Université Mouloud Mammeri de Tizi Ouzou (UMMTO): Research Review of Sciences and Technologies
Not a member yet
2222 research outputs found
Sort by
Investigating the Applicability of GNSS Technology for Monitoring Horizontal Displacement of Wharf Structures
Full text linkWharves, vital components of maritime infrastructure, are intricate structures typically anchored by robust pile foundations. These essential facilities face substantial environmental and operational challenges, particularly in deep-water settings where forces are amplified. To maintain structural integrity and ensure safety, precise monitoring of horizontal displacement is of paramount importance. This comprehensive study delves into the application of cutting-edge Global Navigation Satellite System (GNSS) technology for tracking wharf movement. Researchers employed both static and kinematic GNSS techniques to capture detailed displacement data across various time scales, from short-term fluctuations to long-term trends. By meticulously analyzing the collected information, experts can identify subtle displacement patterns, evaluate structural behavior under different conditions, and make informed decisions regarding maintenance and repairs. The findings of this investigation clearly demonstrate the effectiveness of GNSS as a highly reliable and accurate tool for wharf monitoring. This advanced technology offers port authorities and engineers a powerful means to safeguard these critical maritime structures, ensuring their longevity and optimal performance in the face of challenging environmental and operational demands
Effects of Waste Turmeric Oil on the Rheology and Structural Performance of Modified Bitumen
Full text linkFlexible pavements face continual degradation due to traffic and environmental stresses. Concurrently, waste materials like Waste Turmeric Oil (WTO) pose sustainability challenges. This study explores the WTO as a bio-modifier for VG30 bitumen, aiming to enhance binder performance while addressing waste disposal concerns. WTO-modified binders (WTOMB) were evaluated through physical tests (penetration, softening point, flash point) and rheological tests using a Brookfield viscometer and Dynamic Shear Rheometer (DSR). Results showed that increasing WTO content raised penetration and reduced softening points, indicating improved flexibility. Viscosity decreased by 20–25% at WTO contents above 3%, enhancing workability and reducing mixing temperatures. Short-term aging was simulated using the Rolling Thin Film Oven (RTFO) test, with all samples showing low mass loss and good thermal stability. DSR-based Performance Grade (PG) and Multiple Stress Creep Recovery (MSCR) tests indicated a significant reduction in non-recoverable creep compliance (Jnr) to 1.8 kPa¹ at 3% WTO, identifying it as the optimal dosage for rutting resistance. Although 4% WTO also achieved Jnr 2.0 kPa¹, benefits plateaued. Recovery results suggested that binders with 1–2% WTOMB are suitable for high-traffic conditions. Overall, WTO effectively enhances the performance and sustainability of bitumen binders, offering a cost-efficient and environmentally responsible solution for flexible pavement construction
Study on Pipe Strut Dimensions Optimization for Strutted Box Girder Bridge Using FEM
Full text linkAlthough the concept of a concrete box girder bridge with strutted wing slabs was proposed long ago as a means to expand the width of bridge sections without significantly increasing the self-weight of the superstructure, research on this structural system remains limited. Using data from a full-scale box girder bridge experiment conducted as part of the Ring Road II Viaduct Project in Vietnam, a finite element model was developed to investigate the influence of the steel struts' geometrical dimensions on the structural behavior of box girders. This paper examines key structural responses, including deflection, stress in the concrete slab, and stress in the steel struts, under varying steel strut dimensions—namely, thickness and diameter. The findings reveal that the diameter and thickness of the steel struts significantly affect beam deflection and strut stress, while their impact on slab stress is negligible. Furthermore, the paper provides practical recommendations for selecting optimal steel strut dimensions and highlights future research directions to enhance the design of such structures. These insights aim to benefit both practicing engineers and researchers in the field
الجزائر في رحلة المستشرق الفرنسي جي دي موباسان "رحلة إلى الجزائر إلى بلاد الشمس"
Full text linkThis research paper seeks to elucidate the function of Western travel literature and its Orientalist aspects in connecting literature, cultures, and knowledge. Knowledge serves as a conduit between nations and peoples, both culturally and socially, thus providing a rich field for Orientalist studies. Consequently, this paper highlights key linguistic and terminological concepts foundational to the research. Additionally, it examines how Orientalist travels have influenced the representation of the self in relation to the other, employing a cultural approach as the most suitable method to derive conclusions necessitating well-defined frameworks
خطبة البيعة لأبي بكر الصّدّيق: دراسة بلاغيّة وأسلوبيّة
Full text linkThe speech was read rhetorically by addressing the knowledge of some of its rhetorical characteristics. On the other hand, some of its stylistic characteristics were known; For example: stylistic options such as functional, structural and expressive options, and some of their stylistic levels, such as the phonetic, and semantic level…etc., were known, so that loud and intense sounds are the most commonly used; This confirms the importance of its tolerance of the affairs of the parish, and the semantic fields that dominated this discourse were known to achieve some meanings and connotations that confirm the extent of the responsibility. As for intertextuality, this sermon knew the presence of the old text along with the present text
Real-Time and Full-Scale Numerical Analysis and Monitoring of Displacements in the Left Bank of the Tabellout RCC Arch Dam during Construction and Operation, Jijel Province, Algeria
Full text linkThis study provides a comprehensive evaluation of the Tabellout RCC dam in Jijel Province, Algeria, a unique structure classified as a combined gravity-arch dam. It addresses critical geotechnical, hydraulic and structural stability aspects, presenting significant contributions to the field of dam engineering by advancing the understanding of the interaction between RCC layers and adjacent slopes under operational conditions. This research employs real-time, full-scale numerical modelling using "Plaxis 2D," with a particular focus on arch behavior. The study bridges a gap by integrating hydrostatic and hydrodynamic pressures measured during the initial filling phase into the model, offering insights into the dam’s behavior under both static and dynamic conditions. Monitoring of RCC layers across three elevations prior to operation revealed minimal displacements, with a maximum recorded displacement of 1 mm in the critical interaction zone between the RCC and the left bank slope. Post-operation analysis demonstrated uniform deformation across elevations, with a negligible 1 mm variance, confirming the homogeneity of RCC stiffness—an essential factor for structural stability. The safety factor (FoS) analysis confirmed stability under static conditions, but highlighted vulnerabilities under seismic conditions, underscoring the need for enhanced resilience measures. This work extends findings from previous studies, particularly by validating the importance of a seismic belt at the foundation, through detailed numerical analysis and comparison with real-time monitoring data from PDL pendulums.
