Posted by Chris Sullivan on Wednesday, 26 July 2017 at 12:10:44
Filed under: General
The Standards Advisory Group has been established to assist CIHT to co-ordinate and promote the activities of the Institution in relation to standards advice for materials and pavement design for highways, airfields and industrial purposes. Members of the group sit on a number of British Standards Institution (BSI) Committees developing standards for the industry.
CIHT are seeking to establish a core group of members who are interested in receiving alerts and/or assisting the Institution in our relationship with BSI and developing standards. If you would like to be involved please contact firstname.lastname@example.org
BSI has also recently launched a public online system where new work proposals are accessible for wider view and comment. This is designed to increase awareness of the Standards Development Portfolio. CIHT members may wish to put forward comments through the CIHT and its representatives or simply as a member of the public.
Submit your project proposals
Do you have an idea for a new transport infrastructure scheme that you think would make a big difference, either to local communities or the prosperity of the nation? Why not share it with Transportation Professional magazine? Email your suggestions to email@example.com
CIHT member wins Wolfson prize
Well done to CIHT graduate member, Gergely Raccuja, who works for Amey as a transport planner, on winning the £250,000 Wolfson Economics Prize. Gergely beat four other finalists in the competition to find ways of paying for better, safer and more reliable roads. Read more here.
CIHT Foundation prize awarded
Congratulations to Max Harwood, recent winner of Newcastle University’s CIHT Foundation Prize. Max received the prize as the top undergraduate Transport Option Engineering student at the university this year. Max was presented with the prize at his graduation ceremony last week by North East & Cumbria Chair Darran Kitchener. If you would like more information about the CIHT Foundation click here.
Have your management skills recognised
CIHT has partnered with the Chartered Management Institute (CMI) to offer a streamlined route to qualify as a Chartered Manager (CMgr). The partnership means that CIHT members who hold CEng, IEng, or TPP registration with five years or more of management experience are eligible for CMI’s qualified route to becoming a Chartered Manager. Eligible CIHT members receive a 50% discount on the CMI membership fee. To find out more information click here.
Interim registration is available to those who have obtained the academic base for either IEng or CEng, but do not yet possess the relevant practical experience to meet the competency requirements for full registration. Having interim registration will demonstrate to employers your enthusiasm, drive and commitment to both your career and the profession. For more information, click here.
Tags: ciht, standards, advisory, group
Posted by Chris Sullivan on Friday, 06 June 2014 at 14:58:59
Filed under: Products, Case Studies
Bob Noakes of Norfolk County Council, Howard Cooke of Asphalt Reinforcement Services and Chris Sullivan of Material Edge visited a variety of sites to see the Dutch experience of the long term performance of GridSeal®.
GridSeal® is a composite reinforcing system developed by Ooms Avenhorn Holding bv, consisting of GlasGrid® glassfibre reinforcement mesh and a hot sprayed Sam-C® membrane of SBS polymer modified bitumen. Depending on the circumstances GlasGrid® is covered with 1.0 to 2.5kg/sq.m of hot sprayed Sealoflex®-SC 4 and then treated with approximately 7kg/sq.m. of clean crushed aggregate.
Modelling loading on peat roads
Benefits of Gridseal®
GridSeal® provides improved protection against reflective cracking; excellent and durable visco elastic bond between the existing pavement and the new overlay; durable and tough anchorage of the reinforcement giving increased performance; superior interlock; durable waterproofing of the underlying pavement structure.
The first site visit was to the N99, in the area of Den Helder a 50 years old concrete road overlaid with GridSeal® and Sealoflex® asphalt in 1993. The pavement structure is 18 cm concrete, Sealoflex asphalt levelling course, GridSeal consisting of GlasGrid 8501 and 2.5 kg/m2 Sealoflex®-SC 4, 4 cm dense asphalt concrete and 5 cm porous asphalt.
This site was like many others in The Netherlands boarded on 2 sides by water. On the north side the road runs parallel with a cycle path which is next to a 4metre high dyke behind which is the North Sea. On the south side the road forms the embankment and 1metre below is polder land with irrigation and drainage channels. The road structure therefore is surrounded by and founded on water.
The GridSeal® was chosen in this location for its ability to prevent reflective cracking from settlement cracking which occurs in the pavement structure as a result of swelling and shrinkage during winter and summer conditions. The combination of GlasGrid® reinforcement for strength and Sealoflex® SC 4 for waterproofing has performed admirably with no obvious cracking appearing along the treated section. Sealoflex® in the surfacing layers has prevented any rutting as well as keeping the surfacing durable and crack free. The road texture is still excellent and intervention through overlay has not been necessary during the 12 year life. The pavement looked as if it would last another 12 years without maintenance being required.
On the following day the group visited Mr. Nills Strijbos of Hoogheemraadschap Hollands Noorderkwartier in the area of Amsterdam where he together with Ruud Talsma of Ooms Construction bv showed on their area maps the variety and scope of sites now using Gridseal® for more than 10 years. Mr. Strijbos explained that all of the fully flexible highways in his area which are subject to settlements due to water movement have in the past been heavily patched every 2-5 years. However where GridSeal® is used lifetimes of 8 to 10 years plus are common. All new sites which are in areas subject to settlement are now provided with GridSeal® treatment to prevent premature failure.
There then followed a series of site visits including to one site where GlasGrid® reinforcement alone had been used in the early days and which was showing earlier signs of deterioration than the GridSeal® combination sites.
In addition some failed sites were visited to show the type of failure that occurred where GridSeal® is not used. These failures were similar to many of the peat and fen road sites seen in the UK and Ireland which was of particular interest to Bob Noakes for the areas of England around Norfolk and Suffolk where there are many similar problems encountered.
One particular site where trees were along one side on a small embankment which dropped into drainage channels there were signs of cracking. This was thought to be due to the excessive water demands of the trees and patching using GridSeal® had been performed in those areas with great success.
All told the history of use of GridSeal® was one of success and Mr. Strijbos intended to use the system for a long time to come.
Tags: gridseal, dutch