As per IRC: 29-1968, when the specimens are compacted with 50 blows on either face, the design AC mix should fulfill the following requirements of the mix.
i) Marshall stability value kg (minimum) = 340
ii) Marshall flow value, 0.25 mm units = 8 to 16
iii) Voids in total mix, Vv% =3 to 5
iv) Voids in mineral aggregates filled with bitumen, VFB% =75 to 85
The highest possible Marshall Stability values in the mix should be aimed at consistent with the other three requirements mentioned above. In case the mix designed does not fulfill any and or more of the design requirements, the gradation of the aggregates or filler content or bitumen content or combination of these are altered and the design tests are repeated till all the requirements are simultaneously fulfilled. IRC: 29-1968
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