CN109082982B - Method for processing semi-rigid base asphalt pavement cracking - Google Patents
Method for processing semi-rigid base asphalt pavement cracking Download PDFInfo
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Abstract
The invention discloses a method for processing cracking of a semi-rigid base asphalt pavement, which adopts a comprehensive crack tester to detect the crack width and the crack depth of a crack to be detected of the semi-rigid base asphalt pavement; and detecting by adopting a ground penetrating radar GPR to obtain the detection result of each structural layer in the semi-rigid base asphalt pavement, thereby realizing the rapid detection of a semi-rigid pavement disease comprehensive system. In addition, dividing the crack to be detected into crack types by integrating the crack width, the crack depth and the detection result; then, carrying out cracking disease cause analysis on the cracks to be detected in each cracking type; and performing corresponding prevention and treatment on the cracks to be detected in each cracking type based on the structural level and the cracking disease cause corresponding to the cracks to be detected in each cracking type.
Description
Technical Field
The application relates to the technical field of pavement maintenance and repair, in particular to a method for processing cracking of a semi-rigid base asphalt pavement.
Background
In recent years, with the rapid development of high-grade highway construction in China, traffic network is becoming perfect, and the key point of highway construction is gradually developing from large-scale new construction to maintenance and modification stage. The semi-rigid pavement is composed of a stable base layer of inorganic binders such as cement, lime and the like and an asphalt surface layer, and is widely applied to the construction of high-grade highways due to the characteristics of high strength, large bearing capacity, good integrity and the like. However, the semi-rigid pavement has various damages after a period of traffic operation, such as cracks, grout, subsidence, void, pot holes, etc., and the cracks are the most common, most likely and earliest damages in various damages of the asphalt pavement, almost accompany with the whole service life of the asphalt pavement, and are increasingly aggravated along with the increase of the service life of the pavement, which seriously affects the road appearance and driving comfort, and is also the cause of other damages of pavement structures, such as grout, subsidence, etc. With the increasing traffic volume of roads and the increasing of large-tonnage transport vehicles, the diseases of semi-rigid pavements are getting more serious, particularly pavement cracks are the most prominent; if the road surface is not processed in time, the normal use function of the road surface is affected.
At present, the treatment of the semi-rigid pavement cracking diseases in China still mainly depends on the traditional decision-making mode mainly based on experience, and the pavement diseases are treated by methods of crack pouring, micro surfacing, common seal, milling, re-paving, drilling and grouting and the like. Hot asphalt is generally adopted to fill and seal cracks, so that the semi-rigid base layer and the roadbed are prevented from being softened due to underwater seepage of the pavement, but the defects of high filling difficulty, weak adhesion between the asphalt and the cracks, easiness in extrusion due to heating and the like exist; the micro-surfacing, the open sealing layer and the like have good effect of treating surface cracks only under the condition that the quality of a base layer of the pavement is good, if the quality of the base layer is not over-quality, the base layer has uneven compactness, settlement, cracking and the like, a reflection crack can appear on the additionally paved asphalt surface layer quickly, and the service life of some road sections after the cracks are treated is usually less than 1 year; the milling and re-paving can comprehensively improve the characteristics of the surface layer, but the milling and re-paving method has the disadvantages of large engineering quantity, long road closing time and high maintenance cost; the drilling and grouting is a better mode for treating deep diseases below a pavement in a non-excavation mode, but the drilling and grouting has the defects of uncertainty in action effect, poor treatment pertinence and the like.
It can be seen that the problem of pavement cracking diseases cannot be solved fundamentally by the traditional disease treatment measures based on experience, the repeated appearance of cracks after repair cannot be overcome effectively, and the method is difficult to adapt to increasingly heavy traffic transportation requirements.
Disclosure of Invention
The invention provides a method for treating cracking of a semi-rigid base asphalt pavement, which aims to solve or partially solve the problem that the cracking disease of the pavement cannot be fundamentally solved by the traditional disease treatment measures based on experience.
In order to solve the technical problem, the invention provides a method for processing cracking of a semi-rigid base asphalt pavement, which comprises the following steps:
detecting the crack width and the crack depth of a crack to be detected of the semi-rigid base asphalt pavement by adopting a crack comprehensive tester;
detecting by adopting a ground penetrating radar GPR to obtain the detection result of each structural layer in the semi-rigid base asphalt pavement;
dividing the crack to be detected into crack types by integrating the crack width, the crack depth and the detection result;
analyzing the cause of cracking diseases of the cracks to be detected in each cracking type;
and performing corresponding prevention and treatment on the cracks to be detected in each cracking type based on the structural level and the cracking disease cause corresponding to the cracks to be detected in each cracking type.
