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usually increases the mixtures stiffness. In cold climates, this may contribute to the occurrence of lowtemperature cracking. Another concern is due to the uncertainty of what occurs between the virgin and the RAP binder during mixing in a HMA plant. There are several types of asphalt recycling methods. Victor Gallivan, CEO, Gallivan Consulting Inc., explains that in place recycling technology is advancing all over the country. There are several types of it. Hot in-place recycling, which removes the top inch of the road, has been around
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Supply Post Western Canada Edition · supplypost.com since the 90s. Cold in-place recycling removes three to four inches of the road with a train of equipment, but it is half the cost of hot in-place and the materials are 100 percent recycled. There also are no emissions with this method. The cold central plant recycling method is identical to cold in-place. This one takes the top three to five inches off the top of the road to a plant off site where it is mixed and brought back to the site and put down. There are some additional costs, but it’s 100 percent recycled. Cold depth recycling goes the deepest, 12-14 inches down on the road, mixes it up and puts it back on the road as a new. Most states do this form of asphalt recycling. Even though the methods have been around for a while, the market is evolving with new technology. “New RAP machines have made the process easier. Ones have been used on projects in Fort Wayne, Ind., and Los Angeles, Calif., for 100 percent recycling of the asphalt,” Gallivan says. Overcoming Obstacles Mike Marshall, director
recycling products, Wirtgen America, knows about the challenges of promoting asphalt recycling. “In North America, there are three recycling methods. With traditional RAP around 25-35 percent of the asphalt that goes back on the road is recycled. In-place recycling uses 100 percent of the asphalt when the road is replaced. The constant challenge has been to take the option to the road owners, to get them to adopt the recycling option instead of traditional methods,” Marshall says. Even with road owners and contractors willing to use RAP, issues with adopting the practice occur. Marshall says the history of in-place recycling has been on less busy roads in more rural, less populated areas. The technology has grown and gotten better so it has moved to more populated areas. San Jose has done 100 miles of road with cold-in place recycling in the last three years. The equipment has evolved, which has helped the growth of the methods. “If you reconstruct a road, it’s an extensive job, its labour intensive, time consuming, and has a big
impact on the traveling public and adjacent roads. With a recycling method, you aren’t bringing in new materials, the impact on the traveling public is less, and you can have the new road ready sometimes in a day. The surrounding roads won’t get affected by materials being transported. This all leads to dollar savings. Road owners are looking at the performance of the road, will it work, and will the method save money,” Marshall says. Most contractors have a pulse on the market. Marshall says the contractors in North America are very good and they know what they have to achieve to satisfy the road owners. They have it nailed down. When contractors work with partners who can tell them what is new in the market that is very useful to them. With the goal of using RAP and asphalt recycling techniques in road projects, contractors and administrators need to come together and be on the same page. Then the road owners will be more than willing to use these methods on their streets. b Source: ConExpo
September 2017
New Piling And Drilling Rig LRB 16 From Liebherr
Liebherr presents the LRB 16, which is an allround piling and drilling rig for diverse applications within the deep foundation sector. The machine gets its name from the sledge’s travel distance, which is approximately 16 m. With a longer leader, the piling and drilling rig is also now available as a LRB 18. Special emphasis is on the compact design of the LRB 16 with an operating weight of barely 48 t, which results in low ground pressure. The robust undercarriage offers excellent stability, which can be further increased with the optional rear supports.
As a standard, the new piling and drilling rig is fitted with sophisticated control and assistance systems. Attachment recognition offers not only time recording for the respective attachment. The performance figures are also transmitted with the aid of LiDAT, Liebherr’s own data transmission system. An improvement for slurry wall application is the obstacle recognition, which enables the timely recognition of obstacles in the soil. This protects both the attachment and the basic machine. b Source: Liebherr
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