Tensar+ Geotechnical Design Software

No. Geogrid strength does not correlate to in-ground performance, which has been demonstrated in multiple studies (Watts et al., 2004 & Giroud & Han, 2006). The ability of the geogrid to interlock and confine the aggregate subjected to traffic loading is fundamental to deliver enhanced performance of the mechanically stabilized layer (MSL). This enhanced performance can only be measured through full-scale in-ground trafficking testing. Geogrid characteristics such as rib shape, aperture shape, polymer type and material structure configuration, rib thickness, in-plane stiffness, junction shape, geogrid-aggregate compatibility and many other factors are contributors to the amount of interlock and confinement achieved, and therefore, enhanced performance of the MSL.

TensarPave is Tensar legacy software that was downloaded directly onto a user’s PC and required a user to request manual codes to gain access on a periodic basis. This was also a design software but did not include the latest design methodologies. TensarPave could only be updated by a user reinstalling the software on their PC.

Tensar+ is cloud based so is accessible from anywhere any time. This allows you to see more accurately savings for time, cost, and carbon against alternative methods of construction. The software is updated daily to ensure that design methodologies and data are accurate. Tensar+ also includes newer design methodologies like LAAMS.

No, they don’t. Aperture shape and size are key parameters to allow interlock between the particles of the granular fill material and the geogrid. However, other geogrid properties such as the rib height, rib width, rib aspect ratio, rib material, geogrid in-plane stiffness, and relative location of the rib with respect to the center of mass of the granular fill particles are key to delivering improved performance of the mechanical stabilized layer (MSL). Having the right shape of rib is also fundamental to the performance of the system.

Tensar+ is free to use software which has been designed for commercial use. The user is given a royalty-free, non exclusive, non transferable license upon registration. Full terms of use can be found here: Tensar+ Terms of Use (tensarcorp.com)

Geogrids must have a minimum tensile strength to make sure the product is not damaged during the installation and compaction of aggregate. However, no correlation has ever been shown to exist between tensile strength and the performance of geogrids used for roadbed applications. This has been demonstrated in multiple studies (Watts et al., 2004 & Giroud & Han, 2006).

Learn more

No Tensar+ is a cloud-based software which means that you can access this online from anywhere. You do not need to download the software onto a PC or tablet for use, however, there is a Tensar+ app available for download for anyone wishing to use the software on their mobile device.

No, InterAx geogrids work differently than TriAx or BX geogrids because of InterAx’s unique structure, its wide range of aperture shapes and sizes, and the interactive outer layers. By having a geogrid structure with multiple aperture shapes and sizes, particles of different types of fill materials can interlock and interact more efficiently with InterAx. This geogrid/particle interaction is enhanced by InterAx’s interactive outer layers, which conform to the shape and angularity of the particles of the fill material. These characteristics enhance the load distribution onto the subgrade, mitigating subgrade deformation and early failure of the mechanically stabilised layer (MSL). Lastly, since different types of geogrids have different structures, material characteristics, and performance properties, geogrids are not interchangeable without revising the design.

Learn more

Signing up is simple and available to anyone. You will need to visit tensarplus.com website and click on the ‘Sign Up’ link. You will be asked to provide some information and then verify your email and that is it! You are then signed up for free use.

Biaxial geogrid was invented by Tensar in the late 1970s. Biaxial geogrids have square or rectangular openings, called apertures. Different types of biaxial geogrids exist on the market, but for roadbed applications, testing has consistently shown that integral geogrids made by a process known as punched and drawn perform best. In 2007, Tensar introduced multiaxial geogrids, known as TriAx. These geogrids have triangular apertures and ribs with a higher aspect ratio than biaxial geogrids. This geometry provides better interlock with the surrounding aggregate than biaxial geogrids, resulting in improved performance in stabilization applications. In 2021, Tensar introduced InterAx geogrids. InterAx builds on the decades of knowledge and testing at Tensar to deliver a higher level of performance. Through thousands of hours and millions of dollars of research and development, we combined advanced materials science, a revolutionary new geometry, extensive performance validation testing, and an entirely new design approach to deliver better solutions that are more economical, longer lasting, more resilient, and more sustainable.
 

Characteristic	InterAx	TriAx	BX
Development	InterAx geogrids were introduced in 2021, representing a significant leap forward in geogrid design and materials	TriAx geogrids were introduced in 2007, which marked an advancement in geosynthetic technology	BX geogrids have been around since the late 1970s
Generation	Third	Second	First
Aperture Geometry	Triangular, Hexagonal, Trapezoidal	Triangular	Square
Material Structure	Coextruded - Three Layers	Monolithic - Single Layer	Monolithic - Single Layer
Stabilization Direction	Longitudinal, transverse, and diagonal	Llongitudinal, transverse, and diagonal	Longitudinal and transverse
Performance	Best load distribution and interlocking capabilities with various types of fill materials	Adequate load distribution and interlocking capabilities	Limited load distribution
Performance Differential

No, Tensar+ offers you the best overall solution. If you want to look at something specific e.g. you have some tensar geogrid already on site then you can contact a member of the team who will be able to assist.

