Method for nondestructively detecting asphalt pavement crack conditions

Abstract

The invention discloses a method for nondestructively detecting asphalt pavement crack conditions. The method includes steps of 1, measuring difference delta L1 of deflection values of first measuredpoints and second measured points by the aid of falling weight deflectometers; 2, shifting corresponding load application points to the other side of each crack and measuring difference delta L2 of deflection values of third measured points and fourth measured points by the aid of the falling weight deflectometers; 3, judging the asphalt pavement crack conditions according to an equation of deltaL=delta L2-delta L1. The distance from each load application point to the corresponding crack is a preset distance constant value, each load application point, the corresponding first measured point and the corresponding second measured point are positioned on the same side of the corresponding crack, and the distance from each load application point to the corresponding crack, the distance from the corresponding first measured point to the corresponding crack and the distance from the corresponding second measured point to the corresponding crack are sequentially enlarged. The locations of the third measured points / the fourth measured points relative to the load application points are identical to the locations of the first measured points / the second measured points at the step 1 relativeto the load application points, and the cracks are positioned on the center lines between the third measured points and the fourth measured points. The method has the advantages that the asphalt pavement crack conditions can be nondestructively detected by the aid of the method so as to be accurately evaluated; the method is easy and convenient to operate and extremely low in implementation cost.

Description

technical field [0001] The invention relates to a non-destructive detection method for the crack condition of asphalt pavement, which belongs to the technical field of detection of asphalt pavement defects. Background technique [0002] Cracks are one of the most typical diseases of asphalt pavement. Asphalt pavement is a layered system structure, the visible cracks on the pavement surface may only occur in the asphalt concrete surface layer, or may occur in the asphalt concrete surface layer and semi-rigid base layer, and may also occur in the asphalt concrete surface layer, On the semi-rigid base and subgrade, it is obvious that the different conditions of pavement cracking and cracking are closely related to the maintenance and repair plan of cracks. At present, in order to grasp the cracking status of asphalt pavement cracks, especially the depth of cracks extending downward, the commonly used method is core sampling, a damage detection method, that is, cores are taken ...

AI Technical Summary

Problems solved by technology

At present, in order to grasp the cracking status of asphalt pavement cracks, especially the depth of cracks extending downward, the commonly used method is core sampling, a damage detection method, that is, cores are taken across the cracks, and the status of the cracks is judged by the core samples. Pavement crack condition, although this method is intuitive, it is a destructive detection method; in addition, for deeper cracks, core samples may not be taken out completely

Some studies have also proposed the use of ground-penetrating radar technology to detect pavement cracks. This technology can theoretically achieve non-destructive testing, but the equipment is expensive and the accuracy is low.

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