Cardiff city council Penarth road and Mercia road

Glaspave 50 used in the right circumstances is a valuable tool for highway engineers in managing their highway asset effectively

Cardiff City Council

Client: Cardiff City Council
Consultants: Internal
Site: Penarth Road and Mercia Road Cardiff

Quantity: Penarth Road 1000 sq m Mercia Road 1200 sq m
Product: GlasPave 50
Date: Penarth Road June 2012 Mercia Road June 2017


Penarth Road is a semi industrial road serving industrial and retail units. It is a jointed concrete carriageway with the concrete bays being 7m lengths. In the summer of 2012 Cardiff City Council undertook a trial to investigate whether a geotextile used in conjunction with a premium micro-asphalt system would extend the life of the micro-asphalt system from cracking failure.

Asphalt Reinforcement Services supplied and installed the geotextile of 8kn strength directly to the concrete with a 160/220 pen bond coat. The micro-asphalt system was laid in 2 layers with a final nominal thickness of 15mm achieved. There were control sections incorporated within the project where no geotextile was installed.


Within 3-4 months the control sections had started to crack over the construction points within the concrete. The reinforced sections extended the pavement life, and only after 4 years are showing signs of cracking through over the joints.

Gareth Jones Highways engineer for Cardiff City Council commented that the geotextile had significantly extended the life of the micro-asphalt and that the cracking now present over the joints in the reinforced section were significantly less pronounced than those in the control sections without the geotextile.


Following the success on Penarth Road, the system was installed on Mercia Road, Cardiff an estate road which is cracked and seated concrete overlaid with a 30mm DBM (dense bituminous macadam) in the summer of 2017. Options to deal with this road were limited, therefore introducing the geogrid under a micro asphalt layer was seen as cost effective solution to help stop further deterioration. Asphalt Reinforcement Services installed GlasPave 50 a reinforcement system with 50kn/50kn tensile strength directly to existing asphalt surface which was displaying cracking failure.

The GlasPave 50 was used in conjunction with 160/220 pen bond coat before being overlaid again with the micro-asphalt system in 2 layers to a nominal thickness of 15mm. Both installations were undertaken successfully and although only 7 months on the early signs are positive with no cracking evident in the carriageway.

Gareth Jones commented that Glaspave 50 used in the right circumstances is a valuable tool for highway engineers in managing their highway asset effectively.