Preferably, the method for detecting the crack width and the crack depth of the crack to be detected of the semi-rigid base asphalt pavement by adopting the comprehensive crack tester specifically comprises the following steps:
arranging a measuring line along the crack trend of the crack to be measured, enabling a camera on a host of the comprehensive crack tester to correspond to the crack to be measured, and transmitting a crack picture of the crack to be measured to a display screen of the host of the comprehensive crack tester in real time by utilizing the camera, so that the comprehensive crack tester automatically identifies the crack profile of the crack to be measured based on the crack picture, and analyzing and calculating the crack width of the crack to be measured through a microscopic image processing technology;
respectively coupling a transmitting transducer and a receiving transducer of the comprehensive crack tester at symmetrical positions on two sides of the crack to be tested, and moving the transmitting transducer and the receiving transducer in the sampling process to enable the comprehensive crack tester to generate waveforms; when the waveform phase jumps, stopping moving, and recording a first distance between the transmitting transducer and the crack to be tested and a second distance between the receiving transducer and the crack to be tested by using the crack comprehensive tester; and calculating the first distance and the second distance by an ultrasonic method so as to obtain the crack depth of the crack to be detected.
Preferably, the detection result comprises one or more of the following detection parameters: thickness, degree of compaction, loose voids and water content;
the method for obtaining the detection result of each structural layer in the semi-rigid base asphalt pavement by adopting ground penetrating radar GPR detection specifically comprises the following steps:
arranging a survey line along the trend of the crack to be measured by using a ground penetrating radar;
carrying out continuous scanning test on the semi-rigid base asphalt pavement to obtain ground penetrating radar scanning data;
and analyzing the scanning data of the ground penetrating radar according to a dielectric characteristic analysis technology so as to obtain the thickness, the compactness, the water content and the loose cavity condition of each structural layer in the semi-rigid base asphalt pavement.
Preferably, the continuous scanning test is performed on the semi-rigid base asphalt pavement to obtain ground penetrating radar scanning data, and the method specifically includes: carrying out continuous scanning test on the crack to be tested and the peripheral preset area thereof to obtain ground penetrating radar scanning data;
the ground penetrating radar scanning data are analyzed according to a dielectric characteristic analysis technology, and then the thickness, the compactness, the water content and the loose cavity condition of each structural layer in the semi-rigid base asphalt pavement are obtained, and the method specifically comprises the following steps: and analyzing the scanning data of the ground penetrating radar according to a dielectric characteristic analysis technology so as to obtain the thickness, the compactness, the water content and the loose cavity condition of each structural layer in the crack to be detected and the peripheral preset area of the crack to be detected.
Preferably, the cracking types are divided into type I cracking and type II cracking;
the I-type cracking means that the pavement base layer and the parts below the pavement base layer have no obvious defects, and the cracking diseases are only limited to the asphalt surface layer;
the type II cracking means that the pavement surface layer is cracked, and the base layer and the parts below the base layer are also cracked or have other obvious defects.
Preferably, the analyzing the cause of the cracking disease of the crack to be detected in each cracking type specifically includes:
analyzing and obtaining a cracking disease cause of the crack to be detected according to the crack characteristics of the crack to be detected and the detection result, wherein the cracking disease cause comprises the following steps: the characteristics of the raw materials of the pavement, the thickness and the strength of the structural layer of the pavement, temperature shrinkage or fatigue, vehicle load fatigue, water content, compactness, loose cavities, roadbed strength and uniformity thereof;
and analyzing and determining key factors for forming the cracking disease cause one by one according to the cracking disease cause of the crack to be detected and the detection result.
Preferably, after the crack disease cause causing the crack to be detected is obtained by analyzing according to the crack characteristic of the crack to be detected and the detection result, the method further includes:
analyzing and obtaining the cracking disease cause of the type I cracking according to the crack characteristics of the crack to be detected and the detection result; wherein the origin of the cracking disease of the type I cracking comprises: temperature shrinkage or temperature stress fatigue cracks, vehicle load fatigue cracks, insufficient pavement structure thickness or strength, improper asphalt concrete material or mixing ratio;
analyzing and obtaining the cracking disease cause of the II-type cracking according to the crack characteristics of the crack to be detected and the detection result; wherein the causes of the cracking diseases of the type II cracking comprise: semi-rigid base warm shrinkage or dry shrinkage cracks, vehicle load fatigue cracks, insufficient pavement base strength, large water content, loose cavities and uneven roadbed compaction.
