A detection method and evaluation method for a skeleton dense asphalt pavement

Abstract

The present invention relates to a detection method and an evaluation method for a framework dense asphalt pavement. The detection method is to detect the framework dense quality of a single measuring point, including determining the standard density and the actual density; calculating the standard mortar dosage and the actual mortar dosage; calculating the framework density M or the dense framework tightness G. The evaluation method is to evaluate the framework dense quality of a single measuring point, which is: when the actual mortar dosage ≤ the standard mortar dosage, the framework is tight under sufficient compaction, and the framework density is used to evaluate the single-point quality. When M ≥ 98%, the single-point dense quality is evaluated as qualified, otherwise it is unqualified. When the actual mortar dosage > the standard mortar dosage, the mortar is dense under sufficient compaction, and the dense framework tightness is used to evaluate the single-point quality. When G ≥ 98%, the single-point framework tight quality is evaluated as qualified, otherwise it is unqualified. The present invention can scientifically inspect and evaluate the dense quality and framework quality of the framework dense asphalt pavement, making up for the deficiencies and loopholes in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of road engineering quality detection, and more specifically, to a detection method and an evaluation method for a skeleton dense asphalt pavement. Background Art

[0002] With the rapid development of my country's economy, road construction has also developed rapidly for decades and will continue to develop rapidly. Most of the road pavements in my country are asphalt pavements, which are divided into skeleton void structure (asphalt gravel pavement), suspended dense structure (asphalt concrete pavement) and skeleton dense structure (asphalt mastic gravel mixture pavement, i.e. SMA pavement) according to their internal structure. Among them: skeleton void structure has poor durability; suspended dense structure has the worst rutting resistance; skeleton dense structure is dense, and coarse aggregate can form a tight skeleton. It is an ideal pavement structure with excellent durability and rutting resistance. This effect can be achieved in theory and indoor tests. However, due to the differences between engineering practice and theory and indoor tests, differences between different batches of materials, relatively low construction control accuracy, unstable mechanical equipment performance, and material segregation, etc., it is often impossible to make an ideal SMA pavement. In one case, the content of mastic (a mixture of asphalt and fine aggregate, where fine aggregate refers to aggregate with a particle size of ≤2.36mm) is too little, the pavement density is too small, the void ratio is too large, and asphalt macadam pavement is made; in another case, the content of mastic is too much, and the coarse aggregate in the pavement cannot form a skeleton, and asphalt concrete pavement is made. At present, there is a general fear of making SMA pavements in my country. Therefore, it is very necessary to scientifically inspect and evaluate the compaction quality and skeleton quality of SMA pavements, and to scientifically handle the construction, and accurately adjust and control it based on the inspection and evaluation data.

[0003] (JTG F80 / 1-2017) "Highway Engineering Quality Inspection and Assessment Standard" gives the inspection items for SMA pavement and their specified values or allowable errors. Among them, there is an inspection item for compaction quality - compaction degree, and the specified value is ≥98% of the laboratory standard density. There is no inspection item for skeleton quality.

[0004] The above compaction values cannot accurately and comprehensively reflect the compaction quality of SMA pavement, and the skeleton formation has a greater impact on the road performance of SMA pavement. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a skeleton dense asphalt pavement inspection test and evaluation method, the purpose of which is to scientifically inspect and evaluate the compact quality and skeleton quality of the skeleton dense asphalt pavement, and to make up for the shortcomings and loopholes of the existing technology.

[0006] In the present invention, the calculation method for the compaction degree of a single point of a skeleton-dense asphalt pavement is: K = D÷D0×100, where: K——the compaction degree of a single point of the SMA pavement, %; D——the in-situ density of the SMA pavement, referred to as the actual density, t / m 3 ; D0——the maximum density of the asphalt mixture in the laboratory test, referred to as the standard density, t / m 3 . The evaluation of the compaction degree of a single point of the skeleton-dense asphalt pavement is carried out in accordance with the provisions of Appendix E "Evaluation Method for Asphalt Layer Compaction Degree" of "Technical Specifications for Construction of Highway Asphalt Pavements" (JTG F40——2004) and "Quality Inspection and Evaluation Standards for Highway Engineering" (JTG F80 / 1——2017).

