CN111253763A - Dispersed SBS modified asphalt mixture regenerant and preparation method thereof - Google Patents
Dispersed SBS modified asphalt mixture regenerant and preparation method thereof Download PDFInfo
- Publication number
- CN111253763A CN111253763A CN202010226693.1A CN202010226693A CN111253763A CN 111253763 A CN111253763 A CN 111253763A CN 202010226693 A CN202010226693 A CN 202010226693A CN 111253763 A CN111253763 A CN 111253763A
- Authority
- CN
- China
- Prior art keywords
- asphalt mixture
- modified asphalt
- sbs modified
- regenerant
- tall oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Road Paving Structures (AREA)
Abstract
The invention relates to a dispersing SBS modified asphalt mixture regenerant and a preparation method thereof. Specifically, the weight ratio of the crude tall oil-based surfactant to the modified cardanol surfactant to the plasticizer is (50-80): (10-45): (5-10). The regenerant can promote the effective fusion of the aged SBS modified asphalt and the new SBS modified asphalt and can optimize the performance of the prepared regenerated SBS modified asphalt mixture.
Description
Technical Field
The invention relates to the technical field of road building materials, in particular to a dispersed SBS modified asphalt mixture regenerant and a preparation method thereof.
Background
At present, most of high-grade road and municipal road asphalt pavements in China are maintained or about to enter a reconstruction period, and a large amount of milling asphalt mixture is abandoned, so that on one hand, environmental pollution is caused, and on the other hand, great waste of resources is caused. The regenerated asphalt of waste asphalt mixture (RAP) is well known in the industry, and a mature product and a technical system for regeneration are provided for a common asphalt pavement. There are numerous patent publications relating to bitumen reclaimed products, such as CN1580130, CN101817985A, CN105754358B and CN106497097B, the technical idea of which mostly adopts the addition of light oil, and the differences are only the source of the light oil and other synergistic and modified components.
However, most of our country's high-grade roads and municipal artery asphalt pavements are paved by SBS modified asphalt, the aged SBS modified asphalt has extremely high viscosity, and although the conventional regenerant can play a certain role in reduction under the condition of fully stirring in a laboratory, it is difficult to disperse the aged SBS modified asphalt and fully mix the aged SBS modified asphalt with the aged SBS modified asphalt to play a role in reduction in the mixing process of actual production. Therefore, the aged SBS asphalt mixture can only be used as a common recycled asphalt mixture in most cases, and even the performance of the recycled asphalt mixture is lower than that of the common asphalt mixture.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a dispersing SBS modified asphalt mixture regenerant and a preparation method thereof.
The purpose of the invention is realized by the following technical scheme:
a dispersing SBS modified asphalt mixture regenerating agent is prepared by mixing crude tall oil-based surfactant, modified cardanol surfactant and plasticizer. Specifically, the weight ratio of the crude tall oil-based surfactant to the modified cardanol surfactant to the plasticizer is (50-80): (10-45): (5-10).
Recent studies have shown that the aging of asphalt pavement is caused by the aging of light components (mainly aromatic hydrocarbons) on the one hand, and the agglomeration of asphalt components under long-term vehicle load and climate action is also an important cause of the increase of asphalt modulus and the decrease of deformation performance. In addition, as the high-grade roads and municipal main roads in China mainly adopt SBS modified asphalt, the agglomeration effect is more obvious. The invention adopts the surfactants prepared on the basis of two natural high molecular compounds as main components and certain plasticizing components as auxiliary components, and the action principle is that the crude tall oil-based surfactant and the modified cardanol surfactant have composite action, so that the dispersion of macromolecular micelles of aged asphalt is accelerated in the mixing process of the regenerated asphalt mixture, and the macromolecular micelles are effectively fused with new asphalt, thereby improving the performance of the regenerated asphalt mixture, especially the low temperature resistance and fatigue cracking resistance; rosin substances such as abietic acid in crude tall oil have good compatibility with SBS, and can promote the rapid decomposition of aged SBS; resin acids and oxidized resin acid substances in the crude tall oil have a certain reduction effect on the aged thermoplastic rubber; the addition of the plasticizer DBP or DOP further improves the plasticity of SBS after aging.
