CN115057657B

CN115057657B - Ultrathin wearing layer paving method based on high-viscosity emulsified asphalt

Info

Publication number: CN115057657B
Application number: CN202210755187.0A
Authority: CN
Inventors: 杨海燕; 赵品晖; 张培勇; 盛轩; 王龙飞; 栾兆福; 王晨龙
Original assignee: Yantai Highway Development Center; Shandong Jianzhu University
Current assignee: Yantai Highway Development Center; Shandong Jianzhu University
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2023-03-21
Anticipated expiration: 2042-06-30
Also published as: CN115057657A

Abstract

The invention discloses a method for paving an ultrathin wearing layer based on high-viscosity emulsified asphalt, and belongs to the field of road engineering. The paving method comprises the following steps: s1, spreading high-viscosity emulsified asphalt on an original road surface to form a bonding layer; s2, paving and compacting the embedded warm-mixed asphalt mixture. The high-viscosity emulsified asphalt is prepared from hard petroleum asphalt, SBS latex, rubber powder dispersion, hydrogenated tallow methyl benzyl ammonium chloride modified nano-silica, methyl glucoside polyoxyethylene ether dioleate, hydrochloric acid and water according to a specific proportion, and has the outstanding advantages of good storage stability, high demulsification speed, strong cohesive force, good high-temperature performance, good durability, no wheel sticking and the like. The ultrathin wearing layer not only has the outstanding advantages of water resistance, skid resistance, wear resistance and the like, but also can be constructed by conventional equipment and integrated equipment, so that the technical threshold and the investment cost of the ultrathin wearing layer are reduced, and the ultrathin wearing layer has good popularization and application values.

Description

Ultrathin wearing layer paving method based on high-viscosity emulsified asphalt

Technical Field

The invention relates to the field of road engineering, and particularly provides a method for paving an ultrathin wearing layer based on high-viscosity emulsified asphalt and a preparation method thereof.

Background

The ultrathin wearing layer is an asphalt pavement surface layer technology combining an asphalt mixture and a modified emulsified asphalt adhesive layer, and can efficiently and reliably solve the problems of medium and light cracks, loose pavement, skid resistance, failure and the like. The technology can reduce the thickness to 1/3-1/2 (less than or equal to 25 mm) of the thickness of the traditional asphalt cover surface on the premise of reaching the same service performance of the pavement, greatly reduces the cost of pavement maintenance engineering, can save the manufacturing cost and the maintenance cost by 30-40 percent based on the analysis of the economic benefit of the pavement equity full life cycle, and has remarkable social and economic benefits. However, the ultra-thin wearing layer is thin and easy to cool, so that the compaction effect of the mixture is not ideal, the void ratio is reduced quickly after the road surface is communicated, the anti-skid property of the road surface is reduced quickly, traffic accidents are easily caused, and the traffic safety is influenced. On the other hand, present ultra-thin wearing course is mostly open gradation or half open gradation bituminous mixture, need spread the emulsified asphalt adhesion coating between the layer, and adhesion coating emulsified asphalt quality directly influences the bonding effect, is taken away by the wheel in order to prevent the adhesion coating, needs to adopt integrated construction equipment, and this equipment is not yet made in China, and is expensive.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a method for paving an ultrathin wearing layer based on high-viscosity emulsified asphalt with high cohesiveness, high durability and skid resistance.

The technical scheme adopted by the invention for solving the technical problems is as follows: the method for paving the ultrathin wearing layer based on the high-viscosity emulsified asphalt comprises the following steps:

s1, spreading high-viscosity emulsified asphalt on the original road surface to form a bonding layer,

the high-viscosity emulsified asphalt is prepared from the following raw materials in percentage by mass:

s2, paving and compacting the embedded warm-mixed asphalt mixture.

In the high-viscosity emulsified asphalt, the hard petroleum asphalt is the main part of the high-viscosity emulsified asphalt-based ultrathin wearing layer paving method, provides the viscosity and the softening point which are necessary for the high-viscosity emulsified asphalt-based ultrathin wearing layer paving method, and is a main contributor to high binding power and high-temperature performance; the SBS particles in the SBS latex, the rubber powder particles in the rubber powder dispersion liquid and the medium asphalt particles in the emulsified asphalt can form a uniform dispersion system, so that the stability of the latex is ensured, and meanwhile, after demulsification, the asphalt particles, the SBS particles and the rubber powder particles are mutually bonded, filled and polymerized to form an integral viscoelastic material which has good bonding force, high-temperature performance and durability; the material of the bihydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide and methyl glucoside polyoxyethylene ether dioleate has certain surface activity and nanoscale stability, and the materials have synergistic effect, so that the surface tension can be reduced, the formation of an asphalt emulsion is facilitated, and the effect of keeping the emulsion stable for a long time can be achieved. Due to the specific structural properties of the substances, the dispersibility of the substances in water is improved through high-temperature acidification treatment, and meanwhile, polar functional groups are protonated, so that the emulsification effect is better played. In addition, due to specific straight chain structures and basic functional groups of a plurality of substances, the emulsion breaking agent has strong adsorption effect after contacting with a base material, can be used for quickly breaking emulsion and meets construction requirements.

Preferably, the high-viscosity emulsified asphalt comprises the following raw materials in percentage by mass:

preferably, the hard petroleum asphalt has a penetration degree of 10-30 (0.1 mm), a softening point of more than 60 ℃, and can be prepared from low-grade asphalt produced by a distillation method or by solvent deasphalting.

Preferably, the SBS mass percent in the SBS latex is more than 50wt%, and the S/B block ratio is preferably 3.

Preferably, the rubber powder dispersion liquid consists of rubber powder, a suspending agent, a dispersing agent and water, the mass ratio of the rubber powder to the suspending agent to the dispersing agent to the water is 10 (0.5-1.5) to (1-3), and the mass percentage of the rubber powder is not less than 70%. The particle size of the rubber powder is 30-60 meshes. The suspending agent is preferably magnesium aluminium silicate. The dispersant is preferably sodium polyacrylate. Under the action of the dispersant and the suspending agent, the problem that the rubber powder has large specific surface and is difficult to disperse in the emulsion is solved, so that the rubber powder is easier to disperse in the emulsified asphalt.

