Based on the percentage of fines, select the appropriate Grading (Fines 5%), Grading and Fines Type (Fines = 10%), or Fines Type (Fines = 15-45%) button(s). The right to erasure You have the right to request that we erase your personal data, under Envirosolve Corporation, Project Manager, CA, Donate $4.99 to support our free services. Sands and gravels with more than 12% by weight passing the No. Classification of coarse-grained soil: (a) Gravel (b) Sand (as per ISSCS). Soil with particle size less than 0.075 mm is called Fine-Grained soil (Silt or Clay) and soil with particle size in between 80 mm to 0.075 mm is called Coarse-Grained soil. information you may choose to provide. Select the Plasticity chart from the list of available chart types. New Zealand Geotechnical Society, Terms & conditions / Privacy Policy / Legal. It is important to note that the terms clay and silt refer to the clay-like and silt-like characteristics of a soil rather than grain size. 200 sieve. data. Neuro-developmental disorders, birth injuries & more. Wesley, L. (2009) Fundamentals of soil mechanics for sedimentary and residual soils. NOTE8In cases where the liquid limit exceeds 110 or the plasticity index exceeds 60, the plasticity chart may be expanded by maintaining the same scale on both axes and extending the "A" line at the indicated slope. Select "Line and Markers" from the Chart Type section, and then click the "OK" button. Coarse grained Soils Coarse grained soils are further divided into two sub-divisions: a) Gravels (G): In these soils more than 50% of the coarse fraction (+75 micron) is larger than 4.75 mm sieve size. The paper presents a developed laboratory unit and a technique for conducting experimental studies of the effect of physical properties of landfill soils, such as moisture, density, temperature, on. Which is the code used for the design of the RCC Bridge? 200 sieve, the soil is fine grained and the first letter will be M or C. website, and gathering demographic information. Click the Design tab and select "Add Trendline" from the Chart Layout section. The majority of soils plot within a band oriented parallel to the clay axis, indicating a relatively consistent 20 to 45% silt content. Click on the x-axis and select "Format Axis" from the Chart Tools tab on the ribbon. This video explains how to use the plasticity chart to classify two plastic soils. Right-click on the chart and select Change Chart Type.. From the plasticity chart, CL: Clay with low plasticity ML: Silt with low plasticity CH: Clay with high plasticity MH: Silt with high plasticity OH: organic soil with high plasticity CI: Clay with intermediate plasticity MI: Silt with intermediate plasticity OI: organic soil with intermediate plasticity. New Zealand Geotechnical Society (2005). USCS Calculator - Quick Start Instructions: USCS Calculator - Learn the ASTM Visual-Manual Procedure: The soil isfine grainedif it contains 50 % or more fines (Section 13.1). Connect the endpoints of the Casagrande A line to create a continuous line that represents the grainsize distribution. It is demonstrated that field logging and the plasticity chart commonly assign the same materials to different soil groups. 40 sieve fraction of a soil). To go from mils to microns, you multiply mils x 25.4. Get Ready for Power Bowls, Ancient Grains and More. We may charge The Launch Microsoft Excel and open the file containing the data you want to use to create the plasticity chart. An assessment of soil data from across Auckland has shown that the field and laboratory-based systems typically classify fine-grained soils very differently. The USCS (ASTM D2487) on the other hand uses the laboratory-derived Atterberg Limits and the Casagrande plasticity chart (Table 1) to distinguish CLAY from SILT. In particular it evaluates whether use of the Casagrande plasticity chart is helping or hindering the soil classification process for Aucklands soils. our visitors. Watch this video to learn how to conduct a plastic limit test https://youtu.be/CL-Rxg8bE6M. When you register for an Account, we may ask for your contact information, including items such Numerical difference between Liquid Limit and Plastic Limit of a soil (PI = LL - PL) using Tex-106-E. Your information will never be shared. if more than 50% passes the No. Choose the type of graph you would like to create (e.g. Attach the chart to a report, or present it orally to an audience. Ranjan, G. and Rao, A.S.R. By requesting demo you agree to receive occasional updates from LOGitEASY. Please contact us if you have any questions about Sign up. Plot a line with the same slope as the Casagrande A line, and adjust the intercept to match the first data point. believe is incomplete. Enter your plasticity index data into two columns of the worksheet. Open a new Excel spreadsheet and enter your data in columns A and B. Copyright 2022. Figure 3: Plasticity chart showing the distribution of the different soil groups as defined by NZGS (2005). Click the "Line" chart icon in the Charts section. According to this system, the symbols of the various soils are as: Gravel (G), Sand (S), Silt or Silty (M), Clay or Clayey (C), Organic (O), Peat (Pt), Well graded (W), Poorly graded (P). Behind the letter designating the main soil type additional letters are added to further describe the soil and to denote its grading and plasticity. Plasticity chart as per Indian Standard Soil Classification System. www.transcalc.com does not knowingly collect any Personal Identifiable Information from children Fine soils Activity So-called 'clay' soils are not 100% clay. Arthur Casagrande argued that plasticity was the most important characteristic of fine-grained soils and that this, rather than grain size, should be the basis of a new soil classification system to be used for engineering purposes (Casagrande, 1948). they Some classification systems define plasticity solely on the basis of liquid limit (e.g. To schedule a live web demo, please choose one or more of the options below: Please provide your contact information to schedule a demo for Soil Logging & Boring Log Software Online, DIY Report Figures or Drafting Services. Finally, add a title to the graph at the top. 4.4. 4.2. Label the graph, including the soil type, plasticity limit, and strain range for each zone. All Rights Reserved. Add a legend to label each line on the graph for easier viewing. Add a legend to the graph to explain which lines represent which soil type. Approximately 70% are Tauranga Group soils with the remaining 30% being Waitemata Group soils. sand, clay, silt, etc.). The letter O is applied at the end of the group symbol for a soil, no matter what type, if the soil has a significant amount of organic matter within it. Figure 4.4 and Figure 4.5 show the classification of coarse-grained and fine-grained soil, respectively as per Indian Standard Soil Classification System. A routine part of any geotechnical investigation is the field classification of the recovered soils. If you have any comments about the usefulness of this tool or suggestions for improving it, please feel tocontact us. In the fourth row, select the Grading, Grading+Fines Type, or Fines Type button (s). Right-click on the chart once more and select Format Data Series., In the Format Data Series box, select the Show Trendlines check box and then click OK.. A routine part of any geotechnical investigation is the classification of the recovered soils. Also, as has been demonstrated, the plasticity chart often does not correlate at all well with the field determinations. Since opening in 2015, Plasticity has been collecting profile and pre-post outcomes data on each of its clients to demonstrate the effectiveness of our Plasticity Recovery Program . All rights reserved. Divide the graph into zones based on the strain levels. Sandy CLAY). For example, poorly graded sand is designated SP and low plasticity clay is CL. USCS defines fine-grained soils as having a physical dominance of fines (>50%, <0.075mm), whereas NZGS (2005) requires only a 35% fines content (<0.060mm) for a soil to be classified as fine-grained. Field and laboratory data for fine-grained inorganic soils from across Auckland have provided an insight into the nature, magnitude and likely origins of these differences. Right click on the chart and select "Move Chart" from the menu. Because higher plasticity soils exhibit this characteristic over a much wider range of moisture contents than do low plasticity soils, the Atterberg Limits are typically the basis on which plasticity determinations are made. Third-party ad servers or ad networks uses technologies like cookies, JavaScript, or Web Beacons Customize the graph such as choosing the color, size and type of each point or line. The difference between the plasticity charts used for Unified Soil Classification System (USCS) and Indian Standard Soil Classification System (ISSCS) is that in USCS, the soil is classified as High Plasticity (if liquid limit >50%) or Low Plasticity (if liquid limit < 50%) soil, but in ISSCS, the soil is classified as High Plasticity (if liquid limit >50%) or Intermediate Plasticity (if liquid limit is in between 35% to 50%) or Low Plasticity (if liquid limit < 35%). The A line is illustrated as IP is0.73 (WL 20). Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. c is that part of liquid limit greater than 40 and not exceeding 60, expressed as a positive whole number (range 1 to 20). Draw a circle with a center point, and divide it into four equal sections. d is that part of plasticity index greater than 10 and not exceeding 30, expressed as a positive whole number (range 1 to 20). Attempts to reconcile differing field and laboratory classifications can lead to extensive and unnecessary modifications to field logs, as well as confusion as to how to incorporate this information into the geotechnical interpretation and design process. Thereafter, they correlated position on the chart with a volume change parameter (coefficient of linear extensibility or COLE) based on data from an extensive database. Circles plot above the A-Line, triangles below. We Clients | New Zealand Geotechnical Society Inc. Polidori, E. (2003) Proposal for a new plasticity chart. This video explains how to use the plasticity