[0007] The skeleton density refers to the degree of compaction of the mastic in the SMA pavement when the skeleton is fully compact. It is represented by M. The dense skeleton tightness refers to the degree of tightness of the coarse aggregate forming the skeleton in the SMA pavement when the mastic is fully compact. It is represented by G. The mastic dosage corresponding to the standard density (referring to the dosage per unit volume, the same below) is called the standard mastic dosage, represented by w0, and the mastic dosage corresponding to the actual density is called the actual mastic dosage, represented by w. When the actual mastic dosage ≤ the standard mastic dosage, the compaction degree is characterized by the skeleton density; when the actual mastic dosage > the standard mastic dosage, the compaction degree is characterized by the dense skeleton tightness. Research shows that for the paved stone mastic asphalt (SMA) mixture under full compaction, the density-mastic dosage relationship curve shows a shape that is low at both ends and high in the middle, as Figure 1 shown; the compaction degree / skeleton density / dense skeleton tightness changes synchronously and in the same direction as the density of the pavement; however, the compaction degree cannot accurately reflect the compaction quality of the SMA pavement. When the actual mastic dosage < the standard mastic dosage, the compaction degree is positively correlated with the mastic dosage. In this case, the mastic is not fully compacted and the coarse aggregate forms a tight skeleton. Continuing compaction has no effect, resulting in a large void ratio and a small compaction degree of the SMA pavement. At this time, the compaction degree does not reflect the compaction quality and the tightness of the coarse aggregate forming the skeleton, but only reflects the degree of compaction of the SMA pavement. Therefore, it is more accurate to use the skeleton density to replace the compaction degree to characterize, that is, the skeleton density M = K = D÷D0×100, where: M——the skeleton density of a single point of the SMA pavement, %; the meanings of other symbols are the same as above.

[0008] As the amount of slurry used gradually increases, when the actual amount of slurry used = the standard amount of slurry used, the degree of compaction reaches the maximum value. In this case, while the slurry is fully compacted, the coarse aggregates also form a tight skeleton, indicating the best compaction quality, the largest density, and the highest degree of tightness of the skeleton. It is accurate to characterize this state with the degree of compaction, the density of the skeleton, and the degree of tightness of the dense skeleton, that is, K = M = G = D÷D0×100, where: the meanings of the symbols are the same as above. When the actual amount of slurry used > the optimal amount of slurry used, the degree of compaction is negatively correlated with the amount of slurry used. In this case, the slurry is first fully compacted, but the coarse aggregates cannot completely form a tight skeleton, resulting in the SMA pavement presenting a suspended dense structure with a small degree of compaction. At this time, the degree of compaction does not reflect the compaction quality and density of the SMA pavement, but only reflects the degree of tightness of the skeleton formed by its coarse aggregates. The degree of tightness of the skeleton is negatively correlated with the amount of slurry used. Therefore, it is more accurate to use the degree of tightness of the dense skeleton instead of the degree of compaction to characterize it, that is, the density of the dense skeleton G = K = D÷D0×100, where: G—the degree of tightness of the dense skeleton of a single point on the SMA pavement, %; the meanings of other symbols are the same as above.

[0009] To sum up, when the actual amount of slurry used ≤ the standard amount of slurry used, the degree of compaction is characterized by the density of the skeleton, that is, M = D÷D0×100, where: the meanings of the symbols are the same as above. Therefore, the relationship curve between the degree of compaction and the amount of slurry used at this time becomes the relationship curve between the density of the skeleton and the amount of slurry used, abbreviated as the dense-slurry curve, or M curve; when the actual amount of slurry used > the standard amount of slurry used, the degree of compaction is characterized by the degree of tightness of the dense skeleton, that is, G = D÷D0×100, where: the meanings of the symbols are the same as above. Therefore, the relationship curve between the degree of compaction and the amount of slurry used at this time becomes the relationship curve between the degree of tightness of the dense skeleton and the amount of slurry used, abbreviated as the skeleton-slurry curve, or G curve. As Figure 2 shown.

