Cement concrete bridge deck waterproof bonding coating and preparation method thereof

Abstract

The invention discloses a cement concrete bridge deck waterproof bonding coating and a preparation method thereof, and belongs to the technical field of high polymer materials. According to the invention, the problems of how to prevent the waterproof bonding coating from bonding wheels in concrete bridge deck pavement, improve the bonding waterproof performance of the waterproof bonding coating and shorten the curing time are solved. The preparation raw materials comprise emulsified asphalt, neoprene latex and water-based tackifying resin, and the mass ratio of the emulsified asphalt to the neoprene latex to the water-based tackifying resin is (45-55): (40-50): (5-10). The emulsified asphalt is obtained by taking a mixture of heavy traffic petroleum asphalt and hard asphalt as a matrix and modifying the matrix through low-density polyethylene and a cationic emulsifier. According to the invention, the bonding, waterproof, durable, quick-cracking and quick-setting properties and the like of the waterproof bonding coating for the cement concrete bridge floor are improved from multiple aspects.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology, specifically relating to a waterproof adhesive coating for cement concrete bridge decks and its preparation method. Background Technology

[0002] With the rapid development of infrastructure construction, the number of bridges has increased rapidly. These bridges are mainly cement concrete bridges. The pavement structure of cement concrete bridges typically consists of a cement concrete deck, a waterproof bonding layer, and an asphalt mixture pavement layer. Due to the significant material differences between the cement concrete and the upper asphalt concrete layer, bonding between them is difficult, making them extremely prone to misalignment under horizontal vehicle loads. Furthermore, because of the voids in the asphalt mixture pavement layer, rainwater and other liquids can easily seep into the internal structure during actual operation. To protect the concrete bridge deck from corrosion by such liquids, [measures are needed]. The service life of a concrete bridge deck is also greatly affected by the waterproofing between the concrete bridge deck and the asphalt pavement layer. Therefore, the research and application of high-performance waterproofing adhesives for cement concrete bridge decks are crucial. These high-performance adhesives can tightly bond the concrete bridge deck to the asphalt pavement layer, effectively preventing water or corrosive liquids from seeping into the pavement layer and flowing into the concrete bridge deck, thus preventing more serious damage such as bridge pumping. High-performance waterproofing adhesives for cement concrete bridge decks can significantly extend the service life of cement concrete bridge decks, improve bridge safety, and have significant economic and social value.

[0003] Currently, there are many types of waterproof bonding materials used in cement concrete bridge deck paving. The most common types are hot-melt modified asphalt (various types of modified asphalt), water-based polymer modified asphalt (mainly modified emulsified asphalt), reactive polymer (high molecular polymers formed through chemical reactions), and asphalt-based waterproof membranes (sheet waterproof materials made from modified asphalt as a base material). Hot-melt modified asphalt is widely used as a waterproofing adhesive in engineering projects due to its low material cost, high bonding strength at room temperature, and good water resistance. However, its properties change significantly with temperature, making it extremely unstable and complex to apply. The heating process further complicates its application. Reactive polymer materials exhibit extremely stable performance under temperature variations. The chemical reaction between materials greatly enhances their bonding and water resistance, resulting in excellent performance. However, their high price and complex construction process significantly reduce their practical application. Asphalt-based waterproof membranes offer strong water resistance and water damage resistance, but their bonding effect and high-temperature stability are less than satisfactory. They are also expensive. Water-based polymer-modified asphalt is widely used as a waterproofing adhesive in bridge deck paving due to its strong bonding strength, water resistance, low cost, and convenient construction. However, it still suffers from poor high-temperature stability and water damage resistance.

[0004] In summary, no optimal solution has been found for the application of waterproof adhesive materials in concrete bridge deck paving. How to solve the problem of waterproof adhesive coating sticking to wheels in concrete bridge deck paving, improve the adhesion and waterproof performance of waterproof adhesive coating, and reduce curing time are problems that need to be solved in this field. Summary of the Invention

[0005] To address the existing problems of how to prevent waterproof adhesive coatings from sticking to wheels during concrete bridge deck paving, improve the bonding and waterproofing performance of waterproof adhesive coatings, and reduce curing time, this invention provides a waterproof adhesive coating for cement concrete bridge decks and its preparation method.

[0006] The technical solution adopted in this invention is as follows:

[0007] A waterproof adhesive coating for cement concrete bridge decks, the raw materials for which are prepared include: emulsified asphalt, chloroprene latex and water-based tackifying resin, and the ratio of emulsified asphalt: chloroprene latex: water-based tackifying resin by mass is 45~55: 40~50: 5~10.

