Additional Information

South Afircan roads are built using a layered pavement  system. A road is built from the bottom up, layer by layer, each layer  increasing in strength and is sealed using a bituminous or concrete  surface.

Ecobond is a system in which bitumen emulsion is combined with a resin thereby improving its engineering properties.

Ecobond is not a road surfacing. It is used beneath the  blacktop/bituminous seal to improve the bearing capacity of the base  course and lower layers.

Presently bitumen is plastic (visco-elastic) like soft  putty or plasticine, it does not return to its original shape and a road  will rut and deform under repeated loads. Using Ecobond makes bitumen  stabilization much stronger (e.g. from 0.8MPa bitumen stabilisation to  6.9MPa UCS equivalent), elastic so that it can bend and return under  loads and improves the water resistance (e.g. absorbtion reduced from 8%  to 0.4% with 1% resin added). 

Ecobond also reduces temperature  sensitivity of Bitumen.

It is often water that breaks a road and Ecobond helps  to keep the road layers dry. It also improves bitumen performance when  using sand, especially fine sand (5MPa UCS north KZN fine sand) which  would normally be considered a marginal material.

There are three conventional stabilizing materials with  effective results, they are well researched and well documented: cement,  lime and bitumen. Cement is brittle and needs several layers to prevent  it cracking which takes time and costs money to construct. Lime needs  clay for best results, not usually found in base courses. Bitumen is  visco-elastic (permanently deformable) but becomes much better when used  with Ecobond making it elastic and stronger. Partially Bound Ecobond  stabilized aggregates (higher binder content and resin to bitumen ratio)  are used as cemented base courses (e.g. TRH designs) 

Better roads can be constructed at standard costs or  costs can be reduced by using less chemicals at the same or increased  durability.

The 100mm thick Ecobond base at Duvha, Witbank, has  carried approx. 30 MESAs (million equivalent standard axles) since 1996  and is in excellent condition. The three year old adjacent conventional  road had approx. 100 potholes from Feb. to May. 2011 and the 15 year old  Ecobond section had none.

  • Strength: C4 < 1,5 MPa, C3 < 3  MPa, C2 < 6 MPa, C1 < 12 MPa equivalent soaked UCS has been  attained, ITS strengths: BSM1 , BSM2 & BSM3 can be attained (as per  TG2 2009, 24 hour soak). Does not cause shrinkage cracking.
  • Water resistance: up to 6,35 x 10-7  cm/s water impermeability, 2 – 6 times less water absorption than  standard bitumen stabilization samples have been recorded.
  • Elasticity & tensile strength:  Improves the elastic strength of bitumen emulsion (to counter  visco-elastic behavior or permanent deformation) and can bend and return  (can be adjusted through variation of binder content and resin to  bitumen ratio). 
  • Workability with a wide variety of soils, even fine sand. This can often reduce material import costs and construction time.
  • Adaptable to requirements: Ecobond  can be applied as a non-continuously bound, partially bound or bound  pavement layer, depending on the aggregate, binder content and ratio of  resin to bitumen used.


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Techneco (Pty) Ltd

171 Clifford Rd, Murrayfield Ext. 1, Pretoria, Gauteng 0184, za