[0010] It is required that the values of K, M, and G are all ≥ 98%. When M or G ≥ 98%, the skeleton dense quality of a single measurement point on the SMA pavement is evaluated as qualified, otherwise it is evaluated as unqualified.

[0011] To achieve the above object, the technical solution adopted by the present invention is:

[0012] A method for detecting the skeleton dense quality of an asphalt pavement, which is used to detect the skeleton dense quality of a single measurement point, and includes the following steps:

[0013] 1. Determine the standard density and the actual density

[0014] According to the method in (JTG F40 - 2004) "Technical Specifications for Construction of Highway Asphalt Pavements" for the mix design of asphalt mixtures, the standard density is the maximum density of the asphalt mixture obtained through indoor tests during the mix design of the asphalt mixture;

[0015] For the SMA pavement at the construction site, on the third day after rolling is completed, take compacted asphalt mixture specimens by drilling, and measure their density as the actual density. The test method shall be carried out in accordance with (T0706 - 2011) "Test Method for Density of Compacted Asphalt Mixture (Method of Weighing in Water)".

[0016] 2. Calculate the standard mastic dosage and the actual mastic dosage

[0017] The calculation method of the standard mastic dosage is as follows:

[0018] Standard mastic dosage = Standard density × 1m 3 - Mass of coarse aggregate in each cubic meter of dense asphalt mixture, where: The mass of coarse aggregate in each cubic meter of dense asphalt mixture is calculated based on the designed mix ratio of asphalt mixture and the standard density;

[0019] The mix ratio design of asphalt mixture shall be carried out in accordance with Appendix C "Mix Ratio Design Method for SMA Mixture" and Appendix B "Mix Ratio Design Method for Hot Mix Asphalt Mixture" of (JTG F40 - 2004) "Technical Specifications for Construction of Highway Asphalt Pavements", and it has been completed before construction. Therefore, the designed mix ratio and standard density of asphalt mixture are known data;

[0020] The calculation method of the actual mastic dosage is as follows:

[0021] Actual mastic dosage = Actual density × 1m 3 - Mass of coarse aggregate in each cubic meter of pavement, where: The mass of coarse aggregate in each cubic meter of pavement is obtained by dissolving and cleaning the pavement materials with solvent and screening out and weighing the coarse aggregate;

[0022] 3. Calculate the skeleton density M or the dense skeleton tightness G

[0023] When the actual mastic dosage ≤ the standard mastic dosage, calculate the skeleton density M;

[0024] When the actual mastic dosage > the standard mastic dosage, calculate the dense skeleton tightness G.

[0025] A method for evaluating a skeleton dense asphalt pavement, which is to evaluate the skeleton dense quality of a single measuring point. Specifically:

[0026] When the actual mastic dosage ≤ the standard mastic dosage, under the condition of sufficient rolling, the skeleton is tight, and the single-point quality is evaluated by the skeleton density. When M ≥ 98%, the single-point dense quality is evaluated as qualified, otherwise unqualified.

