检索结果-南通市图书馆

Comparison of properties of traditional and accelerated carbonated solidified/stabilized contaminated soils

Journal of Environmental Sciences 2008年第5期20卷 593-598页

作者： LIU Jiangying XU Dimin XIONG Lan Colin HILLS Paula CAREY Kevin GARDNER State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai 200092 China Department of Civil Engineering University of Birmingham Edgbaston Birmingham B15 2TTUnited Kingdom Centre for Contaminated Land Remediation Department of Earth and Environmental Sciences University of Greenwich Chatham Maritime Kent ME4 4TB United Kingdom Department of Civil Engineering University of New Hampshire Durham NH03824 USA

The investigation of the long-term performance of solidified/stabilized （S/S） contaminated soils was carried out in a trial site in southeast UK. The soils were exposed to the maximum natural weathering for four years and sampled at various depths in a controlled manner. The chemical properties （e.g., degree of carbonation （DOC）, pH, electrical conductivity （EC）） and physical properties （e.g., moisture content （MC）, liquid limit CLL）, plastic limit （PL）, plasticity index （PI）） of the samples untreated and treated with the traditional and accelerated carbonated S/S processes were analyzed. Their variations on the depths of the soils were also studied. The result showed that the broad geotechnical properties of the soils, manifested in their PIs, were related to the concentration of the water soluble ions and in particular the free calcium ions. The samples treated with the accelerated carbonation technology （ACT）, and the untreated samples contained limited number of free calcium ions in solutions and consequently interacted with waters in a similar way. Compared with the traditional cement-based S/S technology, e.g., treatment with ordinary portland cement （OPC） or EnvirOceM, ACT caused the increase of the PI of the treated soil and made it more stable during long-term weathering. The PI values for the four soils ascended according to the order： the EnvirOceM soil, the OPC soil, the ACT soil, and the untreated soil while their pH and EC values descended according to the same order.

关键词： solidified/stabilized accelerated carbonation contaminated soil electrical conductivity liquid limit plastic limit plasticity index

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Influence of heating and water-exposure on the liquid limits of GMZ01 and MX80 bentonites

引用

Journal of Rock Mechanics and Geotechnical Engineering 2010年第2期2卷 188-192页

作者： Yuemiao Liu Beijing Research Institute of Uranium Geology Beijing100029China

Bentonite has been considered as a buffer material for embedding canisters with high-level radioactive waste（HLW） in deep geological *** bentonite deposit,located in Xinghe County,Inner Mongolia Autonomous Region,China was proposed as a buffer/backfill material for HLW repository in *** liquid limits of natural Na-bentonite GMZ01 and commercial Na-bentonite MX80,which are previously heated at 80 ℃ and 95 ℃,respectively,and exposed to water for different times are *** is observed that the liquid limit of GMZ01 increases slightly at the beginning,and then decreases as the heating time increases,while the liquid limit of MX80 decreases with the heating *** liquid limits of both GMZ01 and MX80 decrease with increasing water-exposure *** the samples are heated at 80℃and 95 ℃ for several months,the mineralogical composition of GMZ01 does not exhibit evident change,whereas MX80 experiences some *** addition,the chemical composition,cation exchange capacity（CEC） and exchangeable cation of all the samples do not change significantly.

关键词： high-level radioactive waste(HLW) deep geological disposal bentonite heating water-exposure liquid limit

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of Sample Disturbance on Unconfined Compression Strength of Natural Marine Clays

引用

海洋工程：英文版 2003年第3期17卷 407-416页

作者：刘汉龙洪振舜 eotechnical Institute Institute of Geotechnical Engineering

Quantitatively correcting the unconfined compressive strength for sample disturbance is an important research project in the practice of ocean engineering and geotechnical engineering. In this study, the specimens of undisturbed natural marine clay obtained from the same depth at the same site were deliberately disturbed to different levels. Then, the specimens with different extents of sample disturbance were trimmed for both oedometer tests and unconfined compression tests. The degree of sample disturbance SD is obtained from the oedometer test data. The relationship between the unconfined compressive strength q u and SD is studied for investigating the effect of sample disturbance on q u. It is found that the value of q u decreases linearly with the increase in SD. Then, a simple method of correcting q u for sample disturbance is proposed. Its validity is also verified through analysis of the existing published data.

