Basalt fiber composite modified asphalt based on Xinjiang asphalt and preparation method thereof

Abstract

The invention discloses basalt fiber composite modified asphalt based on Xinjiang asphalt and a preparation method, and belongs to the field of road building materials, and the basalt fiber composite modified asphalt is prepared from the following components in parts by mass: 100 parts of Xinjiang asphalt, 4 parts of SBS modifier, 4 parts of chopped basalt fiber, 6 parts of aryl filling oil, 2 parts of compatilizer and 0.5 part of stabilizer. The preparation method specifically comprises the following steps: step 1, preparing materials; step 2, asphalt blending; step 3, preparing modified asphalt; and 4, developing the modified asphalt. The Xinjiang asphalt subjected to compound modification has the obvious advantages of excellent high-temperature and low-temperature performance, convenience in construction and the like.

Description

Technical Field

[0001] The invention relates to the field of road construction materials, in particular to basalt fiber composite modified asphalt based on Xinjiang asphalt and a preparation method thereof. Background Art

[0002] "Study on the Performance of Composite Modified Asphalt of SBS and SBR Rubber Powder" found that Karamay asphalt has the characteristics of low asphaltene and low aromatic content, resulting in poor modification effect of SBS. The low aromatic content of Xinjiang asphalt makes the SBS modifier insufficiently swollen, which is easy to produce agglomeration, causing modification problems. To overcome the problem of poor compatibility of the Karamay asphalt-SBS system, it is necessary to adjust the asphalt components, increase its aromatic content, and add stabilizers that can chemically cross-link the system. Publication No. CN115093873A, a preparation method for modified Karamay asphalt and its emulsification method, uses a single Karamay asphalt without changing its low aromatic content, and still has the defect of insufficient high temperature performance. Publication No. CN106280503A, a basalt fiber asphalt and its preparation method, only adds basalt fiber physical modification, does not change the components of asphalt from the source, and cannot solve the phenomenon of agglomeration of modified asphalt. Summary of the invention

[0003] In view of the problems existing in the prior art, the present invention provides a basalt fiber composite modified asphalt based on Xinjiang asphalt and a preparation method thereof. In view of the shortcomings and deficiencies of asphalt produced in the above-mentioned Xinjiang region, the Xinjiang asphalt after composite modification has excellent high and low temperature performance and has obvious advantages such as convenient construction.

[0004] The present invention is achieved through the following technical solutions:

[0005] In the first aspect, the present application provides a basalt fiber composite modified asphalt based on Xinjiang asphalt, which includes, by mass, 100 parts of Xinjiang asphalt, 4-5 parts of SBS modifier, 2-6 parts of basalt fiber, 4-8 parts of aromatic filler oil, 2 parts of compatibilizer and 0.5 parts of stabilizer.

[0006] Preferably, the Xinjiang asphalt includes Karamay asphalt and Tahe asphalt in a mass ratio of (30%-40%): (70%-60%).

[0007] Preferably, the SBS modifier is a star-shaped styrene-butadiene-styrene triblock copolymer with a block ratio of 3:7, non-oil-extended, and a molecular weight of 230,000-280,000.

[0008] Preferably, the basalt fiber has a diameter of 5-45 μm and a length of 6-18 mm.

[0009] Preferably, the aromatic-based filler oil comprises, by mass percentage, 70% aromatic hydrocarbons, 25% lubricants, 3% antioxidants and 2% preservatives.

[0010] Preferably, the stabilizer is a sulfur-containing stabilizer.