Preferably, the nano-silica modified by the ammonium di-hydrogenated tallow methyl benzyl chloride is obtained by modifying the nano-silica by the ammonium di-hydrogenated tallow methyl benzyl chloride. The preparation method comprises the following steps:

dissolving 4-6wt% of di-hydrogenated tallow methyl benzyl ammonium chloride in hydrochloric acid aqueous solution with the temperature of 75-90 ℃ and the pH value of 2-3 to obtain solution a;

adding 18-22wt% of nano silicon dioxide into the water-soluble glycerol, uniformly stirring, and heating to 75-90 ℃ to obtain a suspension b;

and (3) mixing the solution a and the suspension b according to the mass ratio of 1 (0.8-1.2), reacting at 75-90 ℃ for 12-36 hours, removing water after the reaction is finished, and drying and activating in vacuum for 8-16 hours to obtain the dihydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide. The activation temperature is preferably from 100 to 110 ℃ and particularly preferably from 103 to 107 ℃.

Preferably, the hydrochloric acid is concentrated hydrochloric acid, and the concentration of the concentrated hydrochloric acid is 36% -38%.

Preferably, the preparation method based on the high-viscosity emulsified asphalt comprises the following steps:

s1, adding di-hydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide and methyl glucoside polyoxyethylene ether dioleate into a hydrochloric acid aqueous solution at the temperature of 80-90 ℃ to obtain a soap solution with the pH value of 1-3, and then cooling to 50-60 ℃ in a natural state for later use;

s2, heating the hard asphalt to 155-170 ℃ for later use;

s3, sending the soap solution and the asphalt to a colloid mill, grinding by the colloid mill, and carrying out heat exchange and cooling to obtain hard emulsified asphalt;

s4, mixing and stirring SBS latex, rubber powder dispersion liquid and hard emulsified asphalt to obtain pre-dispersed emulsion; and grinding the pre-dispersed emulsion by a colloid mill to obtain the high-viscosity emulsified asphalt.

Preferably, step S1 is specifically:

firstly, adding hydrochloric acid into water at room temperature, adjusting the pH value of the water to be about 2 +/-0.5, then heating the water to 80-90 ℃, keeping the temperature, slowly adding the double hydrogenated tallow methyl benzyl ammonium chloride modified nano-silica and methyl glucoside polyoxyethylene ether dioleate under the stirring state, continuing stirring for 30min, supplementing the hydrochloric acid to adjust the pH value of the solution to be about 2 +/-0.5, obtaining soap solution, and then cooling the solution to be about 50-60 ℃ under the natural state for later use.

Preferably, step S3 includes:

s31, preheating a colloid mill grinding head, an asphalt pipeline and a soap liquid pipeline;

s32, improving the pressure of the asphalt pipeline, the soap liquid pipeline and the outlet of the colloid mill, and adjusting the pressure of the outlet of the colloid mill to 0.15-0.25MPa, wherein under the condition, the boiling point of water is increased to about 110 ℃, so that the phenomenon of local demulsification caused by instantaneous evaporation of water at the outlet of the colloid mill can be avoided.

Preferably, in step S31, the colloid mill grinding head is preheated to 100-120 ℃, the asphalt pipeline is preheated to 150-170 ℃, and the soap solution pipeline is preheated to 50-60 ℃.

Preferably, step S32 includes: and cooling the emulsified asphalt which is subjected to the colloid mill by a heat exchanger, wherein the temperature of cooling water is room temperature.

Preferably, the embedded solid type warm mix asphalt mixture is formed by mixing 5.5-8.5% of warm mix high-viscosity modified asphalt, 0.l-0.5% of 5mm-7mm chopped untwisted polyester fiber, 70-75% of coarse aggregate, 15-20% of fine aggregate and 6-12% of filler in percentage by mass, and particularly preferably formed by mixing 5.5-6.5% of warm mix high-viscosity modified asphalt, 0.l-0.3% of 5mm-7mm chopped untwisted polyester fiber, 70-73% of coarse aggregate, 15-18% of fine aggregate and 6-8% of filler.

Preferably, the warm-mixed high-viscosity modified asphalt is prepared by mixing 80-90% of AH-70 asphalt, 10-16% of high-viscosity asphalt modifier, 0.02-0.04% of stabilizer, 0.4-0.8% of compatilizer and 0.4-1.0% of warm-mixed agent in percentage by mass.

The high-viscosity modifier is composed of C ₉ The rubber powder is prepared by mixing petroleum resin, polystyrene-polybutadiene block copolymer SBS, rubber powder, solid rosin and talcum powder, and the using amounts of the raw materials are as follows by mass percent:

the stabilizer is sulfur stabilizer, such as modified asphalt stabilizer of Dongying Runfeng Boyue Stone oil technology Limited.

The compatilizer is extract oil.

The warm mixing agent is palmitic acid imidazoline warm mixing agent and is obtained by two-step reaction of amidation and cyclization of palmitic acid and tetraethylenepentamine.

In the above warm-mix high-viscosity modified asphalt, the component C ₉ The petroleum resin has the main function of increasing viscosity, the SBS and the rubber powder have good tackifying and viscoelastic properties, and the solid rosin can enable C to be ₉ Molecular chains of the petroleum resin, the SBS and the rubber powder are lubricated and can be better fused together to play a synergistic effect. And the talcum powder can prevent the adhesion in the preparation process of the modifier. The high-viscosity modifier prepared by the method has excellent high-viscosity modification effect on asphalt, and can be used for preparing high-performance cementing materials meeting the requirements of open-graded or semi-open-concentrated asphalt mixtures. The chosen palmitic acid imidazoline warm mixing agent can be very easily dissolved in the high-viscosity asphalt due to a specific molecular structure, is adsorbed by the high-viscosity modifier and has an intermolecular lubricating effect, so that the friction effect in the mixing process of the mixture is effectively reduced, and the adopted high-viscosity asphalt mixture is relatively low in temperatureAnd (5) performing next construction. The chopped untwisted polyester fibers have good dispersibility in the mixture, reduce the void ratio of the mixture by 1-2%, and have the functions of tackifying, stabilizing asphalt and increasing an oil film, and improve the leakage loss and the scattering loss of the mixture, so that the toughness and the durability of the embedded warm-mix high-viscosity asphalt mixture are improved. In addition, because of strong cohesive force among asphalt molecules, the warm-mixing high-viscosity asphalt mixture and the demulsified high-viscosity asphalt can be firmly adhered to the original pavement, and have strong adhesive strength and interlaminar shear strength, so that the structural integrity is formed, the stability and durability of the pavement can be improved, the adhesive property is high, and the pavement performance of the ultra-thin wearing layer of the asphalt is further improved.

