The strength of the pavement structure and pavement layers is characterized by a number in engineering is called as the Structural Number (SN). It is a number that says about a pavement’s required structural strength. This online flexible pavement design structural number calculator helps you to calculate the indexing number called SN which is necessary for pavement design.
Calculate the flexible pavement structural number given that,
a1=Layer coefficient for asphalt = 8
ta=Asphalt layer thickness = 8
b1=Layer coefficient of base = 7
tb=Base layer thickness = 7
c1=Layer coefficient of sub-base = 5
tsb=Sub-base layer thickness = 6
d1=Layer coefficient of additional layer = 9
tad=Thickness of additional layer = 4
Flexible Pavement Structural Number (L) = 8 x 8 + 7 x 7 + 5 x 6 + 9 x 4
= 64 + 49 + 30 + 36
= 179