"aging index" is a correct and usable phrase in written English.
It refers to a numerical value or measurement used to assess the impact of aging on a particular group or population. Example: According to the aging index, the population of Japan is rapidly aging, with a high proportion of elderly individuals compared to younger ones.
The aging index, viscoelastic behavior of aged binder recovered from the cored specimens, indirect tensile strength and residual fatigue life of the top layer and underneath layer were studied.
According to the rheological test, SBS-90 shows a larger complex modulus aging index and a smaller phase angle aging index than that of SBS-70.
That's also the thinking behind other indices out there, too, such as the Milken Institute's "Best Cities for Successful Aging" index.
Due to the UV aging, LDHs modified bitumen shows the lower softening point increment, viscosity aging index and complex modulus aging index in comparison with the unmodified bitumens, indicating their good UV aging resistance.
Each layer was studied with Fourier Transform Infrared Spectroscopy (FTIR) and an aging index is computed for comparison.
As a result of UV aging, softening point increment and viscosity aging index of bitumen were decreased by inorganic nanoparticles.
In comparison with blank sample, asphalts with thermochromic powder exhibited superior aging resistance after all of three aging patterns by rheological aging indices evaluation.
Ageing index values show that the susceptibility to oxidative ageing is significantly reduced with the increase of nano-silica content, particularly in the case of long-term ageing.
The retained penetration (RP) can be increased while viscosity aged index (VAI) and softening point increment (ΔS) get decreased after aging simulation.
An ageing index is proposed to show that the rejuvenators are affected differently by ageing.
Amount of oxygen uptake corresponds to ageing index expressed by the viscosity ratios after and before ageing.
