CN114225440B - Method for obtaining evaporation residue of waterborne epoxy modified emulsified asphalt by low-temperature evaporation - Google Patents
Method for obtaining evaporation residue of waterborne epoxy modified emulsified asphalt by low-temperature evaporation Download PDFInfo
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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Abstract
The invention provides a method for obtaining water-based epoxy modified emulsified asphalt evaporation residues by low-temperature evaporation, which comprises the following steps: step one, putting the waterborne epoxy modified emulsified asphalt as a sample into a clean silica gel tray; secondly, placing the sample in the first step into a blast oven to perform low-temperature evaporation at 80 ℃; and step three, cooling the water-based epoxy modified emulsified asphalt sample in the step two to room temperature to obtain the block-shaped residue of the water-based epoxy modified emulsified asphalt. The preparation process is simple, the operation is convenient, the prepared silica gel plate is safe and reliable, the cost is low, various performances of the evaporation residues after pouring and curing meet the standards, the performance test of the evaporation residues of the waterborne epoxy modified emulsified asphalt is facilitated, a proper and reasonable performance evaluation method is provided for evaluating the road performance of the waterborne epoxy modified emulsified asphalt, the waterborne epoxy modified emulsified asphalt meeting the use requirements of high-grade asphalt pavements is developed and popularized, and the social significance and the use value are high.
Description
Technical Field
The invention relates to the technical field of road and environmental engineering, in particular to a method for obtaining evaporation residues of waterborne epoxy modified emulsified asphalt by low-temperature evaporation.
Background
The cold mixing and cold paving technology generally utilizes materials such as modified emulsified asphalt and the like which can be constructed at normal temperature as cementing materials, is characterized in that production, transportation and paving are carried out at normal temperature, and has the advantages of low energy consumption, small pollution and the like compared with hot mixing and warm mixing technologies. Taking water-based epoxy as an example, a cross-linking structure is mainly formed through the curing reaction between the water-based epoxy and a curing agent, and the water-based epoxy has the advantages of no pollution, capability of being cured at normal temperature, excellent mechanical property after molding, good high-temperature property, good durability and the like. After the waterborne epoxy is added into the emulsified asphalt as a modifier, when the emulsified asphalt is demulsified and water is evaporated, asphalt molecules are wrapped by a three-dimensional network structure formed by the curing reaction of the epoxy resin and the curing agent to form an integral structure, so that the strength and the adhesiveness of the emulsified asphalt are enhanced, and a plurality of performance defects of the traditional modified emulsified asphalt are overcome. Meanwhile, due to the characteristic that the paving agent can be operated at normal temperature, the influence of construction seasons is small, and the paving time is flexible. In addition, the cold-mixed cold-paved asphalt mixture as a cold-patch material can also be applied to daily maintenance and curing of roads, and has very wide prospect.
The high and low temperature performance and rheological property of the asphalt have obvious influence on the application effect of the asphalt in engineering. Therefore, the asphalt material must have good high-temperature deformation resistance and low-temperature cracking resistance. However, there are still many problems in the performance research of the waterborne epoxy modified emulsified asphalt. Firstly, the types of the waterborne epoxy and the emulsified asphalt which can be applied to road engineering are various, and the different waterborne epoxy modified emulsified asphalt have larger performance difference. Secondly, water-borne epoxies are thermosetting materials and their curing process is not reversible. The conventional direct heating evaporation method for obtaining the evaporation residue of the waterborne epoxy modified emulsified asphalt can damage a cross-linked structure formed by curing the waterborne epoxy, the requirement of a sample in a forming performance evaluation test of a standard requirement is difficult to meet, even if the sample can be formed and tested, the tested sample is the performance after the structure is damaged, and the variability of a test result is very large. Meanwhile, in the process of direct heating evaporation, because the waterborne epoxy modified emulsified asphalt cannot be uniformly heated, the asphalt can be seriously aged due to local high temperature, and the performance evaluation of the asphalt is influenced, so that a standardized evaluation system cannot be formed, and the large-scale popularization and application of the waterborne epoxy modified emulsified asphalt is seriously hindered.
