CN115975390A - High-solid-content quick demulsification modified emulsified asphalt and preparation method thereof - Google Patents
High-solid-content quick demulsification modified emulsified asphalt and preparation method thereof Download PDFInfo
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Abstract
The invention discloses high-solid-content quick demulsification modified emulsified asphalt and a preparation method thereof, relates to the technical field of road engineering materials, and solves the problem that the existing modified emulsified asphalt is difficult to meet higher and higher technical requirements in terms of solid content, demulsification speed and storage stability. The invention comprises emulsified asphalt and SBS latex, the adding amount of SBS latex is 5-10% of the mass of emulsified asphalt, the emulsified asphalt comprises: 58-65% of matrix asphalt, 0.3-0.6% of cationic compound emulsifier, pH value regulator, 0.2-0.5% of stabilizer, defoaming agent, solubilizer accounting for 1.0-1.5% of the mass of the matrix asphalt and the balance of water, wherein the solubilizer is a mixture of sucrose fatty acid ester and Arabic gum, and the cationic compound emulsifier comprises a mid-crack emulsifier and at least one fast-crack emulsifier. The invention has the advantages of high solid content, high demulsification speed, good storage stability and the like.
Description
Technical Field
The invention relates to the technical field of road engineering materials, in particular to high-solid-content quick demulsification modified emulsified asphalt and a preparation method thereof.
Background
The emulsified asphalt has the advantages of simple construction, no need of heating on site, energy conservation, environmental protection and the like, and has unique superiority in the maintenance and the curing of asphalt pavements, so that a large amount of emulsified asphalt is widely applied to the paving and the curing of highway engineering in many countries in the world at present. The synchronous paving ultrathin wearing layer technology has wide application prospect when being used for maintenance of bridge deck pavement, can give consideration to driving comfort and safety, and has the advantages of quick and convenient construction, quick open traffic and remarkable economic and social benefits. However, the synchronous construction method provides higher requirements for interlayer bonding materials, and common emulsified asphalt or modified emulsified asphalt has the following defects, so that the requirement for synchronously paving an ultrathin wearing layer is difficult to meet.
(1) The traditional emulsified asphalt or modified emulsified asphalt for interlayer adhesion belongs to a spraying type, the solid content is low, generally about 50%, and the technical requirement of synchronously paving an ultrathin wearing layer is difficult to achieve due to the fact that the water content is high, the film forming thickness is small, and the adhesion force of an adhesion layer is weak.
(2) Due to the reasons of low solid content, improper matching of types of emulsifiers and the like, the demulsification speed of the common emulsified asphalt or the modified emulsified asphalt is low, and the technical requirement of synchronous paving and quick demulsification is difficult to meet.
(3) The higher the solid content is, the higher the emulsification difficulty is, and the storage stability is difficult to ensure.
Therefore, the modified emulsified asphalt which meets the requirements is developed continuously according to the technical requirements of synchronous paving construction of the ultrathin wearing layer of the bridge floor, and the method has important significance for improving the maintenance level of the pavement.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the existing modified emulsified asphalt is difficult to meet the increasingly demanding technical requirements of synchronously paving an ultrathin wearing layer on the aspects of solid content, demulsification speed and storage stability.
The invention is realized by the following technical scheme:
the high-solid-content quick demulsification modified emulsified asphalt comprises emulsified asphalt and SBS latex, wherein the addition amount of the SBS latex is 5-10% of the mass of the emulsified asphalt, and the emulsified asphalt comprises the following components in percentage by mass:
58-65% of matrix asphalt, 0.3-0.6% of cationic compound emulsifier, a pH value regulator, 0.2-0.5% of stabilizer, a defoaming agent, a solubilizer accounting for 1.0-1.5% of the mass of the matrix asphalt, and the balance of water, wherein the solubilizer is a mixture of sucrose fatty acid ester and gum arabic, and the cationic compound emulsifier comprises a mid-splitting emulsifier and at least one fast-splitting emulsifier.
Furthermore, the quick-cracking emulsifier is one or a mixture of an alkylamine quick-cracking emulsifier and an imidazoline quick-cracking emulsifier, and the medium-cracking emulsifier is a quaternary ammonium salt emulsifier.
