LDEG Forum Subdivision Surfacing Subdivision Surfacing 2 - - PowerPoint PPT Presentation

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LDEG Forum Subdivision Surfacing Subdivision Surfacing 2 - - PowerPoint PPT Presentation

Mar 12, 2024 104 likes •627 views

LDEG Forum Subdivision Surfacing Subdivision Surfacing 2 Subdivision Surfacing 3 Subdivision Surfacing 4 Subdivision Surfacing 5 Subdivision Surfacing 6 Subdivision Surfacing 7 Subdivision Surfacing 8 Subdivision Surfacing 9

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LDEG Forum

Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

First Coat Seals

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

Specification – Quality Control Hold Points

  • Weed spraying
  • Pavement Testing
  • Profile Check
  • Seal Design and Construction Plan
  • Street Furniture Protection

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Sealing Specification

NZTA P/3

  • 1970’s Method Specification
  • Engineer is responsible for seal design
  • Shall be180/200 base binder
  • Hot Cut Back – Kerosene and Adhesion Agent
  • Engineer handover
  • Protection of Road Furniture
  • Shade Air not less than 10ºC

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Subdivision Surfacing

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Subdivision Surfacing

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Technical requirements

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Subdivision Surfacing

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Technical requirements

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Subdivision Surfacing

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Acceptance of Treatment

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Subdivision Surfacing

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Single coat Racked in Two Coat Dry Lock

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Bitumen

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  • Different Penetration grades

180/200 130/150 80/100 60/70 40/50

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Binder Is the mixture of bitumen and spraying additives.

  • 1. Kerosene
  • 2. Diesel or AGO
  • 3. Polymer
  • 4. Adhesion Agents
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The ‘Viscosity’ of a liquid is it’s resistance to flow. For bitumen binders, we need to reduce it’s viscosity so we can:

– pump it. – spray it.

We reduce the viscosity by:

– Heating 170 C

OR

– Emulsifying

Viscosity

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Environmental / Sustainability

“Approximately 20% of the added kerosene evaporated while being sprayed, and 30% within 2 hours following application.”

Page 94 C h i p s e a l i n g i n N e w Z e a l a n d

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  • ADHESION: bituminous binder,

sticks to the surface of a solid body, e.g. chip. It arises through intermolecular attraction between the contract surfaces.

  • COHESION: the ability of a

material to resist, by means of internal forces, the separation of its constituent particles