板角强化支撑对水泥混凝土道面耐疲劳性能影响的试验研究OA

To mitigate cracking at the slab corners of airport cement concrete pavements and enhance their fa-tigue life,a variable-stiffness base construction method based on localized reinforcement support at slab cor-ners was proposed.This method involved the pre-placement of plain concrete precast discs at the slab corners during base construction,followed by the monolithic pouring of a cement-stabilized crushed stone base with 5%cement mass fraction to form a stiffness-transition support system.Accelerated loading tests on scaled in-door models were conducted to compare and analyze the structural responses of the pavement under three con-ditions:slab corner void,reinforced sections,and unreinforced sections(control).The results indicate that the peak tensile strain at the bottom of the reinforced slab corners was reduced by 43.94%to 84.80%com-pared to the unreinforced areas.Moreover,with an increasing number of load cycles,the strain growth trend in the reinforced areas remained more stable.The vertical displacement at the top of the slab was also signifi-cantly reduced in the reinforced regions,demonstrating improved resistance to deformation.In the fatigue tests,cracking occurred at 292 302 load cycles in the voided areas and at 413 642 cycles in the unreinforced ar-eas,whereas no cracking was observed in the reinforced areas even after 502 124 load cycles.These findings confirm that the variable-stiffness base method effectively improves the mechanical state at the slab corners,delays the accumulation of fatigue damage,and significantly extends the service life of the pavement structure.