The content of SBS in the SBS latex is 50-70%.
Further, the content of SBS in the SBS latex is 60%.
The invention considers that the solid content is improved and how to ensure the emulsifying property, and selects the SBS latex with higher SBS content in order to further improve the solid content while effectively solubilizing through the solubilizer; the fast-cracking emulsifier is beneficial to fast demulsification of emulsified asphalt, but has adverse effect on the stability of the emulsified asphalt, the action effect of the medium-cracking emulsifier is opposite to that of the medium-cracking emulsifier, and in order to give consideration to both demulsification speed and stability, the medium-cracking emulsifier and at least one fast-cracking emulsifier which are both cationic emulsifiers are compounded to synergistically improve the comprehensive properties such as solid content, emulsifying property and the like.
The invention preferably selects a high-solid content quick demulsification modified emulsified asphalt, and the alkylamine quick-cracking emulsifier is octadecylpropylene diamine; the imidazoline fast-cracking emulsifier is 1-aminoethyl-2-heptadecyl imidazoline; the quaternary ammonium salt emulsifier is N- (3-octadecylamino-2-hydroxy) -propyl-trimethyl ammonium chloride, and the mass ratio of the N- (3-octadecylamino-2-hydroxy) -propyl-trimethyl ammonium chloride to the N- (3-octadecylamino-2-hydroxy) -propyl-trimethyl ammonium chloride is 3.
The invention adopts three cationic emulsifiers for compounding, wherein, two of alkylamine fast-cracking emulsifiers and imidazoline fast-cracking emulsifiers are fast-cracking emulsifiers, quaternary ammonium salt emulsifiers are medium-cracking emulsifiers, the former two emulsifiers are beneficial to fast emulsion breaking, but the emulsion breaking is too fast and the storage is easy to be unstable, therefore, the quaternary ammonium salt emulsifiers are adopted to relieve the emulsion breaking, and the three emulsifiers are mutually matched; secondly, the present invention uses a mixture of sucrose fatty acid ester and gum arabic as a solubilizer, both of which have certain surface-active effects, which show certain similarities with emulsifiers. The former contains strongly hydrophilic sucrose hydroxyl groups and lipophilic fatty acid groups, and the latter contains water-compatible polysaccharide chains and oil-compatible polypeptide chains. Thus, when both are added to the emulsion, the rear hydrophilic end is able to enter the aqueous solution during emulsification and the oleophilic end has an affinity for the bitumen molecules, which will aid in the dispersion of the bitumen in the aqueous solution. Therefore, the sucrose fatty acid ester and the Arabic gum can play a synergistic effect with the emulsifier, and have positive effects on the emulsification, dispersion uniformity and the like of the asphalt, so that the demulsification can be carried out quickly, and the higher solid content can be kept.
The sucrose fatty acid ester and the Arabic gum can improve the viscosity of the water solution after being dissolved in water, so that the viscosity of an emulsified asphalt system is increased. The stabilizing agent has the similar effect as an organic stabilizing agent, and can prevent the movement of asphalt oil drops to a certain extent, so that the polymerization or agglomeration of micro asphalt oil drops is slowed down, the separation degree of water and asphalt is reduced, and the stabilizing effect is achieved.
According to the analysis, the oversize of the emulsified asphalt is slightly lower after the addition of the sucrose fatty acid ester and the gum arabic, which indicates that the agglomerated asphalt residue can be reduced; the content of the evaporation residue and the softening point are slightly increased, and the penetration degree is slightly reduced, which means that the two can improve the comprehensive performance of the emulsified asphalt to a certain extent.
Finally, the pH value regulator, the stabilizer and the emulsifier are adopted to ensure that the emulsified asphalt can be demulsified quickly and has good storage stability, the SBS latex with the solid content of more than 55 percent is added, and the solid content of the emulsified asphalt is greatly improved by reasonably selecting the formula materials on the premise of ensuring the emulsifying effect.
