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The generic term for all these types of materials is Asphalt. There can be many different recipes or mixes depending on the job. Binder Course, Base and Sub-Base materials are used on top of the Sub-Grade, these layers make up the majority of the road construction and they distribute the traffic load from the Surface Course. |
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Surface Course 40mm Binder Course 60mm Base 150-240mm Sub-Base 150-750mm Sub-Grade Starting Point |
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The Surface Course is the part of the construction in which Tullyraine specialise because of the nature of our aggregate. This is known as Gritstone and has good wearing and resistance to skidding properties. The Surface Course is the part of the road in contact with the vehicle tyres, it must offer up skid resistance, be impervious and have a fine tolerance to produce a smooth running surface. The whole construction is known as a pavement. Our aggregates are rolled into the surface of hot rolled asphalts and we have supplied these aggregates to various other surfacing companies throughout Ireland and the Uk. The production of coated material takes place through a computer controlled asphalt batching plant the process is the same for all types of material but the amounts and types of raw material used |
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| will vary, for instance we introduce a lime filler in asphalt wearing course which is not present in bitumen macadam road base. Aggregate is drawn into a heated rotating drum or dryer. It is heated to around 150°C, then is screened out into its various sizes and stored in hot bins above the mixer. The operator, via the computer control system, weighs out the correct amount of each aggregate size, bitumen, filler and any other additive for the given mix. Each constituent is placed into the mixer and, after a mixing cycle of around 45 seconds, drops into a lorry. |
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