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LEpave© Design Program    
This LEpave Design Program is intended to assist contractors and engineers in saving time & money by providing geogrid recommendations to solve soft subgrade problems and enhance road performance. The design methodologies incorporated follow current state-of-practice and our experience to give the user peace of mind. Please read the information below and in the accompanying User's Guide before using the tool.    
I have Read, Understand and Accept the LEpave Terms and Conditions of Use (Below):
   
           
           
                                         
"*** Terms and Conditions of Use ***

LEpave is a tool for use by engineers and other professionals to assist them in determining the proper L.E. Geosolutions, LLC geogrid products to use in their design of earth structures which incorporate geogrids. LEpave is only a tool and is not a substitute for professional judgment. L.E. Geosolutions, LLC is not engaged in engineering or rendering any other forms of professional design service. Competent professional design services should always be sought. Anyone making use of LEpave does so at their own risk. The professional using the LEpave Design Program is responsible for determining if the principles, formulas, safety factors and assumptions are appropriate for the particular site conditions and project requirements for which geogrids will be used. The entire risk as to quality or usability of the information contained in or produced by the LEpave Design Program is with the user. Each person using LEpave, by clicking the "I have read, Understand and Accept the LEpave Terms and Conditions of Use" button, (a) acknowledges that the LEpave Design Program is based on general principles, formulas, safety factors and assumptions that are not specific to any particular site or project and that the user has access to such general principles, formulas, safety factors and assumptions for purposes of determining acceptability for their specific site and project and (b) agrees (1) to assume all risks related to the use of the LEpave Design Program in connection with the specific site and project involved, (2) the program is only an aid and no warranties of any kind are made or implied concerning the suitability of the tool for any particular site or project or the accuracy of output with respect to any specific application and (3) to indemnify and hold harmless L.E. Geosolutions, LLC and Affiliates from any and all claims, loss, damage and expense, including without limitation attorneys’ fees, resulting from bodily injury, death, property damage or otherwise arising out of or connected with any use of the LEpave Design Program. L.E. Geosolutions, LLC and Affiliates retain title to and ownership of all aspects of and interests in the LEpave Design Program, including, without limitation, patents, copyrights, trademarks, trade secrets and other intellectual property rights.

*The term “L.E. Geosolutions and Affiliates” as used in these terms and conditions of use means L.E. Geosolutions, LLC and each of their material suppliers, software consultants, directors, officers, employees, agents and distributors. "
    
Available Design/Evaluation Tools                              
QUICK UNPAVED ROAD DESIGN   FULL UNPAVED ROAD DESIGN   PAVED ROAD DESIGN    
This module is designed for use in soft subgrade applications where a detailed design is not warranted or the data required for such a design is unavailable.The input data required is minimal and easily gathered by non-engineers. Appropriate aggregate thickness and geogrid types are suggested based on experience and a successful history of use. This module is applicable for subgrade improvement under pavements, access roads, temporary roads and other unsurfaced roads and working platforms.   This module provides analyses based on the Giroud-Han design method for unpaved roads. This method was first published in the August 2004 volume of the ASCE Geotechnical and Geoenvironmental Journal. It is intended to be used when more engineering data is available and/or a more rigorous analytical approach is required. The output provides a comparison of various geogrid-reinforced and unreinforced options.   This module facilitates analyses of geogrid-reinforced flexible pavements in accordance with the method prescribed in the AASHTO ’93 Flexible Pavement Design Guide and AASHTO Standard Practice R 50-09. It suggests optimum combinations of geogrid and base course to either reduce initial construction costs or increase pavement design life. The tool applies conservative, geogrid-specific layer coefficient ratios (LCRs) or Traffic Benefit Ratios (TBRs) developed based on more than 30 years of successful biaxial geogrid research and field performance data.    
Additional Notes:                                    
Printing Results:   To request a Quote or Assistance:   TO Reset ALL Values:    
To print the input data and results for a particular module, click the "Print Page" button. A dialog box will display the printers currently available for use on the system currently being used.   Click the "Print Page" Button and instead of printing, save as a PDF to your desktop. Send your new PDF to L.E. Geosolutions in an email: jim.penman@LEgeosolutions.com. Be certain to include your contact details. You will be contacted within 24-hours to discuss your project needs. Alternatively, you may call our office at: +1 404 368 0052   NOTE that the "Reset" Button resets ALL input values to blank/default values.    
Copyright©2018 L.E. Geosolutions, LLC All rights reserved V1.0 - 03-17           www.LEgeosolutions.com    
                                         
    LEpave© Design Program  
Project Information & User Preferences  
Please provide the basic project information below if printed output and/or technical assistance is desired. Otherwise, you may skip to the TAB applicable to your project.
  