The method for preparing the dispersed SBS modified asphalt mixture regenerant comprises the following steps: the method comprises the following steps of (1) mixing a crude tall oil-based surfactant, a modified cardanol surfactant and a plasticizer according to the mass ratio of (50-80) to (10-45): (5-10) placing the mixture into a reaction kettle and stirring to obtain the regenerant. Wherein the temperature for stirring and mixing is 20-30 ℃, the stirring speed is 300-400 r/min, and the stirring time is 20-30 min.
The preparation method of the crude tall oil-based surfactant comprises the following steps:
a1: putting crude tall oil into a reaction kettle, and adding concentrated sulfuric acid while stirring to obtain an intermediate product;
a2: and (3) adding sodium hydroxide into the reaction kettle filled with the intermediate product while stirring until the pH value of the solution is between 8.5 and 9.5, and stopping adding the alkali to obtain the crude tall oil-based surfactant.
Specifically, in the process of preparing the crude tall oil-based surfactant, the molar ratio of the added crude tall oil to concentrated sulfuric acid is 1: 0.1-0.2; the reaction temperature of the step A1 is 35-45 ℃, the stirring speed is 300-500r/min, and the reaction time is 30-60 min; the reaction temperature of the step A2 is 25-30 ℃, and the stirring speed is 200-400 r/min; the content of fatty acid in the added crude tall oil is more than 30 percent, the content of rosin acid is more than 30 percent, the content of unsaponifiable matters is less than 10 percent, and the iodine value is less than 120; the concentration of concentrated sulfuric acid is more than 98 percent.
The preparation method of the modified cardanol surfactant comprises the following steps:
b1: putting cardanol into a reaction kettle, and adding concentrated sulfuric acid while stirring to obtain an intermediate product;
b2: and (3) adding sodium hydroxide into the reaction kettle filled with the intermediate product while stirring until the pH value of the solution is 8.5-9.5, and stopping adding alkali to obtain the modified cardanol surfactant.
Specifically, in the process of preparing the modified cardanol surfactant, the molar ratio of added cardanol to concentrated sulfuric acid is 1: 0.1-0.5; the reaction temperature of the step B1 is 30-45 ℃, the stirring speed is 300-500r/min, and the reaction time is 30-60 min; the reaction temperature of the step B2 is 25-30 ℃, and the stirring speed is 200-400 r/min; the viscosity of the cardanol is 300-600cPa.s, and the concentration of concentrated sulfuric acid is more than 98%.
The plasticizer is dibutyl phthalate (DBP) or dioctyl phthalate (DOP).
A regenerated SBS modified asphalt mixture comprises the dispersed SBS modified asphalt mixture regenerant, and also comprises an aged SBS modified asphalt mixture and a new SBS modified asphalt mixture, wherein the aged SBS modified asphalt mixture comprises: the new SBS modified asphalt mixture (3-4): (7-6), and the weight portion of the dispersed SBS modified asphalt mixture regenerant is 8-10% of that of the old asphalt mixture.
The invention has the following beneficial effects:
1) the crude tall oil fatty acid system surfactant used in the invention has good dispersibility for asphalt micelles, and can rapidly break up macromolecular asphalt micelles aggregated in the long-term use process, so that aged asphalt has better dispersibility in the regeneration process and is fully mixed with new asphalt, and the performance of the regenerated asphalt mixture is further improved;
2) the modified cardanol surfactant can not only play a role in dispersing agglomerated asphalt micelles, but also has a C15 straight chain which is an excellent high polymer material toughening component and can improve the toughness and crack resistance of asphalt;
3) rosin substances such as abietic acid and the like in the crude tall oil have good compatibility with SBS, and after the plasticizer is compounded, the aged SBS can be promoted to be rapidly decomposed, and the plasticity of the aged SBS can be improved;
4) the main components of the crude tall oil and cardanol in the invention are natural plant refined products, and the crude tall oil is a byproduct in the papermaking industry, and has wide source and relatively low price.
Detailed Description
The invention will now be described in further detail with reference to the following examples, in which crude tall oil has an iodine value of 110, a fatty acid content of 47%, a rosin acid content of 44%, and an unsaponifiable content of 8%; concentrated sulfuric acid and sodium hydroxide are both commercial industrial-grade product numbers; the viscosity of cardanol is 450 cPa.s.
