Efficient asphalt pavement technologies by combination of increased reclaimed asphalt content and warm mix solutions – effect on workability and cracking

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F18%3A00327290" target="_blank" >RIV/68407700:21110/18:00327290 - isvavai.cz</a>

Výsledek na webu

<a href="https://zenodo.org/record/1491657#.XEMF4vZFy1M" target="_blank" >https://zenodo.org/record/1491657#.XEMF4vZFy1M</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5281/zenodo.1491657" target="_blank" >10.5281/zenodo.1491657</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Efficient asphalt pavement technologies by combination of increased reclaimed asphalt content and warm mix solutions – effect on workability and cracking

Popis výsledku v původním jazyce

The ongoing discussion spanning over 20 years in Europe, along with continuous development of solutions and additives, has led to warm mix asphalts (WMA). In reality, applications lag significantly behind the progress made in the USA in last 10 years. Nevertheless, the road administrations begin to understand the potential, presented mainly by the combination of WMA concepts with an increased use of reclaimed asphalt material from rehabilitated roads. If reclaimed asphalt is treated at a lower working temperature and, moreover, additional techniques or additives are capable of improving the added value delivered by reclaimed material in new asphalt, the result is not only energy savings but also an increased contribution to circular economy at the same time. In this respect, several trial sections were defined, funded and completed in the Czech Republic with a focus on comparing different WMA solutions in combination with reclaimed asphalt contents of over 30 % for the wearing course and over 40 % for the binder course. Basic field tests were done and advanced experimental assessments were performed on asphalt mixtures for each subsection. This assessment included not only traditional test methods as required by the standards, but also more advanced functional tests, including ageing simulation and workability assessments. The paper focuses on testing and characterization of asphalt mix workability and resistance to fatigue crack propagation. Neither of the two characteristics is covered by any national or European standard and, therefore, the established practice from North America is used. Workability is determined by compacting test specimens by gyratory compactor to the selected level of target bulk density. Fatigue crack testing utilizes the same procedure as in the case of thermal crack propagation. The paper presents extensive comparisons and asphalt mix performance assessments with respect to both of the aforementioned characteristics.

Název v anglickém jazyce

Efficient asphalt pavement technologies by combination of increased reclaimed asphalt content and warm mix solutions – effect on workability and cracking

Popis výsledku anglicky

The ongoing discussion spanning over 20 years in Europe, along with continuous development of solutions and additives, has led to warm mix asphalts (WMA). In reality, applications lag significantly behind the progress made in the USA in last 10 years. Nevertheless, the road administrations begin to understand the potential, presented mainly by the combination of WMA concepts with an increased use of reclaimed asphalt material from rehabilitated roads. If reclaimed asphalt is treated at a lower working temperature and, moreover, additional techniques or additives are capable of improving the added value delivered by reclaimed material in new asphalt, the result is not only energy savings but also an increased contribution to circular economy at the same time. In this respect, several trial sections were defined, funded and completed in the Czech Republic with a focus on comparing different WMA solutions in combination with reclaimed asphalt contents of over 30 % for the wearing course and over 40 % for the binder course. Basic field tests were done and advanced experimental assessments were performed on asphalt mixtures for each subsection. This assessment included not only traditional test methods as required by the standards, but also more advanced functional tests, including ageing simulation and workability assessments. The paper focuses on testing and characterization of asphalt mix workability and resistance to fatigue crack propagation. Neither of the two characteristics is covered by any national or European standard and, therefore, the established practice from North America is used. Workability is determined by compacting test specimens by gyratory compactor to the selected level of target bulk density. Fatigue crack testing utilizes the same procedure as in the case of thermal crack propagation. The paper presents extensive comparisons and asphalt mix performance assessments with respect to both of the aforementioned characteristics.

Druh

O - Ostatní výsledky

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/TE01020168" target="_blank" >TE01020168: Centrum pro efektivní a udržitelnou dopravní infrastrukturu (CESTI)</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů