AAPA 2011 Study Tour – Surface Treatments #1 Surface Treatments #1.

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Presentation transcript:

AAPA 2011 Study Tour – Surface Treatments #1 Surface Treatments #1

AAPA 2011 Study Tour – Surface Treatments #1 Spray Seals o Preventative maintenance o Seal procurement/selection o Breakdown of seals used o Primerseals o Reseal practice o Fog sprays o Rejuvenation o Sand Seals o Seals unique to South Africa

AAPA 2011 Study Tour – Surface Treatments #1

AAPA 2011 Study Tour – Surface Treatments #1 Road Network Municipal (Council) Provincial (State) National (Federal) o South African National Roads Agency Ltd o Independent statutory authority owned by the South African Government

AAPA 2011 Study Tour – Surface Treatments #1 Road Network km paved 90% Spray Sealed Reseal rate - 7 to 12%

AAPA 2011 Study Tour – Surface Treatments #1 SANRAL Network Description Non TollAgency Toll BOTTotal Dual Carriageway Lane Undivided Lane Single Total % of SANRAL Network 81%11%8%

AAPA 2011 Study Tour – Surface Treatments #1 Preventative Maintenance Allocation of funding is optimised using modeling tools such as HDM4 and dTIMS Avoid worst first, preventative maintenance given priority. Roads in a poor state of repair are maintained in a safe condition (signing, lowering speed limits) until rehabilitation funding can be secured

AAPA 2011 Study Tour – Surface Treatments #1

AAPA 2011 Study Tour – Surface Treatments #1 Preventative Maintenance Extract the greatest value from maintenance funding to maintain the road in a good condition Economy of scale o 80km sections

AAPA 2011 Study Tour – Surface Treatments #1 Selection of Treatments Consultants perform investigation, design, tender documentation and site supervision A number of alternatives put forward from which a treatment is recommended Based on similar reasons to Australia o Cracking, traffic, texture, turning movements… o Reality check Road authority will assess the alternatives based on cost, motivation provided by Consultants, functionality, appropriateness and compare it with surfacings of adjacent sections on the same route

AAPA 2011 Study Tour – Surface Treatments #1 Seal Selection Seal type varies between authorities Western Cape Province

AAPA 2011 Study Tour – Surface Treatments #1 Seal Selection SANRAL Western Region

AAPA 2011 Study Tour – Surface Treatments #1 Sealing New Works Primersealing not practiced o Prime and seal o 50% dry back requirement o PMB emulsion double seals in winter Rehabilitation under traffic; build, prime and seal the road in half widths. Stop/go traffic control on the remaining lane operates 24 hours per day Undertaken on sections up to 4km in length.

AAPA 2011 Study Tour – Surface Treatments #1

AAPA 2011 Study Tour – Surface Treatments #1 Sealing Practice #1 Sealing embargo, May – August Use of cutters discouraged o Risk of bleeding in summer o Perceived OH&S issues Cutter added at depot/plant Maximum cutter levels o heavy traffic 3% o light traffic 5% o SANRAL does not permit any cutter

AAPA 2011 Study Tour – Surface Treatments #1 Sealing Practice # 2

AAPA 2011 Study Tour – Surface Treatments #1 Sealing Practice # 3 Measures to minimise stone loss o Spraying when pavement temperatures 25°C & rising o Use of emulsion binders o Aggregate precoating o Perform sealing in lane widths with work closed overnight. Rolling and sweeping the following day when the pavement has warmed. Traffic is only permitted on the seal when the pavement temperature is above 15°C. o Fog sprays

AAPA 2011 Study Tour – Surface Treatments #1 Fog Spray Diluted CRS60 emulsion (50:50) over final layer of aggregate Bind aggregate together, prevent early stone loss Alternative to prespraying, adds binder in lightly trafficked areas

AAPA 2011 Study Tour – Surface Treatments #1

AAPA 2011 Study Tour – Surface Treatments #1Rejuvenation Common treatment Oxidized binder Fill fine cracks Slow set emulsion Diluted 50:50 No design method o 0.8 – 1.0 l/m 2 o Trial patches 3 years life

AAPA 2011 Study Tour – Surface Treatments #1

AAPA 2011 Study Tour – Surface Treatments #1 Sand Seals Graded sand or grit Low volumes roads Initial seal - 3 years Reseal - 15 years

AAPA 2011 Study Tour – Surface Treatments #1 Sand Seal

AAPA 2011 Study Tour – Surface Treatments #1

AAPA 2011 Study Tour – Surface Treatments #1

AAPA 2011 Study Tour – Surface Treatments #1 End of Part 1