Example 1
The embodiment of the invention prepares a dispersed SBS modified asphalt mixture regenerant, which specifically comprises the following steps:
(1) preparation of tall oil-based surfactant: selectively weighing crude tall oil and concentrated sulfuric acid according to a molar ratio of 1:0.15, putting the crude tall oil into a reaction kettle, adding the concentrated sulfuric acid while stirring, wherein the reaction temperature is 40 ℃, the stirring speed is 400r/min, and the reaction time is 45min, so as to obtain an intermediate product; adding sodium hydroxide into a reaction kettle filled with an intermediate product while stirring, wherein the reaction temperature is 30 ℃, the stirring speed is 350r/min, and the addition of alkali is stopped until the pH value of the solution is 9, so as to obtain a crude tall oil-based surfactant;
(2) preparing a modified cardanol surfactant: selecting and weighing cardanol and concentrated sulfuric acid according to a molar ratio of 1:0.3, putting tall oil into a reaction kettle, adding concentrated sulfuric acid while stirring, wherein the reaction temperature is 35 ℃, the stirring speed is 400r/min, and the reaction time is 50min, so as to obtain an intermediate product; adding sodium hydroxide into a reaction kettle filled with an intermediate product while stirring, wherein the reaction temperature is 30 ℃, the stirring speed is 300r/min, and the alkali addition is stopped until the pH value of the solution is between 9, so as to obtain the modified cardanol surfactant;
(3) preparing a regenerant: and (3) putting the tall oil-based surfactant, the modified cardanol surfactant and the plasticizer DBP prepared in the steps (1) and (2) into a reaction kettle according to the mass ratio of 60:34:6, mixing at 25 ℃, stirring at the speed of 350r/min for 30min to obtain the dispersed SBS modified asphalt mixture regenerating agent.
The following is the recycled SBS modified asphalt prepared by using the recycling agent prepared in the example:
the dispersed asphalt regenerant prepared in this example was mixed with aged SBS modified asphalt, the amount of the dispersed asphalt regenerant was selected to be 6%, 8%, 10% of the mass of the aged asphalt, and the properties of the prepared regenerated SBS modified asphalt are shown in table 1:
TABLE 1
Example 2
The embodiment of the invention prepares a dispersed SBS modified asphalt mixture regenerant, which specifically comprises the following steps:
(1) preparation of crude tall oil-based surfactant: selectively weighing crude tall oil and concentrated sulfuric acid according to a molar ratio of 1:0.17, putting the crude tall oil into a reaction kettle, adding the concentrated sulfuric acid while stirring, wherein the reaction temperature is 37 ℃, the stirring speed is 400r/min, and the reaction time is 50min, so as to obtain an intermediate product; adding sodium hydroxide into a reaction kettle filled with an intermediate product while stirring, wherein the reaction temperature is 28 ℃, the stirring speed is 300r/min, and the addition of alkali is stopped until the pH value of the solution is between 9, so as to obtain a crude tall oil-based surfactant;
(2) preparing a modified cardanol surfactant: selecting and weighing cardanol and concentrated sulfuric acid according to a molar ratio of 1:0.25, putting tall oil into a reaction kettle, adding concentrated sulfuric acid while stirring, wherein the reaction temperature is 40 ℃, the stirring speed is 450r/min, and the reaction time is 40min, so as to obtain an intermediate product; adding sodium hydroxide into a reaction kettle filled with an intermediate product while stirring, wherein the reaction temperature is 30 ℃, the stirring speed is 300r/min, and the alkali addition is stopped until the pH value of the solution is between 9, so as to obtain the modified cardanol surfactant;
(3) preparing a regenerant: and (2) putting the crude tall oil-based surfactant, the modified cardanol surfactant and the plasticizer DOP prepared in the steps (1) and (2) into a reaction kettle according to the mass ratio of 55:37:8, mixing at 30 ℃, stirring at the speed of 300r/min for 28min to obtain the dispersed SBS modified asphalt mixture regenerating agent.