[0011] In a second aspect, the present application provides a method for preparing basalt fiber composite modified asphalt based on Xinjiang asphalt, comprising:

[0012] Step 1, spray 2 parts of compatibilizer on 4-5 parts of SBS modifier and 2-6 parts of basalt fiber;

[0013] Step 2, using Karamay asphalt and Tahe asphalt to prepare 100 parts of Xinjiang asphalt in a mass ratio of (30%-40%): (70%-60%);

[0014] Step 3, dehydrate the Xinjiang asphalt obtained in step 2 and heat it to a fluid state, add 4-8 parts of aromatic filler oil and 0.5 parts of stabilizer and mix them evenly to obtain blended Xinjiang asphalt, then add the basalt fiber obtained in step 1 to the blended Xinjiang asphalt and stir them evenly to obtain modified asphalt;

[0015] Step 4: Swelling and developing the modified asphalt obtained in step 3 to obtain SBS / basalt fiber composite modified asphalt based on Xinjiang asphalt.

[0016] Preferably, the preparation method of Xinjiang asphalt in step 2 is as follows:

[0017] The Karamay asphalt and the Tahe asphalt are mixed after being heated to a flowing state, and then the temperature is raised to 150°C±5°C to make the asphalt uniform, and Xinjiang asphalt is obtained after defoaming.

[0018] Preferably, the preparation method of the modified asphalt in step 3 is as follows:

[0019] The temperature of the blended Xinjiang asphalt is gradually raised to 170° C., an SBS modifier and basalt fiber are added to the blended Xinjiang asphalt, and then dispersed stirring and shear stirring are performed in sequence to obtain modified asphalt.

[0020] Preferably, in step 4, the modified asphalt is dried at 180° C. and then swelled and developed to obtain a basalt fiber composite modified asphalt based on Xinjiang asphalt.

[0021] Compared with the prior art, the present invention has the following beneficial technical effects:

[0022] The basalt fiber composite modified asphalt based on Xinjiang asphalt provided by the present invention can effectively improve the physicochemical properties of Xinjiang asphalt by using SBS and basalt fiber composite modified Xinjiang asphalt, and the asphalt is chemically modified by SBS modifier, and the basalt fiber is physically modified by asphalt, and the physical and chemical combination is used. Compared with ordinary matrix asphalt or single modifier modified asphalt, the overall performance is improved. The heat resistance, strength and stability, anti-aging performance, crack resistance, etc. are improved, and the dependence on limited resources is reduced, and the impact on the environment is reduced, and it can be widely used in pavement and road functional layer. In addition, for Xinjiang asphalt with low aromatic points and high saturation points, the SBS modifier is not fully swollen, and agglomeration phenomenon is easily generated, which causes modification problems. Aromatic base filling oil is additionally added therein, so that the aromatic content in the asphalt is increased, and it shows good compatibility with the SBS modifier, which reduces the difficulty of modification.

[0023] Furthermore, the asphalt used is locally produced in Xinjiang and is used after blending, which avoids the poor performance of using a single asphalt, utilizes the locally produced asphalt, reduces transportation and production costs, and promotes the development of the local asphalt industry.

[0024] The preparation method of the present invention adopts Xinjiang Karamay asphalt and Xinjiang Tahe asphalt to prepare Xinjiang blended asphalt, so that the Xinjiang asphalt component first reaches a relatively optimal state, and then according to the characteristics of low aromatic fragrance, aromatic base filler oil is appropriately added to make it fully swell with the SBS modifier, and finally basalt fiber is added to enable the SBS modifier to form a stable network structure, thereby improving the modification effect of the SBS modifier. After the composite modification, the Xinjiang asphalt has excellent high and low temperature performance, and has obvious advantages such as convenient construction.

[0025] Furthermore, the performance of the SBS / basalt fiber composite modified blended asphalt is significantly improved; the lubricant can make the modifier and asphalt mix more evenly during shearing; the antioxidant and preservative can prolong the oxidation time of the modified asphalt and extend the storage life of the modified asphalt. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 The present invention is a flow chart of the preparation method of basalt fiber composite modified asphalt based on Xinjiang asphalt. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0030] For Karamay asphalt SBS modification, a lot of experiments were done on adding secret mixing agents or adjusting the mixing process, which improved the compatibility of asphalt, but the results were either not obvious or other related properties were reduced. Therefore, it is necessary to find a new type of modified material, and basalt fiber, as an inorganic fiber modified material, is used to physically modify Xinjiang asphalt in the form of "reinforcing" asphalt. Basalt fiber is more firmly combined with asphalt, and the two-phase interface can form a stable structural asphalt film to provide it with higher mechanical properties.

