What is Mscr test?

The MSCR test uses the well- established creep and recovery test concept to evaluate the binder’s potential for permanent deformation. Using the Dynamic Shear Rheometer (DSR), the same piece of equipment used today in the existing PG specification, a one-second creep load is applied to the asphalt binder sample.

What is Jnr in MSCR?

In the MSCR specification the grade of binder is changed based on the non-recoverable compliance (Jnr) value as opposed to testing at different temperatures. If the grade is a PG 64 or PG 58 you would do all high-temperature testing at 64°C or 58°C.

What is non-recoverable creep compliance?

The non-recoverable creep compliance measured at 3.2 kPa is used as a measure of the resistance of an asphalt binder to permanent deformation under repeated loading condition. The percent recovery is employed to identify the presence of elastic response and stress dependence of tested asphalt binders.

What does DSR measure?

The DSR measures a specimen’s complex shear modulus (G*) and phase angle (δ). The complex shear modulus (G*) can be considered the sample’s total resistance to deformation when repeatedly sheared, while the phase angle (δ), is the lag between the applied shear stress and the resulting shear strain (Figure 5).

What is phase angle bitumen?

The phase angle, d , (related to the time lag between input and output signals) provides a relative indication of the viscous and elastic behavior of the asphalt binder. Materials with a phase angle of 90 degrees are completely viscous; while materials with a phase angle of 0 degrees are completely elastic.

What is the measure of DSR?

What is the purpose of DSR?

The aim of a DSR is to allow business users to identify which products are selling, how often and where — even if these users don’t have technical knowledge. Organizations can use DSR systems to improve their supply chains and become more responsive to market trends and customer needs.

What are the parameters to check the rheology 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 is G * in asphalt?

The complex shear modulus (G*) can be considered the sample’s total resistance to deformation when repeatedly sheared, while the phase angle (δ), is the lag between the applied shear stress and the resulting shear strain (Figure 5). The larger the phase angle (δ), the more viscous the material.

What is the density of HMA?

The density of the compacted mix is its unit weight, or the weight of a specific volume of mix. For compacted HMA, this is approximately 145 pounds per cubic foot. Density is particularly important because high density of the finished pavement is essential for long term pavement performance.

What is the phase angle in asphalt?

Materials with a phase angle of 90 degrees are completely viscous; while materials with a phase angle of 0 degrees are completely elastic. At intermediate temperatures, such as 20ºC, asphalt binders are said to be viscoelastic (phase angle near 45 degrees).

What is SSR and DSR?

A number of protocols have been developed insofar to facilitate the administration, management and operation of such networks; for packet routing, in particular, two of the most widespread protocols are DSR (Dynamic Source Routing) and SSR (Signal Stability Routing).

What is Cpwd data book?

Central Public Works Department Analysis of Rates for Delhi is a very comprehensive and useful document forming basis for the rates of various items. It is based on scientific assessment of Inputs of materials, labour and machinery in various items of work normally involved in civil construction projects.

How do you test an asphalt binder?

In testing, a container of asphalt cement is heated to the standard test temperature, 25 o C, in a temperature controlled water bath. A needle is allowed to bear on the surface of the asphalt cement for 5 seconds.