The following is the recycled SBS modified asphalt prepared by using the recycling agent prepared in the example:
the dispersed asphalt regenerant prepared in this example was mixed with aged SBS modified asphalt, the amount of the dispersed asphalt regenerant was selected to be 6%, 8%, 10% of the aged asphalt mass, and the properties of the prepared regenerated SBS modified asphalt are shown in table 2:
TABLE 2
Comparative example 1
In the comparative example, a certain light oil asphalt regenerant sold in the market is selected, and the recommended mixing amount of the light oil asphalt regenerant is 8-10% of that of the aged asphalt. In the comparative example, the mixing amount of the light oil asphalt regenerant is selected from a median value recommended by a manufacturer, namely 9% of the mass of the aged asphalt, and the properties of the prepared regenerated asphalt mixture are shown in a table 3:
TABLE 3
Comparative analysis 1
Table 4 is a comparative table of the results of the performance tests of the recycled SBS modified asphalt prepared in examples 1-2 and comparative example 1:
TABLE 4
The results show that the penetration degree and ductility of the aged SBS modified asphalt are obviously reduced, and the softening point is obviously improved. After the regenerant of the comparative example is added, the performance of the asphalt can be partially improved due to the supplement of the light component, but the requirement of SBS modified asphalt is still difficult to meet, which indicates that the general asphalt regenerant has poor adaptability to SBS modified asphalt. However, because the regenerant prepared by the invention mainly aims at the dispersion of the aged asphalt and the effective mixing of the aged asphalt and the new asphalt, the performance of the aged asphalt is not obviously reduced by simply adding the regenerant into the aged asphalt, and the performance of the aged asphalt does not change greatly along with the addition amount.
Example 3
In this embodiment, the dispersant SBS modified asphalt mixture regenerant prepared in example 1 is used as a regenerant for preparing a regenerated asphalt mixture, and in addition, an aged SBS modified asphalt mixture and a new SBS modified asphalt mixture are selected, the gradation of the aged SBS modified asphalt mixture is AC-13C, the blending ratio of the aged asphalt mixture to the new asphalt mixture is 3:7 and 4:6, the blending amount of the regenerant is selected to be 8%, 9%, 10% of the mass of the aged asphalt in the mixture, and the properties of the prepared regenerated SBS modified asphalt mixture are as shown in table 5:
TABLE 5
Example 4
In this embodiment, the dispersant SBS modified asphalt mixture regenerant prepared in example 2 is used as a regenerant for preparing a regenerated asphalt mixture, and in addition, an aged SBS modified asphalt mixture and a new SBS modified asphalt mixture are selected, the gradation of the aged SBS modified asphalt mixture is AC-13C, the blending ratio of the aged asphalt mixture to the new asphalt mixture is 3:7 and 4:6, the blending amount of the regenerant is selected to be 8%, 9%, 10% of the mass of the aged asphalt in the mixture, and the properties of the prepared regenerated SBS modified asphalt mixture are as shown in table 6:
TABLE 6
Comparative example 2
In the comparative example, the light oil asphalt recycling agent selected in the comparative example 1 is adopted, in addition, an aged SBS modified asphalt mixture and a new SBS modified asphalt mixture are also selected, the gradation of the aged SBS modified asphalt mixture is AC-13C, the mixing ratio of the aged SBS modified asphalt mixture to the new SBS modified asphalt mixture is 3:7 and 4:6, the mixing amount of the light oil asphalt recycling agent is 9% of the mass of the aged asphalt in the mixture, and the properties of the prepared regenerated SBS modified asphalt mixture are shown in the following table 7:
TABLE 7
Comparative analysis 2
Table 8 is a comparative table of the results of the performance tests of the recycled SBS modified asphalt prepared in examples 3-4 and comparative example 2:
TABLE 8
As can be seen from table 8, in examples 3 to 4, the properties of the prepared recycled SBS-modified asphalt mixture are significantly improved, wherein the low-temperature strain and water stability (freeze-thaw split strength ratio) are particularly significantly improved, and the requirements of specifications for the new SBS-modified asphalt mixture can be met, and the requirements are greatly exceeded, while the high-temperature properties are not significantly reduced compared to those before the blending of the recycling agent. With the increase of the mixing amount, the dispersion of the aged SBS modified asphalt and the fusion with the new SBS modified asphalt are better, and the low-temperature cracking resistance of the asphalt is improved more obviously.
In contrast to comparative example 2, although the reduction capability of the aged SBS modified asphalt is strong, the asphalt mixture in comparative example 2 has significantly lower performance than the examples because of the doubtful fact whether the asphalt mixture can be uniformly and thoroughly dispersed during the mixing process of the asphalt mixture.