[0031] The basalt fiber composite modified asphalt based on Xinjiang asphalt of the present invention can improve the crack resistance, fatigue resistance, rutting resistance and slip resistance of the asphalt pavement, extend the service life of the asphalt pavement, and reduce the maintenance cost of the asphalt pavement. It is an efficient, environmentally friendly and economical asphalt pavement material.

[0032] A basalt fiber composite modified asphalt based on Xinjiang asphalt comprises, by weight, 100 parts of Xinjiang asphalt, 4-5 parts of SBS modifier, 2-6 parts of basalt fiber, 4-8 parts of aromatic-based filling oil, 2 parts of compatibilizer and 0.5 parts of stabilizer.

[0033] Xinjiang asphalt includes Karamay 90# asphalt and Tahe 60# asphalt, with a mass ratio of (30%-40%): (70%-60%).

[0034] SBS modifier is a star-shaped styrene-butadiene-styrene triblock copolymer with a block ratio of 3:7, non-oil-filled, and a molecular weight of 230,000-280,000.

[0035] The basalt fiber has a length of 6-18 mm and a diameter of 5-45 μm.

[0036] Aromatic base filler oil, comprising by mass percentage 70% aromatic hydrocarbons, 25% lubricant, 3% antioxidant and 2% preservative.

[0037] The aromatic hydrocarbon is benzene, toluene, xylene or ethylbenzene; the lubricant is silane or polysiloxane; the antioxidant is DBPC or BHT; and the preservative is an organic acid.

[0038] The stabilizer is a sulfur-containing stabilizer, and the content of effective substances is ≥80%.

[0039] A method for preparing basalt fiber composite modified asphalt based on Xinjiang asphalt, comprising the following steps:

[0040] Step 1, spray 2 parts of compatibilizer on 4-5 parts of SBS modifier and 2-6 parts of basalt fiber;

[0041] Step 2, using Karamay 90# asphalt and Tahe 60# asphalt to prepare 100 parts of Xinjiang asphalt according to the mass ratio of (30%-40%): (70%-60%);

[0042] Step 3, dehydrate the Xinjiang asphalt obtained in step 2 and heat it to a fluid state, add 4-8 parts of aromatic filler oil and 0.5 parts of stabilizer and mix them evenly, then add the basalt fiber obtained in step 1 and stir evenly to obtain modified asphalt;

[0043] Step 4: Swelling and developing the modified asphalt obtained in step 3 to obtain SBS / basalt fiber composite modified asphalt based on Xinjiang asphalt.

[0044] Example 1

[0045] This embodiment provides a basalt fiber composite modified asphalt based on Xinjiang asphalt, which includes, by weight, 100 parts of Xinjiang asphalt, 4 parts of SBS modifier, 2 parts of chopped basalt fiber, 4 parts of aromatic-based filling oil, 2 parts of compatibilizer, and 0.5 parts of stabilizer.

[0046] Xinjiang asphalt is a blend of Karamay 90# asphalt and Tahe 60# asphalt. The mass ratio of Karamay 90# asphalt to Tahe 60# asphalt is 2:3.

[0047] The basalt fibers were chopped into short strands with a length of 6 mm and a diameter of 13 μm.

[0048] Aromatic filler oil includes 70% aromatic hydrocarbons (such as benzene, toluene, xylene and ethylbenzene), 25% lubricants (silanes and polymerized siloxanes), 3% antioxidants (such as DBPC or BHT) and 2% preservatives (organic acids, etc.).