The invention preferably selects the high-solid-content quick demulsification modified emulsified asphalt, wherein the sucrose fatty acid ester and the Arabic gum are in powder form, and the mass ratio of the sucrose fatty acid ester to the Arabic gum is 1.
The invention preferably selects a high-solid-content quick demulsification modified emulsified asphalt, the stabilizer comprises an organic stabilizer, an inorganic stabilizer and gelatin, the organic stabilizer is polyvinyl alcohol, the inorganic stabilizer is ferric chloride, and the mass ratio of the polyvinyl alcohol to the ferric chloride to the gelatin is 1:1:1.
the invention preferably selects the high-solid-content quick demulsification modified emulsified asphalt, and the matrix asphalt is asphalt meeting the technical specification of highway asphalt pavement construction.
Furthermore, the defoaming agent is an organic silicon defoaming agent and a polyether defoaming agent, and the dosage of the defoaming agent is 0.1-0.2% of the mass of the emulsified asphalt.
The invention preferably selects the high-solid-content quick demulsification modified emulsified asphalt, the pH value regulator is concentrated hydrochloric acid, the substance concentration is 10-12mol/L, and the pH value of the mixed solution is regulated to 2-3.
The invention preferably selects a high-solid content quick demulsification modified emulsified asphalt, takes a mixture of sucrose fatty acid ester and Arabic gum as a solubilizer, wherein the Arabic gum is a natural industrial product and has considerable green, environmental protection and sustainability. On the one hand, the two have certain surface activity, can reduce the surface tension of liquid, increase the dispersion uniformity degree of pitch in the emulsion, and on the other hand, the two can promote the degree of stickiness of emulsion to a certain extent to improve emulsified asphalt's system stability. In addition, the addition of sucrose fatty acid ester and gum arabic also has a positive effect on the uniform mixing distribution of SBS and asphalt after demulsification.
A preparation method of high-solid-content rapid demulsification modified emulsified asphalt is used for preparing the high-solid-content rapid demulsification modified emulsified asphalt and comprises the following steps:
step 1: preparing a cationic compound emulsifier;
step 2: dissolving a cationic compound emulsifier, a stabilizer and a solubilizer by using hot water, uniformly mixing, and adjusting the pH value to be acidic by using a pH value regulator to obtain an emulsion;
and step 3: heating the base asphalt to a flowing state, preheating the colloid mill by using hot water with the same temperature as the emulsified liquid, pouring the emulsified liquid into the preheated colloid mill, adding the base asphalt while stirring, continuing to grind after adding the base asphalt, and adding the defoaming agent to obtain the emulsified asphalt.
And 4, step 4: and (3) adding SBS latex into the emulsified asphalt obtained in the step (3), and stirring to obtain the high-solid-content quick demulsification modified emulsified asphalt.
The invention preferably selects a preparation method of the high-solid-content quick demulsification modified emulsified asphalt, in the step 2, the stabilizer comprises an organic stabilizer, an inorganic stabilizer and gelatin, and the specific steps in the step 2 are as follows: heating the measured water to 85-95 ℃, dissolving the organic stabilizer in hot water, uniformly stirring, and slightly standing after the aqueous solution is changed from turbid to nearly transparent; when the temperature of the aqueous solution is reduced to 55-65 ℃, adding an inorganic stabilizer and gelatin; after dissolving, putting the mixture on a stirrer set to be 55-65 ℃, adding a cationic compound emulsifier, and stirring until the mixture is completely dissolved to obtain a mixed solution; adding powdered sucrose fatty acid ester and Arabic gum, and stirring to form a stable water solution system; and finally, regulating the pH value of the mixed solution to 2-3 by using a pH value regulator.
The invention preferably discloses a preparation method of high-solid-content quick demulsification modified emulsified asphalt, which comprises the following steps of 3, heating matrix asphalt to 130-150 ℃ to enable the matrix asphalt to be in a flowing state, circularly preheating a colloid mill to about 60-70 ℃ by using hot water, discharging the hot water after preheating is finished, wetting by using hot emulsion with equal concentration to replace residual water to ensure the concentration of the emulsion, pouring the emulsion into the preheated colloid mill, adding the matrix asphalt while stirring, grinding for 80-100s after the addition is finished, adding a defoaming agent, and controlling the temperature of the emulsified asphalt obtained after the preparation to be 70-80 ℃.
