Method for detecting and evaluating compaction uniformity of inorganic stabilized granular base course of road

Abstract

The invention discloses a method for detecting and evaluating the compaction uniformity of an inorganic stabilized granular base course of a road. According to a detection point arrangement principle, the Evdi of a to-be-estimated section of the road is detected by adopting a PFWD (Portable Falling Weight Deflectometer); a detection result is subjected to statistic analysis, so as to obtain a deformation modulus average value and a variance; upper and lower confidence limits are calculated; the three-dimensional curved surface of Evd is cut; value lines of the Evd and the like are projected out; the area Sh of a qualified region and the area Sq of an overall region are calculated; a uniformity index t is calculated according to a definition; the compaction uniformity is estimated according to an evaluation standard; a judgment method of a compacted weak region of a roadbed is to define the compacted weak region of the roadbed by adopting an Evd lower confidence region of the to-be-detected section of the road; the quick aftercompaction can be carried out according to the position of the weak region.

Description

technical field [0001] The invention belongs to the technical field of road engineering material performance detection and construction quality control, and relates to a method for detection and evaluation of compaction uniformity of a road inorganic stable granular material base. Background technique [0002] In the current "Technical Rules for Construction of Highway Pavement Base Course" (JTGF20-2015), it is stipulated that the road engineering inorganic binder stabilized aggregate base (cement stabilized gravel, cement stabilized gravel, fly ash stabilized gravel and three ash stabilized gravel) The sand filling method is used for compaction quality testing, and the testing frequency is 2 points per lane per 200 meters, and the data samples obtained from 2 points per lane per 200 meters are too small to be used for the analysis and evaluation of compaction uniformity. The frequency of sample testing increases the inhomogeneity of the final compaction quality, because the...

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Problems solved by technology

[0004] (1) Time-consuming and labor-intensive, lack of real-time guidance

[0005] When the diameter of the test pit is 20cm, the average detection time is 30-35Min / point, and the detection result is used to guide the compaction, which has serious hysteresis;

[0006] (2) There are many human factors and the accuracy is not high

[0007] Human factors such as the wet condition of the standard sand, the calibration accuracy, the shape of the compaction test pit and the method of water content measurement have a great influence on the compaction test results, and it is difficult to guarantee objectivity

[0008] (3) Destructive testing, small evaluation range

[0010] Therefore, it is impossible to obtain high-density data samples and use the test data obtained by this method to evaluate the uniformity of compaction of the base layer by using the sand filling method to detect the compaction status of the non-polar stable granular material base.

At the same time, the road industry has not proposed a detection and evaluation method for the uniformity of road base compaction, let alone an evaluation index for uniformity. The road base only uses 6-10 points per kilometer to evaluate the construction quality, and there is a small sample of data Unfortunately to evaluate the overall construction quality

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