Cement concrete bridge deck treatment cleanliness testing device and evaluation method

Abstract

The invention belongs to the technical field of road detection and evaluation, particularly relates to a cement concrete bridge deck treatment cleanliness testing device and an evaluation method, and provides the cement concrete bridge deck treatment cleanliness testing device and the evaluation method, so that quantitative characterization of the base surface cleanliness after cement concrete bridge deck treatment is realized. The testing device is simple in structure, easy and convenient to operate and easy for engineering implementation, whether the bridge surface treatment meets the requirement or not can be effectively judged by testing the cleanliness of the base surface after bridge surface treatment through the cleanliness testing device and the evaluation method, optimization of the bridge surface treatment process can be guided, bonding between the bridge surface and an asphalt pavement layer is improved, and the service life of the bridge surface is prolonged. And the method has obvious significance in improving the service performance and prolonging the service life of the bridge deck pavement structure.

Description

Technical Field

[0001] The invention belongs to the technical field of road detection and evaluation, and in particular relates to a cement concrete bridge deck treatment cleanliness testing device and an evaluation method. Background Art

[0002] Engineering practice shows that the failure of bonding between cement concrete bridge deck and asphalt pavement is one of the important reasons for bridge deck pavement damage. In order to ensure the effective bonding between cement concrete bridge deck and asphalt layer, in addition to selecting bonding layer materials with excellent bonding performance, the engineering also uses fine milling, chiseling, shot blasting and other methods to treat the cement concrete bridge deck, hoping to obtain a rough and clean base surface to ensure the bonding with the bonding layer material.

[0003] The requirements for bridge deck treatment include at least two aspects: roughness and cleanliness. Roughness is usually characterized by structural depth, and the detection method is the standard test method - sand spreading method; while there is currently no standard quantitative detection method for cleanliness, and it is generally judged subjectively by visual inspection or finger touch, which makes it difficult to effectively control the cleanliness of the bridge deck after treatment, thereby affecting the bonding performance between the cement concrete bridge deck and the asphalt layer. Summary of the invention

[0004] In view of the current situation that the prior art lacks a method for detecting and evaluating the cleanliness of cement concrete bridge deck treatment, the present invention aims to overcome this situation and provide a cement concrete bridge deck treatment cleanliness testing device and evaluation method to achieve accurate quantitative evaluation of the cleanliness of cement concrete bridge deck after treatment.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical solution: A cement concrete bridge deck treatment cleanliness test device, comprising a fixed base, a pressurization system, a temperature control system, a heating device, a detection plate and an adhesive layer;

[0006] The detection plate is arranged on a fixed base so as to be movable up and down, the detection plate is made of a heat-conducting material, and the adhesive layer is detachably arranged on the detection plate;

[0007] The pressurizing system is used to pressurize the detection plate;

[0008] The detection board is provided with a heating device, and the temperature control system is used to control the heating temperature of the heating device.

[0009] Preferably, the heating device comprises a heating resistor embedded in the detection board. The detection board is heated by the heating resistor embedded in the detection board, which has the characteristic of fast heating speed.

[0010] Preferably, the heating device comprises an electric heating film arranged on the surface of the detection plate. The detection plate is heated by the electric heating film arranged on the surface of the detection plate, which has the characteristic of uniform heating and ensures that the adhesive layer is evenly heated.

[0011] Preferably, in the present invention, the adhesive layer is a polyethylene anti-corrosion tape or a polyethylene protective tape.

[0012] The present invention also discloses a method for evaluating the cleanliness of cement concrete bridge deck treatment, which uses the above-mentioned cement concrete bridge deck treatment cleanliness testing device and comprises the following steps:

[0013] S1, cutting the adhesive layer and weighing the initial mass, which is calculated as m0; the size of the cut adhesive layer ensures that the edge of the adhesive layer is located inside the test board, that is, the size of the adhesive layer is less than or equal to the size of the test board;

[0014] S2. Select a test point on the treated cement concrete bridge deck to be tested, and fix the fixed base to the cement concrete bridge deck to be tested;

[0015] S3, tightly fixing the adhesive layer and the test plate, and pre-pressing the test plate at the test point selected in step S2, the purpose of pre-pressing is to make the adhesive material on the adhesive layer pre-contact with the surface to be tested;

[0016] S4, turn on the heating device to heat the detection plate to a preset temperature T;

[0017] S5, pressurizing the test plate using a pressurizing system so that the load between the test plate and the test point reaches a preset pressure P1, and maintaining the pressure for a preset time T1;

[0018] S6, unload the test board, turn off the heating device, remove the adhesive layer from the test board, cool it to room temperature, weigh the mass, and calculate it as m1;

[0019] S7. Calculate the cleanliness of bridge deck treatment D:

[0020] D = (m1-m0)*100% / m0.

