Binding material for bridge deck pavement waterproof bonding layer and preparation method thereof

Abstract

The invention discloses a bonding material for a bridge deck pavement waterproof bonding layer. The bonding material is prepared from the following components in percentage by mass: 3% of SBR latex, 10% of F0704 waterborne epoxy resin, 5% of an F0705 curing agent and the balance of emulsified asphalt. The sum of the mass percentages of the components is 100%. The invention further relates to a preparation method of the bonding material for the bridge deck pavement waterproof bonding layer. The bonding material for the bridge deck pavement waterproof bonding layer is used for meeting the adhesion performance requirement of the bridge deck pavement waterproof bonding layer.

Description

Technical Field

[0001] The present invention belongs to the technical field of highway pavement engineering, and particularly relates to a bonding material for a waterproof bonding layer of a bridge deck pavement, and also relates to a preparation method of a bonding material for a waterproof bonding layer of a bridge deck pavement. Background Art

[0002] The types of waterproof bonding layer materials are mainly divided into three categories: emulsified asphalt, hot asphalt binder, and diluted asphalt. Among them, emulsified asphalt is a liquid at normal temperature, with advantages such as good fluidity, resource conservation, safety, and environmental protection, and is currently the most widely used type of waterproof bonding layer. Hot asphalt binder has good bonding performance and high strength, but its viscosity is greater and the construction convenience is poor. Diluted asphalt causes a large amount of resource waste and is prone to environmental pollution, and is currently basically no longer used. Based on this, emulsified asphalt is mostly used for waterproof bonding layers in actual projects.

[0003] Temperature differences caused by seasonal and day-night temperature changes have a greater impact on the performance of the bonding layer, which requires that the waterproof bonding layer itself has good high-temperature stability and low-temperature crack resistance. And in the actual use process, the performance of the waterproof bonding layer of the bridge deck pavement is affected by many factors and their interactions. For example, factors such as the dosage of the bonding layer, surface texture, and paving structure type all affect the interfacial adhesion performance between the waterproof bonding layer and the paving layer and the bridge deck pavement. In the design and construction stages, the influence of these factors on the performance of the bonding layer should be fully considered and cannot be ignored. Therefore, conventional waterproof bonding layer materials are difficult to cope with the increasing axle load and complex environmental changes.

[0004] In order to improve the interfacial bonding performance of the paving layer, some new types of waterproof bonding layer materials have been tried to develop. However, due to the material characteristics themselves and the special requirements of the bridge structure, a single modification technology is difficult to take into account functional requirements such as high-temperature stability, low-temperature crack resistance, and deformation coordination. Based on this, various new material and composite material solutions have been continuously tried to seek a better solution for performance balance. Summary of the Invention

[0005] The purpose of the present invention is to provide a bonding material for a waterproof bonding layer of a bridge deck pavement to meet the adhesion performance requirements of the waterproof bonding layer of the bridge deck pavement.

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is: the bonding material for a waterproof bonding layer of a bridge deck pavement is composed of the following components by mass percentage:

[0007] 3% SBR latex, 10% F0704 waterborne epoxy resin, 5% F0705 curing agent, and the rest is emulsified asphalt;

[0008] The sum of the mass percentages of the above components is 100%.

[0009] The present invention also provides a preparation method of a bonding material for a waterproof bonding layer of a bridge deck pavement, which is specifically implemented according to the following steps:

[0010] Step 1: Weigh according to mass percentage: 3% SBR latex, 10% F0704 waterborne epoxy resin, 5% F0705 curing agent, and 22% emulsified asphalt;

[0011] Step 2: Stir the emulsified asphalt evenly and place it in a beaker for standby;

[0012] Step 3: Add the SBR latex to the emulsified asphalt obtained in Step 1 and stir evenly with a glass rod to obtain a mixture A;

[0013] Step 4: Place the mixture A in Step 3 in a shear mixer and stir evenly to obtain SBR latex-modified emulsified asphalt;

[0014] Step 5: Mix the F0704 waterborne epoxy resin and the F0705 curing agent evenly and stir until it becomes viscous to obtain a mixture B;

[0015] Step 6: Add the mixture B to the SBR latex-modified emulsified asphalt and stir evenly to obtain a bonding material for a waterproof bonding layer of a bridge deck pavement.

