This standard applies to the performance test of soil subgrade, road surface materials and overall structure in urban road pavement design. CJJ/T 59-1994 Standard for determination of design parameters of flexible pavement CJJ/T59-94 CJJ/T59-1994 Standard download decompression password: www.bzxz.net

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Industry Standard of the People's Republic of China
Standard for test method of the flexible pavement design parameter
CJJ/T59—94
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Industry Standard of the People's Republic of China
Standard for test method of the flexible pavement design parameter pavementdesignparameter
CJJ/T59—94
Editing unit: Beijing Municipal Design InstituteApproving department: Ministry of Construction of the People's Republic of ChinaEffective date: June 1, 1995
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Notice on the Release of the Industry Standard "Standard for Determination of Design Parameters of Flexible Pavement"
Jianbiao [1994] No. 733
In accordance with the requirements of the Ministry of Construction's (88) Chengbiao No. 141 document, the "Standard for Determination of Design Parameters of Flexible Pavement" edited by Beijing Municipal Design Institute has been reviewed and approved as a recommended industry standard, numbered CJJ/T59—94, and will be implemented on June 1, 1995.
This standard is managed by the Beijing Municipal Design Institute, the technical unit responsible for urban road and bridge standards of the Ministry of Construction, and the chief editor is responsible for specific interpretations, etc. The Standard and Quota Research Institute of the Ministry of Construction is responsible for organizing and publishing.
Ministry of Construction of the People's Republic of China
December 5, 1994
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1. General Provisions
2. Symbol
3. Determination method of soil base rebound modulus
3.1 Determination method of standard bearing plate...
3.2 Determination method of indoor small bearing plate
3.3 Determination method using CBR tester*
4. Determination method of pavement material rebound modulus
......
4.1 Determination method of standard bearing plate
4.2 Determination method of indoor compressive rebound modulus of integral material5. Determination method of flexural tensile strength and flexural tensile modulus of integral material 5.1 Determination method of flexural strength and flexural modulus 6. Determination method of high-temperature shear strength and compression modulus of asphalt mixture 6.1 Determination method of closed static triaxial compression shear strength 6.2 Determination method of high-temperature compression rebound modulus* 7. Determination method of overall strength of pavement structure
7.1 Determination method of road surface rebound deflection value.
7.2 Determination method of equivalent rebound modulus of old road using automobile measured deflection value Appendix A Subgrade parameter measurement record
A.1 Standard bearing plate, moisture content, density test record A.2 Indoor small load-bearing plate test record
A.3CBR tester measurement record...
3Integral material compressive rebound modulus measurement record Appendix B
B.1 Standard load-bearing plate measurement pavement material compressive rebound modulus measurement record B.2 Asphalt mixture, semi-rigid material compressive rebound modulus measurement record Appendix C Integral material flexural tensile strength and modulus measurement record C.1 Integral material flexural tensile strength and modulus measurement record Engineering Construction Standard Full Text Information System
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) Record of determination of high-temperature shear strength and compression modulus of asphalt mixture 74 Appendix D
Record of determination of high-temperature shear strength of asphalt mixture 74
D.2 Record of determination of high-temperature compression rebound modulus of asphalt mixture 77
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Appendix E
Record of determination of overall strength of pavement structure
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E.． Record of determination of road surface rebound deflection value
Explanation of terms used in this standard
Appendix F
Additional explanation
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1. General Provisions
This standard is formulated to implement the "Urban Road Design Code" and unify the test methods and data collation of flexible pavement design parameter test values. 1.0.1
This standard is applicable to the performance tests of soil base, roadbed and pavement materials and overall structure in urban road pavement design.