In addition, along with the increase of the mixing amount of the old materials, the performance of the mixture in the embodiment 3-4 is not changed greatly, and the high-temperature performance is also improved due to the increase of the proportion of the aged SBS modified asphalt; however, in comparative example 2, the performance is significantly reduced when the amount of the used material is increased. Therefore, the invention has obvious effect on the dispersion of the aged SBS modified asphalt micelle and is suitable for the regenerated SBS modified asphalt mixture with high-content old materials.
The above description is only a preferred embodiment of the present invention, but not intended to limit the scope of the invention, and all simple equivalent changes and modifications made in the claims and the description of the invention are within the scope of the invention.
Claims (10)
1. A dispersing SBS modified asphalt mixture regenerant is characterized in that: the modified cardanol modified tall oil base surfactant is prepared by mixing crude tall oil base surfactant, modified cardanol surfactant and plasticizer.
2. The dispersed SBS modified asphalt mixture regenerating agent as claimed in claim 1, wherein: the weight ratio of the crude tall oil-based surfactant to the modified cardanol surfactant to the plasticizer is (50-80): 10-45): (5-10).
3. A method for preparing the dispersed SBS modified asphalt mixture reactivator of claim 1, comprising the steps of: the method comprises the following steps of (1) mixing a crude tall oil-based surfactant, a modified cardanol surfactant and a plasticizer according to the mass ratio of (50-80) to (10-45): (5-10) placing the mixture into a reaction kettle and stirring to obtain the regenerant.
4. The method for preparing the dispersed SBS modified asphalt mixture regenerant as claimed in claim 3, wherein the method comprises the following steps: wherein the temperature for stirring and mixing is 20-30 ℃, the stirring speed is 300-400 r/min, and the stirring time is 20-30 min.
5. The method for preparing the dispersed SBS modified asphalt mixture regenerant as claimed in claim 3, wherein the method comprises the following steps: wherein the preparation method of the crude tall oil-based surfactant comprises the following steps:
a1: putting crude tall oil into a reaction kettle, and adding concentrated sulfuric acid while stirring to obtain an intermediate product;
a2: and (3) adding sodium hydroxide into the reaction kettle filled with the intermediate product while stirring until the pH value of the solution is between 8.5 and 9.5, and stopping adding the alkali to obtain the crude tall oil-based surfactant.
6. The method for preparing the dispersed SBS modified asphalt mixture regenerant as claimed in claim 5, wherein the method comprises the following steps: in the process of preparing the crude tall oil-based surfactant, the molar ratio of the added crude tall oil to concentrated sulfuric acid is 1: 0.1-0.2; the reaction temperature of the step A1 is 35-45 ℃, the stirring speed is 300-500r/min, and the reaction time is 30-60 min; the reaction temperature of the step A2 is 25-30 ℃, and the stirring speed is 200-400 r/min; the content of fatty acid in the added crude tall oil is more than 30 percent, the content of rosin acid is more than 30 percent, the content of unsaponifiable matters is less than 10 percent, and the iodine value is less than 120; the concentration of concentrated sulfuric acid is more than 98 percent.
7. The method for preparing the dispersed SBS modified asphalt mixture regenerant as claimed in claim 3, wherein the preparation method of the modified cardanol surfactant comprises the following steps:
b1: putting cardanol into a reaction kettle, and adding concentrated sulfuric acid while stirring to obtain an intermediate product;
b2: and (3) adding sodium hydroxide into the reaction kettle filled with the intermediate product while stirring until the pH value of the solution is 8.5-9.5, and stopping adding alkali to obtain the modified cardanol surfactant.
8. The method for preparing the dispersed SBS modified asphalt mixture regenerating agent according to claim 7, wherein the method comprises the following steps: in the process of preparing the modified cardanol surfactant, the molar ratio of added cardanol to concentrated sulfuric acid is 1: 0.1-0.5; the reaction temperature of the step B1 is 30-45 ℃, the stirring speed is 300-500r/min, and the reaction time is 30-60 min; the reaction temperature of the step B2 is 25-30 ℃, and the stirring speed is 200-400 r/min; the viscosity of the cardanol is 300-600cPa.s, and the concentration of concentrated sulfuric acid is more than 98%.
9. The method for preparing the dispersed SBS modified asphalt mixture regenerant as claimed in claim 3, wherein the method comprises the following steps: the plasticizer is dibutyl phthalate (DBP) or dioctyl phthalate (DOP).