Preferred Unit System              
             
General Information              
Project Name:    
Location:    
Description:    
Contact Information              
Name:    
Company:    
Address:    
City:          
State/Province:   Postal Code:  
Phone:            
email:            
Copyright©2018 L.E. Geosolutions, LLC All rights reserved V1.0 - 03-17   www.LEgeosolutions.com  
      LEpave© Design Program  
QUICK UNPAVED ROAD DESIGN  
This module provides the user with conservative, quick, experienced based, geogrid product selection suggestions where soft or difficult soils are encountered and limited information is available. It is intended for applications such as access/temporary road construction, subgrade improvement layers under pavements and other unsurfaced roads and working platforms. Refer to the DETAILED UNPAVED ROAD DESIGN module if a more in-depth approach is required.  
   
General Notes & References:              
1) Default values are experience-based and should be reviewed and adjusted by the user where necessary to reflect local site conditions.    
2) The analysis and results for the QUICK UNPAVED DESIGN module are based on experience and the Giroud-Han design method for unpaved roads. This method was published in the August 2004 volume of the ASCE Geotechnical and Geoenvironmental Journal.    
     
Input Parameters:            
Application/Performance Information:              
Select Application:
Working Platform (access for construction)
Temporary Road/Parking/Laydown Area
Stone Surfaced Road/Parking/Laydown Area
Other
   
Allowable Rut Depth:
         
Heaviest Vehicle/Equipment:
     
Loading Information:              
  Default User Input          
Number of Axles: /vehicle Note: Default values are estimated based on selected Application/Performance Information. Input desired values in blank cells to override.  
Frequency of Vehicle Passes: /day  
Required life:
 
Axle Load:        
Tire Pressure (p):        
Site/Stone Information:              
Subgrade Soil Support:
   
Subgrade Moisture Condition:
     
Base Stone Description:
       
  Default User Input          
Subgrade CBR:          
Results:              
     
  Recommended Solution      
Base Stone Thickness (hr):      
Recommended Geogrid:    
           
Note: It may be advisable to add a geotextile between the geogrid and subgrade under some conditions. Consult your L.E. Geosolutions Sales Representative for further guidance.    
Copyright©2018 L.E. Geosolutions, LLC All rights reserved V1.0 - 03-17   www.LEgeosolutions.com  
    LEpave© Design Program  
FULL UNPAVED ROAD DESIGN  
This module provides the user with geogrid product and section thickness recommendations for access/temporary road construction, subgrade improvement layers under pavements and other unsurfaced roads and working platforms. The computations performed are based on the references listed below. If design information is limited or unknown, refer to the QUICK UNPAVED ROAD DESIGN module for experienced-based guidance.  
   
General Notes & References:              
1) It is strongly recommended that the designer familiarize themselves with the references listed below BEFORE using the FULL UNPAVED ROAD DESIGN module.      
2) References include:              
Giroud, J.P. and Han, J. (2004a). “Design method for geogrid-reinforced unpaved roads — Part I: theoretical development”, ASCE Journal of Geotechnical and Geoenvironmental Engineering, 130(8), 776-786.      
Giroud, J.P. and Han, J. (2004b). “Design method for geogrid-reinforced unpaved roads — Part II: calibration and verification”, ASCE Journal of Geotechnical and Geoenvironmental Engineering, 130(8), 787-797.      
FHWA. (2008) FHWA NHI-07-092. “Geosynthetic Design & Construction Guidelines Reference Manual”, U.S. Department of Transportation, Federal Highway Administration, Washington, D.C.      
Input Parameters:                
Desired Service Life:
       
Allowable Rut Depth (Sr):
           
Design Loading:                
Vehicle Description:        
Frequency of Vehicle Passes:
     
Number of Axles: /vehicle        
Design Axle Load:          
Tire Pressure (p):          
Site/Material Characteristics:              
Subgrade Soil Description:      
Subgrade Soil Strength in terms of:
       
Base Material Description:      
  Default User Input NOTE: The default Base Material CBR is a function of the subgrade strength as it is limited to a value that produces a Modulus Ratio (RE) of 5.0; this is based on the Giroud and Han's (2004b) limitation. The analysis will be based on the lower of the user input value or the default. Entering a higher value than the default will not change the results.    
Base Material CBR:      
Results:                
   
  Base Material Thickness Required Base Material Savings      
Unreinforced (h): (%)      
L.E. Geosolutions BX Type 1 (hBX1):      
L.E. Geosolutions BX Type 2 (hBX2):      
Note: It may be advisable to add a geotextile between the geogrid and subgrade under some conditions. Consult your L.E. Geosolutions Sales Representative for further guidance.    
Copyright©2018 L.E. Geosolutions, Inc. All rights reserved V1.0 - 03-17   www.LEgeosolutions.com  
    LEpave© Design Program  
PAVED ROAD DESIGN  
This module facilitates analyses of geogrid-reinforced flexible pavements in accordance with the method described in the AASHTO ’93 flexible pavement design guide and AASHTO Standard Practice R 50-09. It suggests optimum combinations of geogrid and base course to either reduce initial construction costs or increase pavement life span. The tool applies conservative, geogrid-specific layer coefficient ratios (LCRs) or Traffic Benefit Ratios (TBRs) developed based on more than 30 years of successful biaxial geogrid research and field performance data.  
 
