CN117273501A - Road asphalt surface layer crack evaluation method based on nondestructive testing technology - Google Patents
Road asphalt surface layer crack evaluation method based on nondestructive testing technology Download PDFInfo
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Abstract
The invention relates to a road surface layer evaluation index, in particular to a road asphalt surface layer crack evaluation method based on a nondestructive testing technology. The method comprises the steps of determining the size of a detected road section, and establishing various crack sizes through detection: and (3) calculating an upper surface layer crack condition index, a middle surface layer crack condition index, a lower surface layer crack condition index and an asphalt surface layer overall crack condition index in the detection road section, and evaluating the indexes according to a road asphalt surface layer crack grading evaluation table. The method is based on the road surface nondestructive testing technology, solves the problem that the existing evaluation index only evaluates the road surface morphology of the open cracks, comprehensively considers the influence of all types of cracks of the road surface on the service performance of the road surface, calculates the crack condition indexes of the upper layer, the middle layer and the lower layer respectively, calculates the overall crack condition indexes, has more representativeness, and improves the pertinence and the scientificity of maintenance and repair measures.
Description
Technical Field
The invention relates to a road surface layer evaluation index, in particular to a road asphalt surface layer crack evaluation method based on a nondestructive testing technology.
Background
In 1996 edition of Highway maintenance technical Specification (JTJ 073-96) (hereinafter referred to as 1996 edition of evaluation standard), 2007 edition of Highway technical Condition evaluation Standard (JTG H20-2007) (hereinafter referred to as 2007 edition of evaluation standard) and 2018 edition of current Highway technical Condition evaluation Standard (JTG 5210-2018) (hereinafter referred to as 2018 edition of current evaluation standard), the broken area of a crack is calculated according to the road surface form of the crack, and the road surface breakage rate (DR) is calculated together with pits, looseness, subsidence, ruts, wave congestion, oil-bleeding and repairing diseases. In the three specifications, when DR indexes are calculated, road surface cracks are divided into four types, namely transverse cracks, longitudinal cracks, cracks and blocky cracks (irregular cracks in the 1996 edition evaluation standard), each type of cracks are divided into light-heavy two-stage or light-medium-heavy three-stage according to the road surface form, and different weights are given according to the types and grades of the cracks.
When the DR value is calculated by the three-edition specification, the transverse and longitudinal cracks are metered by adopting a method of multiplying the crack length by 0.2m, which proves that the metering method basically meets engineering practice, but the weight of the transverse and longitudinal cracks is greatly improved in 2007 edition and 2018 edition of current evaluation standards, and the division standard of the weight grade is reduced. The grading standards for the blocky cracks and crazes in the three-edition specifications are basically consistent, the weight of the light and heavy blocky cracks is greatly increased only in the 2007 edition and 2018 edition of current evaluation standards, and the grading standard for the 'heavy' grade of the blocky cracks is slightly reduced in the 2018 edition of current specifications. Based on the calculated DR value, road surface damage condition index (Pavement Surface Condition Index, PCI) is calculated in equation (1) in each of the three specifications.
PCI＝100-15DR 0.412
In summary, a road surface crack evaluation method which is effective for many years in practice is formed in the specification, namely, various opening cracks are measured according to the road surface form, the DR value of the road surface damage rate is calculated, and the PCI value of the road surface damage condition index is calculated and scored on the basis. However, this evaluation method only evaluates the road surface morphology of the open crack, and cannot evaluate the propagation state of the closed crack (mainly the reflective crack which does not penetrate the surface layer) of the asphalt surface layer based on the PCI index.
Disclosure of Invention
The invention provides a road asphalt pavement crack evaluation method based on a nondestructive testing technology aiming at the problems and the shortcomings of the existing road structure evaluation indexes and methods. The indexes adopted by the evaluation method fully utilize the detailed data of the cracks obtained by the on-site nondestructive testing technology of the highway to represent the road surface state, have good positive correlation with the actual service condition, and provide accurate basis for the evaluation of the later performance decay of the road and the subsequent maintenance decision.