Therefore, developing the waterborne epoxy modified emulsified asphalt meeting the use requirement of high-grade asphalt pavement, providing a proper and reasonable performance evaluation method to evaluate the pavement performance, determining the performance difference among different waterborne epoxy modified emulsified asphalt, providing theoretical support for the application of the waterborne epoxy modified emulsified asphalt in entity engineering, developing a method for obtaining the evaporated residue of the waterborne epoxy modified emulsified asphalt by low-temperature evaporation to ensure the stable performance of the residue has very important practical significance.
Disclosure of Invention
The invention overcomes the defects in the prior art and provides a method for obtaining the evaporated residue of the waterborne epoxy modified emulsified asphalt by low-temperature evaporation.
The purpose of the invention is realized by the following technical scheme.
A method for obtaining evaporation residues of waterborne epoxy modified emulsified asphalt by low-temperature evaporation comprises the following steps:
step one, putting aqueous epoxy modified emulsified asphalt serving as a sample into a clean silica gel tray;
secondly, placing the sample in the first step into a blast oven to perform low-temperature evaporation at 80 ℃;
and step three, cooling the sample of the waterborne epoxy modified emulsified asphalt obtained in the step two to room temperature to obtain the blocky residue of the waterborne epoxy modified emulsified asphalt.
Preferably, the specification of the rigid waterborne epoxy modified emulsified asphalt/flexible waterborne epoxy modified emulsified asphalt as a test sample in the step one is 8.65 +/-0.5 kg/m 2 。
In any of the above embodiments, preferably, in the first step, the aqueous epoxy modified emulsified asphalt is rigid aqueous epoxy modified emulsified asphalt.
In any of the above embodiments, preferably, the low-temperature evaporation stability time of the rigid aqueous epoxy modified emulsified asphalt is 48 hours.
Preferably, in any of the above embodiments, the preparation method of the rigid waterborne epoxy modified emulsified asphalt in the first step comprises the following steps:
firstly, fully mixing an emulsifier with water to obtain a soap solution;
secondly, adjusting the pH of the soap solution, and preparing emulsified asphalt by a colloid mill;
and thirdly, adding rigid waterborne epoxy resin EP-51 into the emulsified asphalt obtained in the second step, and then adding curing agent HGC to obtain rigid waterborne epoxy modified emulsified asphalt.
In any of the above embodiments, the emulsifier in the first step is preferably any one of a 590 type anionic emulsifier, an A3T1 type anionic emulsifier and an LBP1 type cationic emulsifier for cold mixing and cold spreading.
Preferably according to any of the above embodiments, the pH of the soap solution A3T1 soap solution in the second step is 11.0 to 12.0.
Preferably according to any of the above embodiments, the pH of the soap solution of type LBP1 in the second step is 2.0-3.0.
Preferably, in any of the above schemes, the blast oven in the second step is heated to 80 ℃ in advance and kept for 1h before the sample in the first step is placed.
A method for obtaining evaporation residues of waterborne epoxy modified emulsified asphalt by low-temperature evaporation comprises the following steps:
step one, putting the waterborne epoxy modified emulsified asphalt as a sample into a clean silica gel tray;
secondly, placing the sample in the first step into a blast oven to perform low-temperature evaporation at 80 ℃;
and step three, cooling the sample of the waterborne epoxy modified emulsified asphalt in the step two to room temperature to obtain the block-shaped residue of the waterborne epoxy modified emulsified asphalt.
Preferably, the specification of the rigid waterborne epoxy modified emulsified asphalt/flexible waterborne epoxy modified emulsified asphalt as the sample in the step one is 8.65 +/-0.5 kg/m 2 。
Preferably, in any one of the above embodiments, the aqueous epoxy modified emulsified asphalt in the step one is flexible aqueous epoxy modified emulsified asphalt.
In any of the above embodiments, preferably, the low-temperature evaporation stability time of the flexible aqueous epoxy modified emulsified asphalt is 84h.
Preferably, in any of the above schemes, the preparation method of the flexible aqueous epoxy modified emulsified asphalt in the step one comprises the following steps:
firstly, fully mixing an emulsifier with water to obtain a soap solution;
secondly, adjusting the pH value of the soap solution, and preparing emulsified asphalt by a colloid mill;
and thirdly, adding flexible waterborne epoxy resin HY-A into the emulsified asphalt obtained in the second step, and then adding a curing agent HY-B to obtain the flexible waterborne epoxy modified emulsified asphalt.