[0049] The preparation method of the basalt fiber composite modified asphalt based on Xinjiang asphalt specifically comprises the following steps:

[0050] Step 1, material preparation:

[0051] The SBS modifier is dried in advance and prepared, the chopped basalt fibers are washed and dried with clean water, 4 parts of the SBS modifier and 2 parts of the chopped basalt fibers are weighed respectively and sprayed with a compatibilizer;

[0052] Step 2, asphalt blending:

[0053] Heat Karamay 90# asphalt and Tahe 60# asphalt at 135°C until flowing, and take out the asphalt; add the two kinds of asphalt in a weight ratio of 2:3, and stir while heating to 145°C; stir the asphalt that has reached the set temperature at a speed of 1500rad / min for 60 minutes, let it stand for 30 minutes, and obtain Xinjiang asphalt after defoaming;

[0054] Step 3, preparation of modified asphalt:

[0055] Heat 100 parts of Xinjiang asphalt to 160°C to dehydrate, add 4 parts of aromatic filler oil and 0.5 parts of stabilizer when the Xinjiang asphalt reaches a flowable state, and then stir for 10 minutes;

[0056] When the temperature of Xinjiang asphalt gradually rises to 170°C, the SBS modifier and chopped basalt fiber in step 1 are added to the blended Xinjiang asphalt. The asphalt is first stirred for 30 minutes at 170°C and a rotation speed of 800 rad / min using a low-speed mixer to disperse the additives in the asphalt. Then, the asphalt mortar is sheared for 30 minutes at 170°C and a rotation speed of 4000 rad / min using a high-shear mixing emulsifier to ensure that the additives are evenly dispersed in the asphalt.

[0057] Step 4, modified asphalt development:

[0058] After the modified asphalt was sheared, it was treated in an oven at 180°C for 30 minutes and then swelled and developed again to obtain SBS / basalt fiber composite modified asphalt based on Xinjiang asphalt.

[0059] The performance test results of the Xinjiang asphalt-based basalt fiber composite modified asphalt prepared in this example are shown in Table 2.

[0060] Example 2

[0061] This embodiment provides a basalt fiber composite modified asphalt based on Xinjiang asphalt, which includes, by weight, 100 parts of Xinjiang asphalt, 4 parts of SBS modifier, 4 parts of chopped basalt fibers, 8 parts of aromatic-based filling oil, 2 parts of compatibilizer, and 0.5 parts of stabilizer.

[0062] The preparation method of the SBS / basalt fiber composite modified asphalt based on Xinjiang asphalt specifically comprises the following steps:

[0063] Step 1, material preparation:

[0064] The SBS modifier is dried in advance and prepared, the chopped basalt fibers are washed and dried with clean water, 4 parts of the SBS modifier and 4 parts of the chopped basalt fibers are weighed respectively and sprayed with a compatibilizer;

[0065] Step 2, asphalt blending:

[0066] Heat Karamay 90# asphalt and Tahe 60# asphalt at 135°C until flowing, and take out the asphalt; add the two kinds of asphalt in a weight ratio of 2:3, and stir while heating to 155°C; stir the asphalt that has reached the set temperature at a speed of 1000rad / min for 60 minutes, let it stand for 30 minutes, and obtain Xinjiang asphalt after defoaming;

[0067] Step 3, preparation of modified asphalt:

[0068] Heat 100 parts of Xinjiang asphalt to 165°C to dehydrate, add 8 parts of aromatic filler oil and 0.5 parts of stabilizer when the Xinjiang asphalt reaches a flowable state, and then stir for 10 minutes;

[0069] When the temperature of Xinjiang asphalt gradually rises to 170°C, the SBS modifier and chopped basalt fiber in step 1 are added to the blended Xinjiang asphalt. The asphalt is first stirred for 30 minutes at 170°C and a rotation speed of 800 rad / min using a low-speed mixer to disperse the additives in the asphalt. Then, the asphalt mortar is sheared for 30 minutes at 170°C and a rotation speed of 4000 rad / min using a high-shear mixing emulsifier to ensure that the additives are evenly dispersed in the asphalt.