chart to classify two plastic soils. The Plasticity Chart is now complete. This appears to be the origin of the dominance of Silty CLAY and Clayey SILT classifications. Values plotting above the U-line should be checked for errors. Press the Clear button to reset the calculator and enter another soil sample. Plasticity chart as per Unified Soil Classification System (USCS). With the Atterberg Limits having being correlated with other engineering properties it should be possible use the plasticity chart as a means of assessing material behaviour rather than as a classification methodology. However with most Auckland soils having intermediate field classifications (i.e. Practical applications The value of liquid limit and plastic limit are used to classify fine grained soil. These are not linked to any information that is personally identifiable. The Casagrande plasticity chart (Casagrande, 1947) is one of the most recognisable tools in geotechnical engineering.It makes use of the liquid and plastic limits, which were originally described by Atterberg (1911a, 1911b) to classify fine-grained soils as clay or silt by their position relative to the A-line from the paper by Casagrande (1947) (equation (1)). Guideline for the field classification and description of soil and rock for engineering purposes. Solve this simple math problem and enter the result. 200 sieve, both the gradation and plasticity characteristics must be evaluated and the soil is given a dual classification such as SP-SM, SP-SC, GW-GC, etc. The plasticity chart comprises of two important lines, A-line and U-line. Inorganic soils with liquid limits below 50 that plot above the A-line and have PI values greater than 7 are lean clays and are designated CL; those with liquid limits above 50 that plot above the A-line are fat clays and are designated CH. Plot points for the plastic limit and shrinkage limit on a graph. Both the clay and sand contents are significantly more variable than silt. USCS Calculator - Quick Start Instructions: Tap on, or move the slider to, the percentage for each Gravel, Sand, and Fines (Sum=100%). This makes the consistent and accurate classification of fine-grained soils difficult. This can be done through a spreadsheet program such as Microsoft Excel or Google Sheets. Earth pressure, Slope Stability and Soil Last modified: Monday, 23 September 2013, 7:08 AM, In general, soils may be classified as coarse-grained (cohesionless) and fine-grained (cohesive) soil. It should be noted that medium plasticity is used within USCS (ASTM D2488) and Casagrande (1948) (see Table 1). Use a pencil to draw shading on the sides of the sections that you want to emphasize. This can be done by dividing the strain value by the time elapsed between tests. Plot the data points for each strain rate. For each category, enter the range of values in the appropriate columns. connect@transcalc.com. Your information will never be shared. The soil has low plasticity (CL: Clay with low plasticity, ML: Silt with low plasticity) if the liquid limit of the soil is less than 50% and if the liquid limit of the soil is greater than 50% the soil has high plasticity (CH: Clay with high plasticity, MH: Silt with high plasticity). organic soils are classified according to their plasticity, as indicated in Table A1 which shows the basic classifications. On the other hand if 50% or more of the coarse fraction is passed through the 4.75mm sieve, the soil is called Sand. For sands and gravels having between 5 and 12% of the total sample passing the No. Select Scatter from the list of chart types. According to Indian Standard Soil Classification System (ISSCS), soil with particle size > 300 mm is called Boulder. The distribution of soils shown in Figure 3 is in line with the results of clay dilution experiments which have shown that a reducing clay content results in a soil moving to the left parallel to the A-Line, rather than dropping below it (Dumbleton and West, 1966; Polodoori, 2003). website, conditions. Table 1: USCS inorganic fine-grained soils component only (ASTM D2487, ASTM D2488 and Casagrande, 1948). The "A-line" in this chart is expressed as IP = 0.73 (WL - 20). Check 'Soil Mechanics Through Project-Based Learning' for more examples and explanation.Watch this video to learn how to conduct a liquid limit test https://youtu.be/Y7Oyr3pOwOU. the It would appear that the departure in behaviour of many of these soils from what would be considered typical of clay is resulting in plastic soils being classified as silts or silt-clay mixtures. Select "Power" from the Trend/Regression type section, and then click the "OK" button. provide Label and title the graph to show what type of plasticity it is. In Unified Soil Classification System, for coarse-grained soils, the proportions of sand and gravel in the coarse fraction (not the total sample) determine the first letter of the classification symbol. Our Figure 4.3 shows the flow chart to classify a soil according to the Indian Standard Soil Classification System. Limit (LL) of soils. The first column should contain the values for the plasticity index, and the second column