Sampling detection method for quality of asphalt concrete pavement of expressway

Abstract

The invention belongs to the technical field of highway asphalt concrete pavement quality sampling detection, and discloses a highway asphalt concrete pavement quality sampling detection method. The method comprises the following specific steps: S1, sampling position selection and field detection; s2, preparing a sampling tool and equipment; s3, cleaning a sampling area; s4, drilling a pavement sample; s5, extracting and packaging a sample; s6, transporting and storing the sample; and S7, laboratory detection and analysis. The highway asphalt concrete pavement quality sampling detection method has remarkable advantages, data is accumulated by means of the laser range finder, accurate sample drilling can be assisted, a sampling plan can be scientifically formulated, human errors are reduced, the working efficiency is improved, the extraction and packaging link pays attention to sample protection, the integrity and original characteristics of the sample are ensured, and the method is suitable for large-scale popularization and application. In the transportation process, shock absorption, moisture prevention and stability are achieved, it is guaranteed that samples are stable, and a solid foundation is provided for follow-up laboratory detection and pavement quality evaluation.

Description

Technical Field

[0001] The invention belongs to the technical field of sampling and detecting the quality of asphalt concrete pavement of highways, and in particular relates to a sampling and detecting method for the quality of asphalt concrete pavement of highways. Background Art

[0002] Expressways occupy a key position in modern transportation, and their asphalt concrete pavements are widely used. This type of pavement is paved with asphalt and mineral aggregates in a specific proportion, and has good smoothness, driving comfort, and a certain degree of noise reduction. However, it is exposed to complex environments for a long time and bears heavy traffic loads, making it prone to defects such as rutting, cracks, and potholes. These defects not only affect driving safety and smoothness, but also increase maintenance costs. Therefore, it is important to have a deep understanding of the characteristics and quality status of expressway asphalt concrete pavements, conduct quality sampling and testing, and formulate targeted construction and maintenance plans through data analysis, in order to ensure the long-term stable operation and efficient use of highways.

[0003] At present, when sampling and testing the quality of asphalt concrete pavement on highways, operators are required to adjust the size through manual measurement, which will result in different sizes of drilled samples and inconsistent sampling plan standards. It is impossible to timely discover that the wear of the drill barrel may reduce the diameter of the drilled sample, or that the sample is too thick or too thin due to improper control of the drilling depth. Especially for the top pavement of highway bridge decks, culverts, and tunnels, drilling too deep may cause damage to the underlying structure, bringing secondary hazards, and increase the occurrence of human operational errors, further increasing the workload. At the same time, it is impossible to quickly adapt to the drilling of different highway pavements and exchange for a suitable drill barrel to keep the samples taken from different sampling points consistent. It is necessary to improve and optimize the sampling and testing method of the quality of asphalt concrete pavement on highways. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for sampling and detecting the quality of asphalt concrete pavement of a highway to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a method for sampling and testing the quality of an asphalt concrete pavement on a highway. The specific steps of the method for sampling and testing the quality of an asphalt concrete pavement on a highway are as follows: S1: Sampling location selection and on-site testing: Select representative sampling points at different locations on the driving lanes and overtaking lanes of the highway, and then conduct on-site testing; S2: Prepare sampling tools and equipment: Select a suitable road sampling drill for water drilling, prepare a container for holding the sample, and equip with measuring tools; S3: Clean the sampling area: Use cleaning tools to clean the debris, dust and loose particles around the sampling point to ensure that the road surface in the sampling area is clean; S4: Drilling pavement samples: Place the sampling drill at the selected sampling location, adjust the angle and verticality of the drill so that the drill bit is perpendicular to the pavement surface, and then start the laser rangefinder to record the drilling depth; S5: Extract and seal the sample: When the drilling reaches the predetermined depth, stop the drill, carefully pull the sample out of the road surface, and use a clamp with a soft chuck to gently separate the sample from the sampling point; S6: Transport and store samples: Place the packaged samples in a shock-absorbing, stable transport box; S7: Laboratory testing and analysis: According to the requirements of the test items, the samples are tested for various performance indicators.

