LDEG Forum Subdivision Surfacing Subdivision Surfacing 2 - PowerPoint PPT Presentation

LDEG Forum Subdivision Surfacing

Subdivision Surfacing 2

Subdivision Surfacing 3

Subdivision Surfacing 4

Subdivision Surfacing 5

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Subdivision Surfacing 9

Subdivision Surfacing 10

Subdivision Surfacing 11

Subdivision Surfacing 12

Subdivision Surfacing 13

Subdivision Surfacing First Coat Seals 14

Subdivision Surfacing 15

Subdivision Surfacing 16

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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 30

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 31

Subdivision Surfacing 32

Subdivision Surfacing Technical requirements 33

Subdivision Surfacing Technical requirements 34

Subdivision Surfacing Acceptance of Treatment 35

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Racked in Single coat Two Coat Dry Lock

Bitumen 41

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• Different Penetration grades 180/200 130/150 80/100 60/70 40/50

Binder Is the mixture of bitumen and spraying additive s. 1. Kerosene 2. Diesel or AGO 3. Polymer 4. Adhesion Agents

Viscosity 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

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

• 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