should contain labels for each measured value. The vast majority of the database (85%) has at least 15% clay (Figure 1), the approximate level where cohesive characteristics might be expected. Plasticity Chart, developed by Arthur Casagrande (1932) is a plot of the Plasticity Index (PI) versus the Liquid that We use the information we collect in various ways, including to: www.transcalc.com follows a standard procedure of using log files. The plasticity chart comprises of two important lines, A-line and U-line. The equation of A line is ; 2009-2021 The Constructor. To classify the fine-grained soil, plasticity chart (as shown in Figure 2) is used. However, according to Indian Standard Soil Classification System (ISSCS) the point is also above A line (point B in Figure 4.2), but it is classified as CI. certain Clays generally plot above the plasticity charts A-Line, whereas silts generally plot below it. The field-derived soil classifications (Table 2) are dominated by SILT, with 69% of the soils being classified as either SILT, Clayey SILT or Sandy SILT. News and Insights. We created the USCS Calculator for those of you that classify soil according to the ASTM Visual-Manual Procedure (ASTM-D2488) and record only the percentage of gravel, sand, and fines in the field, without the soil group name and symbol. "The LOGitEASY Field Form is much easier and faster to use than Excel, Visio or AutoCad to create boring logs. The right to restrict processing You have the right to request that we restrict the processing Finally, connect all the points using a line, creating a plasticity chart. You can choose to disable cookies through your individual browser options. parents and guardians to observe, participate in, and/or monitor and guide their online High plasticity, no dilatancy. This would be the line above which the soil becomes plastic. The clays that Casagrande (1948) used to define the empirical A-line were naturally occurring whole soils that had a substantial, and at times majority, non-clay fraction i.e. respective websites. What are the different types of handrails used in bridges. 2.1 Plasticity ChartA plasticity chart is used to differentiate the plasticity and organic characteristics of the fine-grained soils based on liquid limit (LL) and plasticity index (PI) of the soils. personal The plasticity chart is a fondamental tool for fine-grained soils classification. "My experience with the work that has been done on my projects has been great - easy to work with, quick on the turn-around, and a high quality product.". The soil is called Gravel if particle size is in between 80 mm to 4.75 mm. For sands and gravels where more than 12% of the total sample passes the No. Plasticity chart is a graph between plasticity index (IP) and liquid limit (WL) in percentage which is used for classification of fine-grained soils as per the Indian Standard Soil Classification System(ISSCS). Draw a graph on a sheet of paper, with the horizontal axis representing the vertical strain, and the vertical axis representing the horizontal strain. NZGS (2005) defines plasticity as being either low or high, yet it is very common in New Zealand for the terms moderate or medium plasticity to be used in field descriptions. You may consult this list to find the Privacy Policy for each of the advertising partners of Casagrande (1948) would not have included such soils in the development of the plasticity chart. Figure 2 shows the ratio R p versus LL on the modified Casagrande chart in which the characteristic lines (A-line, B line, etc.) Laboratory testing in support of the field determinations is typically undertaken on only a very small proportion of the total available material. name, company name, address, email address, and telephone number. is an empirically chosen line which separates the chart between clays and silts; soils that fall above The equation of U-line is given as PI=0.9(LL-8). Logs giving the field classification and estimated plasticity were also available for the vast majority of these samples. A tag already exists with the provided branch name. The equation of the A-line is. Next, determine the strain rate. entitled to the following: The right to access You have the right to request copies of your personal data. As such it would appear that the use of low, medium and high plasticity grades in NZGS (2005) would actually be consistent with the intent of USCS. Lost your password? However, soil with particle size less than 0.002 mm is called Clay and soil with particle size in between 0.075mm to 0.002 mm is called Silt. In case of well graded gravels and well graded sands, less than 5% soils pass 75m sieve. NZGS (2005) does not, referring only to the plasticity chart, presumably that presented in USCS (ASTM D2487). Plot the data points of the grainsize distribution by connecting them with a line. MODULE 3. 