CN112378824A - Cement concrete pavement rubble broken particle size testing method - Google Patents
Cement concrete pavement rubble broken particle size testing method Download PDFInfo
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- CN112378824A CN112378824A CN202011327745.0A CN202011327745A CN112378824A CN 112378824 A CN112378824 A CN 112378824A CN 202011327745 A CN202011327745 A CN 202011327745A CN 112378824 A CN112378824 A CN 112378824A
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- 239000002245 particle Substances 0.000 title claims abstract description 59
- 239000004568 cement Substances 0.000 title claims abstract description 18
- 238000012360 testing method Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000012634 fragment Substances 0.000 claims description 48
- 239000000463 material Substances 0.000 claims description 9
- 210000003298 dental enamel Anatomy 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 238000003892 spreading Methods 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 238000012797 qualification Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 3
- 241000251131 Sphyrna Species 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0255—Investigating particle size or size distribution with mechanical, e.g. inertial, classification, and investigation of sorted collections
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/08—Measuring arrangements characterised by the use of mechanical techniques for measuring diameters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Road Repair (AREA)
Abstract
The invention discloses a cement concrete pavement rubble broken particle size testing method, aiming at the problems that the particle size of the cement concrete pavement rubble tested by the existing standard or standard is ambiguous by adopting a ruler measurement testing method, and whether the qualified rate index is met or not is ambiguous, the invention definitely adopts a specific method of ruler measurement, and in addition, the invention also definitely adopts a particle quality calculating method for the qualified rate coefficient of the particle size, thus having a very good prospect of popularization and application.
Description
Technical Field
The invention relates to a cement concrete pavement rubble broken particle size testing method.
Background
The cement concrete rubblization technology is that a cement concrete pavement is broken into an occlusion embedding flexible structure layer with a certain particle size, high bearing capacity and good reflection crack control effect at one time through special equipment, and the residual strength and materials of an old road are fully utilized. The technology originates from the United states in the later 20 th century and is divided into a multi-hammer rubble technology and a resonance rubble technology. The multi-hammer rubblization realizes plate crushing by the impact force of free falling of the hammer, and is characterized by large impact force, small plate crushing particle size and lower residual strength; the resonance rubblization is that vibration energy is transmitted to a cement concrete pavement plate through resonance equipment to cause the plate to resonate and quickly break and crack, the broken particle size is gradually increased from top to bottom, the upper layer particle size is relatively smaller and is in a relatively loose state to play a role in releasing stress, the lower layer broken layer is in an oblique interlocking state, the cracking angle is in a range of 30-60 degrees, and the broken layer is not scattered and has higher strength.
The particle size of the cement concrete after rubblization is a key parameter for evaluating the rubblization breaking degree, controlling the addition layer structure not to generate early reflection cracks and keeping the residual strength of the old pavement slab. The existing standard or local standard has a certain method and evaluation index for detecting the particle size. The existing standard or local standard is used for detecting the particle size of the broken and petrochemical cement concrete basically in a test pit, a ruler is used for measuring the particle size, and the method or the steps for measuring by using the ruler are not clear.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defect that the particle size measurement and evaluation standards in the prior art are not uniform, and provides a cement concrete pavement rubble broken particle size testing method.
A cement concrete pavement rubble broken particle size testing method comprises the following steps:
s1, randomly sampling to determine the position of pit digging inspection after rubblization;
s2, excavating fragments with the area of 100 +/-5 cm multiplied by 100 +/-5 cm and the depth of 4-8 cm from the surface in a selected test place, spreading the fragments in an enamel disc, measuring the particle size of the fragments, selecting and weighing the mass m of multi-hammerhead rubblization fragments with the particle size of more than 7.5cm or resonance rubblization fragments with the particle size of more than 5cm1Mass M of all fragments within 4-8 cm of surface1Accurate to 1 g;
s3, continuously excavating the material until the bottom surface of the layer is reached, cleaning the pit bottom by using a brush, and determining the pit bottom as the top surface of the next layer; spreading all materials in an enamel plate, measuring particle size of fragments, selecting and weighing mass m of multi-hammerhead rubble with particle size larger than 37.5cm or resonance rubble fragments larger than 31.5cm2Mass M of all fragments below 6cm on surface2Accurate to 1 g;
s4, filling the hole after digging the pit, and compacting and leveling by a heavy hammer or a road roller;
s5 calculation
Qd＝(M1-m1)/M1×100；
Qx＝(M2-m2)/M2×100；
In the formula: qd-top surface maximum grain size qualification rate;
Qx-the lower maximum grain size pass rate;
M1-mass of all fragments with a surface of 6 cm;
m1-mass of multi-hammerhead rubblized or resonance rubblized fragments with particle size larger than 7.5 cm;
M2-mass of all fragments below 6cm surface;
m2-mass of fragments with a particle size of more than 37.5cm hammerhead rubblization or more than 31.5cm (resonance rubblization).