Preferably, the coarse aggregate is basalt or/and diabase macadam with nominal maximum grain diameter of 9.5mm and mesh passing rate of 4.75mm less than 5%, wherein the content of macadam with grain diameter of 6.7mm-9.5mm is more than 65%; the fine aggregate is machine-made sand or stone chips processed by alkaline or neutral stone with the 2.36mm sieve-hole passing rate of more than 95 percent and the 0.075mm sieve-hole passing rate of less than 8 percent; the filler comprises limestone mineral powder and slaked lime or cement with the content of less than 2 percent.

In the embedded solid type warm mix asphalt mixture, the dense type discontinuous gradation is finally formed in the warm mix high-viscosity asphalt mixture by adjusting gradation and chopped untwisted polyester fibers, wherein the passing percentage of a 9.5mm sieve pore is 92-100%, the passing percentage of a 4.75mm sieve pore is 24-34%, the passing percentage of a 2.36mm sieve pore is 21-32%, the passing percentage of a 1.18mm sieve pore is 13-27%, the passing percentage of a 0.6mm sieve pore is 10-24%, the passing percentage of a 0.3mm sieve pore is 5-18%, the passing percentage of a 0.15mm sieve pore is 7-12%, and the passing percentage of a 0.075mm sieve pore is 5-9%. The porosity of the mixture is between 3 and 4 percent and the thickness of an oil film is more than 10 mu m by adjusting the using amount of the warm-mixed high-viscosity modified asphalt.

Preferably, the method for paving the ultrathin wearing layer based on the high-viscosity emulsified asphalt comprises the following construction steps:

s1, cleaning an original pavement and treating diseases;

s2. The temperature on the road surface is not lower than 5 DEG CUnder the condition, 0.3L/m of the pavement is spread on the original pavement ² -1.2L/m ² The high-viscosity emulsified asphalt bonding layer;

s3, paving a layer of embedded warm-mixed high-viscosity modified asphalt mixture with the thickness of 1.6-3.0 cm on the bonding layer, wherein the paving temperature is 115-155 ℃.

And S4, rolling, embedding and compacting the warm-mixed high-viscosity modified asphalt mixture paved in the step S3 by using a rubber-wheel road roller at the temperature of 90-145 ℃ to form a road ultrathin wearing layer with the thickness of l.5cm-2.5 cm.

Compared with the prior art, the ultrathin wearing layer paving method based on the high-viscosity emulsified asphalt and the preparation method thereof have the following outstanding beneficial effects:

after the modified di-hydrogenated tallow methyl benzyl ammonium chloride, the dispersibility of the nano silicon dioxide in water and emulsion is greatly improved, the interface strength of the emulsion is enhanced, a stabilizing effect is achieved, the viscoelasticity and the toughness of the paving method of the ultrathin wearing layer based on the high-viscosity emulsified asphalt can be further improved, and the durability of the paving method of the ultrathin wearing layer based on the high-viscosity emulsified asphalt is improved.

The di-hydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide and methyl glucoside polyoxyethylene ether dioleate are insoluble in water, and the invention ensures that all substances play a synergistic effect through high-temperature acidification treatment, thereby being capable of dispersing in water and playing a good role in emulsification and stabilization.

And (III) the hard asphalt can be emulsified at a higher temperature to obtain the emulsified asphalt with good stability.

(IV) the SBS particles in the SBS latex, the rubber powder particles in the rubber powder dispersion liquid and the medium asphalt particles in the emulsified asphalt have the same order of magnitude on the granularity size through the dispersion and the shearing and grinding action of a colloid mill, so that the SBS and the rubber powder can be uniformly dispersed in the asphalt to form a homogeneous material, the emulsion has better stability, a uniform system is formed after emulsion breaking, the synergistic action of all the materials is fully exerted, and good high cohesiveness, high durability and high-temperature stability are realized;

(V) pipeline pressurization treatment is adopted, and differential pressure pumping is utilized to ensure that asphalt is conveyed to the colloid mill, and simultaneously the blockage of the colloid mill by the asphalt is avoided to cause 'paste milling'; the purpose of the pressurization and heat exchange treatment at the outlet of the colloid mill is to reduce the boiling point of the outlet emulsion and simultaneously rapidly cool the emulsion, so that the gasification of water in the emulsion can be prevented, the emulsion is prevented from generating a bumping phenomenon, and the quality of emulsified asphalt is influenced.

And (VI) the performance of the ultrathin wearing layer under the cooling construction can be ensured, so that the toughness and the durability of the ultrathin wearing layer are effectively improved.

(VII) the combined structure design of the high-viscosity emulsified asphalt bonding layer and the warm-mixed high-viscosity asphalt mixture enables a mixture system to have good viscoelasticity, the problem of reflection cracks is solved, meanwhile, the use of the high-viscosity asphalt solves the problems of particle loosening and particle falling caused by the small cohesive force of mineral aggregate of the ultra-thin wearing layer due to the high bonding force of the high-viscosity emulsified asphalt after emulsion breaking, and the problem of insufficient interlayer bonding performance of the wearing layer and the lower lying layer is further solved due to the high bonding property of the high-viscosity emulsified asphalt after emulsion breaking; in addition, the overall combined structure design and the road performance such as high-temperature performance, low-temperature performance, fatigue performance and the like of the mixture can be obviously improved after the fibers are added into the warm-mixed high-viscosity asphalt mixture, and the service performance and service life of the ultrathin wearing layer are improved.

