CN110674592B - Application of pavement maintenance seal material - Google Patents
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- CN110674592B CN110674592B CN201910953356.XA CN201910953356A CN110674592B CN 110674592 B CN110674592 B CN 110674592B CN 201910953356 A CN201910953356 A CN 201910953356A CN 110674592 B CN110674592 B CN 110674592B
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- 239000000463 material Substances 0.000 title claims abstract description 48
- 238000012423 maintenance Methods 0.000 title claims abstract description 20
- 238000012360 testing method Methods 0.000 claims abstract description 72
- 238000005299 abrasion Methods 0.000 claims abstract description 57
- 239000010426 asphalt Substances 0.000 claims abstract description 33
- 239000004568 cement Substances 0.000 claims abstract description 31
- 238000010276 construction Methods 0.000 claims abstract description 24
- 238000007789 sealing Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000005516 engineering process Methods 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims abstract description 9
- 239000004576 sand Substances 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 239000004575 stone Substances 0.000 claims description 15
- 238000012937 correction Methods 0.000 claims description 13
- 238000013461 design Methods 0.000 claims description 12
- 239000003292 glue Substances 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 6
- 239000000839 emulsion Substances 0.000 claims description 6
- 239000011800 void material Substances 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 238000007620 mathematical function Methods 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 19
- 230000003449 preventive effect Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000007586 pull-out test Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16C—COMPUTATIONAL CHEMISTRY; CHEMOINFORMATICS; COMPUTATIONAL MATERIALS SCIENCE
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Abstract
The invention discloses an application of a pavement maintenance seal material, which comprises the following steps: firstly, manufacturing a plurality of asphalt pavement test pieces and cement pavement test pieces with different grades; secondly, paving a sealing layer on the test piece; thirdly, measuring the bonding strength and the abrasion value of a sealing layer of the test piece; and fourthly, establishing a relation model between the pavement structure depth and the seal bonding strength and abrasion value, and determining the optimal structure depth range of the asphalt pavement and the cement pavement. According to the invention, by means of an image processing technology, a relation model between the gravel coverage and the gravel equivalent is obtained, and the material consumption of the embedded sand fog seal is designed by combining an McLeod method; the defect that the material dosage is determined by experience in the current pavement maintenance construction is overcome.
Description
Technical Field
The invention relates to application of a pavement maintenance seal material and determination of an optimal range of a pavement maintenance texture structure based on a design method, and belongs to the technical field of pavement preventive maintenance.
Background
Along with the increase of the service time of the road surface, long-term vehicle load can generate polishing effect on the road surface, so that the skid resistance of the road surface is reduced, and the potential traffic safety hazard is formed. Therefore, it is necessary to restore the road surface function and perform preventive maintenance. In the research of the pavement preventive maintenance technology, the proportion design is generally carried out only from the sealing material, and the influence of the original pavement surface structure on the application effect is not considered; in the process of preventive maintenance construction, the material dosage is usually determined by engineering experience. Therefore, a reasonable design method for curing seal materials is needed, and the optimal original pavement texture condition implemented by the curing technology is defined. The rubble coverage rate is an important index in rubble seal construction, generally 80-90%, and for a seal adopting rubbles with single particle size of 2.36-4.75 mm, when the rubble coverage rate is 110-150%, the construction depth after the seal is implemented is influenced by the original pavement texture. By means of an MATLAB image processing technology, a relation model between the crushed stone using amount and the crushed stone coverage rate can be obtained, and the maintenance seal material is designed by using the crushed stone coverage rate index. Meanwhile, the optimal pavement texture condition for preventive maintenance can be analyzed from the perspective of the bond strength and the abrasion value index according to the pull test and the abrasion test. Therefore, how to obtain a reasonable maintenance seal material design method by means of image processing to determine the optimal structural depth range of the pavement is the key point of the current research of the inventor.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems and the defects in the prior art, the invention utilizes the image processing technology to calculate the coverage rate and the dosage of the crushed stone so as to assist the design of the seal material; and establishing a relation model between the bonding strength and the abrasion value of the embedded sealing layer and the pavement construction depth, determining the optimal construction depth range of the pavement to be maintained when the embedded sealing layer is implemented, and providing theoretical basis and guidance for the original pavement treatment of pavement maintenance construction.