Preferably, the fragment size is measured by excavating 6cm of the surface in S2, and the particle size is measured by using a straight steel ruler.
Further, when the particle size of the fragment is measured in S2 and S3, the maximum value of the size in the maximum length direction and the maximum thickness direction is used as the particle size of the fragment.
The invention has the following beneficial effects: aiming at the problems that the conventional standard or standard test method for the particle size of the cement concrete pavement after rubble is ambiguous by adopting a ruler measurement test method and whether the qualified rate index is met is ambiguous, the invention definitely adopts a specific method for ruler measurement and also definitely reasonably adopts a particle mass calculation method for the particle size qualified rate coefficient.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.
Examples
The method is suitable for testing the size of the rubblized particle size to evaluate the rubblized breaking degree, and is a key parameter for controlling the addition layer structure not to generate early-stage reflection cracks and keeping the residual strength of an old pavement slab.
Instrument and material specifications
(1) A steel ruler: the measuring range is not less than 300mm, and the division value is 1 mm.
(2) Balance: the sensory quantity is not more than 1 g.
(3) Pick, shovel, chisel, small shovel and brush are used for digging pit.
(4) And others: an enamel tray.
Method and step
(1) Randomly sampling and determining the position of pit digging inspection after rubblization according to the relevant requirements of annex A of the existing test regulation on the road subgrade and pavement site (JTG 3450).
(2) Selecting a test site, selecting a surface of about 100cm × 100cm, excavating fragments with the surface of 6cm, spreading in an enamel plate, measuring the particle size of the fragments with a steel ruler, selecting and weighing the mass m of the fragments with the particle size larger than 7.5cm (multi-hammer rubble) or larger than 5cm (resonance rubble) by taking the maximum size in the maximum length direction and the maximum size in the maximum thickness direction as the particle size of the fragments1Mass M of all fragments with surface of 6cm1Accurate to 1 g.
(3) Selecting proper tools such as a pickaxe, a shovel, a chisel and the like according to the crushing degree, continuously excavating materials with the surface less than 6cm till the bottom of the layer, and cleaning the pit bottom by using a brush to determine the top of the next layer. Spreading all materials in an enamel plate, measuring the particle size of the fragments by using a steel ruler, selecting and weighing the mass m of the fragments with the particle size larger than 37.5cm (multi-hammerhead rubbilization) or larger than 31.5cm (resonance rubbilization) by taking the maximum size in the maximum length direction and the maximum size in the maximum thickness direction as the particle size of the fragments2Mass M of all fragments below 6cm on surface2Accurate to 1 g.
(4) After the excavation is finished, the hole is filled with graded broken stones and other materials, a little bit higher than the original broken stone layer is needed, and the holes are compacted and leveled by a heavy hammer or a road roller.
Computing
The particle size yield was calculated according to formulas 4-1 and 4-2.
Qd＝(M1-m1)/M1×100 (4-1)
Qx＝(M2-m2)/M2×100 (4-2)
In the formula: qd-top surface maximum grain size qualification rate;
Qx-the lower maximum grain size pass rate;
M1-mass of all fragments with a surface of 6 cm;
m1mass of fragments with a particle size greater than 7.5cm (multi-hammerhead rubblization) or greater than 5cm (resonance rubblization);
M2-mass of all fragments below 6cm surface;
m2masses of fragments with a particle size of greater than 37.5cm (multi-hammerhead rubblization) or greater than 31.5cm (resonance rubblization).