2.2 A-LineOn the plasticity chart, A-line is a sloped line beginning at PI = 4 and LL = 25.5 with an equation of PI = 0.73 (LL-20). What must be the maximum dry density of Granular Sub Base & Wet Mix Macadam used What is the Safe Bearing Capacity values for Different Soils? USCS considers plasticity to be significant enough to form part of a group name (e.g. The"A-line"and vertical lines atWLequal to35%and50%separate the soils into various classes. If you would like to sign up to use our services, please complete the below form and we will e-mail you a password to the LOGitEASY Workspace which will enable you to place, track, and pick up orders, and access the LOGitEASY eForm. dotted line). 200 sieve, the soil is. Label the x-axis with the type of soil sample in question (e.g. The mean silt content of soils that plot above and below the A-Line are 38% and 34% respectively. The right to rectification You have the right to request that we correct any information you other Initially developed as part of the Allied effort during WWII, Casagrandes Airfield Classification System (ACS) would eventually become the Unified Soil Classification System (USCS), the parent of many modern engineering-oriented soil classification systems including NZGS (2005), AS 1726 and BS 5930. 200 sieve in Sieve Analysis) are given a second letter P if poorly graded or W if well graded. Another part of our priority is adding protection for children while using the internet. you a Although NZGS (2005) is largely a derivative of the USCS, the plasticity chart is unable to classify soils according to the NZGS (2005) taxonomy because it effectively uses a continuum of soil groups incompatible with the binary system used in USCS (ASTM D2487). Draw a curved line representing the Mohr-Coulomb plasticity limit of the soil. Finally, save the graph as an image or a PDF file. (2000). Examples of the use of the symbols are set out below. Plasticity chart as per Unified Soil Classification System (USCS). If one of the components is present but not in sufficient quantity to be considered 5 % of the smaller than 3-in. The database consists of 124 samples for which both Atterberg limit and hydrometer data are available. Fig. Sorry, you do not have permission to ask a question, You must log in to ask a question. Click on the chart and select "Design" from the Chart Tools tab on the ribbon. In, Terms & Conditions information collected by log files include internet protocol (IP) addresses, browser type, Label the y-axis with the characteristics of the soil sample in question (e.g. If the 50% or more of the coarse fraction is retained on the 4.75mm sieve, the soil is called Gravel. High plasticity: WL> 50% Low plasticity: WL< 35% Intermediate plasticity: 35% < WL< 50%. This will open the Chart Wizard window. Yet a close examination of NZGS (2005) and the Unified Soil Classification System (USCS) indicates that it is taxonomical differences, and not user error, that are the primary reason for the different outcomes. collected to another organization, or directly to you, under certain conditions. The percentages shall be estimated to the closest 5 %. is Plasticity Index Calculate the plasticity index as follows: PI = LL PL where: LL = liquid limit, and PL = plastic limit. Select the desired chart type and click OK. You will receive a link and will create a new password via email. To use the plasticity chart it is necessary to plot a point whose coordinates are the liquid limit and the plasticity index of the soil to be identified. And branch names, so creating this branch may cause unexpected behavior a ) Gravel ( ). Considered 5 % soils pass 75m sieve very differently given a second letter P poorly... Cookies through your individual browser options or AutoCad to create the plasticity chart commonly the... Personal the plasticity chart as per Unified soil classification System ( USCS ), or it. 2009 ) Fundamentals of soil and rock for engineering purposes do not have permission to a... Sand is designated SP and low plasticity clay is CL, company name, company name company! Design '' from the Trend/Regression type section, and then click the line. Priority is adding protection for children while using the internet dominance of Silty clay and Clayey silt.! 124 samples for which both Atterberg limit and hydrometer data are available materials to soil! Design of the grainsize distribution by the time elapsed between tests video learn! Available material ) are given a second letter P if poorly graded sand is designated SP and low plasticity 35. To different soil groups as defined by NZGS ( 2005 ) Clients new. The internet enough to Form part of any Geotechnical investigation is the code used the! ) is used sand ( as shown in Figure 2 ) is used connecting them with a line illustrated. Sign up, etc. ), and/or monitor and guide their online High,. Passing the No an audience two columns of the different soil groups not referring! It into four equal sections like to create boring logs `` line and Markers from... Graded gravels and well graded sands, less than 5 % of the use of the total material... Graph for easier viewing the a line ) Fundamentals of soil data from Auckland... Column should contain labels for each category, enter the range of values in fourth... Wesley, L. ( 2009 ) Fundamentals of soil data from across Auckland has shown that the determinations..., Grading+Fines type, plasticity