[0008] The emulsified asphalt is obtained by modifying the matrix with a mixture of heavy cross-linked petroleum asphalt and hard asphalt, and by using low-density polyethylene and cationic emulsifier.

[0009] By adopting this technical solution, the present invention first uses a mixture of heavy-duty petroleum asphalt and hard asphalt as the matrix, enabling the coating to initially possess a certain anti-sticking effect while maintaining a certain strength. Secondly, low-density polyethylene is incorporated into the asphalt matrix. After melting at high temperatures, the low-density polyethylene forms a continuous phase, filling the voids in the asphalt and making the asphalt more compact, thereby increasing its viscosity, raising the asphalt softening point, and improving its high-temperature stability. Simultaneously, the chemical inertness of low-density polyethylene can block the penetration of ultraviolet light and oxygen, slowing down the asphalt oxidation rate and delaying hardening and cracking. The toughness of the low-density polyethylene absorbs cyclic load energy, delaying micro-cracking. The invention utilizes low-density polyethylene (LDPE), which is harder than SBS and SBR modifiers, to prevent emulsified asphalt from sticking to wheels and being carried away by construction vehicles, thus damaging the waterproof bonding layer. Emulsification is performed using a cationic fast-setting emulsifier, ensuring the demulsification speed of the waterproof bonding material and guaranteeing emulsification stability while significantly improving construction speed. After emulsification, chloroprene latex and water-based tackifying resin are incorporated. The polar groups in the water-based tackifier penetrate into the micropores of the concrete, forming a tenon-and-mortise structure, thereby improving the adhesion between the concrete and asphalt interface. Chloroprene latex enhances the film-forming waterproofing effect of the waterproof bonding coating while further reducing its temperature sensitivity. In summary, this invention improves the adhesion, waterproofing, durability, and fast-setting properties of the waterproof bonding coating for cement concrete bridge decks from multiple perspectives.

[0010] As a preferred option, based on the total mass of the matrix, the amount of heavy-grade petroleum asphalt is 90-92%, and the amount of hard asphalt is 8-10%.

[0011] Preferably, the mass of low-density polyethylene is 2-3% of the mass of the matrix.

[0012] Preferably, the cationic emulsifier is used in a mass ratio of 0.5% to 1.5% of the total mass of low-density polyethylene and matrix.

[0013] Preferably, the waterborne tackifying resin is one of waterborne rosin ester resin, waterborne epoxy resin, and waterborne acrylic copolymer.

[0014] Preferably, the cationic emulsifier is a fast-setting and fast-coagulating cationic emulsifier, which is obtained by compounding one or two of hexadecyltrimethylammonium bromide, dodecylammonium chloride and hydroxyamide.

[0015] A method for preparing a waterproof adhesive coating for cement concrete bridge decks includes the following steps:

[0016] S1. Preparation of emulsified asphalt:

[0017] S101. By heating, heavy cross-linked petroleum asphalt and hard asphalt are brought into a fluid state, and the two are mixed in the fluid state to obtain blended asphalt;

[0018] S102. Mix blended asphalt with low-density polyethylene, and then use high-temperature shearing to melt the low-density polyethylene into the blended asphalt to obtain modified asphalt.

[0019] S103. The modified asphalt is heated and emulsified by adding a cationic emulsifier to obtain emulsified asphalt.

[0020] S2. Mix emulsified asphalt, chloroprene latex, and water-based tackifying resin according to the specified ratio to form the waterproof adhesive coating for cement concrete bridge decks.

[0021] Preferably, in step S102, the blended asphalt is heated to 175-180°C before low-density polyethylene is added to the blended asphalt, and then sheared at a speed of 4900-5100 r / min to dissolve the low-density polyethylene into the blended asphalt.

[0022] Preferably, in S103, the modified asphalt is heated to 170-180℃, then the cationic emulsifier is dissolved in water, the pH is adjusted to 1.8-2.2, and the temperature is controlled to 60℃ to obtain a cationic emulsifier solution. The cationic emulsifier solution is added to the emulsifying asphalt machine, and then the modified asphalt is slowly added to the emulsifying asphalt machine for emulsification to obtain emulsified asphalt.

