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Behaviour of bitumen - .PDF file.

bitumen-01

Bitumen is obtained from high-temperature distillation. It is a mixture of various different petrochemical molecules connected in a physico-chemical network of forces. At low temperatures beneath the melting temperature these complex super-structures are rigid like a solid. Due to the so-called steric hardening, bitumen becomes inflexible and brittle.

When bitumen is rheologically characterised in the temperature range of T=0°C up to +70°C, the sample’s state changes under these conditions. With increasing temperature the mixture becomes softer.

When continuing the supply of thermal energy, the super-structures are increasingly decomposed. Thus the bitumen mass becomes more and more flexible. Under the given shear stress it is easier than for the various small oil- and wax-like molecules and the resinous long-chained coils of macromolecules to slide off one another. However, the polymer chains usually are enclosed by interactions into the discrete, insoluble micelles or microparticles of the asphaltenes.

Eventually a solid-like, rigid body becomes a free-flowing melt.

The rheological behavior of the natural product bitumen can specifically be influenced by adding synthetic polymers. Brittle natural bitumen can be made more impact resistant by adding polymers.

Download the application report to discover the results of the experiment on the melting behaviour of a polymer modified bitumen.

Behaviour of bitumen

Anton Paar Ltd

Anton Paar develops, produces and distributes highly accurate laboratory instruments and process measuring systems, and provides custom-tailored automation and robotic solutions.

Anton Paar develops, produces and distributes highly accurate laboratory instruments and process measuring systems, and provides custom-tailored automation and robotic solutions.

It is the world leader in the measurement of density, concentration and CO2 and in the field of Rheometry. Other areas of specialty are: Viscometry, Polarimetry, Refractometry, Microwave Sample Preparation & Synthesis, Chemical and Mechanical Surface and Nanostructure Analysis.

With over 2200 employees at the headquarters in Graz (Austria) and the 25 sales subsidiaries worldwide, Anton Paar ensure that their products live up to their excellent reputation. The core competence of the company – high-precision production – and close contact to the scientific community form the basis for the quality of Anton Paar’s instruments.

A strong sales network in more than 110 countries guarantees customers rapid support and answers to their application and service queries.

Innovation is the basis for progress and every year Anton Paar invests more than 20 percent of the annual turnover in R&D.

Anton Paar Limited, a subsidiary of Anton Paar GmbH, provides sales, application support and service to users across the UK and Ireland.

With an office in St Albans (UK) and Dublin (Ireland) and a team of over 30 dedicated employees, Anton Paar Limited aims to provide first-class service at every stage in the customer relationship, ensuring our products live up to their excellent reputation.

Anton Paar Ltd
Unit F, The Courtyard
St Albans
AL4 0LA
UK

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