The invention adopts the following technical scheme:
the invention relates to a road asphalt pavement crack evaluation method based on a nondestructive testing technology, which is characterized by comprising the following steps of: the method comprises the following steps:
step 1, determining the size of a detected road section: the detected road section width is d and the detected road section length is l 0 The method comprises the steps of carrying out a first treatment on the surface of the In the detection section: the thickness of the upper asphalt surface layer, the middle asphalt surface layer and the lower asphalt surface layer are respectively recorded as h u ′，h m ′，h l ′；
Step 2, establishing various crack sizes through detection: the cracks in the detection road section are divided into transverse and longitudinal cracks, block-shaped cracks and closed cracks;
according to the detection of the upper asphalt surface layer, the middle asphalt surface layer and the lower asphalt surface layer in the step 1, the following three surface layers are obtained:
the heights of the transverse and longitudinal cracks, the block cracks and the closed cracks;
the length of the transverse and longitudinal cracks and the closed cracks;
road surface integration of block cracks and chaps;
step 3, opening the crack according to the step 2The crack rate of the upper asphalt surface layer is UCR 1 Crack rate MCR of medium asphalt surface layer 1 Lower asphalt surface layer crack rate LCR 1 ；
The upper asphalt surface layer of the block crack has a crack rate of UCR 2 Crack rate MCR of medium asphalt surface layer 2 Lower asphalt surface layer crack rate LCR 2 ；
The crack rate of the cracked upper asphalt surface layer is UCR 3 Crack rate MCR of medium asphalt surface layer 3 Lower asphalt surface layer crack rate LCR 3 ；
The upper asphalt surface layer crack rate of the closed crack is UCR 4 Crack rate MCR of medium asphalt surface layer 4 Lower asphalt surface layer crack rate LCR 4 ；
The upper asphalt pavement crack rate UCR, the middle asphalt pavement crack rate MCR, and the lower asphalt pavement crack rate LCR were calculated by:
the upper asphalt pavement crack rate UCR, the middle asphalt pavement crack rate MCR and the lower asphalt pavement crack rate LCR are obtained according to the above steps: the overall crack rate TCR of the asphalt pavement was calculated by the following formula:
step 4, calculating a layering crack evaluation index: based on the calculated upper layer crack rate UCR, middle layer crack rate MCR, lower layer crack rate LCR and asphalt layer total crack rate TCR in the step 3, carrying out calculation to obtain an upper layer crack condition index UPCI, a middle layer crack condition index MPCI, a lower layer crack condition index LPCI and an asphalt layer total crack condition index TPCI;
step 5, evaluating the classification of the lower asphalt surface layer crack state based on the upper surface layer crack state index UPCI, the layer crack state index MPCI, the surface layer crack state index LPCI and the green surface layer overall crack state index TPCI according to the following table definition:
grading evaluation table for road asphalt surface layer cracks
The invention relates to a road asphalt pavement crack evaluation method based on a nondestructive testing technology,
(1) The crack rate of the upper asphalt surface layer for obtaining the open crack is UCR 1 ：
Medium asphalt surface layer crack rate MCR 1 ：
Lower asphalt surface layer crack rate LCR 1 ：
(2) The upper asphalt surface layer crack rate of the block cracks is UCR obtained by the following method 2 ：
Medium asphalt surface layer crack rate MCR 2 ：
Lower asphalt surface layer crack rate LCR 2 ：
(3) The crack rate of the cracked upper asphalt surface layer is UCR 3 ：
Medium asphalt surface layer crack rate MCR 3 ：
Lower asphalt surface layer crack rate LCR 3 ：
(4) The upper asphalt surface layer crack rate of the closed crack is UCR 4 ：
Medium asphalt surface layer crack rate MCR 4 ；
Lower asphalt surface layer crack rate LCR 4 ：
In the above formula: transverse and longitudinal cracks h of upper asphalt surface layer ui Transverse and longitudinal cracks h of middle asphalt surface layer mi Transverse and longitudinal cracks h of lower asphalt surface layer li Block crack h of upper asphalt surface layer uj Block crack h of medium asphalt surface layer mj Block crack h of lower asphalt surface layer lj Closed crack h of upper asphalt surface layer up Closed crack h of middle asphalt surface layer mp Closed crack h of lower asphalt surface layer lp Transverse barLength of longitudinal crack, closed crack, surface integral S of block crack path j Surface integral S of crack road k Total number of transverse and longitudinal cracks N in the road section measured 1 Total number of block cracks N 2 Total number of cracks N 3 Total number of closed cracks N 4 Weight ω of severity of transverse and longitudinal cracks i (0.6 when the width is less than or equal to 3mm and 1.0 when the width is more than 3 mm), and the severity weight omega of the blocky cracks j (0.6 when the block size is more than 1m and the width is 1-2mm, 0.8 when the block size is 0.5-1m and the width is more than 2 mm), and weight omega of severity of closed crack p (0.8 is always taken without classification).
