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Use of Additive Based on Non-Timber Forest products for the Ecological Stabilization of Raw Earth:Case of the parkia Biglobosa Nut and Vitellaria paradoxa

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Journal of Renewable Materials 2023年第12期11卷 4143-4160页

作者： Bio Chéïssou Koto Tamou Jean-Michel Mechling crespin prudence yabi Gildas EdjrossèF.Godonou Edmond Codjo Adjovi Mohamed Gibigaye AndréLecomte Nicolas Brosse L2EGC-Laboratory of Studies and Tests in Civil Engineering University of SciencesTechnologyEngineeringand MathematicsAbomeyBenin IJL-Jean Lamour Institute University of LorraineNancyFrance LEMA-Laboratory of Energetics and Applied Mechanics University of Abomey-CalaviAbomey-CalaviBenin LERMAB-Study and Research Laboratory on Wood Material University of LorraineNancyFrance

The housing sector today uses elaborate materials such as cement,iron,sand,often prohibitively expensive and whose production generates a strong environmental impact(scarcity of resources,transport,greenhouse gas greenhouse,etc.).In order to meet the challenges of sustainable development,earth construction is experiencing a resurgence of interest these *** its many advantages,raw earth material has drawbacks,in particular its low mechanical resistance and its loss of geometric characteristics in the face of water,which slow down its *** part of this study,the mechanical characteristics and durability of raw earth were improved by using residual water from the processing of parkia Biglobosa(nere)and Vitellaria paradoxa(shea)nuts in order to optimize its use for the construction of modern *** this end,the decoctions resulting from the artisanal transformation of the nut of the parkia Biglobosa into African mustard and of the Vitellaria paradoxa into shea butter were added to the raw earth according to volume proportions of 25%,50%,75%and 100%of the aqueous solution to obtain the projected ***,mechanical characterization and durability tests were carried out on the composites *** results revealed that the decoctions of Vitellaria paradoxa and parkia Biglobosa improve the compressive strength of the material by up to 90%and 260%,***,these decoctions improved the resistance to water penetration of the 100%additive composite by 1.5 times for Vitellaria paradoxa and 5 times for parkia *** study shows that it is possible to use decoctions as raw earth stabilizers to build modern,ecological buildings at lower energy ***,more in-depth studies on surface wettability and long-term durability are planned to better characterize the geomaterial.

关键词： Raw earth organic additive adobe Vitellaria paradoxa parkia Biglobosa durability

Critical Assessment of Slope Stability: A Case Study on the Toffo-Lalo Road project

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Modern Mechanical Engineering 2023年第4期13卷 77-100页

作者： Guy Oyéniran Adeoti Judicaël Koffi Agbelele crespin prudence yabi Rufin Nongnidé Kinhoun Éric Adéchina Alamou Laboratory of Testing and Studies in Civil Engineering (L2EGC) National University of Science Technology Engineering and Mathematics (UNSTIM) Abomey Benin National School of Technical Education (ENSET) Lokossa Republic of Benin

This article systematically delves into a comprehensive analysis of the latest and most advanced techniques for the assessment of slope stability. It particularly focuses on strategies aimed at enhancing slope stability in road construction. In addition to this analysis, the article presents an illustrative case study centered on the Toffo-Lalo Road project. The core objective of this paper is to scrutinize the stability of large embankments in road construction, with a specific emphasis on the development and asphalt overlay of the Toffo-Lalo road. This scrutiny is conducted through the utilization of stability calculation software, GEOSTUDIO2018, specifically its SLOpE/W module. Within this framework, a detailed model of the cutbank located at Kp1+750-2+250 was meticulously developed. This model takes into account the physical-mechanical characteristics of the soil at the site, as well as the topographic layout. Its attributes include a cohesion value of 11.3 Kpa, a density of 16.57 KN/mp>3p>, and a friction angle of 27˚. The modeling results, employing the Morgenstern-price method—an approach renowned for its adherence to equilibrium conditions and provision of precise results—conclude that the safety coefficient (Fs = 1.429) prior to any reinforcement signifies a critical state of slope stability. To address this, the article explores the implementation of reinforcement techniques, particularly focusing on rigid inclusions like nailing and piles. The modeling exercises reveal a noteworthy enhancement in the safety coefficient (Fs) post-reinforcement. Furthermore, the article undertakes a parametric study to optimize the reinforcement strategies. This analysis highlights that anchoring at 0˚ downward relative to the horizontal plane and employing a pile angle of 90˚ represent the most favorable approaches. These measures yield safety coefficients of 3.60 and 2.34, respectively, indicating substantially improved slope stability.

