By four-point bending test and fatigue test

the authors studied the flexural toughness and fatigue property of semi-rigid base course of cement-stabilized macadam with and without polypropylene(PP) fiber.Some significant data about these two kinds of material have been obtained

such as the load-deflection curves

toughness index according to the standard methods of JCI and ASTM C1018-97

the fatigue lifetime under different stress levels and the fatigue lifetime regression equation.The results show that the reinforcing effect of the PP fiber is remarkable;the bending strength

ultimate deformability

JCI toughness index

ASTM C1018-97 toughness index and fatigue life of cement-stabilized macadam with PP fiber are increased by about 10%

150%

67.7%

36.1%~79.8%

and 126%~352%

respectively

when the volume fraction of PP fiber is only 0.077%.At the same time

the authors revealed the toughness improving mechanism and the anti-fatigue mechanism of the fiber in such material based on the fracture mechanics theory.