[0023] Preferably, in step S2, the materials are mixed and stirred at a stirring speed of 750-850 r / min for 15-25 min to form a waterproof adhesive coating for cement concrete bridge deck.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0025] 1. In the preparation of emulsified asphalt, this invention involves mixing heavy-duty asphalt and hard asphalt in a certain proportion, and then adding 2% to 3% low-density polyethylene to the mixed asphalt. This forms a cross-linked network within the mixed asphalt, improving the high-temperature stability, anti-aging properties, and mechanical properties of the asphalt. Simultaneously, it enables the emulsified asphalt to have a non-sticking function. Compared to the previous method of adding styrene-butadiene block polymers, this emulsified asphalt does not contain butadiene soft segments, resulting in a better non-sticking effect.

[0026] 2. This invention uses cationic emulsifiers to emulsify modified asphalt, resulting in waterproof coatings with shorter surface drying and hard drying times.

[0027] 3. The waterproof coating of the present invention is formed by compounding emulsified asphalt, chloroprene latex and water-based tackifying resin. The polymer can form a continuous cross-linked structure therein, and the tackifying resin can improve the bonding strength. Compared with other waterproof coatings, the waterproof coating of the present invention has significantly improved film-forming effect, waterproof performance and bonding strength. Attached Figure Description

[0028] Figure 1 This is a fluorescence microscope image of the waterproof adhesive coating for cement concrete bridge deck obtained in Example 1 of this invention.

[0029] Figure 2 This is a photograph of the cement concrete bridge deck waterproof adhesive coating obtained in Example 1 applied to a cement concrete block.

[0030] Figure 3 This is a photograph of an existing coating A applied to a cement concrete block to test its wheel adhesion effect.

[0031] Figure 4 This is a photograph of an existing B coating applied to a cement concrete block to test its wheel adhesion effect.

[0032] Figure 5 This is a photograph of an existing C coating applied to a cement concrete block to test its adhesion to wheels. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0034] Example 1

[0035] A waterproof adhesive coating for cement concrete bridge decks, the preparation method of which includes the following steps:

[0036] S1. Preparation of emulsified asphalt:

[0037] S101. By heating, 91% of 70# heavy-duty asphalt and 9% of 10# hard asphalt are brought into a fluid state, and the two are mixed in the fluid state to obtain blended asphalt.

[0038] S102. Add 3% low-density polyethylene to the blended asphalt at 180℃, shear at 5000r / min for 1 hour, and let stand for 24 hours after shearing.

[0039] S103. Heat the modified asphalt to 175℃, then dissolve 1.5% cationic emulsifier (hexadecyltrimethylammonium bromide C2 and hydroxyamide 760-1 mixed in a mass ratio of 2:1) in water, adjust the pH to 1.8~2.2, and control the temperature to 60℃ to obtain a cationic emulsifier solution. Add the cationic emulsifier solution to the emulsifying asphalt machine, then add the modified asphalt to emulsify the asphalt. Then cool it through a heat exchanger to form emulsified asphalt. Let the emulsified asphalt stand at room temperature.

[0040] S2. The emulsified asphalt, chloroprene latex, and water-based tackifying resin were mixed at a ratio of 55:40:5 (by mass) for 20 minutes at a stirring speed of 800 r / min to form a waterproof adhesive coating for cement concrete bridge decks. The fluorescence micrograph of the waterproof adhesive coating for cement concrete bridge decks obtained in this embodiment is shown below. Figure 1 As shown, from Figure 1 It can be seen that the waterproof adhesive coating for cement concrete bridge decks obtained in this embodiment has a dense cross-linked structure.

[0041] Example 2

[0042] A waterproof adhesive coating for cement concrete bridge decks, the preparation method of which includes the following steps:

[0043] S1. Preparation of emulsified asphalt:

[0044] S101. By heating, 91% of 70# heavy-duty asphalt and 9% of 10# hard asphalt are brought into a fluid state, and the two are mixed in the fluid state to obtain blended asphalt.

[0045] S102. Add 3% low-density polyethylene to the blended asphalt at 180℃, shear at 5000r / min for 1 hour, and let stand for 24 hours after shearing.

[0046] S103. The modified asphalt is heated to 175℃, and then 1.5% cationic emulsifier (dodecyl ammonium chloride AS-3 and hydroxyamide 760-1 mixed in a mass ratio of 2:1) is dissolved in water. The pH is adjusted to 1.8~2.2, and the temperature is controlled to 60℃ to obtain a cationic emulsifier solution. The cationic emulsifier solution is added to the emulsifying asphalt machine, followed by the modified asphalt, to emulsify the asphalt. Then, the asphalt is cooled through a heat exchanger to form emulsified asphalt. The emulsified asphalt is then placed at room temperature.

