Rational range determination of key sieve pores for graded crushed stone based on shear performance

Using the flexible material shear performance tester, the shear performance of graded crushed stone was tested, the influences of variety sieve pores and their passage rates on the shear performance were analyzed. The shear strength of graded crushed stone changes as parabola trend with the passage rate increasing of the pores 4.750 mm and 0.600 mm, it waves as horizontal inverse "S" curve with the passage rate increasing of the pore 2.360 mm, it gradually increases as a whole with the passage rate increasing of the pore 0.075 mm. The result indicates that the sieve pores, including 4.750, 2.360, 0.600 and 0.075 mm, should be regarded as key sieve pores for graded crushed stone, whose maximum grain size is 31.5 mm and the index of the Taibol formula is 0.5, for the control index that the shear strength exceeds 520.5 kPa, the rational change ranges of the key sieve pores passage rates based on the shear performance are recommended, the change ranges of the rational passage rates including the sieve pores 4.750, 2.360, 0.600 and 0.075 mm are 35%~44%, 22%~37%, 10.0%~17.5% and 2.0%~7.5% respectively.