To see the other types of publications on this topic, follow the link: Plasticity index.
Journal articles on the topic 'Plasticity index'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'Plasticity index.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Chaney, RC, KR Demars, A. Sridharan, HB Nagaraj, and K. Prakash. "Determination of the Plasticity Index from Flow Index." Geotechnical Testing Journal 22, no. 2 (1999): 175. http://dx.doi.org/10.1520/gtj11276j.
Full text
2
Tchakalova, Boriana, and Plamen Ivanov. "Correlation between effective cohesion and plasticity index of clay." Geologica Balcanica 51, no. 3 (2022): 45–49. https://doi.org/10.52321/GeolBalc.51.3.45.
Full textAbstract:
Correlations of engineering properties are a useful tool in geotechnical engineering practice. This paper aims to provide a correlation between the effective cohesion and plasticity index for natural, undisturbed clay soils from the Kozloduy area (NW Bulgaria), based on the results from laboratory tests. It has been demonstrated that there is a strong correlation between the plasticity index and the effective cohesion. The derived regression equation can be used to estimate the effective cohesion as first approximation in preliminary design of engineering projects of Pliocene and Quaternary clays encountered in northwest Bulgaria.
3
Osman, Syed Baharom Syed, Fahad Irfan Siddiqui, and Mohammad Yaakob Behan. "Relationship of Plasticity Index of Soil with Laboratory and Field Electrical Resistivity Values." Applied Mechanics and Materials 353-356 (August 2013): 719–24. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.719.
Full textAbstract:
Borehole sampling and laboratory soil characterizations provide accurate engineering properties, yet it is time-consuming and expensive. Geo-electrical survey is an attractive tool for delineating subsurface properties without soil disturbance. The primary objective of the current research work is to investigate the relationship between electrical resistivity and plasticity index of soil. The results from electrical resistivity tests (field and laboratory) and Atterburg limit tests were analyzed to understand the relationship between electrical resistivity and plasticity index of soil. Plasticity index have a significant correlation with field and laboratory electrical resistivity values for all soil samples. It was found that silty sand soil samples are characterized by higher plasticity index and lower resistivity values whereas sandy soil samples have lower plasticity index and higher resistivity values.
4
Srie Gunarti, Anita Setyowati. "ATTERBERG LIMIT PADA TANAH LEMPUNG YANG DISTABILISASI DENGAN NATRIUM KARBONAT." Bentang : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil 1, no. 2 (2013): 15–21. https://doi.org/10.33558/bentang.v1i2.400.
Full textAbstract:
Soil properties often have inadequate to sustain a construction or building, such as compressibility, permeability, and plastisitasnya. One method of stabilization of chemical soil stabilization as an effort to increase strength, reduce the reduction, and improving physical and mechanical properties of others. In this study, conducted observations of Clay Soil Plasticity Index values are mixed with Natrium Carbonate (Na2CO3) with a composition of 1 g of Na2CO3 for 1 kg of soil clays and brooded for 24 hours at the Laboratory of Soil Mechanics Unisma Bekasi. Then tested the limits of consistency (Atterberg Limits) to obtain the value of liquid limit and plastic limit so we get the soil plasticity index. The test results concluded that the original soil physical properties soil plasticity index value of 45.07%. Land included in the type CH (Inorganic clay with high plasticity), and within the category of very soft clay and somewhat sensitive. Soil mixed with Natrium Carbonate has a plasticity index value of 27.553%. Land included in the type of inorganic silt or organic clay with moderate to high plasticity. Natrium Carbonate is successful in reducing the plasticity index value of the land, so that the physical properties of soil clays for the better. Keywords: Natrium Carbonate, Soil clays, Chemical Stabilization, Plasticity Index
5
Odewumi, Shola C. "EVALUATION OF GEOTECHNICAL PROPERTIES OF SOILS AT BRITISH – AMERICAN AREA, JOS-PLATEAU, NORTHCENTRAL NIGERIA." Journal CleanWAS 8, no. 2 (2024): 93–97. https://doi.org/10.26480/jcleanwas.02.2024.93.97.
Full textAbstract:
This research aimed to determine the geotechnical properties of soils along British American area, Jos,Northcentral Nigeria. A total of five (5) soil samples were collected at depth of 1.5 m and were subjected togeotechnical tests: moisture content, Specific gravity, liquid limit, plastic limit, linear shrinkage and plasticityindex. The moisture content of the soil ranges from 10.7 to 21.2% while specific gravity of soil ranges from2.65 to 3.10. The liquid limit ranges from 35.24 to 38.5 %, plastic limit value varies from 15.76 to 24.07%plasticity index value ranges from 11.17 to 20.24% and linear shrinkage value of 6.69 to 7.54%. Cassagrandeplasticity chart indicate that all the soil samples plot within CL-Group. The value of specific gravity (2.65 to3.10) shows that the soil samples in the area can be categorized into sand, silty sand and soil with mica oriron. Based on the value of liquid limit, the degree of expansion was categorized into medium degree ofexpansion (35-50%) while the danger of severity zone was identified as marginal (35 to 50 %). Based on theplasticity index value, two (2) danger of severity zones were identified as non-critical with plasticity indexvalue of <12% and marginal with plasticity index of 12 to 23%. The degree of expansion was classified as lowwith plasticity index value of <12% and medium with plasticity index value of 12 to 23%. The value of linearshrinkage indicates non-critical danger of severity zone with value of <15% and the degree of expansion is low. Two (2) plasticity index zones of medium plastic and highly plastic were identified while two (2) swelling potential zones were classified as low with plasticity index value of 0 to 15 % and medium with plasticity index value of 15 to 25%. The soil type in the study area can be classified into two silt clay with plasticity index of 7-17% and clay with plasticity index of > 17%
6
Zhang, Wen Li, and Jian Guo Jin. "A Method for the Determination of Ceramic Paste Plasticity." Advanced Materials Research 177 (December 2010): 594–97. http://dx.doi.org/10.4028/www.scientific.net/amr.177.594.
Full textAbstract:
The forming property of clay is one of the most important processing properties. Mineral composition and plasticity of various kinds of clays were determined, and the relations among yield value, degree of deformation and mineral composition were analyzed. According to the relations between acting force and distance between colloidal particles in clay-water system, the determining method of plasticity index II was set up, and compared with the traditional determining methods. The results show that the determining method of plasticity index II can better reflect the effect of clays on the plasticity of body by the comparison of determined values in different ways with the actual plasticity of body, the plasticity indexes II of different kinds of clays have relations of summation with the plasticity of body. The forming property of clay can be reasonably evaluated by plasticity index II.
7
Nakase, Akio, Takeshi Kamei, and Osamu Kusakabe. "Constitutive Parameters Estimated by Plasticity Index." Journal of Geotechnical Engineering 114, no. 7 (1988): 844–58. http://dx.doi.org/10.1061/(asce)0733-9410(1988)114:7(844).
Full text
8
Wu, Chengwei, and Linqing Zheng. "A general expression for plasticity index." Wear 121, no. 2 (1988): 161–72. http://dx.doi.org/10.1016/0043-1648(88)90040-3.
Full text
9
Büttner, J., and B. Simeon. "Index 2 DAEs in Plasticity Theory." PAMM 1, no. 1 (2002): 43. http://dx.doi.org/10.1002/1617-7061(200203)1:1<43::aid-pamm43>3.0.co;2-y.