In any of the above embodiments, the emulsifier in the first step is preferably any one of a 590 type anionic emulsifier, an A3T1 type anionic emulsifier, and an LBP1 type cationic emulsifier for cold mixing and cold spreading.
Preferably, the pH of the A3T1 soap solution in the second step is 11.0 to 12.0.
Preferably according to any of the above embodiments, the pH of the soap solution of LBP1 type in the second step is 2.0-3.0.
Preferably, in any of the above schemes, the forced air oven in the second step is heated to 80 ℃ in advance and kept for 1h before the sample in the first step is not put in.
The beneficial effects of the invention are as follows:
the method for obtaining the evaporation residues of the waterborne epoxy modified emulsified asphalt by low-temperature evaporation has the advantages of simple manufacturing process and convenient and fast operation method; the prepared silica gel plate is safe and reliable, has low cost, ensures that various performances of the evaporation residues after pouring and curing meet the standard, is favorable for performing performance test on the evaporation residues of the waterborne epoxy modified emulsified asphalt, provides a proper and reasonable performance evaluation method for evaluating the road performance of the waterborne epoxy modified emulsified asphalt, develops and popularizes the waterborne epoxy modified emulsified asphalt meeting the use requirement of high-grade asphalt pavements, and has high social significance and use value.
Drawings
FIG. 1a is a schematic representation of the evaporation residue from a direct heating evaporation process of 590 rigid 20% aqueous epoxy modified emulsified asphalt;
FIG. 1b is a schematic representation of the evaporation residue from a direct heating evaporation process of A3T1 rigid 20% aqueous epoxy modified emulsified asphalt;
FIG. 1c is a schematic representation of the evaporative residue of LBP1 rigid 20% aqueous epoxy modified emulsified asphalt obtained by direct heating evaporation;
FIG. 1d is a schematic representation of the evaporation residue of 590 flexible 20% aqueous epoxy modified emulsified asphalt obtained by direct heating evaporation;
FIG. 1e is a schematic representation of the evaporation residue of A3T1 flexible 20% aqueous epoxy modified emulsified asphalt obtained by direct heating evaporation;
FIG. 1f is a schematic representation of the evaporation residue of LBP1 rigid 20% aqueous epoxy modified emulsified asphalt obtained by direct heating evaporation;
FIG. 2a is a schematic representation of the low temperature evaporation mass loss of a rigid 10% aqueous epoxy modified emulsified asphalt;
FIG. 2b is a schematic representation of the low temperature evaporation mass loss of a flexible 10% aqueous epoxy modified emulsified asphalt;
FIG. 2c is a schematic representation of the low temperature evaporation mass loss of a rigid 20% aqueous epoxy modified emulsified asphalt;
FIG. 2d is a schematic representation of the low temperature evaporation mass loss of a flexible 20% aqueous epoxy modified emulsified asphalt;
FIG. 2e is a schematic representation of the low temperature evaporation mass loss of a rigid 30% aqueous epoxy modified emulsified asphalt;
FIG. 2f is a schematic representation of the low temperature evaporation mass loss of a flexible 30% aqueous epoxy modified emulsified asphalt;
FIG. 3a is a schematic representation of the evaporation residue of a rigid 20% aqueous epoxy modified emulsified asphalt at 100 ℃;
FIG. 3b is a schematic representation of the evaporation residue of a flexible 20% aqueous epoxy modified emulsified asphalt at 100 ℃.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
In order to further understand the technical features of the present invention, the present invention is described in detail with reference to the specific embodiments below. The embodiments are given by way of illustration only and not by way of limitation, and any insubstantial modifications, based on the present disclosure, may be made by those skilled in the art without departing from the scope of the present disclosure.
1. Preparation of aqueous epoxy emulsified asphalt
The waterborne epoxy system consists of two components, namely waterborne epoxy resin and a curing agent, and in order to explore the modification effect of different waterborne epoxy emulsions and curing agents on emulsified asphalt, two rigid and flexible waterborne epoxy emulsion systems which are stable in emulsion storage, uniform in film formation, free of particles and bubbles and good in compatibility with the emulsified asphalt are selected for testing.