Preferably, the performing, on the basis of the structural hierarchy and the cracking disease cause corresponding to each crack to be detected in each cracking type, the corresponding control treatment on the crack to be detected in each cracking type includes:
and (3) performing corresponding prevention and treatment on the type I cracking: when the type I cracking of the semi-rigid base asphalt pavement occurs and the density of the surface layer cracks is smaller than the preset density, one or more preventive maintenance means of sealing and filling the cracks, micro-surfacing and open-close layers by SBS modified emulsified asphalt is adopted; and when the semi-rigid base asphalt pavement has the I-type cracks and the crack density is greater than the preset density, improving the structural characteristics of the pavement through thermal regeneration or milling and re-paving.
Preferably, the performing, on the basis of the structural hierarchy and the cracking disease cause corresponding to each crack to be detected in each cracking type, the corresponding control treatment on the crack to be detected in each cracking type includes:
and (3) performing corresponding prevention treatment on the II-type cracking: and when the II-type cracking of the semi-rigid base asphalt pavement occurs, adopting one or more measures such as arranging a waterproof layer, a gravel drainage blind ditch, drilling and grouting and the like to treat the II-type cracked pavement.
Preferably, the performing, on the basis of the structural hierarchy and the cracking disease cause corresponding to each crack to be detected in each cracking type, the corresponding control treatment on the crack to be detected in each cracking type includes:
and (3) performing corresponding prevention treatment on the II-type cracking: the development of reflection cracks is inhibited by arranging one or more measures in an anti-cracking buffer layer of the geotextile, the steel fiber and the rubber asphalt macadam mixture.
Through one or more technical schemes of the invention, the invention has the following beneficial effects or advantages:
the invention discloses a method for processing cracking of a semi-rigid base asphalt pavement, which adopts a comprehensive crack tester to detect the crack width and the crack depth of a crack to be detected of the semi-rigid base asphalt pavement; and detecting by adopting a ground penetrating radar GPR to obtain the detection result of each structural layer in the semi-rigid base asphalt pavement, thereby realizing the rapid detection of a semi-rigid pavement disease comprehensive system. In addition, dividing the crack to be detected into crack types by integrating the crack width, the crack depth and the detection result; then, carrying out cracking disease cause analysis on the cracks to be detected in each cracking type; and performing corresponding prevention and treatment on the cracks to be detected in each cracking type based on the structural level and the cracking disease cause corresponding to the cracks to be detected in each cracking type. The treatment method is completely based on the characteristics of semi-rigid pavement and cracking causes, is provided according to the pavement structure mechanical design principle, has the characteristics of strong pertinence, good durability, obvious treatment effect and the like, and avoids repeated repair of pavement cracking diseases. The invention integrates nondestructive detection technologies such as a crack comprehensive tester, a ground penetrating radar and the like with pavement cracking disease cause diagnosis and disease treatment technologies, provides an advanced, scientific and efficient complete technology for detection, analysis diagnosis, maintenance and repair of the cracking diseases of the semi-rigid base asphalt pavement, and has better technical and economic benefits.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a flow chart illustrating a method for treating a semi-rigid base asphalt pavement cracking in accordance with one embodiment of the present invention;
FIG. 2 illustrates a schematic diagram of the classification of semi-rigid base asphalt pavement cracking according to one embodiment of the present invention.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.
One or more embodiments of the invention aim to provide a method for processing cracking of a semi-rigid base asphalt pavement, aiming at the defects and shortcomings in the prior art, and by comprehensively detecting and diagnosing the cracking diseases of the semi-rigid base asphalt pavement and the cause, specific treatment measures are made, so that the cracking problem commonly existing in the current semi-rigid pavement can be effectively solved, and the purposes of improving driving comfort, improving the service performance of the pavement and prolonging the service life of the highway are achieved.