[0070] Step 4, modified asphalt development:

[0071] After the modified asphalt was sheared, it was treated in an oven at 180°C for 30 minutes and then swelled and developed again to obtain SBS / basalt fiber composite modified asphalt based on Xinjiang asphalt.

[0072] The performance test results of the Xinjiang asphalt-based basalt fiber composite modified asphalt prepared in this example are shown in Table 2.

[0073] Example 3

[0074] This embodiment provides a basalt fiber composite modified asphalt based on Xinjiang asphalt, which includes, by weight, 100 parts of Xinjiang asphalt, 4 parts of SBS modifier, 6 parts of chopped basalt fibers, 6 parts of aromatic-based filling oil, 2 parts of compatibilizer, and 0.5 parts of stabilizer.

[0075] The preparation method of the basalt fiber composite modified asphalt based on Xinjiang asphalt specifically comprises the following steps:

[0076] Step 1, material preparation:

[0077] The SBS modifier is dried in advance and prepared, the chopped basalt fibers are washed and dried with clean water, 4 parts of the SBS modifier and 6 parts of the chopped basalt fibers are weighed respectively and sprayed with a compatibilizer;

[0078] Step 2, asphalt blending:

[0079] Heat Karamay 90# asphalt and Tahe 60# asphalt at 135°C until flowing, and take out the asphalt; add the two kinds of asphalt in a weight ratio of 2:3, and stir while heating to 150°C; stir the asphalt that has reached the set temperature at a speed of 1200rad / min for 60 minutes, let it stand for 30 minutes, and obtain Xinjiang asphalt after defoaming;

[0080] Step 3, preparation of modified asphalt:

[0081] 100 parts of Xinjiang asphalt were heated to 156°C for dehydration. When the Xinjiang asphalt reached a flowable state, 8 parts of aromatic filler oil and 0.5 parts of stabilizer were added, and then stirred for 10 minutes.

[0082] When the temperature of Xinjiang asphalt gradually rises to 170°C, the SBS modifier and chopped basalt fiber in step 1 are added to the blended Xinjiang asphalt. The asphalt is first stirred for 30 minutes at 170°C and a rotation speed of 800 rad / min using a low-speed mixer to disperse the additives in the asphalt. Then, the asphalt mortar is sheared for 30 minutes at 170°C and a rotation speed of 4000 rad / min using a high-shear mixing emulsifier to ensure that the additives are evenly dispersed in the asphalt.

[0083] Step 4, modified asphalt development:

[0084] After the modified asphalt was sheared, it was treated in an oven at 180°C for 30 minutes and then swelled and developed again to obtain SBS / basalt fiber composite modified asphalt based on Xinjiang asphalt.

[0085] The performance test results of the Xinjiang asphalt-based basalt fiber composite modified asphalt prepared in this example are shown in Table 2.

[0086] Embodiment 4-9

[0087] The mass fractions of various substances in the basalt fiber composite modified asphalt based on Xinjiang asphalt of Examples 4-9 are detailed in Table 1.

[0088] Table 1

[0089]

[0090] The preparation method of the SBS / basalt fiber composite modified asphalt of Xinjiang asphalt in Examples 4-9 is the same as that in Example 1.

[0091] The following is a performance test of the Xinjiang asphalt-based basalt fiber composite modified asphalt prepared in Examples 1 to 9.

[0092] In order to verify the performance effect of the composite modified asphalt, the performance test of the SBS / basalt fiber composite modified Xinjiang asphalt material prepared in the embodiment of the present invention was carried out according to the relevant provisions of the test procedure of JTGE20-2011 "Asphalt and Asphalt Mixture for Highway Engineering".

[0093] Table 2 Performance test results of Xinjiang asphalt-based basalt fiber composite modified asphalt prepared in each embodiment.