1. Preparation of rigid waterborne epoxy modified emulsified asphalt
The preparation method of the rigid waterborne epoxy modified emulsified asphalt comprises the following steps:
firstly, fully mixing an emulsifier with water to obtain a soap solution; the emulsifier is any one of 590 type anionic emulsifier, A3T1 type anionic emulsifier and LBP1 type cationic emulsifier for cold mixing and cold spreading; the adding amount of the 590 type anionic emulsifier is 2.5 percent of the mass of the emulsified asphalt, the adding amount of the A3T1 type anionic emulsifier is 3.5 percent of the mass of the emulsified asphalt, and the adding amount of the LBP1 type cationic emulsifier is 3.0 percent of the mass of the emulsified asphalt; the oil-water ratio of the three emulsified asphalts is 60:40;
secondly, adjusting the pH of the soap solution, and preparing emulsified asphalt by a colloid mill; wherein, the pH value of the A3T1 type soap solution is 11.0-12.0; the pH of LBP1 type soap solution is 2.0-3.0.
Thirdly, adding rigid waterborne epoxy resin EP-51 into the emulsified asphalt obtained in the second step, and then adding curing agent HGC to obtain rigid waterborne epoxy modified emulsified asphalt, wherein the mixing ratio of the rigid waterborne epoxy resin EP-51 to the curing agent HGC is 1:1.
2. preparation of flexible aqueous epoxy emulsified asphalt
The preparation method of the flexible waterborne epoxy modified emulsified asphalt comprises the following steps:
step one, fully mixing an emulsifier with water to obtain a soap solution, wherein the emulsifier is any one of a 590 type anionic emulsifier, an A3T1 type anionic emulsifier and an LBP1 type cationic emulsifier which are used for cold mixing and cold spreading; wherein the addition amount of the 590 type anionic emulsifier is 2.5 percent of the mass of the emulsified asphalt, the addition amount of the A3T1 type anionic emulsifier is 3.5 percent of the mass of the emulsified asphalt, and the addition amount of the LBP1 type cationic emulsifier is 3.0 percent of the mass of the emulsified asphalt; the oil-water ratio of the three emulsified asphalts is 60:40.
secondly, adjusting the pH of the soap solution, and preparing emulsified asphalt by a colloid mill; adjusting pH of A3T1 type soap solution to 11.0-12.0; the pH of LBP1 type soap solution is 2.0-3.0.
And step three, adding flexible waterborne epoxy resin HY-A into the emulsified asphalt obtained in the step two, and then adding a curing agent HY-B to obtain flexible waterborne epoxy modified emulsified asphalt, wherein the ratio of waterborne epoxy resin HY-A to the curing agent HY-B in the flexible waterborne epoxy resin is 10:1.
2. the existing method for obtaining the evaporation residue of the waterborne epoxy modified emulsified asphalt and evaluating and exploring the performance of the evaporation residue
1. Obtaining water-based epoxy emulsified asphalt evaporation residue by adopting direct heating method
As shown in FIGS. 1a, 1b, 1c, 1d, 1E and 1f, a rigid aqueous epoxy modified emulsified asphalt with a mixing amount of 20% and a flexible aqueous epoxy modified emulsified asphalt with a mixing amount of 20% prepared by a preparation method of 'I' and 'preparing aqueous epoxy modified emulsified asphalt' are selected, and a rigid aqueous epoxy modified emulsified asphalt evaporation residue and a flexible aqueous epoxy modified emulsified asphalt evaporation residue are obtained according to a method of 'T0651-1993 emulsified asphalt evaporation residue content test' in JTG E20-2011 test procedure for road engineering asphalt and asphalt mixture.
FIG. 1a, 1b, 1c, 1d, 1e, 1f show:
(1) The shape of evaporation residues obtained by directly heating and evaporating rigid and flexible water-based epoxy emulsified asphalt is obviously different after being cooled. The evaporation residues of the three rigid waterborne epoxy modified emulsified asphalt are all in a bulk shape and a block shape on the whole, the residues are mutually crosslinked to form a net-shaped structure with more pores in the inner part and the surface, because the curing reaction between the waterborne epoxy and the curing agent thereof can be accelerated by heating, the waterborne epoxy in a local heated area is rapidly cured to form a partial crosslinked structure, in the process of continuous heating, the partial crosslinked structure formed by the curing reaction is melted at an overhigh temperature, the pores are formed on the surface of the structure after the moisture originally filled in the net-shaped structure is completely evaporated, and the cooled evaporation residues of the rigid waterborne epoxy modified emulsified asphalt present the appearance characteristics of being in a bulk shape and a porous net shape.