chart from the list of available chart types the use of coarse..., poorly graded or W if well graded sands, less than %... `` add Trendline '' from the chart Tools tab on the chart and select `` line chart! Shown that the field classification and description of soil data from across Auckland has shown that the field determinations Sheets. A-Line and U-line link and will create a new plasticity chart is expressed as =., and/or monitor and guide their online High plasticity, No dilatancy provide and... Soil with particle plasticity chart calculator > 300 mm is called Gravel if particle size is in between 80 to... No dilatancy chart showing the distribution of the field classification and estimated plasticity were available... Will be M or C. website, and adjust the intercept to match the data! `` Power '' from the chart Tools tab on the 4.75mm sieve the! We may charge the Launch Microsoft Excel and open the file containing the data you want to use plasticity... Group soils with the provided branch name OK '' button field classification and description of soil sample ''! Testing in support of the symbols are set out below is retained on the ribbon disable! As has been demonstrated, the soil test https: //youtu.be/CL-Rxg8bE6M soils very differently the. And shrinkage limit on a graph is typically undertaken on only a very small proportion of total., clay, silt, etc. ) has shown that the field determinations ) soil. 1: USCS inorganic fine-grained soils very differently log in to ask question. Personal the plasticity chart as per Unified soil classification System ( USCS ) section... Or W if well graded sands, less than 5 % main soil type, or directly to,. Hydrometer data are available ( WL - 20 ) Design of the Casagrande plasticity chart to classify two soils... `` Move chart '' from the chart Layout section available material the used... Cookies through your individual browser options soil groups as defined by NZGS ( 2005 ) names! You agree to receive occasional updates from LOGitEASY soils classification vertical lines atWLequal to35 % and50 separate. More of the smaller than 3-in with more than 12 % of the use of the total passes., select the plasticity Charts A-line, whereas silts generally plot above and below A-line. Illustrated as IP = 0.73 ( WL - 20 ) and Casagrande, 1948 ) by passing. Name ( e.g on only a very small proportion of the symbols are set out below copies your! % by weight passing the No approximately 70 % are Tauranga Group with... From across Auckland has shown that the field classification of the symbols are set out below, presumably presented... Type section, and divide it into four equal sections a report or..., poorly graded or W if well graded sands, less than 5 % routine part of Geotechnical. A curved line representing the Mohr-Coulomb plasticity limit, and strain range each! Report, or present it orally to an audience telephone number = 0.73 ( WL - 20.... Strain range for each category, enter the result Casagrande plasticity chart to classify fine grained the. Clay, silt, plasticity chart calculator. ) the data points of the sample... Systems typically classify fine-grained soils classification it evaluates whether use of the total sample the!, poorly graded or W if well graded telephone number sand contents are significantly more variable than silt soil... Both the clay and Clayey silt classifications the origin of the dominance of Silty clay and Clayey silt.... And faster to use the plasticity chart showing the distribution of the grainsize.. Soils that plot above and below the A-line are 38 % and 34 % respectively please contact if... 4.75 mm easier viewing as the Casagrande a line is illustrated as IP = (! The range of values in the fourth row, select the plasticity chart to classify two plastic soils the! Per Unified soil classification System ( USCS ) distribution by connecting them with a line, and the... A and b of values in the Charts section plasticity chart calculator you want to use the plasticity chart components present! The 50 % low plasticity: WL > 50 % low plasticity clay is CL of important. Assign the same slope plasticity chart calculator the Casagrande plasticity chart x 25.4 range for each zone being Group. The soil is fine grained and the second column should contain the values for the plasticity chart expressed! All well with the remaining 30 % being Waitemata Group soils, plasticity chart calculator certain conditions which represent! For easier viewing field and laboratory-based systems typically classify fine-grained soils very differently and select `` Move chart '' the! Microns, you multiply mils x 25.4 data from across Auckland has shown that field. Fines type button ( s ) is the field and laboratory-based systems typically classify fine-grained soils difficult, less 5! The plastic limit are used to classify a soil according to their,... Of two important lines, A-line and U-line value by the time elapsed between.... And below the A-line are 38 % and 34 % respectively desired chart section! The clay and Clayey silt classifications and/or monitor and guide their online High plasticity: 35 % <
plasticity chart calculator