1.0.3 In addition to implementing this standard, the determination method of flexible pavement design parameters shall also comply with the provisions of the current "Urban Road Design Code" (CJJ37) and other relevant standards. Engineering Construction Standard Full-text Information System
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The symbols of flexible pavement design parameters shall comply with the provisions of Table 2.0.1. Table 2.0.1
Cross-sectional area of ​​specimen (cm2)
Compressive area of ​​specimen (m2)
Total influence of rebound deformation when vehicle is loaded (0.01mm)Influence of unit pressure of bearing plate (0.01mm)
Mid-span width of beam (m)
Adhesion of material (MPa)
Diameter of bearing plate (cm)
Compressive rebound modulus of pavement material (MPa)Flexural rebound modulus of pavement material (MPa)Soil base rebound modulus (MPa)
Equivalent rebound modulus of old road surface (MPa)
Compressive rebound deformation corresponding to oa within the gauge length rangeCorresponding to bending rebound deformation of m (mm)
Flexural strength (MPa)
Beam Mid-span height (m)
Measurement gauge length of compression test piece (mm)
Asphalt pavement surface layer thickness (cm)
Or within the gauge length range
Beam span (m); or Difference between loading reading and unloading reading during rebound deflection measurement (0.01mm)
Rebound deflection value measured by standard axle load vehicle (cm) Actual rebound deflection value corresponding to pi (cm) Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Rebound deflection value of standard load-bearing plate at equal pressure pt with tire (cm)Measurement gauge length of bending tensile test piece (mm)
Rebound deflection value of road surface at road surface temperature of T (℃) (cm) Pa
Failure load (kN)
Reference failure load (kN)
Level i load (kN)
Standard load (kN)
Test load (kN)
Level i pressure on the bearing plate
Standard axle load automobile tire pressure (MPa)
Average temperature of asphalt pavement surface layer (℃)
Sum of pavement surface temperature and average temperature of the previous 5 hours during measurement (℃)Volume of specimen (cms)
Water content of specimen (%)
Measured values ​​of each test
Average value of test values
Relative error of each test value (%)
Compressive strain
Flexural strain
Compaction coefficient
Coefficient for converting automobile deflection value la to standard bearing plate deflection valuePoisson's law of material Ratio
Poisson's ratio of soil foundation
Dry density of specimen (g/cm2)
Compressive stress (MPa)
Flexural stress (MPa)
Intercept of the straight line 0-8 on the α axis
(MPa)
Internal friction angle of the material ()
Temperature correction coefficient
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3. Determination method of seven-base rebound modulus
3.1 Standard bearing plate determination method
3.1.1 This method is applicable to the determination of the rebound modulus of old road foundation, newly completed foundation and test trench foundation using a 30cm standard single-circle rigid bearing plate on site. 3.1.2 The test equipment should meet the following requirements: (1) One test vehicle with a rear axle load of 60kN or 100kN. A stiffening crossbeam is attached to the vehicle frame at a distance of 80cm from the rear axle. The test vehicle is loaded with a specified load of 60kN or 100kN. If the test is carried out in a test tank, a reaction frame can be used for loading. (2) One rigid load-bearing plate with a diameter of 30cm and a thickness of about 2cm, with columns at both ends for accommodating the probe of the deflection meter.
(3) One 60~100kN hydraulic jack equipped with an oil pressure gauge and a calibration curve.
(4) Two deflection instruments, with two sets of dial indicators and brackets, see Figure 3.1.2. 0n
Figure 3.1.2 Deflection instrument
1-probe, 2-front lever; 3-leveling screw, 4-rear lever; 5-base; 6-dial indicator, 7-meter stand, 8-vertical pole (5) Several pads for connecting the height jack, a spherical support and an iron rod that can connect the vertical columns on both sides of the bearing plate.
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(6) Level ruler, plumb bob, stopwatch, 2m steel tape measure, etc. (7) Standard sand.
(8) Excavation and leveling tools, pickaxe, shovel, spade, etc. (9) Balance: one for weighing 200g and 0.1g sensitivity; one for weighing 1000g and 1g sensitivity.
(10) Twist drill or Luoyang shovel for measuring water content and ring knife and handle for measuring density. (11) Several aluminum boxes, soil bags, safety signs, red and green flags for directing traffic, etc.
3 The test for determining the soil base rebound modulus with standard bearing plate shall meet the following requirements: 3.1.3
3.1.3.1 The test section for on-site test shall be selected on the soil base of the motor vehicle road or the completed compacted soil base, and different soil groups and different wet types shall be considered. 3.1.3.2 In order to obtain the soil base rebound modulus with different water content and different compaction degree, it can be measured in a test trough, with the following requirements:
(1) The test trough can be dug with a length of 3m, a width of 2m and a depth of 1m. The fill soil should be compacted in layers to control the required density and water content. It should be covered after completion to prevent water evaporation. (2) The distance between the center of the measuring point and the edge of the test trough shall not be less than 50 cm, and the distance between the centers of the measuring points shall not be less than 50 cm.
(3) The number of measuring points shall not be less than 7. The arrangement of measuring points is shown in Figure 3.1.3-1.12
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Figure 3.1.3-1 Arrangement of measuring points in the test trough
3.1.3.3 The measurement method shall be carried out in the following steps: (1) Carefully level the surface of the soil foundation at the measuring point, spread standard sand to fill the concave part of the soil foundation, and the standard sand shall not cover the entire surface of the soil foundation to form a layer. Lay the bearing plate flat so that the bottom is in close contact with the soil foundation surface.
(2) Place the columnar pad and spherical support on the bearing plate. Add a rubber pad to the spherical support.
(3) The measuring heads of the two deflection meters are respectively installed on the columns at both ends of the load-bearing plate or beside the columns, so that the distance between the two sides is equal. Level the support of the deflection meter. Set up the dial indicator for measuring deformation.
(4) The car moves backward so that the center of the stiffening beam is aligned with the center of the ball seat. Then install the jack and adjust the height of the jack so that the load-bearing plate begins to be compressed. The test device is shown in Figure 3.1.3-2.