Full text
10
Firincioglu, Bekir Salih, and Huriye Bilsel. "Unified Plasticity Potential of Soils." Applied Sciences 13, no. 13 (2023): 7889. http://dx.doi.org/10.3390/app13137889.
Full textAbstract:
Soil plasticity characteristics are of great importance to practicing engineers and academics due to their wide range of applications mainly concerning settlement and soil strength assessment and volume change behavior. Therefore, assigning a plasticity value to soils under any discipline concerning soil engineering is critical. This is almost always carried out by determining plasticity index of soils in geotechnical engineering. However, overall plasticity characteristics of soils might not be reflected by using plasticity index alone. This research demonstrates the creation of a single model to define the plasticity potential of soils by using multivariate statistical techniques. Various soil properties including mineralogical features were integrated into the model. Some of these properties explained the soil plasticity positively and some of them negatively. The difference in plasticity characteristics of clayey soils were also identified. The model is created to be applied simply by using only two inputs for worldwide suitability. A single expression and two different scaled charts are proposed along with six ranges of plasticity potential for easy and broader application. This model proved that plasticity index alone needs refinement in practical applications.
11
Zhan, Gao Feng, Zhen Gao, Fu Zhu, and Wei Zhi Dong. "Experimental Research on Influencing Factors of Remolded Fine Soil Strength." Advanced Materials Research 1049-1050 (October 2014): 321–24. http://dx.doi.org/10.4028/www.scientific.net/amr.1049-1050.321.
Full textAbstract:
In order to research on the influence law of fine soil strength affected by plasticity index, moisture content,compactness, the unconfined compressive resilient modulus of the soil is as the evaluation index of remolded soil strength. Three fine soils with different plasticity index are selected from field. Test scheme was obtained with the method of orthogonal design. By the static molding method,the soil sample was compacted from the prescriptive moisture content and compactness. The unconfined compressive resilient modulus of the soil sample were tested respectively. The experiments show that sort of influencing factors is plasticity index, moisture content, compactness. With the increase of plasticity index, remolded soil strength increases and increasing extent is significantly large. With the increase of moisture content, remolded soil strength decreases and increasing extent is larger. With the increase of compactness, soil subgrade strength increases, but increasing extent is significantly small.The exponential function is adopted for multiple nonlinear fitting. The relationship between the unconfined compressive resilient modulus and plasticity index, moisture content, compactness is obtained and shows a good correlation.
12
Cáceres, J. R., J. R. Pineda-Rodríguez, and J. P. Rojas-Suárez. "Analysis of the ratio between the plasticity of clay and the expansion capacity by changes in humidity and temperature." Journal of Physics: Conference Series 2139, no. 1 (2021): 012010. http://dx.doi.org/10.1088/1742-6596/2139/1/012010.
Full textAbstract:
Abstract Clay is a cohesive material that varies in volume due to changes in humidity and temperature. Its behavior is studied with physical and geotechnical characterization of the material. The experimental analysis of the expansiveness of clays is related to plasticity, which depends on the expansive minerals it contains. The objective is to analyze the relationship between the plasticity index and the expansion capacity due to changes in humidity and temperature; various types of clay from San José de Cúcuta, Colombia, were studied. Liquid limit and plastic limit were analyzed with which the plasticity index was determined. The test tube free expansion and calcination were carried out at 1000 °C to determine the volumetric change due to humidity and temperature, respectively. The clays with plasticity index of 10% - 20% presented expansion by humidity of 5% - 10% and by calcination of 0% - 10%, which indicates low expansion; while the clay with plasticity index of 20% - 40% presented expansion by moisture of 20% - 50% and by calcination of 25% - 50%, which indicates moderately high expansion. The results show that there is a relationship between plasticity index and the expansion capacity due to changes in humidity and temperature.
13
Pawlus, P., W. Zelasko, R. Reizer, and M. Wieczorowski. "Calculation of plasticity index of two-process surfaces." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 231, no. 5 (2016): 572–82. http://dx.doi.org/10.1177/1350650116664826.
Full textAbstract:
This paper presents the method of plasticity index calculation of isotropic two-process surfaces on the basis of index developed by Greenwood and Williamson for random surfaces of Gaussian ordinate distribution. This method was applied to computer generated isotropic two-process textures. The proposed plasticity index of two-process surface was compared with that of plateau surface and of the whole surface calculated by traditional manner. It was shown that plasticity index and generally the contact properties of two-process surfaces depended not only on plateau but also in a smaller degree on valley roughness. The method of estimation of summit radius of plateau surface from the analysis of two-process surface was presented too.
14
Ceriales, Rico Jay S. "Characterization of Semi-Processed Rubber (Hevea brasiliensis Willd.) Treated With Different Coagulants." International Journal of Research and Innovation in Applied Science X, no. III (2025): 550–67. https://doi.org/10.51584/ijrias.2025.10030040.
Full textAbstract:
A study was conducted to characterize the semi-processed rubber treated with different coagulants and to determine the relationship of physical and chemical properties of semi-processed rubber as treated with different coagulants.The different coagulants significantly influenced the characteristics of coagula such as pH reading of acid solution, pH reading of coagula, rate of coagulation, fresh weight and % DRC recovery. The different coagulants also significantly influenced the physical properties of semi-processed rubber such as Initial Plasticity(Po), Plasticity Retention Index, Color Index, Mooney Viscosity and % Dirt Content. The different coagulants did not significantly influence the chemical properties of semi-processed rubber such as % Nitrogen Content and % Volatile Matter, but significantly influenced the % Ash Content. No significant correlation between physical properties of semi-processed rubber such as Initial Plasticity(Po), Plasticity Retention Index, Color Index, and % Dirt Content and chemical properties of semi-processed rubber such as % Nitrogen Content and % Volatile Matter, but color index is positively correlated with % ash content of semi-processed rubber.
15
Mazur, Oleksandr, and Olena Mazur. "DISTINCTIONS OF LEGUMINUOUS GROPS FOR PLASTICITY AND STABILITY OF COMMERCIAL INDICATORS." Agriculture and Forestry, no. 1 (12) (April 25, 2019): 69–86. https://doi.org/10.37128/2707-5826-2019-1-6.
Full textAbstract:
The article presents the results of research on the adaptive value of legumes (legumes, soybeans) of varieties of specimens for their reaction to improving the conditions of cultivation. The best grades of plasticity of the selection index (the mass of seed from the plant / the number of beans per plant) of common beans were sorted specimens - UD0300658, UD0302746, UD0300856, UD0300565. According to the selection index (weight of plant seeds / number of seeds per plant), the best ones were: UD0300658, UD0300232, UD0302256, UD0302683, UD0303533 and UD0302642 in which the coefficient of plasticity was more than one. According to the selection index (number of seeds per plant / number of beans per plant) UD0302746 and UD0300232 appeared high-plasticity. Highly-populated beans per plant were sorted specimens of soybeans - UD0202201, UD0202557, UD0202566. According to the number of seeds per plant, the best varieties of soybeans were: UD02025661, UD0202557, UD0202563, UD0202201, UD0202458, UD0202468, in which the coefficient of plasticity is above unit. According to grain yield, high- plasticity varieties of soybeans were found in which the coefficient of plasticity was higher than the unit: UD0202566 – 1,1; UD0202557 – 1,5; UD0202563 – 1,1; UD0202201 – 1,1. Highly- plasticity. masses of 1000 seeds were sorted specimens – UD0202557, UD0202563, UD0202201, UD0202529, UD0200983, and coefficients of variation were low and varied from 6,5 to 9,6%. Highly- plasticity according to the selection index (mass of seed from a plant / quantity of beans per plant) were sorted specimens: UD0200983 – 1,3; UD0202201 – 1,3; UD0202563 – 1,5; UD0202557 – 1,6. By the coefficient of variation, these varieties were characterized by low to medium variability (V = 9-11%).