General Notes & References:            
1) Default design parameters for the PAVED ROAD DESIGN module are based on general experience and the typical values prescribed in the reference material listed below. The user may override any of the default values by entering a different value in the corresponding edit box. To use the default values provided, leave the corresponding edit box blank.
 
2) It is strongly recommended that the user familiarize themselves with the references listed below prior to using the PAVED ROAD DESIGN module:  
3) References include:          
American Association of State Highway and Transportation Officials (AASHTO), 1993, "AASHTO Guide for Design of Pavement Structures," Washington, D.C.  
American Association of State Highway and Transportation Officials (AASHTO), 2010, "Standard of Practice for Geosynthetic Reinforcement of the Aggregate Base Course of Flexible Pavement Structures," AASHTO Designation: R50-09, Washington, D.C.  
Geosynthetic Materials Association (GMA), 2000, "White Paper II: Geosynthetic Reinforcement of the Aggregate Base Course of Flexible Pavement Structures," IFAI Bookstore, Roseville, MN.  
Input Parameters:          
Service Requirements:            
Highway/Pavement Conditions:
   
Functional Classification:
   
             
  Default:   User Input:      
Service Life: 10   years    
Estimated initial, yearly Equivalent Single Axle Loads, ESALs (w18): 850,000   / year NOTE: w18 should consider load range conversion to 18Kip ESALs, directionality factor and lane distribution factor (See AASHTO, 1993)  
Traffic Growth factor, (g): 3.0%   /year  
Cumulative Design ESALs (W18) over entire Service Life:        
Design Reliability Level (R%):  
% NOTE: R% should consider number of planned rehabilitations, default assumes no rehabilitation, i.e. Design R% = Overall R%  
Standard Deviation (so): 0.49      
Initial Serviceability Index (po): 4.20      
Terminal Serviceability Level (pt):        
Serv. Loss from Env. Effects: 0.00       NOTE: Serviceability loss due to env. effects is assumed to be zero. Follow hand calculation example (See SPEC PLUS) if environmental effects need to be considered.  
           
Roadbed Soil/Drainage Characterization:          
Subgrade Soil Classification (per USCS):
     
Subgrade Characterized in terms of:
     
Drainage quality:
   
Pavement moisture nears saturation:
of the time.      
Strength/Modulus:    
             
Required Structural Number (SN):    
             
Unreinforced Pavement Material Characterization/Geometry:    
Asphalt Layer 1 Classification:      
Asphalt Modulus (EACw):      
thickness (D1w):    
layer coefficient (a1w):   SN1a:  
Asphalt Layer 2 Classification:      
Asphalt Modulus (EACb):      
thickness (D1b):    
layer coefficient (a1b):   SN1b:  
NOTE: If only one asphalt layer is used, simply enter 0 thickness for the other.
Granular Base Classification:
     
Granular Base Modulus (EBC):      
thickness (D2):    
layer coefficient (a2):        
drainage coefficient (m2):   SN2:  
Granular Subbase Classification:
     
Granular Subbase Modulus (ESB):      
thickness (D3):    
layer coefficient (a3):      
drainage coefficient (m3):   SN3:  
             
Calculated Structural Number (SN):    
             
Geogrid Benefit Quantified by Using:
     
       
      The default geogrid benefit values (TBR or LCR) are experience based and may or may not be representative of site specific conditions. It is recommended that the references listed above be consulted before selection of TBR or LCR values.  
L.E. Geosolutions BX1515      
L.E. Geosolutions BX2525      
L.E. Geosolutions BX4040      
Results:            
   
Maximum Potential Increase in ESALs (Life) w/Reinforcement (by Adding Geogrid to Unreinforced Section):    
  Layer Thickness SN Design Life
 
  SNi (ESALs) (yrs)  
Unreinforced Case:        
Asphalt (D1a):      
Asphalt (D1a):      
Base Course (D2):  
Subbase (D3):      
    Effective SN      
Reinforced with L.E. Geosolutions BX1515    
Reinforced with L.E. Geosolutions BX2525    
Reinforced with L.E. Geosolutions BX4040    
           
Maximum Potential Initial Cost Reduction w/Reinforcement (by Reducing Granular Layer Thickness to meet required ESALs (Life)):    
  Layer Thickness Effective SN Granular Layer Reduction
 
    (%)  
Reinforced with L.E. Geosolutions BX1515        
Asphalt (D1a):        
Asphalt (D1b):        
Base Course (D2R):    
Subbase (D3):    
Reinforced with L.E. Geosolutions BX2525        
Asphalt (D1a):        
Asphalt (D1b):        
Base Course (D2R):      
Subbase (D3):      
Reinforced with L.E. Geosolutions BX4040          
Asphalt (D1a):          
Asphalt (D1b):          
Base Course (D2R):      
Subbase (D3):      
             
Copyright©2018 L.E. Geosolutions, LLC All rights reserved V1.0 - 06-15 www.LEgeosolutions.com  
             
             

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