What are rheological properties of bitumen?
The rheological properties of bitumen are measured using conventional tests including softening point, viscosity (at 65 o C and 135 o C), elastic recovery (at 25 o C by using a ductilometer), storage stability (penetration point, softening point), flash point and tests after thin film oven ageing (softening point.
What affects the rheological property of bitumen?
Different concentrations of asphaltenes in the bitumen have a significant influence on the rheological bitumen properties. Increasing the content of asphaltenes results in increasing hardness and viscosity [9] and shows an influence of the sensitivity of ageing [10].
What are rheological properties of polymers?
Polymer rheological testing and analysis: Thermal stability, onset of unstable flow, and wall slip measurements. Measurement of transient extensional properties as a tool to predict/troubleshoot polymer flow behaviour in many common forming processes such as extrusion, blow moulding and injection moulding.
What is the polymer modified bitumen?
Polymer modified bitumen (PMB) is bitumen (asphalt) combined with one or more polymer materials. This modification is done with the aim of enhancing the mechanical properties of the bitumen material.
What is G * in asphalt?
Relating Dynamic Shear Modulus (G*) of Performance Grade (PG) Asphalt Binders to Nanoindentation Stiffness (E) Traditionally, asphalt binder is characterized by a dynamic shear rheometer, which applies a shear load on a bulk volume of liquid asphalt binder to determine shear modulus (G*).
Why is rheology important in polymers?
Rheology is a key characterization technique for developing materials with the desired physical properties and for controlling the manufacturing process in order to ensure product quality. Rheology is very sensitive to small changes of the material’s polymer structure – thus ideal for characterization of polymers.
What is the difference between bitumen and modified bitumen?
Ideally, modified bitumen has more adhesion than pure bitumen and lower thermal sensitivity in the range of service temperatures and sufficient viscosity at execution temperature. In addition, its sensitivity to the time of loading is low, and its strength to plastic deformation, fatigue, and cryogenic cracks is high.
What is emulsion bitumen?
Bitumen emulsions are usually two-phase systems consisting of two immiscible liquids, bitumen and water. The bitumen phase can be dispersed in the aqueous phase by mechanically shearing it in a colloid mill.