Detailed Description

The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

Description of materials in the examples of the invention:

hard petroleum asphalt: HA-15 type hard petroleum asphalt, the penetration degree is 18 (0.1 mm), and the softening point is 70 ℃;

SBS latex: the mass percent of SBS is 50wt%, and the block ratio S/B is 3;

hydrochloric acid: chemically pure, concentration 37%.

Rubber powder dispersion liquid: the rubber powder, the suspending agent, the dispersing agent and water are in a mass ratio of 10;

polystyrene-polybutadiene block copolymer SBS: linear SBS (791H);

sulfur-based stabilizer: the modified asphalt stabilizer is purchased from Dongying Runfeng Boyu stone oil technology Co.

Example 1:

the preparation method of the bihydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide comprises the following steps:

s1, firstly, adding concentrated hydrochloric acid into water at room temperature to adjust the pH value to 2-3, then heating the concentrated hydrochloric acid to 80 ℃, keeping the temperature, and slowly adding 5wt% of dihydrogenated tallow methyl benzyl ammonium chloride under the stirring state to completely dissolve the ammonium chloride to obtain a solution a for later use;

s2, adding 20wt% of nano-scale dioxide into the water-soluble glycerol, uniformly stirring, and heating to 80 ℃ to obtain a suspension b for later use;

s3, adding the solution a and the suspension b into a three-neck flask according to the mass ratio of 1;

and S4, after the reaction is finished, removing water, and putting the reaction product into a vacuum drying oven at 105 ℃ for drying and activating for 12 hours to obtain the double-hydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide.

Example 2:

the raw materials adopted in the high-viscosity emulsified asphalt are as follows:

55wt% of hard petroleum asphalt, 3wt% of SBS latex, 4wt% of rubber powder dispersion, 0.5wt% of double hydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide, 1.5wt% of methyl glucoside polyoxyethylene ether dioleate, 0.4wt% of hydrochloric acid and 36.6wt% of water.

The preparation method of the high-viscosity emulsified asphalt comprises the following steps:

1. firstly, adding hydrochloric acid into water at room temperature, adjusting the pH value of the water to be about 2 +/-0.5, then heating the water to 85 ℃, keeping the temperature, slowly adding the double-hydrogenated tallow methyl benzyl ammonium chloride modified nano-silica and methyl glucoside polyoxyethylene ether dioleate under the stirring state, continuing stirring for 30min, supplementing the hydrochloric acid to adjust the pH value of the solution to be about 2 +/-0.5, obtaining soap solution, and then cooling the solution to 55 ℃ under the natural state for later use.

2. Heating the hard asphalt to 160 ℃ for standby;

3. the grinding head of the colloid mill is heated to 110 ℃, the asphalt pipeline is heated to 160 ℃, and the temperature of the soap liquid pipeline is 55 ℃. Opening the emulsified asphalt colloid mill, opening an asphalt pump and a soap lye pump, respectively adjusting the pressure of an asphalt pipeline and the pressure of a soap lye pipeline to 0.25MPa and 0.15MPa, and adjusting the outlet pressure of the colloid mill to 0.2MPa in a self-circulation state. Meanwhile, the emulsified asphalt heat exchange device is opened, and the temperature of cooling water is kept at about 20 ℃. And finally, pumping the soap solution and the asphalt to a colloid mill in sequence, grinding by the colloid mill, and carrying out heat exchange and cold cutting to obtain the hard emulsified asphalt.

4. And adding the SBS latex and the rubber powder dispersion liquid into the hard emulsified asphalt at room temperature under a stirring state, and performing pre-dispersion emulsion for 30min. Meanwhile, the power supply of the whole system of the colloid mill is turned off, the temperature of the pipeline and the temperature of the grinding head of the colloid mill are restored to the room temperature state, and the pressure of the pipeline is restored to the atmospheric pressure. And adding the pre-dispersion emulsion into a colloid mill asphalt tank, opening an asphalt pump for self-circulation, adjusting the pressure of an asphalt pipeline to be 0.15MPa, opening a colloid mill (a grinding head is heated and closed, the pressure of an outlet of the colloid mill is atmospheric pressure, a heat exchange device is closed), pumping the pre-dispersion emulsion into the colloid mill, and grinding by the colloid mill to obtain the high-viscosity emulsified asphalt.

Example 3:

the raw materials adopted in the high-viscosity emulsified asphalt are as follows: 55wt% of hard petroleum asphalt, 3wt% of SBS latex, 4wt% of rubber powder dispersion, 1.0wt% of double hydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide, 1.5wt% of methyl glucoside polyoxyethylene ether dioleate, 0.5wt% of hydrochloric acid and 35wt% of water.

The preparation method of the high viscosity emulsified asphalt in this example is the same as that of example 2.

Example 4:

the raw materials adopted in the high-viscosity emulsified asphalt are as follows: 55wt% of hard petroleum asphalt, 3wt% of SBS latex, 4wt% of rubber powder dispersion, 1.5wt% of double hydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide, 1.5wt% of methyl glucoside polyoxyethylene ether dioleate, 0.6wt% of hydrochloric acid and 34.4wt% of water.

Example 5:

the raw materials adopted in the high-viscosity emulsified asphalt are as follows: 55wt% of hard petroleum asphalt, 3wt% of SBS latex, 2wt% of rubber powder dispersion, 1.0wt% of double hydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide, 1.5wt% of methyl glucoside polyoxyethylene ether dioleate, 0.5wt% of hydrochloric acid and 39wt% of water.

Example 6:

the raw materials adopted in the high-viscosity emulsified asphalt are as follows: 55wt% of hard petroleum asphalt, 3wt% of SBS latex, 6wt% of rubber powder dispersion, 1.0wt% of double hydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide, 1.5wt% of methyl glucoside polyoxyethylene ether dioleate, 0.5wt% of hydrochloric acid and 33wt% of water.