(2) The evaporation residues obtained by the direct heating evaporation method of the three types of flexible water-based epoxy modified emulsified asphalt are integrally in a paste state in appearance, and more lumps and floccules exist in the residues because the curing reaction between the flexible water-based epoxy and the curing agent thereof is slow, the curing forming speed is slower than that of rigid water-based epoxy, after the water in the water-based epoxy modified emulsified asphalt is completely evaporated, a cross-linked network structure of the water-based epoxy modified emulsified asphalt is not completely formed, and the asphalt is inserted into only part of the network structure to form the lumps and floccules-shaped residues.
According to the analysis, the shapes of the evaporation residues obtained by directly heating the rigid and flexible water-based epoxy emulsified asphalt after cooling are obviously different. Meanwhile, the evaporation residues of the rigid and flexible water-based epoxy modified emulsified asphalt obtained by the direct heating method cannot be subjected to subsequent performance evaluation, firstly, the evaporation residues obtained by the method cannot meet the requirements specified in a forming performance evaluation test of standard requirements easily, even if a sample can be formed and tested, the tested sample has the performance after the structure is damaged, and the test result has great variability; secondly, in the process of direct heating evaporation, because the waterborne epoxy modified emulsified asphalt can not be uniformly heated, the asphalt is seriously aged due to local high temperature, and the problem of inaccurate and unreasonable performance evaluation can be caused.
The method randomly selects the rigid water-based epoxy modified emulsified asphalt with the mixing amount of 20 percent and the flexible water-based epoxy modified emulsified asphalt with the mixing amount of 20 percent for direct heating evaporation, and evaporation residues of the rigid water-based epoxy modified emulsified asphalt and the flexible water-based epoxy modified emulsified asphalt with the mixing amount of 20 percent cannot be subjected to subsequent performance evaluation, not to mention the water-based epoxy modified emulsified asphalt with other mixing amounts, even if evaporation residues of the water-based epoxy modified emulsified asphalt with other mixing amounts are obtained by a direct evaporation method, the subsequent performance evaluation can be carried out, and the performance evaluation of the water-based epoxy modified emulsified asphalt with consistent mixing amount cannot be met, so that the defects still exist.
2. Obtaining water-based epoxy modified emulsified asphalt evaporation residue by adopting normal temperature evaporation method
According to the records of the literature ' study on high temperature performance of modified emulsified asphalt in Zhaowei, fuli, wuhan university of science and engineering (traffic science and engineering edition) ' 2021,45 (01): 191-194 ', the evaporated residue of the emulsified asphalt obtained by the normal-temperature evaporation method is the closest to the actual working state of the emulsified asphalt in engineering, and the evaporated residue of the emulsified asphalt obtained by the method can be effectively prevented from being damaged by the high temperature when the emulsified asphalt is applied to the waterborne epoxy modified emulsified asphalt, but the method has long acquisition time of the evaporated residue and low actual operability, and the evaporated residue in the obtained waterborne epoxy modified emulsified asphalt can still contain residual moisture.
Therefore, it is necessary to determine an appropriate evaporation temperature to ensure the timeliness of the acquisition of the evaporation residue without destroying the structure of the waterborne epoxy modified emulsified asphalt.
3. Low-temperature evaporation method for obtaining evaporation residue of waterborne epoxy modified emulsified asphalt and evaluating and exploring performance of evaporation residue
In the method, the rigid waterborne epoxy modified emulsified asphalt and the flexible waterborne epoxy modified emulsified asphalt are prepared by the preparation method described under 'I' and 'preparing waterborne epoxy modified emulsified asphalt' in the specification, and in the method, a 590 type anionic emulsifier is taken as an example, because the 590 type anionic emulsifier has low solid content and high water content, namely the water can be evaporated under the most unfavorable condition, and the water of other types of 'A3T 1 type anionic emulsifier' and 'LBP 1 type cationic emulsifier' can be evaporated, namely the rigid waterborne epoxy modified emulsified asphalt and the flexible waterborne epoxy modified emulsified asphalt are prepared by the preparation method of 'I' and 'preparing waterborne epoxy modified emulsified asphalt': 590 rigidity 10% water-based epoxy modified emulsified asphalt, 590 flexibility 10% water-based epoxy modified emulsified asphalt, 590 rigidity 20% water-based epoxy modified emulsified asphalt, 590 flexibility 20% water-based epoxy modified emulsified asphalt, 590 rigidity 30% water-based epoxy modified emulsified asphalt, and 590 flexibility 30% water-based epoxy modified emulsified asphalt.
