Evaluation device and method for simply identifying defects of recycled aggregate

Abstract

The invention relates to the technical field of road engineering and material testing, and discloses an evaluation device and method for simply recognizing recycled aggregate defects, the evaluation device comprises an arc-shaped support, a vertical supporting rod is fixedly connected to the top end of the middle of the arc-shaped support, and a movable clamping groove is formed in the middle of the top end of the vertical supporting rod; the vertical supporting rod is movably connected with a vertical clamping rod in a clamped mode through a movable clamping groove, and the side, close to the bottom end, of the middle of the vertical supporting rod is fixedly connected with a connecting supporting rod in a penetrating mode. Good basic data are provided for subsequent computer secondary image recognition, recognition of the recycled aggregate defects is started from the two aspects of morphological characteristics and pore characteristics, morphological characteristic reference indexes and a variance analysis method are used as methods for evaluating the recycled aggregate defects respectively, defect characteristics of recycled aggregates from different sources can be evaluated, and the defect characteristics of the recycled aggregates from different sources can be evaluated. Equipment composition is simple, operation is easy, the evaluation method is simple, and results are visual.

Description

Technical Field

[0001] The invention relates to the technical field of road engineering and material testing, and more particularly to an evaluation device and method for simply identifying defects in recycled aggregate. Background Art

[0002] With the continuous development of urbanization, a large number of buildings that have reached their service life and do not meet current usage needs are demolished or rebuilt, which inevitably generates a large amount of construction waste. Abandoned concrete in construction solid waste can be used as raw materials for engineering construction after crushing, screening and other treatments. However, since recycled aggregates themselves contain a large amount of residual mortar and pore structure, they have obvious defects compared with natural aggregates. Any application in foundation engineering will cause considerable safety hazards. How to identify the defects of recycled aggregates and judge whether they can be put into use is of great significance.

[0003] At present, the research on the defects of recycled aggregates has received attention. Mastering the defect characteristics of recycled aggregates plays an important role in the selection, strengthening and modification, and application scenarios of recycled aggregates. Whether the defect types of recycled aggregates are microcracks caused by stone damage, the pore structure of residual mortar, or the weak interface transition zone on the micro level, which is fragile due to the presence of fine cracks. It shows that it is necessary to study the pore structure of recycled aggregates and analyze the performance of recycled aggregates. Currently, the mercury porosity method is mostly used to determine the distribution of pore size and porosity of recycled aggregates, but its test conditions are complex, the equipment is not popular, and the test cost is high. For recycled concrete, the morphological characteristics of recycled aggregates have an important influence on their working performance. At present, indoor physical performance index tests are mostly used to judge, and more attention is paid to the results of the defect performance of the recycled aggregate itself, which cannot fully reflect the morphological characteristics of the recycled aggregate.

[0004] In addition, due to the different sources of original concrete in different regions, the performance of recycled aggregates is also highly discrete. Therefore, it is not reasonable to judge whether recycled aggregates can be used only by the numerical value of performance indicators. At present, there is a lack of simple, convenient and quantitative equipment to test and evaluate the defects of recycled aggregates.

[0005] Based on the harmfulness of the current defective use of recycled aggregates, in order to facilitate the grasp and evaluation of the defect characteristics of recycled aggregates, a high-quality image acquisition device with simple operation is combined with a new image recognition technology, as well as scientific evaluation indicators and methods, so as to obtain the morphology and defect characteristics of recycled aggregates of different source types in real time, and obtain the evaluation and analysis results thereof. Therefore, the present invention provides an evaluation device and method for simply identifying defects in recycled aggregates. Summary of the invention

[0006] In order to overcome the above defects of the prior art, the present invention provides an evaluation device and method for simply identifying defects in recycled aggregates, so as to solve the problems existing in the above background technology.

[0007] The present invention provides the following technical solution: an evaluation device for simply identifying defects in recycled aggregates, comprising an arc-shaped support, a vertical support rod is fixedly connected to the top of the middle part of the arc-shaped support, a movable clamping groove is opened in the middle of the top of the vertical support rod, the vertical support rod is movably clamped with a vertical clamping rod through the movable clamping groove, a connecting support rod is fixedly penetrated and connected to one side of the middle part of the vertical support rod near the bottom end, the connecting support rod is fixedly connected to a screw anchor at one end near the arc-shaped support, and the connecting support rod is fixedly connected to the connecting support rod at one end far from the screw anchor, and the sample holder The top of the rack is fixedly connected to a sample table, the outer wall of the bottom end of the sample holder is fixedly connected to a tripod bracket, the top of the vertical clamping rod is fixedly connected to a universal joint, the outer wall of the universal joint is provided with an adjusting knob, the middle part of the universal joint is provided with a groove, the top of the universal joint is provided with a high-definition camera, the bottom end of the high-definition camera is fixedly connected to a steering ball, the universal joint places the steering ball of the high-definition camera in the groove and limits and steers the high-definition camera by using the adjusting knob, and the top of the high-definition camera is fixedly connected to a flash.