[0047] S2. Mix emulsified asphalt, chloroprene latex, and water-based tackifying resin in a ratio of 55:40:5 at a stirring speed of 800 r / min for 20 min to form a waterproof adhesive coating for cement concrete bridge deck.

[0048] Example 3

[0049] A waterproof adhesive coating for cement concrete bridge decks, the preparation method of which includes the following steps:

[0050] S1. Preparation of emulsified asphalt:

[0051] S101. By heating, 91% of 70# heavy-duty asphalt and 9% of 10# hard asphalt are brought into a fluid state, and the two are mixed in the fluid state to obtain blended asphalt.

[0052] S102. Add 3% low-density polyethylene to the blended asphalt at 180℃, shear at 5000r / min for 1 hour, and let stand for 24 hours after shearing.

[0053] S103. Heat the modified asphalt to 175℃, then dissolve 1.5% cationic emulsifier (hexadecyltrimethylammonium bromide C2) in water, adjust the pH to 1.8~2.2, and control the temperature to 60℃ to obtain a cationic emulsifier solution. Add the cationic emulsifier solution to the emulsifying asphalt machine, then add the modified asphalt to emulsify the asphalt. Then cool it through a heat exchanger to form emulsified asphalt. Let the emulsified asphalt stand at room temperature.

[0054] S2. Mix emulsified asphalt, chloroprene latex, and water-based tackifying resin in a ratio of 55:40:5 at a stirring speed of 800 r / min for 20 min to form a waterproof adhesive coating for cement concrete bridge deck.

[0055] Example 4

[0056] A waterproof adhesive coating for cement concrete bridge decks, the preparation method of which includes the following steps:

[0057] S1. Preparation of emulsified asphalt:

[0058] S101. By heating, 91% of 70# heavy-duty asphalt and 9% of 10# hard asphalt are brought into a fluid state, and the two are mixed in the fluid state to obtain blended asphalt.

[0059] S102. Add 3% low-density polyethylene to the blended asphalt at 180℃, shear at 5000r / min for 1 hour, and let stand for 24 hours after shearing.

[0060] S103. Heat the modified asphalt to 175℃, then dissolve 1.5% cationic emulsifier (dodecyl ammonium chloride AS-3) in water, adjust the pH to 1.8~2.2, and control the temperature to 60℃ to obtain a cationic emulsifier solution. Add the cationic emulsifier solution to the emulsifying asphalt machine, then add the modified asphalt to emulsify the asphalt. Then cool it down through a heat exchanger to form emulsified asphalt. Let the emulsified asphalt stand at room temperature.

[0061] S2. Mix emulsified asphalt, chloroprene latex, and water-based tackifying resin in a ratio of 55:40:5 at a stirring speed of 800 r / min for 20 min to form a waterproof adhesive coating for cement concrete bridge deck.

[0062] Example 5

[0063] A waterproof adhesive coating for cement concrete bridge decks, the preparation method of which includes the following steps:

[0064] S1. Preparation of emulsified asphalt:

[0065] S101. By heating, 91% of 70# heavy-duty asphalt and 9% of 10# hard asphalt are brought into a fluid state, and the two are mixed in the fluid state to obtain blended asphalt.

[0066] S102. Add 3% low-density polyethylene to the blended asphalt at 180℃, shear at 5000r / min for 1 hour, and let stand for 24 hours after shearing.

[0067] S103. Heat the modified asphalt to 175℃, then dissolve 1.5% cationic emulsifier (a mixture of hexadecyltrimethylammonium bromide C2 and hydroxyamide 760-1 by mass ratio) in water, adjust the pH to 1.8~2.2, and control the temperature to 60℃ to obtain a cationic emulsifier solution. Add the cationic emulsifier solution to the emulsifying asphalt machine, then add the modified asphalt to emulsify the asphalt. Then cool it through a heat exchanger to form emulsified asphalt. Let the emulsified asphalt stand at room temperature.

[0068] S2. Mix emulsified asphalt, chloroprene latex, and water-based tackifying resin in a ratio of 45:45:10 at a stirring speed of 800 r / min for 20 min to form a waterproof adhesive coating for cement concrete bridge deck.