And (3) judging the evaluation result of the step (4) based on the upper layer crack condition index UPCI, the middle layer crack condition index MPCI, the lower layer crack condition index LPCI and the asphalt layer overall crack condition index TPCI combined with the road asphalt layer crack grading evaluation table in the step (5) as follows:
based on the present criteria, when any index finger of the upper layer crack condition index UPCI, the middle layer crack condition index MPCI, the lower layer crack condition index LPCI, the asphalt layer overall crack condition index TPCI is evaluated as inferior or inferior, it is determined that: repairing measures must be taken for the whole asphalt surface layer;
when the asphalt pavement general crack condition index TPCI index is evaluated as medium, it is determined that: recommending to take repairing measures for the whole asphalt surface layer;
when the asphalt pavement general crack condition index TPCI index is evaluated as good, it is determined that: repairing measures can be taken for the whole asphalt surface layer;
when the asphalt pavement general crack condition index TPCI index is evaluated to be excellent, it is determined that: the asphalt surface layer is in a service state and does not need to be repaired;
when any one of the upper layer crack condition index UPCI, the middle layer crack condition index MPCI, and the lower layer crack condition index LPCI is evaluated as middle, it is determined that: taking necessary repairing measures for the horizon and above;
when any one of the upper layer crack condition index UPCI, the middle layer crack condition index MPCI, and the lower layer crack condition index LPCI is evaluated as good, it is determined that: necessary repair measures can be taken for the horizon and above;
when the upper layer crack condition index UPCI, the middle layer crack condition index MPCI, and the lower layer crack condition index LPCI are all good, it is determined that: the service state of each layer of the asphalt surface layer is healthy and does not need to be repaired.
Advantageous effects
The invention has the advantages that the proposed evaluation index fully considers all cracks in the asphalt surface layer, can respectively carry out accurate quantitative evaluation on the upper surface layer, the middle surface layer, the lower surface layer and the surface layer on the basis of the pavement nondestructive testing result, can carry out scientific guidance on the maintenance of the asphalt surface layer according to the index evaluation result, can effectively reduce the maintenance cost of the asphalt surface layer of the road, and has certain beneficial effects on the aspects of technology, theory and application.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention more clear, the following describes the technical solution of the embodiments of the present invention clearly and completely. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
A highway site structure bearing capacity evaluation method based on actual measurement cracks and modulus specifically comprises the following steps:
(1) Determining the size of the detected road section, and the width and length of the detected road section are respectively marked as d and l 0 For a common asphalt surface layer consisting of upper, middle and lower layers, the thicknesses of the upper, middle and lower asphalt surface layers on the measured road section are respectively recorded as h u ′，h m ′，h l ′；
(2) And (3) detecting the sizes of various cracks: for detecting transverse and longitudinal cracks, block cracks and closed cracks in a road section, the average depth or average burial depth inside the road section can be detected by a Rayleigh wave detector and road surface image recognition, and the heights occupied by the transverse and longitudinal cracks, the block cracks and the closed cracks in the upper layer, the middle layer and the lower layer are dividedLet it be marked as h ui /h mi /h li ，h uj /h mj /h lj ，h up /h mp /h lp The length of the transverse and longitudinal cracks can be directly measured by a road table, the length of the closed crack can be measured by a ground penetrating radar method, and the lengths of the transverse and longitudinal cracks and the closed crack are respectively recorded as l i And l p . The areas of the block cracks and the crazes can be directly measured by a road surface, and the road surface areas of the block cracks and the crazes at all positions are respectively marked as S j And S is k . The distribution of each crack in the cracks is dense, and the Rayleigh wave detector or the ground penetrating radar is not easy to detect the crack depth, so that light/medium/heavy cracks are respectively approximately marked as upper layer/upper middle lower layer penetrating diseases according to the crack grade;
(3) And (3) calculating the layering crack rate: calculating three indexes of an Upper layer crack rate UCR, a Middle layer crack rate MCR and a lower layer crack rate LCR (Upper/Middle/Lower Surface Crack Ratio) according to the attached table 1 and the formula (2), respectively, and calculating the total crack rate TCR of the asphalt surface layer according to the thickness of the Upper layer, the Middle layer and the lower layer by weighting according to the formula (3), wherein N is as follows 1 ，N 2 ，N 3 ，N 4 The total number of transverse and longitudinal cracks, blocky cracks, cracks and closed cracks in the measured road section are respectively, and the severity of the transverse and longitudinal cracks is weighted omega i (0.6 when the width is less than or equal to 3mm and 1.0 when the width is more than 3 mm), and the severity weight omega of the blocky cracks j (0.6 when the block size is more than 1m and the width is 1-2mm, 0.8 when the block size is 0.5-1m and the width is more than 2 mm), and weight omega of severity of closed crack p (0.8 is always taken without classification).