The invention preferably selects a preparation method of the high-solid-content quick demulsification modified emulsified asphalt, and the step 4 specifically comprises the following steps: and (3) adding SBS latex into the emulsified asphalt obtained in the step (3), and then stirring for 10-30min at the rotating speed of 300-800r/min by using an electric stirrer to fully and uniformly mix the emulsified asphalt and obtain the high-solid-content quick demulsification modified emulsified asphalt.
The SBS latex is white emulsion SBS, compared with a solid SBS modifier, the amount of the modifier is the same, the product is better, the operation is convenient, and excessive grinding is not needed.
The invention preferably discloses a preparation method of high-solid-content rapid demulsification modified emulsified asphalt, and also comprises a method for detecting the demulsification time of the high-solid-content rapid demulsification modified emulsified asphalt, which comprises the following steps:
step 1, forming a cement concrete cubic test block with the size of 100mm x 100mm, maintaining for 7 days, and demolding to obtain the target cement test block.
And 2, heating the cement concrete blocks by the electric heating blast dryer at the heat preservation temperature of 30-90 ℃ for 20-30min, and taking out.
And 3, uniformly and quickly smearing 10 +/-2 mL of high-solid-content quick demulsification modified emulsified asphalt on the surface of the cement concrete block by using a brush.
And 4, regarding the surface starting to change from gray to black as starting demulsification, regarding all the surfaces to change into black as finishing demulsification, and using a stopwatch to time the time used in the middle as demulsification time.
And 5, sequentially coating and timing 6 surfaces of the cube according to the steps, performing 6 groups of parallel experiments, and averaging the results to obtain the demulsification time.
The method for measuring the demulsification time of the emulsified asphalt overcomes the defect that the conventional demulsification detection completely depends on manual judgment, realizes quantitative measurement of the demulsification time of the emulsified asphalt, measures and averages 6 surfaces by manufacturing a cubic sample, and ensures the accuracy of the whole test.
The invention has the following advantages and beneficial effects:
1. the invention greatly improves the solid content of the emulsified asphalt by the synergistic action of the compounded emulsifier, solubilizer, pH value regulator and stabilizer on the premise of ensuring the emulsifying effect, ensures that the solid content is more than 62 percent and can reach 63.3 percent at most, can rapidly demulsify and also ensures the film-forming thickness.
2. The prepared cation compound emulsifier has better compatibility with matrix asphalt and better emulsification effect, forms oily emulsion in water, and can keep stable emulsification under the condition of high solid content.
3. The prepared emulsified asphalt has good compatibility with SBS latex and wide mixing proportion, and ensures the high and low temperature performance of the evaporation residues of the modified emulsified asphalt.
4. The invention develops a method for measuring the demulsification time of emulsified asphalt, which realizes the accurate measurement of the demulsification time of the emulsified asphalt, overcomes the defect of completely depending on manual qualitative judgment in the prior art and ensures that the test result is more accurate.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention.
FIG. 1 is a state diagram of the high solid content rapid demulsification modified emulsified asphalt in the demulsification time detection process of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
Step 1: heating the measured tap water to 90 ℃, firstly dissolving 1g of polyvinyl alcohol serving as an organic stabilizer in hot water, uniformly stirring, standing for 10min after the aqueous solution is changed from turbid to nearly transparent, and adding 1g of ferric chloride serving as an inorganic stabilizer and 1g of gelatin when the temperature of the aqueous solution is reduced to 60 ℃; after dissolution, place it on a magnetic stirrer set at 60 ℃ and add 5g of a compounded emulsifier, among which octadecylpropylenediamine: 1-aminoethyl-2-heptadecylimidazoline: 18331, stirring fully to dissolve completely, adding 3.1g of sucrose fatty acid ester and 3.1g of gum arabic, and stirring until a stable and uniform aqueous solution system is formed, wherein the mass ratio of the sucrose fatty acid ester to the gum arabic is 3; and finally, adjusting the pH value of the mixed solution to 3 by using 3g of hydrochloric acid to obtain an emulsion, wherein 18331 is N- (3-octadecylamino-2-hydroxy) -propyl-trimethyl ammonium chloride.