Specifically, the following three parts are included: the nondestructive testing technology for the cracking diseases of the semi-rigid base asphalt pavement comprises the following steps: nondestructive testing instruments such as a crack comprehensive tester and a Ground Penetrating Radar (GPR) are adopted to detect the width and the depth of the pavement crack, the thickness of each structural layer, the spatial position and the form of uneven media such as loose cavities, water and the like, so that the rapid detection of a semi-rigid pavement disease comprehensive system is realized; secondly, a diagnosis method for the cause of cracking diseases of the semi-rigid base asphalt pavement comprises the following steps: according to factors causing pavement cracking, the main causes of crack generation are analyzed and determined one by one from the aspects of raw material characteristics, vehicle load, pavement structure, natural environment, roadbed strength, uniformity and the like, and the cause of disease is objectively and scientifically found; thirdly, a method for treating cracking diseases of semi-rigid base asphalt pavement: according to the weight and the expansion rate of pavement cracking diseases and the severity of the influence caused by the pavement cracking diseases, the method of sealing and plugging seams, arranging a heat-insulating waterproof layer and an anti-cracking buffer layer, milling and re-paving or thermal regeneration and the like is adopted in a targeted manner to flexibly combine and treat various pavement cracking diseases in a classified manner. The treatment method is completely based on the characteristics of semi-rigid pavement and cracking causes, is provided according to the pavement structure mechanical design principle, has the characteristics of strong pertinence, good durability, obvious treatment effect and the like, and avoids repeated repair of pavement cracking diseases. The invention integrates nondestructive detection technologies such as a crack comprehensive tester, a ground penetrating radar and the like with pavement cracking disease cause diagnosis and disease treatment technologies, provides an advanced, scientific and efficient complete technology for detection, analysis diagnosis, maintenance and repair of the cracking diseases of the semi-rigid base asphalt pavement, and has better technical and economic benefits.
To further illustrate and explain the present invention, referring now to FIG. 1, an embodiment of the present invention comprises the following steps:
and 11, detecting the crack width and the crack depth of the crack to be detected of the semi-rigid base asphalt pavement by adopting a comprehensive crack tester.
In the specific implementation process, the crack width of the crack to be detected is completed through the following implementation steps:
and arranging a measuring line along the crack trend of the crack to be measured, and enabling the camera on the host machine of the comprehensive crack tester to correspond to the crack to be measured, for example, placing the camera on the host machine of the comprehensive crack tester above the crack to be measured, so that the camera can acquire crack data of the crack to be measured. And transmitting the crack picture of the crack to be tested to a host computer display screen of the comprehensive crack tester in real time by using a camera. If the image is clear, the comprehensive crack tester can automatically identify the crack profile of the crack to be tested based on the crack image, and the crack width of the crack to be tested is obtained through analysis and calculation by a microscopic image processing technology.
In the specific implementation process, the crack depth of the crack to be detected is completed through the following implementation steps:
respectively coupling a transmitting transducer and a receiving transducer of the comprehensive crack tester at symmetrical positions on two sides of the crack to be tested, and moving the transmitting transducer and the receiving transducer in the sampling process to enable the comprehensive crack tester to generate waveforms; when the waveform phase jumps, stopping moving, and recording a first distance between the transmitting transducer and the crack to be tested and a second distance between the receiving transducer and the crack to be tested by using the crack comprehensive tester; and calculating the first distance and the second distance by an ultrasonic method so as to obtain the crack depth of the crack to be detected.
And step 12, obtaining the detection result of each structural layer in the semi-rigid base asphalt pavement by adopting GPR (general GPR) detection.
The detection result comprises one or more of the following detection parameters: the thickness, the compactness, the loose cavities and the water content of each structural layer of the pavement. Therefore, in the detection process, parameters such as the thickness, the compactness, the loose cavities, the water content and the like of each structural layer of the pavement are mainly detected by adopting a Ground Penetrating Radar (GPR).
In the specific detection process, firstly, a ground penetrating radar is used for arranging a measuring line along the trend of the crack to be detected; then, carrying out continuous scanning test on the semi-rigid base asphalt pavement to obtain ground penetrating radar scanning data; and then, arranging the ground penetrating radar data according to a dielectric characteristic analysis technology to obtain the thickness of each structural layer of the pavement, the compactness of each structural layer of the pavement, the water content of each structural layer of the pavement and the loose cavity condition of each structural layer of the pavement, thereby finding out the specific part with the internal defect of the pavement and providing a basis for the next disease cause diagnosis and analysis.
And in order to further accurately obtain the disease cause of the crack to be detected, the detection cost is saved. Generally, a predetermined area around the crack to be tested is tested. The specific implementation process is as follows: arranging a survey line along the trend of the crack to be measured by using a ground penetrating radar; carrying out continuous scanning test on the crack to be tested and the peripheral preset area thereof to obtain ground penetrating radar scanning data; and analyzing the ground penetrating radar scanning data according to a dielectric characteristic analysis technology to further obtain the thickness of each structural layer in the crack to be detected and the peripheral preset area of the crack to be detected, the compactness of each structural layer in the crack to be detected and the peripheral preset area of the crack to be detected, the water content of each structural layer in the crack to be detected and the peripheral preset area of the crack to be detected, and the loose cavity condition of each structural layer in the crack to be detected and the peripheral preset area of the crack to be detected.
And 13, dividing the crack to be detected into crack types by integrating the crack width, the crack depth and the detection result.