[0006] Preferably, the specific steps of sampling location selection and on-site detection in S1 are as follows: Step 1: Data collection and analysis: Collect construction files of the expressway and learn in detail about the design parameters, construction technology, and material specifications of the pavement structure layer; Step 2: Screening of representative sections: Select sections of the highway with typical traffic load characteristics in the driving lanes and overtaking lanes; Step 3: Determine the specific sampling locations: Within the selected representative road section, determine the appropriate sampling interval based on the length of the section. For a 10-kilometer section, set the sampling interval to 1 kilometer. Step 4: Pavement point inspection: Randomly select representative points for core sampling, and conduct indoor tests on indicators such as core sample thickness, porosity, mineral gradation and asphalt content to evaluate the quality of the pavement project.

[0007] Preferably, the preparation of sampling tools and equipment in S2 refers to preparing a road sampling drill, preparing sealed plastic bags for holding samples, and marking them to prevent sample confusion, and equipping them with measuring tools for accurately measuring the sampling position and sample size.

[0008] Preferably, cleaning the sampling area in S3 refers to using a cleaning tool to clean up the debris, dust and loose particles around the sampling point to ensure that the road surface in the sampling area is clean, so as to prevent impurities from mixing into the sample and affecting the accuracy of the test results, and to ensure that the sample taken can truly reflect the original quality condition of the road surface.

[0009] Preferably, the specific steps of drilling the road surface sample in S4 are as follows: Step 1: Position the drill and adjust the angle: Carefully move the sampling drill to the top of the pre-selected and cleaned sampling point, ensuring that the base of the drill is placed stably on the road surface to avoid shaking or tilting; Step 2: Drilling process control: After completing the positioning and angle adjustment of the drill rig, start the power system of the drill rig and slowly put it into working state. The installation position of the laser rangefinder should ensure that the laser beam it emits can vertically illuminate the sampling point or sampling area. Step 3: Drilling depth monitoring and abnormality handling: Start the laser rangefinder, which calculates the distance by emitting laser pulses and measuring their round-trip time. The total length of the drill tube is reduced by the depth of the drill tube entering the road surface. The laser recorder then calculates the difference between the standard length and the remaining length to get the drilling depth of the road surface. In this process, it processes the measured distance data in the form of a digital signal. The internal microprocessor accurately times the time interval between the emission and reception of the light pulse and calculates the distance value based on the speed of light. The round-trip time of the light pulse is t, and the speed of light is c. The distance ct, this distance value will be converted into a storable digital format and then recorded in the data processor.

[0010] Preferably, the specific steps of extracting and packaging the sample in S5 are as follows: Step 1: Stop drilling and pull out the drill bit: When the laser rangefinder shows that the drill bit has reached the predetermined drilling depth, immediately operate the control panel of the drill rig to stop the operation of the drill rig smoothly; Step 2: Sample extraction and transfer: Use a clamp with soft chuck to gently separate the sample from the drill bit; Step 3: Sample packaging and information recording: For samples placed in the container, choose a suitable sealed plastic bag according to the sampling position and number, and tie the bag mouth tightly to ensure the tightness of the packaging and prevent external impurities and moisture from entering the container and affecting the quality of the sample.

[0011] Preferably, transporting and storing samples in S6 refers to placing the packaged samples in a shock-absorbing and moisture-proof transport box to avoid being affected by collision, vibration and temperature changes during transportation. During transportation, the transport box is kept stable to prevent displacement or damage of the samples.

[0012] Preferably, the specific steps of the laboratory test in S7 are as follows: Step 1: Appearance inspection: Take out the sample and first observe its appearance, including the coverage of asphalt and aggregate, the uniformity of aggregate distribution, and whether there are obvious cracks or segregation. Measure the thickness of the core sample to analyze whether the pavement paving thickness meets the requirements. Step 2: Content determination: The asphalt content in the asphalt concrete sample is determined by centrifugal separation. The centrifugal separation method uses centrifugal force to separate the asphalt from the aggregate. The asphalt content is calculated by weighing and the particle composition of the aggregate is analyzed to evaluate whether the grading rationality of the asphalt mixture and the asphalt dosage meet the design requirements. Step 3: Data Analysis: Based on the test data and analysis results, write an asphalt pavement core sampling test report. The report should include the test purpose, test methods, test results and analysis, and organize and analyze the test data to derive the performance indicators of the asphalt pavement, providing a basis for road maintenance, renovation and optimization.

[0013] The beneficial effects of the present invention are as follows: 1. The present invention accumulates data recorded by the laser rangefinder equipment, which will effectively assist the staff to accurately drill different sample sizes. The staff can formulate a more scientific sampling plan, avoid the situation where the diameter of the drilled sample may become smaller due to the wear of the drill barrel not being discovered in time, or the sample is too thick or too thin due to improper drilling depth control, reduce the damage to the road surface caused by repeated drilling, and accurately control the thickness to reduce the damage to the underlying structure. It also reduces the occurrence of human operation errors, improves the accuracy and automation of drilling depth control, further increases work efficiency, realizes the same sampling of different road surfaces, and facilitates cutting and comparison of core samples in indoor tests.