[0008] 2. The evaluation device for simply identifying defects in recycled aggregate according to claim 1 is characterized in that the diameter of the sample stage is 20 cm ± 1 cm, the sample stage is fixed on the sample bracket, and can be rotated in any direction.

[0009] Furthermore, the steering ball fixedly connected to the bottom end of the high-definition camera is a metal ball, and the direction can be changed arbitrarily by rotating the control knob, so that the shooting direction of the image acquisition device is aimed at the recycled aggregate, realizing flexible operation function.

[0010] Furthermore, the high-definition camera can stably output high-quality images with 20.1 million effective pixels, has an optical zoom of 24-120mm, and a memory capacity of 64GB.

[0011] Furthermore, the light source type of the flashlight is white LED, the flash index (GN) is 12, the flash rate is 0.004s, the operating voltage is 3.7v, and the battery capacity is 1200mAh, which meets general usage conditions.

[0012] A method for simply identifying defects in recycled aggregates, implemented in an evaluation device for simply identifying defects in recycled aggregates as claimed in claim 1, comprises the following contents:

[0013] S1. Obtain high-quality image data of recycled aggregates based on high-definition cameras, perform secondary image recognition processing through computer equipment, obtain morphological characteristics and pore characteristics of recycled aggregates, and provide data for subsequent evaluation and analysis of recycled aggregate defects;

[0014] S2. The method for evaluating and analyzing the morphological characteristics of recycled aggregates starts with the following reference indicators: aspect ratio (A) characterizes the size of the recycled aggregate needles, and It is used to calculate the aspect ratio, L is the length of the major axis of the equivalent ellipse of the recycled aggregate, and W is the width of the minor axis of the equivalent ellipse of the recycled aggregate; at the same time, the irregularity (Rou) is used to characterize the degree to which the recycled aggregate approaches a circle, and the To calculate, P er is the outer contour perimeter of the recycled aggregate read from the image, S is the area of ​​the recycled aggregate read from the image, and the angular parameter (AP) characterizes the angularity of the recycled aggregate and is calculated as Among them A P is the angular parameter, P C is the perimeter of the circumscribed polygon of recycled aggregate, P E is the equivalent ellipse circumference of recycled aggregate;

[0015] S3. The pores of recycled aggregate are analyzed by using the variance method to calculate the ratio of the pore area of ​​recycled aggregate to the aggregate area. Repeat several groups of images and calculate the variance values ​​of multiple groups of recycled aggregate images to obtain a reference result with small discreteness and deviation. To obtain the result with small discrete and deviation value as a reference, where σ 2 is the variance of the pore area ratio of recycled aggregate, j is the number of recycled aggregate images, M i is the pore area ratio of recycled aggregate, The technical effects and advantages of the present invention are as follows:

[0016] 1. The recycled aggregate defect identification device provided by the present invention can realize the continuous acquisition of high-quality aggregate images, provide good basic data for subsequent computer secondary image recognition, identify recycled aggregate defects from two aspects of morphological characteristics and pore characteristics, and use morphological characteristic reference indicators and variance analysis methods as methods for evaluating recycled aggregate defects. The defect characteristics of recycled aggregates from different sources can be evaluated. The equipment composition is simple, the operation is simple, the evaluation method is simple, and the results are intuitive. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the recycled aggregate defect image source device of the present invention.

[0018] Figure 2 It is a schematic diagram of the process of the recycled aggregate defect evaluation method of the present invention.

[0019] Figure 3 It is a schematic diagram of the morphological characteristics of the recycled aggregate of the present invention.

[0020] Figure 4 It is a schematic diagram of the recycled aggregate contour recognition image of the present invention.

[0021] Figure 5 It is a schematic diagram of the pore map of the recycled aggregate image recognition of the present invention.