16
Diana, Willis, Edi Hartono, Anita Widianti, and Rinda Apriliani. "The Effect of Substituting Eggshell Powder on the Consistency Limits of Lime-Stabilized Clay." MEDIA KOMUNIKASI TEKNIK SIPIL 27, no. 2 (2021): 232–41. http://dx.doi.org/10.14710/mkts.v27i2.33885.
Full textAbstract:
This study aimed to investigate the use of eggshell powder (ESP) to replace lime in soil-lime stabilization. Calcite was found in significant quantities in the ESP. The soil consistency limits are commonly used to evaluate the workability and estimate the mechanical properties of stabilized soil. The pH test was used to determine the initial Consumption of Lime (ICL), which was 8%. Several test variations were performed to investigate the effect of ESP replacement on the consistency limits of soil-lime stabilization soil, substituting ESP for a portion or all of the lime content required for stabilization. Soil-lime stabilization decreases the liquid limit, plasticity index, and linear shrinkage of the soil. With lime stabilization, the plasticity index reduced by 60% - 55%. The more lime content was substituted with ESP The greater the plasticity index. However, when all lime content was replaced with ESP, the soil plasticity index reduced by 29% compared to untreated soil. The shrinkage limit of untreated soil was 10.43%; after stabilization with 8% eggshell powder, the shrinkage limit increased by 26% to 13.22%. The shrinkage ratio, volumetric shrinkage, and linear shrinkage, on the other hand, are not significantly reduced. Lime types (hydrated lime and quicklime) have nearly identical behavior in terms of changes in soil plasticity. The eggshell powder can be used for soil stabilization and can affect soil plasticity. However, the changes in plasticity are not as significant as those seen with lime stabilization.
17
Yi, Wen, Yong He Wang, Zi Xin Xie, and Chang Zi Qu. "The Research on the Liquid Plastic Limit of Completely Weathered Granite Improved Soil." Advanced Materials Research 639-640 (January 2013): 700–703. http://dx.doi.org/10.4028/www.scientific.net/amr.639-640.700.
Full textAbstract:
In this paper, we studied mechanics characteristic of whole weathered granite improved soil. We analysesed its changes of fluid plasticity index before and after improvement in different compaction condition. We improved the full weathering granite by adding different proportion of lime and cement. We analysised the changes of liquid limit and plastic limit of improved soil in the different mixed ratio condition and we got the conclusion that the improved soil plasticity index decreased with lime or cement dosage increases, also changed over time. Improved soil liquid limit, plastic limit and plasticity index changed with the addition of lime, cement dosage changes exponentially.
18
Zhao, Q., and F. E. Talke. "Plasticity Index for Contact Between a Head and a Disk With Crater-Shaped Laser Bumps." Journal of Tribology 122, no. 1 (1999): 269–73. http://dx.doi.org/10.1115/1.555353.
Full textAbstract:
A plasticity index formula for the contact between a flat plane and crater-shaped laser bumps is derived based on contact analysis of a circular cylinder in contact with a flat plane. The plasticity index for “cylinder-on-plane” contacts differs by a scale factor from that for “sphere-on-plane” contacts while the criterion for the deformation mode is the same for both types of contacts. For a wide range of typical head/disk interface conditions, the plasticity index for “cylinder-on-plane” contacts is found to be smaller than that of “sphere-on-plane contacts.” [S0742-4787(00)03501-3]
19
Silmi Surjandari, Niken, Raden Harya Dananjaya, and Ely Jauharotus S. "The effect of egg shell powder on the compression strength of fine-grained soil." MATEC Web of Conferences 195 (2018): 03011. http://dx.doi.org/10.1051/matecconf/201819503011.
Full textAbstract:
High plasticity clay has several problems including a high plasticity index and low bearing capacity. Stabilization of high plasticity clay is still extensively explored, especially for a low-cost and easily obtainable material. The purpose of this research is to study the effect of eggshell powder (ESP) on high plasticity clay. This research uses a soil sample obtained from Jenggrik Village, Ngawi Regency, East Java. Furthermore, the problematic soils at liquidity index of 0 - 1.25 are mixed with the ESP in various percentages, i.e. 0%, 10%, 15%, 20%. Several laboratory tests have been conducted to examine the effects of the mixtures, such as index properties, unconfined compressive strength and Scanning Electron Microscopy (SEM). The result indicates that the liquidity index affects the soil stabilized by ESP. SEM test results show that the soil structure changes, it becomes dense on a mixture containing 10% ESP. The conclusion of this research is that the higher the liquidity, the lower the strength.
20
Ibrahim, Norlia Mohamad, Nur Liza Rahim, Roshazita Che Amat, Shamshinar Salehuddin, and Nor Afzan Ariffin. "Determination of Plasticity Index and Compression Index of Soil at Perlis." APCBEE Procedia 4 (2012): 94–98. http://dx.doi.org/10.1016/j.apcbee.2012.11.016.
Full text
21
Nguyen, Thi Luyen, Van Duong Mai, and Thu Ha Nguyen. "Effects of sodium humate and sodium lignosulfonate additives on the plasticity of 3D printing materials for ceramic tableware production." Ministry of Science and Technology, Vietnam 66, no. 6 (2024): 9–12. http://dx.doi.org/10.31276/vjst.66(6).9-12.
Full textAbstract:
Plasticity is an important physical property of ceramic materials. It demonstrates the ability to shape in traditional ceramic production - made from a mixture containing clay, kaolin-gypsum-quartz. In this article, the effects of sodium humate and sodium lignosulfonate additives on plasticity - characterised by the plasticity index and green flexural strength of 3D printing materials for ceramic tableware production are examined. The results show that when adding sodium humate content from 0.1-0.5 wt.%, the green flexural strength of the mixture increases while the plasticity index does not change significantly compared to the sample without additives. When adding sodium lignosulfonate additive from 0.2-0.9 wt.%, the green flexural strength of the mixture also tends to gradually increase and begins to decrease when increasing the additive content to 1.0 wt.%, the plasticity of the mixture increases after adding 0.2 wt.% sodium lignosulfonate but then tends to decrease with increasing content. Within the testing content range, both additives increase the green flexural strength and do not change the plasticity index much, but the green flexural strength of the mixture when using sodium humate increased higher than sodium lignosulfonate.
22
Dwiretnani, Annisaa. "STABILISASI TANAH LEMPUNG MENGGUNAKAN KERIKIL UNTUK MENINGKATKAN DAYA DUKUNG (CBR) DI LABORATORIUM SEBAGAI BAHAN TIMBUNAN." Jurnal Talenta Sipil 1, no. 1 (2018): 41. http://dx.doi.org/10.33087/talentasipil.v1i1.5.
