Road note 39 6th edition

Also included are details have been introduced into this edition of the Road of preparatory work with consideration of the necessary Note. Details of the parameters used and the maximum sizes.

These are applicable even for single method employed to design a suitable surface dressing fractions as used for surface dressings. Also included are Section 5. Although this Design Guide is not a contract and should not Therefore, they have been removed from this edition, be used as such, it may be used to support such a contract. Throughout this edition, the 1. The Panel was drawn that can be used as a link.

However, no distinction is from organisations representing all sides of the industry, made between those that can be downloaded freely and including customers, producers and material suppliers.

The those that require payment, either for each document or organisations represented on the Panel were: as a subscription. Surface dressing, with chippings of appropriate resistance to polishing under the action of traffic, b to seal the road surface against ingress of water; will provide both microtexture and macrotexture. The design options will depend upon the pavement and assist sustainable development.

In addition, it can be used as a treatment: 2. Microtexture is the is required, surface dressing will protect the structure and texture of the aggregate with a peak to trough height of extend the period before more major, and hence costly, 0—0. If surface road, created by the distribution of the aggregate particles, dressing is left until the surface has begun to show signs with a peak to trough height of 0.

Micro- and of disintegration, the ability of a surface dressing to arrest macrotexture are illustrated in Figure 2. Microtexture cannot be measured directly, while Surface dressing will not restore the riding quality of a macrotexture can be measured by: deformed road nor will it directly strengthen the road structure.

Generally, double surface dressings There are several types of surface dressing that vary produce a marginally lower texture depth than racked-in according to the number of layers of chippings and surface dressings using the same size chippings; however, binder. The fundamental types including the high-friction it is a quieter and more robust treatment.

Single surface dressing using large coat produces a more uniform surfacing which can be chippings can sometimes be considered noisy. However, subsequently surface dressed. Inverted double surface the noise can be reduced by using types of surface dressing dressings have also been used on very hard or hard road with multiple layers of aggregate and by the use of smaller- surfacings, such as concrete, to reduce the effective size aggregate, while maintaining the requirement for hardness of the surface.

However, a racked-in surface surface texture. In seeking to optimise noise and texture, dressing is now the generally preferred option. A sandwich surface dressing is a surface dressing where a layer of chippings is spread prior to a single surface 2.

This binder ensures the long term for many situations. For use on trunk road and many local road a stable mosaic. These systems are not within the scope of this guide. The guiding principles in the assessment of sites and the design of surface dressing 3. In order to more important of which are listed in Table 3. The Table be able to routinely achieve these conditions, the surface sets out the operations in the order in which they are dressing operations in Table 3.

However, these operations are not timetable indicated in Figure 3. The application ofsurface necessarily all undertaken by the same organisation. Table 3. Advise Statutory Undertakers that any works they might foresee should be completed prior to the surface dressing being laid. Dust the surface dressing during periods of hot weather. Note any unusual occurrences during the work. No Contract Type? Figure 3. The smallest size chippings are not always available, and 4.

Surface Dressing Association, and should be referred to when surface dressing is being considered. For this reason, all chippings must be thoroughly and post-contract considerations. It is available on www. It should be noted that damp rsda-gb.

Samples of chippings to be used should be tested for compliance as deliveries are received. However, crushed gravel can be used on roads if they comply with the required 4.

The use of uncrushed gravel should be avoided. However, the attainment of the relevant PSV limit does not imply that the aggregate has suitable 5. The sizes recommended are related to the 5.

Strength is early in the season in order to ensure adequate embedment of minor importance and there are advantages in having a before the onset of cold weather. The size of chippings weaker aggregate, such as some types of slag. Because the may also be changed to assist in rationalising the different smaller aggregate in a racked-in surface dressing has less designs required on site. However, they should be used with the utmost PSV. Introduction of dust into because of the higher risk of windscreen damage.

However, secondary wetting. The sizes of the 5. Multiple number of different designs required at a site. Calcined bauxite is not 5. Good 5. Nomenclature is based on the chemical 5. For fuller explanation, reference should be made to depth is provided and to provide an extremely high initial the National Foreword of BS EN and to BS stability of the surface dressing.

BSI, a. Details of the parameters used and the method employed to design a suitable surface dressing, Application of the design. Explanation of the types of specification that can be prepared with the designs together with brief details on the application of the designs to the site, and Appendices.

Examples of the design process, supporting methods of test for the design method and information on some less common situations. The Transport Research Laboratory TRL is an internationally recognised organisation providing research, consultancy, testing and certification for all aspects of transport. Website: www. IHS Markit is a leading global source of critical information and insight for customers in a broad range of industries.

Our customer product and service solutions span four major areas of information: energy, product lifecycle management, environmental and security. By focusing on our customers first, we deliver data and expertise that enable innovative and successful decision-making. Customers range from governments and multinational companies to smaller companies and technical professionals in more than countries.

IHS has been in business since and employs more than 3, people in 35 locations around the world. Join Us! By joining you are opting in to receive e-mail. Promoting, selling, recruiting, coursework and thesis posting is forbidden. Students Click Here. Related Projects. Does anyone have any information on the useful life of a double layer crushed stone surface dressing road. It depends on what's under it! What is the double surface treatment applied to?

The only structural layer you have is the laterite base, and it being only mm thick, won't last long with the traffic you noted.

I would expect frequent re-dressing will be necessary at least monthly and rutting will likely start in the first year or two. Ron, thanks for the quick response. Not much different.