[0022] The accompanying drawings are marked as follows: 1. arc-shaped support; 101. vertical support rod; 102. vertical clamping rod; 2. sample holder; 3. tripod bracket; 4. sample table; 5. connecting support rod; 6. universal joint; 7. adjustment knob; 8. high-definition camera; 9. flash; 10. screw anchor. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The evaluation device and method for simply identifying defects in recycled aggregates involved in the present invention are not limited to the various structures described in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0024] Reference Figure 1 and Figure 2 The present invention provides an evaluation device for simply identifying defects in recycled aggregate, comprising an arc-shaped support 1, a vertical support rod 101 is fixedly connected to the top of the middle part of the arc-shaped support 1, a movable clamping groove is provided in the middle of the top of the vertical support rod 101, the vertical support rod 101 is movably clamped with a vertical clamping rod 102 through the movable clamping groove, a connecting support rod 5 is fixedly connected through one side of the middle part of the vertical support rod 101 near the bottom end, the connecting support rod 5 is fixedly connected to the end of the connecting support rod 5 close to the arc-shaped support 1 and is fixedly connected to the end of the connecting support rod 5 far from the screw anchor 10, and the top of the sample bracket 2 is fixedly connected There is a sample table 4, the bottom outer wall of the sample holder 2 is fixedly connected with a triangular bracket 3, the triangular bracket 3 is fixed on the sample holder 2 to form a stable structure, the top of the vertical clamping rod 102 is fixedly connected with a universal joint 6, the outer wall of the universal joint 6 is provided with an adjusting knob 7, the middle part of the universal joint 6 is provided with a groove, the top of the universal joint 6 is provided with a high-definition camera 8, the bottom end of the high-definition camera 8 is fixedly connected with a steering ball, the universal joint 6 places the steering ball of the high-definition camera 8 in the groove and limits and steers the high-definition camera 8 by using the adjusting knob 7, and the top of the high-definition camera 8 is fixedly connected with a flash 9.

[0025] The diameter of the sample stage 4 is 20 cm±1 cm. The sample stage 4 is fixed on the sample bracket 2 and can be rotated in any direction. The sample stage 4 is a transparent glass disc-shaped recycled aggregate sample disc.

[0026] The steering ball fixedly connected to the bottom end of the high-definition camera 8 is a metal ball, and its direction can be arbitrarily changed by rotating the control knob 7, so that the shooting direction of the high-definition camera 8 is aimed at the recycled aggregate, realizing a flexible operation function.

[0027] Among them, the HD camera 8 can stably output high-quality images with 20.1 million effective pixels. Its optical zoom is 24-120mm, and its memory capacity is 64GB. It also has good device data intercommunication and transmission functions, and its battery life can support built-in lithium-ion batteries and external power supplies.

[0028] Among them, the light source type of the flash 9 is white LED, the flash index GN is 12, the flash rate is 0.004s, the working voltage is 3.7v, and the battery capacity is 1200mAh, which meets general usage conditions.

[0029] A simple evaluation method for identifying defects in recycled aggregates includes the following:

[0030] S1. Obtain high-quality image data of recycled aggregate based on a high-definition camera 8, perform secondary image recognition processing through computer equipment, obtain morphological characteristics and pore characteristics data of recycled aggregate, and provide data for subsequent evaluation and analysis of recycled aggregate defects;

[0031] S2. The method for evaluating and analyzing the morphological characteristics of recycled aggregates starts with the following reference indicators: the aspect ratio A represents the size of the recycled aggregate needles, and the It is used to calculate the aspect ratio, L is the length of the major axis of the equivalent ellipse of the recycled aggregate, and W is the width of the minor axis of the equivalent ellipse of the recycled aggregate; at the same time, the irregularity Rou is used to characterize the degree to which the recycled aggregate approaches a circle, and the To calculate, P er is the outer contour perimeter of the recycled aggregate read from the image, S is the area of ​​the recycled aggregate read from the image, and the angularity parameter AP represents the angularity of the recycled aggregate and is calculated as Among them A P is the angular parameter, P C is the perimeter of the circumscribed polygon of recycled aggregate, P E For the equivalent ellipse perimeter of the recycled aggregate, image recognition is performed on the recycled aggregate image to obtain the contour and plane basic data of the recycled aggregate, and the morphological characteristic parameters of each recycled aggregate are automatically calculated. The lower quartile and upper quartile of this group of data are used as the division range, and the recommended range of aspect ratio can be obtained: 1.2≤A≤1.5, irregularity: 0.6≤Rou≤0.8, and angular parameter 1.1≤AP≤1.2;

[0032] S3. The pores of recycled aggregate are analyzed by using the variance method to calculate the ratio of the pore area of ​​recycled aggregate to the aggregate area. Repeat several groups of images and calculate the variance values ​​of multiple groups of recycled aggregate images to obtain a reference result with small discreteness and deviation. To obtain the result with small discrete and deviation value as a reference, where σ 2 is the variance of the pore area ratio of recycled aggregate, j is the number of recycled aggregate images, M i is the pore area ratio of recycled aggregate, is the average percentage of pore area of ​​recycled aggregate;

[0033] Working principle:

[0034] The aggregate to be tested is placed on the sample table 4, and the universal joint 6 and the regulating knob 7 are adjusted at this time to ensure that the high-definition camera 8 is aimed at the material on the sample table 4. At the same time, multiple shots are taken by rotating during shooting, and the recycled aggregate data taken multiple times are integrated. The data is processed by using a computer device for secondary image recognition to obtain the morphological characteristics and pore characteristic data of the recycled aggregate, and data is provided for subsequent evaluation and analysis of recycled aggregate defects for data processing. In this way, data analysis and calculation are performed from the two aspects of morphological characteristics and pore characteristics for the later identification of recycled aggregate defects. The morphological characteristic reference index and the variance analysis method are used as methods for evaluating recycled aggregate defects respectively, and the defect characteristics of recycled aggregates from different sources can be evaluated. The equipment composition is simple, the operation is simple, the evaluation method is simple, and the results are intuitive.