In the specific implementation process, according to the crack width of the crack to be detected and the crack depth of the crack to be detected, which are detected by the comprehensive crack tester, and the thickness, the compactness, the water content, the loose cavity and other conditions of each structural layer of the pavement, which are obtained by scanning and finishing through the ground penetrating radar, the cracking types are divided into the type I cracking and the type II cracking: the I-type cracking refers to that the pavement base layer and the parts below the pavement base layer (namely including the base layer) have no obvious defects, and the cracking diseases are only limited to the asphalt surface layer; the type II cracking means that the pavement surface layer has cracked, and the base layer and the parts below (i.e., including the base layer) also have cracked or have other obvious defects.
According to the description of the embodiments, one or more embodiments realize the rapid nondestructive detection of the semi-rigid pavement diseases from outside to inside in a comprehensive system, overcome the defect that the existing semi-rigid base pavement cracking diseases are mainly judged manually and empirically, and provide reliable basis for disease cause diagnosis and analysis.
And 14, analyzing the cause of cracking diseases of the cracks to be detected in each cracking type.
Analyzing and obtaining a cracking disease cause of the crack to be detected according to the crack characteristics of the crack to be detected and the detection result, wherein the cracking disease cause comprises the following steps: raw material properties of the pavement, thickness and strength of the structural layer of the pavement, temperature shrinkage or fatigue, vehicle load fatigue, moisture content, compaction, loose voids, subgrade strength and uniformity thereof, and the like.
The following specific diagnosis and analysis are carried out on the causes of two major types of cracking diseases one by one:
type I cracking: analyzing and obtaining a cracking disease cause causing the I-type cracking of the pavement according to the crack characteristics of the crack to be detected and the detection result; wherein the origin of the cracking disease of the type I cracking comprises: temperature shrinkage or temperature stress fatigue cracks, vehicle load fatigue cracks, insufficient pavement structure thickness or strength, improper asphalt concrete material or mixing ratio and the like.
Type II cracking: analyzing and obtaining a cracking disease cause causing the II-type cracking of the pavement according to the crack characteristics of the crack to be detected and the detection result; wherein the causes of the cracking diseases of the type II cracking comprise: semi-rigid base warm shrinkage or dry shrinkage cracks, vehicle load fatigue cracks, insufficient pavement base strength, large water content, loose cavities, uneven roadbed compaction and the like.
Further, the crack disease cause of the crack to be detected and the detection result are combined, and key factors forming the crack disease cause are analyzed and determined one by one. Furthermore, local core drilling and sampling on site are supplemented to carry out indoor experiments or calculation and verification are carried out when necessary, and the disease cause is ensured to be accurately found.
The advantages of this embodiment are: according to the detected crack width and crack depth, the efficiency and reliability of disease cause analysis are greatly improved by combining ground penetrating radar scanning data, the defect that the current semi-rigid base pavement cracking disease diagnosis depends on empirical judgment is overcome, and a foundation is laid for adopting an effective pavement cracking disease treatment method.
And step 15, performing corresponding prevention and treatment on the cracks to be detected in each cracking type based on the structural level and the cracking disease cause corresponding to the cracks to be detected in each cracking type.
Specifically, aiming at the difference of the two crack layers and causes, the method of sealing and plugging the cracks, arranging a heat-insulating waterproof layer and an anti-cracking buffer layer by SBS modified emulsified asphalt, improving the characteristics of pavement materials by milling, re-paving or thermal regeneration and the like can be adopted in a targeted manner, and the method can be flexibly combined to classify and treat the pavement cracking diseases of different degrees.
The respective descriptions are as follows.
Type I cracking.
The method is used for performing corresponding prevention and treatment on the type I cracking, and specifically comprises the following steps:
when the initial stage of the disease is detected, the type I cracking of the semi-rigid base asphalt pavement occurs, but the density of the surface layer cracks is smaller than the preset density, at the moment, one or more preventive maintenance measures such as sealing and filling of the cracks, micro-surfacing and open-cover sealing of SBS modified emulsified asphalt are adopted, otherwise, rainwater and other impurities enter the base layer and the roadbed of the pavement along the cracks, so that the bearing capacity of the pavement is rapidly reduced, and the local or piece damage of the pavement is accelerated.
And when the disease is in the middle and later stages, the I-type crack of the semi-rigid base asphalt pavement occurs, and the density of the surface layer crack is greater than the preset density. In addition, irregular reticulation and cracking may accompany it. At the moment, the structural characteristics of the pavement are improved through thermal regeneration or milling and re-paving, otherwise, rainwater seeps into the crack and causes other diseases such as purfling, sinking, pits and the like, and the driving safety is seriously affected.