[0021] Preferably, the present invention further includes step S8: setting a bridge deck treatment cleanliness threshold D1, and when the bridge deck treatment cleanliness D calculated in step S7 is greater than D1, cleaning the cement concrete bridge deck to be tested, and repeating steps S1 to S7 until the bridge deck treatment cleanliness D calculated in step S7 is less than or equal to D1. By setting the bridge deck treatment cleanliness threshold D1, it is possible to quantitatively judge the bridge deck treatment cleanliness, control the bridge deck treatment cleanliness within a reasonable range, and improve the service performance and service life of the bridge deck pavement structure.

[0022] Preferably, in step S3, the preloading load range is 0.07MPa to 0.1MPa, and the load holding time is from the start of preloading to the heating temperature of the test plate meeting the requirements. The purpose of preloading is to allow the adhesive material to pre-contact the test surface, and the preloading pressure is usually 10% to 15% of the formal test pressure.

[0023] Preferably, in step S4, the preset temperature T is at least 60°C. The bonding ability of the adhesive layer is closely related to the temperature, and generally the higher the temperature, the stronger the bonding ability. The adhesive material is heated to at least 60°C, because 60°C is a representative temperature for high temperature in the highway industry, which is more in line with actual construction conditions.

[0024] Preferably, in step S5, the preset pressure P1 is at least 0.7 MPa, and the preset time T1 is at least 45 s.

[0025] 0.7MPa is the representative load in this industry. The accuracy of the test is ensured by controlling the minimum value of the preset pressure and the test time.

[0026] Preferably, the adhesive layer has a 180° peel strength of 1.60 N / 10 mm to 2.40 N / 10 mm at 23°C;

[0027] The adhesive layer can be peeled off normally without any adhesive residue after being kept at 70℃ for 12 hours. By limiting the peeling performance of the adhesive layer, it is ensured that the adhesive material on the adhesive layer will not be stuck to the bridge surface during the test, which will affect the measurement accuracy.

[0028] The inventive concept of the present invention is as follows: During the actual construction process, there are free impurities on the cement concrete bridge deck and impurities attached to the surface of the cement concrete bridge deck with insufficient bonding strength. Both of the above impurities will affect the bonding effect between the cement concrete bridge deck and the asphalt pavement layer. Therefore, the present invention arranges a heating device on the detection plate and uses a pressurizing system to pressurize the detection plate so that the adhesive layer is in close contact with the cement concrete bridge deck. Under high temperature, the free impurities on the cement concrete bridge deck and the impurities attached to the surface of the cement concrete bridge deck with insufficient bonding strength can be removed, thereby realizing accurate detection of the cleanliness of the cement concrete bridge deck treatment.

[0029] The adhesive layer is detachably arranged on the test board to facilitate the measurement of the weight of the adhesive layer before and after the test, thereby achieving the purpose of evaluating the cleanliness of the cement concrete bridge deck treatment.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides a cement concrete bridge deck treatment cleanliness test device and evaluation method, which realizes the quantitative characterization of the base surface cleanliness after the cement concrete bridge deck treatment. The test device of the present invention has a simple structure, is easy to operate, and is easy to implement in engineering. The cleanliness test device and evaluation method provided by the present invention are used to test the base surface cleanliness after the bridge deck treatment, which can effectively determine whether the bridge deck treatment meets the requirements, and can also guide the optimization of the bridge deck treatment process, thereby improving the bonding between the bridge deck and the asphalt pavement layer, which has a significant significance for improving the service performance and service life of the bridge deck pavement structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the cement concrete bridge deck treatment cleanliness testing device of the present invention;

[0032] In the figure, 100 is a fixed base;

[0033] 1 detection plate, 2 adhesive layer, 3 hydraulic rod, 4 output hydraulic cylinder, 5 liquid storage tank, 51 pressure gauge;

[0034] 6 input hydraulic cylinder, 7 power supply. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0036] The present invention only considers the dust, sand and gravel particles and other pollutants remaining after the bridge deck treatment, and does not consider the impact of oil pollution. Bridge deck treatment is different from road pollution, and basically there will be no oil pollution, and even if there is, it will be treated by roughening and shot blasting.

