Investigation on the evolution of concrete pore structure under freeze-thaw and fatigue loads

Journal of Building Engineering, Journal Year: 2024, Volume and Issue: unknown, P. 110914 - 110914

Published: Oct. 1, 2024

Language: Английский

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A novel cement-based interface functional material for application onto shotcrete-rock interface of tunnel in cold regions

Construction and Building Materials, Journal Year: 2024, Volume and Issue: 438, P. 136923 - 136923

Published: June 24, 2024

Language: Английский

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Study on performance deterioration and life prediction of reed straw-recycled brick aggregate concrete after freeze-thaw cycle

Case Studies in Construction Materials, Journal Year: 2024, Volume and Issue: 21, P. e03728 - e03728

Published: Sept. 10, 2024

Language: Английский

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Study on damage evolution law and pore structure deterioration of recycled composite micro-powder concrete under freeze-thaw action

Journal of Building Engineering, Journal Year: 2024, Volume and Issue: 96, P. 110662 - 110662

Published: Sept. 4, 2024

Language: Английский

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Study on the forming method and subgrade performance of construction waste recycled material specimen

Journal of Building Engineering, Journal Year: 2025, Volume and Issue: unknown, P. 112114 - 112114

Published: Feb. 1, 2025

Language: Английский

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Interfacial Damage Mechanisms and Performance Prediction in Recycled Aggregate Concrete

Coatings, Journal Year: 2025, Volume and Issue: 15(4), P. 441 - 441

Published: April 8, 2025

To address the growing demand for sustainable construction and efficient recycling of waste concrete resources, this study investigates interfacial performance mechanical property prediction recycled aggregate (RAC) under varying (RA) replacement ratios (r = 0%, 30%, 60%, 100%). A comprehensive experimental program was implemented, including uniaxial compression tests microscopic characterization using scanning electron microscopy (SEM), to evaluate macro- microscale damage evolution transition zone (ITZ) properties RAC. Based on Weibull’s statistical strength theory, a constitutive model RAC developed, two-dimensional random implemented in Abaqus simulate initiation propagation processes at different ratios. The results demonstrate that compressive decreases as RA ratio increases, while optimal is achieved 30% ratio. reveals failure initiates ITZ between aggregates cement matrix, subsequently propagating complete structural failure. proposed accurately predicts stress–strain behavior across ratios, showing excellent agreement with data. These findings provide valuable insights into mechanisms RAC, offering theoretical foundation optimizing design application engineering projects.

Language: Английский

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Study on compressive strength and pore structure evolution of nano‐silica modified aeolian sand concrete under freeze–thaw cycle based on fractal dimension

Structural Concrete, Journal Year: 2025, Volume and Issue: unknown

Published: April 19, 2025

Abstract This study investigates the deterioration patterns of nano‐SiO₂ modified aeolian sand concrete (NS‐ASC) under salt frost conditions. NS‐ASC was prepared using at dosages 0%, 1%, 2%, 3%, and 4%, with 30% sand. The performance degradation resistance mechanisms were analyzed through compressive strength tests (macroscopic) microscopic (SEM NMR) before after freeze–thaw cycles (FTCs). Additionally, pore fractal dimension D ( min max ) different FTCs derived from NMR results. A model developed to predict conditions, NS dosage as variables. results indicated that gradually declined increasing FTCs. After 200 FTCs, ANS‐1, ANS‐2, ANS‐3, ANS‐4 exhibited increases 31.1%, 36.92%, 105.49%, 82.32%, respectively, demonstrating improved compared ASC without NS. incorporation effectively filled ASC's internal pores, reducing damage. Moreover, showed a gradual decline reflecting progressive disruption structure due frost. evolved complex simpler, small pores transforming into larger ones. increased . based on contribution rate described variation in environments. provides theoretical foundation for analyzing damage

Language: Английский

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Study of Concrete Deterioration Damage by Landfill Leachate in Cold Regions

Materials, Journal Year: 2025, Volume and Issue: 18(10), P. 2361 - 2361

Published: May 19, 2025

The corrosion mechanism of concrete structures in landfills cold regions is complex, and there are few existing studies that address multifactorial coupled deterioration scenarios. Since loading freeze-thaw cycles affect deterioration, this study included three test groups—landfill leachate, loaded-landfill cycles-loaded-landfill leachate—and different scenarios—gas-liquid, liquid-solid, gas-liquid-solid. physico-mechanical changes terms mass, compressive strength, dynamic elasticity modulus were analyzed, the was elaborated by its apparent morphology scanning electron microscope (SEM) images. showed most serious damage to caused cycles, loading, landfill leachate situations. strength elastic decreased; endpoints decreased 15.75% 7.42%, respectively, increased 12.51% 6.74% compared with unapplied load group. gas-liquid-solid group had among scenarios, a 21.63% decrease strength. This determined unfavorable conditions for exposed provides technical reference construction facilities.

Language: Английский

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Mechanical Damage and Freeze‒Thaw Damage of Concrete with Recycled Brick Coarse Aggregate

Sustainability, Journal Year: 2024, Volume and Issue: 16(13), P. 5643 - 5643

Published: July 1, 2024

The influence of different recycled brick coarse aggregate (RBA) substitution rates on the mechanical performance and frost resistance concrete was observed. test findings revealed that RBA deteriorated compressive flexural properties in improved tensile plasticity to some extent. can be effectively by adding RBA. degree factor quantified gray entropy correlation theory, correlations between freezing thawing cycles, natural rate, damage value (DN) were 0.9979, 0.9914, 0.9876, respectively. Moreover, model about GM(1, 1) theory developed (R2 > 0.87), which better predict concrete. mechanism during revealed.

Language: Английский

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Frost resistance and improvement techniques of recycled concrete: a comprehensive review

Frontiers in Materials, Journal Year: 2024, Volume and Issue: 11

Published: Oct. 28, 2024

In the pursuit of sustainable construction practices, utilization recycled concrete has emerged as a pivotal strategy, distinguished by its commitment to resource conservation and environmental stewardship. Nevertheless, inherent micro-porosity micro-cracking within old mortar may lead weak bonding performance at interfacial transition zone, culminating in diminished strength, reduced density, elevated water absorption rates compared conventional concrete, which critically impairs cold climates subjected freeze-thaw cycles. Consequently, this paper provides structured examination frost resistance properties cycling. Initially, study delineates mechanisms frost-induced damage synthesizing degradation pathways observed both during exposure. Subsequently, detailed analysis is conducted identify factors affecting resistance, encompassing proportion moisture affinity aggregates, addition silica fume fly ash, water-to-cement ratio, degree saturation. final segment, compiles reviews strategies for bolstering including incorporation air-entraining admixtures, fiber reinforcement, aggregate modification approaches. The objective research offer thorough comprehension with concentration on damage, critical determinants interventions augment resilience against freezing conditions. On basis, present paper, conjunction characteristics current status proposes recommendations application regions. This review anticipated facilitate researchers gaining comprehensive understanding measures enhance resistance. Furthermore, it aims assist engineering technical personnel selecting appropriate treatment methods improve regions, thereby promoting practical such areas.

Language: Английский

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