[0094] Table 2

[0095]

[0096]

[0097] According to the "JTG F40-2004 Technical Specifications for Highway Asphalt Pavement Construction", it can be seen from Examples 1-9 in Table 2 that all meet the specifications for SBS modified asphalt and basalt fiber modified asphalt. Compared with Xinjiang asphalt, the needle penetration is slightly reduced, the softening point is slightly increased, and the 5°C ductility and rotational viscosity are greatly increased, indicating that with the addition of SBS and basalt fiber, SBS changes the properties of asphalt in asphalt, and basalt fiber forms a "reinforcement" effect inside the asphalt, which improves the high and low temperature resistance of the basalt fiber composite modified asphalt based on Xinjiang asphalt.

[0098] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A basalt fiber composite modified asphalt based on Xinjiang asphalt, characterized in that: Calculated by mass, it includes 100 parts of Xinjiang asphalt, 4-5 parts of SBS modifier, 2-6 parts of basalt fiber, 4-8 parts of aromatic-based filling oil, 2 parts of compatibilizer and 0.5 parts of stabilizer.

2. The basalt fiber composite modified asphalt based on Xinjiang asphalt according to claim 1, characterized in that: The Xinjiang asphalt includes Karamay asphalt and Tahe asphalt, with a mass ratio of (30%-40%): (70%-60%).

3. The basalt fiber composite modified asphalt based on Xinjiang asphalt according to claim 1, characterized in that: The SBS modifier is a star-shaped styrene-butadiene-styrene triblock copolymer with a block ratio of 3:7, non-oil-filled, and a molecular weight of 230,000-280,000.

4. The basalt fiber composite modified asphalt based on Xinjiang asphalt according to claim 1, characterized in that: The basalt fiber has a diameter of 5-45 μm and a length of 6-18 mm.

5. The basalt fiber composite modified asphalt based on Xinjiang asphalt according to claim 1, characterized in that: The aromatic-based filler oil comprises, by mass percentage, 70% aromatic hydrocarbons, 25% lubricants, 3% antioxidants and 2% preservatives.

6. The basalt fiber composite modified asphalt based on Xinjiang asphalt according to claim 1, characterized in that: The stabilizer is a sulfur-containing stabilizer.

7. A method for preparing basalt fiber composite modified asphalt based on Xinjiang asphalt according to any one of claims 1 to 6, characterized in that: include: Step 1, spray 2 parts of compatibilizer on 4-5 parts of SBS modifier and 2-6 parts of basalt fiber; Step 2, using Karamay asphalt and Tahe asphalt to prepare 100 parts of Xinjiang asphalt in a mass ratio of (30%-40%): (70%-60%); Step 3, dehydrate the Xinjiang asphalt obtained in step 2 and heat it to a fluid state, add 4-8 parts of aromatic filler oil and 0.5 parts of stabilizer and mix them evenly to obtain blended Xinjiang asphalt, then add the basalt fiber obtained in step 1 to the blended Xinjiang asphalt and stir them evenly to obtain modified asphalt; Step 4: Swelling and developing the modified asphalt obtained in step 3 to obtain SBS / basalt fiber composite modified asphalt based on Xinjiang asphalt.

8. The method for preparing basalt fiber composite modified asphalt based on Xinjiang asphalt according to claim 7, characterized in that: The preparation method of Xinjiang asphalt described in step 2 is as follows: The Karamay asphalt and the Tahe asphalt are mixed after being heated to a flowing state, and then the temperature is raised to 150°C±5°C to make the asphalt uniform, and Xinjiang asphalt is obtained after defoaming.

9. The method for preparing basalt fiber composite modified asphalt based on Xinjiang asphalt according to claim 7, characterized in that: The preparation method of the modified asphalt described in step 3 is as follows: The temperature of the blended Xinjiang asphalt is gradually raised to 170° C., an SBS modifier and basalt fiber are added to the blended Xinjiang asphalt, and then dispersed stirring and shear stirring are performed in sequence to obtain modified asphalt.

10. The method for preparing basalt fiber composite modified asphalt based on Xinjiang asphalt according to claim 7, characterized in that: In step 4, the modified asphalt is dried at 180° C. and then swelled and developed to obtain basalt fiber composite modified asphalt based on Xinjiang asphalt.

Images