Navigation and service

HinweisCookies

This website uses cookies. These are used for intermediate storage during ordering or registration processes. Data such as frequency of use or behaviour are not recorded. Here you can find out more about data protection and possibilities for contradiction.

OK

Reduced-temperature asphalt design

Reduced-temperature asphalt is manufactured and processed at a temperature 20°C to 30°C lower than the level commonly selected at present. For reasons of compressibility and processability, manufacturing temperatures for conventional asphalt usually lie near the maximum limit stipulated by ZTV Asphalt-StB.

The photo shows asphalt installation Asphalt installation

The objective behind developing reduced-temperature asphalts was a reduction in CO2 emissions and the accompanying benefit of lower energy consumption. Moreover, the hazardous substances committee in 2000 re-defined limiting values for vapours and aerosols arising during high-temperature processing of bitumen. So far, two options of lowering asphalt temperature have been developed and successfully tested: Mineral additives and viscosity-altering organic additives.

Previous experiences with reduced-temperature asphalt were made on test routes with a laytime of several years. A conclusive evaluation of the technical properties of asphalts manufactured and processed using mineral or organic additives at reduced temperatures is only possible after a utilization period of roughly 15 years. Many of the test routes are established and monitored by the Federal Highway Research Institute.