[0016] As a preferred technical solution of the present invention, a dropper is used to add the SBR latex to the emulsified asphalt in the step.

[0017] As a preferred technical solution of the present invention, in Step 3 and Step 5, the stirring speed is 5000 r / min and the time is 10 min.

[0018] As a preferred technical solution of the present invention, Step 5 is carried out at 25 °C.

[0019] The beneficial effects of the present invention are as follows: (1) The present invention innovatively uses waterborne epoxy resin and SBR latex to compound-modify emulsified asphalt, significantly improving the interlayer bonding performance of the waterproof bonding layer. This technology not only enhances the adhesion between the bridge deck pavement and the asphalt mixture layer, but also improves the shear strength and durability of the material, effectively solving the problems of insufficient interlayer bonding and poor comprehensive performance of ordinary emulsified asphalt in bridge deck pavements; (2) Through systematic experimental research, the present invention deeply reveals the strengthening mechanism of the compound-modified emulsified asphalt and the change law of its shear strength under different influencing factors. The research results provide a scientific basis for the optimized design of the bridge deck waterproof bonding layer, promote the progress of construction technology, and at the same time provide an economic, efficient and environmentally friendly new waterproof bonding material solution for similar projects. Specific Embodiments

[0020] The technical solution of the present invention will be further described in detail below in conjunction with specific embodiments.

[0021] A preparation method of a bonding material for a waterproof bonding layer of a bridge deck pavement specifically comprises the following steps:

[0022] Step 1: Weigh according to mass percentage: 3% SBR latex, 10% F0704 waterborne epoxy resin, 5% F0705 curing agent, and 22% emulsified asphalt;

[0023] Step 2: Stir the emulsified asphalt evenly and place it in a beaker for standby;

[0024] Step 3: Add the SBR latex to the emulsified asphalt obtained in Step 1 and stir evenly with a glass rod to obtain mixture A;

[0025] Step 4: Place mixture A in a shear machine and stir at a speed of 5000 r / min for 10 min to obtain SBR latex-modified emulsified asphalt;

[0026] Step 5: Mix the F0704 waterborne epoxy resin and the F0705 curing agent evenly and stir until it becomes viscous to obtain mixture B;

[0027] Step 6: Add mixture B to the SBR latex-modified emulsified asphalt at 25°C and stir evenly to obtain the bonding material for the waterproof bonding layer of the bridge deck pavement.

[0028] The asphalt mixture prepared by the above method is subjected to performance tests according to the current domestic standard "Test Procedures for Bitumen and Bituminous Mixtures in Highway Engineering" (JTG E20 - 2011), ASTM - D4123, ASTM - D570, and AASHTO - T283:

[0029] Test items:

[0030] Test Items Heat Resistance Heat Resistance Test (80°C; 5h) Low Temperature Flexibility Low Temperature Flexibility Test (-15°C; 2h) Water Impermeability Water Impermeability Test (500ml; 30min) Acid and Alkali Resistance Acid and Alkali Resistance Test (400ml; 168(±1)h)