关键词： correcting method degree of sample disturbance liquid limit natural marine clays natural water content oedometer test data unconfined compressive strength

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

On Physical and Mechanical Behavior of Natural Marine Intermediate Deposits

引用

China Ocean Engineering 2005年第1期19卷 111-119页

作者：石名磊邓学钧 Transportation College Southeast University Nanjing 210096 China

Coastal structures may be built on natural sedimentary intermediate grounds, which mainly consist of silty soils and fine sandy soils. In this study, extensive field and laboratory tests were performed on the natural marine intermediate deposits to demonstrate the difference in behavior between natural marine clayey soils and natural marine intermediate deposits. The natural intermediate deposits have almost the same ratios of natural water content to liquid limit as those of the soft natural marine clays, but the former have much higher in-situ strength and sensitivity than the latter. The research results indicate that grain size distributions of soils affect significantly tip resistance obtained in field cone penetration tests. The mechanical parameters of natural marine intermediate deposits are also significantly affected by sample disturbance due to their high sensitivity and relatively large permeability. Unconfined compression shear tests largely underestimate the strength of natural marine intermediate soils. The triaxial consolidated compression shear tests with simulated in-situ confined pressure give results much better than those of uncomfined compression shear tests.

关键词： clayey soils filed tip resistance grain size distributions liquid limit natural marine intermediate deposits natural water content laboratory strength

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Critical State Sedimentation Line of Soft Marine Clays

引用

China Ocean Engineering 2003年第4期18卷 631-640页

作者：洪振舜刘汉龙 CHANG Nien-yin Institute of Geotechnkal Engineering Southeast University Nanjing 210096 China Geotechnical Institute Hohai University Nanjing 210024 China Department of Civil Engineering Center for Geotechnical Engineering Science University of Colorado at Denver Denver CO 80217 USA

The compression behavior responsible for unity sensitivity is very valuable in quantitative assessment of the effects of soil structure on the compression behavior of soft marine sediments. However, the quantitative assessment of such effects is not possible because of unavailability of the formula for the compression curve of marine sediments responsible for unit sensitivity. In this study, the relationship between the remolded state and the conventional critical state line is presented in the deviator stress versus mean effective stress plot. The analysis indicates that the remolded state is on the conventional critical state line obtained at a relatively small strain. Thus, a unique critical state sedimentation line for marine sediments of unit sensitivity is proposed. The comparison between the critical state sedimentation line proposed in this study and the existing normalized consolidation curves obtained from conventional oedometer tests on remolded soils or reconstituted soils explains well the

关键词： conventional critical state line critical state sedimentation line initial water content liquid limit marine sediments ocean wave action remolded state

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Remolded Undrained Strength of Soils

引用

海洋工程：英文版 2003年第1期17卷 133-142页

作者：洪振舜刘汉龙 NEGAMI Takehito Institute of Geotechnical Engineering Southeast University Geotechnical Institute Hohai University Department of Civil Engineering Saga University

Extensive data of undrained shear strength for various remolded soils are compiled to normalize the remolded undrained strength. Remolded soils have a wide spectrum of liquid limits ranging from 25% to 412%. It is found that the remolded undrained strength is a function of water content and liquid limit. Furthermore, a simple index designated as normalized water content w * is introduced for normalizing remolded undrained strength for various soils. The normalized water content w * is the ratio of water content to liquid limit. The relationship between the remolded undrained strength and the normalized water content can be expressed by a simple equation. The new simple equation is not only valuable theoretically for helping in assessing the in situ mechanical behavior, but also useful to ocean engineering practice.

关键词： critical state line liquid limit normalized water content remolded undrained strength water content

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

California Bearing Ratio for Cohesive Soils from Quasi Static Cone Tests

引用

Open Journal of Civil Engineering 2023年第2期13卷 367-387页

作者： Robert Kaweesi Michael Kyakula Kyambogo University Masaka Uganda

The California bearing ratio (CBR) test is the most widely spread method of determining the bearing strength of the pavement material and is fundamental to pavement design practice in most countries. This test is expensive, laborious and time consuming, and to overcome this, Quasi static cone penetrometer machine was fabricated and used to measure the consistency limits (liquid limit-LL, Plastic limit-PL and Plasticity index-PI), which were used to develop an empirical equation to determine CBR. Soil samples were collected and unsoaked CBR, PL, LL and PI were determined according to BS 1377 part 9 and BS 1377-2;1990. Quasi static penetration forces at 20 mm depth of penetration were also determined at consistency limits. It was found that the force of 1020 gf and 60 gf was achieved at a depth of 20 mm at PI and LL respectively. The correlation and regression analysis between consistency limits, and the experimental CBR obtained showed coefficient of determination, R2 = 0.907 between CBR and all the parameters using multiple linear regression analysis (MLRA). The regression equation developed was used together with the relationship developed between the Quasi static Penetration force at consistency limits and the tested consistency limits to come up with the General Empirical Equation. Verification of the formula showed that the correlation can be used accurately to determine the un soaked CBR.

