Study On The Surface Functions For Grooved Concrete Pavement

Groove is a important measure to improve the skid resistance for cement concrete pavement. However, grooving pavement has some fault such as excessive noise and road surface texture of insufficient durability which become a obstacle of promotion and application cement concrete pavement in the world. In order to play the advantages of concrete pavement, the design concept of cement concrete pavement is changing from a single strength design to emphasize road surface functional design. Relying on the Western Region Transport Development Science and Technology Program-Surface Function of Cement Concrete Pavement, the surface characteristics such as skidding resistance, noise and wearing resistance were researched based on the extensive collection and analysis of concrete pavement surfaces at home and abroad.Based on the analysis of interaction mechanism between tire and pavement, the contact model between vertical and horizontal grooving concrete pavement with different groove parameters and tire rubber block was established by the application of finite element software ABAQUS. The effect of groove width, groove spacing on longitudinal and transverse friction for the concrete pavement was analyzed, which provided a reasonable theoretical basis for the road surface friction mechanism analysis and concrete groove parameters selection.According to the fluid dynamics theory,3D finite volume model of tire hydroplaning on the concrete pavement was established. The3D finite volume model of tire hydroplaning was checked by the experimental data in the NASA experiment. Based on this, the hydrodynamic pressure at the bottom of tire was calculated, and the relation curve between velocity and pressure was drafted when the car is running at the different speed on the concrete pavement with different parameters. The effect of pavement parameters on the tire hydroplaning was researched by the changing the grooving parameters. Take the grooving parameters as factor, the model of the hydrodynamic pressure at the bottom of tire was established at the different speed.The coast-by noise tests was introduced and the tire-falling method in the door was established. At the same time, the implementation details about the test methods were developed. The noise of four horizontal groove concrete pavements in suburbs of Xi’an was measured by the method of coast-by. The relationship between sound pressure and velocity was established. The noise level of longitudinal and transverse groove, smooth, and porous concrete pavement was measured by the tire-falling method. And the reason of4concrete pavement was analyzed. Based on this, the influence of groove parameters on the longitudinal and transverse grooving pavement was analyzed by the gray correlation analysis.The accelerated wearing test equipment and test plate of texture depth was developed for grooving concrete pavement. Take longitudinal and transverse groove pavement with depth, width, spacing as factors, the orthogonal experiment was designed. The texture depth was measured in the different time. The result of orthogonal experiment was analyzed by the analysis method such as visual, range and variance. On this basis, the important effect factor for attenuation of texture depth and association of grooving was determined for grooving concrete pavement. The pendulum value of grooving pavement was measured at the process of wearing. Based on this, the attenuation model of pendulum value in wear process was established using GM(1,1) model. It is helpful for grooving concrete pavement to preservation of skidding resistance.Take into account water-cement ratio, the cement content, the maximum particle-size of aggregate, sand ratio, orthogonal experiment with the evaluation index was done such as compressive strength, flexural strength, slump, wear loss. And the experiments results were analyzed by the method of fuzzy. Taking the value of fuzzy comprehensive evaluation as the target function, mix design of wearable concrete was optimized based on the multiple target membership function of strength, workability and wear resistance. Finally, the influence of mineral admixture on the wear resistance of concrete pavement was researched. And the measure of wearing improvement was proposed.The surface function evaluation system was established including skid resistance, noise, and wear resistance. The weight of each index was calculated by the method of entropy weighting. And the evaluation model was developed based on the entropy weighting and Topsis. Finally, the surface function with common groove parameters was evaluated for longitudinal and transverse grooving pavement. Based on this, the best groove parameters was recommended.