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ePaper created 2015-04-22, 14:48:24 | version 1.37.0
Issue One 2015 27 You will find more information on www.strabag.de temperatures during the entire transport route and, from 2016 on, they must docu- ment them as well. The required values have been specified in the ZTV, the additional contract terms for technical installations, which are mandatory for all construction projects in Germany – during transport, as well as other processes, such as rolling. For example, the rolling pattern depends on ma- terials used, layer thickness, and the narrow temperature ranges specified in the ZTV. Implementing the BMVI's recent trans- port guideline changes, however, has so far been a very difficult undertaking. The ministry does specify at which points the temperature is to be measured, but under real-life conditions, the requirements are often too imprecise. For example, last Sep- tember, the Federal Association of Road Haulage, Logistics, and Disposal, BGL, called the measures "unworkable in prac- tice", because they did not specify how far the sensors have to be away from the sur- rounding material or the outer hull. Minute-by-minute documentation Throughout the Strabag test, asphalt tem- peratures were documented each minute during transport, from the start at the mixing plant to incorporation into the road. To enable measurements, technicians drilled holes into the sides of the vehicle at the measurement points designated by the ministry. With the help of sensors, temperatures were then measured 5, 10, and 15 centimetres behind the load area. The technicians documented the tempera- tures both when driving, while waiting at the construction site, at different points in the asphalt paver, and finally on the road, directly behind the screed. The Strabag testers also noted down route times and environmental factors, as nothing was to be left to chance. "There are many small weaknesses which can have an effect on quality. We wanted to detect them during the test," Muschalla says. Strabag and the ministry hope that the results of the test will reveal how precise the four test systems measure tempera- tures and in which areas they still need im- provement. Additionally, the results will show how the ministry requirements are to real-life conditions. idem telematics re- ceived positive feedback for its measure- ment unit. "It was a reliable system," Muschalla says. A detailed listing will be published soon – and the industry is anx- ious to see the test results. (pb) T CONSTRUCT BY IDEM TELEMATICS The T ConStruct System by idem telematics empowers businesses to measure asphalt temperatures during transport and prior to unloading, as well as store them in digital form. The solution is based on an enhanced TControl unit with analogue sensors, an analogue/digital converter, and a display component. The user can gain access to information such as the required five tem- peratures, the average temperature, date, time, vehicle ID, and geographical position, for example, by email or smartphone. Road quality depends, amid other things, on the asphalt being hot enough during processing. Moreover, the material should not show any ups and downs in temperatures. Photo:Strabag