[0037] like Figure 1 As shown, this embodiment is a cement concrete bridge deck treatment cleanliness test device, including a fixed base 100, a pressurizing system, a temperature control system, a heating device, a detection plate 1 and an adhesive layer 2. The pressurizing system and the temperature control system are both arranged on the fixed base 100 for easy transportation.

[0038] The detection plate 1 can be moved up and down on the fixed base 100, the detection plate 1 is a heat-conducting material, and the adhesive layer 2 is detachably arranged on the detection plate 1, and the adhesive layer 2 is also a heat-conducting material. In this embodiment, the detection plate 1 is a stainless steel rectangular plate with a size of 10cm*7.5cm*0.5cm. The thickness of the adhesive layer 2 is 0.8mm and the width is 7.5cm. The thickness of the adhesive layer 2 should be satisfied that it will not be broken under a pressure of 0.7MPa and will not leave glue at 60°C, that is, it can only stick to the pollutants on the bridge deck, and the adhesive material cannot remain on the bridge deck.

[0039] The pressurizing system is used to pressurize the detection board 1. Specifically, Figure 1 As shown, the pressurizing system includes an output hydraulic cylinder 4, a liquid storage tank 5, and an input hydraulic cylinder 6 connected in sequence, the liquid storage tank 5 is provided with a pressure gauge 51, and the hydraulic rod 3 of the output hydraulic cylinder 4 is rigidly connected to the detection plate 1. The input hydraulic cylinder 6 is provided with a pressurizing handle, and the detection plate 1 is pressurized by the pressurizing handle, and the pressure between the detection plate 1 and the road surface to be tested is determined by observing the value of the pressure gauge 51. In this embodiment, the fixed base 100 is an arch bracket, the output hydraulic cylinder 4 is vertically arranged above the arch bracket, and the detection plate 1 is arranged below the arch bracket.

[0040] The detection board 1 is provided with a heating device, and the temperature control system is used to control the heating temperature of the heating device. Figure 1 As shown, in this embodiment, a power supply 7 connected to the heating device is also provided for supplying power to the heating device.

[0041] The heating device includes a heating resistor embedded in the detection board 1 to achieve accurate heating of the detection board 1 , and is equipped with a temperature display to determine the real-time temperature of the detection board 1 .

[0042] The adhesive layer 2 is a polyethylene anti-corrosion tape or a polyethylene protective tape.

[0043] A method for evaluating the cleanliness of cement concrete bridge deck treatment, using the above-mentioned cement concrete bridge deck treatment cleanliness testing device, comprises the following steps:

[0044] S1. Cut the adhesive layer 2 and weigh the initial mass, which is m0. The size and shape of the adhesive layer 2 are the same as those of the test board 1. Use an electronic balance to weigh with an accuracy of 0.01g.

[0045] S2. Select a test point on the treated cement concrete bridge deck to be tested, and fix the fixed base 100 to the cement concrete bridge deck to be tested. Specifically, a through fixing hole is set on the fixed base 100, and the fixed base 100 is fixed to the cement concrete bridge deck to be tested by bolts or rivets.

[0046] In this embodiment, the 180° peel strength of the adhesive layer 2 at 23° C. is 1.60 N / 10 mm to 2.40 N / 10 mm.

[0047] After 12 hours at 70°C, the adhesive tape can be peeled off from the test board 1 normally without any adhesive residue. The 180° peel strength is tested using the 180° peel strength test method, which is used to measure the bonding strength and durability of adhesive products. During the test, the adhesive tape is adhered to the standard test board, then quickly peeled off at an angle of 180°, and the required force is measured.

[0048] S3, tightly fix the adhesive layer 2 and the test board 1, and pre-press the test board to the test point selected in step S2.

[0049] S4, turning on the heating device to heat the detection plate 1 to a preset temperature T.

[0050] S5. Use the pressurizing system to pressurize the detection plate 1 so that the load between the detection plate 1 and the test point reaches a preset pressure P1 and is maintained for a preset time T1.

[0051] S6. Unload the test board 1, turn off the heating device, remove the adhesive layer 2 from the test board 1, cool it to room temperature, and weigh the mass, which is m1.

[0052] S7. Calculate the cleanliness of bridge deck treatment D:

[0053] D = (m1-m0)*100% / m0.

[0054] The method for evaluating the cleanliness of cement concrete bridge deck treatment also includes step S8: setting a bridge deck treatment cleanliness threshold D1. When the bridge deck treatment cleanliness D calculated in step S7 is greater than D1, the cement concrete bridge deck to be tested is cleaned, and steps S1 to S7 are repeated until the bridge deck treatment cleanliness D calculated in step S7 is less than or equal to D1.

