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High PSV on Auckland Motorways. Bruce Chappell, AMA Glynn Holleran, AMA. Central Motorway area 200,000 vpd Areas of ramps and mainline require PSV >65 Mainline requires high texture surfacing for spray suppression and skid resistance - OGPA

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high psv on auckland motorways

High PSV on Auckland Motorways

Bruce Chappell, AMA

Glynn Holleran, AMA

the problem
Central Motorway area 200,000 vpd

Areas of ramps and mainline require PSV >65

Mainline requires high texture surfacing for spray suppression and skid resistance - OGPA

Default in the past has been to use PSV65 Motouhora aggregate

Now AMA uses slag in OGPA on mainline

Slag does not provide PSV to old or new T/10

The Problem
the problem continued
For some ramp areas and low speed high volume SH mainline lanes, T/10 also requires PSV of high skid resistance surfacing (HSRS).

But for long term performance HSRS’s rely on a compatible pavement underneath, i.e.

structurally sound

no cracking or differential thermal movement

Many sites failed to provide long term value

The Problem continued
the solution
For mainline areas use slag in OGPA and monitor skid performance (SCRIM survey)

For ramps and low speed areas check crash history to determine whether slag is an option

Consider the pavement structure, is it suitable for HSRS?

Compare whole of life costs for two options:

HSRS surfacing with structural fix if required

Slag aggregates in asphalt and replace more often

The Solution
the solution continued
Accept slag option fails T/10 PSV requirement

Slag option is less than half calcined bauxite cost (without a structural pavement repair).

Does HSRS give twice or better the life?

Not without a compatible pavement (risk)

Not if poorly constructed (risk)

AMA proposes to implement best whole of life option that meets safety requirements.

The Solution continued
slag aggregates
Slag Aggregates
  • More cubical
  • High PSV
  • Consistent
  • Cost effective
  • Recycled base material
  • High Surface friction
slide7

Properties

  • Crushing resistance less than 10% at 230KN (NZ 4407 Test 3.10)
  • Weathering Quality Index: 98.2 (NZ 4407)
  • Cleanness Value: 95 (NZ 4407)
  • Quality Index: AA (NZ 4407)
  • LA Abrasion Test: 18% (NZ 4407)
  • Wet Dry strength variation: 3 max (NZ 4407)
development trials
Development Trials

Slag aggregate over 5 years similar performance to calcined bauxite

slide9

Browns Road Trial

  • British Pendulum Skid (TNZ Test T/2)
  • Conventional: 84 -90
  • Slag : 94-97
  • Calcined Bauxite: 95-98
  • PSV
  • Calcined bauxite: approx 70
  • Slag : 63-65
  •  Now 3 years old- no accidents due to surface- formerly black spot
slide11

Hillsborough Road

Asphalt Base Line

slide12

Grip Tester

Now 2 years old- no accidents due to surface- formerly black spot

slide16

Slag makes good mixes

  • SMA used SH20,NGA AMA
  • OGPA used NGA and AMA
sma in practice
SMA in practice
  • Kirkbride Road
  • Heavy traffic
  • Maintains scrim results
  • Is made with Slag SMA