TABLE 1 grading criteria and metering method for various cracks during UCR, MCR and LCR index calculation
(4) Calculating a layering crack evaluation index: calculating an Upper layer crack condition index UPCI, a Middle layer crack condition index MPCI, a lower layer crack condition index LPCI (Upper/Middle/Lower Pavement Surface Crack Index) and an asphalt layer overall crack condition index TPCI (Total Asphalt Pavement Surface Crack Index) from formula (4) based on the UCR, MCR, LCR, TCR (Asphalt Surface Total Crack Ratio) value calculated in step (3), wherein if a longitudinal crack caused by uneven settlement of a roadbed is propagated to an asphalt layer, both the UPCI, MPCI, LPCI and TPCI values of the evaluation road section are rated as 0 score;
(5) Based on the upper layer crack condition index UPCI, the middle layer crack condition index MPCI, the lower layer crack condition index LPCI and the asphalt layer overall crack condition index TPCI, a hierarchical evaluation of the upper, middle and lower asphalt layer crack conditions was performed according to table 2.
TABLE 2 evaluation index of road asphalt pavement crack classification
(6) When either index finger of TPCI or UPCI/MPCI/LPCI is evaluated as secondary or poor, the present standard deems that corrective action must be taken on the asphalt pavement as a whole; when the TPCI index is evaluated as medium, the standard recommends taking repair measures for the whole asphalt surface layer; when the TPCI index is evaluated as good, the standard considers that repairing measures can be adopted for the whole asphalt surface layer; when the TPCI index is evaluated to be excellent, the standard considers that the service state of the asphalt surface layer is healthy and repair is not needed. When a certain index in UPCI/MPCI/LPCI is rated as medium, the standard recommends taking necessary repair measures for the horizon and above; when one index of the three indexes is evaluated as good, the standard considers that necessary repair measures can be adopted for the horizon and above; when the three layers are excellent, the standard considers that the service state of each layer of the asphalt surface layer is healthy, and repair is not needed. When the repair suggestions obtained by the overall score conflict with those obtained by the local score, the standard considers that the maintenance repair scheme is formulated in consideration of the unfavorable condition.
Example 1
The road asphalt surface layer crack evaluation method based on the nondestructive testing technology is adopted, and comprises the following specific operations:
(1) Selecting a length l according to requirements 0 Detection section with width d=2 meters=2 meters, pre-survey design file, obtain the detected section asphalt surface layer thickness as follows: upper layer h' u =4 cm, middle layer h' m =6 cm, lower layer h' l =8 cm.
(2) The sizes of various cracks are obtained by a field nondestructive testing method such as ground penetrating radar or Rayleigh wave and the like, and are shown in the following table 1:
table 1 in-situ nondestructive testing method for obtaining various crack size tables
| Crack and crack | h u | h m | h l | l i /l p | S i /S k |
| Transverse crack 1 | 2 | 6 | 3 | 5 | |
| Longitudinal slit 1 | 0 | 6 | 2 | 5 | |
| Block crack 1 | 1 | 5 | 0 | / | 5 |
| Closed crack 1 | 2 | 2 | 0 | 5 | |
| Cracking of | / | / | / | / | 5 |
The cracks are densely distributed, and the crack depth is not easy to detect, so that light/medium/heavy cracks are approximately marked as upper layer/upper middle and lower layer penetrating diseases respectively according to the crack grade.
(3) Calculating three indexes of an upper layer crack rate UCR, a middle layer crack rate MCR and a lower layer crack rate LCR according to the attached table 2 and the following formula (1), respectively, and calculating the total crack rate TCR of the asphalt surface layer according to the thickness of the upper layer, the middle layer and the lower layer by weighting according to the following formula (2), wherein N is as follows 1 ，N 2 ，N 3 ，N 4 The total number of transverse and longitudinal cracks, blocky cracks, cracks and closed cracks in the measured road section are respectively, and the severity of the transverse and longitudinal cracks is weighted omega i (0.6 when the width is less than or equal to 3mm and 1.0 when the width is more than 3 mm), and the severity weight omega of the blocky cracks j (0.6 when the block size is more than 1m and the width is 1-2mm, 0.8 when the block size is 0.5-1m and the width is more than 2 mm), and weight omega of severity of closed crack p (0.8 is always taken without classification).
