In-situ detection vehicle and method for volume / mechanical state in asphalt pavement compaction process

Abstract

The invention discloses an asphalt pavement compaction process volume / mechanical state in-situ detection vehicle, which comprises a mobile trolley, the mobile trolley is provided with a compaction degree detector, a vertical loading assembly, a transverse torsion assembly and a temperature assembly, the compaction degree detector is used for measuring the compaction degree of an asphalt pavement, and the vertical loading assembly is used for loading the compaction degree of the asphalt pavement. The vertical loading assembly is used for carrying out vertical loading on the asphalt pavement and obtaining loading displacement through a displacement sensor so as to obtain the modulus of the asphalt pavement, the transverse torsion assembly is used for applying a torsion load to the asphalt pavement and obtaining the torsion strength of the asphalt pavement, and the temperature assembly is used for measuring the temperature of the asphalt pavement. According to the invention, the acquisition of volume and mechanical indexes such as modulus, strength and compactness can be realized, and the unification of detection and design is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of highway performance detection, and in particular relates to a vehicle and method for in-situ detection of volume and mechanical state during the compaction process of an asphalt pavement. Background Art

[0002] Material design flaws, heavy loads and traffic, and inadequate pavement compaction quality are the primary contributing factors to early-stage road failures. Construction, a key step in developing asphalt pavement stiffness and strength, leads to structural over-compaction, under-compaction, and uneven compaction quality, leading to insufficient pavement durability. Consequently, inadequate pavement compaction quality is widely recognized as a pain point in highway construction. Accurately monitoring pavement compaction status and effectively improving its quality have become key challenges and challenges within the highway engineering industry.

[0003] At present, a lot of research has been done on the compaction quality detection of asphalt pavement at home and abroad, such as drilling asphalt mixture core samples on site (CN202211590863.X), measuring the density of the core samples and evaluating the volume state with the standard density to obtain the compaction degree; using the non-nuclear density meter method to monitor the volume state of the pavement in real time and obtain the density (CN202210285919.4); using ground penetrating radar to emit high-frequency electromagnetic waves and analyze the reflected signals (EP2972252B1), establishing a mathematical relationship model between the dielectric constant and the volume state, and then calculating the compaction degree, etc. However, there are the following pain points: 1) Asphalt pavement 1) Testing indicators are disconnected from design indicators. Traditionally, the construction and quality acceptance standard for asphalt pavements is based on the volumetric indicator compaction, while the pavement material structure is theoretically designed based on mechanical indicators such as stiffness and strength. This leads to a lack of consistency between testing and design. 2) Testing lags behind construction. For example, core sampling is performed as a post-construction and destructive test, making it impossible to conduct a second compaction on quality issues that have already been completed. 3) Testing indicators are incomplete. Traditional testing uses compaction as a single evaluation indicator, but lacks testing for mechanical indicators such as temperature of asphalt pavements. The superposition of multiple testing systems can easily cause testing site offsets, resulting in high variability in test data. This makes it difficult to ensure compaction quality during construction. Summary of the Invention

[0004] In response to the problems existing in the existing asphalt pavement compaction detection, the purpose of the present invention is to propose an in-situ detection vehicle and method for the volume / mechanical state of the asphalt pavement compaction process, aiming to realize the collection of volume and mechanical indicators such as modulus, strength, and compaction degree, and to achieve the unity of detection and design.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: A vehicle for in-situ detection of the volume / mechanical state of an asphalt pavement during compaction comprises a mobile trolley provided with a compaction detector, a vertical loading assembly, a lateral torsion assembly, and a temperature assembly. The compaction detector is used to measure the density of the asphalt pavement. The vertical loading assembly is used to vertically load the asphalt pavement and obtain the loading displacement through a displacement sensor to thereby obtain the modulus of the asphalt pavement. The lateral torsion assembly is used to apply a torsional load to the asphalt pavement to obtain the torsional strength of the asphalt pavement. The temperature assembly is used to measure the temperature of the asphalt pavement.

[0006] Specifically, the lateral torsion assembly includes a lateral torsion loading plate, a torsion motor for driving the lateral torsion loading plate to twist laterally, and a moving loading cylinder for vertical movement. A plurality of vertically arranged test claws are evenly arranged on the lower end surface of the lateral torsion loading plate along its circumferential direction.