Example 7:

the raw materials adopted in the high-viscosity emulsified asphalt are as follows: 55wt% of hard petroleum asphalt, 3wt% of SBS latex, 8wt% of rubber powder dispersion, 1.0wt% of double hydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide, 1.5wt% of methyl glucoside polyoxyethylene ether dioleate, 0.5wt% of hydrochloric acid and 31wt% of water.

Example 8:

the raw materials adopted in the high-viscosity emulsified asphalt are as follows: 55wt% of hard petroleum asphalt, 4wt% of SBS latex, 4wt% of rubber powder dispersion, 1.0wt% of double hydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide, 1.5wt% of methyl glucoside polyoxyethylene ether dioleate, 0.5wt% of hydrochloric acid and 34wt% of water.

Comparative example 1:

the high-viscosity emulsified asphalt adopts the following raw materials: 55wt% of hard petroleum asphalt, 3wt% of SBS latex, 4wt% of rubber powder dispersion, 2.5wt% of methyl glucoside polyoxyethylene ether dioleate, 0.5wt% of hydrochloric acid and 35wt% of water.

The preparation method of the high-viscosity emulsified asphalt in the comparative example is the same as that in example 2, except that the nano silicon dioxide modified by the di-hydrogenated tallow methyl benzyl ammonium chloride is not added.

Comparative example 2:

the high-viscosity emulsified asphalt adopts the following raw materials: 55wt% of hard petroleum asphalt, 3wt% of SBS latex, 4wt% of rubber powder dispersion, 2.5wt% of bihydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide, 0.5wt% of hydrochloric acid and 35wt% of water.

The preparation method of the high-viscosity emulsified asphalt of the comparative example is the same as that of example 2, except that methyl glucoside polyoxyethylene ether dioleate is not added.

Comparative example 3:

the high-viscosity emulsified asphalt adopts the following raw materials: 55wt% of hard petroleum asphalt, 7wt% of SBS latex, 1.0wt% of double hydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide, 1.5wt% of methyl glucoside polyoxyethylene ether dioleate, 0.5wt% of hydrochloric acid and 35wt% of water.

The preparation method of the high-viscosity emulsified asphalt of this comparative example is the same as that of example 2 except that the rubber powder dispersion is not added.

Comparative example 4:

the high-viscosity asphalt adopts the following raw materials: 55wt% of hard petroleum asphalt, 7wt% of rubber powder dispersion liquid, 1.0wt% of double hydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide, 1.5wt% of methyl glucoside polyoxyethylene ether dioleate, 0.5wt% of hydrochloric acid and 35wt% of water.

The procedure for preparing the high-viscosity asphalt of this comparative example was the same as that of example 2 except that SBS latex was not added.

Comparative example 5:

the raw materials adopted in the high-viscosity asphalt are as follows: 60wt% of hard petroleum asphalt, 1.0wt% of double hydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide, 1.5wt% of methyl glucoside polyoxyethylene ether dioleate, 0.5wt% of hydrochloric acid and 37wt% of water.

The preparation method of the high-viscosity asphalt of the comparative example is the same as the steps 1 to 3 of the example 2, except that the SBS latex and the rubber powder dispersion liquid are not added.

Comparative example 6:

the high-viscosity asphalt adopts the following raw materials: 60wt% of AH-70 asphalt, 1.0wt% of double hydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide, 1.5wt% of methyl glucoside polyoxyethylene ether dioleate, 0.5wt% of hydrochloric acid and 37wt% of water.

The steps of the preparation method of the high-viscosity asphalt of the comparative example are the same as the steps 1 to 3 of the example 2, and the differences are that: replacing hard petroleum asphalt with AH-70 asphalt; (2) In the third step, the asphalt pipeline is heated to 135 ℃, and the outlet pressure of the colloid mill is atmospheric pressure; and (3) the SBS latex and the rubber powder dispersion liquid are not added.

The AH-70 asphalt and the hard petroleum asphalt are from the same manufacturer, the oil source for producing the asphalt is the same, and the basic physical properties of the AH-70 asphalt are as follows: the penetration degree is 68.1mm, the softening point is 46.5 ℃, and the ductility is more than 100cm at 15 ℃.

Comparative example 7:

the high-viscosity asphalt adopts the following raw materials: 60wt% of SBS modified asphalt, 1.0wt% of double hydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide, 1.5wt% of methyl glucoside polyoxyethylene ether dioleate, 0.5wt% of hydrochloric acid and 37wt% of water.

The preparation method of the high-viscosity asphalt of the comparative example is the same as the steps 1 to 3 of the example 2, and the difference is that (1) SBS modified asphalt is used for replacing hard petroleum asphalt; and (2) the SBS latex and the rubber powder dispersion liquid are not added.

The adopted SBS modified asphalt consists of AH-70 asphalt and SBS, wherein the SBS mixing amount is 4.0wt% of the AH-70 asphalt. The AH-70 bitumen was the same as comparative example 6.

Description of detection:

except for conventional performance indexes such as penetration, softening point, ductility and the like, a rotary viscometer, a Dynamic Shear Rheometer (DSR) and a trabecular bending rheometer (BBR) are adopted to measure the high-temperature performance, the low-temperature performance, the durability and the like of the high-viscosity emulsified asphalt. The viscosity obtained by the rotary viscometer test, the rutting factor G/sin delta measured by DSR and the softening point can be used for representing the high-temperature performance of the asphalt, and the higher the softening point is, the higher the viscosity is, the larger the rutting factor G/sin delta is, and the better the high-temperature anti-rutting performance of the asphalt is. The creep stiffness S and the creep stiffness change rate m obtained by BBR test and ductility (5 ℃) can be used for representing the low-temperature performance of asphalt, and the smaller the S value, the larger the m value, and the larger the ductility (5 ℃), the better the low-temperature performance of asphalt. Strain recovery R and unrecoverable creep compliance J from DSR testing _nr And elastic recovery can be used to characterize the durability of asphalt, the greater R, the greater the elastic recovery, J _nr The smaller the asphalt, the better the durability.