Step 2, 630g GS90 # Heating the matrix asphalt to 140 ℃ to enable the matrix asphalt to be in a flowing state, circularly preheating the colloid mill to 65 ℃ by using hot water, discharging the hot water after the preheating is finished, and infiltrating the water in the colloid mill by using hot emulsion.
And 3, pouring the emulsified liquid into a preheated colloid mill, adding the matrix asphalt while stirring, keeping grinding for 90s after the addition is finished, and spraying 1.5g of defoaming agent, wherein the temperature of the newly prepared emulsified asphalt is 70-80 ℃ after the preparation is finished, and if the emulsified asphalt is placed, the reduction speed of the internal temperature and the surface temperature of the emulsion is different, the surface moisture is seriously lost and crusted, so the emulsified asphalt needs to be stirred, the emulsified asphalt is well covered, and the moisture evaporation speed is reduced as much as possible. Standing for 30min, cooling the emulsified asphalt to room temperature, injecting into a sealed container, and storing in shade, wherein the total mass of the emulsified asphalt is 1000g.
And 4, adding 40g of SBS latex into the emulsified asphalt obtained in the step 3, wherein the solid content of SBS is 60%, and stirring for 15min at the rotating speed of 500r/min by using an electric stirrer to fully and uniformly mix, thus obtaining the modified emulsified asphalt with high solid content.
Table 1 shows the properties of the high-solid content rapid demulsification modified emulsified asphalt in example 1
Example 2
Step 1, heating metered tap water to 90 ℃, dissolving 1g of polyvinyl alcohol serving as an organic stabilizer in hot water, uniformly stirring, standing for 10min after the aqueous solution is changed from turbid to nearly transparent, adding 1g of ferric chloride and 1g of gelatin when the temperature of the aqueous solution is reduced to 60 ℃, placing the aqueous solution on a magnetic stirrer set to be 60 ℃ after dissolution, and adding 5g of a compound emulsifier, wherein the compound emulsifier is octadecyl propylene diamine: 1-aminoethyl-2-heptadecylimidazoline: 18331 is compounded according to the mass ratio of 3; continuing to add 3.1g of sucrose fatty acid ester and 3.1g of gum arabic, stirring until a stable and uniform aqueous solution system is formed, and finally adjusting the pH value of the mixed solution to 3 by using 3g of hydrochloric acid to obtain an emulsion, wherein no floating matters or agglomeration exist.
Step 2, 630g GS90 # Heating the matrix asphalt to 140 ℃ to enable the matrix asphalt to be in a flowing state, circularly preheating the colloid mill to about 65 ℃ by using hot water, and discharging the hot water after preheating is finished.
And 3, pouring the emulsified liquid into a preheated colloid mill, adding the matrix asphalt while stirring, keeping grinding for 90s after the addition is finished, and spraying 1.5g of defoaming agent, wherein the temperature of the newly prepared emulsified asphalt is 70-80 ℃ after the preparation is finished, and if the emulsified asphalt is placed, the reduction speed of the internal temperature and the surface temperature of the emulsion is different, the surface moisture is seriously lost and crusted, so the emulsified asphalt needs to be stirred, the emulsified asphalt is well covered, and the moisture evaporation speed is reduced as much as possible. Standing for 30min, cooling the emulsified asphalt to room temperature, injecting into a sealed container, and storing in shade, wherein the total mass of the emulsified asphalt is 1000g.
And 4, adding 60g of SBS latex into the emulsified asphalt obtained in the step 3, wherein the solid content of the SBS latex is 60%, and stirring for 15min at the rotating speed of 500r/min by using an electric stirrer after the latex is finished so as to fully and uniformly mix the latex and the SBS latex, so that the modified emulsified asphalt with high solid content can be obtained.
