Skeleton Dense Gradation and Road Performance of SRX Stabilized Crushed Stone

JIANG Yingjun; ZHANG Zouyi; CHEN Zhejiang; LI Shouwei

doi:10.3969/j.issn.1007-9629.2017.02.010

Abstract：Influences of coarse aggregate gradation on its density of vibration,fine aggregate gradation on compressive strength of solution road romixsoilfix(SRX) stabilized fine aggregate,mass ratio of coarse and fine aggregates and key sieve pore passing ratio on compressive strength of SRX stabilized crushed stone based on vertical vibration compaction method(VVCM) were studied.Skeleton dense gradation of SRX stabilized crushed stone in the principle of maximum mechanical strength was put forward and its road performance was verified.The results show that density of vibration of mixture coarse aggregate reaches maximum when mass ratio of the 19-37.5 mm aggregate,9.5-19 mm aggregate,4.75-9.5 mm aggregate is 48:30 ∶ 22.Compressive strength of SRX stabilized fine aggregates reaches maximum when the decreasing coefficient(I) of fine aggregate gradation is 0.65.Compressive strength of SRX stabilized crushed stone reaches maximum when mass ratio of coarse and fine aggregates is 65 ∶ 35.Compressive strength of SRX stabilized crushed stone reaches maximum when key sieve pore passing ratios of 31.5,19,9.5,4.75,2.36,0.6,0.075 mm is 95.0％-100.0％,64.0％-71.0％,44.0％-52.0％,32.0％-40.0％,22.0％-29.0％,11.0％-18.0％ and 5.0％-11.0％,respectively.Compared with the standard gradation and cement stabilized gravel gradation,compressive strength and splitting tensile strength of SRX stabilized crushed stone at skeleton dense gradation can be increased by 13％ and 19％ or more,respectively.