[0031] In summer, the bridge deck pavement is affected by high solar radiation, and the asphalt pavement is prone to generate a lot of heat. This heat is transferred between layers and affects the interlayer bonding of the pavement. At higher temperatures, the waterproof bonding layer may deform due to insufficient heat resistance. In this study, the heat resistance of the composite modified emulsified asphalt coating was tested, and three parallel test samples were set for each emulsified asphalt. The test process is as follows: a perforated paint test grade tinplate sheet (120mm×50mm×0.28mm) was selected, and the prepared composite modified emulsified asphalt was applied to the tinplate sheet at a coating amount of 0.8kg / m2 in three times (until the surface is close to the surface dry state), and the coating thickness was 1.5±0.2mm. The tinplate sheet coated with emulsified asphalt was then cured at 25℃ for 120h and cured in an oven at 40℃ for 48h. Finally, the cured specimens were hung vertically with wire in an oven at 80°C for 5 hours to observe whether the asphalt emulsion on the surface of the tinplate sheet had any flowing, sliding, dripping, etc., so as to determine the heat resistance of the composite modified emulsified asphalt.

[0032] The preparation and curing process of the low-temperature flexibility test samples of water-based epoxy / SBR composite modified emulsified asphalt are consistent with those in the heat resistance test. The difference is that the specifications of the tinplate sheets used in the low-temperature flexibility test are 100mm×25mm×0.28mm. Subsequently, the cured samples were placed in a refrigerator at -15°C together with an iron rod with a diameter of about 15mm and frozen for 2 hours. Finally, the frozen samples were taken out of the refrigerator and immediately wrapped evenly around the iron rod 360° to observe whether there were brittle fractures, cracks, etc. on the surface of the specimens. Three parallel samples were set for each emulsified asphalt.

[0033] In addition, in order to ensure the same coating amount for each emulsified asphalt control group, a rutting board size (300mm×300mm) was first selected on the kraft paper, and the emulsified asphalt was evenly applied on the kraft paper at a coating amount of 0.8kg / m2. After the emulsified asphalt sample was completely dry, a pavement water permeability meter was used and the water level was added to 0ml. After standing for 30 minutes, the water column level change of the pavement water permeability meter and the water seepage around the kraft paper were observed to evaluate the impermeable performance of the composite modified emulsified asphalt. Three parallel samples were prepared for each emulsified asphalt.

[0034] The sample preparation method for the acid and alkali corrosion resistance test of the waterproof bonding layer is the same as that for the low temperature flexibility test. In addition, about 400 ml of acid and alkali solutions are respectively prepared at 23 (±2) °C. The acid solution uses a H2SO4 solution with a concentration of 2%. The alkali solution is a 0.1% NaOH solution added with supersaturated Ca(OH)2. The test process is as follows: Place 3 parallel specimens after curing in the acid or alkali solution (about 400 ml) and soak for 168 (±1) h, ensuring that the liquid level is more than 10 mm above the specimen; after soaking, take out, wash clean with deionized water, dry, place in an oven at 25 °C for 4 h, then place in an oven at 60 °C for 6 h; finally, place in an oven at 25 °C for 18 h, and observe whether there are abnormal phenomena such as grooves, peeling, and blistering on the surface of the specimen.

[0035] The test results are as follows:

[0036] (1) Heat resistance study:

[0037]

[0038]

[0039] It can be seen from the test results and comparison results that the heat resistance performance of the original emulsified asphalt is significantly poor, and obvious flowing, sliding, and dripping phenomena occur when heated at 80 °C for 5 h. However, the compound modified emulsified asphalt with 3% SBR + 15% WER does not show flowing, sliding, and dripping phenomena when heated at 80 °C for 5 h. It can be known that the incorporation of SBR and WER can effectively improve the heat resistance performance of emulsified asphalt.

[0040] (2) Low temperature flexibility study:

[0041] Serial Number Specimen Name Sample 1 Sample 2 Sample 3 1 Original Emulsified Asphalt Brittle Fracture Crack Brittle Fracture 2 3% SBR + 15% WER No Brittle Fracture, No Crack No Brittle Fracture, No Crack No Brittle Fracture, No Crack

[0042] It can be seen from the test results and comparison results that after freezing at -15 °C, all three samples of the original emulsified asphalt showed brittle fracture, cracks, etc., indicating that the low temperature flexibility performance of the original emulsified asphalt is poor. In contrast, all the specimens of the compound modified emulsified asphalt with 3% SBR + 15% WER have no brittle fracture and no cracks. Compared with the original emulsified asphalt, the compound modified emulsified asphalt with 3% SBR + 15% WER improves its low temperature flexibility performance.

