The small gaps or joints between pavers, nominally 3-4mm wide, are to be filled with a fine sand material.
The grading of this jointing material is different to the bedding sand.
As with bedding material, the use of a cement joint is not recommended in a flexible pavement application.
The filling material should be washed free of soluble salts or contaminants which cause or contribute to
efflorescence, and additionally stain the paving surface.
Care should be taken to select a sand which will not stain the paving units.
If in doubt, conduct a site trial, by simply placing a wet sample of sand on the paving unit for a 24 hour
period and then examining the degree of staining on the nominated paving unit and making an assessment of
its suitability as a jointing sand.
The filling material can benefit from containing a small amount of dry clay or silt fines passing the 75
In this way, early water ingress through gaps or joints can be controlled.
A typical grading envelope for joint filling material is as follows:
Where used, an amount of fines in the range of 5-10% has been found to give good results.
As soon as is practically possible after bedding compaction, and in any case prior to the termination of work
on any day, dry sand for joint filling shall be spread over the pavement and the joints filled by brooming.
Complete joint filling is difficult when either the pavement or joint filling sand is damp, or where
the paving has been laid light with a "zero" joint gap.
To ensure complete filling of joints, both the filling sand and the paving units shall be as dry as practicable
when sand is spread and broomed into the joints.
Prior to acceptance for opening to traffic, all surfaces and pavement structures shall be true to levels, grades,
thicknesses and cross-sections shown on drawings.
All pavements shall be finished to lines and levels nominated to ensure positive drainage to all drainage outlets
The pavement shall then receive one or more passes of a plate compactor as necessary and the joints shall then be
refilled with sand as necessary to ensure the joints are completely filled.
The pavement shall be inspected at regular intervals after reaching a stage of practical completion and during the
maintenance period to ensure that all joints remain completely filled.
Pedestrian and vehicular traffic should be encouraged to transverse the greatest possible areas of the pavement as
soon as practicably possible to assist in setting up the structural integrity of the pavement.
Once joints are refilled, the pavement is ready to receive traffic.
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