[0069] Example 6

[0070] A waterproof adhesive coating for cement concrete bridge decks, the preparation method of which includes the following steps:

[0071] S1. Preparation of emulsified asphalt:

[0072] S101. By heating, 91% of 70# heavy-duty asphalt and 9% of 10# hard asphalt are brought into a fluid state, and the two are mixed in the fluid state to obtain blended asphalt.

[0073] S102. Add 3% low-density polyethylene to the blended asphalt at 180℃, shear at 5000r / min for 1 hour, and let stand for 24 hours after shearing.

[0074] S103. Heat the modified asphalt to 175℃, then dissolve 3% cationic emulsifier (hexadecyltrimethylammonium bromide C2 and hydroxyamide 760-1 mixed in a mass ratio of 2:1) in water, adjust the pH to 1.8~2.2, and control the temperature to 60℃ to obtain a cationic emulsifier solution. Add the cationic emulsifier solution to the emulsifying asphalt machine, then add the modified asphalt to emulsify the asphalt. Then cool it through a heat exchanger to form emulsified asphalt. Let the emulsified asphalt stand at room temperature.

[0075] S2. Mix emulsified asphalt, chloroprene latex, and water-based tackifying resin in a ratio of 55:40:5 at a stirring speed of 800 r / min for 20 min to form a waterproof adhesive coating for cement concrete bridge deck.

[0076] Comparative Example 1

[0077] A waterproof adhesive coating for cement concrete bridge decks, the preparation method of which includes the following steps:

[0078] S1. Preparation of emulsified asphalt:

[0079] S101. By heating, 91% of 70# heavy-duty asphalt and 9% of 10# hard asphalt are brought into a fluid state, and the two are mixed in the fluid state to obtain blended asphalt.

[0080] S102. Add 3% low-density polyethylene to the blended asphalt at 180℃, shear at 5000r / min for 1 hour, and let stand for 24 hours after shearing.

[0081] S103. Heat the modified asphalt to 175℃, then dissolve 3% of ordinary cationic emulsifier (slow-cracking and fast-setting quaternary ammonium salt emulsifier produced by Jinan Xiangfeng Weiye) in water, adjust the pH to 1.8~2.2, and control the temperature to 60℃ to obtain a cationic emulsifier solution. Add the solution to the emulsifying asphalt machine, then add the modified asphalt to emulsify the asphalt. Then cool it through a heat exchanger to form emulsified asphalt. Let the emulsified asphalt stand at room temperature.

[0082] S2. Mix emulsified asphalt, chloroprene latex, and water-based tackifying resin in a ratio of 55:40:5 at a stirring speed of 800 r / min for 20 min to form a waterproof adhesive coating for cement concrete bridge deck.

[0083] Comparative Example 2

[0084] A waterproof adhesive coating for cement concrete bridge decks, the preparation method of which includes the following steps:

[0085] S1. Preparation of emulsified asphalt:

[0086] S101. By heating, 91% of 70# heavy-duty asphalt and 9% of 10# hard asphalt are brought into a fluid state, and the two are mixed in the fluid state to obtain blended asphalt.

[0087] S102. Add 3% of styrene-butadiene-styrene copolymer (SBS) to the blended asphalt at 180℃, shear at 5000r / min for 3h, and let stand for 24h after shearing.

[0088] S103. Heat the modified asphalt to 175℃, then dissolve 1.5% cationic emulsifier (hexadecyltrimethylammonium bromide C2 and hydroxyamide 760-1 mixed in a mass ratio of 2:1) in water, adjust the pH to 1.8~2.2, and control the temperature to 60℃ to obtain a cationic emulsifier solution. Add the solution to the emulsifying asphalt machine, then add the modified asphalt to emulsify the asphalt. Then cool it through a heat exchanger to form emulsified asphalt. Let the emulsified asphalt stand at room temperature.

[0089] S2. Mix emulsified asphalt, chloroprene latex, and water-based tackifying resin in a ratio of 55:40:5 at a stirring speed of 800 r / min for 20 min to form a waterproof adhesive coating for cement concrete bridge deck.

[0090] Comparative Example 3

[0091] A waterproof adhesive coating for cement concrete bridge decks, the preparation method of which includes the following steps:

[0092] S1. Preparation of emulsified asphalt:

[0093] S101. By heating, 91% of 70# heavy-duty asphalt and 9% of 10# hard asphalt are brought into a fluid state, and the two are mixed in the fluid state to obtain blended asphalt.

[0094] S102. Add 3% high-density polyethylene to the blended asphalt at 180℃, shear at 5000r / min for 3h, and let stand for 24h after shearing.

