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AS 4049.5-2007 pdf free download

AS 4049.5-2007 pdf free download.Paints and related materials Pavement marking materials
Part 5: Performance assessment of pavement markings.
11w first application of a marking system may demonstrate different performance to subsequent applications of the same system. The performance of a marking system will be influenced by the material type, road texture and the condition of the pavement and any existing markings.
The application of a pavement marking system over an existing marking may lead to compatibility issues. An effort therefore should he made to identify the type of cisting markings in order to minimize the risk of failure.
Pavement iiiarking systems perform best when applied over clean, dry surfaces that are free from contaminants. (‘ontanlinanis such as oils may lead to adhesion problems between some marking systems and the substrate. Adhesion may be enhanced by the use of a primer. wet or dry blast cleaning or abrasion of the road surface.
Pre-treatment used on aggregate to promote flow, and for bitumen adhesion during reseals. can lead to adhesion difficulties with some marking systems. Additional weathering time will assist the wearing of residual pre-treatment additives.
Some concrete curing membranes commonly used in the concrete construction industry will result in loss of adhesion with some marking systems. Effort should thereftwe be made to determine the type of concrete curing membrane used during construction in order to determine compatibility.
Priming or etching of smooth substrates may be required to assist adhesion of sonic marking systems.
The visibility of a marking is dependant upon a number of factors, but of particular importance is the contrast between the marking and its surroundings. The use of concrete pavements or light coloured aggregates with spray seals can reduce the contrast significantly, thereby limiting the performance of a marking. It is important that pavement luminance, or the amount of light reflected by a pavement surface, is taken imito account when specifying a pavement marking system. It is recommended that the end-point retroreflectivity specified for a marking. in wet or dry conditions, be a minimum of lOO mcd/m2/lx above that of the surrounding pavement in order to ensure adequate visibility for the road user.AS 4049.5-2007 pdf free download.

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