REFLECTIVE-MIX MARKINGS
(Patent Pending PCT/SG01/00225)

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Papers Submitted By 
Michael Lazar and John Emery

INTRODUCTION

The markings especially on concrete surfaces with traditional paint or thermoplastic materials have performed in many instances as specified. However, maintaining these markings is difficult and the cost has been on the increase over the years. These markings have to be repainted frequently to retain its effectiveness. The duration of such repainting could very form 6 to 18 months depending on the usage and site condition.

The cost of maintenance has been on the increase. Authorities concerned with such markings are constantly looking at other methods or markings that could reduce the need for frequent repainting and the cost.

The thermoplastic markings are well suited for bituminous surfaces for which they were formulated. Such markings also provide the users with quick drying time and access to areas that is critical for the movement of traffic.

Over the years, concrete and concrete block pavement has become a substitute in some areas where bituminous surfaces have failed to meet the requirement. Thermoplastic or paint markings were applied as required on the concrete surfaces. Such markings formulated for bituminous surfaces have not performed well on concrete block surfaces.

The main problems associated with paint or thermoplastic markings on concrete surfaces could be summarised as follows:

1 Poor adhesion
2 Chaffing
3 Rapid wear
4 Poor skid resistance
5 Re-application on the causes the markings to be uneven and weakens the adhesion
6 Frequent re-application required to maintain the markings
7 Increased maintenance cost
8 Emits toxic vapours during preparation for application
9 Breathing apparatus must be worn by applicators
10 Pollutes the environment
11 Poor visibility in adverse weather conditions

MARKINGS FOR CONCRETE SURFACES USING REFLECTIVE- MIX

Reflective-mix that is used in the production of reflective concrete blocks could be used to cast the required demarcation lines and directional signs to pro-long the life-span and reduce the maintenance cost of such markings.

The reflective-mix is cement based material having binding properties that would enhance the adhesion to concrete surfaces.

Advantages of Reflective-mix for markings concrete surfaces
1 Easy to apply
2 Skid resistance superior to that of thermoplastic or paint markings
3 Good adhesion
4 Prolong life-span of markings ( wear resistance in comparison to existing markings)
5 Minimal maintenance (washing of surface dirt to retain its effectiveness)
6 Cost effective
7 Environmentally friendly
8 Clear visibility in all weather conditions

Disadvantages of reflective-mix markings
1 Longer curing-time (approx. 3 to 4 hours)
2 Specialised equipment for application is required

The benefits of using the reflective-mix outweigh its disadvantages. As new and improved methods are sought to keep up with the rapid technological developments, the use of such materials should not be overlooked.

MAINTENANCE OF REFLECTIVE MARKINGS

The major advantage accruing from the use of reflective-mix for permanent markings is that it could be cleaned to retain its effectiveness that which is not possible for any other type of markings currently used for similar applications.

Authorities concerned with the safety and maintenance of such markings are constantly placing greater emphasis on the quality and visibility of the markings. The reflective-mix could be an alternative; cost effective solution to minimise the present problems associated with the present markings applied.

Comparison of Thermoplastic and Reflective-Mix Markings (see pictures below). Note: Thermoplastic being abraded off within a week. Picture taken at the multi-storey carpark.

Note: Testimonials from APC's clients and Test Reports done by SETSCO an independent Laboratory in Singapore are available upon request.