Full textAbstract:
Clay is a type of soil that has a high shrinkage when the change in water content. Construction of roads built on clay soil often damaged, eg cracked or bumpy roads would be damaged so that road before reaching the age of the plan. This study analyzes the behavior of clay in the area of Mendalo Darat, Provinsi Jambi, get maximum soil density and optimum moisture content with the addition of gravel 10%, 20%, 30% and 40%, then tested in the from of nature of the soil, the California Bearing Ratio (CBR). The results, according to the Unified Soil Classification System (USCS) methods. The addition of gravel will cause the properties of the soil Liquid Limit (LL) decreased with Plastic Limit (PL) decreased so that the Plasticity Index (PI) decreased. The addition of gravel will be working actively on the CBR test. From the test results obtained, clay that is stabilized with gravel on variations of 10%, 20%, 30% and 40% indicate an increase in crayying capacity soil and significant decrease in plasticity index. On the gravel mixture of 40% there is significant increase in carrying capacity of 11,90% of power support for the original soil, and on the gravel mixture of 40% also decreased index plasticity of 1,21 % of the original soil plasticity index. The smaller the plasticity index, the carrying capacity is getting bigger.Keywords: clay, stabilized, CBR
23
Dianty, Marelianda Al, and Wei Wu. "Prediction of Soil Compression Index in Teziutlán, Mexico." Applied Mechanics and Materials 897 (April 2020): 124–28. http://dx.doi.org/10.4028/www.scientific.net/amm.897.124.
Full textAbstract:
One of the important soil materials for the evaluation of settlement due to consolidation of soil clay is the compression index (Cc). The assessment of its value through laboratory testing is usually time consuming and expensive. Hence to find the most appropriate model prediction, the paper is examined the compression index comparison with soil plasticity material (water content, liquid limit, plasticity index). The analysis is used by multiple regression analysis and some performance indicators such as Coefficient of Determination (R2), Index of Agreement (IA), Prediction Accuracy (PA), Normalized Absolute Error (NAE) and Root Mean Square Error (RMSE). The result identified the proposed model by Skempton’s, Sidharan, Nagaraj’s and Hough’s are suitable for the compression index (Cc) equation model. Another essential point, the research is found error measurement for soil plasticity index properties. Thus, this prediction model is useful to develop a preliminary assessment of the settlement of structures and carry out suitable action for landslides in Teziutlan, Mexico.
24
Mikova, Marina N., and Evgeniya N. Akbulyakova. "A study of clay soil deformability over time." Vestnik MGSU, no. 12 (December 2020): 1654–62. http://dx.doi.org/10.22227/1997-0935.2020.12.1654-1662.
Full textAbstract:
Introduction. The study is focused on the process of clay soil deformation over time, provided that this soil, featuring varied liquidity index values, is exposed to constant load. The consolidation process is slow; it can run for years or decades in clay soils. Long-term deformations of clay soils must be taken into account in the course of design and construction of buildings and structures, on the one hand, and in the process of analyzing settlement rates and maximal settlement values for foundation beds, on the other hand.
 Materials and methods. Semi-solid, low-plasticity, high-plasticity, very high plasticity, and free-flowing clay samples were used in the study. The parameters under research encompass relative and absolute deformation of soil samples over time. These parameters are dependent on the soil liquidity index value. All laboratory tests were carried out in compression machines, and tested samples were exposed to constant load. The experimental data thus obtained were supplemented by the information provided M.A. Koltunov.
 Results. Values of absolute deformations and time-to-relative deformation ratios were obtained for clays having different liquidity index values. The analysis of the time-to-relative deformation curves shows that deformations develop over time at different rates depending on the liquidity index of clay soils. An increase in the value of the liquidity index boosts the values of initial deformations and deformation rates.
 Conclusions. The equations, derived in the course of the study, allow to analyze the deformation of semi-solid, low-plasticity, high-plasticity, very high plasticity, and free-flowing clays for various time ranges depending on the initial clay liquidity index. The accuracy of the approximation of these equations varies from 0.801 to 0.993, which makes it possible to characterize these dependences as high quality mathematical models.
25
HABMON, TEMOUA, Alexis MOUANGUE NANIMINA, YOUDJARI DJONKAMLA, and KINE OUINRA. "Effects of Grewia Bicolor Fiber on the Thermomechanical Properties of Earthen Bricks for Sustainable Habitat Construction." Asian Journal of Physical and Chemical Sciences 13, no. 3 (2025): 68–82. https://doi.org/10.9734/ajopacs/2025/v13i3252.
Full textAbstract:
The context of sustainable development, which forces humans to protect the planet, imposes in its objectives to move towards the use of locally accessible materials in the field of construction. The objective of the present research work is to study the effect of Grewia bicolor fiber content on the properties of adobes. Specifically, this involves measuring the compressive and flexural strengths, thermal resistance, conductivity and effusivity of adobes. In this regard, we carried out geotechnical, physical, chemical, mineralogical characterization of soils taken from Mayo Kebbi Est region especially from Fianga Lengoua 1, Fianga Lengoua 2, Bongor, Moulkou, and Guelendeng and from Loumia in Chari Baguirmi region. Various methods and means of identification of soils have been used, including geotechnical, chemical and mineralogical analyzes. According to the geotechnical characterization of soils, Fianga Lengoua 1 soil is a sandy-silt-loam with plasticity index of 18%, Fianga Lengoua 2 soil is a clay-sandy with a plasticity index of 26%, Bongor soil is clayey with plasticity index of 23%, Moulkou soil is clay-sandy-loamy with plasticity index of 17% and Guelendeng soil is clay-sandy-loamy with plasticity index of 20%; in Chari Baguirmi, Loumia soil is clay-sand with plasticity index of 17%. These results indicate that the six samples are soils of type A2 except Fianga Lengoua 2 soils of type A3. Physicochemical analysis results show a pH value greater than 6 for the six samples. They are aluminosilicates. Oraganic materials presents in the samples are less than 2%. The results of these characterization indicate that Fianga Lengoua 1 soil is suitable for the formulation of raw earth block which has 36% clay and it is in ideal zone of the soils according to texture triangle but the five others soils are appropriate for hydraulic lam.
26
Wida, Waode Asryanti, Azwar Maas, and Junun Sartohadi. "Pedogenesis of Mt. Sumbing Volcanic Ash above The Alteration Clay Layer in The Formation of Landslide Susceptible Soils in Bompon Sub-Watershed." Ilmu Pertanian (Agricultural Science) 4, no. 1 (2019): 15. http://dx.doi.org/10.22146/ipas.41893.
Full textAbstract:
Numerous researches on landslides have been carried out by many researches. However, studies on soil physical properties related to landslides potential in volcanic area are still rare. The objective of this study was to examine the effect of soil physical properties on landslides potential. To collect the soil sample, sampling area method was applied. The soil type used in this study was the residual soil. The values of clay liquid limit, plasticity limit, plasticity index, water content, COLE index were used to measure the physical properties of the soil. Organic material was used as the supporting data. The results showed that the soil in the command area showed high value of clay which exceeded 50%. Such high level conditions in each profile affect the liquid limit; plasticity limit, plasticity index, water content, COLE index and organic material. Based on the results, it can be concluded that residual soils with significantly high clay values illustrated the risk of landslide fields formation in Bompon sub-watershed. The clay soil layer was the controlled factor of soil movement.
27
C., Amos-Uhegbu, and J. John U. "Geophysical and Geotechnical Evaluation of Erosion Sites in Ebem-Ohafia Area of Abia State, Southern Nigeria." Advances in Research 10, no. 3 (2017): 1–14. https://doi.org/10.9734/AIR/2017/31538.
