Unlocking the Potential of RFA and Stabilizers in High Moisture Geotechnical Applications

Applied Sciences, Год журнала: 2025, Номер 15(3), С. 1270 - 1270

Опубликована: Янв. 26, 2025

In recent decades, rapid urbanization has generated a large amount of waste soft soil and construction debris, resulting in severe environmental pollution posing significant challenges to engineering construction. To address this issue, study explores an innovative approach that synergistically applies recycled fine aggregate (RFA) stabilizers improve the mechanical properties soil. Through laboratory experiments, systematically examines effects different mixing ratios RFA (20%, 40%, 60%) (10%, 15%, 20%) with red clay. After standard curing, samples underwent water immersion maintenance for varying durations (1, 5, 20, 40 days). Unconfined compressive strength (UCS) tests were conducted evaluate performance samples, mechanisms further analyzed using scanning electron microscopy (SEM) particle size distribution (PSD) analysis. The results indicate optimal is achieved 20% stabilizer, reaching highest UCS value after days immersion. This improvement primarily attributed formation dense reticulated structure, where particles are effectively encapsulated by clay stabilized hydration products from forming robust structural system. Unconsolidated undrained (UU) reveal peak deviatoric stress increases confining pressure stabilizer content but decreases when excessive added. Shear parameter analysis demonstrates both internal friction angle (φ) cohesion (c) closely related ratios, best observed at RFA. PSD confirms increasing enhances aggregation, while SEM observations visually illustrate denser microstructure. These findings provide feasible solution treatment resource utilization as well critical technical support theoretical guidance geotechnical practices high-moisture environments.

Язык: Английский

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Performance Evaluation of Concrete Using Recycled Coarse Aggregate and Sea Sand as Sustainable Alternatives

E3S Web of Conferences, Год журнала: 2025, Номер 621, С. 01013 - 01013

Опубликована: Янв. 1, 2025

With growing environmental concerns over the depletion of natural resources and adverse impact excessive sand mining, there is an increasing demand for sustainable alternatives in concrete production. This study investigates performance incorporating recycled coarse aggregate (RCA) sea as replacements aggregates, aiming to reduce while maintaining strength durability. Recycled addresses waste management issue construction, offers a plentiful alternative river sand, though it requires treatment mitigate chloride contamination. The experimental program included comprehensive evaluation properties, such workability, compressive strength, water absorption, porosity, resistance aggressive environments. results showed that use RCA slightly reduced workability but had minimal on especially mixes with treated (R40-T). improved enhanced durability by reducing acid sulphate attacks. mix R40-T-30 demonstrated best overall terms both demonstrates combination provides solution production, balancing benefits structural performance.

Язык: Английский

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Effect of carbonated recycled aggregates on the mechanical properties and bonding performance of polyurethane mortar as a repair material

Journal of Engineering and Applied Science, Год журнала: 2025, Номер 72(1)

Опубликована: Март 29, 2025

Abstract Recycled aggregate (RA) made from construction waste has limited application due to its high porosity, numerous cracks, and other disadvantages such as reduced concrete strength when using aggregate). In this paper, carbonated recycled (CRA) was obtained by carbonating aggregate, natural (NA) in polyurethane mortar (PUM) replaced at different ratios. The physical changes pore structure of RA before after carbonation, the mechanical properties (compressive flexural strength) PUM, three-point bending bond performance were systematically investigated. compactness PUM detected ultrasonic velocity (UPV) test. change mechanism microstructure revealed scanning electron microscopy (SEM). results show that replacement rate is 50%, compressive increased 7.32% 15.83%, respectively, 14.19%, all which are greater than increase a 25%. P with decreased, but generated calcium carbonate carbonation treatment can fill surface pores enhance CRA, test pieces same ratio improved compared those RA.

Язык: Английский

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Sustainable construction practices in urban areas: innovative materials, technologies, and policies to address environmental challenges

Energy and Buildings, Год журнала: 2025, Номер 341, С. 115831 - 115831

Опубликована: Май 5, 2025

Язык: Английский

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Stabilising CDW recycled aggregates with alternatives to Portland cement

Construction and Building Materials, Год журнала: 2025, Номер 471, С. 140705 - 140705

Опубликована: Март 8, 2025

Язык: Английский

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Automated recognition of contaminated construction and demolition wood waste using deep learning

Resources Conservation and Recycling, Год журнала: 2025, Номер 219, С. 108278 - 108278

Опубликована: Апрель 4, 2025

Язык: Английский

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Evaluating Water Infiltration and Runoff: Stretcher Bond vs. 45° Herringbone Patterns in Permeable Interlocking Concrete Pavements

CivilEng, Год журнала: 2025, Номер 6(2), С. 24 - 24

Опубликована: Май 6, 2025

Pavement deterioration is often the result of intense traffic and increased runoff from storms, floods, or other environmental factors. A practical solution to this challenge involves use permeable pavements, such as interlocking concrete pavement (PICP), which are designed effectively manage water while supporting heavy traffic. This research investigates effectiveness PICP in two distinct surface patterns: stretcher bond 45° herringbone, by assessing their performance terms infiltration using different methods. The first approach has been conducted experimentally a laboratory apparatus simulate rainfall. Various conditions were applied during tests, including longitudinal (L-Slope) transverse (T-Slope) slopes (0, 2, 4%) rainfall intensities (40 80 L/min). second implemented theoretically Surfer 2.0 software distribution infiltrated underneath layers PICP. Moreover, behavior analyzed statistically artificial neural networks (ANNs). results indicated that at intensity 40 L/min, equal was observed both patterns on 0% 4% T-Slope. However, herringbone showed better 8% Additionally, L/min rainfall, L-Slope for also demonstrated higher T-Slope, trend continued increased. with pattern exhibited superiority reducing compared pattern. statistical models demonstrate high accuracy, evidenced correlation coefficient (R2) values 99.97% 97.32%, respectively, confirms validity. Despite variations between forms PICP, strongly endorsed excellent alternatives conventional pavement.

Язык: Английский

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Detection of Crack Sealant in the Pretreatment Process of Hot In-Place Recycling of Asphalt Pavement via Deep Learning Method

Sensors, Год журнала: 2025, Номер 25(11), С. 3373 - 3373

Опубликована: Май 27, 2025

Crack sealant is commonly used to fill pavement cracks and improve the Pavement Condition Index (PCI). However, during asphalt hot in-place recycling (HIR), irregular shapes random distribution of crack sealants can cause issues like agglomeration ignition. To address these problems, it necessary mill large areas containing or pre-mark locations for removal after heating. Currently, detecting recording locations, types, distributions conducted manually, which significantly reduces efficiency. While deep learning-based object detection has been widely applied distress detection, present unique challenges. They often appear as wide black patches that overlap with potholes, complex background noise further complicates detection. Additionally, no dataset specifically currently exists. overcome challenges, this paper presents a specialized created from 1983 images. A learning algorithm named YOLO-CS (You Only Look Once Sealant) proposed. This integrates RepViT (Representation Learning Visual Tokens) network reduce computational complexity while capturing global context Furthermore, DRBNCSPELAN (Dilated Reparam Block Cross-Stage Partial Efficient Layer Aggregation Networks) module introduced ensure efficient information flow, lightweight shared convolution (LSC) head developed. The results demonstrate outperforms other algorithms, achieving precision 88.4%, recall 84.2%, an mAP (mean average precision) 92.1%. Moreover, parameters memory consumption. Integrating Artificial Intelligence-based algorithms into HIR enhances construction

Язык: Английский

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Evaluation of cement-treated recycled concrete aggregates for sustainable pavement base/subbase construction

Construction and Building Materials, Год журнала: 2024, Номер 449, С. 138417 - 138417

Опубликована: Сен. 28, 2024

Язык: Английский

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Optimizing construction and demolition waste management in Nigeria: challenges, regulatory frameworks, and policy solutions

Deleted Journal, Год журнала: 2024, Номер 1(1)

Опубликована: Дек. 17, 2024

Construction and demolition (C&D) waste management is a pressing environmental concern in developing countries like Nigeria, where inadequate infrastructure weak regulatory enforcement create significant challenges. This study provides detailed analysis of C&D practices identifying key factors influencing these major barriers to sustainability. Data were gathered from surveys interviews with 150 stakeholders, including contractors, engineers, policymakers, managers. The data involved both quantitative qualitative techniques provide comprehensive understanding findings reveal heavy reliance on landfills, driven by high costs, insufficient recycling facilities, economic disincentives for sustainable practices. A critical gap was noted between the awareness existing regulations their enforcement, indicating need stronger frameworks more consistent enforcement. multiple regression demonstrated that frameworks, socio-economic factors, education levels significantly affect practices, highlighting importance promoting emphasizes an integrated approach improve advocating enhanced measures, development, continuous training programs. These offer valuable insights policymakers industry suggesting targeted strategies overcome identified foster Future research should address underrepresented regions ensure equitable improvements nationwide, ultimately supporting sustainability growth.

Язык: Английский

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