The evaluation of the wheel sticking performance is characterized by mainly testing the length of asphalt remained on the surface of a wheel after the wheel passes through a substrate with different adhesive layer materials on a coating film with a certain length, and calculating to obtain the wheel sticking rate, wherein the larger the wheel sticking rate is, the more serious the wheel sticking of the material is.

The shear strength and the bonding strength are adopted to evaluate the bonding performance of the high-viscosity emulsified asphalt, and the strength test flow is as follows: preparing two same rutting test pieces by using a wheel-milling forming machine, uniformly spreading the emulsified asphalt for experiments on the surface of one rutting test piece according to a set dosage, then placing the other test piece on the surface spread with the asphalt to prepare a rutting-combined test piece, and finally sampling by using a core-picking machine to obtain a strength test piece.

The emulsified asphalt obtained in examples 2 to 8 and comparative examples 1 to 7 was examined by the above-mentioned method, and the examination results are shown in tables 1 and 2.

TABLE 1 Performance index of emulsified asphalt

TABLE 2 Performance index of emulsified asphalt

It should be noted that the SBS modified asphalt emulsified in the comparative example 7 has excellent high and low temperature performance and durability, and is a modified asphalt material which is most applied in the road field, especially high-grade pavement.

As can be seen from the above table, the emulsified asphalt of all the examples has fast demulsification speed and storage stability meeting the requirement that the storage stability of 1d is not more than 1 and the storage stability of 5d specified in technical Specification for construction of asphalt road surfaces for road (JTGF 40-2004), which is the beneficial effect produced by the technical scheme provided by the invention. The comparison shows that the storage stability of the embodiment 1, the comparative example 1 and the comparative example 2 is worse than that of the other embodiments and comparative examples, which indicates that the ideal effect cannot be achieved by using any one of the double hydrogenated tallow methyl benzyl ammonium chloride modified nano-silica and the methyl glucoside polyoxyethylene ether dioleate singly, and the reduction of the mixing amount of the double hydrogenated tallow methyl benzyl ammonium chloride modified nano-silica can also have adverse effect on the storage stability.

As can be seen from the examples and comparative examples, the examples after the addition of SBS and rubber powder are compared with comparative example 5. The penetration, softening point, ductility, viscosity and rutting factor are all obviously improved, the creep stiffness is reduced by s, the creep stiffness change rate m is increased, good high temperature and performance are shown, meanwhile, the elastic recovery rate and the strain recovery rate (R) are increased, the unrecoverable creep compliance is reduced, and good viscoelastic property is shown. Meanwhile, the addition of SBS has obvious advantages in the improvement of low-temperature performance, and the rubber powder has obvious advantages in the improvement of high-temperature performance and viscoelasticity.

In addition, it can be seen that the tack index of the examples of the present invention is significantly reduced and the shear strength and the adhesive strength are significantly improved compared to AH-70 base asphalt and SBS modified asphalt. And the rubber powder has more obvious advantages in the aspect of reducing the wheel sticking rate.

In conclusion, the high-temperature performance and the viscoelasticity performance of the high-viscosity emulsified asphalt prepared by the embodiment of the invention are higher than those of the common SBS modified asphalt, the low-temperature performance is equivalent to that of the common SBS modified asphalt, and the high-temperature performance and the viscoelasticity performance meet the specification requirements; however, the performance, the shear strength and the bonding strength of the wheel sticking are all superior to those of SBS modified asphalt. In addition, the rubber powder used in this example is lower in cost than the base asphalt, the hard asphalt and the SBS, and thus the high-viscosity asphalt of this example is lower in overall cost than the SBS-modified asphalt.

Example 9:

1. preparation of high-viscosity emulsified asphalt

A highly viscous emulsified asphalt prepared by the method described in example 3.

2. Preparation of embedded warm-mix asphalt mixture

Preparation of warm-mixed high-viscosity modified asphalt

The warm-mixed high-viscosity modified asphalt used in the example is obtained by mixing AH-70 asphalt, a high-viscosity asphalt modifier, a sulfur stabilizer, extract oil and a warm-mixing agent.

The mass percentages of the raw materials are respectively as follows:

wherein:

the high-viscosity asphalt modifier is prepared from 10 mass percent of C9 petroleum resin, 6 mass percent of SBS (polystyrene-polybutadiene block copolymer), 80 mass percent of rubber powder, 2 mass percent of solid rosin and 2 mass percent of talcum powder. Adding raw materials such as C9 petroleum resin particles, granular SBS modifier, powdery solid rosin, rubber powder particles, talcum powder and the like into a grinder for grinding, and premixing uniformly to obtain mixed solid powder. And (3) injecting the mixed solid powder into a preheated (180 ℃) double-screw extruder, cooling the extruded strip-shaped mixture in a cold water area, and cutting and screening the mixture by a granulator to form a finished product of the granular high-viscosity asphalt modifier.

The warm-mixing agent is palmitic acid imidazoline warm-mixing agent, is prepared by amidation and cyclization of palmitic acid and tetraethylenepentamine, reaction raw materials of palmitoleic acid and tetraethylenepentamine are added into a three-opening glass flask according to the mass ratio of 1.2, a certain amount of dimethylbenzene is added as a water carrying agent (30% of the total mass of palmitoleic acid and tetraethylenepentamine), the temperature is gradually increased under magnetic stirring for reflux, and the reaction is carried out for 6 hours at the reaction temperature of 150 ℃. In the process, the carboxylic acid group in the palmitoleic acid and the amine group in the tetraethylenepentamine are subjected to amidation reaction. After the reaction is finished, the redundant dimethylbenzene is steamed out, then the flask is vacuumized until the vacuum degree is 0.096MPa, and the temperature is raised to 260 ℃ under stirring for cyclization reaction for 4 hours, so that a warm-mixing agent crude product is prepared. And rotationally evaporating the crude product at 60 ℃ for 1h to remove water and solvent, carrying out tertiary recrystallization by using acetone, and carrying out vacuum drying for 12h to obtain the palmitic acid imidazoline warm mixing agent product.

The technical properties of the obtained warm-mix high-viscosity asphalt are shown in Table 3.

