Presentation on theme: "Tarmac Jan Vincenc Presents. General information Tarmac (short for tarmacadam, a portmanteau for tar-penetration macadam) is a type of highway surface."— Presentation transcript:
Tarmac Jan Vincenc Presents
General information Tarmac (short for tarmacadam, a portmanteau for tar-penetration macadam) is a type of highway surface. Strictly speaking, Tarmac refers to a material patented by E. Purnell Hooley in 1901 Definitions Bitumen - a product of the oil-refining and petro-chemical industries. Asphalt - a mixture of bitumen and minerals (in Europe) - in USA this term is used for what we in Britain use as bitumen
Types of material There are literally dozens of diffferent types of 'tarmac'. Different aggregates, different aggregate sizes, different binders, different binder colours. Preparation prior construction : Excavation. The surface needs to be dug off to a depth of at least 175mm. The depth of dig can be roughly calculated as.... All figures are in millimetres. Image used from :
Construction Wearing courseWearing course Layer that is used and need to be pretty smooth for the users, 20-25mm thick when rolled Base course (s)Base course (s) Strengthening layer of the pavement and should be at least 40mm, preferably 50mm thick. Load bearing. Sub-baseSub-base This is essential if the pavement is to last longer than a couple of years. Sub-gradeSub-grade As above, both of these may be as one layer, for that reason the membrane is optional. Image used from :
Finishing-off All bitmac and asphalts are consolidated by rolling. This may be a single-drum walk-behind roller, a ride-on twin-drum roller or, on the larger jobs, a full-sized, triple-drum road roller. Only in very constricted areas will a hand-roller or vibrating plate compactors be used. Tarmac should be sufficiently cool and hard enough to be trafficked 1-6 hours after being laid.
Environmental impact Rock extraction – Quarry…. Lean Aggregate Handling Lean Quarry Liskeard Horningtops PL14 3QD Asphalt…… Lean Asphalt Lean Quarry Liskeard Horningtops PL14 3QD Impact in countryside, pollution from road transport as this material has to be shifted around. Also by transporting the material around the road surface is worn and in due course has to be replaced by the finishing product. Air pollution from transporting, pollution from the process of turning the oil into asphalt, also from another transporting for mix. Conclusion…….. Tarmac Limited Liskeard The good news is that in USA up to 80% of road surface is being recycled.
Costs For guidance only, because prices vary through-out United Kingdom. Full costs includes handling of material, extraction of soil and handling of the soil. It also includes the necessary planting and labour hired for the job. Kerbs and edging are not included although VAT is.
Garden Use Too expensive on small scale. Unsafe as if not frequently used, moss and algae will show up and the path will become very slippery. Possible use is a driveway in front garden, or path through front garden from main road to your house. Perfect example >
Suppliers Welton Aggregates & Surfacing Limited Address: Rookery Farm, Welton-le- Marsh, Spilsby, Lincolnshire, PE23 5SX, UK Telephone: (0845) Fax: (01754) Tarmac Limited (Co. No ) Address: Millfields Road Ettingshall Wolverhampton West Midlands Wv4 6JP Tel: (01902) Tarmac is the leading supplier of heavy building materials in the UK, providing solutions in all areas of everyday life, for everyone. With many suppliers and depots, e.g. Liskeard with it’s quarry and asphalt produce it comes handy as local supplier.
Information Used TRISTAN BEALE’S work on Tarmac as guideline. Clip art The end……...???