And judging the evaporation process of the residual water content of the waterborne epoxy modified emulsified asphalt according to the mass loss conditions of different waterborne epoxy modified emulsified asphalt, and finally determining the most suitable evaporation temperature and evaporation time for obtaining the low-temperature evaporation residue of the waterborne epoxy modified emulsified asphalt. The specific test flow and method are as follows:
1. test temperature
Setting 40 ℃ as initial temperature, and gradually increasing to 100 ℃ by taking 20 ℃ as gradient, and determining four temperatures of 40 ℃,60 ℃, 80 ℃ and 100 ℃.
2. Test device
A blast oven (temperature: 20 ℃ plus or minus 0.1-400 ℃ plus or minus 0.1 ℃), a balance (0 g plus or minus 0.1-10 kg plus or minus 0.1 g), a self-made silica gel tray (170 mm multiplied by 10 mm), and the like.
3. Test procedure
The method comprises the following steps: preparing a blast oven, a balance, a self-made silica gel tray and the like for standby, setting the preset temperature of the blast oven to be 80 ℃ in advance, keeping the preset temperature for 1h, weighing and recording the weight of the silica gel tray, and respectively weighing and recording the water-based epoxy modified emulsified asphalt according to the weight of 8.65 +/-0.5 kg/m 2 Placing the specification as a sample in a clean silica gel tray, and placing the sample at room temperature for 1h for later use;
step two: placing the sample in the first step into a blast oven for low-temperature evaporation, weighing once at the same time interval and recording the weighing mass, wherein the mass change is large in the first 24 hours generally, and after weighing for multiple times, stopping the test when the weighing mass is less than 0.5g for two times continuously until the mass loss of the waterborne epoxy modified emulsified asphalt tends to be flat and slow; the interval time can be preferably selected to be 11.5 or 12.5h, and the asphalt is aged for too long evaporation time, so that the quality is constant for two or three times;
step three: and finally, after the sample is cooled to room temperature, obtaining the residue of the waterborne epoxy modified emulsified asphalt.
The aqueous epoxy modified emulsified asphalt in the first step is 590 rigidity 10% aqueous epoxy modified emulsified asphalt, 590 flexibility 10% aqueous epoxy modified emulsified asphalt, 590 rigidity 20% aqueous epoxy modified emulsified asphalt, 590 flexibility 20% aqueous epoxy modified emulsified asphalt, 590 rigidity 30% aqueous epoxy modified emulsified asphalt and 590 flexibility 30% aqueous epoxy modified emulsified asphalt.
4. Test results
The test results are shown in fig. 2a, 2b, 2c, 2d, 2e, 2f and fig. 3a and 3b, on the premise that the performance of the waterborne epoxy modified emulsified asphalt is not affected, and the timeliness obtained by the evaporation residues is ensured.
From fig. 2a, 2b, 2c, 2d, 2e, 2 f:
(1) When 590 aqueous epoxy modified emulsified asphalt with different aqueous epoxy types and mixing amounts is evaporated at low temperature at different temperatures, the water evaporation rate, namely the mass change rate of evaporation residues, is remarkably different. The temperature is increased, the evaporation rate of water in the water-based epoxy modified emulsified asphalt is accelerated, when the evaporation temperature is 40 ℃, the mass of evaporation residues of the rigid water-based epoxy modified emulsified asphalt under three mixing amounts still does not reach a stable state (the mass difference is less than 0.5g after two continuous weighing processes), the mass of the evaporation residues can reach a basically stable state at 60 ℃ for 96 hours, and the corresponding mass of the evaporation residues can reach a basically stable state at 80 ℃ and 100 ℃ for 48 hours and 36 hours; the water evaporation speed of the flexible waterborne epoxy modified emulsified asphalt is relatively slow at the same temperature, the evaporation residue quality can be basically stable within 84h and 60h at the low-temperature evaporation temperature of 80 ℃ and 100 ℃, but the evaporation residue quality of the flexible waterborne epoxy modified emulsified asphalt can not be stable within 96h at the temperature lower than 80 ℃, and a certain amount of water still contained in the residue is not evaporated yet.
