Functional characteristics of bitumen modified by pulverized rubber and selected chemical catalysts and/or additives

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F14%3A00232357" target="_blank" >RIV/68407700:21110/14:00232357 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Functional characteristics of bitumen modified by pulverized rubber and selected chemical catalysts and/or additives

Original language description

Until quite recently, there has been considerable interest in the use of research in crumb rubber modified bitumen (CRMB). This interest is prompted by restrictions for land-filling of old tires and their use as energy source (solid fuel) e.g. in cement production. Simultaneously, asphalt technologists expect that the use of higher content of crumb rubber in bitumen can further enhance the noise reducing potential if used in appropriate acoustic sphalt mixes. In addition, using crumb rubber as a modifier helps to narrow the wide gap between the application between conventional bitumen and polymer modified binder (PMB). At the Czech Technical University in Prague, different types of micro-pulverized rubber has been used and evaluated together with chemical catalysts suitable for temporary devulcanization of the rubber. In addition, to improve the homogeneity and storage stability of the CRMB selected additives have been tested. Traditional as well as performance-based tests were carried out on all bitumen samples. Traditional tests include ring and ball, penetration and elastic recovery tests. Performance-based tests were carried out using the dynamic shear rheometer (frequency sweeps at test temperatures ranging from 20 to 60°C. The multiple stress creep recovery test was performed at 60°C. Dynamic viscosity was also evaluated. This paper summarizes findings from these test results and made recommendations on the most suitable combinations of bitumen – CR content – catalyst and additive.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

JM - Structural engineering

OECD FORD branch

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Project

<a href="/en/project/TA02030639" target="_blank" >TA02030639: Durable acoustic asphalt pavement courses with utilization of bituminous binders modified by rubber microfiller including innovative technology of rubber milling</a><br>

Continuities

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

Publication year

2014

Confidentiality

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