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Multi-scale analysis of carbon mineralization in lime-treated soils considering soil mineralogy

Journal of Rock Mechanics and Geotechnical Engineering 2024年第6期16卷 2296-2309页

作者： Dhanalakshmi Padmaraj Chinchu Cherian Dali Naidu Arnepalli Department of Civil Engineering Indian Institute of Technology MadrasChennai600036India University of Northern British Columbia Prince GeorgeBCV2N4Z9Canada

Mineral carbonation is emerging as a reliable CO_(2) capture technology that can mitigate climate change.In lime-treated clayey soils,mineral carbonation occurs through the carbonation of free lime and cementitious products derived from pozzolanic reactions.The kinetics of the reactions in lime-treated clayey soils are variable and depend primarily on soil mineralogy.The present study demonstrates the role of soil mineralogy in CO_(2) capture and the subsequent changes caused by carbon mineralization in terms of the unconfined compressive strength(UCS)of lime-treated soils during their service life.Three clayey soils(kaolin,bentonite,and silty clay)with different mineralogical characteristics were treated with 4%lime content,and the samples were cured in a controlled environment for 7 d,90 d,180 d,and 365 d.After the specified curing periods,the samples were exposed to CO_(2) in a carbonation cell for 7 d.The non-carbonated samples purged with N2 gas were used as a benchmark to compare the mechanical,chemical-mineralogical,and microstructure changes caused by carbonation reactions.Experimental investigations indicated that exposure to CO_(2) resulted in an average increase of 10%in the UCS of limetreated bentonite,whereas the strength of lime-treated kaolin and silty clay was reduced by an average of 35%.The chemical and microstructural analyses revealed that the precipitated carbonates effectively filled the macropores of the treated bentonite,compared to the inadequate cementation caused by pozzolanic reactions,resulting in strength enhancement.In contrast,strength loss in lime-treated kaolin and silty clay was attributed to the carbonation of cementitious phases and partly to the tensile stress induced by carbonate precipitation.In terms of carbon mineralization prospects,lime-treated kaolin exhibited maximum carbonation due to the higher availability of unreacted lime.The results suggest that,in addition to the increase in compressive strength,adequate calcium-bearing phases and macropores determine the effic

关键词： clays Mineralogy Carbon capture Lime Strength Pore structure

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Optimized functional linked neural network for predicting diaphragm wall deflection induced by braced excavations in clays

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Geoscience Frontiers 2022年第2期13卷 34-51页

作者： Chengyu Xie Hoang Nguyen Yosoon Choi Danial Jahed Armaghani School of Environment and Resources Xiang tan UniversityXiangtan 411105China Department of Surface Mining Mining FacultyHanoi University of Mining and GeologyDuc ThangBac Tu LiemHanoiViet Nam Innovations for Sustainable and Responsible Mining(ISRM)Group Hanoi University of Mining and GeologyDuc ThangBac Tu LiemHanoiViet Nam Department of Energy Resources Engineering Pukyong National UniversityBusan 48513Republic of Korea Department of Urban Planning Engineering Networks and SystemsInstitute of Architecture and ConstructionSouth Ural State University76Lenin ProspectChelyabinsk 454080Russia

Deep excavation during the construction of underground systems can cause movement on the ground,especially in soft clay layers.At high levels,excessive ground movements can lead to severe damage to adjacent structures.In this study,finite element analyses(FEM)and the hardening small strain(HSS)model were performed to investigate the deflection of the diaphragm wall in the soft clay layer induced by braced excavations.Different geometric and mechanical properties of the wall were investigated to study the deflection behavior of the wall in soft clays.Accordingly,1090 hypothetical cases were surveyed and simulated based on the HSS model and FEM to evaluate the wall deflection behavior.The results were then used to develop an intelligent model for predicting wall deflection using the functional linked neural network(FLNN)with different functional expansions and activation functions.Although the FLNN is a novel approach to predict wall deflection;however,in order to improve the accuracy of the FLNN model in predicting wall deflection,three swarm-based optimization algorithms,such as artificial bee colony(ABC),Harris’s hawk’s optimization(HHO),and hunger games search(HGS),were hybridized to the FLNN model to generate three novel intelligent models,namely ABC-FLNN,HHO-FLNN,HGS-FLNN.The results of the hybrid models were then compared with the basic FLNN and MLP models.They revealed that FLNN is a good solution for predicting wall deflection,and the application of different functional expansions and activation functions has a significant effect on the outcome predictions of the wall deflection.It is remarkably interesting that the performance of the FLNN model was better than the MLP model with a mean absolute error(MAE)of 19.971,root-mean-squared error(RMSE)of 24.574,and determination coefficient(R^(2))of 0.878.Meanwhile,the performance of the MLP model only obtained an MAE of 20.321,RMSE of 27.091,and R^(2)of 0.851.Furthermore,the results also indicated that the proposed hybrid models,i.e.,ABC-FLNN,HHO-FLNN,HGS-FLNN,yi