[0027] When the actual mastic dosage > the standard mastic dosage, under the condition of sufficient rolling, the mastic is dense, and the single-point quality is evaluated by the dense skeleton tightness. When G ≥ 98%, the single-point skeleton tight quality is evaluated as qualified, otherwise unqualified.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] 1. The setting and application of indicators are more scientific, reasonable and in line with reality. The compactness is defined as the percentage value of the actual density to the standard density. The prior art uses it to evaluate the compaction quality of asphalt pavements. However, for SMA pavements, in most cases, it does not reflect the compaction degree of the pavement. When the actual asphalt mortar dosage is less than the standard asphalt mortar dosage, it does not reflect the compaction degree of the pavement, but reflects the density degree of the pavement. Although sufficient rolling has been carried out and the skeleton formed by coarse aggregates is already tight, the density cannot reach the maximum; when the actual asphalt mortar dosage is equal to the standard asphalt mortar dosage, it reflects both the compaction degree and the density degree of the pavement, and also reflects the tightness degree of the skeleton formed by coarse aggregates of the pavement; when the actual asphalt mortar dosage is greater than the standard asphalt mortar dosage, it neither reflects the compaction degree nor the density degree of the pavement, but reflects the tightness degree of the skeleton formed by coarse aggregates of the pavement. Although sufficient rolling has been carried out and the asphalt mortar is already dense, the tightness degree of the skeleton cannot reach the tightest. Therefore, when the actual asphalt mortar dosage is not greater than the standard asphalt mortar dosage, the quality of the SMA pavement is characterized by the skeleton density index. At this time, it is easy for coarse aggregates to form a tight skeleton, and the density is the short board. Therefore, the key is to check and evaluate the density of the asphalt mortar; when the actual asphalt mortar dosage is greater than the standard asphalt mortar dosage, the quality of the SMA pavement is characterized by the dense skeleton tightness index. At this time, the pavement is easily compacted, and the tightness degree of the skeleton is the short board. Therefore, the key is to check and evaluate the tightness degree.

[0030] 2. It is more convenient to guide the construction. Under the conditions of the prior art, when using the compactness to check and evaluate the construction quality, when the compactness is unqualified, it is difficult to find the reason. It is not clear whether it is caused by insufficient rolling, or due to excessive asphalt mortar dosage, or due to too little asphalt mortar dosage, and it cannot indicate the direction of construction correction. The particularity of the SMA pavement is that it requires both the pavement to be dense and the skeleton formed by coarse aggregates to be tight. The present invention distinguishes different situations and respectively uses the skeleton density and the dense skeleton tightness for inspection and evaluation, with strong pertinence and hitting the key point. At the same time, if the quality is unqualified, it can directly show whether the density of the asphalt mortar is poor or the tightness degree of the skeleton is poor, which is convenient for finding out the reason and conducive to formulating a correction plan.

[0031] 3. The present invention is also applicable to the detection tests and evaluations of other skeleton dense pavements (such as skeleton dense cement stabilized macadam bases, etc.). BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the density - asphalt mortar dosage relationship.

[0033] Figure 2It is a schematic diagram of the relationship between compaction degree and mastic dosage, or can be called a schematic diagram of the M / G - mastic dosage relationship. Specific implementation mode

[0034] The technical solutions and effects of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0035] Example 1

[0036] Known conditions of the example: According to the method in (JTG F40 - 2004) "Technical Specifications for Construction of Highway Asphalt Pavements", the mix proportion design of asphalt mixture is carried out, and it is obtained that: the standard density D0 of SMA - 20 pavement is 2.36 t / m 3 , and the mass of coarse aggregate in each cubic meter of dense asphalt mixture is 2.006 t. Then: standard mastic dosage = standard density × 1 m 3 - the mass of coarse aggregate in each cubic meter of dense asphalt mixture = 2.36 t / m 3 ×1 m 3 - 2.006 t = 0.354 t, and it is detected and evaluated that the pavement has been fully compacted.

[0037] Measuring point I

[0038] A detection test and evaluation method for a framework - dense asphalt pavement, the specific method is as follows:

[0039] 1. Determine the actual density

[0040] According to the test method in (T0706 - 2011) "Density Test of Compacted Asphalt Mixture (Water Immersion Method)", drill cores of the SMA pavement at the construction site on the third day after rolling to obtain compacted asphalt mixture specimens, and measure their density to be 2.30 t / m 3 , which is the actual density D.