Full textAbstract:
This work is an integrated evaluation of the external and internal structures of an erosion site in Ebem-Ohafia area of Abia state, Nigeria using the geophysical and geotechnical methods of investigation. The geophysical method used was the electrical method which employed the Schlumberger electrode configuration with maximum half current electrode spacing of AB/2 = 165 m, and 4 vertical electrical sounding (VES) data were acquired. Results show that the top soil resistivity values vary from 58.8 Ωm – 886.6 Ωm, that of the weathered layer vary from 100 Ωm - 3586.6 Ωm; and the maximum depth of each sounding location varies from 33.4 m - 59.6 m. In the geotechnical approach, four soil samples from each of the sounding locations were used for the study. The geotechnical results show that the soil has relatively high clay content with plasticity index ranging from 6.0% -12.0%. The consistency limits of the soils generally indicate low to medium plasticity. The natural moisture content varies from 5.3% to 9.4%; while the liquid limit ranges from 27.4% - 41.1%. By using the resistivity values together with plasticity index in the evaluation, it is established that the higher the value of layer resistivity, the lower the plasticity index of the layer. This indicates that the vicinity of VES 1 is the most erosion-prone locality in the study area, while the vicinity of VES 4 remains stable. The plastic index of the soils within the area is adjudged to be of low to medium plasticity (,20%); hence, the soils are expected not to exhibit high cohesion potential. It was however concluded that geomorphologic and anthropogenic factors are the major causes of the erosion menace in the area. Subsequently, good agricultural practices and regulars monitoring of the area is recommended.
28
Liu, Han Bing, Jing Wang, Chun Li Wu, and Kai Feng. "Correlation Analysis on Frost Heaving Ratio of Subgrade Soil and Plasticity Index under Freeze-Thaw Cycles." Advanced Materials Research 255-260 (May 2011): 1171–75. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.1171.
Full textAbstract:
Three kinds of subgrade soils with different plasticity index are selected from seasonally frozen soil region. Frost heaving ratio of volume and height was performed on the samples exposed to 0 to 8 times closed-system freeze-thaw cycles. The results show that concerning the same kind of soil, the frost heaving ratio increases with the number of freeze-thaw cycles; Frost heaving ratio increases with plasticity index under the same number of freeze-thaw cycles. Multiple nonlinear fitting is adopted for test data. The relationship between frost heaving ratio and plasticity index, freeze-thaw cycles is obtained and shows a good correlation. The relation can provide useful reference for subgrade design and construction in seasonally frozen soil region.
29
Soewignjo Agus Nugroho and Syawal Satibi. "Perubahan Plastisitas dan Permaebilitas Tanah Lempung (CH) terhadap Penambahan Semen dan Limbah BAFA." Jurnal Teknologi dan Rekayasa Sipil 1, no. 1 (2022): 1–9. http://dx.doi.org/10.56208/jtrs.v1.i1-hal1-9.
Full textAbstract:
High Plasticity Clay (CH) soils have poor material characteristics, such as large shrinkage which results in high plasticity so that soil improvement is required using cement and coal waste is added (bottom ash and fly ash). The purpose of adding the mixture is to see its effect on changes in the properties of soil plasticity and permeability. BAFA variation is 4%, 8%, 12% and 16%, cement variation is 3% and 5%. Atterberg limit and soil permeability testing is carried out on ripening day 0.7 and 28 days. The test results show changes in the value of Plasticity Index (Plasticity Index) or the value of PI and the value of k (constant) in the soil permeability test that has been added to the mixed material. Based on the results of the atterberg limit test, there was a decrease in the value of the soil plasticity index (PI) and the liquid limit value (LL) while the plastic limit (PL) experienced an increase in value along with the increase in cement content and BAFA waste, while in the soil permeability test it was known that the original soil sample was more difficult to penetrate water compared to soil samples that have been mixed with cement and BAFA waste.
30
Sridharan, A., and H. B. Nagaraj. "Compressibility behaviour of remoulded, fine-grained soils and correlation with index properties." Canadian Geotechnical Journal 37, no. 3 (2000): 712–22. http://dx.doi.org/10.1139/t99-128.
Full textAbstract:
Correlating engineering properties with index properties has assumed greater significance in the recent past in the field of geotechnical engineering. Although attempts have been made in the past to correlate compressibility with various index properties individually, all the properties affecting compressibility behaviour have not been considered together in any single study to examine which index property of the soil correlates best with compressibility behaviour, especially within a set of test results. In the present study, 10 soils covering a sufficiently wide range of liquid limit, plastic limit, and shrinkage limit were selected and conventional consolidation tests were carried out starting with their initial water contents almost equal to their respective liquid limits. The compressibility behaviour is vastly different for pairs of soils having nearly the same liquid limit, but different plasticity characteristics. The relationship between void ratio and consolidation pressure is more closely related to the shrinkage index (shrinkage index = liquid limit - shrinkage limit) than to the plasticity index. Wide variations are seen with the liquid limit. For the soils investigated, the compression index relates better with the shrinkage index than with the plasticity index or liquid limit.Key words: Atterberg limits, classification, clays, compressibility, laboratory tests.
31
Hadoush, Hikmat, Toru Sunagawa, Kazuyoshi Nakanishi, and Mitsuo Ochi. "Somatosensory cortical plasticity after toe-to-index transfer." NeuroReport 23, no. 17 (2012): 1000–1005. http://dx.doi.org/10.1097/wnr.0b013e32835a649e.
Full text
32
Rosén, B. G., and T. R. Thomas. "Relationship of the plasticity index to machining parameters." International Journal of Machine Tools and Manufacture 41, no. 13-14 (2001): 2061–69. http://dx.doi.org/10.1016/s0890-6955(01)00072-4.
Full text
33
Wang, Jing, Xiao Long Qu, Chun Li Wu, and Yi Ming Xiang. "Experimental Research on Shear Strength of Subgrade Soil and Plasticity Index under Different Freeze-Thaw Cycles." Applied Mechanics and Materials 256-259 (December 2012): 43–47. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.43.
Full textAbstract:
Three different plasticity index subgrade soils are selected from seasonal frozen soil area. Triaxial compression test under different confining pressures are executed on the samples exposed to 0 to 7 times closed-system freeze-thaw cycles. The conclusion gotten is that to the same kind of soil under the same freeze-thaw cycles, the shear strength increases with confining pressure; Shear strength with the same confining pressure decreases with the number of freeze-thaw cycles; With the same confining pressure and the same freeze-thaw cycles, shear strength increases with the plasticity index. Exponential function is adopted for multiple nonlinear fitting on the test results. The relationship between shear strength and confining pressure, plasticity index, freeze-thaw cycles is obtained and shows a good correlation.
34
Syamdiofa, Teuku Julis, Munirwansyah Munirwansyah, and Renni Anggraini. "PENGARUH KAPUR SEBAGAI STABILIZING AGENT TERHADAP INDEKS PLASTISITAS DAN KUAT GESER LEMPUNG EKSPANSIF MEUNASAH RAYEUK." Jurnal Arsip Rekayasa Sipil dan Perencanaan 1, no. 4 (2018): 99–107. http://dx.doi.org/10.24815/jarsp.v1i4.12460.