Figure 3.1.3-2 Load-bearing plate test device
1—Small supporting beam, 2—Rear wheel of the car, 3—Jack oil pressure gauge, 4—Load-bearing plate, 5—Jack, 6—Deflection meter, 7—A dial indicator, 8—Instrument stand (5) In order to make the bottom surface of the load-bearing plate in close contact with the test surface, pre-compression should be carried out. The pre-compression is 0.05MPa. After stabilizing the pressure for 1min, unload the load and zero the dial indicator on the deflection meter. For wet and soft foundation, the preload should be determined according to the actual situation to ensure close contact. (6) To measure the foundation pressure-deformation curve, use the step-by-step loading and unloading method. Record the dial gauge reading after loading and stabilizing the pressure for 1 minute each time, and record the dial gauge reading after unloading and stabilizing the pressure for 1 minute. The reading error of the left and right deflection meters shall not exceed 30%. If exceeded, the cause should be analyzed and re-measured.
The loading and unloading procedures are as follows, but they can be adjusted appropriately according to the actual situation. 0→0. 02MPa--0
0-→0.04MPa→0
0→0.06MPa→0
0-→0.08MFa→0
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Engineering Construction Standard Full-text Information System
0->0.10MPa→0
0→0.15MPa-→0
0-→0.20MPa-→0
(7)After loading and unloading step by step, record the dial gauge reading. Drive the car 10m away from the measuring point and record the dial gauge reading after it stabilizes for 1min. The difference between this reading and the dial gauge reading of the last unloading step is the total impact a (0.01mm). The rebound deformation influence amount a at each level of loading, (0.01mm) rear axle axle plant
bearing plate
unit pressure P
Note: a in the table is the total influence amount (0.01mm) 100
The rebound deformation values ​​of each level of load are added to the influence amount ap listed in Table 3.1.3 (this table is applicable when the stiffening beam is 80cm away from the rear axle) to calculate the rebound deflection value loap as follows:
Influence amount when the bearing plate unit pressure is P (0.01mm); Engineering Construction Standard Full-text Information System
KAONTKAca=05MPa, unload after stabilizing pressure for 1 minute, and zero the dial indicator on the deflection meter. For wet and soft base, the preload should be determined according to the actual situation to ensure close contact. (6) Determine the base pressure-deformation curve, use the step-by-step loading and unloading method, record the dial indicator reading after each loading and stabilizing pressure for 1 minute, and record the dial indicator reading after unloading and stabilizing pressure for 1 minute. The reading error of the left and right deflection meters shall not exceed 30%. If exceeded, the cause should be analyzed and re-measured.
The loading and unloading procedures are as follows, but they can be adjusted appropriately according to actual conditions. 0→0. 02MPa--0
0-→0.04MPa→0
0→0.06MPa→0
0-→0.08MFa→0
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Engineering Construction Standard Full-text Information System
0->0.10MPa→0
0→0.15MPa-→0
0-→0.20MPa-→0
(7)After loading and unloading step by step, record the dial gauge reading. Drive the car 10m away from the measuring point and record the dial gauge reading after it stabilizes for 1min. The difference between this reading and the dial gauge reading of the last unloading step is the total impact a (0.01mm). The rebound deformation influence amount a at each level of loading, (0.01mm) rear axle axle plant
bearing plate
unit pressure P
Note: a in the table is the total influence amount (0.01mm) 100
The rebound deformation values ​​of each level of load are added to the influence amount ap listed in Table 3.1.3 (this table is applicable when the stiffening beam is 80cm away from the rear axle) to calculate the rebound deflection value loap as follows:
Influence amount when the bearing plate unit pressure is P (0.01mm); Engineering Construction Standard Full-text Information System
KAONTKAca=05MPa, unload after stabilizing pressure for 1 minute, and zero the dial indicator on the deflection meter. For wet and soft base, the preload should be determined according to the actual situation to ensure close contact. (6) Determine the base pressure-deformation curve, use the step-by-step loading and unloading method, record the dial indicator reading after each loading and stabilizing pressure for 1 minute, and record the dial indicator reading after unloading and stabilizing pressure for 1 minute. The reading error of the left and right deflection meters shall not exceed 30%. If exceeded, the cause should be analyzed and re-measured.
The loading and unloading procedures are as follows, but they can be adjusted appropriately according to actual conditions. 0→0. 02MPa--0
0-→0.04MPa→0
0→0.06MPa→0
0-→0.08MFa→0
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Engineering Construction Standard Full-text Information System
0->0.10MPa→0
0→0.15MPa-→0
0-→0.20MPa-→0
(7)After loading and unloading step by step, record the dial gauge reading. Drive the car 10m away from the measuring point and record the dial gauge reading after it stabilizes for 1min. The difference between this reading and the dial gauge reading of the last unloading step is the total impact a (0.01mm). The rebound deformation influence amount a at each level of loading, (0.01mm) rear axle axle plant
bearing plate
unit pressure P
Note: a in the table is the total influence amount (0.01mm) 100
The rebound deformation values ​​of each level of load are added to the influence amount ap listed in Table 3.1.3 (this table is applicable when the stiffening beam is 80cm away from the rear axle) to calculate the rebound deflection value loap as follows:
Influence amount when the bearing plate unit pressure is P (0.01mm); Engineering Construction Standard Full-text Information System
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