[0007] Specifically, the vertical loading assembly includes a vertical loading rod and a vertical loading cylinder driving the vertical loading rod to move.

[0008] Specifically, the center of the transverse torsion loading disk is provided with a through hole for the vertical loading rod to pass through, and the vertical loading rod is slidably assembled in the through hole. Specifically, the temperature component includes a temperature sensor, and the temperature sensor is integrated on the vertical loading rod.

[0009] Specifically, the compaction tester adopts an asphalt non-nuclear density meter.

[0010] A method for in-situ detection of volume / mechanical state during asphalt pavement compaction process, comprising the following steps: S1. After the asphalt pavement mid-surface construction and re-compaction are completed, the asphalt pavement volume and mechanical condition spot check will begin. The in-situ inspection vehicle will be driven to the designated spot check pile number. S2. Turn on the compaction tester to measure the compaction of the asphalt pavement; S3 then open the vertical loading cylinder to set the vertical loading rate to start the modulus test of the pile number, then the vertical loading rod recovery, open the mobile loading cylinder; Then the loading cylinder is moved to drive the lateral torsion loading plate to move downward, so that the test claw penetrates into the asphalt pavement. Then the torsion motor is started to apply the lateral torque and record the shear failure strength of the asphalt pavement.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can simultaneously realize the collection of volume and mechanical indicators such as modulus, strength, and compactness, realizing the unity of detection and design.

[0012] 2. The present invention can collect mechanical states such as modulus and strength at the same position without changing the detection position, solving the problem of large variability in detection data caused by different detection sites. At the same time, the detection vehicle can be used in conjunction with a road roller for construction, which is particularly suitable for side-by-side inspection of compaction quality during asphalt pavement rolling. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the in-situ detection vehicle of the present invention; Figure 2 Schematic diagram of the lateral torsion assembly of the present invention.

[0014] Among them: 1. Compaction tester; 2. Vertical loading assembly; 3. Transverse torsion assembly; 4. Transverse torsion loading plate; 5. Test claw; 6. Vertical loading rod; 7. Through hole. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0016] See also Figure 1 and Figure 2 , an in-situ detection vehicle for volume / mechanical state of asphalt pavement compaction process, including a mobile trolley, on which are provided a compaction detector 1, a vertical loading component 2, a lateral torsion component 3 and a temperature component. The compaction detector 1 is used to measure the density of the asphalt pavement, the vertical loading component 2 is used to vertically load the asphalt pavement, and obtain the loading displacement through the displacement sensor, thereby obtaining the modulus of the asphalt pavement, the lateral torsion component 3 is used to apply a torsional load to the asphalt pavement, and obtain the torsional strength of the asphalt pavement, and the temperature component is used to measure the temperature of the asphalt pavement. The present invention can simultaneously realize the collection of volume and mechanical indicators such as modulus, strength, and compaction, and realize the unity of detection and design. Among them, the compaction detector 1 adopts an asphalt non-nuclear density meter.

[0017] See also Figure 1 and Figure 2The lateral torsion assembly 3 includes a lateral torsion loading disk 4, a torsion motor (not shown in the figure) that drives the lateral torsion loading disk 4 to torsion laterally, and a moving loading cylinder (not shown in the figure) that moves vertically. A plurality of vertically arranged test claws 5 are evenly arranged on the lower end surface of the lateral torsion loading disk 4 along its circumferential direction. The vertical loading assembly 2 includes a vertical loading rod 6 and a vertical loading cylinder (not shown in the figure) that drives the vertical loading rod 6 to move. A through hole 7 for the vertical loading rod 6 to pass through is provided in the center of the lateral torsion loading disk 4. The vertical loading rod 6 is slidably assembled in the through hole 7. The temperature assembly includes a temperature sensor (not shown in the figure). The temperature sensor is integrated on the vertical loading rod 6. The temperature sensor type is T-type WRCK-191, and the probe diameter is 4 mm.