The technical scheme is as follows: the application of the pavement maintenance seal material is characterized by comprising the following steps:
firstly, manufacturing a plurality of asphalt pavement test pieces and cement pavement test pieces with different grades;
secondly, paving a sealing layer material on the test piece;
thirdly, measuring the bonding strength and the abrasion value of a sealing layer of the test piece;
and fourthly, establishing a relation model between the pavement structure depth and the seal bonding strength and abrasion value, and determining the optimal structure depth range of the asphalt pavement and the cement pavement.
Further preferred according to the invention are: in the first step, two groups of asphalt rut plate test pieces with 7 grades of AC-13 and AC-16 are respectively manufactured, and the structural depth variation range is 0.67-1.62 mm; and manufacturing the concrete plates with the size and the specification of the rutting plate, and grooving, wherein the equivalent structure depth range is 0.25-1.27 mm, and the total number is 7.
The invention further defines the technical scheme as follows: in the second step, the base coating emulsion and the upper layer emulsion on the asphalt pavement test piece and the cement pavement test piece are 65% and 35% of the cementing material respectively.
The invention further defines the technical scheme as follows: the third step comprises a drawing test and an abrasion test;
the drawing test comprises the following steps:
3.1, adopting a bonding pull head with the size of 45mm multiplied by 45mm, using epoxy resin AB glue strong glue to bond the bonding pull head on the cured seal test piece, and curing at the room temperature of 25 ℃ for 24 hours;
3.2, vertically cutting the test piece along the edge of the bonding pull head by using an angle grinder, wherein the cutting depth is suitable for exposing the material of the bottom plate test piece, so that the bottom plate test piece is separated from the surrounding bonding glue, and the drawing stress range is ensured to be equal to the size of the bonding pull head; connecting the bonding pull head to a drawing instrument, performing a drawing test, and recording a strength peak value;
the abrasion test procedure was as follows: after the embedded sand fog seal layer is paved, the test piece is maintained outdoors for 7 days at 25 ℃, and an accelerated loading abrasion tester is adopted for abrasion test; recording the abrasion value under each level of abrasion frequency, as shown in a formula (1), wherein when the abrasion frequency is 60k times, the abrasion value is reduced and slowly enters a stable stage;
in the formula: gc-specific abrasion per unit area (%);
m 1-original mass (kg) of test piece;
m 2-mass (kg) of test piece after abrasion;
ms-mass (kg) of broken stones scattered in the abrasion range;
ml-mass (kg) of cement scattered in the abrasion range.
The invention further defines the technical scheme as follows: in the fourth step, a mathematical function model between the sealing layer bonding strength and 60k times corresponding abrasion value of the asphalt pavement and the cement pavement and the construction depth of the original pavement test piece is established, as shown in formulas (2) to (5):
ybonding of＝-0.3917x2+1.3881x +0.3765 (asphalt pavement) (2)
yBonding of＝-0.7337x2+1.7484x +1.1755 (cement pavement) (3)
yWear and tear＝5.2691x2-17.752x +38.265 (asphalt pavement) (4)
yWear and tear＝2.6972x2-9.7713x +33.882 (cement road surface) (5)
In the formula: y bond-tensile strength (MPa);
y abrasion — abrasion value (%);
x-corresponding to the original pavement structure depth (mm).
The invention is further defined by the following technical characteristics: the optimal construction depth ranges of the asphalt pavement and the cement pavement are respectively 1.0-1.8 mm and 1.0-1.4 mm.
The invention further defines the technical scheme as follows: the design of the seal material comprises the following steps:
step S1, determining the equivalent of the coverage rate of the seal coat gravels and the using amount of the gravels, and determining a relation model of the coverage rate of the gravels and the using amount of the gravels;
and step S2, designing a seal material, and calculating the use amount of the seal aggregate and the cementing material.
The invention further defines the technical scheme as follows: in step S1, the method includes the following steps:
step S11, defining a black background area of 200mm by 200mm, respectively spreading two basalt macadams with single grain diameter of 2.36 mm-4.75 mm and determined quality, and collecting images;
step S12, generating a binary image after denoising the image by using an image processing technology, and counting the ratio of the rubble coverage area to obtain a relation model of the rubble coverage and the rubble usage, as shown in formula (6):
y＝0.0544x (6)
in the formula: y-amount of crushed stone (kg/m)2)；
x-rubble coverage (%).