Geogrids are polymeric (plastic) construction materials used to confine and stabilise granular fill materials to increase their load distribution capabilities while reducing its potential to deform under load. Geogrids have openings called apertures, which allow for rock particles to strike through. This action is known as particle interlocking, and it allows for rock to become confined within the aperture.

 

Geotextiles are construction materials made from woven or non-woven polymeric (plastic) fibers. They can be used to provide filtration and separation, which restrains soil from mixing with adjacent materials due to dynamic forces. Geotextiles cannot confine granular fill materials, since there are no apertures to achieve particle interlocking.

Both modules use the T-Value methodology. The tracked plant module is developed only for BRE470 load case 1 & 2, whereas the working platform module is used for crane platforms and other platforms outside of BRE470.

Unless you are an expert in pavement design, it may be very difficult to evaluate all of the information that may be submitted to you – let alone find time to do so. Unscrupulous suppliers often try to take advantage of this fact by providing large quantities of information, even though it is not sufficient to show equivalency and may not even be relevant to the application. You can reduce the confusion by writing a project specific specification that includes the information outlined in the checklists we linked below – depending on the application (subgrade stabilisation or designing a pavement).

The non-stabilised section comparison is based on BRE470 calculations which can be found using the BRE470 methodology. 

Yes. There are different design methods and inputs for each design method. The allowable amount of permanent deformation also likely differs for both of these applications. They require different testing, and have significantly different failure criteria. Specifics on what to look for when comparing testing for subgrade stabilisation and paved road design can be found in the FAQ below.

Codes are used to protect the specification and ensure the correct product is used on site to meet the project specific requirements. The codes can be used in your specification and on drawings.

Performance is not based on index properties of the geogrid, measured in a lab. It is determined empirically, using full-scale in-ground trafficking testing. Request a copy of the design inputs and the design method which were used as the basis of equivalency. Also ask for the full-scale testing, with the specific product being submitted (not another “similar product”), and documentation from an independent authority verifying that the testing and calibration were performed properly. Once you have this information, you will be able to compare performance related sections and evaluate equivalency.

Download Subgrade Stabilisation Checklist

We have received feedback about the detail of the output which is something we are actively working on.

Performance is not based on index properties of the geogrid, measured in a lab. It is determined empirically, using full-scale in-ground trafficking testing. Require a copy of the third-party testing on which the supplier is basing its claim of equivalency. This testing should include Accelerated Pavement Testing (APT), performed on paved sections, following the procedures defined by NCHRP report 512. There should be multiple sections tested over different subgrade conditions and different pavement section thicknesses. Require a third-party review, by pavement design experts, verifying that the design values and methodology used are supported by testing for that product, and follow the guidance of AASHTO in R50-09 (“Geosynthetic Reinforcement of the Aggregate Base Course of Flexible Pavement Structures”). Also require third-party field validation testing, following AASHTO T221-90 (2012), to demonstrate that the results obtained in the field support the assumptions used in the design methodology, and that deformations are in line with predictions.

Download Pavement Checklist

Yes, if you head to your profile settings via your name in the top right corner - you will see an option to upload your company logo. This logo will appear on your output. Please remember to save your settings once yu have uploaded your logo.

• ASTM D1195. "Standard test method for repetitive static plate load tests of soils and flexible pavement components, for use in evaluation and design of airport and highway pavements." (2021).

 

• Berg, Ryan R., Barry R. Christopher, and Steven W. Perkins. "Geosynthetic reinforcement of the aggregate base course of flexible pavement structures." GMA White Paper II, Geosynthetic Materials Association, Roseville, MN, USA 130 (2000).

 

• Giroud, J.P., & Han, J., 2006, “Closure to Design method for geogrid-reinforced unpaved roads. I. Development of design method”, Journal of Geotechnical and Geoenvironmental Engineering, Vol. 132, No. 4, pp. 549-551.

 

• Saeed, A., and J. W. Hall. "NCHRP Report 512: Accelerated Pavement Testing Data Guidelines." National Highway Cooperative Research Program (2003).

 

• Watts, G.R.A., Blackman, D.I., & Jenner, C.G., 2004, “The performance of reinforced unpaved sub-bases subjected to trafficking”, Proceedings of the Third European Geosynthetics Conference EUROGEO 3, Munich, Germany, pp. 261-266.

The design solution is generally sensitive to low strength soil parameters, so in this instance please contact your local Area Civil Engineer for further support.

We're currently working on all of the remaining modules. If you are interested in a specific module, click on the subscribe option and you'll be the first to find out when this is available.

Each Tensar geogrid has multiple codes so this is not an error. Please use the code stated on your output and the correct grid will be delivered to site.