[0095] S103. Heat the modified asphalt to 175℃, then dissolve 1.5% cationic emulsifier (hexadecyltrimethylammonium bromide C2 and hydroxyamide 760-1 mixed in a mass ratio of 2:1) in water, adjust the pH to 1.8~2.2, and control the temperature to 60℃ to obtain a cationic emulsifier solution. Add the solution to the emulsifying asphalt machine, then add the modified asphalt to emulsify the asphalt. Then cool it through a heat exchanger to form emulsified asphalt. Let the emulsified asphalt stand at room temperature.

[0096] S2. Mix emulsified asphalt, chloroprene latex, and water-based tackifying resin in a ratio of 55:40:5 at a stirring speed of 800 r / min for 20 min to form a waterproof adhesive coating for cement concrete bridge deck.

[0097] Comparative Example 4

[0098] A waterproof adhesive coating for cement concrete bridge decks, the preparation method of which includes the following steps:

[0099] S1. Preparation of emulsified asphalt:

[0100] S101. By heating, 91% of 70# heavy-duty asphalt and 9% of 10# hard asphalt are brought into a fluid state, and the two are mixed in the fluid state to obtain blended asphalt.

[0101] S102. Add 3% low-density polyethylene to the blended asphalt at 180℃, shear at 5000r / min for 3h, and let stand for 24h after shearing.

[0102] S103. Heat the modified asphalt to 175℃, then dissolve 1.5% cationic emulsifier (hexadecyltrimethylammonium bromide C2 and hydroxyamide 760-1 mixed in a mass ratio of 2:1) in water, adjust the pH to 1.8~2.2, and control the temperature to 60℃ to obtain a cationic emulsifier solution. Add the solution to the emulsifying asphalt machine, then add the modified asphalt to emulsify the asphalt. Then cool it through a heat exchanger to form emulsified asphalt. Let the emulsified asphalt stand at room temperature.

[0103] S2. Mix emulsified asphalt, chloroprene latex, and water-based tackifying resin in a ratio of 55:45:0 at a stirring speed of 800 r / min for 20 min to form a waterproof adhesive coating for cement concrete bridge deck.

[0104] Comparative Example 5

[0105] A waterproof adhesive coating for cement concrete bridge decks, the preparation method of which includes the following steps:

[0106] S1. Preparation of emulsified asphalt:

[0107] S101. By heating, 91% of 70# asphalt and 9% of 10# hard asphalt are brought into a fluid state, and the two are mixed in the fluid state to obtain blended asphalt.

[0108] S102. Add 3% low-density polyethylene to the blended asphalt at 180℃, shear at 5000r / min for 3h, and let stand for 24h after shearing.

[0109] S103. Heat the modified asphalt to 175℃, then dissolve 1.5% cationic emulsifier (hexadecyltrimethylammonium bromide C2 and hydroxyamide 760-1 mixed in a mass ratio of 2:1) in water, adjust the pH to 1.8~2.2, and control the temperature to 60℃ to obtain a cationic emulsifier solution. Add the solution to the emulsifying asphalt machine, then add the modified asphalt to emulsify the asphalt. Then cool it through a heat exchanger to form emulsified asphalt. Let the emulsified asphalt stand at room temperature.

[0110] S2. Mix emulsified asphalt, chloroprene latex, and water-based tackifying resin in a ratio of 55:0:5 at a stirring speed of 800 r / min for 20 min to form a waterproof adhesive coating for cement concrete bridge deck.

[0111] Comparative Example 6

[0112] A waterproof adhesive coating for cement concrete bridge decks, the preparation method of which includes the following steps:

[0113] S1. Preparation of emulsified asphalt:

[0114] S101. By heating, 91% of 70# asphalt and 9% of 10# hard asphalt are brought into a fluid state, and the two are mixed in the fluid state to obtain blended asphalt.

[0115] S102. Add 5% low-density polyethylene to the blended asphalt at 180℃, shear at 5000r / min for 3h, and let stand for 24h after shearing.

[0116] S103. Heat the modified asphalt to 175℃, then dissolve 1.5% cationic emulsifier (hexadecyltrimethylammonium bromide C2 and hydroxyamide 760-1 mixed in a mass ratio of 2:1) in water, adjust the pH to 1.8~2.2, and control the temperature to 60℃ to obtain a cationic emulsifier solution. Add the solution to the emulsifying asphalt machine, then add the modified asphalt to emulsify the asphalt. Then cool it through a heat exchanger to form emulsified asphalt. Let the emulsified asphalt stand at room temperature.