[0043] (3) Water impermeability study

[0044] Serial Number Specimen Name Test Results of Water Resistance (3 Parallel Specimens) 1 Original Emulsified Asphalt No Change in Liquid Level, No Water Seepage around Kraft Paper 2 3% SBR + 15% WER No Change in Liquid Level, No Water Seepage around Kraft Paper

[0045] It can be seen from the test results and comparison results that the composite modified emulsified asphalt with 3% SBR + 15% WER can keep the water column level unchanged within 30 minutes by the pavement permeameter, and no wetting condition caused by water seepage is observed around the kraft paper. This indicates that the composite modified emulsified asphalt has good impermeability, can effectively isolate the scouring of the water seeping from the paving layer to the bridge deck paving, and meets the impermeability performance requirements of the waterproof bonding layer of the bridge deck paving.

[0046] (IV) Research on acid and alkali corrosion resistance

[0047]

[0048]

[0049] It can be seen from the test results and comparison results that whether it is the original emulsified asphalt or the composite modified emulsified asphalt, after being soaked in acid or alkali solution for 168 hours, the surface of the specimen can remain normal without abnormal phenomena such as grooves, peeling and blistering, indicating that the waterproof bonding material can resist the erosion of acid or alkali for a certain period of time and maintain the stability of its own properties, and can meet the acid and alkali corrosion resistance performance requirements of the waterproof bonding layer of the bridge deck paving.

[0050] The above description shows and describes several preferred embodiments of the invention. However, as mentioned above, it should be understood that the invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the inventive concept described herein through the above teachings or the technology or knowledge in the relevant field. And any changes and variations made by those skilled in the art without departing from the spirit and scope of the invention shall fall within the protection scope of the appended claims of the invention.

Claims

1. A bonding material for a bridge deck paving waterproof bonding layer, characterized in that: The composition is as follows according to mass percentage: 3% SBR latex, 10% F0704 water-based epoxy resin, 5% F0705 curing agent, and the rest is emulsified asphalt; The sum of the mass percentages of the above components is 100%.

2. A method for preparing a bonding material for a bridge deck paving waterproof bonding layer, characterized in that: Follow the steps below to implement it: Step 1, weighing according to mass percentage: 3% SBR latex, 10% F0704 water-based epoxy resin, 5% F0705 curing agent, 22% emulsified asphalt; Step 2, stir the emulsified asphalt evenly and place it in a beaker for later use; Step 3, adding SBR latex to the emulsified asphalt obtained in step 1, and stirring evenly with a glass rod to obtain a mixture A; Step 4, placing the mixture A in step 3 in a shearing machine and stirring it evenly to obtain an SBR latex-modified emulsified asphalt; Step 5, mix F0704 waterborne epoxy resin and F0705 curing agent evenly, and stir until they become viscous to obtain mixture B; Step 6, adding mixture B into the SBR latex-modified emulsified asphalt, stirring evenly, and obtaining a bonding material for a bridge deck paving waterproof bonding layer.

3. The method for preparing the adhesive material for the bridge deck pavement waterproof adhesive layer according to claim 2, characterized in that: Use a rubber-tipped dropper to add the SBR latex to the emulsified asphalt in step 1.

4. The method for preparing the adhesive material for the bridge deck pavement waterproof adhesive layer according to claim 3, characterized in that: In step 4 and step 6, the stirring speed is 5000 r / min and the stirring time is 10 min.

5. The method for preparing the adhesive material for the bridge deck pavement waterproof adhesive layer according to claim 4, characterized in that: The step 6 was carried out at 25°C.

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