关键词： California Bearing Ratio Quasi Static Consistency limits Plastic limit liquid limit Plasticity Index

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Mineralogical and Geochemical Assessment of Clay Properties of Edda, Afikpo Sub Basin Nigeria for Possible Use in the Ceramics Industry

引用

Journal of Geological Research 2021年第2期3卷 41-52页

作者： J.C.Ike H.N.Ezeh M.O.Eyankware A.I.Haruna Department of Energy and Petroleum Studies Novena UniversityOgume Delta StateNigeria Department of Geology Ebonyi State UniversityAbakaliki Ebonyi State.Nigeria Geo-Moses Consultancy limited.Warri Delta StateNigeria Department of Applied Geology Abubakar Tafawa Balewa UniversityBauchiNigeria

Clay samples from selected part of Edda were analyzed to identify the clay mineral types present,their chemical and physical properties with a view to appraising their industrial suitability as ceramic *** mineralogical and geochemical analyses were done using the principles of X-Ray diffraction and X-ray fluorescence respectively.A total of seven clay samples were used for the study,other tests such as plasticity,bulk density,shrinkage,loss on ignition(LOI)and water absorption capacity was carried out to determine the amount of water absorbed under specified *** basic industrial properties assessment showed that more than 70%of the clays are *** clays exhibited low to moderate plasticity,moderate shrinkage and bulk density,low to moderate values of both loss on ignition and water absorption *** clays are buff to yellowish in *** results of x-ray fluorescence revealed that the mean concentration of major oxide in the clays is shown as follows:SiO_(2)(62.78%),Al_(2)O_(3)(20.25%),total Fe(6.09%),CaO(0.56%),MgO(3.21%),Na_(2)O(0.47%),K_(2)O,(1.44%)and TiO_(2)(0.52%).The samples have high silica content,low alumina and low oxide *** results of x-ray diffraction revealed that kaolinite is the dominant clay mineral with illite and montmorillonite occurring in subordinate amounts,while quartz and feldspar are the non-clay components *** characteristics of the clays for each parameter were compared with industrial *** properties are appropriate for the Afikpo clays to be useful in the manufacturing of ***,since the silica content of the clays is high further beneficiation is recommended.

关键词： X-ray Mineral liquid limit Plastic limit Industrial standard Atterberg limit

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geotechnical Identification and Classification of Soils as Flexible Pavement Subgrade of the Section Fongo Tongo-Melong

引用

Journal of Geoscience and Environment Protection 2020年第11期8卷 183-200页

作者： François Ngapgue Willy Chance Guimezap Kenou Jules Hermann Keyangue Tchouata Vladimir Willianov Keubou Tatapzia Yannick Mbeuteu Mbakop Research Unit of Mechanics and Physical Systems Modeling (UR2MPS) Faculty of Sciences University of Dschang Dschang Cameroon Laboratory of Engineering Industrial Systems and Environment (LISIE) FOTSO Victor University Institute of Technology University of Dschang Dschang Cameroon Laboratory of Environmental Geology Faculty of Sciences University of Dschang Dschang Cameroon Innovation Research Center Entrepreneurship (PRIE) Institut Universitaire de la Cote Douala Cameroon School of Geology and Mining Engineering (SGME) University of Ngaoundere Ngaoundere Cameroon Geotechnique Batiment et Travaux Publics (GEO TP) Douala Cameroon

The present study is inscribed within the framework of the geotechnical characterization of the soils of the Santchou plain, their classification for employment as pavement subgrade, various identification tests were carried out on the samples. The results obtained showed that with a wide range of different grain sizes, the studied soils showed low content in clay grains and dominance of either sand grains or silt grains, this can be explaining how most of these soil are poorly graded. According to the USDA textural classification, the grain size distribution of these soils makes them to be classified as Silty Loam types to Sandy Loam types. Despite of their organic matter content which is less than 10%, according to their respective methylene blue values, the soils studied along the section should be mainly loamy soil of medium plasticity to clayed soil, therefore showing a sensibility of its behavior to variation of water content. That last one is confirmed by the consistency parameters of these soils which show intermediate plasticity to highly plastic. Also, the bearing capacity proposed by these soils at their respective optimum dry densities is relatively small, although most of these experimental CBR values of the studied soils are more important than the ones prescribed by the AASHTO Classification system for A5, A6, and A7 types, and the French Highway Earthworks Manual Classifications system (GTR) for the corresponding A2 and A3 types.

关键词： Soil Classification liquid limit Natural Water Content Plasticity Index Methylene Blue Value Optimum Moisture Content California Bearing Ratio

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：