[0018] When using the above-mentioned in-situ detection vehicle to perform in-situ detection of the volume / mechanical state of the asphalt pavement compaction process, the following steps are included: S1. After the asphalt pavement mid-surface construction and re-compaction are completed, the asphalt pavement volume and mechanical condition spot check will begin. The in-situ inspection vehicle will be driven to the designated spot check pile number. S2. Turn on the compaction tester 1 and measure the compaction of the asphalt pavement, which is 97%; S3. The vertical loading cylinder is then opened and loaded at a vertical loading rate of 10 mm / min. The displacement sensor simultaneously measures the vertical deformation and begins modulus testing for the pile, measuring a compression modulus of 11.2 MPa. Simultaneously, the temperature sensor measures a temperature of 102°C. Then the vertical loading rod 6 is retracted, the mobile loading cylinder is opened, and then the mobile loading cylinder drives the lateral torsion loading plate 4 to move downward, so that the test claw 5 penetrates into the asphalt pavement. Then the torsion motor is started, and the lateral torque load is applied at a loading speed of 1° / min, and the shear failure strength of the asphalt pavement is recorded.

[0019] The present invention can realize the collection of mechanical states such as modulus and strength at the same position without changing the detection position, solving the problem of large variability in detection data caused by different detection sites. At the same time, the detection vehicle can be equipped with a road roller for construction, which is particularly suitable for the simultaneous inspection of compaction quality during the asphalt pavement rolling process.

Claims

1. An in-situ vehicle for detecting the volume and mechanical state of an asphalt pavement during compaction, comprising a mobile vehicle, characterized in that: The mobile trolley is provided with a compaction detector, a vertical loading component, a lateral torsion component and a temperature component. The compaction detector is used to measure the density of the asphalt pavement. The vertical loading component is used to vertically load the asphalt pavement and obtain the loading displacement through the displacement sensor to obtain the modulus of the asphalt pavement. The lateral torsion component is used to apply a torsional load to the asphalt pavement to obtain the torsional strength of the asphalt pavement. The temperature component is used to measure the temperature of the asphalt pavement.

2. The asphalt pavement compaction process volume / mechanical state in-situ detection vehicle according to claim 1, characterized in that: The lateral torsion assembly includes a lateral torsion loading disc, a torsion motor for driving the lateral torsion loading disc to torsion laterally, and a moving loading cylinder for vertical movement. A plurality of vertically arranged test claws are evenly arranged on the lower end surface of the lateral torsion loading disc along its circumferential direction.

3. The asphalt pavement compaction process volume / mechanical state in-situ detection vehicle according to claim 2, characterized in that: The vertical loading assembly includes a vertical loading rod and a vertical loading cylinder driving the vertical loading rod to move.

4. The asphalt pavement compaction process volume / mechanical state in-situ detection vehicle according to claim 3, characterized in that: A through hole is provided at the center of the transverse torsion loading disk for the vertical loading rod to pass through, and the vertical loading rod is slidably assembled in the through hole.

5. The asphalt pavement compaction process volume / mechanical state in-situ detection vehicle according to claim 4, characterized in that: The temperature assembly includes a temperature sensor integrated on the vertical loading rod.

6. The asphalt pavement compaction process volume / mechanical state in-situ detection vehicle according to claim 4, characterized in that: The compaction degree detector adopts an asphalt non-nuclear density meter.

7. A method for in-situ volume / mechanical state detection during asphalt pavement compaction, using the in-situ volume / mechanical state detection vehicle during asphalt pavement compaction according to any one of claims 3 to 6, characterized in that: The steps include: S1. After the asphalt pavement mid-surface construction and re-compaction are completed, the asphalt pavement volume and mechanical condition spot check will begin. The in-situ inspection vehicle will be driven to the designated spot check pile number. S2. Turn on the compaction tester to measure the compaction of the asphalt pavement; S3 then open the vertical loading cylinder to set the vertical loading rate to start the modulus test of the pile number, then the vertical loading rod recovery, open the mobile loading cylinder; Then the loading cylinder is moved to drive the lateral torsion loading plate to move downward, so that the test claw penetrates into the asphalt pavement. Then the torsion motor is started to apply the lateral torque and record the shear failure strength of the asphalt pavement.

Images