[0041] 2. Calculate the actual mastic dosage

[0042] Use diesel to dissolve and clean the pavement materials and make the diesel completely volatilize, screen out the coarse aggregate, weigh it and calculate: the mass of coarse aggregate in each cubic meter of pavement is 1.978 t. Then: actual mastic dosage = actual density × 1 m 3 - the mass of coarse aggregate in each cubic meter of pavement = 2.30 t / m 3 ×1 m 3 - 1.978 t = 0.322 t.

[0043] 3. Calculate the framework density M or the dense framework tightness G

[0044] The actual mastic dosage = 0.322 t < the standard mastic dosage = 0.354 t, then calculate the framework density M.

[0045] M = K = D÷D0×100 = 2.30÷2.36×100 = 97.5%

[0046] 4. Evaluate the single - point skeleton density quality

[0047] M = 97.5% < 98%, the skeleton of measuring point I is tight, and the evaluation of the mastic density quality is unqualified.

[0048] Measuring point II

[0049] A detection test and evaluation method for a skeleton - dense asphalt pavement. The specific method is as follows:

[0050] 1. Determine the actual density

[0051] According to the test method of (T0706 - 2011) "Density Test of Compacted Asphalt Mixture (Water Immersion Method)", drill cores of the SMA pavement at the construction site on the third day after rolling to obtain compacted asphalt mixture specimens, and measure its density as 2.33 t / m 3 , which is the actual density D.

[0052] 2. Calculate the actual mastic dosage

[0053] Dissolve and clean the pavement materials with diesel and let the diesel volatilize completely. Screen out the coarse aggregates, weigh them and calculate: The mass of coarse aggregates per cubic meter of pavement is 1.99 t. Then: The actual mastic dosage = actual density × 1 m 3 - The mass of coarse aggregates per cubic meter of pavement = 2.33 t / m 3 × 1 m 3 - 1.99 t = 0.34 t.

[0054] 3. Calculate the skeleton density M or the dense - skeleton tightness G

[0055] The actual mastic dosage = 0.34 t < the standard mastic dosage = 0.354 t, then calculate the skeleton density M.

[0056] M = K = D÷D0×100 = 2.35÷2.36×100 = 99.6%

[0057] 4. Evaluate the single - point skeleton density quality

[0058] M = 99.6% > 98%, the skeleton of measuring point II is tight, and the evaluation of the mastic density quality is qualified.

[0059] Measuring point III

[0060] A detection test and evaluation method for a skeleton - dense asphalt pavement. The specific method is as follows:

[0061] 1. Determine the actual density

[0062] According to the test method of (T0706 - 2011) "Density Test of Compacted Asphalt Mixture (Water Immersion Method)", core samples of compacted asphalt mixture were taken from the SMA pavement at the construction site on the third day after rolling, and its density was measured as 2.32 t / m 3 , which is the actual density D.

[0063] 2. Calculate the actual amount of mastic

[0064] Dissolve and clean the pavement materials with diesel and let the diesel volatilize completely. Screen out the coarse aggregates, weigh them and calculate: the mass of coarse aggregates per cubic meter of pavement is 1.95 t. Then: the actual amount of mastic = actual density × 1 m 3 - the mass of coarse aggregates per cubic meter of pavement = 2.32 t / m 3 ×1 m 3 - 1.95 t = 0.37 t.

[0065] 3. Calculate the skeleton density M or the dense skeleton tightness G

[0066] The actual amount of mastic = 0.37 t > the standard amount of mastic = 0.354 t, then calculate the dense skeleton tightness G.

[0067] G = D÷D0×100 = 2.32÷2.36×100 = 98.3%

[0068] 4. Evaluate the single - point skeleton density quality

[0069] G = 98.3% > 98%, the mastic of measuring point III is dense, and the skeleton tightness quality is evaluated as qualified.