Table 2 shows the properties of the high-solid content rapid demulsification modified emulsified asphalt in example 2
Example 3
Step 1, heating metered tap water to 90 ℃, dissolving 1g of polyvinyl alcohol in hot water, uniformly stirring, standing for 10min after the aqueous solution is changed from turbid to nearly transparent, and adding 1g of ferric chloride and 1g of gelatin when the temperature of the aqueous solution is reduced to 60 ℃; after dissolution, place it on a magnetic stirrer set at 60 ℃ and add 5g of emulsifier, the compounded emulsifier is octadecylpropylenediamine: 1-aminoethyl-2-heptadecylimidazoline: 18331, mixing according to the mass ratio of 3; continuously adding 3.1g of sucrose fatty acid ester and 3.1g of Arabic gum, and stirring until a stable and uniform aqueous solution system is formed; and finally, adjusting the pH value of the mixed solution to 3 by using 3g of hydrochloric acid to obtain the emulsion, wherein the suspension is free of floating matters and agglomeration.
Step 2, 630g GS90 is prepared # Heating the base asphalt to 140 deg.C to make it be in flowing state, circularly preheating colloid mill to 65 deg.C with hot water, and discharging the hot water after preheating.
And 3, pouring the emulsified liquid into a preheated colloid mill, adding matrix asphalt while stirring, keeping grinding for 90s after adding, and then spraying 1.5g of defoaming agent, wherein the temperature of the newly prepared emulsified asphalt is generally 70 to 80 ℃ after preparation, and if the emulsified asphalt is placed, the reduction speed of the internal temperature and the surface temperature of the emulsion is different, the surface moisture is seriously lost and crusts, so the emulsified asphalt needs to be stirred, the emulsified asphalt is covered, and the moisture evaporation speed is reduced as much as possible. Standing for 30min, cooling the emulsified asphalt to room temperature, injecting into a sealed container, and storing in shade, wherein the total mass of the emulsified asphalt is 1000g.
And 4, adding 80g of SBS latex into the emulsified asphalt obtained in the step 3, wherein the solid content of the SBS latex is 60%, and then stirring the mixture for about 15min at the rotating speed of 500r/min by using an electric stirrer to fully and uniformly mix the mixture to obtain the modified emulsified asphalt with high solid content.
Table 3 shows the properties of the high solid content rapid demulsification modified emulsified asphalt in example 3
As can be seen from comparison of the detection results of the embodiments 1, 2 and 3, under the condition of too small SBS addition, 4% of the low temperature performance of the embodiment 1 cannot be guaranteed, which means that the ductility cannot meet the requirement at 5 ℃, and the solid content of the modified emulsified asphalt is slightly reduced along with the increase of the SBS latex addition, but the high and low temperature performance is obviously improved, and the demulsification time is slightly prolonged along with the gradual increase of the SBS latex addition, but the demulsification time still meets the current quick-cracking requirement, and other performances also meet the technical requirement of synchronously paving an ultrathin wearing layer.
Example 4
This example differs from example 3 in that the emulsifier employed is a fast-breaking emulsifier, octadecylpropylenediamine.
Example 5
This example differs from example 3 in that the emulsifier is compounded with two fast-breaking emulsifiers, octadecylpropylenediamine and 1-aminoethyl-2-heptadecylimidazoline.
Example 6
This example differs from example 3 in that the emulsifier used was all N- (3-octadecylamino-2-hydroxy) -propyl-trimethylammonium chloride, a mid-burst emulsifier.
Example 7
The difference between the present example and example 3 is that the emulsifier adopts a fast-breaking emulsifier and a medium-breaking emulsifier, and the mass ratio of the fast-breaking emulsifier to the medium-breaking emulsifier is 4.5.
The results of the demulsification time and 1d stability tests of examples 3-7 are shown in Table 4 below.
TABLE 4 demulsification time and 1d stability test results of examples 3-7
Note: a-octadecylpropylenediamine, B-1-aminoethyl-2-heptadecylimidazoline, C-N- (3-octadecylamino-2-hydroxy) -propyl-trimethylammonium chloride.