[0055] In step S3, the pre-pressing load range is 0.07 MPa to 0.1 MPa, and the load holding time is from the start of pre-pressing to the heating temperature of the detection plate 1 meeting the requirement.

[0056] In this embodiment, in step S4, the preset temperature T is 60°C.

[0057] In this embodiment, in step S5, the preset pressure P1 is 0.7 MPa, and the preset time T1 is 45 s.

[0058] Example 2

[0059] The difference from Example 1 is that the heating device includes an electric heating film arranged on the surface of the detection plate 1.

[0060] In this embodiment, the detection plate 1 can also be detachably arranged under the hydraulic rod 3 by means of fasteners such as bolts, and the detection plate 1 and the adhesive layer 2 can be weighed together to improve the test efficiency.

Claims

1. A cement concrete bridge deck treatment cleanliness test device, characterized in that: It comprises a fixed base (100), a pressurizing system, a temperature control system, a heating device, a detection plate (1) and an adhesive layer (2); The detection plate (1) is arranged on the fixed base (100) so as to be movable up and down, the detection plate (1) is made of a heat-conducting material, and the adhesive layer (2) is detachably arranged on the detection plate (1); The pressurizing system is used to pressurize the detection plate (1); The detection plate (1) is provided with a heating device, and the temperature control system is used to control the heating temperature of the heating device.

2. The cement concrete bridge deck treatment cleanliness testing device according to claim 1, characterized in that: The heating device comprises a heating resistor embedded in the detection board (1).

3. The cement concrete bridge deck treatment cleanliness testing device according to claim 1, characterized in that: The heating device comprises an electric heating film arranged on the surface of the detection plate (1).

4. The cement concrete bridge deck treatment cleanliness testing device according to claim 1, characterized in that: The adhesive layer (2) is a polyethylene anti-corrosion tape or a polyethylene protective tape.

5. A method for evaluating the cleanliness of cement concrete bridge deck treatment, characterized in that: The cement concrete bridge deck treatment cleanliness testing device according to any one of claims 1 to 4 comprises the following steps: S1, cutting the adhesive layer (2) and weighing the initial mass, which is calculated as m0; S2, selecting a test point on the treated cement concrete bridge deck to be tested, and fixing the fixed base (100) to the cement concrete bridge deck to be tested; S3, tightly fixing the adhesive layer (2) and the test board (1), and pre-pressing the test board to the test point selected in step S2; S4, turning on the heating device to heat the detection plate (1) to a preset temperature T; S5, using a pressurizing system to pressurize the test plate (1) so that the load between the test plate (1) and the test point reaches a preset pressure P1, and maintaining the pressure for a preset time T1; S6, unloading the test plate (1), turning off the heating device, removing the adhesive layer (2) from the test plate (1), cooling it to room temperature, and weighing the mass, which is calculated as m1; S7. Calculate the cleanliness of bridge deck treatment D: D = (m1-m0)*100% / m0.

6. The method for evaluating the cleanliness of cement concrete bridge deck treatment according to claim 5, characterized in that: It also includes step S8: setting a bridge deck treatment cleanliness threshold D1. When the bridge deck treatment cleanliness D calculated in step S7 is greater than D1, the cement concrete bridge deck to be tested is cleaned, and steps S1 to S7 are repeated until the bridge deck treatment cleanliness D calculated in step S7 is less than or equal to D1.

7. The method for evaluating the cleanliness of cement concrete bridge deck treatment according to claim 5, characterized in that: In step S3, the pre-pressing load range is 0.07MPa to 0.1MPa, and the load holding time is from the start of pre-pressing to the heating temperature of the detection plate (1) meeting the requirements.

8. The method for evaluating the cleanliness of cement concrete bridge deck treatment according to claim 5, characterized in that: In step S4, the preset temperature T is at least 60°C.

9. The method for evaluating the cleanliness of cement concrete bridge deck treatment according to claim 5, characterized in that: In step S5, the preset pressure P1 is at least 0.7 MPa, and the preset time T1 is at least 45 s.

10. The method for evaluating the cleanliness of cement concrete bridge deck treatment according to claim 5, characterized in that: The adhesive layer (2) has a 180° peel strength of 1.60 N / 10 mm to 2.40 N / 10 mm at 23°C; It can be peeled off normally without any glue residue after being kept at 70℃ for 12h.

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