Asphalt Overlaying Cement Pavement Structure with APP Modified Asphalt Felt Controlling Reflective Crack
In order to explore the mechanism and effect of atactic polypropylene (APP) modified asphalt felt preventing crack, which is used as interlayer between old cement concrete pavement and asphalt overlay, by dint of establishing finite element model, considering tensile modulus of the material, the authors calculated and analyzed the load, temperature and coupling stresses on the key dangerous points. Then, laboratory test of direct-shearing and pullout were carried out. It is indicated that the interlayer stress conditions change with tensile modulus of felt, with a perfect synthetically stress-reduced effect when the modulus reaching 1000MPa; the shearing- destruction displacement of core sample with felt interlayer comes to 7.5mm, 3.0mm more than that without the specific interlayer; the pullout-destruction force of core sample with felt interlayer arrives at 10000N, 6000N more than the other. The results show that APP modified asphalt felt is a kind of better preventing-crack materials between old cement concrete pavement and asphalt overlay, which can efficiently cut down the interlayer stresses and improve its working state.
X. F. Wang and Y. Q. Yuan, "Asphalt Overlaying Cement Pavement Structure with APP Modified Asphalt Felt Controlling Reflective Crack", Advanced Materials Research, Vols. 168-170, pp. 1218-1221, 2011