Type II cracking. When the cracks appear on the pavement, the key causes of the cracks are detected and diagnosed by adopting a heat-insulating waterproof layer to prevent temperature shrinkage and cracks, a drilling and grouting technology to reinforce the bearing capacity, an anti-cracking buffer layer to prevent cracking and inhibit the development of reflection cracks, and the method is combined with milling, re-paving or thermal regeneration and other methods for use.
The method is used for performing corresponding prevention and treatment on type II cracking, and specifically comprises the following steps:
when the II-type cracking of the semi-rigid base asphalt pavement occurs, and when the cracking diseases occur on the pavement, one or more measures such as arranging a waterproof layer, a gravel drainage blind ditch, drilling and grouting and the like are adopted to treat the pavement in the II-type cracking in combination with the disease cause of detection and diagnosis. In addition, the corresponding prevention and treatment is carried out on the type II cracking, and the development of the reflection cracks can be inhibited by arranging one or more measures of an anti-cracking buffer layer of the geotextile, the steel fiber and the rubber asphalt macadam mixture.
In the specific implementation process, the above-described treatment measures "the rubber asphalt macadam mixture anti-cracking buffer layer is arranged between the asphalt surface layer and the base layer", "the geotextile and the modified asphalt stress absorption film are arranged between the asphalt surface layer and the base layer", "the waterproof layer is arranged between the asphalt surface layer and the base layer", "the steel fiber is added into the semi-rigid base layer material", "the macadam drainage blind ditch is arranged below the compact and defect-free part of the base layer at the position where the water content of the roadbed exceeds the preset water content", and meanwhile, foam concrete recharging "and" drilling mud jacking "can be combined at will or used independently.
Further, when one or more layer structures such as rubber asphalt macadam mixture crack control buffer layer, geotechnological cloth, modified asphalt stress absorption membrane, waterproof layer set up between asphalt surface course and basic unit, the upper and lower floor relation of these layer structures can set up wantonly, and this application does not do the restriction to the upper and lower floor relation of layer structure, as long as set up between asphalt surface course and basic unit can. For example, the layer structure from bottom to top may be: the base layer, rubber asphalt macadam mixture crack control buffer layer, geotechnical cloth, modified asphalt stress absorption membrane, waterproof layer, asphalt surface course and the like, also can be base layer, rubber asphalt macadam mixture crack control buffer layer, waterproof layer, modified asphalt stress absorption membrane, asphalt surface course and the like, and the layer structure can be set according to actual conditions.
The method is provided based on the semi-rigid pavement characteristics and the crack disease detection result and cause analysis and according to the pavement structure mechanical design principle, has the characteristics of strong treatment pertinence, good controllability and good durability, and avoids repeated repair of pavement cracks.
Specific implementations and effects of various measures for preventing the type II cracking are described below.
The rubber asphalt macadam mixture anti-cracking buffer layer is arranged between the asphalt surface layer and the base layer, so that the generation and the extension of reflection cracks can be effectively inhibited, and the service life and the service state of a pavement structure are improved; meanwhile, the geotextile and the modified asphalt stress absorption film are arranged between the asphalt surface layer and the base layer, so that the asphalt surface layer has a load buffering function and a deformation coordination function, and the overall performance is improved.
Furthermore, a waterproof layer is arranged between the asphalt surface layer and the base layer, so that moisture can be prevented from permeating into the base layer of the pavement, the cracks can be prevented from continuously spreading upwards under the action of load, the durability of the repaired pavement is good, and the economic benefit is remarkable.
Furthermore, the steel fiber is added into the semi-rigid base material, so that the tensile capacity of the whole semi-rigid base is enhanced, the good tensile property of the steel fiber can completely bear the heat sink and drying shrinkage stress of the semi-rigid base, and the reflection and propagation of the crack of the base are prevented.
Furthermore, a gravel drainage blind ditch is arranged below a dense and non-defective part of the base layer at a position with overlarge water content of the roadbed, and foam concrete with light weight and high construction speed is adopted for recharging, so that the overlying load of the blind ditch can be effectively reduced, and the influence of extrusion deformation and clogging of the blind ditch on the drainage effect is avoided.
Referring to table 1, table 1 shows a specific control method of the treatment method for cracking of a semi-rigid base asphalt pavement according to one or more embodiments of the present invention.
TABLE 1
Referring now to FIG. 2, this example is a classified manner of semi-rigid base asphalt pavement cracking control treatment for the purpose of more visually illustrating and explaining the present invention.
And step 21, cracking the semi-rigid base asphalt pavement.