According to the invention, through the blending of multiple emulsifiers, when all fast-cracking emulsifiers are adopted, the storage stability is poor, and when all medium-cracking emulsifiers are adopted, the demulsification speed is slow, so that from the comprehensive consideration of the demulsification time and the stability, a large amount of fast-cracking emulsifiers and a small amount of medium-cracking emulsifiers are selected for operation, and 2 fast-cracking emulsifiers and 1 medium-cracking emulsifier are selected for cooperation through comparison to obtain the modified emulsified asphalt with excellent demulsification time and stability.
Example 8 to example 10
Example 8 differs from example 3 in that no solubilizer is added, example 9 differs from example 3 in that the sucrose fatty acid ester is added alone, and example 10 differs from example 3 in that gum arabic is added alone, and the resulting properties are shown in table 5.
Table 5 shows the properties of the high-solid content rapid demulsification modified emulsified asphalt in examples 8-10
As can be seen from the comparison of example 3 with examples 8-10 above, the addition of sucrose fatty acid ester and gum arabic resulted in a slightly lower oversize of the emulsified asphalt, indicating a reduction in agglomerated asphalt residues; the content of the evaporation residue and the softening point are slightly increased, the penetration degree is slightly reduced, and the storage stability is higher, which means that the two can improve the comprehensive performance of the emulsified asphalt to a certain extent.
The demulsification time detection method in the embodiment comprises the following steps:
step 1, forming a cement concrete cube test block with the size of 100mm x 100mm, maintaining for 7 days, and demolding to obtain the target cement test block.
And 2, heating the cement concrete blocks by adopting an electric heating air blast dryer, keeping the temperature at 30-90 ℃, heating and keeping the temperature for 20-30min, and taking out.
And 3, uniformly and quickly smearing 10 +/-2 mL of high-solid-content quick demulsification modified emulsified asphalt on the surface of the cement concrete block by using a brush.
And 4, regarding the surface starting to change from gray to black as starting demulsification, regarding all the surfaces to change into black as finishing demulsification, and using a stopwatch to time the time used in the middle as demulsification time.
And 5, sequentially coating and timing 6 surfaces of the cube according to the steps, performing 6 groups of parallel experiments, and averaging the results.
The picture of the demulsification time test of the high-solid content rapid demulsification modified emulsified asphalt is shown in figure 1.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The high-solid-content quick demulsification modified emulsified asphalt is characterized by comprising emulsified asphalt and SBS latex, wherein the addition amount of the SBS latex is 5-10% of the mass of the emulsified asphalt, and the emulsified asphalt comprises the following components in percentage by mass:
58-65% of matrix asphalt, 0.3-0.6% of cationic compound emulsifier, a pH value regulator, 0.2-0.5% of stabilizer, a defoaming agent, a solubilizer accounting for 1.0-1.5% of the mass of the matrix asphalt, and the balance of water, wherein the solubilizer is a mixture of sucrose fatty acid ester and gum arabic, and the cationic compound emulsifier comprises a mid-splitting emulsifier and at least one fast-splitting emulsifier.
2. The high-solid-content quick demulsification modified emulsified asphalt as claimed in claim 1, wherein the quick-breaking emulsifier is one or a mixture of an alkylamine quick-breaking emulsifier and an imidazoline quick-breaking emulsifier, and the medium-breaking emulsifier is a quaternary ammonium salt emulsifier.
3. The high-solid-content quick demulsification modified emulsified asphalt as claimed in claim 2, wherein the alkylamine quick-breaking emulsifier is octadecylpropylenediamine; the imidazoline fast-cracking emulsifier is 1-aminoethyl-2-heptadecyl imidazoline; the quaternary ammonium salt emulsifier is N- (3-octadecylamino-2-hydroxy) -propyl-trimethyl ammonium chloride, and the mass ratio of the N- (3-octadecylamino-2-hydroxy) -propyl-trimethyl ammonium chloride to the N- (3-octadecylamino-2-hydroxy) -trimethyl ammonium chloride is (3).
4. The high-solid content rapid demulsification modified emulsified asphalt as claimed in any one of claims 1 to 3, wherein the mass ratio of the sucrose fatty acid ester to the gum arabic is 1.
5. The high-solid-content rapid demulsification modified emulsified asphalt as claimed in any one of claims 1-3, wherein the SBS content in the SBS latex is 50-70%.