关键词： Diaphragm wall deflection Braced excavation Finite element analysis clays Meta-heuristic algorithms Functional linked neural network

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Adsorption of phenthoate and acetochlor from water by clays and organoclays

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Journal of Environmental Sciences 2004年第5期16卷 738-741页

作者： LIAOMin XIEXiao-mei CollegeofEnvironmentalandResourceSciences DepartmentofResourcesScienceZhejiangUniversityHangzhou310029China

Adsorption of phenthoate and acetochlor onto kaolin, montmorillonite, bentonite clays and respective organoclays prepared by the exchange of quaternary ammonium as tetradecyltrimethyl ammonium bromide(TTAB), dodecyltrimethylammonium bromide(DTAB), and cetylpyridinium chloride(CPC) were studied. The adsorption equilibrium data points were fitted to Freundlich isotherm equations. The adsorption of phenthoate and acetochlor were significantly enhanced by surfactant treatment of the clays. The amount of both pesticides adsorbed per unit mass of organoclay followed the order of TTA-kaolin clays. The removal efficiency of organomontmorillonite to treat acetochlor is in the order of CP(C 16 )-montmorillonite > TTA(C 14 )-montmorillonite > DTA(C 12 )-montmorillonite. Phenthoate is adsorbed to greater extent than acetochlor by each adsorbent, which may be due to the higher hydrophobicity of phenthoate, indicating considerable hydrophobic interaction between adsorbent/adsorbate systems.

关键词： adsorption clays organoclays phenthoate acetochlor

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A new method of developing elastic-plastic-viscous constitutive model for clays

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Science China(Technological Sciences) 2020年第2期63卷 303-318页

作者： LU DeChun MIAO JinBo DU XiuLi LIANG JingYu Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of TechnologyBeijing 100124China

A new method is presented to develop the existing elastic-plastic constitutive model into an elastic-plastic-viscous one for clays.The actual loading process is divided into an instant process and a delayed process denoting the elastic-plastic strain and viscous strain, respectively. The elastic-plastic strain is determined by either an elastic-plastic model for overconsolidated clays or an improved model based on the elastic-plastic model for normally consolidated clays. In order to calculate viscous strain, a reference state line is defined based on the actual loading path. Combining the reference state line, an existing elastic-plastic model can be conveniently developed into an elastic-plastic-viscous model. Furthermore, using the proposed method, the modified cam clay model is extended into an elastic-plastic-viscous model. Comparisons with test results demonstrate that the extended model can capture the main time-dependent behaviours of clays, including creep, stress relaxation and strain rate effects.

关键词： clays constitutive model reference state line time-dependent behaviours creep strain rate

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Trace elemental signatures and mineral chemistry of clays associated with the alteration halos of the Paleoproterozoic U mineralization in Bijawars of the Sonrai Basin,Central India

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Acta Geochimica 2020年第3期39卷 365-386页

作者： Surendra Kumar Jha Rashmi Sharma Jaya Prakash Shrivastava University of Delhi DelhiIndia Department of Cement Technology A.K.S.UniversitySatnaMPIndia

Paleoproterozoic Bijawars of the Sonrai basin consists of(a) Sonrai(mostly carbonate carbonaceous shale and phosphatic breccia) and(b) Solda Formations(commonly chloritic and ferruginous shale) with well-developed clay-organo-rich facies,often marked with hydrothermal activities.Previous studies revealed abundance order of kaolinite> chlorite> illite> smectite;and kaolinite> illite> chlorite in clay(0.2-2.0 μm) fractions separated from the Sonrai and Solda Formations,respectively.To understand atomic substitutions and trace elemental concentrations,clay minerals were analyzed by fusion ICPMS and SEM-EDS.PAAS normalized data plots show U,Th,Rb,Ba,Pb Sr,and large-ion lithophiles enrichment,whereas,Bandai sandstone and Rohini carbonate clays show HREE enrichment with asymmetrical patterns,similar to those reported from the well-established McArthur River,Cigar Lake,and Sue UTUD of Canada.For Rohni carbonate,chondrite-normalized REE data plots revealed M shape REE patterns,ascribed to Gd-Tb-Dy-Ho tetrad effect and anomalous Y,Zr,and Hf concentrations.Owing to HREE incorporation in the clay inter-layers,linear and flattened REE trends were noticed.Flat REE patterns associated with the highly altered chlorite and illite represent negative Eu anomaly related to the dilational nature of the uraninite structure and is suggestive of anoxic conditions.

关键词： Bijawars Sonrai basin clays REE patterns Uranium mineralization

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Constitutive model for overconsolidated clays

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Science China(Technological Sciences) 2008年第2期51卷 179-191页

作者： YAO YangPing HOU Wei ZHOU AnNan Department of Civil Engineering Beihang UniversityBeijing 100083China

Based on the relationships between the Hvorslev envelope,the current yield sur-face and the reference yield surface,a new constitutive model for overconsolidated clays is proposed. It adopts the unified hardening parameter,to which the potential failure stress ratio and the characteristic state stress ratio are introduced. The model can describe many characteristics of overconsolidated clays,including stress-strain relationships,strain hardening and softening,stress dilatancy,and stress path dependency. Compared with the Cam-clay model,the model only re-quires one additional soil parameter which is the slope of the Hvorslev envelope. Comparisons with data from triaxial drained compression tests for Fujinomori clay show that the proposed model can rationally describe overconsolidated properties. In addition,the model is also used to predict the stress-strain relationship in the isotropic consolidation condition and the stress paths in the undrained triaxial compression tests.

关键词： overconsolidated clays current yield surface reference yield surface unified hardening parameter Hvorslev envelope.

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Combined Bearing Capacity of Spudcans on a Double Layer Deposit of Strong-Over-Weak clays

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Journal of Ocean University of China 2019年第1期18卷 133-143页

作者： YIN Qilin DONG Sheng College of Engineering Ocean University of China

An extreme sea storm process can lead to a jack-up rig under the combined loading condition of vertical load(V), horizontal load(H), and moment(M) to have stability problems. This paper presents the analysis of combined bearing capacities of a circular spudcan on layered clays with a strong layer overlying a comparatively weaker layer. Numerical models combined with displacement-based load tests, swipe tests, and constant ratio displacement probe tests are adopted to calculate the uniaxial bearing capacities, failure envelopes in combined V-H, V-M planes, and failure envelopes in a combined V-H-M load space, respectively. A parametric study on the effects of vertical load level V, the layer strength ratio s_(u,t)/s_(u,b), and the hard layer thickness t_1 on the bearing capacities is then performed. Results show that the vertical load level is a key factor that influences the values of H and M and the size of the H-M failure envelope. The existence of the underlying weak clay decreases the bearing capacities in all directions, and the vertical capacity Vult is affected more than the horizontal(H_(ult)) and moment(M_(ult)) capacities based on a single uniform deposit. The influence of the underlying weak clay on H-M failure envelope is mainly shown where H and M are coupled in the same direction. In contrast, little difference is observed when H and M are coupled in opposite directions.