[0117] S2. Mix emulsified asphalt, chloroprene latex, and water-based tackifying resin in a ratio of 55:40:5 at a stirring speed of 800 r / min for 20 min to form a waterproof adhesive coating for cement concrete bridge deck.

[0118] Specifically, the parameter changes in Examples 1-6 and Comparative Examples 1-6 are shown in Table 1:

[0119] Table 1

[0120]

[0121] The waterproof adhesive coatings for cement concrete bridge decks prepared using Examples 1-6 and Comparative Examples 1-7 were compared with three commonly used waterproof adhesive coatings A, B, and C on the market. The film-forming performance results of the waterproof adhesive coatings are shown in Table 1, and the interlayer interaction performance results of the waterproof adhesive coatings are shown in Tables 2-4.

[0122] Table 2

[0123]

[0124] Table 3

[0125]

[0126] Table 4

[0127]

[0128] As can be seen from Tables 1-4, the waterproof bonding coating for cement concrete bridge decks provided by this invention has a shorter surface drying time compared to other waterproof coatings, enabling faster film formation in practical applications, which helps to accelerate construction speed and shorten the construction period. Its tear strength, tensile strength, elongation at break, and tensile properties after acid and alkali treatment are all outstanding, exceeding the performance indicators of commercially available waterproof coatings A, B, and C. In particular, its tensile shrinkage rate after acid and alkali treatment is far higher than other types of asphalt, indicating that the waterproof bonding coating prepared using this invention not only achieves high performance but also exhibits outstanding stability in both high-temperature and acid / alkali environments.

[0129] Experiments conducted on three types of waterproof adhesive coatings (A, B, and C) selected from the market have shown that the surface drying time of most waterproof adhesive coatings is between 120 and 360 minutes, while the body drying time is usually >180 minutes. The waterproof adhesive coating prepared in this invention surpasses most waterproof adhesive coatings on the market in terms of film-forming speed, which greatly improves the actual construction efficiency.

[0130] According to the test data, Example 3 forms a film faster in both surface drying time and volume drying time compared to the three coatings A, B, and C on the market. This is because the emulsifier used in Example 3, like the emulsifier used in Comparative Example 1, contains hexadecyltrimethylammonium bromide, thus greatly improving the film-forming speed of the waterproof adhesive coating. This also indicates that the fast-cracking and fast-setting emulsifier used in this patent can accelerate the film-forming speed of the emulsified asphalt. However, the permeability, heat resistance, acid and alkali resistance, tensile strength, and tear strength measured in Example 3 are significantly lower than those in Example 1. This result indicates that the waterproof adhesive coating modified with hydroxyamide and emulsified with hexadecyltrimethylammonium bromide has better performance in all aspects than the traditional SBS modified waterproof adhesive coating.

[0131] The high-performance waterproof adhesive coating prepared by this invention exhibits extremely strong ductility during tensile and tear tests on film-formed parts. Compared to commercially available waterproof adhesive coatings A, B, and C, the ductility of the waterproof adhesive coating prepared by this patent is significantly longer. After acid and alkali treatment, the strength of the waterproof adhesive coating prepared by this patent decreases, but its ductility increases. In the acid treatment test, three of the five type 1 dumbbell specimens treated with 2% sulfuric acid solution at 25°C for 7 days did not break when stretched to the top of the instrument during tensile testing. In the alkali treatment test, two of the five type 1 dumbbell specimens treated with saturated calcium hydroxide solution at 25°C for 7 days did not break when stretched during tensile testing. The top end was not broken. Compared with the type 1 dumbbell specimen prepared by the untreated high-performance waterproof adhesive coating in Example 1, its elongation after acid and alkali treatment was significantly improved. The waterproof adhesive coating in Example 1 met the specifications in terms of waterproof ability, whether under acid and alkali treatment or without treatment. Compared with the B coating on the market, the sample surface was damaged after acid treatment and could not withstand 0.3MPa water pressure, resulting in water leakage under water pressure. Although the surface of the A coating on the market was not damaged after acid and alkali treatment, it could not be stabilized under 0.3MPa water pressure for 120 minutes. Water leakage occurred in the water-resistant specimen after acid treatment at about 68 minutes. In contrast, the specimens of the C coating on the market did not show water leakage after acid and alkali treatment.