The invention further defines the technical scheme as follows: in the step S2, the amount of the seal aggregate is determined by using Mcleod method, and the amount C is calculated by formula (7) to formula (9):
C＝(1-0.4×V)×H×G×E (7)
H＝M/(1.139285+0.011506×FI) (8)
in the formula: g-aggregate density, determination of G-2.575 t/m3；
V is the void ratio of the loose aggregate, the void ratio is measured to be 0.13 by adopting the aggregate with single particle size of 2.36-4.75 mm;
m-theoretical median aggregate size, (2.36+ 4.75)/2-3.555;
FI is aggregate flake index, is not more than 5 percent, and the test value is 5 percent;
h, calculating the average height of the crushed stones to be 3.1048 mm;
e, aggregate loss rate, wherein aggregate loss is inevitable after the gravel seal is put into use, and 10 percent of aggregate loss is taken into consideration when the design is carried out, wherein 5 to 10 percent of aggregate loss is taken;
in conclusion, the optimal crushed stone dosage C of the TICS seal theory can be obtained to be 6.8kg/m2Coverage is 124%;
the cement amount is determined by equation (9):
B＝(0.4×H×T×V+S+A)/R (9)
in the formula: t is traffic volume correction factor; s-road condition correction factor; a is an aggregate absorption correction index, and if the surface performance of the original pavement layer has no great loss, 0 is taken; r is the effective content of the cementing material, the undiluted cementing material is 1, and the solid content of the emulsified asphalt is 0.558; H. and V is a calculation process value of formulas (7) to (8).
Has the advantages that: compared with the prior art, the method has the advantages that by means of an image processing technology, a relation model between the gravel coverage and the gravel equivalent is obtained, and the material consumption of the embedded sand fog seal layer is designed by combining an McLeod method; the defect that the material dosage is determined by experience in the current pavement maintenance construction is overcome. In addition, a drawing test and a wear test are carried out on the simulated road surface subjected to the sealing, a relation model between the bonding strength and the wear index and the road surface structure depth is established, the optimal road surface structure depth range for implementing the sealing technology from the aspects of bonding performance and wear resistance is obtained, and technical guidance can be carried out on the processing requirement of the original road surface during maintenance construction.
Drawings
FIG. 1 is a binary image corresponding to two types of rock breaking quality images.
FIG. 2 shows the structure of a built-in sand fog seal.
FIG. 3 is a drawing test chart.
FIG. 4 is a graph showing the wear test.
Fig. 5 is a graph of bond strength versus pavement structure depth.
Fig. 6 is a graph of wear value versus road surface structure depth for 60k wear cycles.
Detailed Description
Example 1
The invention is further elucidated with reference to the drawings and the embodiments.
As shown in fig. 1-6, the present embodiment provides a design and application of a sand-embedded fog sealing material, and determines the optimal pavement structure depth range for implementing the sealing technology, and the present embodiment at least comprises the following steps:
firstly, determining the equivalent gravel usage of the seal coat gravel coverage rate
A black background area of 200mm multiplied by 200mm is defined, two basalt macadams with single grain diameter of 2.36 mm-4.75 mm and determined quality are respectively scattered, the defined area is not filled with the macadams, and images are collected. And (3) denoising the image by using an image processing technology to generate a binary image, and counting the ratio of the rubble coverage area to obtain a relation model of the rubble coverage and the rubble consumption, as shown in a formula 6.
y＝0.0544x (6)
In the formula: y-amount of crushed stone, kg/m2；
x-rubble coverage,%;
the rubble coverage rate is an important index in rubble seal construction, generally 80-90%, for a seal adopting rubbles with single particle size of 2.36-4.75 mm, when the rubble coverage rate is 110-150%, the structural depth after the seal is implemented is influenced by the original pavement texture, and the pavement seal mostly takes single-layer rubble coverage as the final construction target, considering the initial abrasion after road maintenance, the rubble coverage rate is preferably 110-150%.