And step 22, detecting the width and the depth of the crack (of the crack to be detected) by using a crack comprehensive tester.
And step 23, detecting internal defects such as pavement structure thickness, compactness, loose cavities, water content and the like by adopting a ground penetrating radar GPR.
And 24, judging the pavement cracking type.
If the type I cracking is detected, executing the step 25, and sealing and plugging the crack, the micro-surfacing, the common seal layer and the like by adopting SBS modified emulsified asphalt at the initial stage of the crack; and measures such as thermal regeneration or milling, re-paving and the like are adopted in the middle and later stages of the crack.
If the cracking is in the type II, executing the step 26, and arranging a stress absorption film such as geotextile, a steel wire mesh and the like and a rubber asphalt macadam anti-cracking buffer layer to inhibit the development of reflection cracks; reinforcing the bearing capacity of the base layer by adopting methods such as steel fiber, drilling and grouting and the like; the characteristics of the surface layer material are improved by adopting a planing, milling, re-paving or thermal regeneration method; arranging a waterproof layer and a drainage blind ditch; drilling and grouting to reinforce the deep layer with insufficient load and fill the loose space.
Through one or more embodiments of the present invention, the present invention has the following advantageous effects or advantages:
the invention discloses a method for processing cracking of a semi-rigid base asphalt pavement, which adopts a comprehensive crack tester to detect the crack width and the crack depth of a crack to be detected of the semi-rigid base asphalt pavement; and detecting by adopting a ground penetrating radar GPR to obtain the detection result of each structural layer in the semi-rigid base asphalt pavement, thereby realizing the rapid detection of a semi-rigid pavement disease comprehensive system. In addition, dividing the crack to be detected into crack types by integrating the crack width, the crack depth and the detection result; then, carrying out cracking disease cause analysis on the cracks to be detected in each cracking type; and performing corresponding prevention and treatment on the cracks to be detected in each cracking type based on the structural level and the cracking disease cause corresponding to the cracks to be detected in each cracking type. The treatment method is completely based on the characteristics of semi-rigid pavement and cracking causes, is provided according to the pavement structure mechanical design principle, has the characteristics of strong pertinence, good durability, obvious treatment effect and the like, and avoids repeated repair of pavement cracking diseases. The invention integrates nondestructive detection technologies such as a crack comprehensive tester, a ground penetrating radar and the like with pavement cracking disease cause diagnosis and disease treatment technologies, provides an advanced, scientific and efficient complete technology for detection, analysis diagnosis, maintenance and repair of the cracking diseases of the semi-rigid base asphalt pavement, and has better technical and economic benefits.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (8)
1. A method for treating cracking of a semi-rigid base asphalt pavement, which is characterized by comprising the following steps:
detecting the crack width and the crack depth of a crack to be detected of the semi-rigid base asphalt pavement by adopting a crack comprehensive tester;
the method for detecting the semi-rigid base asphalt pavement by adopting the ground penetrating radar GPR comprises the following steps: arranging a survey line along the trend of the crack to be measured by using a ground penetrating radar; carrying out continuous scanning test on the semi-rigid base asphalt pavement to obtain ground penetrating radar scanning data; analyzing the scanning data of the ground penetrating radar according to a dielectric characteristic analysis technology so as to obtain the thickness, compactness, water content and loose cavity condition of each structural layer in the semi-rigid base asphalt pavement;
dividing the crack to be detected into crack types by integrating the crack width, the crack depth and the detection result; the cracking types are divided into type I cracking and type II cracking; the I-type cracking means that the pavement base layer and the parts below the pavement base layer have no obvious defects, and the cracking diseases are only limited to the asphalt surface layer; the II-type cracking means that the pavement surface layer is cracked, and the base layer and the parts below the base layer are also cracked or have other obvious defects;
analyzing the cause of cracking diseases of the cracks to be detected in each cracking type;
and performing corresponding prevention and treatment on the cracks to be detected in each cracking type based on the structural layer and the cracking disease cause corresponding to the cracks to be detected in each cracking type.