[0035] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0036] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0037] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An evaluation device for simply identifying defects in recycled aggregate, comprising an arc-shaped support (1), characterized in that: A vertical support rod (101) is fixedly connected to the top of the middle part of the arc-shaped support (1), a movable clamping groove is provided in the middle of the top of the vertical support rod (101), and the vertical support rod (101) is movably clamped to the vertical clamping rod (102) through the movable clamping groove. A connecting support rod (5) is fixedly connected through one side of the middle part of the vertical support rod (101) close to the bottom end, and the connecting support rod (5) is fixedly connected to the screw anchor (10) at one end close to the arc-shaped support (1), and the connecting support rod (5) is fixedly connected to the end far from the screw anchor (10). The top of the sample bracket (2) is fixedly connected to the sample table (4). The outer wall of the bottom end of the sample holder (2) is fixedly connected to a triangular bracket (3), the top end of the vertical clamping rod (102) is fixedly connected to a universal joint (6), the outer wall of the universal joint (6) is provided with a regulating knob (7), the middle part of the universal joint (6) is provided with a groove, the top end of the universal joint (6) is provided with a high-definition camera (8), the bottom end of the high-definition camera (8) is fixedly connected to a steering ball, the universal joint (6) places the steering ball of the high-definition camera (8) in the groove and limits and steers the high-definition camera (8) by using the regulating knob (7), and the top end of the high-definition camera (8) is fixedly connected to a flashlight (9).

2. The evaluation device for simply identifying defects in recycled aggregate according to claim 1, characterized in that: The sample stage (4) has a diameter of 20 cm±1 cm. The sample stage (4) is fixed on the sample bracket (2) and can rotate in any direction.

3. The device and method for simply identifying defects in recycled aggregate according to claim 1, characterized in that: The steering ball fixedly connected to the bottom end of the high-definition camera (8) is a metal sphere, and its direction can be arbitrarily changed by rotating the control knob (7), so that the shooting direction of the image acquisition device is aimed at the recycled aggregate, realizing a flexible operation function.

4. The device and method for simply identifying defects in recycled aggregate according to claim 1, characterized in that: The high-definition camera (8) can stably output high-quality images with 20.1 million effective pixels, has an optical zoom of 24-120 mm, and a memory capacity of 64 GB.

5. The device and method for simply identifying defects in recycled aggregate according to claim 1, characterized in that: The light source type of the flash lamp (9) is a white LED, the flash index (GN) is 12, the flash rate is 0.004s, the operating voltage is 3.7v, and the battery capacity is 1200mAh, which meets general usage conditions.

6. A method for simply identifying defects in recycled aggregate, implemented in the device for simply identifying defects in recycled aggregate as claimed in claim 1, characterized in that: Includes the following: S1. Obtain high-quality image data of recycled aggregate based on a high-definition camera (8), perform secondary image recognition processing through a computer device, obtain morphological characteristics and pore characteristics data of the recycled aggregate, and provide data for subsequent evaluation and analysis of recycled aggregate defects; S2. The method for evaluating and analyzing the morphological characteristics of recycled aggregates starts with the following reference indicators: aspect ratio (A) characterizes the size of the recycled aggregate needles, and It is used to calculate the aspect ratio, L is the length of the major axis of the equivalent ellipse of the recycled aggregate, and W is the width of the minor axis of the equivalent ellipse of the recycled aggregate; at the same time, the irregularity (Rou) is used to characterize the degree to which the recycled aggregate approaches a circle, and the To calculate, P er is the outer contour perimeter of the recycled aggregate read from the image, S is the area of ​​the recycled aggregate read from the image, and the angular parameter (AP) characterizes the angularity of the recycled aggregate and is calculated as Among them A P is the angular parameter, P C is the perimeter of the circumscribed polygon of recycled aggregate, P E is the equivalent ellipse circumference of recycled aggregate; S3. The pores of recycled aggregate are analyzed by using the variance method to calculate the ratio of the pore area of ​​recycled aggregate to the aggregate area. Repeat several groups of images and calculate the variance values ​​of multiple groups of recycled aggregate images to obtain a reference result with small discreteness and deviation. To obtain the result with small discrete and deviation value as a reference, where σ 2 is the variance of the pore area ratio of recycled aggregate, j is the number of recycled aggregate images, M i is the pore area ratio of recycled aggregate, is the average pore area ratio of recycled aggregate.

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