Second step, seal material design
Calculating the using amounts of the seal aggregate and the cementing material by referring to an McLeod method for the seal material;
2.1 amount of aggregate
According to the McLeod method, the aggregate dosage C is determined by calculation according to the formula 7-8:
C＝(1-0.4×V)×H×G×E (7)
H＝M/(1.139285+0.011506×FI) (8)
in the formula: g-aggregate density, determination of G-2.575 t/m3；
V is the void ratio of the loose aggregate, the void ratio is measured to be 0.13 by adopting 2.36-4.75 mm single-particle-size aggregate;
m-theoretical median aggregate size, (2.36+ 4.75)/2-3.555;
FI-aggregate sheet index, should not be greater than 5%, test value is 5%;
h, calculating the average height of the crushed stones to be 3.1048 mm;
e, aggregate loss rate, the aggregate loss can not be avoided after the gravel seal is put into use, and 5% -10% of the aggregate loss is considered in the design, namely 10%.
The optimal crushed stone dosage C of the TICS seal theory can be obtained by calculation in a conclusion manner, and is 6.8kg/m2The coverage was 124%.
2.2 amount of cementing agent
The amount of cement used is determined by equation 9:
B＝(0.4×H×T×V+S+A)/R (9)
in the formula: and T is a traffic volume correction factor, according to practical experience, Mcleod provides that if the traffic volume is small, the needed cementing material dosage is relatively large, and if the traffic volume is large, the dosage is relatively small. Under different traffic flow conditions, the dosage and traffic volume correction factors of the cementing material of the gravel sealing layer are shown in the table 1. In this example, the water-based epoxy emulsified asphalt was used as a binder, and the cured form was stable without correcting the traffic volume, where T is 1.
S is a pavement condition correction factor, and the pavement condition is also an important factor influencing the dosage of the cementing material of the gravel sealing layer. Smooth roads with few cracks and small pores and less absorbed cementing materials; dry, cracked, pitted pavements can absorb large amounts of cementitious materials. The partial road surface condition usage correction factor is shown in table 2. The TICS takes a road with good road surface structure condition, slight cracks, pits and oxidation on the surface as a main application object, and takes 0.21 as the main application object.
And A is an aggregate absorption correction index, and if the surface performance of the original pavement layer is not greatly lost, 0 is taken.
R is the effective content of the cementing material, the undiluted cementing material is 1, and the solid content of the emulsified asphalt is 0.558.
H. The value of V is shown in the calculation process of formulas 2-3.
TABLE 1 amount of Binder traffic correction factor
TABLE 2 pavement condition correction factor for amount of cement
In conclusion, the amount of the cementing agent can be calculated to be 1.8kg/m2。
According to the calculation, the aggregate dosage can be 6.8kg/m2The dosage of the cementing material is 1.8kg/m2Used as the reference amount of the seal material.
Third, manufacturing a test piece
Respectively manufacturing two groups of 7 grading asphalt rut plate test pieces of AC-13 and AC-16, wherein the range of structural depth variation is 0.67-1.62 mm; and 7 groups of concrete plates with the specifications of the track plates and grooving, wherein the equivalent structure depth range is 0.25-1.27 mm.
Fourthly, paving a sealing layer
The application of the embedded sand fog seal layer on the asphalt pavement and the cement pavement is slightly different, and the embedded sand fog seal layer is specifically carried out according to the scheme shown in figure 2, wherein the bottom coating emulsion and the upper layer emulsion are 65 percent and 35 percent of the cementing material respectively;
fifthly, measuring the bonding strength and the abrasion value of the sealing layer
5.1 th drawing test
Step 5.1.1, adopting a bonding pull head with the size of 45mm multiplied by 45mm, using epoxy resin AB glue strong glue to bond the bonding pull head on the cured seal test piece, and curing for 24 hours at the room temperature of 25 ℃;
step 5.1.2, adopting a manual speed control drawing instrument, wherein the test method comprises the following steps: firstly, vertically cutting along the edge of a bonding pull head on a test piece by using an angle grinder, wherein the cutting depth is suitable for exposing a bottom plate test piece material, so that the bottom plate test piece material is separated from the surrounding bonding glue, and the drawing stress range is ensured to be equal to the size of the bonding pull head; the bonding slider was attached to a puller, a pull-out test was performed, and the peak intensity value was recorded.
5.2 abrasion test
After the embedded sand fog seal layer is paved, the test piece is maintained outdoors at 25 ℃ for 7d, and an accelerated loading abrasion tester is adopted to carry out abrasion test under the test conditions of 2.28kN applied load, 0.7MPa of tire pressure and 25 ℃. The wear values at each stage of wear number were recorded (as in equation 1), where at 60k wear number, the wear value dropped slowly into the plateau.
