By choosing high frequency and a specific negative-to-positive charge ratio, the growth of coatings optimized for corrosion resistance in concentrated sulfuric acid can be promoted; whereas low frequency and less cathodic polarization should be used to enhance localized corrosion resistance.
ELECTROCHIMICA ACTA
(2021)
Review
Chemistry, Physical
Ginneth Patricia Millan Ramirez, Hubert Bylinski, Maciej Niedostatkiewicz
Summary: This article introduces the main reasons for concrete deterioration, coating materials used for protection, and potential challenges in the production of eco-friendly coatings.
Article
Chemistry, Physical
Jianqiao Yu, Hongxia Qiao, Feifei Zhu, Xinke Wang
Summary: This study conducted 200 cycles of acid rain corrosion tests on fiber concrete, using steel fiber and basalt fiber volume dosing as variation parameters. The results showed that incorporating fibers can significantly improve the resistance to acid rain attack by reducing corrosion products and harmful pores, while optimizing the mean pore-size. Concrete with 2% steel fiber and 0.1% basalt fiber showed the least change in durability damage and had a predicted service life of 322 days.
Article
Chemistry, Physical
Domna Merachtsaki, Eirini-Chrysanthi Tsardaka, Eleftherios Anastasiou, Anastasios Zouboulis
Summary: The study focused on developing a magnesium hydroxide coating to protect concrete pipes from Microbiologically Induced Corrosion, with tests showing satisfactory anti-corrosion properties and adhesion ability, maintaining the concrete surface pH in the alkaline region during acid spraying tests.
Article
Construction & Building Technology
Ali Abu-Yosef, Stalin Armijos-Moya, Randall Poston
Summary: Biogenic sulfuric acid attack (BSA) is a biodegradation mechanism that leads to accelerated deterioration of concrete structures. There are currently no standards to evaluate the presence, extent, and severity of BSA in concrete. By evaluating the chemical and biological conditions in a digester, the study found that oxygen injection promotes BSA activity and accelerates concrete deterioration.
ACI MATERIALS JOURNAL
(2023)
Article
Entomology
Tatiana Lobo-Echeverri, Victor Manuel Galindo, Pilar Aubad, Adriana Ortiz-Reyes, Lina Maria Preciado, Mauricio Sanchez, James Jimenez, Olivier P. Thomas
INTERNATIONAL JOURNAL OF PEST MANAGEMENT
(2020)
Article
Engineering, Industrial
Oscar J. Ramirez Olivar, Santiago Zuluaga Mayorga, Felipe Munoz Giraldo, Mauricio Sanchez-Silva, Jean-Paul Pinelli, Ernesto Salzano
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2020)
Article
Multidisciplinary Sciences
Shiping Wei, Ce Guo, Lijuan Wang, Jiangfeng Xu, Hailiang Dong
Summary: The study demonstrates the green bacterial biosynthesis of PbS nanocrystallites using l-cysteine-desulfurizing bacterium, with the resulting nanocrystals being cubic in structure, about 105 nm in size, and composed of numerous nanoparticles with a diameter of 5-10 nm. Surface characterization shows that l-cysteine coats the surface of PbS nanoparticles as a stabilizing ligand. Optical analysis reveals a blue shift in the band gap energy of the bacterial PbS particles compared to naturally occurring bulk PbS, indicating a quantum size effect.
SCIENTIFIC REPORTS
(2021)
Article
Biotechnology & Applied Microbiology
Xueyan Yao, Zhenying Zhang, Jun Huang, Shiping Wei, Xianyun Sun, Yihua Chen, Hongwei Liu, Shaojie Li
Summary: This study revealed that candicidin-like secondary metabolites produced by microbial cells in natural soil environments can effectively control soilborne fungal diseases, providing a novel mechanism for microbial biocontrol agents. It was demonstrated that the main antifungal activity and biocontrol activity of Streptomyces albidoflavus strain W68 are due to the production of candicidin isomers, suggesting that gene clusters for candicidin-like compound biosynthesis could be used as molecular markers for screening and breeding microbial strains for biocontrol agent development.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Rafael Amaya-Gomez, Emilio Bastidas-Arteaga, Felipe Munoz, Mauricio Sanchez-Silva
Summary: Underground pipelines are affected by surrounding soil properties and protection measures, with corrosion being a major threat. By utilizing categorical measurements and defect depth measurements, it is possible to characterize the soil and propose adequate protective measures to prevent leakage. The study shows that more severe defects are likely to be located in poorly drained soils with high acidity.