[0014] 2. The present invention can effectively prevent the drill bit from causing additional damage to the drilled sample, thereby ensuring the integrity of the sample. Secondly, the use of soft chuck fixtures allows gentle operation during sample extraction and transfer, minimizing damage to the sample structure and ensuring its original characteristics. Rigorous sample packaging and detailed information recording can not only prevent impurities and moisture from affecting sample quality, but also provide accurate traceability basis for subsequent testing, making the entire sampling and testing process more scientific and standardized, and improving the reliability and effectiveness of road quality testing.

[0015] 3. The present invention can effectively prevent samples from being damaged by collision, vibration, temperature change and displacement through shock absorption, stable transport box and smooth transportation process, thus ensuring the integrity of the samples and stabilizing their physical and chemical properties, thereby ensuring the accuracy and reliability of subsequent laboratory test results and providing a solid foundation for road quality assessment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a flow chart of the method for sampling and detecting the quality of asphalt concrete pavement of an expressway according to the present invention. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] like Figure 1 As shown, an embodiment of the present invention provides a method for sampling and detecting the quality of an asphalt concrete pavement of an expressway. The specific steps of the method for sampling and detecting the quality of an asphalt concrete pavement of an expressway are as follows: S1: Sampling location selection and on-site testing: Select representative sampling points at different locations on the driving lanes and overtaking lanes of the highway, and then conduct on-site testing; S2: Prepare sampling tools and equipment: Select a suitable road sampling drill for water drilling, prepare a container for holding the sample, and equip with measuring tools; S3: Clean the sampling area: Use cleaning tools to clean the debris, dust and loose particles around the sampling point to ensure that the road surface in the sampling area is clean; S4: Drilling pavement samples: Place the sampling drill at the selected sampling location, adjust the angle and verticality of the drill so that the drill bit is perpendicular to the pavement surface, and then start the laser rangefinder to record the drilling depth; S5: Extract and seal the sample: When the drilling reaches the predetermined depth, stop the drill, carefully pull the sample out of the road surface, and use a clamp with a soft chuck to gently separate the sample from the sampling point; S6: Transport and store samples: Place the packaged samples in a shock-absorbing, stable transport box; S7: Laboratory testing and analysis: According to the requirements of the test items, the samples are tested for various performance indicators.

[0019] The specific steps of sampling location selection and on-site testing in S1 are as follows: Step 1: Data collection and analysis: Collect construction files of the expressway and learn in detail about the design parameters, construction technology, and material specifications of the pavement structure layer; Step 2: Screening of representative sections: Select sections of the highway with typical traffic load characteristics in the driving lanes and overtaking lanes; Step 3: Determine the specific sampling locations: Within the selected representative road section, determine the appropriate sampling interval based on the length of the section. For a 10-kilometer section, set the sampling interval to 1 kilometer. Step 4: Pavement point inspection: Randomly select representative points for core sampling, and conduct indoor tests on indicators such as core sample thickness, porosity, mineral gradation and asphalt content to evaluate the quality of the pavement project.

[0020] The preparation of sampling tools and equipment in S2 refers to preparing a road sampling drill, preparing sealed plastic bags for holding samples, and marking them to prevent sample confusion, and equipping them with measuring tools for accurately measuring the sampling position and sample size.

[0021] Among them, cleaning the sampling area in S3 refers to using a cleaning tool to clean up the debris, dust and loose particles around the sampling point to ensure that the road surface in the sampling area is clean, so as to prevent impurities from mixing into the sample and affecting the accuracy of the test results, and to ensure that the sample taken can truly reflect the original quality condition of the road surface.