关键词： combined bearing capacity circular spudcan layered clays vertical load level strength ratio hard layer thickness

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Physico-Chemical Characterization of Two Dabou clays with a View to Use Them in the Treatment of Dyeing Wastewater

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Journal of Minerals and Materials Characterization and Engineering 2022年第6期10卷 505-517页

作者： Wilfried Aristide Atsé Marc Marie-Maurice Mélèdge Essi Bi Irié Hervé Gouré Doubi Mahamadou Kamagaté Aké Pierre Aké Alfred Niamien Kouamé Laboratory of Constitution and Reaction of Matter Félix Houphou&#235 t Boigny University Abidjan C&#244 te d’Ivoire Biological Sciences Training and Research Unit Péléforo Gon Coulibaly University Korhogo C&#244 te d’Ivoire Central Analysis Laboratory University of Man Man C&#244 te d’Ivoire

This work falls within the general framework of the valorization of the clays of Ivory Coast in order to propose innovative solutions in the resolution of certain problems related to development such as the depollution of water. Its main objective is therefore to study the physico-chemical properties of two Dabou clays with a view to using them in chemical processes for the treatment of dyeing wastewater. The results of the chemical analysis and the ray diffraction showed that the DAB 1 and DAB 2 samples are clays of the kaolinitic type consisting mainly of kaolinite with 51.17% for DAB 1 against 65.81% for DAB 2 and quartz with respectively 41.76% and 25.8% for DAB 1 and DAB 2. They also contain relatively large amounts of goethite with 9.96% for DAB 1 and 12.8% for DAB 2. The specific surfaces measured in both samples are greater than 25 m2/g. All the results of the physico-chemical characterization, in particular the presence in significant quantity of clay minerals, the presence of iron compounds and the large specific surface area of both samples, allow the conclusion that they can be used in adsorption studies and in the heterogeneous Fenton process for water treatment.

关键词： clays Physico-Chemicals Water Treatment

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Physic, Chemical and Mineralogical Characterizations of clays Used in the Making of Traditional Ceramics in the City of Katiola, C ôte d’Ivoire

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Journal of Minerals and Materials Characterization and Engineering 2023年第4期11卷 81-91页

作者： Isabelle Linda He Grah Patrick Atheba N’guadi Blaise Allou Patrick Drogui My Ali El Khakani Gildas Komenan Gbassi Laboratory of Analytical Sciences and Public Health Training and Research Unit of Pharmaceutical Sciences and Biological University Félix Houphou&#235t Boigny Abidjan C &#244te d’Ivoire Laboraratory of Constitution and Reaction of Matter Unit for Training and Research in the Sciences of the Structures of Matter and Technology University Félix Houphou&#235t Boigny Abidjan C &#244te d’Ivoire Center Water Earth Environment National Institute for Scientific Research Quebec Canada Center Energy Materials and Telecommunications National Institute for Scientific Research Varennes Canada

In C ?te d’Ivoire, traditional ceramics are widely used in the form of pottery. The latter is used to store food, water and cereals. Analyzes (X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), inductive plasma optical emission spectrometry (ICP-OES), scanning electron microscopy (SEM) and analysis thermal gravimetric (ATG)) were carried out to determine the morphology, the chemical, physical and pedological constituents of these raw materials. It appears from this study that the clays used in the Mangoro pottery of Katiola contain silica SiO2, alumina Al2O3 and iron oxide Fe2O3 as well as kaolinite, muscovite, smectite and quartz.

关键词： Ceramics Characterization clays Kaolinite Muscovite Smectite Quartz

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An improved damaging model for structured clays

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Journal of Central South University 2008年第S2期15卷 76-80页

作者：姜岩雷华阳郑刚徐舜华 Department of Civil Engineering Tianjin University

An improved damaging model formulated within the framework of bounding surface for structured clays was proposed. The model was intended to describe the effects of structure degradation due to geotechnical loading. The predictive capability of the model was compared with those of triaxial compression test on Tianjin soft clays. The results show that, by incorporating a new damage function into the model, the reduction of elastic bulk and shear modulus with elastic deformations and the reduction of plastic bulk modulus and shear modulus with plastic deformations are able to be appreciable. Before the axial strain reaches 15%, the axial strain computed from the model is smaller than that from the test under the drained condition. Under the undrained condition, after the axial strain reaches 1%, the axial strain increases quickly because of the complete loss of structure and stiffness; and the result computed from the model is nearly equal to that from the model without the incorporation of the damage function due to less plastic strain under undrained condition test.

关键词： structured clays constitutive relation soil structure bounding surface damage function

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