2. The method of claim 1, wherein the detecting the crack width and the crack depth of the crack to be detected of the semi-rigid base asphalt pavement by using a crack comprehensive tester comprises:
arranging a measuring line along the crack trend of the crack to be measured, enabling a camera on a host of the comprehensive crack tester to correspond to the crack to be measured, and transmitting a crack picture of the crack to be measured to a display screen of the host of the comprehensive crack tester in real time by utilizing the camera, so that the comprehensive crack tester automatically identifies the crack profile of the crack to be measured based on the crack picture, and analyzing and calculating the crack width of the crack to be measured through a microscopic image processing technology;
respectively coupling a transmitting transducer and a receiving transducer of the comprehensive crack tester at symmetrical positions on two sides of the crack to be tested, and moving the transmitting transducer and the receiving transducer in the sampling process to enable the comprehensive crack tester to generate waveforms; when the waveform phase jumps, stopping moving, and recording a first distance between the transmitting transducer and the crack to be tested and a second distance between the receiving transducer and the crack to be tested by using the crack comprehensive tester; and calculating the first distance and the second distance by an ultrasonic method so as to obtain the crack depth of the crack to be detected.
3. The method of claim 1,
the method comprises the following steps of carrying out continuous scanning test on the semi-rigid base asphalt pavement to obtain ground penetrating radar scanning data, and specifically comprises the following steps: carrying out continuous scanning test on the crack to be tested and the peripheral preset area thereof to obtain ground penetrating radar scanning data;
the ground penetrating radar scanning data are analyzed according to a dielectric characteristic analysis technology, and then the thickness, the compactness, the water content and the loose cavity condition of each structural layer in the semi-rigid base asphalt pavement are obtained, and the method specifically comprises the following steps: and analyzing the scanning data of the ground penetrating radar according to a dielectric characteristic analysis technology so as to obtain the thickness, the compactness, the water content and the loose cavity condition of each structural layer in the crack to be detected and the peripheral preset area of the crack to be detected.
4. The method according to claim 1, wherein the analysis of the cause of the cracking disease of the crack to be detected in each cracking type specifically comprises:
analyzing and obtaining a cracking disease cause of the crack to be detected according to the crack characteristics of the crack to be detected and the detection result, wherein the cracking disease cause comprises the following steps: the characteristics of the raw materials of the pavement, the thickness and the strength of the structural layer of the pavement, temperature shrinkage or fatigue, vehicle load fatigue, water content, compactness, loose cavities, roadbed strength and uniformity thereof;
and analyzing and determining key factors for forming the cracking disease cause one by one according to the cracking disease cause of the crack to be detected and the detection result.
5. The method according to claim 4, wherein after analyzing and obtaining the cause of the cracking disease causing the crack to be detected according to the crack characteristics of the crack to be detected and the detection result, the method further comprises:
analyzing and obtaining the cracking disease cause of the type I cracking according to the crack characteristics of the crack to be detected and the detection result; wherein the origin of the cracking disease of the type I cracking comprises: temperature shrinkage or temperature stress fatigue cracks, vehicle load fatigue cracks, insufficient pavement structure thickness or strength, improper asphalt concrete material or mixing ratio;
analyzing and obtaining the cracking disease cause of the II-type cracking according to the crack characteristics of the crack to be detected and the detection result; wherein the causes of the cracking diseases of the type II cracking comprise: semi-rigid base warm shrinkage or dry shrinkage cracks, vehicle load fatigue cracks, insufficient pavement base strength, large water content, loose cavities and uneven roadbed compaction.
6. The method according to claim 1, wherein the performing of the corresponding control treatment on the crack to be detected in each cracking type based on the structural hierarchy and the cracking disease cause corresponding to each crack to be detected in each cracking type comprises:
and (3) performing corresponding prevention and treatment on the type I cracking: when the type I cracking of the semi-rigid base asphalt pavement occurs and the density of the surface layer cracks is smaller than the preset density, one or more preventive maintenance means of SBS modified emulsified asphalt sealing and plugging, micro surfacing and open sealing are adopted; and when the semi-rigid base asphalt pavement has the I-type cracks and the crack density is greater than the preset density, improving the structural characteristics of the pavement through thermal regeneration or milling and re-paving.
7. The method according to claim 1, wherein the performing of the corresponding control treatment on the crack to be detected in each cracking type based on the structural hierarchy and the cracking disease cause corresponding to each crack to be detected in each cracking type comprises:
and (3) performing corresponding prevention treatment on the II-type cracking: and when the II-type cracking of the semi-rigid base asphalt pavement occurs, adopting one or more measures of arranging a waterproof layer, a gravel drainage blind ditch and drilling and grouting to treat the II-type cracked pavement.
8. The method according to claim 1, wherein the performing of the corresponding control treatment on the crack to be detected in each cracking type based on the structural hierarchy and the cracking disease cause corresponding to each crack to be detected in each cracking type comprises:
and (3) performing corresponding prevention treatment on the II-type cracking: the development of reflection cracks is inhibited by arranging one or more measures in an anti-cracking buffer layer of the geotextile, the steel fiber and the rubber asphalt macadam mixture.
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