Externally funded project

Werksgemischte Kaltbauweisen Asphalt


Project Details
Project duration: 03/201609/2016


Abstract

The
production process of hot-mix asphalt and here especially the energy demand for
drying and heating of the aggregates, inhibits the main proportion of the
overall life-cycle associated impacs (e .g. emissions of greenhouse gases) in
the production of flexible pavements. Therefore, alternative technologies for
paving are required in long-term. Internationally, feasible experiences were
gained with cold bituminous mixtures on basis of bituminous emulsion and foamed
bitumen. However the resulting mixtures inhibit considerable differences to
hot-mix asphalt and therefore demand for specific procedures for mix design and
pavement design.

In order to
estimate the applicability of these materials in Germany, the international
literature as well as several national specification documents were assessed
and compared. Regarding the applied binder and binder contents different type
of cold bituminous mixtures can be distinguished: Cold asphalt, Grave emulsion,
bitumen stabilized materials, bitumen-cement-stabilized materials and cold
mixtures for sealing hazardous reclaimed pavement material. The mechanical
property of these materials differ considerable from the properties of hot-mix
asphalt. The presence of water during mixing, laying and compaction results in high
void content and a long-lasting curing process of several months within the
material gains strength and stiffness. The internationally applied mix design
procedures are based on mechanical tests of strength and stiffness as well as
water sensibility which demands for suitable laboratory compaction and curing
procedures.





However,
the practical applicability in various climatic regions throughout Europe
indicates the general applicability of these materials in Germany. 



Principal Investigator

Last updated on 2019-08-03 at 16:08