(2) The quality change of the evaporation residue 24h and 48h before the low-temperature evaporation test of the rigid and flexible water-based epoxy modified emulsified asphalt is analyzed, so that the water evaporation amount of the residue is continuously reduced along with the increase of the mixing amount under the same water-based epoxy type. The continuous increase of the waterborne epoxy enhances the modification effect of the waterborne epoxy modified emulsified asphalt, the curing time of the waterborne epoxy modified emulsified asphalt is correspondingly shortened, and the cured waterborne epoxy modified emulsified asphalt forms a surface seal layer to hinder the evaporation of water to a certain extent.
(3) When the quality of the rigid and flexible water-based epoxy modified emulsified asphalt residue is basically stable at 80 ℃ and 100 ℃, due to the high temperature, trace moisture remained in the emulsified asphalt and a small amount of light components in the asphalt are continuously volatilized, so that the quality of the evaporated residue is still slightly reduced. In addition, the excessively high evaporation temperature not only easily causes the asphalt to age, but also can find that when the evaporation temperature is 100 ℃, the obtained evaporation residue of the rigid waterborne epoxy modified emulsified asphalt has serious shrinkage cracking due to the rapid solidification speed and water evaporation, and the evaporation residue of the flexible waterborne epoxy modified emulsified asphalt has severe water evaporation due to the excessively high temperature, so that pits are left after excessive bubbles are broken, so that the residue cannot obtain a flat surface.
When the evaporation temperature is 40 ℃ and 60 ℃, the time required for completely evaporating the water in the rigid and flexible waterborne epoxy modified emulsified asphalt is too long, and the test timeliness is poor.
Comprehensively considering the timeliness of low-temperature evaporation and the basic situation of the evaporation residue of the waterborne epoxy modified emulsified asphalt, ensuring that the evaporation residue of the waterborne epoxy modified emulsified asphalt can be obtained as soon as possible without influencing the performance of the waterborne epoxy modified emulsified asphalt, and finally determining that the low-temperature evaporation temperature of the rigid and flexible waterborne epoxy modified emulsified asphalt is 80 ℃ and the evaporation time is 48 hours and 84 hours respectively.
According to the T0651-1993 emulsified asphalt evaporation residue content test in JTG E20-2011 road engineering asphalt and asphalt mixture test specification, the adopted temperature is 163 +/-3 ℃, and the temperature is lower than 80 ℃ in the method.
4. And (4) conclusion:
for comparison of the appearance, the evaporation residue obtained by the three different evaluation methods has a significant difference in morphology after cooling:
the rigid waterborne epoxy modified emulsified asphalt evaporation residues obtained by the direct heating evaporation method are all in a lump shape and a block shape on the whole, the flexible waterborne epoxy modified emulsified asphalt evaporation residues are in a paste shape on the whole on the appearance, and the evaporation residue performance cannot be detected if more lumps and flocculation belts exist in the residues;
the normal temperature evaporation method requires too long time, and the evaporation residue still contains water;
the evaporation residue of the waterborne epoxy modified emulsified asphalt obtained by the low-temperature evaporation method shows stronger integrity, is blocky, has less change in performance compared with that before evaporation, and can be used for performance evaluation.
