MANUAL 4 - Construction Industry Development Board

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MANUAL 4 – BITUMINOUS PAVEMENT SEALS • Concrete mixer 150/200 Photo 4.15: Emulsion drum stand • Suitably sized vibratory pedestrian roller (Bomag 75 or equivalent) • 500 litre water tank on trailer or back of LDV • Steel-framed stand for drums with steel or timber ramps (Photo 4.15) • 75 mm diameter ball valve for decanting emulsion from drums (Photo 4.15) • Motorised hand sprayer and spray screens (Workshop drawing LIC 007) if necessary for applying tack coat to the base (Photo 4.16) Photo 4.16 IMPLEMENTING EMPLOYMENT INTENSIVE ROAD WORKS 39 MODULE 1 2 3 4 5 6 7
MODULE 1 2 3 4 5 6 7 6 MANUAL 4 – BITUMINOUS PAVEMENT SEALS 4. Construction 4.1 Preparation of surface of base • Sweep the road clean. All loose material and mud that has been brought onto the surface by traffic must be removed. • Stake out width of road to be surfaced, marking out the centre and edge of the road with a chalk line. • Before any slurry is placed, the spreading team must check and rectify the levels of the base, before laying the 10 mm thick slurry to give a final thickness of 6 mm for the slurry surface. • Place the 10 mm rails along the centre line or quarter points and on edge of the road, and check the accuracy of the base levels and remove any high spots where a cover of less than 8 mm is obtained. Isolated low spots can be accommodated with extra slurry, up to a maximum of 20 mm. Large aggregate in the base can be treated with a 2 kg hammer to ensure a minimum of 8 mm cover. • If necessary, lightly spray the surface with a diluted 1: 6 emulsion (1 litre emulsion to 6 litres water). Normally with an ETB, this should only be necessary if the road has been exposed to traffic for an extended period. This application of emulsion and water could be regarded as lightly tacking the surface (only necessary if surface is scuffed and dry). • Protect any kerbs, drains, etc. from the emulsion spray. (Photo 4.17) • Use reinforced paper for the construction joints at the beginning and end of each spray. Photo 4.17: Protection of kerbs, drains, etc. IMPLEMENTING EMPLOYMENT INTENSIVE ROAD WORKS 40
Page 1 and 2: Implementing employment intensive r
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Page 5 and 6: Overview of the practice manuals Th
Page 7 and 8: MANUAL 4: Bituminous pavement seals
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Page 35 and 36: MODULE 1 2 3 4 5 6 7 Rate of binder
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Page 41 and 42: MODULE 1 2 3 4 5 6 7 Typical spread
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Page 59 and 60: MODULE 1 2 3 4 5 6 7 Slurry seal wo
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MODULE 1 2 3 4 5 6 7 MANUAL 4 - BIT
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eferences The framework agreement f
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Notes
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MANUAL 4 - Construction Industry Development Board

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