The embodiment makes the specific test method for measuring the particle size by using the ruler more clear, makes the particle size yield coefficient calculation method clear, and has a very good prospect of popularization and application.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A cement concrete pavement rubble broken particle size test method is characterized by comprising the following steps:
s1, randomly sampling to determine the position of pit digging inspection after rubblization;
s2, selecting a test site, excavating fragments with the depth of 4-8 cm from the surface, paving the fragments in an enamel plate, measuring the particle size of the fragments, selecting and weighing the mass of multi-hammerhead rubble fragments with the particle size of more than 7.5cm or resonance rubble fragments with the particle size of more than 5cmm1Mass M of all fragments within 4-8 cm of surface1Accurate to 1 g;
s3, continuously excavating the material until the bottom surface of the layer is reached, cleaning the pit bottom by using a brush, and determining the pit bottom as the top surface of the next layer; spreading all materials in an enamel plate, measuring particle size of fragments, selecting and weighing mass m of multi-hammerhead rubble with particle size larger than 37.5cm or resonance rubble fragments larger than 31.5cm2Mass M of all fragments below 6cm on surface2Accurate to 1 g;
s4, filling the hole after digging the pit, and compacting and leveling by a heavy hammer or a road roller;
s5 calculation
Qd＝(M1-m1)/M1×100；
Qx＝(M2-m2)/M2×100；
In the formula: qd-top surface maximum grain size qualification rate;
Qx-the lower maximum grain size pass rate;
M1-mass of all fragments with a surface of 6 cm;
m1-mass of multi-hammerhead rubblized or resonance rubblized fragments with particle size larger than 7.5 cm;
M2-mass of all fragments below 6cm surface;
m2-mass of fragments with a particle size of more than 37.5cm hammerhead rubblization or more than 31.5cm (resonance rubblization).
2. The method for testing rubblized broken particle size of cement concrete pavement according to claim 1, wherein the particle size of the fragment is measured by excavating a 6cm fragment on the surface in S2.
3. The method for testing rubblized crushed particle size of a cement concrete pavement according to claim 1, wherein the particle size of the fragments is measured by using a straight steel ruler.
4. The method for testing rubblized crushed particle size of a cement concrete pavement according to claim 1, wherein the maximum values of the sizes in the maximum length direction and the maximum thickness direction are used as the particle size of the fragment when the particle size of the fragment is measured in S2 and S3.
5. The method for testing rubblized crushed particle size of a cement concrete pavement according to claim 1, wherein the area of the removed fragment is 100 ± 5cm x 100 ± 5cm at the selected test site.
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| CN202011327745.0A CN112378824A (en) | 2020-11-24 | 2020-11-24 | Cement concrete pavement rubble broken particle size testing method |
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| CN202011327745.0A CN112378824A (en) | 2020-11-24 | 2020-11-24 | Cement concrete pavement rubble broken particle size testing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117196379A (en) * | 2023-08-22 | 2023-12-08 | 佛山市交通科技有限公司 | Pavement rubblization construction quality detection method and system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106192698A (en) * | 2016-08-30 | 2016-12-07 | 中国十九冶集团有限公司 | Highway pavement rubblization processes recycling laying construction structure and technique |
| CN111501512A (en) * | 2020-04-30 | 2020-08-07 | 镇江港务集团有限公司 | Multi-stage rubblization construction method for road surface |
| CN112779834A (en) * | 2020-12-31 | 2021-05-11 | 中交第三航务工程局有限公司江苏分公司 | Resonance rubblizing process for old cement concrete pavement |
-
2020
- 2020-11-24 CN CN202011327745.0A patent/CN112378824A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106192698A (en) * | 2016-08-30 | 2016-12-07 | 中国十九冶集团有限公司 | Highway pavement rubblization processes recycling laying construction structure and technique |
| CN111501512A (en) * | 2020-04-30 | 2020-08-07 | 镇江港务集团有限公司 | Multi-stage rubblization construction method for road surface |
| CN112779834A (en) * | 2020-12-31 | 2021-05-11 | 中交第三航务工程局有限公司江苏分公司 | Resonance rubblizing process for old cement concrete pavement |
Non-Patent Citations (4)
| Title |
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| 中国公路学会: ""公路水泥混凝土路面碎石化技术指南"", 《团体标准 T/CHST 10027-2020》 * |
| 吴桂金等: "旧水泥混凝土路面碎石化原位利用技术应用", 《筑路机械与施工机械化》 * |
| 张叔林等: "旧水泥混凝土路面共振碎石化施工质量评价方法研究", 《公路交通科技(应用技术版)》 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117196379A (en) * | 2023-08-22 | 2023-12-08 | 佛山市交通科技有限公司 | Pavement rubblization construction quality detection method and system |
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