[0022] The specific steps of drilling the road surface sample in S4 are as follows: Step 1: Position the drill and adjust the angle: Carefully move the sampling drill to the top of the pre-selected and cleaned sampling point, ensuring that the base of the drill is placed stably on the road surface to avoid shaking or tilting; Step 2: Drilling process control: After completing the positioning and angle adjustment of the drill rig, start the power system of the drill rig and slowly put it into working state. The installation position of the laser rangefinder should ensure that the laser beam it emits can vertically illuminate the sampling point or sampling area. Step 3: Drilling depth monitoring and abnormality handling: Start the laser rangefinder, which calculates the distance by emitting laser pulses and measuring their round-trip time. The total length of the drill tube is reduced by the depth of the drill tube entering the road surface. The laser recorder then calculates the difference between the standard length and the remaining length to get the drilling depth of the road surface. In this process, it processes the measured distance data in the form of a digital signal. The internal microprocessor accurately times the time interval between the emission and reception of the light pulse and calculates the distance value based on the speed of light. The round-trip time of the light pulse is t, and the speed of light is c. The distance ct, this distance value will be converted into a storable digital format and then recorded in the data processor.

[0023] The specific steps of extracting and packaging the sample in S5 are as follows: Step 1: Stop drilling and pull out the drill bit: When the laser rangefinder shows that the drill bit has reached the predetermined drilling depth, immediately operate the control panel of the drill rig to stop the operation of the drill rig smoothly; Step 2: Sample extraction and transfer: Use a clamp with soft chuck to gently separate the sample from the drill bit; Step three: sample packaging and information recording: for the sample put into the container, according to its belonging sampling position and number, select the appropriate sealed plastic bag to make its bag mouth tied tightly, ensure the tightness of packaging, prevent foreign matter, moisture from entering the container to affect the sample quality.

[0024] Among them, the transportation and storage of samples in S6 means that the packaged samples are placed in shock-absorbing and moisture-proof transportation boxes to avoid the influence of collision, vibration and temperature change in the transportation process. During transportation, keep the transportation box stable to prevent the sample from displacement or damage.

[0025] Among them, the specific steps of laboratory detection in S7 are as follows: Step one: appearance inspection: take out the sample, first observe its appearance, including the wrapping condition of asphalt and aggregate, the uniformity of aggregate distribution, whether there is obvious crack or segregation phenomenon, and measure the thickness of core sample to analyze whether the pavement paving thickness meets the requirements; Step two: content determination: centrifugal separation method is used to determine the asphalt content in asphalt concrete sample. Centrifugal separation method is to separate asphalt and aggregate by centrifugal force, calculate the asphalt content by weighing, and analyze the particle composition of mineral aggregate to evaluate the rationality of asphalt mixture grade and whether the asphalt content meets the design requirements; Step three: data analysis: according to the test data and analysis results, write the asphalt pavement coring test report, which should include test purpose, test method, test result and analysis, etc. The test data are sorted and analyzed to obtain the performance index of asphalt pavement, which provides basis for road maintenance, reconstruction and optimization. It should be noted that in this paper, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the term "include", "contain" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0026] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A method for sampling and testing the quality of asphalt concrete pavement on a highway, characterized by: The specific steps of the highway asphalt concrete pavement quality sampling and testing method are as follows: S1: Sampling location selection and on-site testing: Select representative sampling points at different locations on the driving lanes and overtaking lanes of the highway, and then conduct on-site testing; S2: Prepare sampling tools and equipment: Select a suitable road sampling drill for water drilling, prepare a container for holding the sample, and equip with measuring tools; S3: Clean the sampling area: Use cleaning tools to clean the debris, dust and loose particles around the sampling point to ensure that the road surface in the sampling area is clean; S4: Drilling pavement samples: Place the sampling drill at the selected sampling location, adjust the angle and verticality of the drill so that the drill bit is perpendicular to the pavement surface, and then start the laser rangefinder to record the drilling depth; S5: Extract and seal the sample: When the drilling reaches the predetermined depth, stop the drill, carefully pull the sample out of the road surface, and use a clamp with a soft chuck to gently separate the sample from the sampling point; S6: Transport and store samples: Place the packaged samples in a shock-absorbing, stable transport box; S7: Laboratory testing and analysis: According to the requirements of the test items, the samples are tested for various performance indicators.

2. A method for sampling and detecting the quality of an asphalt concrete pavement of an expressway according to claim 1, characterized in that: The specific steps of sampling location selection and on-site testing in S1 are as follows: Step 1: Data collection and analysis: Collect construction files of the expressway and learn in detail about the design parameters, construction technology, and material specifications of the pavement structure layer; Step 2: Screening of representative sections: Select sections of the highway with typical traffic load characteristics in the driving lanes and overtaking lanes; Step 3: Determine the specific sampling locations: Within the selected representative road section, determine the appropriate sampling interval based on the length of the section. For a 10-kilometer section, set the sampling interval to 1 kilometer. Step 4: Pavement point inspection: Randomly select representative points for core sampling, and conduct indoor tests on indicators such as core sample thickness, porosity, mineral gradation and asphalt content to evaluate the quality of the pavement project.