In the formula: gc-specific abrasion per unit area,%;
m1-original mass of the test piece, kg;
m2mass kg of the test piece after abrasion;
msspreading the mass of the crushed stones in kg within the abrasion range;
mlthe mass of the cementing material, kg, is spread within the abrasion range.
Sixthly, establishing a relation model between the pavement structure depth and the seal bonding strength and abrasion value
Establishing a mathematical function model between the bonding strength of the upper sealing layers of the asphalt pavement and the cement pavement, the 60k times corresponding abrasion value and the construction depth of the original pavement test piece, as shown in formulas 2-5:
ybonding of＝-0.3917x2+1.3881x +0.3765 (asphalt pavement) (2)
yBonding of＝-0.7337x2+1.7484x +1.1755 (cement pavement) (3)
yWear and tear＝5.2691x2-17.752x +38.265 (asphalt pavement) (4)
yWear and tear＝2.6972x2-9.7713x +33.882 (cement road surface) (5)
In the formula: y isBonding of-drawing strength, MPa;
ywear and tear-abrasion value,%;
x is the depth of the corresponding original pavement structure, mm.
From the point of view of bond strength. For asphalt pavement, the TICS seal has a maximum bond strength of 1.6063MPa when x is 1.772 mm; for cement pavements, when x is 1.192mm, the seal has a maximum bond strength of 2.2171 MPa. Therefore, in practical application, the road surface should be roughened to make the structure depth as close as possible to the maximum drawing strength corresponding value, and the asphalt road surface structure depth is recommended to be controlled to be 1.0 mm-1.9 mm, and the cement road surface structure depth is recommended to be controlled to be 0.8 mm-1.4 mm.
From the point of view of abrasion resistance. When the construction depth on the asphalt pavement is 1.685mm, the corresponding abrasion value is 23.3 percent, which is the minimum; when the structural depth on the cement road surface was 1.811mm, the abrasion value was 25.0% corresponding to the minimum abrasion value. Assuming that the TICS abrasion will not be affected by the road surface construction depth at the asphalt road surface and cement road surface construction depths of more than 1.685mm and 1.811mm, the abrasion values are 23.3% and 25.0%. In practice, asphalt and cement road pavement construction depths are typically less than 1.685mm and 1.811mm, and therefore fitting equations may be used to evaluate the wear resistance of corresponding road surfaces using TICS. In combination with test data, the wear values should be low, and the construction depths of asphalt pavements and cement pavements are recommended to be in the ranges of 0.8mm to 1.8mm and 1.0mm to 1.8 mm. The corresponding relation between the test piece type and the construction depth is as follows:
surface structure depth of asphalt rut
Grooving (interval 15mm) and construction depth of cement board test piece
And combining the results of the drawing test and the abrasion test, and finally obtaining the comprehensive recommended optimal structural depth ranges of the asphalt pavement and the cement pavement which are respectively 1.0-1.8 mm and 1.0-1.4 mm. The structural depth range can provide guidance for the pretreatment of the pavement before pavement maintenance construction.
The foregoing is only a preferred embodiment of this invention and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the invention and these modifications should also be considered as the protection scope of the invention.
