The Application And Study Of The Glasgrid In The Reflect Crack Of Road In The Northwest Area

The reflection crack is the most grievous disease in asphalt pavement on a semi-rigid type base course in the northwest area, according to this problem, many measures have been taken to, such as the SMA, to adjust the series of material, but the effect is not so good. Now according to the climate character of the northwest area and the character of the pavement disease, we introduce the new pattern material ——GLASGRID to solve the reflection crack problem of the Northwest area. We demonstrated the effect of GLASGRID to the reflection cracks, which are produced under the temperature load in asphalt pavement on a semi-rigid type base course. In the paper, from the next three aspects to we demonstrated the argumentation: the theory analyses, the finite element account, experimentation. In the account and analyses, we take into account the temperature stress in the cases: the base course is not cracking and the base course has been cracked. According to case of the base course cracked, the stress intensity factor of crack tip has been counted. According to case of the base course not cracked, the bend experimentation, the snap experimentation, the fatigue experimentation and the compress experimentation have been done, in addition, according to the latter, the finite element analyses have been done to demonstrated the temperature stress and the prime location of the GLASGRID. To the northwest area climate, to use the GLASGRID which has the next characters: the high tensile strength, the low elongation, the high modulus of elasticity and so on, to absorb the crack of asphalt pavement on a semi-rigid typebase course is very effective.The results of the accounts and the experimentation indicate: to the test-road——Ning Xia Gu Wang express way, use the GLASGRID to the temperature stress is effective, the location of the GLASGRID is better on the tip of the base course.