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To solve the problems of grid preventing crack, which is used as interlayer between old cement concrete pavement and asphalt overlay, the authors carried through finite element calculations, theoretical analyses, and laboratory tests simulating the field situations. Mechanical analysis proved that grid can obviously reduce the maximum principal stress, equivalent stress, and maximum shear stress at the bottom points of the asphalt overlay. Direct shear layer tests found that the damages occur on the surface of old cement concrete near to grid, the greater the loading rate the easier is it to destroy, and it will obtain best anti-cracking results after roughed treatments. The results showed that glass fiber grid can prevent the reflection cracks from the old cement and asphalt overlay, and can improve the interlayer work, and the roughed treatment on old cement road surface is an important guarantee to achieve this objective. Introduction Glass fiber grid is a new kind of geosynthetic, with advantages of high tensile modulus and intension, high temperature resistance and corrosion resisting. In 1980's the material was firstly used by the British in asphalt pavement reinforcement and preventing crack, which obtained a better effect. With the rapid development of the old pavement modification in a wide range, the fiberglass grid is gradually used in interlayer between asphalt and old cement concrete pavement. The research shows that the special material can delay reflecting crack of asphalt overlaying structure both at home and abroad[1-3]. However, engineering application effects are not very ideal and mechanism of against the crack is in the primary stage. This paper will explore in-depth study through the theory and experiment analysis method, so as to provide scientific guidance for engineering application. Mechanism of anti-cracking Mechanical analysis. Finite element model is built to calculate stress coupled temperature and load[4,5], shown in Fig.1. From the changing trend, the maximum principal stress, equivalent stress and maximum shear stress (3 stresses) sharply reduce when the tensile modulus of fiberglass grid increases from 0 MPa to 1000 MPa. When the tensile modulus meets 500 MPa, the 3 stresses drop by 23%, 26.7% and 26.6%, respectively, than that without interlayer. When the tensile modulus reaches 1000 MPa, the 3 stresses drop by 40%, 31.9% and 38.2%, respectively, than that without interlayer. When the tensile modulus ranges from 1000 MPa to 5000 MPa, the stress curve is gradually flattened. Therefore, 1000 MPa is the best to select fiberglass grid modulus. 0662 2nd International Conference on Electronic & Mechanical Engineering and Information Technology (EMEIT-2012) Published by Atlantis Press, Paris, France. © the authors

Research on Fiberglass Grid Preventing Cracks Used as Interlayer between Old Cement Concrete Pavement and Asphalt Overlay