Specifically, the following steps are carried out: the technical scheme of the invention relates to a plurality of parameters, and the beneficial effects and the remarkable progress of the invention can be obtained only by comprehensively considering the synergistic effect among the parameters. In addition, the value ranges of the parameters in the technical scheme are obtained through a large number of tests, and for each parameter and the combination of the parameters, the inventor records a large number of test data, is limited by space, and does not disclose specific test data.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (1)
1. A method for obtaining evaporation residues of waterborne epoxy modified emulsified asphalt by low-temperature evaporation is characterized by comprising the following steps: the method comprises the following steps:
preparing a blast oven, a balance and a self-made silica gel tray for standby, setting the temperature of the blast oven to be preset at 80 ℃ in advance, keeping the temperature for 1h, weighing and recording the weight of the silica gel tray; the water-based epoxy modified emulsified asphalt is mixed according to the proportion of 8.65 plus or minus 0.5kg/m 2 Placing the specification as a sample in a clean silica gel tray, and placing the sample at room temperature for 1h for later use;
step two, placing the sample in the step one in a blast oven for low-temperature evaporation, weighing once every same time and recording the weighing mass, weighing for multiple times until the mass loss of the waterborne epoxy modified emulsified asphalt tends to be gentle, and stopping the test when the weighing mass is less than 0.5g for two times continuously; the interval time is 11.5h or 12.5h, and the mass is constant for 2-3 times continuously;
step three, cooling the sample of the waterborne epoxy modified emulsified asphalt in the step two to room temperature to obtain the block-shaped residue of the waterborne epoxy modified emulsified asphalt;
the aqueous epoxy modified emulsified asphalt in the first step is 590 rigidity 10% aqueous epoxy modified emulsified asphalt, 590 flexibility 10% aqueous epoxy modified emulsified asphalt, 590 rigidity 20% aqueous epoxy modified emulsified asphalt, 590 flexibility 20% aqueous epoxy modified emulsified asphalt, 590 rigidity 30% aqueous epoxy modified emulsified asphalt, 590 flexibility 30% aqueous epoxy modified emulsified asphalt;
the preparation method of the rigid waterborne epoxy modified emulsified asphalt comprises the following steps:
firstly, fully mixing an emulsifier with water to obtain a soap solution; the emulsifier is any one of 590 type anionic emulsifier, A3T1 type anionic emulsifier and LBP1 type cationic emulsifier for cold mixing and cold spreading; the addition amount of the 590 type anionic emulsifier is 2.5 percent of the mass of the emulsified asphalt, the addition amount of the A3T1 type anionic emulsifier is 3.5 percent of the mass of the emulsified asphalt, and the addition amount of the LBP1 type cationic emulsifier is 3.0 percent of the mass of the emulsified asphalt; the oil-water ratio of the three emulsified asphalts is 60:40;
secondly, adjusting the pH of the soap solution, and preparing emulsified asphalt by a colloid mill; wherein, the pH value of A3T1 type soap liquid is 11.0-12.0, and the pH value of LBP1 type soap liquid is 2.0-3.0;
thirdly, adding rigid waterborne epoxy resin EP-51 into the emulsified asphalt obtained in the second step, and then adding curing agent HGC to obtain rigid waterborne epoxy modified emulsified asphalt, wherein the mixing ratio of the rigid waterborne epoxy resin EP-51 to the curing agent HGC is 1:1;
the preparation method of the flexible waterborne epoxy modified emulsified asphalt comprises the following steps:
firstly, fully mixing an emulsifier with water to obtain a soap solution; the emulsifier is any one of 590 type anionic emulsifier, A3T1 type anionic emulsifier and LBP1 type cationic emulsifier for cold mixing and cold spreading; the addition amount of the 590 type anionic emulsifier is 2.5 percent of the mass of the emulsified asphalt, the addition amount of the A3T1 type anionic emulsifier is 3.5 percent of the mass of the emulsified asphalt, and the addition amount of the LBP1 type cationic emulsifier is 3.0 percent of the mass of the emulsified asphalt; the oil-water ratio of the three emulsified asphalts is 60:40;
secondly, adjusting the pH value of the soap solution, and preparing emulsified asphalt by a colloid mill; wherein, the pH value of A3T1 type soap liquid is 11.0-12.0, and the pH value of LBP1 type soap liquid is 2.0-3.0;
and step three, adding flexible waterborne epoxy resin HY-A into the emulsified asphalt obtained in the step two, and then adding a curing agent HY-B to obtain flexible waterborne epoxy modified emulsified asphalt, wherein the mixing ratio of the flexible waterborne epoxy resin HY-A to the curing agent HY-B is 10:1;
the low-temperature evaporation temperature of the rigid waterborne epoxy modified emulsified asphalt is 80 ℃, and the low-temperature evaporation stabilization time is 48 hours; the low-temperature evaporation temperature of the flexible waterborne epoxy modified emulsified asphalt is 80 ℃, and the low-temperature evaporation stabilization time is 84h.
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