Asphalt pavement to prevent cracking of several en

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Asphalt pavement to prevent cracking of several engineering measures

Grouting costs about 12 yuan / m, and repair of concrete pavement slab (broken, clear, reinforced primary, poured panel) the cost of 110 yuan / m. 7.5m wide pavement section with cement, plate length 4m calculation, the current void, sink. Squirt mud, dislocation, fracture plates slightly to one kilometer to 30% of the total plate count,[link widoczny dla zalogowanych], such as general conservation measures taken by the rain,[link widoczny dla zalogowanych], overloading, the role of heavy traffic and other factors, about 15% of the plate need to replace the repair, be restoration cost of about l5 million. Treatment of 30% while the cost of grouting plate just 3.5 million per kilometer of funding 115,000 yuan can be saved. Moreover, the general conservation measures taken, over time, damage the rest of the plate will continue to develop until the re-repair, but also need to invest a lot of money to repair. Grouting technique using a one-time processing can improve the grass-roots grass-roots level. 5 Conclusion urban roads Cement Concrete Pavement in the use of grouting technology, embodies the principle of conservation, \Included in the concrete pavement preventive maintenance work scope, extending the service life of concrete pavement,[link widoczny dla zalogowanych], concrete pavement to prevent the destruction of the early and middle will have a positive effect. Not damaged in the concrete slab, the plate end of grouting technology is cost, fast, effective, quick opening, to avoid being cleared of broken plate waste pollution of the environment. Extend the pavement life is a valid scientific conservation techniques, with the pressure grouting technology continues to promote, will be further achieved good economic and social benefits. Received :2007-09-16 【on the next page 44) material and the products (geotextiles, geogrid, etc.) have also been without relying on imports. Some provinces have done the country a number of pilot studies, the construction of a number of pilot road. However, most of the heat resistance of geotextile problems and other problems in construction, the test road repair has not achieved satisfactory results. 3 Effects of several engineering measures and recommendations 3.1 Introduction geotextile on the role of inhibition of reflective cracking of asphalt pavement cracks due to reflection of the seriousness of damage, at home and abroad have been more in-depth research carried out,[link widoczny dla zalogowanych], especially in retarding reflection cracks appear timing effect is more significant. Application of Stress laminated to prevent and delay the dissipation of reflective cracking is to use a stronger interlayer deformation resistance and stiffness and low modulus, with its crack at improving the situation by force, dissipates stress concentration. Geotextile as a soft interlayer pavement structure can reduce the crack tip stress intensity level by hand, can indeed play a role in inhibition of reflective cracking. However, with the constant immersion and compression asphalt role of role models in floor constantly lost. As a reinforcing material, geotextile material in terms of strength and resistance to deformation, but too low, therefore, can only play a geotextile material role in retarding reflection cracks appear, usually 1-2 years retarded. 3.2 Geogrid cracks on the role of inhibitory reflex geogrid reinforcement as an alternative (for material) or a sandwich (for structural purposes) materials in the early 9o 2o century, began to introduce my country. Trying to join in the asphalt mixture to reduce the stress of geogrid, the strain level, * 46 * improve the tensile strength, and thus to reduce reflective cracking purposes. Plastic grid reinforced asphalt mixture as a material for the mixture with significantly improved low temperature performance. However, because of its poor creep resistance, especially not high temperature, the construction is extremely difficult, very difficult to guarantee the quality of paving. Therefore, not recommended as a hot asphalt mixture reinforced materials. Glass fiber grid has its own strength because of its high load level in the use of non-existent under the conditions of the problem of creep, high temperature, convenient construction, and good compatibility with asphalt, and many other advantages, is currently under a more ideal thermal cracking of asphalt mixtures to enhance the reinforcing materials. But the domestic glass fiber reinforced asphalt pavement for more types of grid, but not clear indicators of fiberglass grating, test methods and standards are not uniform. Urgent need to develop appropriate national conditions of China's product specifications, performance requirements, test method standards. 3.3 Boni Wei polyester fiber on the role of preventing cracking of asphalt pavement test results from the situation in the asphalt concrete 加入博尼维, Boni Wei in the distribution of large quantities of asphalt concrete and wrapped with uniform mesh, to increase the stiffness of asphalt concrete. Asphalt concrete can improve the thermal stability and low temperature crack resistance, can improve the flexibility of asphalt concrete, elastic, water stability and spalling resistance, stability and durability are significantly improved, you can extend the service life of asphalt pavement; on asphalt pavement cracks, loose, flaking, etc. have a preventive effect, but its larger input costs can be Thin layer,[link widoczny dla zalogowanych], the slope surface, road reinforcement and high standards of road have special requirements for the use of the surface layer. Received date :2007 -07-29

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