Full textAbstract:
Clay soil from Desa Meunasah Rayeuk quarry in Kaway XVI, West Aceh Regency is a land material frequently used for construction of road infrastructure. In this quarry, there are three types of soil based on the color, yellow, red, and gray. The three types of soil have expansive characteristics, so they are not suitable for subgrade. This unoptimal characteristic can be improved through soil stabilization. One of them by utilizing the reaction of catinonization between lime Ca(OH)2 with the clay soil. Therefore, a research needs to be conducted to find out the characteristics of physical and mechanical properties of the original soil and the effect of cationization of the soil and lime mixture on the soil plasticity index and soil shear strength parameters. Testing is done through mineralogical test and ASTM standard tests that include physical properties, standard compaction, and direct shear strength test. Variations of lime addition are 0%, 3%, 6%, 9%, and 12% of the soil dry weight. The test results show that the addition of lime can reduce the soil plasticity index and increase the shear strength of the soil on some level. At mixing up to 12% lime, the soil plasticity index dropped to 12.93% in yellow clay, 11.12% in red clay, and 16,76% in gray clay. The plasticity index after the addition of 12% lime has not met the minimum plasticity index requirement, ie 11%. The maximum shear strength for yellow clay is obtained at 3% lime, and 6% lime for red and gray clays.
35
Tchakalova, Boriana, and Plamen Ivanov. "Correlation between effective cohesion and plasticity index of clay." Geologica Balcanica 51, no. 3 (2022): 45–49. http://dx.doi.org/10.52321/geolbalc.51.3.45.
Full textAbstract:
Correlations of engineering properties are a useful tool in geotechnical engineering practice. This paper aims to provide a correlation between the effective cohesion and plasticity index for natural, undisturbed clay soils from the Kozloduy area (NW Bulgaria), based on the results from laboratory tests. It has been demonstrated that there is a strong correlation between the plasticity index and the effective cohesion. The derived regression equation can be used to estimate the effective cohesion as first approximation in preliminary design of engineering projects of Pliocene and Quaternary clays encountered in northwest Bulgaria.
36
Natalis Pasereng, Windhu Nugroho, and Agus Winarno. "Studi Implementasi Nilai Shale Rating Batulanau dalam Penentuan Alat Gali di PT Bintang Prima Energi Pratama Kabupaten Kutai Kartanegara Provinsi Kalimantan Timur." Venus: Jurnal Publikasi Rumpun Ilmu Teknik 2, no. 4 (2024): 164–84. http://dx.doi.org/10.61132/venus.v2i4.408.
Full textAbstract:
The activity of dismantling shale sometimes does not align with the rating of the shale itself. Although shale generally has low durability, some types of shale exhibit considerable strength. Therefore, if the tools used are not suitable, the excavation process becomes inefficient. One shale classification method proposed by Franklin (1982) is by determining the value of slake durability index, plasticity index, and point load index. If the slake durability value exceeds 80 percent, testing continues with point load testing. However, if the slake durability value is below 80 percent, then liquid limit and plastic limit tests are conducted to obtain its plasticity index. This study is applied to the Kampungbaru Formation at PT Bintang Prima Energi Pratama. The shale testing results of the Kampung Baru Formation at PT Bintang Prima Energi yielded slake durability index values below 80 percent, thus the shale ratings based on slake durability index and plasticity index values, for KB1BL1 are 4.2; KB1BL2: 3.5; KB1BL3: 2.55; KB1BL4: 3.35; KB1BL5: 3.15; and KB1BL6: 3.65. With an average shale rating value of 3.57. The excavation tool used for these rocks is a backhoe.
37
Al-Zubaidy, Dunia S., Khalid R. Aljanabi, and Zeyad S. M. Khaled. "Forecasting the Compressibility Parameters of Gypseous Soil using Artificial Neural Networks." IOP Conference Series: Earth and Environmental Science 961, no. 1 (2022): 012019. http://dx.doi.org/10.1088/1755-1315/961/1/012019.
Full textAbstract:
Abstract To ensure safe design of structures against settlement, it is necessary to determine the compressibility parameters of the underneath soil especially compression and rebound indices. In this paper, an approach to forecast the compressibility parameters of gypseous soils based on index parameters was developed using Artificial Neural Networks technique. Two equations were developed to estimate compression and rebound indices using back propagation algorithm to train multi-layer perceptron, in which good agreements were achieved. The input parameters used were: the depth, gypsum content, liquid limit, plastic limit, plasticity index, passing sieve No.200, dry unit weight, water content and initial void ratio. Two output parameters were determined including compression index and rebound index. A parametric study was also conducted to investigate the generalization and robustness of both models. The findings indicate that both models were reliable within the range of utilized data. It was found that gypsum content has the highest effect on the compressibility index followed by water content, plasticity index, dry unit weight and plastic limit, while other parameters have lower effect. The gypsum content has the highest effect again on the rebound index followed by passing sieve No.200, initial void ratio, plastic limit and plasticity index, while other parameters have lower effect.
38
Scholz, Alexander, Anke Stein, Brendan Choat, and Steven Jansen. "How drought and deciduousness shape xylem plasticity in three Costa Rican woody plant species." IAWA Journal 35, no. 4 (2014): 337–55. http://dx.doi.org/10.1163/22941932-00000070.
Full textAbstract:
This paper explores the phenotypic plasticity of xylem in tropical trees in order to test the hypothesis that different leaf phenological patterns influence levels of xylem plasticity. Wood anatomy was studied in the wet-deciduous species Cordia alliodora (Ruiz & Pav.) Oken, the dry-deciduous species Tabebuia rosea (Bertol.) DC., and the evergreen species Ocotea veraguensis (Meisn.) Mez., collected from seasonally dry forest and tropical cloud forest in Costa Rica. Xylem plasticity and trait conservatism were examined by analysing the coefficient of variation (CV) and the relative distance plasticity index (RDPI) of xylem anatomical traits. The two deciduous species exhibited wider vessels, lower wood density, and higher Huber values than the evergreen species. Furthermore, intervessel connectivity was highest for the two deciduous species in seasonally dry forest compared to cloud forest, whereas the opposite was found for the evergreen species. Overall highest trait variability was found for all plants at the seasonally dry site. The evergreen species O. veraguensis had the highest plasticity values compared to the deciduous species. Highest plasticity was found for vessel composition index (vessel area/vessel number), whilestrongest trait conservatism was found for vessel diameter. In conclusion, our data indicate that evergreen O. veraguensis does not show less xylem plasticity than the two deciduous tree species studied.
39
Fener, Mustafa, Sair Kahraman, Yakup Bay, and Osman Gunaydin. "Correlations between P-wave velocity and Atterberg limits of cohesive soils." Canadian Geotechnical Journal 42, no. 2 (2005): 673–77. http://dx.doi.org/10.1139/t04-102.
