VIEWS: 25 PAGES: 5 CATEGORY: Engineering & Energy POSTED ON: 6/25/2010
The Type 10 Portland Cement utilized for filler on this contract was supplied from the Saint-Basile, Que., plant of Ciment Qubec Inc. Combined with 2009's unpredictable weather, raw materials supply has necessitated careful management of inventories and a versatile site crew to maintain overall target production rates. The sand equivalent test indicates the relative portion of undesirable clay-like or plastic fines and dust passing the No. 4 sieve that may be present and the tight value specified here compares to typical values of 26 to 60 for fine aggregate in hot mix asphalt, with the most common being 45.
Cover Story MRDC goes the micro-surfacing route Micro-surfacing has a proven track record on the Fredericton-Moncton Highway. By Andy Bateman, Editor N ew Brunswick’s award-winning Moncton Construction Inc. division sub- Fredericton-Moncton Highway, mitted the winning tender earlier this year the MRDC, officially opened to for a major micro-surfacing project on traffic on October 23, 2001 and this 195 km the MRDC. The project extends from the long, four lane section of the TransCanada MRDC’s kilometre marker 257 to kilometre highway has been recognized internation- marker 295.7 near Fredericton, with a start ally for innovative construction methods, date of June 1, 2009. Preparatory work by techniques and materials. The innovative the MRDC prior to micro-surfacing included tradition continued this year, with a micro- crack filling, milling and paving. There was surfacing contractor achieving high produc- no rut filling on this particular project. tivity rates, despite distant raw materials and unpredictable weather. BELOW: Micro-surfacing treatments have Martin Bouvier, project manager for DJL performed very well, preserving the pavements Technologies, explains that the company’s an additional five to seven years. 10 / September-October 2009 / Aggregates & Roadbuilding New Brunswick’s award-winning Fredericton-Moncton Highway, the MRDC, has been recognized internationally for innovative construction methods, techniques and materials. Materials supply What is micro-surfacing? From Bouvier’s perspective, the micro-sur- The Miller Group, part owner of the structurally sound polished pavements. facing process itself was routine, as DJL has MRDC Operations Corporation, describes Micro-surfacing is said to provide low- considerable experience with this road treat- micro-surfacing systems as mixtures of a cost preventive maintenance treatment ment system. What has made this job unique polymer-modified cationic emulsified as- systems that retard deterioration of the is the sheer quantity of raw materials involved phalt, mineral aggregate, mineral filler, pavement, maintain or improve the func- and their distance from the job site. DJL’s water and additives that are proportioned, tional condition of roadways and extend largest micro-surfacing project to date totals mixed, and spread with a machine over a the pavement’s service life when applied over 750,000 m², including all four lanes on properly prepared surface. to suitable candidates. The placement of nearly 40 km of highway, its interchanges Micro-surfacing systems, says Miller, a micro-surfacing system on medium to with Route 7 and Route 8, and 54 000 m² on are used to restore and preserve the sur- high traffic roads offers
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