TABLE 2 grading criteria and metering methods for various cracks during UCR, MCR, LCR index calculation
The results were: ucr=0.31, mcr=0.47, lcr=0.28, lcr=0.35.
(4) Calculating an upper layer crack condition index UPCI, a middle layer crack condition index MPCI, a lower layer crack condition index LPCI and an asphalt layer overall crack condition index TPCI from the following formula (3) based on the UCR, MCR, LCR, TCR value calculated in the step (3), wherein if a longitudinal crack caused by uneven settlement of a roadbed is propagated to an asphalt layer, the UPCI, MPCI, LPCI and TPCI values of the evaluation road section are evaluated as 0 points;
the results were: upci=90.74, mpci=89.01, lpci=91.12, tpci= 90.27.
(5) Based on the upper layer crack condition index UPCI, the middle layer crack condition index MPCI, the lower layer crack condition index LPCI and the asphalt layer overall crack condition index TPCI, a hierarchical evaluation of the upper, middle and lower asphalt layer crack conditions was performed according to table 3.
TABLE 3 evaluation index of road asphalt pavement crack classification
The evaluation results are as follows: the upper layer level is "excellent"; middle layer grade "good"; the lower layer level "excellent"; the overall facing level is "excellent".
(6) According to the evaluation result, the repair suggestion given by the standard is as follows: the whole service state of the surface layer is healthy and does not need to be repaired, simple repair measures can be adopted for the surface layer and above, and according to the principle of considering the most adverse condition, the repair measures can be adopted for the surface layer and above.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (4)
1. A road asphalt surface layer crack evaluation method based on a nondestructive testing technology is characterized by comprising the following steps of: the method comprises the following steps:
step 1, determining the size of a detected road section: the detected road section width is d and the detected road section length is l 0 The method comprises the steps of carrying out a first treatment on the surface of the In the detection section: the thickness of the upper asphalt surface layer, the middle asphalt surface layer and the lower asphalt surface layer are respectively recorded as h u ′，h m ′，h l ′；
Step 2, establishing various crack sizes through detection: the cracks in the detection road section are divided into transverse and longitudinal cracks, block-shaped cracks and closed cracks;
according to the detection of the upper asphalt surface layer, the middle asphalt surface layer and the lower asphalt surface layer in the step 1, the following three surface layers are obtained:
the heights of the transverse and longitudinal cracks, the block cracks and the closed cracks;
the length of the transverse and longitudinal cracks and the closed cracks;
road surface integration of block cracks and chaps;
step 3, the crack rate of the upper asphalt surface layer of the opening crack is UCR according to the step 2 1 Crack rate MCR of medium asphalt surface layer 1 Lower asphalt surface layer crack rate LCR 1 ；
The upper asphalt surface layer of the block crack has a crack rate of UCR 2 Crack rate MCR of medium asphalt surface layer 2 Lower asphalt surface layer crack rate LCR 2 ；
The crack rate of the cracked upper asphalt surface layer is UCR 3 Crack rate MCR of medium asphalt surface layer 3 Lower asphalt surface layer crack rate LCR 3 ；
The upper asphalt surface layer crack rate of the closed crack is UCR 4 Crack rate MCR of medium asphalt surface layer 4 Lower asphalt surface layer crack rate LCR 4 ；
The upper asphalt pavement crack rate UCR, the middle asphalt pavement crack rate MCR, and the lower asphalt pavement crack rate LCR were calculated by:
the upper asphalt pavement crack rate UCR, the middle asphalt pavement crack rate MCR and the lower asphalt pavement crack rate LCR are obtained according to the above steps: the overall crack rate TCR of the asphalt pavement was calculated by the following formula:
step 4, calculating a layering crack evaluation index: based on the calculated upper layer crack rate UCR, middle layer crack rate MCR, lower layer crack rate LCR and asphalt layer total crack rate TCR in the step 3, carrying out calculation to obtain an upper layer crack condition index UPCI, a middle layer crack condition index MPCI, a lower layer crack condition index LPCI and an asphalt layer total crack condition index TPCI;
step 5, evaluating the classification of the lower asphalt surface layer crack state based on the upper surface layer crack state index UPCI, the layer crack state index MPCI, the surface layer crack state index LPCI and the green surface layer overall crack state index TPCI according to the following table definition:
grading evaluation table for road asphalt surface layer cracks
2. The road asphalt pavement crack evaluation method based on the nondestructive testing technology according to claim 1, wherein the method comprises the following steps:
(1) The crack rate of the upper asphalt surface layer for obtaining the open crack is UCR 1 ：
Medium asphalt surface layer crack rate MCR 1 ：
Lower asphalt surface layer crack rate LCR 1 ：
(2) The upper asphalt surface layer crack rate of the block cracks is UCR obtained by the following method 2 ：
Medium asphalt surface layer crack rate MCR 2 ：
Lower asphalt surface layer crack rate LCR 2 ：
(3) The crack rate of the cracked upper asphalt surface layer is UCR 3 ：
Medium asphalt surface layer crack rate MCR 3 ：
Lower asphalt surface layer crack rate LCR 3 ：
(4) The upper asphalt surface layer crack rate of the closed crack is UCR 4 ：
Medium asphalt surface layer crack rate MCR 4 ：
Lower asphalt surface layer crack rate LCR 4 ：
In the above formula: transverse and longitudinal cracks h of upper asphalt surface layer ui Transverse and longitudinal cracks h of middle asphalt surface layer mi Transverse and longitudinal cracks h of lower asphalt surface layer li Block crack h of upper asphalt surface layer uj Block crack h of medium asphalt surface layer mj Block crack h of lower asphalt surface layer lj Closed crack h of upper asphalt surface layer up Closed crack h of middle asphalt surface layer mp Closed crack h of lower asphalt surface layer lp Length of transverse and longitudinal crack l i Length of closed slit l p Surface integral S of block crack j Surface integral S of crack road * Total number of transverse and longitudinal cracks N in the road section measured 1 Total number of block cracks l 2 Total number of cracks N 3 Total number of closed cracks N 4 Weight ω of severity of transverse and longitudinal cracks i Massive crack severity weight ω j Weight of closed fracture severity omega p 。
3. The road asphalt pavement crack evaluation method based on the nondestructive testing technology according to claim 1, wherein the method comprises the following steps: and (3) judging the evaluation result of the step (4) based on the upper layer crack condition index UPCI, the middle layer crack condition index MPCI, the lower layer crack condition index LPCI and the asphalt layer overall crack condition index TPCI combined with the road asphalt layer crack grading evaluation table in the step (5) as follows:
based on the present criteria, when any index finger of the upper layer crack condition index UPCI, the middle layer crack condition index MPCI, the lower layer crack condition index LPCI, the asphalt layer overall crack condition index TPCI is evaluated as inferior or inferior, it is determined that: repairing measures must be taken for the whole asphalt surface layer;
when the asphalt pavement general crack condition index TPCI index is evaluated as medium, it is determined that: recommending to take repairing measures for the whole asphalt surface layer;
when the asphalt pavement general crack condition index TPCI index is evaluated as good, it is determined that: repairing measures can be taken for the whole asphalt surface layer;
when the asphalt pavement general crack condition index TPCI index is evaluated to be excellent, it is determined that: the asphalt surface layer is in a service state and does not need to be repaired;
when any one of the upper layer crack condition index UPCI, the middle layer crack condition index MPCI, and the lower layer crack condition index LPCI is evaluated as middle, it is determined that: taking necessary repairing measures for the horizon and above;
when any one of the upper layer crack condition index UPCI, the middle layer crack condition index MPCI, and the lower layer crack condition index LPCI is evaluated as good, it is determined that: necessary repair measures can be taken for the horizon and above;
when the upper layer crack condition index UPCI, the middle layer crack condition index MPCI, and the lower layer crack condition index LPCI are all good, it is determined that: the service state of each layer of the asphalt surface layer is healthy and does not need to be repaired.
4. The road asphalt pavement crack evaluation method based on the nondestructive testing technology according to claim 2, wherein the method comprises the following steps:
transverse and longitudinal crack sealingWeight degree weight omega i : omega when the width is less than or equal to 3mm i Taking 0.6 omega when the width is more than 3mm i Taking 1.0;
massive crack severity weight omega j : omega when the blocking degree is more than 1m and the width is 1-2mm j Taking omega when 0.6 and 0.5-1m width of 0.5-1m is more than 2mm j Taking 0.8;
weight of closed fracture severity omega p Taking 0.8.
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