Article
Biotechnology & Applied Microbiology
Shiping Wei, Mingxue Sun
Summary: It was found that the fungus Trichoderma asperellum BDH65 can transform calcite into an organic mineral earlandite, forming irregularly granular accumulations of micro globular particles. The mineral phase of the fungal catalyzed crystals is identified as earlandite, which is chemically identical to calcium citrate tetrahydrate. The structure and properties of the fungal formed crystals show similarities with those observed for chemically synthesized calcium citrate tetrahydrate, providing insights into bioweathering of minerals and rocks driven by fungi.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2021)
Article
Engineering, Industrial
Samuel Torres-Rincon, Mauricio Sanchez-Silva, Emilio Bastidas-Arteaga
Summary: Modern infrastructure network systems require key attributes such as flexibility, changeability, and adaptability to cope with uncertainties. Determining the value of flexibility, the cost of introducing it, and the relationship between flexibility and life-cycle costs are essential considerations in the design of flexible systems.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2021)
Article
Engineering, Industrial
Rafael Amaya-Gomez, Franck Schoefs, Mauricio Sanchez-Silva, Felipe Munoz, Emilio Bastidas-Arteaga
Summary: This paper investigates the matching problem in onshore pipeline in-line inspections and proposes an alternative method using Voronoi cells and iterative approach to determine the best affine transformation. Experimental results provide insights into the probability of detection and false alarm.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2022)
Article
Engineering, Civil
Nayled Acuna-Coll, Mauricio Sanchez-Silva
Summary: Infrastructure systems face demands from extreme natural events and socioeconomic pressures. Traditional design and management often fail to meet stakeholder expectations. This paper proposes a conceptual framework that combines systems thinking and flexibility to enable infrastructure systems to respond and change over time.
INNOVATIVE INFRASTRUCTURE SOLUTIONS
(2023)
Article
Geochemistry & Geophysics
Peilin Ye, Feirong Xiao, Shiping Wei
Summary: Microbially induced calcium carbonate precipitation (MICP) by urease-producing fungi has potential applications in harsh environments. In this study, carbonate minerals induced by urease-producing fungi isolated from marine sediments were investigated. The results show that the induced precipitates are composed of calcite and vaterite, with vaterite being thermodynamically unstable and easily decomposing at lower temperatures. The findings provide insights into the mineralization mechanism of urease-producing fungi and their potential applications in environmental engineering.
Article
Microbiology
Yu Gao, Han Zhu, Jun Wang, Zongze Shao, Shiping Wei, Ruicheng Wang, Ruolin Cheng, Lijing Jiang
Summary: In this study, a novel Thiomicrorhabdus strain XGS-01(T) was isolated from coastal sediment, showing sulfur-oxidizing and obligate chemolithoautotrophic characteristics. The strain was able to produce extracellular sulfur during thiosulfate oxidation, and genomic analysis revealed conserved metabolic pathways for carbon fixation among Thiomicrorhabdus species.
Article
Social Work
Eduardo Bustos, Mauricio Sanchez-Aliaga
Summary: This article examines child labour intervention from a governmental perspective in the Commune of Valparaiso, Chile. The study criticizes the intervention model designed by institutional mechanisms and emphasizes the need to reinterpret practices based on affective approaches. It also highlights the subjectivisation processes of working children and adolescents and the tensions within intervention processes. Evaluation: 7/10
ALTERNATIVAS. CUADERNOS DE TRABAJO SOCIAL
(2023)
Article
Management
Mauricio Sanchez-Silva
Summary: Infrastructure design and management are usually based on strong assumptions about future demands and performance. The success of real projects depends on assertive stakeholders' decisions that better accommodate changes in demand and system properties as they evolve with time. Incorporating flexibility and adaptability in infrastructure design and management can have a significant impact on costs and open new possibilities for better management.
INFRASTRUCTURE ASSET MANAGEMENT
(2021)
Article
Architecture
Mauricio Esteban Vico Sanchez, Ruben Jacob Dazarola, Juan Carlos Lepe Munoz, Mauricio Tapia Reyes