Full textAbstract:
Undisturbed and disturbed samples of cohesive soils were collected from eight different locations to investigate the possibility of estimating the Atterberg limits of cohesive soils from P-wave velocity measurements. Each soil type was classified according to the Unified Soil Classification System, and then Atterberg limits of soils were determined and P-wave velocity measurements carried out on the undisturbed samples of each soil type. P-wave velocity values were correlated with the corresponding values of Atterberg limits. It was found that liquid limit, plastic limit, and plasticity index exhibit good correlations with P-wave velocity. The relations follow a logarithmic function. Liquid limit, plastic limit, and plasticity index decrease with an increase in P-wave velocity. In addition, liquid limit, plastic limit, and plasticity index exhibit very good correlations with the ratio of P-wave velocity to water content. Liquid limit, plastic limit, and plasticity index decrease logarithmically with an increase in the ratio of P-wave velocity to water content. It can be concluded that the Atterberg limits of cohesive soils can be predicted from P-wave velocity measurements for preliminary investigations. The developed equations have some limitations and further study is required in this area.Key words: Atterberg limits, cohesive soils, P-wave velocity, regression analysis.
40
Halling, J., R. D. Arnell, and K. A. Nuri. "The Elastic—Plastic Contact of Rough Surfaces and its Relevance in the Study of Wear." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 202, no. 4 (1988): 269–74. http://dx.doi.org/10.1243/pime_proc_1988_202_119_02.
Full textAbstract:
In a recent paper it was shown that the limit of elastic behaviour of rough surfaces could be defined by a unique relationship between the plasticity index and the nominal pressure. Specific experimental evidence suggested that the best theoretical model was one when the asperity height probability distribution was assumed Gaussian with a truncation of 3 σ. This paper extends this argument by showing that for a given ratio of plastic-elastic area of real contact, similar unique relations exist between the plasticity index and nominal pressure. It is assumed that the maximum non-dimensional elastic deformation is given by the inverse of the square of the plasticity index, and this is supported by experimental results. It is also shown that the model proposed is in error at higher pressures, due to the interaction of the deformations of adjacent asperities.
41
Pineda-León, Ernesto, Alejandro Rodríguez-Castellanos, Dante Tolentino, José Manuel Rosales-Juárez, Ivan Felix-González, and Supriyono. "Reissner Plates with Plastic Behavior: Probability of Failure." Mathematical Problems in Engineering 2018 (2018): 1–9. http://dx.doi.org/10.1155/2018/3989250.
Full textAbstract:
The current paper shows the application of the boundary element method for the analysis of plates under shear stress causing plasticity. In this case, the shear deformation of a plate is considered by means of Reissner’s theory. The probability of failure of a Reissner’s plate due to a proposed index plastic behavior IPB is calculated taking into account the uncertainty in mechanical and geometrical properties. The problem is developed in three dimensions. The classic plasticity’s theory is applied and a formulation for initial stresses that lead to the boundary integral equations due to plasticity is also used. For the plasticity calculation, the von Misses criterion is used. To solve the nonlinear equations, an incremental method is employed. The results show a relatively small failure probability (PF) for the ranges of loads between 0.6<W^<1.0. However, for values between 1.0<W^<2.5, the probability of failure increases significantly. Consequently, for W^≥2.5, the plate failure is imminent. The results are compared to those that were found in the literature and the agreement is good.
42
Nguyen, Thi Nu, and Minh Ngoc Do. "Effect of Salt Solution on Plasticity and Permeability of Vietnam's Soil Liners." International Journal of Engineering and Advanced Technology (IJEAT) 9, no. 3 (2020): 3944–48. https://doi.org/10.35940/ijeat.C6466.029320.
Full textAbstract:
In Vietnam, there are a lot of landfills to block pollutants and one of materials used for impermeable liners is soil liners (soil – bentonite mixture). In order to use as impermeable liners, the properties of soil liners such as plasticity and permeability were affected by many salt solutions which are leaching from decomposition of waste materials in the landfills. Those salt solutions can reduce the stable of impermeable liners. So, this paper presents a series of experimental studies in the laboratory to investigate the effect of some salt solutions on the properties of compaction, consolidation and plasticity of soil liners. The experimental results indicated that the salt concentration effected complex on the Atterberg limits and the vertical coefficient of permeability. It also found that increase in the salt concentration from 0N to 0.05N cause increase in plasticity index, liquid limit and decrease in the vertical coefficient of permeability. After that, the increasing of the salt concentration up to 1N resulted in decrease in the liquid limit and plasticity index and increase in the vertical coefficient of permeability increases.
43
Wiqoyah, Qunik, Sinta Thisya Wulandari, and Danang Tri Wijaya. "Penurunan Konsolidasi Tanah Lempung Kecamatan Sambi Kabupaten Boyolali yang Distabilisasi dengan Limbah Keramik." Bentang : Jurnal Teoritis dan Terapan Bidang Rekayasa Sipil 11, no. 1 (2023): 55–66. http://dx.doi.org/10.33558/bentang.v11i1.4542.
Full textAbstract:
Based on the preliminary test results, the original soil of the Sambi Boyolali area is classified as inorganic clay with high plasticity. It has a plasticity index value of 31.93%, therefore stabilization is required so that the soil is able to withstand the load of the structure above it. Stabilization was carried out by mixing the soil with ceramic waste that passed the No. 4 sieve with variations of ceramic waste 2.5%, 5%, 7.5%, and 10% of the weight of the soil sample, which aims to determine changes in physical properties and mechanical properties (consolidation settlement) before and after the soil is stabilized. The results of the physical properties test of the soil after being stabilized with ceramic waste showed a decrease in the value of water content, specific gravity, liquid limit value, and plasticity index as well as an increase in the plastic limit value, shrinkage limit value and the amount of soil that passed sieve No. 200. Soil classification changed from inorganic clay with high plasticity in the original soil, to inorganic clay with low plasticity when mixed with 10% ceramic waste. The results of the mechanical test showed an increase in the value of the maximum dry volume weight of the soil (γdmax) as well as the value of the consolidation coefficient (Cv), and a decrease in the compression index value (Cc) and the consolidation settlement value (Sc).
44
Safonova, Irina, and Nikolay Anis'kov. "INTEGRATED CHARACTERISTICS OF THE ADAPTIVE ACTIVITY LEVEL OF WINTER RYE TETRA-PLOID SAMPLES UNDER THE NORTH-WEST OF THE RUSSIAN FEDERATION CONDITIONS." Bulletin of KSAU, no. 2 (December 24, 2024): 56–64. https://doi.org/10.36718/1819-4036-2023-2-56-64.
Full textAbstract:
The purpose of the study is to evaluate tetraploid varieties of winter rye in terms of plasticity, ecologi-cal stability, adaptability, intensity in changing growing conditions and to identify varieties that are the best in terms of these indicators. The degree of realization of a consistently high yield is determined by the genotype and the influence of specific soil-climatic and temporal conditions. An integrated assess-ment of the level of adaptive potential of plasticity and stability of varieties makes it possible to select among the studied assortment the most high-yielding and ecologically adaptive forms of plants adapted to a wide range of cultivation conditions. Evaluation of ten varieties of tetraploid winter rye (Secale cereale tetraploidum nudipaleatum) was carried out in 2018–2021, according to fourteen parameters of adaptabil-ity, plasticity and stability of the trait – grain yield: by regression coefficient (bi), ecological plasticity index (O), multiplicative coefficient (ai), intensity index (I), ecological plasticity index (I.E.P.), adaptability coeffi-cient (C.A.), ecovalence (Wi), stability index (SI), stability index (Ϭd2), stability level indicator (A), geno-typic effect (Ɛi), coefficient of variation (V). Mathematical processing of experimental data was carried out by the method of two-factor analysis of variance without repetitions. It was revealed that the formation of rye yield is determined by 89.4 % by the conditions of the growing year and by 7.9 % by the variety. A high average yield level was obtained in varieties Siberia 4 (+0.86), Praleska (+0.63), Flame (+0.55) to the standard Verasen. A high level of adaptive activity was revealed by the sum of ranks – 14 parameters in the varieties Siberia 4 (Ʃ ranks = 50), Plamya (Ʃ ranks = 57), Praleska (Ʃ ranks = 61), Siberia 3 (Ʃ ranks = 70), Siberia (Ʃ ranks = 71).
