IrandiPRO - PAVEMENTS - Pavement components & Typical pavement design

The purpose of the edge restraint system is to ensure that movement of the edge course is limited whilst dynamic loads resulting from use of the paved surface are imparted to the pavement structure. This ensures the integrity of the paved surface is maintained and kept looking as good as the day it was installed.

TYPICAL LIGHT DUTY PAVEMENT STRUCTURE:

Subgrade – Insitu pavement formation
Base – Imported material with thickness dependant on the strength of the sub-grade and anticipated loading imparted to the pavement.
Bedding Sand – Sand Layer installed above base to aid in providing a smooth laying surface.
Block Pavers – Precast concrete or clay.
Edge restraint – IrandiPRO System nailed to granular base.

COMMON CAUSES OF FLEXIBLE PAVER SYSTEM FAILURE:

Insufficient base depth for imposed loading.
Poor compaction of the pavement layers.
Insufficient base extension beyond the edge of the paved surface.
Bedding sand layer uneven or too thick.
Edge restraint failure.

TYPICAL LIGHT DUTY PAVEMENT CONSTRUCTION:

The below schedules illustrate typical light duty construction thicknesses against varying California Bearing Ratio (CBR) ranges for light duty residential uses.

TYPICAL PEDESTRIAN ONLY
Surface Options		Block Pavers		Concrete Flags
Layers	Surfacing	> 50mm		400x400x65mm
	Bedding Sand	25mm Compacted		25mm Compacted
	Granular Sub-base	200	150	125	100	Nil
	Subgrade CBR (%)	< 2	3	4	5	> 6

TYPICAL LIGHT VEHICLE
Surface Options		Block Pavers		Concrete Flags
Layers	Surfacing	> 50mm		400x400x65mm
	Bedding Sand	25mm Compacted		25mm Compacted
	Granular Sub-base	275	230	200	175	150
	Subgrade CBR (%)	< 2	3	4	5	> 6

Above pavement thicknesses to be treated as a guide only, exact requirements pending insitu ground conditions and detailed design by Project Engineer.
Above pavement thicknesses based on CMA Book 2 – Design Aspects & BS 7533, Part II – Guide for the Structural Design of Lightly Trafficked Pavements Constructed of Clay Pavers or Precast Concrete Paving Blocks guidance.
For CBR ranges <5 % the sub-base and subgrade should be separated by means of a suitable geotextile.
The granular sub-base should extend beyond the edge of the paved surface at a length equal to the depth of the sub-base.
Topsoil should never form part of the pavement structure.
Subgrade compaction – 90% Mod AASHTO
Granular base compaction – 93% Mod AASHTO

ADVANTAGES

Advantages over traditional installation

GUIDES

Quick how two guides on requirements, safety, preperation and installation