Materials

*Bitumen from recycled asphalt can be rejuvenated using additives, according to Iterchimica The use of reclaimed asphalt pavement (RAP) is common in many countries. However, the aged bitumen from RAP has a lower penetration and is more viscous than when first mixed. This reclaimed bitumen is generally balanced by the addition of fresh binder that is softer than those typically used to produce hot mixes. But balancing penetration and softening point or viscosity will not deliver bitumen identical to the orig

Italian firm MB has supplied crushing and screening buckets for use in Brazil, with the units carrying out important demolition and sorting work for the 2014 World Cup. Through a partnership with Grupo Monte Sinai Locação, the MB units have used for the construction of the Arena Pernambuco stadium ahead of the 2014 Brazilian World Cup. The first BF90.3 was purchased by the firm in May 2011 and was used for recycling demolished material at the Atlantico Sul shipyard in the Port of Suape (Pernambuco).

An SF-3000 machine from Power Pavers has been carrying out a paving job on Highway 218 to the north of Waterloo in the US state of Iowa. The SF-3000 machine forms part of a paving train on the project, which involved replacing and widening a section of the roadway and building new on/off ramps. The two-lane roadway has been paved to a thickness of 356mm and was paved over dowel baskets, while a key-way inserter with tie-bars was used. The job has also required the use of a Power Pavers PS-2700 placer/spread

Empty environmental commitments from governments, falling bitumen quality and the impact of the economic crisis - DenimoTech asked some of its global distributors about the challenges of today’s markets - Kristina Smith was there to listen in Competition from Chinese manufacturers; highways abandoned half-built; the worst year for road building in the last 20 years. These are challenging times for DenimoTech’s distributors whose goal is to sell the firm’s bitumen emulsion and polymer modified bitumen plants

Warm mix asphalt can save energy and the environment, cutting emissions of carbon dioxide and other harmful gases, but are environmental arguments enough for clients and contractors? Kristina Smith asks Though popular in the United States, warm mix asphalt is still a technology waiting to happen in the rest of the world. Chemical companies who imagined a meteoric rise in sales are still waiting for the right economic conditions to allow warm mix to start taking serious market share from hot mix. “In Europe

Novel crushing and screening developments are coming to market - Mike Woof reports A wide array of innovations and market developments are occurring in the sector for quarrying machinery. New technologies are being introduced while business developments are also changing the face of this market segment. There is strong interest in new technology from industry too and this was well highlighted by data from the organisers of the Hillhead quarry show in the UK. The organisers revealed that there was a jump of

The use of reclaimed asphalt pavement (RAP) is common practice in many countries. The aged bitumen from RAP has a lower penetration and is more viscous than it was when first mixed. The reclaimed bitumen is generally balanced by the addition of fresh binder softer than the traditional one used to produce hot mixes. However, balancing penetration and softening point or viscosity does not produce an identical bitumen to the original one. One fundamental option is the regeneration of the aged binder in order t