10. The regenerated SBS modified asphalt mixture is characterized in that: the dispersed SBS modified asphalt mixture regenerant of claim 1, further comprising an aged SBS modified asphalt mixture and a new SBS modified asphalt mixture, wherein the aged SBS modified asphalt mixture is: the new SBS modified asphalt mixture (3-4): (7-6), and the weight portion of the dispersed SBS modified asphalt mixture regenerant is 8-10% of that of the old asphalt mixture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010226693.1A CN111253763A (en) | 2020-03-27 | 2020-03-27 | Dispersed SBS modified asphalt mixture regenerant and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010226693.1A CN111253763A (en) | 2020-03-27 | 2020-03-27 | Dispersed SBS modified asphalt mixture regenerant and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111253763A true CN111253763A (en) | 2020-06-09 |
Family
ID=70944378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010226693.1A Withdrawn CN111253763A (en) | 2020-03-27 | 2020-03-27 | Dispersed SBS modified asphalt mixture regenerant and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111253763A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112094505A (en) * | 2020-11-04 | 2020-12-18 | 佛山市交通科技有限公司 | SBS modified asphalt regenerant and preparation method thereof |
| CN115286930A (en) * | 2022-08-09 | 2022-11-04 | 广州市市政工程维修处有限公司 | Dispersed SBS modified asphalt mixture regenerant and preparation method thereof |
-
2020
- 2020-03-27 CN CN202010226693.1A patent/CN111253763A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112094505A (en) * | 2020-11-04 | 2020-12-18 | 佛山市交通科技有限公司 | SBS modified asphalt regenerant and preparation method thereof |
| CN112094505B (en) * | 2020-11-04 | 2021-06-11 | 佛山市交通科技有限公司 | SBS modified asphalt regenerant and preparation method thereof |
| CN115286930A (en) * | 2022-08-09 | 2022-11-04 | 广州市市政工程维修处有限公司 | Dispersed SBS modified asphalt mixture regenerant and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104610768B (en) | Asphalt regeneration agent as well as preparation method and application thereof | |
| CN110330800B (en) | Asphalt regenerant and preparation method thereof | |
| CN111253763A (en) | Dispersed SBS modified asphalt mixture regenerant and preparation method thereof | |
| CN107722650A (en) | A kind of environmentally friendly high viscosity modified pitch and preparation method thereof | |
| CN104830076B (en) | A kind of preparation method of scrap rubber cracking conversion modified pitch | |
| CN110922775A (en) | Buton rock asphalt modifier based on environment-friendly rubber powder and preparation method and application thereof | |
| CN108841186B (en) | Asphalt regenerant and preparation method and application thereof | |
| WO2012103691A1 (en) | Road asphalt modified by composite modifier and preparation method thereof | |
| CN115160808B (en) | High-viscosity modified asphalt and preparation method thereof | |
| CN102993757B (en) | Preparation method of stable composite modified asphalt | |
| CN112029300A (en) | Low-dosage asphalt regenerant and preparation and application methods thereof | |
| CN114716839B (en) | Modified asphalt for heavy-duty pavement, modified asphalt mixture and preparation method thereof | |
| CN104530414B (en) | Preparation and application of silica white dispersing agent for rubber products | |
| CN110903662A (en) | Regenerated asphalt and preparation method thereof | |
| CN113025065B (en) | Emulsifying regenerant with construction workability and preparation method thereof | |
| CN113861708A (en) | High-viscosity high-elasticity modified asphalt and preparation method thereof | |
| CN111349269A (en) | Dispersing type asphalt regenerant and preparation method thereof | |
| CN101629021A (en) | High-quality pavement petroleum asphalt material and preparation method thereof | |
| CN110467825B (en) | Warm-mixed asphalt mixture containing reclaimed materials and preparation method thereof | |
| CN109294256A (en) | A kind of rubber powder modified asphalt of highly anti-fatigue cracking resistance | |
| CN114015244A (en) | High-performance rubber asphalt and preparation method thereof | |
| CN111500000A (en) | Preparation method of rubber softener | |
| CN112111165A (en) | Asphalt regenerant and preparation method and application thereof | |
| CN109867971A (en) | A kind of compound suppression fumed oak glue asphalt production process of expanded graphite coumarone indene resin | |
| CN107779217B (en) | Emulsified asphalt prepared from coal liquefaction residues and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200609 |
|
| WW01 | Invention patent application withdrawn after publication |