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Over recent years, there has been increased concern over rising CO2 emissions worldwide. Through The Climate Change Act, the UK government has responded by establishing a legally binding target to reduce the UK’s greenhouse gas emissions by at least 80% below base year levels by 2050. Since 2007, the UK government’s planning policy statement states that the design of any future development should be planned to limit CO2 emissions.


The Tensar Carbon Calculator using Tensar TriAx® geogrids estimates the percentage construction CO2 saving by comparing a Tensar mechanically stabilised layer (MSL), evaluated using the TensarPave™ Ground Stabilisation design method, with a non-stabilised unbound granular layer of equivalent performance.


When specifying an unbound granular layer using a Tensar mechanically stabilised layer (MSL), your project benefits from:

    • Reduced quantities of natural aggregate used
    • Reduced volumes of excavated material
    • Fewer lorry loads visiting the site
    • Reduced compaction 

All of these reductions enable a saving in construction CO2 emissions.

Taking into consideration the carbon cost of manufacturing Tensar TriAx geogrids and delivering the geogrids to site, Tensar’s Carbon Calculator works out the potential construction CO2 savings generated by reduced aggregate volumes, excavated material, lorry loads and compaction when using a Tensar mechanically stabilised layer.  Savings of up to 50% can be achieved compared with a non-stabilised unbound granular layer of equivalent performance.  Tensar’s Carbon Calculator has been developed and checked by Coffey Geotechnics and their assumptions published accordingly.