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
Client: Cardiff City Council
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
PHASE 1 – CONTROLLED GEOTEXTILE TRIAL
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.
A CRACKING SUCCESS
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.
PHASE 2 – GLASPAVE 50 ROLLED OUT
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.