45
Rambe, Renold Pangidoan, Lusmeilia Afriani, and Iswan Iswan. "Pengaruh Fraksi Lempung Terhadap Nilai Kohesi dan Indeks Plastisitas." Jurnal Rekayasa Sipil dan Desain 4, no. 2 (2016): 205–14. https://doi.org/10.23960/jrsdd.v4i2.367.
Full textAbstract:
This study aims to see the influence the fraction of clay in the sand by comparing parameters ofstrong shear soil that is resulted from unsoaked and soaked conditions of Direct Shear Test andAtterberg Limit. An increase in the fraction of clay in the sand can change the physical propertiesof the soil and the mechanical properties. An increase in the fraction of clay can also improve thevalue soil cohesion and ground plasticity index but it reduces the value soil friction. Theparameter change magnitude is analyzed by looking at the results of correlation analysis ofcohesion of the soil plasticity index, and some of the physical parameters of the soil. Thecorrelation between the shear test directly with the plasticity index against the physical propertiesof soil clays that linear regression obtained a very strong correlation (0.8 – 1) and limit land thatis used are sand which is already substituted by clays from 0% – 50%.Direct shear test which results from the condition of unsoaked conducted in the laboratoryobtained that addition levels of clay showed an increase in the value of cohesion but the angleshear declined. Direct shear test results from the condition of soaked (soaking 4 days) obtained adecrease of the value of cohesion (c) down and slide angle (φ) which is also affected by soakingthe soil. The test results show the Atterberg limits that a percentage of the original soil andaddition of clays to 20% has no plasticity index value. This is because the ground is still are off(loose soil). As for the addition of clays from the percentage of 30%, 40%, and 50% of the land isincluded soil cohesive and value each PI is 8.87%, 17.7%, and 12.04%.Keywords: direct shear, cohesion, plasticity index
46
Wang, Xing Chen, Ri Qing Xu, and Jian Feng Zhu. "Experimental Study on Shear Strength Considering Initial Void Ratio and Plasticity Index." Applied Mechanics and Materials 405-408 (September 2013): 63–67. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.63.
Full textAbstract:
A series of drained triaxial compression tests under different conditions were performed to quantitatively study the influence of the initial void ratio and plasticity index on the shear strength of remolded saturated clays. The test results show that both the peak stress friction angle and peak deviatoric stress decrease with increasing initial void ratio and plasticity index of the soil under the same confining pressure; whereas, they increase with increasing confining pressure of the soil under the same initial void ratio and plasticity index. A new synthesized physical parameter λ, which simultaneously represent both the type and the condition of remolded saturated clays, is defined based on the test results in this work. The functional relationships among the parameters φd and peak deviatoric stress in Mohr-Coulomb equation and the parameter λ are established to develop a modified Mohr-Coulomb equation by considering physical properties of soil. In this equation, only two input parameters, i.e., λ and the confine pressure, are needed to predict the shear strength of the soil. In order to check the accuracy of the proposed equation, laboratory tests were conducted to evaluate against the predicted results. The results show that the peak shear strength of remolded saturated clays can be well described by the proposed equation. Key words: shear strength; Mohr-Coulomb equation; remolded saturated clays; initial void ratio; plasticity index.
47
Pawlus, P., W. A. Grabon, and D. Czach. "Calculation of plasticity index of honed cylinder liner textures." Journal of Physics: Conference Series 1183 (March 2019): 012003. http://dx.doi.org/10.1088/1742-6596/1183/1/012003.
Full text
48
Park, K. B., and K. C. Ludema. "Evaluation of the plasticity index as a scuffing criterion." Wear 175, no. 1-2 (1994): 123–31. http://dx.doi.org/10.1016/0043-1648(94)90175-9.
Full text
49
Rosas, David Antonio, Daniel Burgos, John Willian Branch Bedoya, and Alberto Corbi. "Automatic determination of the Atterberg limits with machine learning•." DYNA 89, no. 224 (2022): 34–42. http://dx.doi.org/10.15446/dyna.v89n224.102619.
Full textAbstract:
In this study, we determine the liquid limit (𝑊𝑙), plasticity index (PI), and plastic limit (𝑊𝑝) of several natural fine-grained soil samples with the help of machine-learning and statistical methods. This enables us to locate each soil type analysed in the Casagrande plasticity chart with a single measure in pressure-membrane extractors. These machine-learning models showed adjustments in the determination of the liquid limit for design purposes when compared with standardised methods. Similar adjustments were achieved in the determination of the plasticity index, whereas the plastic limit determinations were applicable for control works. Because the best techniques were based in Multiple Linear Regression and Support Vector Machines Regression, they provide explainable plasticity models. In this sense, 𝑊𝑙=(9.94±4.2)+(2.25 ±0.3)∙𝑝F4.2, PI=(−20.47±5.6)+(1.48 ±0.3)∙𝑝F4.2+(0.21±0.1)∙𝐹 , and 𝑊𝑝=(23.32±3.5)+(0.60 ±0.2)∙𝑝F4.2−(0.13±0.04)∙𝐹 . So that, we propose an alternative, automatic, multi-sample, and static method to address current issues on Atterberg limits determination with standardised tests.
50
Akpofure, Edirin, and Leelabari John Nabie. "Mineralogy and Geotechnical Properties of Fine-Grained Sediments from Swali Community." European Journal of Environment and Earth Sciences 5, no. 4 (2024): 1–7. http://dx.doi.org/10.24018/ejgeo.2024.5.4.475.
Full textAbstract:
The mineralogical and geotechnical properties of fine grained deposits from Swali community, in Yenagoa local government area of Bayelsa State, Nigeria were analyzed using X-ray diffraction (XRD) for the qualitative analysis of the mineral composition and the Atterberg limit using ASTM D 4318 standard for the geotechnical properties. Four representative samples that were analyzed using XRD show the deposit is composed of quartz, albite, orthoclase and muscovite with average values of 59.25%, 16.45%, 13.25% and 11% respectively. No typical clay mineral was observed in the analysis. The mineral suite indicates an acid igneous rock source and long distance and time of travel. Ten samples were analyzed for the geotechnical properties, and the Atterberg limits derived are: Liquid limit ranging from 29.7% – 50.4%, Plastic limit ranging from 22.9% – 36.1% and the Plastic Index ranging from 11.4 – 26.1. Four of the samples were non plastic and only six show a measure of plasticity. The deposits are classified as inorganic lean clay in locations SW6 and SW10 designated as CL as they fall above the A – Line and have Plasticity Index > 7, and those from SW2, SW3, SW4 and SW8 are classified as silty clay with designation ML because they fall below the A – Line on the plot of Liquid limit versus Plastic Index but have Plasticity Index > 4. All the deposits have low plasticity because they fall below the Liquid limit separator line of 50% with only one on the borderline. Therefore, the deposit range from inorganic lean clay to silty clay with low plasticity derived from an acid igneous rock with long distance and time of travel.