Substitution of Cement by Micro-Milled Recycled Concrete in Cold Recycled Asphalt Mixes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F16%3A00300623" target="_blank" >RIV/68407700:21110/16:00300623 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Substitution of Cement by Micro-Milled Recycled Concrete in Cold Recycled Asphalt Mixes

Popis výsledku v původním jazyce

The cold recycling technology is with no doubt the most environmental friendly way of pavement construction and reconstruction. Not only that the energetically demanding process of asphalt heating is eliminated, but also 100 % of the mix aggregate can be formed with the material milled from the same or another old asphalt pavement, which would otherwise be landfilled. Use of this technology has been evolving over last decades, which is confirmed for example by its application to the base layer of 180 kilometers of a main Czech motorway D1, which is currently being reconstructed. On the other hand, problems with an unsuitable application of the cold recycling technology still occur, as well as there are still options of economic and environmental aspects improvement. Besides the bituminous binder (foamed bitumen or bituminous emulsion) cement is often added into the cold recycled mixes as well. That is because cement improves moisture susceptibility and provides sufficient strength and stiffness especially during the early stage of mix curing. This article is focused on investigation of the potential of cement substitution by the micro-milled recycled concrete. The waste concrete is simply milled by a high speed mill which causes its mechanical activation. The results of performed measurements show a very positive influence of the micro-milled concrete on moisture susceptibility in the first place. The impact on the strength and stiffness is lower than the influence of cement, however all tested mixes met the requirements for cold recycled mixes with a huge reserve. Besides that, thanks to a slower initial strength increase, the problem with hydraulic cracks origin typical for mixes with cement is eliminated.

Název v anglickém jazyce

Substitution of Cement by Micro-Milled Recycled Concrete in Cold Recycled Asphalt Mixes

Popis výsledku anglicky

The cold recycling technology is with no doubt the most environmental friendly way of pavement construction and reconstruction. Not only that the energetically demanding process of asphalt heating is eliminated, but also 100 % of the mix aggregate can be formed with the material milled from the same or another old asphalt pavement, which would otherwise be landfilled. Use of this technology has been evolving over last decades, which is confirmed for example by its application to the base layer of 180 kilometers of a main Czech motorway D1, which is currently being reconstructed. On the other hand, problems with an unsuitable application of the cold recycling technology still occur, as well as there are still options of economic and environmental aspects improvement. Besides the bituminous binder (foamed bitumen or bituminous emulsion) cement is often added into the cold recycled mixes as well. That is because cement improves moisture susceptibility and provides sufficient strength and stiffness especially during the early stage of mix curing. This article is focused on investigation of the potential of cement substitution by the micro-milled recycled concrete. The waste concrete is simply milled by a high speed mill which causes its mechanical activation. The results of performed measurements show a very positive influence of the micro-milled concrete on moisture susceptibility in the first place. The impact on the strength and stiffness is lower than the influence of cement, however all tested mixes met the requirements for cold recycled mixes with a huge reserve. Besides that, thanks to a slower initial strength increase, the problem with hydraulic cracks origin typical for mixes with cement is eliminated.

Druh

D - Stať ve sborníku

CEP obor

JM - Inženýrské stavitelství

OECD FORD obor

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Projekt

<a href="/cs/project/TA04031256" target="_blank" >TA04031256: Rozvoj mechanicky aktivovaných materiálů na bázi recyklovaného betonu pro progresivní stabilizované a za studena recyklované konstrukční vrstvy</a><br>

Návaznosti

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

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název statě ve sborníku

TOP 2016

ISBN

978-80-227-4568-0

ISSN

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e-ISSN

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Počet stran výsledku

8

Strana od-do

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Název nakladatele

Slovenská technická univerzita, Strojnícka fakulta

Místo vydání

Bratislava

Místo konání akce

Častá - Papiernička

Datum konání akce

7. 6. 2016

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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