A review on carbonation in cement composites and its impacts on durability and potential for CO₂ sequestration
No full textCarbonation is a key process affecting the durability, strength, and environmental impact of concrete. While it refines pore structure and enhances strength, it also lowers alkalinity, leading to reinforcement corrosion risks. The carbonation rate is influenced by CO₂ concentration, relative humidity, w/c ratio, binder composition, and exposure conditions, all of which determine its impact on concrete performance. This review examines the mechanism of carbonation, influencing factors, effects on mechanical and durability properties, and the relationship between natural and accelerated carbonation. The study highlights that carbonation influences mechanical and durability properties, with research showing that moderate carbonation curing increases compressive strength by 10–30%. Still, excessive carbonation leads to C-S-H decalcification, reducing durability. While accelerated carbonation tests show a carbonation rate 10-15 times faster than natural exposure, the corresponding increase in carbonation depth is only 2.5-5 times, indicating a non-linear relationship that complicates the direct prediction of long-term field performance from laboratory data. Case studies confirm that protected concrete surfaces exhibit minimal carbonation depth (10 mm in 100 years), whereas exposed surfaces reach up to 50 mm, causing surface deterioration. Additionally, carbonation contributes to CO₂ sequestration, with Itaipu Dam alone absorbing 13,384 tons of CO₂ over 35 years. This comprehensive analysis emphasizes the need for refined, experimentally validated models to accurately predict carbonation and harness its benefits while mitigating risks in future sustainable concrete design
Prediction of Compressive Strength by Considering Practical Consideration Non-destructive Test by Artificial Neural Network
Full text linkAccurate assessment of concrete compressive strength is critical for evaluating structural performance. While nondestructive testing (NDT) methods, such as Schmidt rebound hammer tests, offer rapid and NDT gives result with reasonable accurate based on environmental factors such as temperature, humidity etc of site and condition in which test is performed. Destructive testing (DT) methods, like core cutting, provide direct and accurate results. This study aimed to bridge the gap between these approaches by developing predictive models that correlate DT and NDT results. Experimental work involved 126 laboratory-prepared samples (grades M10–M40) with curing age of 14 day and 28 day and 231 field samples from a 20-year-old structure, tested using both methods. Total 357 no. of data samples were created with different mix proportion of design, curing ages and on-site environmental exposed concrete structure without unknown grade. Most of the researches were done while preparation of samples in the laboratory. For these purposes of taking mixing both variations such as control (Laboratory) and uncontrolled(on-site) samples were to prepare as a practical condition for prediction. For generation of predict model 70% data was used with methods such as regression analysis and Cascade forward back propagation neural network (CFBPNN) were used for investigation. To validate the prediction 30% data was used which was not used in model generation. The prediction results show that the coefficients of determination (R2) of the Regression analysis and the CFBPNN prediction models for the test set of concrete compressive strength are 95% and 99% respectively ANN model founded to be more accurate as compare to regression analysis. The validation by R2 of the Regression analysis and the CFBPNN prediction model for the compressive strength for above dataset was 89.0% and 98%. Statistical metrics (MSE, RMSE, MAPE) further confirmed the neural network’s superior accuracy
A Comparative Analysis of Isolated and Tapered Footing with Insertions for Eccentric Load
Full text linkConventional footings for boundary line columns often suffer from tilt and uneven pressure distribution due to eccentric loading, reducing their performance. While combined and strap footings are commonly used to address eccentric loads, they rely on adjacent footings, limiting their effectiveness in independent foundation systems. This study develops and evaluates two innovative designs—Isolated Footing with Insertion (IFI) and Tapered Footing with Insertion (TFI)—to mitigate these challenges. Using finite element analysis in ANSYS, the performance of these designs was assessed under varying eccentric loading conditions, with insertion depth ratios (H/B) ranging from 0 to 1.0 and eccentricity ratios (x/B) from 0.1 to 0.5. Results indicate that both designs significantly outperform conventional footings, with the IFI design reducing settlement and tilt by up to 5 times at H/B = 1.0. The TFI design demonstrated further improvements, delivering 1.18 to 1.39 times better performance than IFI across all insertion depths while reducing material usage by 15–20%. Optimal performance for TFI was observed at H/B = 0.4, striking a balance between structural efficiency and material economy. These findings highlight TFI as an efficient and economical solution for managing eccentric loads, particularly for boundary columns and space-constrained sites