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highwaysmaintenance.com
NEWSLETTER
June 2004

TOPICS

High Specification Aggregate


Motto of the Month

Introduction
I am a bit late with this month's newsletter, but the weather has been nice and the grass, and everything else, has been growing so I have been busy in the garden.
But I have now made time for this edition because of a matter that I think you should be aware of, and if you should want to make a response you do not have a lot of time especially with the holiday period fast approaching.
I would like to think engineers and engineering technicians will be making informed responses to this document, in my opinion it is very important to have a true reflection of what is happening in the industry presented in this type of publication, as once in print things tend to become the "truth", and may misinform those who are truly "in charge".


High Specification Aggregate
A draft report, "The Sustainable Use of High Specification Aggregates in England" has very recently been published by the consultants Symonds Group Limited. 
The  Symonds Group Limited has recently been acquired by the Capita Group, and from the 1st. of June will be known as Capita Symonds Ltd..
The report was commissioned by the Office of the Deputy Prime Minister.

hot rolled asphalt surface course with a layer of high specification aggregate that will be rolled into the asphalt matrix containing a lower specification aggregate I believe this is a very important report and should be studied, and responded to, by as many practicing highways maintenance engineers and technicians as possible.
The timing of the release of the draft and the fact that comments are required by mid August will make it difficult for engineers and technicians to find the time to respond, but I hope you will make the effort. 

At this time it has only been in the "office" for a couple of days and I have only had time for a quick browse and I have found much to commend it, with a very large amount of information on the subject of high specification aggregates. 

stone mastic asphalt with a rich binder content before rolling, SMA should be designed to have all voids filled with mastic but without fatting up, all aggregate in the layer will need to be of the appropriate specification to the site conditions But already one extremely knowledgeable and experienced colleague has come up to me with extracts covered in "high-lighter" which they believe are confusing, if not to say misleading. The brief but important section in question was once again related to proprietary Thin Surfacings and their "success" with regard to durability, and I have to agree the passage does bear criticism.
The report is "freely available", if you can get hold of a copy. 

I found by putting the title in a couple of reliable search engines (5/6/04) I was unable to track down a copy on the web, although I did find reference to its commissioning on the website of the Office of the Deputy Prime Minister
The distributed report actually says it is able to be downloaded from the website of the Mineral Industry Research Organisation (Miro), www.miro.org.uk, but obviously this is a members only site because a password is needed to access it.
However you can find more information about Miro by accessing the website www.miro.co.uk , this you may find interesting.
a proprietary Thin Surfacing showing excellent texture depth but in order to attain this characteristic the matrix  is likely to be porous in nature, all aggregate in the layer will be of a high specification It is likely that if you work for a reasonable sized local authority, or consultancy, this draft report is already in your office, somewhere, ask around and see if you can obtain a copy, if you are involved in practical highways maintenance you will be interested in this report.
I hope that as many practicing highways maintenance engineers and technicians as possible will be able to gain access to this report and find the time to be able to make a reasoned and supported response to the authors.


Motto of the Month
"Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information upon it."

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