3. The method for sampling and detecting the quality of an asphalt concrete pavement of an expressway according to claim 1, characterized in that: The preparation of sampling tools and equipment in S2 refers to preparing a road sampling drill, preparing sealed plastic bags for holding samples, and marking them to prevent sample confusion, and equipping them with measuring tools for accurately measuring the sampling position and sample size.

4. The method for sampling and detecting the quality of an asphalt concrete pavement of an expressway according to claim 1, wherein: Cleaning the sampling area in S3 refers to using a cleaning tool to clean up the debris, dust and loose particles around the sampling point to ensure that the road surface in the sampling area is clean, so as to prevent impurities from mixing into the sample and affecting the accuracy of the test results, and to ensure that the sample taken can truly reflect the original quality condition of the road surface.

5. The method for sampling and detecting the quality of asphalt concrete pavement of a highway according to claim 1, characterized in that: The specific steps of drilling the road surface sample in S4 are as follows: Step 1: Position the drill and adjust the angle: Carefully move the sampling drill to the top of the pre-selected and cleaned sampling point, ensuring that the base of the drill is placed stably on the road surface to avoid shaking or tilting; Step 2: Drilling process control: After completing the positioning and angle adjustment of the drill rig, start the power system of the drill rig and slowly put it into working state. The installation position of the laser rangefinder should ensure that the laser beam it emits can vertically illuminate the sampling point or sampling area. Step 3: Drilling depth monitoring and abnormality handling: Start the laser rangefinder, which calculates the distance by emitting laser pulses and measuring their round-trip time. The total length of the drill tube is reduced by the depth of the drill tube entering the road surface. The laser recorder then calculates the difference between the standard length and the remaining length to get the drilling depth of the road surface. In this process, it processes the measured distance data in the form of a digital signal. The internal microprocessor accurately times the time interval between the emission and reception of the light pulse and calculates the distance value based on the speed of light. The round-trip time of the light pulse is t, and the speed of light is c. The distance ct, this distance value will be converted into a storable digital format and then recorded in the data processor.

6. The method for sampling and detecting the quality of an asphalt concrete pavement of an expressway according to claim 1, characterized in that: The specific steps of extracting and packaging the sample in S5 are as follows: Step 1: Stop drilling and pull out the drill bit: When the laser rangefinder shows that the drill bit has reached the predetermined drilling depth, immediately operate the control panel of the drill rig to stop the operation of the drill rig smoothly; Step 2: Sample extraction and transfer: Use a clamp with soft chuck to gently separate the sample from the drill bit; Step 3: Sample packaging and information recording: For samples placed in the container, choose a suitable sealed plastic bag according to the sampling position and number, and tie the bag mouth tightly to ensure the tightness of the packaging and prevent external impurities and moisture from entering the container and affecting the quality of the sample.

7. The method for sampling and testing the quality of an asphalt concrete pavement of an expressway according to claim 1, characterized in that: The transport and storage of samples in S6 refers to placing the packaged samples in a shock-absorbing and moisture-proof transport box to avoid being affected by collisions, vibrations and temperature changes during transportation. During transportation, the transport box should be kept stable to prevent the samples from being displaced or damaged.

8. The method for sampling and detecting the quality of an asphalt concrete pavement of an expressway according to claim 1, characterized in that: The specific steps of the laboratory test in S7 are as follows: Step 1: Appearance inspection: Take out the sample and first observe its appearance, including the coverage of asphalt and aggregate, the uniformity of aggregate distribution, and whether there are obvious cracks or segregation. Measure the thickness of the core sample to analyze whether the pavement paving thickness meets the requirements. Step 2: Content determination: The asphalt content in the asphalt concrete sample is determined by centrifugal separation. The centrifugal separation method uses centrifugal force to separate the asphalt from the aggregate. The asphalt content is calculated by weighing and the particle composition of the aggregate is analyzed to evaluate whether the grading rationality of the asphalt mixture and the asphalt dosage meet the design requirements. Step 3: Data Analysis: Based on the test data and analysis results, write an asphalt pavement core sampling test report. The report should include the test purpose, test methods, test results and analysis, and organize and analyze the test data to derive the performance indicators of the asphalt pavement, providing a basis for road maintenance, renovation and optimization.

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