[0070] Measuring point IV

[0071] A method for testing and evaluating a dense - skeleton type asphalt pavement, the specific method is as follows:

[0072] 1. Determine the actual density

[0073] According to the test method of (T0706 - 2011) "Density Test of Compacted Asphalt Mixture (Water Immersion Method)", core samples of compacted asphalt mixture were taken from the SMA pavement at the construction site on the third day after rolling, and its density was measured as 2.31 t / m 3 , which is the actual density D.

[0074] 2. Calculate the actual amount of mastic

[0075] Dissolve and clean the pavement materials with diesel and let the diesel volatilize completely. Screen out the coarse aggregates, weigh them and calculate: the mass of coarse aggregates per cubic meter of pavement is 1.93 t. Then: the actual amount of mastic = actual density × 1 m 3- Mass of coarse aggregate per cubic meter of pavement = 2.31 t / m 3 × 1 m 3 - 1.93 t = 0.38 t.

[0076] 3. Calculate the skeleton density M or the dense skeleton tightness G

[0077] Actual amount of mastic used = 0.38 t > Standard amount of mastic used = 0.354 t, so calculate the dense skeleton tightness G.

[0078] G = D ÷ D0 × 100 = 2.31 ÷ 2.36 × 100 = 97.9%

[0079] 4. Evaluate the single-point skeleton dense quality

[0080] G = 97.9% < 98%, the mastic at measuring point IV is dense, and the evaluation of the skeleton tightness quality is unqualified.

[0081] In engineering practice, according to the test results and evaluation, measures should be taken to change the unqualified to qualified or improve the quality. The treatment methods for measuring points I to IV are as follows:

[0082] For the situation of unqualified dense quality at measuring point I due to less mastic used, the treatment measure is: increase the amount of mastic to reach the state of measuring point II;

[0083] The situation of measuring point II is that the skeleton is tight and the mastic is dense, which is an ideal quality state;

[0084] For the situation of measuring point III, although it is evaluated as qualified, there is still room for the skeleton to be further tightened and it has not reached the tightest. The measure to be taken is: increase the tonnage of the roller and roll again to make the skeleton the tightest;

[0085] For the situation of unqualified skeleton tightness quality at measuring point IV due to more mastic used, the treatment measure is: reduce the amount of mastic to reach the state of measuring point II.

[0086] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A detection method for a framework dense asphalt pavement, characterized in that This method is for detecting the skeleton dense quality of a single measuring point, including the following steps:

