Which test is performed on bitumen emulsion to assess the efficiency of spraying nand jet?

Option 2 : viscosity test

Explanation:

Viscosity Test:

(i) Viscosity denotes the fluid property of bituminous material and it is a measure of resistance to flow. At the application temperature, this characteristic greatly influences the strength of the resulting paving mixes.

(ii) Low or high viscosity during compaction or mixing has been observed to result in lower stability values.

(iii) At high viscosity, it resists the compactive effort, and thereby resulting mix is heterogeneous, hence low stability values.

Settlement test: 

• Settlement (storage stability) tests generally involve storing the emulsion in a cylinder, then comparing the solids content of the upper and lower layers after 1–5 days.
• The rate of settlement depends on the difference in densities, the size of particles, the binder content, and the viscosity of the water phase.

Demulsibility test:

• The deductibility test indicates the relative rate at which the colloidal asphalt globules in the rapid setting asphalt emulsion will break when spread in thin films on soil or ag- gregate. Calcium chloride causes the minute asphalt globules present in the anionic asphalt emulsion to coalesce.