[0132] The coatings prepared in Examples 1-6 and Comparative Examples 1-6, as well as three commonly used waterproof adhesive coatings A, B, and C, were tested for non-stick properties and interlayer performance. The results are shown in Table 5.

[0133] Table 5

[0134]

[0135] like Figure 2-5 As shown in Table 5, the interlayer bond strength and interlayer shear strength of the waterproof adhesive coating prepared by this invention are higher than those of other waterproof adhesive coatings when applied between concrete and asphalt mixtures. In the non-stick wheel test, the waterproof adhesive coating prepared by this patent did not exhibit wheel sticking or paper sticking. This invention achieves high performance in waterproof adhesive coatings.

[0136] The embodiments described above merely illustrate specific implementation methods of this application, and while the descriptions are detailed and specific, they should not be construed as limiting the scope of protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the technical solution of this application, and these modifications and improvements all fall within the scope of protection of this application.

Claims

1. A waterproof adhesive coating for cement concrete bridge decks, characterized in that: The raw materials for preparation include: emulsified asphalt, chloroprene latex and water-based tackifying resin, and the ratio of emulsified asphalt: chloroprene latex: water-based tackifying resin by mass is 45~55: 40~50: 5~10. The emulsified asphalt is obtained by modifying the matrix with a mixture of heavy cross-linked petroleum asphalt and hard asphalt, and by using low-density polyethylene and cationic emulsifier.

2. The waterproof adhesive coating for cement concrete bridge decks according to claim 1, characterized in that: Based on the total mass of the matrix as 100%, heavy-grade petroleum asphalt accounts for 90-92% of the mass, while hard asphalt accounts for 8-10%.

3. The waterproof adhesive coating for cement concrete bridge decks according to claim 1, characterized in that: The mass of low-density polyethylene is 2-3% of the mass of the matrix.

4. The waterproof adhesive coating for cement concrete bridge decks according to claim 1, characterized in that: The cationic emulsifier accounts for 0.5% to 1.5% of the total mass of low-density polyethylene and matrix.

5. The waterproof adhesive coating for cement concrete bridge decks according to claim 1, characterized in that: The waterborne tackifying resin is one of waterborne rosin ester resin, waterborne epoxy resin, and waterborne acrylic copolymer.

6. The waterproof adhesive coating for cement concrete bridge decks according to claim 1, characterized in that: The cationic emulsifier is a fast-breaking and fast-setting cationic emulsifier, which is obtained by compounding one or two of hexadecyltrimethylammonium bromide, dodecylammonium chloride and hydroxyamide.

7. A method for preparing a waterproof adhesive coating for cement concrete bridge decks, characterized in that: Includes the following steps: S1. Preparation of emulsified asphalt: S101. By heating, heavy cross-linked petroleum asphalt and hard asphalt are brought into a fluid state, and the two are mixed in the fluid state to obtain blended asphalt; S102. Mix blended asphalt with low-density polyethylene, and then use high-temperature shearing to melt the low-density polyethylene into the blended asphalt to obtain modified asphalt. S103. The modified asphalt is heated and emulsified by adding a cationic emulsifier to obtain emulsified asphalt. S2. Mix emulsified asphalt, chloroprene latex, and water-based tackifying resin according to the specified ratio to obtain the waterproof adhesive coating for cement concrete bridge deck as described in any one of claims 1-6.

8. The method for preparing the waterproof adhesive coating for cement concrete bridge decks according to claim 7, characterized in that: In S102, the blended asphalt is heated to 175-180℃, and then low-density polyethylene is added to the blended asphalt. Then, it is sheared at a speed of 4900-5100 r / min to dissolve the low-density polyethylene into the blended asphalt.

9. The method for preparing the waterproof adhesive coating for cement concrete bridge decks according to claim 7, characterized in that: In S103, modified asphalt is heated to 170-180℃, then cationic emulsifier is dissolved in water, the pH is adjusted to 1.8-2.2, and the temperature is controlled to 60℃ to obtain cationic emulsifier solution. The cationic emulsifier solution is added to the emulsifying asphalt machine, and then modified asphalt is added to the emulsifying asphalt machine for emulsification to obtain emulsified asphalt.

10. The method for preparing the waterproof adhesive coating for cement concrete bridge decks according to claim 7, characterized in that: In S2, the materials are mixed and stirred at a stirring speed of 750-850 r / min for 15-25 minutes to form a waterproof adhesive coating for cement concrete bridge deck.

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