Quiet Joint Solves Clients Headaches in Al
Pitchmastic PmB International delivers simple, quick, durable
and quieter joint solution.
As part of the ongoing maintenance works within the Al Ain
Municipality, Dawoodi Bridge a 55 metre long span concrete arch
bridge is being rejuvinated by the removal of the expansion joints,
roadway repairs and a new footway/median reconstruction.
Al Ain also known as the Garden City due to its greenery is the
second largest city in the Abu Dhabi Emirate and the fourth largest
city in the United Arab Emirates. With a population of 374,000
(2009), it is located approximately 160km east of the capital Abu
Dhabi and about 120km south of Dubai.
The exisitng joints which were in place on the bridge had failed
due to various inadequancies and were casusing deformation to the
adjacent asphalt. In view of this the engineer asked for an
alternative expansion joint solution. Pitchmastic's extensive track
record in the region meant they were approached and asked to put
forward their recommendations for the most appropriate joint system
for the project.
The key criteria for the joint replacement solution:
- Durabilty at elevated temperatures
- Low noise as sensitive residential area
- Quick to install and return to service time
- Ability tro span joint widths of up to 1.0m without needing to
replace the existing asphalt
Pitchmastic PmB International proposed their Advanced (ANJ)
expansion joint system. A surface mounted noisng joint, comprising
of a pre-formed compression seal, bonded between high strength
nosing's which are widely used in the UK and in other parts of the
world on highway structures. This type of joint is ideal for
movement up to +/-20mm, is more durable than the current system and
would not suffer the same symptoms as the problematic joint.
After careful consideration and in-depth meetings with various
members of the municipality and main contractor, Pitchmastic's
Advanced Nosing Joint was chosen ahead of the other options as it
is seen as the ideal solution because of key company and product
- Proven track record in Middle East Regions
- Local experience and reputation
- International approvals and accreditations
- Warranty for installed materials
- Short lead time as project required early start
- Limited return to service time as major artery in Al Ain
traffic disruption had to be kept to a minimum
- Client was not happy with alternative materials such as modular
elastomeric due to installation times and noise issues
- Durability in heavily trafficked region with deck temperatures
up to 70*C in summer months
Constraints of the contract meant completion was key as the road
had to be open in time for the EID holiday religious festival.
The scheme comprised of placement of crossover to enable traffic
to be switched onto seperate carriageway to allow works to proceed
on closed lanes. Once these changes were implemented removal of the
existing mechanical comb type and bedding compounds were
undertaken. The exposed joint was then prepared by scabbling. Once
the deck was cleaned and prepared saw cutting of the exisitng
aspahlt was undertaken to allow neat termination of the new 'ANJ',
ready for the placement of the polystyrene joint filler and former.
The 'ANJ' resin mortar was mixed on site and then placed into the
prepared trench in the carriageway and trowelled flush with the
surfacing. To reduce hydraulic pressure, drainage was placed at the
base of the joint and through the air gap. In order to increase
skid resistance an anti skid finish was then applied to the exposed
surface of the joint. The final procedure was the installation of
the elastomeric insert using compressed tongs.
The scheme completed in time, opened to traffic 24 hours ahead
of schedule, on budget and to the complete satisfaction of the