ROAD PAVEMENT FORUM

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ROAD PAVEMENT FORUM RECENT EXPERIENCES ON PPGS
PROJECTS

• HISTORY
• 1993 RPF (BMLC) PPGS Task Group Formed
• 1994 CAPSA Resolution to promote concept
• 1996 Initial SANRAL Pilot Project
• 1999 CAPSA Papers on PPGS issues and initial
  projects

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RECENT EXPERIENCE WITH PPGS
DISADVANTAGES (CONSTRAINTS) IDENTIFIED AT CAPSA
1999

• Acceptance of change in roles of employer and
  contractor

• Lack of contractor quality assurance systems

• Lack of contractor design skills

• Shortcomings in establishment of appropriate and
  attainable
• performance acceptance criteria

• Shortcomings in methods for specifying and
  measuring
• performance

• Selection of realistic performance guarantee
  periods

• Selection of appropriate guarantee sums

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RECENT EXPERIENCE WITH PPGS

• N3/1 PROJECT
• Length 8,8 km of 3 to 4 lane freeway
• Pavement History 40mm AS (1985)
• 40mm AS
• 120mm BC
• 150mm C3 (1974)
• 150mm C4
• G7
• Traffic AADT 105 000
• ADTT 5 000
• Accumulative traffic (1974 2000) 25 x 106
  E80/direction
• Remaining Structural life gt 15 years
• Functional distress - rutting
• - surface cracking
• - riding quality

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N3/1 PPGS
DELIVERABLES OF PROJECT

• To limit ingress of surface water into the
  pavement

• To remove all rutting 6mm

• To improve and/or strengthen the pavement where
  visible
• distress is evident

• To improve riding quality and skid resistance

• To provide a medium to long term maintenance
  free and
• serviceable surface

• To minimise noise generated by vehicles

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N3/1 PPGS
CONTRACTORS OBLIGATIONS Contractor to submit the
following with his tender

• Quality Assurance Plan

• Use of professional partner

• Technical report (Pre-treat/repair method,
  product selection etc)

• Design constraints for PPGS related products

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N3/1 PPGS
FUNCTIONAL PERFORMANCE PROPERTIES
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N3/1 PPGS
Acceptance Criteria for roughness
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N3/1 PPGS
Guarantees
PPGS Defects Liability Period 6 years (after
issue of completion certificate
Performance assessment periods 2, 4 and 6 years
Product performance guarantee R4 500
000.00 R 1 500 000.00 release of year 2 R
1 500 000.00 release of year 4 R 1 500 000.00
release of year 6
Lane rental (after 4 years) R 500.00 / hr /
lane km
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N3/1 PPGS
C10.01
C10.02
C10.03
C10.04
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N3/1 PPGS
TENDERS RECEIVED
Contractor A (Alt) Accepted
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N3/1 PPGS
COMPARATIVE COSTS CONSTRUCTION
Lowest tender PPGS - R24,374 m
Lowest conventional tender - R22,882 m
Premium for PPGS - R 1,492 m
SUPERVISION
Supervision costs on PPGS project 5
Supervision costs are recently completed
conventional project of similar nature and scale
8,7
Savings in supervision costs R0,90 m (3-4 of
contract value)
Overall premium R600 000,00
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N3/1 PPGS
CONCLUSION CAPSA 1994 resolution PPGS is
necessary for the development of cost-effective
transportation infrastructure in South Africa.
PPGS should be developed and implemented
incrementally with due recognition of the
principles of RDP and the need for education in
the concepts of PPGS (paradigm shift). This will
be necessary in order to prevent PPGS from
developing into a barrier for the entrance of
smaller entrepreneurs into the market. Are we
achieving this?