1. Determine the standard density and the actual density According to the method in JTG F40 - 2004 Technical Specifications for Construction of Highway Asphalt Pavements, conduct the mix design of asphalt mixture. The standard density is the maximum density of the asphalt mixture obtained through laboratory tests during the mix design of the asphalt mixture; For the SMA pavement at the construction site, on the third day after rolling is completed, drill holes to obtain compacted asphalt mixture specimens and measure their density as the actual density. The test method is carried out in accordance with T0706 - 2011 Test Methods for Density of Compacted Asphalt Mixture (Weight-in-Water Method); 2. Calculate the standard mastic dosage and the actual mastic dosage The calculation method of the standard mastic dosage is as follows: Standard mortar dosage = Standard density × 1m 3 - Mass of coarse aggregate in per cubic meter of dense asphalt mixture, where: The mass of coarse aggregate in per cubic meter of dense asphalt mixture is calculated based on the design mix ratio and standard density of the asphalt mixture; The mix design of asphalt mixture should be carried out in accordance with the mix design method of SMA mixture in Appendix C and the mix design method of hot mix asphalt mixture in Appendix B of JTG F40 - 2004 Technical Specifications for Construction of Highway Asphalt Pavements, and it has been completed before construction. Therefore, the designed mix ratio and standard density of the asphalt mixture are known data; The calculation method of the actual mastic dosage is as follows: Actual amount of putty used = actual density × 1m 3 - Mass of coarse aggregate in each cubic meter of road surface. In the formula: The mass of coarse aggregate in each cubic meter of road surface is obtained by dissolving and cleaning the road surface materials with solvent, screening out the coarse aggregate and weighing it; 3. Calculate the skeleton density M or the dense skeleton tightness G When the actual amount of mastic used < the standard amount of mastic used, the degree of compaction is positively correlated with the amount of mastic used. In this case, the mastic is not fully compacted and the coarse aggregates form a tight skeleton. Continuing to roll has no effect, resulting in a relatively large void ratio and a relatively small degree of compaction in the SMA pavement. At this time, the degree of compaction does not reflect the compaction quality and the tightness of the skeleton formed by the coarse aggregates, but only reflects the density of the SMA pavement. Therefore, it is more accurate to use the skeleton density to represent it, that is, the skeleton density M = K = D÷D0×100, where: M——the skeleton density of a single point on the SMA pavement, %; K——the degree of compaction of a single point on the SMA pavement, %; D——the in-situ density of the SMA pavement, called the actual density, t / m 3 ; D0——the maximum density of the asphalt mixture in the laboratory test, called the standard density, t / m 3 ; As the amount of mastic used gradually increases, when the actual amount of mastic used = the standard amount of mastic used, the degree of compaction reaches the maximum value. In this case, while the mastic is fully compacted, the coarse aggregates also form a tight skeleton, indicating the best compaction quality, the largest density, and the highest tightness of the skeleton. It is accurate to use the degree of compaction, the skeleton density, and the dense-skeleton tightness to represent this state, that is, K = M = G = D÷D0×100, where: K——the degree of compaction of a single point on the SMA pavement, %; M——the skeleton density of a single point on the SMA pavement, %; G——the dense-skeleton tightness of a single point on the SMA pavement, %; D——the in-situ density of the SMA pavement, called the actual density, t / m 3 ; D0——the maximum density of the asphalt mixture in the laboratory test, called the standard density, t / m 3 ; Therefore, when the actual amount of mastic used ≤ the standard amount of mastic used, calculate the skeleton density M to reflect the compaction quality and the tightness of the skeleton formed by the coarse aggregates; When the actual amount of mastic used > the standard amount of mastic used, the compactness is negatively correlated with the amount of mastic. In this case, the mastic is first fully compacted, but the coarse aggregates cannot yet form a completely tight skeleton, resulting in the SMA pavement presenting a suspension-dense structure with a relatively small compactness. At this time, the compactness does not reflect the compaction quality and density of the SMA pavement, but only reflects the tightness of the skeleton formed by its coarse aggregates. The tightness of the skeleton is negatively correlated with the amount of mastic. Therefore, it is more accurate to use the dense-skeleton tightness to characterize it, that is, the dense-skeleton degree G = K = D÷D0×100, where: G—the dense-skeleton tightness of a single point on the SMA pavement, %; K—the compactness of a single point on the SMA pavement, %; D—the in-situ density of the SMA pavement, called the actual density, t / m 3 ; D0—the maximum density of the asphalt mixture in the laboratory test, called the standard density, t / m 3 ; Therefore, when the actual amount of mastic used > the standard amount of mastic used, calculate the dense-skeleton tightness G to reflect the compaction quality and density of the SMA pavement.

2. The inspection method for a framework dense asphalt pavement according to claim 1, characterized in that The method for evaluating the skeleton dense quality of a single measuring point using the skeleton density M and the dense skeleton tightness G obtained by the said detection method is specifically as follows: When the actual mastic dosage ≤ the standard mastic dosage, the skeleton is tight under sufficient rolling. Use the skeleton density to evaluate the single-point quality. When M ≥ 98%, the single-point dense quality is evaluated as qualified, otherwise it is unqualified; When the actual mastic dosage > the standard mastic dosage, the mastic is dense under sufficient rolling. Use the dense skeleton tightness to evaluate the single-point quality. When G ≥ 98%, the single-point skeleton tight quality is evaluated as qualified, otherwise it is unqualified.

Images