关键词： GEOSLOpE Morgenstern-price Method Numerical Modelling Safety Coefficient Soil Cohesion and Slope Stability

Influence of Some plant Fibers on the Mechanical performance of Composite Materials

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Open Journal of Civil Engineering 2023年第4期13卷 814-826页

作者： Serge pierre Quenum Yvette S. Tankpinou Kiki Judicaël Koffi Agbelele crespin prudence yabi Edmond Codjo Adjovi Laboratoire de procédés et d’Innovation Technologique UNSTIM Abomey Benin Laboratoire pluridisciplinaire de l’Enseignement Technique UNSTIM Abomey Benin Laboratoire d’Etudes et d’Essais en Génie-Civil UNSTIM Abomey Benin

This work focused on the search for biobased materials capable of being used in road techniques as soil inclusions, and on studying the influence of their incorporation on the characteristic parameters of pavement layers. To this end, pineapple, cyperus and imperata plant fibers, due to their endemic availability, were used as reinforcement on sourced materials, notably bar soil, lateritic gravel and silty sand. Complete identification and mechanical tests (proctor and CBR) were carried out on materials in their natural state (soil) and on composite materials (soil + plant fibers) in the laboratory to determine their classification in road geotechnics, their compaction parameters and their mechanical behavior. Firstly, the various types of 2.5 cm long fibers were incorporated into the different types of soil at mass contents of 1% and 2%. This part of the study showed that the pineapple fiber composite incorporated into class A2 bar soil offered the best results, with a 38% gain in CBR index compared with the natural soil. pineapple fibers incorporated at 1% in lateritic gravel raise the CBR value of the reinforced soil to 10% of the CBR value of the natural soil and to 7% for silty sand.

关键词： plant Fibers Soils Composite Materials Reinforcement

Strategies for Advancing Road Construction Slope Stability: Unveiling Innovative Techniques for Managing Unstable Terrain

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Open Journal of Civil Engineering 2023年第4期13卷 572-616页

作者： Guy Oyéniran Adeoti Judicaël Koffi Agbelele crespin prudence yabi Rufin Nongnidé Kinhoun Éric Adéchina Alamou Laboratory of Testing and Studies in Civil Engineering (L2EGC) National University of Science Technology Engineering and Mathematics (UNSTIM) Department of Zou Abomey Republic of Benin National School of Technical Education (ENSET) Lokossa Republic of Benin

This comprehensive review paper explores various aspects of geotechnical engineering, with a focus on the management of unstable terrains, numerical methods for solving complex soil and consolidation problems, rheological analysis of suspensions and muddy soils, and stability analysis of slopes. It begins by examining the unique physicochemical properties of cohesive sediments, including cohesion and specific surface area. The temporal evolution of deposit concentration and average bed concentration in unstable terrains is discussed, along with settling behavior of isolated particles and hindered settling using empirical equations. Key sedimentation theories, such as Kynch’s theory, and geotechnical consolidation theories, including Terzaghi’s consolidation equation and Gibson’s theory, are presented. The investigation interrelates these theories and principles to offer a holistic view of managing unstable terrains. It also addresses the challenges associated with experimental determination of constitutive relationships and presents alternative simplification methods proposed by researchers. Additionally, it delves into numerical methods for solving nonlinear partial differential equations governing soil behavior, emphasizing the need for numerical frameworks and discussing various techniques and associated challenges. The rheological analysis section covers material flow behavior, rheological behavior models, and the rheological properties of water and cohesive sediment mixtures. Fundamental geotechnical calculations, constitutive laws, and failure criteria are explained, highlighting their relevance in geotechnical engineering applications. This paper provides a multidimensional perspective on geotechnical engineering, offering valuable insights into soil properties, consolidation processes, numerical methods, rheological analysis, and slope stability assessment for professionals in the field.

关键词： Consolidation processes Managing Unstable Terrain Numerical Methods Safety Coefficient Slope Stability Assessment Soil Cohesion

Critical Assessment of Slope Stability: A Case Study on the Toffo-Lalo Road project

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