TABLE 3 Performance index of warm mix high viscosity asphalt

Performance index	Example 2
		Penetration/0.1 mm	36
Softening point/. Degree.C	81.2
		Ductility (5 ℃) per cm	21.3
Viscosity (60 ℃ C.)/pas	34382
		Viscosity (135 ℃ C.)/pas	6.928
Elastic recovery rate/%)	94.6

Preparation of (II) embedded warm-mix high-viscosity modified asphalt mixture

1. The composition of the embedded solid type warm mix high viscosity modified asphalt mixture of this example is shown in Table 4.

TABLE 4 composition of the mixes

The filler consists of 99 percent of limestone mineral powder and 1 percent of slaked lime.

The mineral aggregate gradation of the embedded modified asphalt mixture prepared according to the composition ratios shown in Table 4 is shown in Table 5.

TABLE 5 mineral aggregate gradation of embedded modified asphalt mixture

2. The preparation method of the embedded warm-mix high-viscosity modified asphalt mixture comprises the following steps:

weighing fine aggregate, 5mm-7mm short untwisted polymeric fiber and coarse aggregate according to the proportion shown in the table 4, mixing for 15s, adding warm-mixed high-viscosity modified asphalt, mixing for 20s, and finally adding filler, and mixing for 20s to obtain the embedded asphalt mixture. The mixture is compacted under the conditions that the unit pressure is 600KPa, the rotation angle is 1.25 degrees, the rotation speed is 30r/min and the set number of times of rotary compaction is 100, and a volume index test is carried out, wherein the volume index of the compacted asphalt mixture is shown in table 6.

TABLE 6 volume index of embedded asphalt mixture

Volume index	Unit of	The result of the detection
			Void fraction (VV)	％	3.8
Mineral aggregate void fraction (VMA)	％	18.9
			Asphalt saturation (VFA)	％	79.7
Thickness of oil film	μm	10.6

3. Road performance:

firstly, preparing the embedded solid type warm-mixing high-viscosity modified asphalt mixture according to the composition proportion shown in the table 4, forming a test piece, and testing various pavement performance indexes of the test piece, wherein the test result is shown in the table 7.

TABLE 7 road performance index test results of the embedded warm-mix high-viscosity modified asphalt mixture

Detecting items	Unit of	The result of the detection
			Binder loss for asphalt leakage test	％	0.03
Stability of immersed Marshall residue	％	92.4
			Freeze-thaw split strength ratio	％	90.4
Dynamic stability of rut test	Sub/mm	8860
			Low temperature bending failure strain	με	3380
Depth of construction	mm	0.87
			Coefficient of pendulum friction	/	73.3

(II) adhesive power

At a rate of 0.6kg/m ² The high-viscosity emulsified asphalt is used as a layer-bonding oil, an embedded and fixed type warm-mixed high-viscosity modified asphalt mixture shown in a table 3 is additionally paved on an AC-13 type original pavement, the interlaminar shear strength at 25 ℃ measured by an oblique shear test (45 ℃) is 2.83MPa, and the interlaminar bond strength at 25 ℃ measured by a drawing test is 1.62MPa.

For comparison, the high-viscosity emulsified asphalt is respectively changed into common emulsified asphalt and SBR latex modified emulsified asphalt to be used as bonding layer oil, an embedded type warm-mixing high-viscosity modified asphalt mixture shown in a table 2 with the thickness of 2.5cm is additionally paved on an AC-13 type original pavement, the interlayer shear strength at 25 ℃ measured by adopting an oblique shear test (45 ℃) is respectively 2.35MPa and 2.10MPa, and the interlayer bonding strength at 25 ℃ measured by adopting a drawing test is respectively 0.53MPa and 0.45MPa.

The high-viscosity emulsified asphalt and the embedded warm-mixing high-viscosity modified asphalt mixture are used together, and compared with the traditional emulsified asphalt, the high-viscosity emulsified asphalt has higher shear strength and bonding strength.

Example 10:

1. preparation of high-viscosity emulsified asphalt

A highly viscous emulsified asphalt prepared by the method described in example 6.

2. Preparation of embedded warm-mix asphalt mixture

Preparation of warm-mixed high-viscosity modified asphalt

The raw materials and preparation method of the warm-mixed high-viscosity modified asphalt are the same as those in example 9.

Preparation of (II) embedded warm-mix high-viscosity modified asphalt mixture

1. The composition of the embedded solid type warm mix high viscosity modified asphalt mixture of this example is shown in Table 8.

TABLE 8 composition of the mixes

The filler consists of 99% of limestone mineral powder and 1% of slaked lime.

The mineral aggregate gradation of the embedded modified asphalt mixture prepared according to the composition ratios shown in Table 8 is shown in Table 9.

TABLE 9 mineral aggregate gradation of embedded modified asphalt mixture

weighing fine aggregate, 5mm-7mm short untwisted polymeric fiber and coarse aggregate according to the proportion shown in the table 8, mixing for 15s, adding warm-mixed high-viscosity modified asphalt, mixing for 20s, and finally adding filler, and mixing for 20s to obtain the embedded asphalt mixture. The obtained mixture is compacted under the conditions that the unit pressure is 600Kpa, the rotation angle is 1.25 degrees, the rotation speed is 30r/min and the set number of times of rotary compaction is 100 times, and a volume index test is carried out, wherein the volume index of the compacted asphalt mixture is shown in a table 10.

TABLE 10 volume index of embedded warm-mix high-viscosity modified asphalt mixture

Volume index	Unit of	The result of the detection
			Void fraction (VV)	％	4.1
Mineral aggregate void fraction (VMA)	％	22.3
			Asphalt saturation (VFA)	％	81.6
Thickness of oil film	μm	10.9

3. Road performance:

firstly, preparing the embedded solid type warm-mixing high-viscosity modified asphalt mixture according to the composition proportion shown in the table 8, forming a test piece, and testing various pavement performance indexes of the test piece, wherein the test result is shown in the table 11.

