Long-term durability investigation of basalt fiber-reinforced geopolymer concrete in marine environment

Journal of Materials Research and Technology, Год журнала: 2024, Номер 31, С. 593 - 605

Опубликована: Июнь 13, 2024

The long-term durability of basalt fiber-reinforced geopolymer concrete (BFRGC) in marine environments is importance for the development sustainable construction practices. This study examines exposed to dry-wet cycles and immersion treatment conditions. A with 1% fiber content was prepared subjected treatments a 5% sulfate solution (Tehmina et al., 2014; Nasir 2016; John 2016) [1-3]. Density measurements, ultrasonic pulse velocity tests, uniaxial compression tests were conducted on BFRGC after various durations. mechanical properties compared without fibers environments. Additionally, changes compressive strength different further discussed. Using low-field nuclear magnetic resonance (LF-NMR) technology, variations pore structure also analyzed. results show that property loss from greater than treatment. In BFRGC, decreased by 10.1% 192 days cycles, smaller decrease 5.6% inclusion effectively enhances stability. When cycle 49.6 MPa 44.6 MPa, reduction 10.1%. Conversely, dropped 49.7 42.1 15.5%. LF-NMR test porosity increased 21.6% 17.5% environments, respectively. contrast, 16.1% 12.7%.

Язык: Английский

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Evaluating the impact of nano-silica particle size on pozzolanic reaction kinetics, mechanical strength and durability of portland slag cement

Construction and Building Materials, Год журнала: 2025, Номер 472, С. 140784 - 140784

Опубликована: Март 17, 2025

Язык: Английский

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Hydration behavior and chloride binding of seawater-mixed sintered sludge cement paste: Experimental and thermodynamic study

Construction and Building Materials, Год журнала: 2024, Номер 426, С. 136170 - 136170

Опубликована: Апрель 10, 2024

Язык: Английский

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Influence of Multi-walled Carbon Nanotube (MWCNT) on flexural behavior and microstructure characteristics of geopolymer concrete beams

Case Studies in Construction Materials, Год журнала: 2024, Номер 20, С. e03317 - e03317

Опубликована: Май 24, 2024

This experimental study delves into the impact of Multi-Walled Carbon Nanotubes (MWCNTs) on Geopolymer Concrete (GPC), investigating their effect compressive strength and load deflection behaviour. MWCNT concentrations ranging from 0.02% to 0.16% were employed examine influence structural performance 1500 mm (L) x 150 (B) (D) concrete beams. The findings derived this investigation yielded several significant conclusions. outcome research identified optimum dosage for enhancing at 0.12%, resulting in a substantial 29.78 MPa. However, surpassing concentration led decline strength. Notably, remarkable 26.62% increase was observed with 0.12% when compared reference specimens. In analysing performance, it that energy absorption capacity (EAC) exhibited consistent behavior up 0.6% addition MWCNT. At inclusion, EAC GPC reached its peak value 6116 kN.mm. Stiffness maintenance mirrored trends 0.1% MWCNT, beyond which decrease stiffness noted higher concentrations. Furthermore, Density Index (DI) beams sustained after DI began increase. Flexural Toughness Factor (FTF) retained 0.06%. declined flexural Additionally, Scanning Electron Microscopy (SEM) images revealed denser internal structure optimal Subsequent additions increased agglomeration, potentially hampering effective interaction between binder, activator within matrix. These contribute obtain optimised superior applications.

Язык: Английский

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A review on the potential application of ultra-high performance concrete in offshore wind towers: insights into material properties, mechanisms, and models

Thin-Walled Structures, Год журнала: 2024, Номер unknown, С. 112717 - 112717

Опубликована: Ноя. 1, 2024

Язык: Английский

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Enhanced bioelectrochemical degradation of Thiabendazole using biostimulated Tunisian hypersaline sediments: kinetics, efficiency, and microbial community shifts

Frontiers in Microbiology, Год журнала: 2025, Номер 15

Опубликована: Янв. 6, 2025

Thiabendazole (TBZ), a recalcitrant fungicide, is frequently applied in postharvest fruit treatment and generates significant volumes of industrial wastewater (WW) that conventional plants cannot handle. This explores bioelectrochemical system (BES) for TBZ degradation using Tunisian hypersaline sediments (THSs) as inoculum. Four sets BES, along with biological controls, were tested THS subjected to different levels biostimulation. Sediments underwent one, two, or three biostimulation phases increasing concentrations (0, 10, 100, 300 mg kg-1). Potentiostatic control was polarized at 0.1 V vs. saturated calomel reference electrode (SCE), carbon felt working (72 cm2 L-1) maintained 25°C. While current production very low, biostimulated 100 kg-1 kg produced the highest density (3.2 mA m-2), 5-fold increase over untreated (0.6 m-2). GC-FID analysis showed >99% all reactors. The half-elimination time from 27 days treatments 19 BES further 6 following Bacterial revealed substantial microbial community shift after biostimulation, reduction Bacillota (-64%) an Proteobacteria (+62%), dominated by Pseudomonas (45%) Marinobacter (16%). These findings provide insight into selective potential cycles enhance composition improve performance treatment.

Язык: Английский

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Understanding erosion resistance mechanisms of sodium aluminate silicate hydrate in erosion environments: a molecular dynamics study

RSC Advances, Год журнала: 2024, Номер 14(15), С. 10397 - 10408

Опубликована: Янв. 1, 2024

Sodium-aluminate-silicate-hydrate (NASH) gel, as the primary reaction product stimulated by alkali in silica-aluminum-rich minerals, influences mechanical and durability properties of geopolymers.

Язык: Английский

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Service life evaluation of marine concrete structures considering spatial and temporal characteristics: A framework based on multi training-MCS-NLS

Engineering Structures, Год журнала: 2024, Номер 322, С. 119193 - 119193

Опубликована: Окт. 30, 2024

Язык: Английский

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Waterborne epoxy coating with excellent barrier and self-healing properties for long-term corrosion protection

International Journal of Electrochemical Science, Год журнала: 2024, Номер 19(3), С. 100486 - 100486

Опубликована: Янв. 24, 2024

Herein, an intelligent anticorrosive coating with superior barrier and self-healing properties was prepared. Molybdate (MoO42−) intercalated layered double hydroxide (MIH) synthesised polydopamine (PDA) shell grown on MIH surface to prepare MIH@PDA (PMIH) material. PMIH assembled graphene (Gr) sheet through π–π interaction obtain the Gr@PMIH composite. The prepared by incorporating into epoxy resin. material demonstrated a stimulus-response capacity due solubility of in acidic conditions. In addition, ion-exchange (LDH) facilitated release encapsulated molybdate corrosion inhibitor between LDH layers adsorption chloride ions. This mechanism corroborated ultraviolet–visible (UV–vis) spectroscopy results. Electrochemical impedance (EIS) results revealed that incorporation materials considerably enhanced low-frequency (0.01 Hz) modulus. Among tested ratios, Gr@PMIH/waterborne coatings (WECs) (3:7) exhibited most effectively long-term protection. EIS measurements scratched confirm resistance inhibition Gr@PMIH/WECs (3:7). Furthermore, after 400 h salt spray testing, substrates coated showed least amount products blisters around scratches, affirming its exceptional protection performance. Thus, excellent stimuli-responsive characteristics endowed capabilities.

Язык: Английский

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Shear resistance and calculation method of GFRP-reinforced concrete beams with CFRP mesh fabric as shear reinforcement

Case Studies in Construction Materials, Год журнала: 2024, Номер unknown, С. e03904 - e03904

Опубликована: Окт. 1, 2024

Язык: Английский

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