Claims (1)
1. The application of the pavement maintenance seal material comprises the following steps: firstly, manufacturing a plurality of asphalt pavement test pieces and cement pavement test pieces with different grades; in the first step, two groups of asphalt rut plate test pieces with 7 grades of AC-13 and AC-16 are respectively manufactured, and the structural depth variation range is 0.67-1.62 mm; manufacturing the concrete plates with the specifications of the rutting plate, and grooving, wherein the equivalent structure depth range is 0.25-1.27 mm, and the total number is 7; secondly, paving a sealing layer material on the test piece; in the second step, the base coating emulsion and the upper layer emulsion on the asphalt pavement test piece and the cement pavement test piece are 65% and 35% of the cementing material respectively; thirdly, measuring the bonding strength and the abrasion value of a sealing layer of the test piece; the third step comprises a drawing test and an abrasion test; the drawing test comprises the following steps: 3.1, adopting a bonding pull head with the size of 45mm multiplied by 45mm, using epoxy resin AB glue strong glue to bond the bonding pull head on the cured seal test piece, and curing at the room temperature of 25 ℃ for 24 hours; 3.2, vertically cutting the test piece along the edge of the bonding pull head by using an angle grinder, wherein the cutting depth is suitable for exposing the material of the bottom plate test piece, so that the bottom plate test piece is separated from the surrounding bonding glue, and the drawing stress range is ensured to be equal to the size of the bonding pull head; connecting the bonding pull head to a drawing instrument, performing a drawing test, and recording a strength peak value; the abrasion test procedure was as follows: after the embedded sand fog seal layer is paved, the test piece is maintained outdoors for 7 days at 25 ℃, and an accelerated loading abrasion tester is adopted for abrasion test; recording the abrasion value under each level of abrasion frequency, as shown in a formula (1), wherein when the abrasion frequency is 60k times, the abrasion value is reduced and slowly enters a stable stage;
in the formula: gc-specific abrasion per unit area,%;
m 1-original mass of test piece, kg;
m 2-weight of the test piece after abrasion, kg;
ms is the mass of the scattered gravels in the abrasion range, kg;
ml-the mass of the cementing material scattered in the abrasion range, kg;
fourthly, establishing a relation model between the pavement structure depth and the seal bonding strength and abrasion value, and determining the optimal structure depth range of the asphalt pavement and the cement pavement; establishing a mathematical function model between the bonding strength of the upper sealing layers of the asphalt pavement and the cement pavement, the 60k times corresponding abrasion value and the construction depth of the original pavement test piece, as shown in formulas (2) to (5):
ybonding of＝-0.3917x2+1.3881x+0.3765 (2)
yBonding of＝-0.7337x2+1.7484x+1.1755 (3)
yWear and tear＝5.2691x2-17.752x+38.265 (4)
yWear and tear＝2.6972x2-9.7713x+33.882 (5)
In the formula: y bond-tensile strength, MPa;
y abrasion-abrasion value,%;
x is the depth of the corresponding original pavement structure, mm;
the optimal construction depth ranges of the asphalt pavement and the cement pavement are respectively 1.0-1.8 mm and 1.0-1.4 mm;
the design of the seal material comprises the following steps:
step S1, determining the equivalent of the coverage rate of the seal coat gravels and the using amount of the gravels, and determining a relation model of the coverage rate of the gravels and the using amount of the gravels;
step S2, designing a seal material, and calculating the use amount of a seal aggregate and a cementing material;
in step S1, the method includes the following steps:
step S11, defining a black background area of 200mm by 200mm, respectively spreading two basalt macadams with single grain diameter of 2.36 mm-4.75 mm and determined quality, and collecting images;
step S12, generating a binary image after denoising the image by using an image processing technology, and counting the ratio of the rubble coverage area to obtain a relation model of the rubble coverage and the rubble usage, as shown in formula (6):
y＝0.0544x (6)
in the formula: y-amount of crushed stone, kg/m2；
x-rubble coverage,%;
the method is characterized in that:
in the step S2, the amount of the seal aggregate is determined by using Mcleod method, and the amount C is calculated by formula (7) to formula (9):
C＝(1-0.4×V)×H×G×E (7)
H＝M/(1.139285+0.011506×FI) (8)
in the formula: g-aggregate density, determination of G-2.575 t/m3；
V is the void ratio of the loose aggregate, the void ratio is measured to be 0.13 by adopting 2.36-4.75 mm single-particle-size aggregate;
m-theoretical median aggregate size, (2.36+ 4.75)/2-3.555;
FI is aggregate flake index, is not more than 5 percent, and the test value is 5 percent;
h, calculating the average height of the crushed stones to be 3.1048 mm;
e, aggregate loss rate, wherein aggregate loss is inevitable after the gravel seal is put into use, and 10 percent of aggregate loss is taken into consideration when the design is carried out, wherein 5 to 10 percent of aggregate loss is taken;
in conclusion, the optimal crushed stone dosage C of the TICS seal theory can be obtained to be 6.8kg/m2Coverage is 124%;
the cement amount is determined by equation (9):
B＝(0.4×H×T×V+S+A)/R (9)
in the formula: t is traffic volume correction factor; s-road condition correction factor; a is an aggregate absorption correction index, and if the surface performance of the original pavement layer has no great loss, 0 is taken; r is the effective content of the cementing material, the undiluted cementing material is 1, and the solid content of the emulsified asphalt is 0.558; H. and V is a calculation process value of formulas (7) to (8).
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