Volume 21, Issue 2 (March 1993)
Flow and Stability Limits for Six-Inch-Diameter Marshall Specimens
Finite element analyses were conducted to determine appropriate specifications for limits on flow and stability of 6-in. (152.4-mm) diameter specimens in the Marshall procedure for mix design of bituminous concrete. Loads and deformations on 6-in.-diameter specimens were determined that result in a state of stress similar to that in 4-in. (101.6-mm) diameter specimens at initiation of yield. From these results, dimensionless scaling factors were determined by which stability and flow specifications for 4-in.-diameter specimens can be multiplied to determine appropriate limits for 6-in.-diameter specimens. These analyses provide a more rational basis for evaluation of stresses and deformations that occur in the Marshall test than has been provided previously. The results yielded scaling factors of 1.50 for flow and 2.25 for stability, which verify the results of experimental results reported in the literature.