6. A preparation method of the high-solid content rapid demulsification modified emulsified asphalt is used for preparing the high-solid content rapid demulsification modified emulsified asphalt as claimed in any one of claims 1 to 5, and comprises the following steps:
step 1: preparing a cationic compound emulsifier;
step 2: dissolving a cationic compound emulsifier, a stabilizer and a solubilizer by using hot water, uniformly mixing, and adjusting the pH value to be acidic by using a pH value regulator to obtain an emulsion;
and step 3: heating the base asphalt to a flowing state, preheating a colloid mill by using hot water with the same temperature as the emulsified liquid, pouring the prepared emulsified liquid into the preheated colloid mill, adding the base asphalt while stirring, continuing to grind after the addition is finished, and adding a defoaming agent to obtain emulsified asphalt;
and 4, step 4: and (3) adding SBS latex into the emulsified asphalt obtained in the step (3), and stirring to obtain the high-solid-content quick demulsification modified emulsified asphalt.
7. The method for preparing the high-solid-content rapid demulsification modified emulsified asphalt as claimed in claim 6, wherein in the step 2, the stabilizer comprises an organic stabilizer, an inorganic stabilizer and gelatin, and the specific steps of the step 2 are as follows: heating the measured water to 85-95 ℃, dissolving the organic stabilizer in hot water, uniformly stirring, and standing after the aqueous solution is changed from turbid to nearly transparent; when the temperature of the aqueous solution is reduced to 55-65 ℃, adding an inorganic stabilizer and gelatin; after dissolving, putting the mixture on a stirrer set to be 55-65 ℃, adding a cationic compound emulsifier, and stirring until the mixture is completely dissolved; adding sucrose fatty acid ester and gum arabic, and continuously stirring until a stable aqueous solution system is formed; and finally, regulating the pH value of the mixed solution to 2-3 by using a pH value regulator.
8. The method for preparing high-solid content quick demulsification modified emulsified asphalt as claimed in claim 6 or 7, wherein in the step 3, the base asphalt is heated to 130-150 ℃ to be in a flowing state, then the colloid mill is circularly preheated to 60-70 ℃ by hot water, after preheating is finished, the hot water is discharged, then the hot emulsified asphalt with equal concentration is used for wetting, the residual water is replaced to ensure the concentration of the emulsified asphalt, then the emulsified asphalt is poured into the preheated colloid mill, the base asphalt is added while stirring, after the addition is finished, the grinding is kept for 80-100s, then the defoaming agent is added, and the temperature of the emulsified asphalt obtained after preparation is 70-80 ℃.
9. The preparation method of the high-solid-content rapid demulsification modified emulsified asphalt as claimed in claim 6 or 7, wherein the specific steps of the step 4 are as follows: and (3) adding SBS latex into the emulsified asphalt obtained in the step (3), and then stirring for 10-30min at the rotating speed of 300-800r/min by using an electric stirrer to fully and uniformly mix the emulsified asphalt and obtain the high-solid-content quick demulsification modified emulsified asphalt.
10. The method for preparing the high-solid content rapid demulsification modified emulsified asphalt as claimed in claim 6 or 7, further comprising the following method for detecting the demulsification time of the high-solid content rapid demulsification modified emulsified asphalt:
step 1, forming a cement concrete cubic test block, curing, and demolding to obtain a target cement test block;
step 2, heating the cement concrete block obtained in the step 1, keeping the temperature at 30-90 ℃, heating and keeping the temperature for 20-30min, and taking out;
step 3, uniformly and quickly smearing 10 +/-2 mL of high-solid-content quick demulsification modified emulsified asphalt on the surface of the cement concrete block by using a brush;
step 4, the surface begins to change from gray to black to be regarded as beginning to break emulsion, all changes to black are regarded as finishing breaking emulsion, the time length used in the middle of timing with the stopwatch is the time of breaking emulsion;
and 5, sequentially coating 6 surfaces of the cube according to the steps 1-4 for timing, performing 6 groups of parallel experiments, and averaging the results to obtain the demulsification time.
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