TABLE 11 road performance index test results for the embedded warm mix high viscosity modified asphalt mixture

Detecting items	Unit of	The result of the detection
			Binder loss for asphalt leakage test	％	0.01
Stability of immersed Marshall residue	％	93
			Freeze-thaw split strength ratio	％	92.5
Dynamic stability of rut test	Sub/mm	8900
			Low temperature bending failure strain	με	3250
Depth of construction	mm	0.89
			Coefficient of pendulum friction	/	74.2

(II) adhesive power

At a rate of 0.6kg/m ² The high-viscosity emulsified asphalt is used as a layer-adhering oil, an embedded warm-mixed high-viscosity modified asphalt mixture with the thickness of 2.5cm and shown in a table 8 is additionally paved on an AC-13 type original pavement, the interlaminar shear strength at 25 ℃ measured by an oblique shear test (45 ℃) is 2.57MPa, and the interlaminar bond strength at 25 ℃ measured by a drawing test is 1.54MPa.

The above-described embodiments are merely preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.

Claims

1. The method for paving the ultrathin wearing layer based on the high-viscosity emulsified asphalt is characterized by comprising the following steps of:

50 to 70 weight percent of hard petroleum asphalt,

1 to 5 weight percent of SBS latex,

1 to 15 weight percent of rubber powder dispersion liquid,

0.1-2.0 wt% of bihydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide,

0.1 to 2.0 weight percent of methyl glucoside polyoxyethylene ether dioleate,

0.1 to 1.5 percent of hydrochloric acid,

the balance of water;

the preparation method comprises the following steps:

s11, adding the dihydrogenated tallow methyl benzyl ammonium chloride modified nano-silica and methyl glucoside polyoxyethylene ether dioleate into a hydrochloric acid aqueous solution at the temperature of 80-90 ℃ to obtain a soap solution with the pH value of 1-3, and then cooling to 50-60 ℃ in a natural state for later use;

s12, heating the hard petroleum asphalt to 155-170 ℃ for later use;

s13, feeding the soap solution and the hard petroleum asphalt to a colloid mill, grinding by the colloid mill, and performing heat exchange and cooling to obtain hard emulsified asphalt;

s14, mixing and stirring SBS latex, rubber powder dispersion liquid and hard emulsified asphalt to obtain pre-dispersed emulsion; grinding the pre-dispersed emulsion by a colloid mill to obtain high-viscosity emulsified asphalt;

the preparation method of the double hydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide comprises the following steps:

mixing the solution a and the suspension b according to the mass ratio of 1 (0.8-1.2), reacting at 75-90 ℃ for 12-36 hours, removing water after the reaction is finished, and drying and activating in vacuum for 8-16 hours to obtain the double-hydrogenated tallow methyl benzyl ammonium chloride modified nano silicon dioxide;

s2, paving and compacting the embedded warm-mixed asphalt mixture.

2. The method for paving the ultrathin wearing layer based on the high-viscosity emulsified asphalt as claimed in claim 1, wherein the method comprises the following steps: the rubber powder dispersion liquid consists of rubber powder, a suspending agent, a dispersing agent and water, wherein the mass ratio of the rubber powder to the suspending agent to the dispersing agent to the water is 10 (0.5-1.5) to (1-3), and the mass percentage of the rubber powder is not less than 70%.

3. The method for paving the ultrathin wearing layer based on the high-viscosity emulsified asphalt as claimed in claim 1, wherein the method comprises the following steps: step S13 includes:

s131, preheating a colloid mill grinding head, an asphalt pipeline and a soap liquid pipeline;

s132, improving the outlet pressure of the asphalt pipeline, the soap solution pipeline and the colloid mill, wherein the outlet pressure of the colloid mill is adjusted to 0.15-0.25MPa.

4. The method for paving the ultrathin wearing layer based on the high-viscosity emulsified asphalt as claimed in claim 1, wherein the method comprises the following steps: the embedded solid type warm mix asphalt mixture is formed by mixing 5.5-8.5% of warm mix high-viscosity modified asphalt, 0.l-0.5% of 5mm-7mm short-cut untwisted polyester fiber, 70-75% of coarse aggregate, 15-20% of fine aggregate and 6-12% of filler in percentage by mass.

5. The method for paving the ultrathin wearing layer based on the high-viscosity emulsified asphalt as claimed in claim 4, wherein the method comprises the following steps: the warm-mixed high-viscosity modified asphalt is prepared by mixing 80-90% of AH-70 asphalt, 10-16% of high-viscosity asphalt modifier, 0.02-0.04% of stabilizer, 0.4-0.8% of compatilizer and 0.4-1.0% of warm-mixing agent in percentage by mass,

the high-viscosity asphalt modifier consists of C ₉ Petroleum resin, polystyrene-polybutadiene block copolymer SBS, rubber powder, solid rosin and talcum powder;

the stabilizer is a sulfur stabilizer;

the compatilizer is extract oil;

the warm mixing agent is imidazoline palmitate warm mixing agent.

6. The method for paving the ultrathin wearing layer based on the high-viscosity emulsified asphalt as claimed in claim 4, wherein the method comprises the following steps: the coarse aggregate is basalt or/and diabase macadam with nominal maximum grain size of 9.5mm and 4.75mm sieve mesh passing rate of less than 5%, wherein the content of the macadam with grain size of 6.7mm-9.5mm is more than 65%;

the fine aggregate is machine-made sand or stone chips processed by alkaline or neutral stone with the 2.36mm sieve-hole passing rate of more than 95 percent and the 0.075mm sieve-hole passing rate of less than 8 percent;

the filler comprises limestone mineral powder and slaked lime or cement with the content of less than 2 percent.

7. The method for paving the ultrathin wearing layer based on the high-viscosity emulsified asphalt as claimed in claim 4, wherein the method comprises the following steps: the method comprises the following construction steps:

s1, cleaning an original pavement and treating diseases;

s2, spreading 0.3L/m on the original road surface under the condition that the temperature of the road surface is not lower than 5 DEG C ² -1.2 L/m ² The high-viscosity emulsified asphalt bonding layer;

s3, paving a layer of embedded warm-mixed high-viscosity modified asphalt mixture with the thickness of 1.6-3.0 cm on the bonding layer, wherein the paving temperature is 115-155 ℃;