CN113801489B - Rubber powder modified asphalt for pavement repair and preparation method thereof - Google Patents
Rubber powder modified asphalt for pavement repair and preparation method thereof Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C—CHEMISTRY; METALLURGY
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Abstract
The invention belongs to the technical field of road engineering materials, and discloses rubber powder modified asphalt for road surface repair and a preparation method thereof. The rubber powder modified asphalt comprises the following components in parts by weight: 100 parts of asphalt; 30-40 parts of rubber powder; 2 to 3.5 parts of thermoplastic elastomer; HIPS 0.1-0.5 part; PPB 1-3 parts; 2-5 parts of tackifying resin. The preparation method comprises the following steps: heating asphalt to 240-260 ℃, adding rubber powder, stirring and mixing uniformly, cooling to 180-200 ℃, adding thermoplastic elastomer and tackifying resin, stirring and mixing uniformly, and finally adding HIPS and PPB, stirring and reacting to obtain the rubber powder modified asphalt for road surface repair. The rubber powder modified asphalt has the advantages of good stability, good high-low temperature performance, high strength and aging resistance, can be used for repairing a pavement, and prolongs the service life of the pavement.
Description
Technical Field
The invention belongs to the technical field of road engineering materials, and particularly relates to rubber powder modified asphalt for road surface repair and a preparation method thereof.
Background
The design service life of asphalt concrete pavement in China is fifteen to twenty years, the practical service life of asphalt concrete pavement is eight to twelve years due to the problems of pavement damage and the like, the practical service life is obviously shorter than the design standard life, and according to practical experience, the fund investment of asphalt pavement is less than half of the total cost fund of highway, and most of maintenance expenditure is used in the repair of ground, so that the damage of pavement diseases can be seen to be huge.
The asphalt material has the great defect of poor high and low temperature resistance, so that the asphalt material is exposed to the environments of vehicle extrusion, high and low temperature, alternate dry and wet weather and the like for a long time, various problems of cracks (transverse cracks, longitudinal cracks, netlike cracks), ruts, pits and the like, which reduce the durability of the pavement, are easily caused in an asphalt road, if the cracks cannot be repaired effectively in time at the initial stage of generation, the cracks can be prevented from being continuously expanded, the crack degree can be increased under the extrusion action of the vehicle, and meanwhile, the stability and the strength of a base layer can be seriously weakened through the penetration of road surface water into the roadbed through the cracks. Therefore, development of the asphalt pavement crack repair technology has important significance in reducing maintenance cost, prolonging the service life of the road and ensuring the safety of drivers.
The development of suitable pavement repair materials is an important step in asphalt pavement crack repair technology. The repairing material has good bonding capability with the prior pavement structure, can play a role for a long time and has good ageing resistance and high-low temperature stability. The pavement repairing materials on the market at present comprise chemical grouting materials (epoxy resin grouting materials, polyurethane grouting materials, self-repairing materials and the like), but asphalt materials are the most widely used and the most mature technology. Compared with other pavement repair materials, the asphalt material has stronger cohesiveness and better combination with the original pavement. However, the existing asphalt materials have the problems of poor construction workability and poor high-low temperature performance or other performances, so that it is very important to develop asphalt which can keep certain cohesiveness with the original pavement and ensure other performances to meet the use requirements.
Patent CN 111825994A discloses and a high-ductility high-elasticity modified asphalt composition, which increases the elasticity characteristic and high-temperature index of asphalt by adding a proper amount of thermoplastic elastomer; by adding the propylene-ethylene block copolymer, the ductility of asphalt at 5 ℃ is effectively increased, so that the asphalt has good deformation resistance at low temperature, and the mat coat is ensured to have good ductility at lower ambient temperature; by adding the tertiary butyl phenol formaldehyde resin, the resin is vulcanized rubber, a three-dimensional space grid structure can be formed in asphalt, so that the polymer can be uniformly dispersed and relatively fixed in the asphalt, the occurrence of polymer segregation is effectively avoided, and the storage stability of the asphalt is improved. However, the simple phenolic resin has limited stability and strength improvement effect on asphalt, the 60-degree viscosity of the phenolic resin can only reach about 10 ten thousand, the bonding effect with the original pavement is poor, and the pavement performance is poor. And the composition does not correspondingly improve the thermo-oxidative aging resistance of the material.
Patent CN 107266919A discloses a stable rubber and SBS composite modified asphalt, which is prepared by using styrene-butadiene-styrene, butyl acrylate rubber, butyl rubber, aromatic oil, naphthenic oil, castor oil, sulfur, alumina and organic phosphite ester as modified components and interacting with matrix asphalt, and the obtained composite modified asphalt has good high-temperature stability, low-temperature crack resistance and ageing resistance, small segregation degree and good storage stability. But the reactivity between SBS and rubber is poor, and the comprehensive improvement effect is limited.
Disclosure of Invention
In view of the above drawbacks and shortcomings of the prior art, a primary object of the present invention is to provide a rubber powder modified asphalt for road surface repair. The modified asphalt adopts the thermoplastic elastomer and rubber molecules for composite modification, and simultaneously rubber graft copolymer polystyrene (HIPS) is added to promote the crosslinking reaction of the thermoplastic elastomer and the rubber molecules, so that the net structure is firmer; the propylene-ethylene block copolymer and the special tackifying resin are added for co-modification, and the obtained modified asphalt has good high-low temperature performance and ageing resistance, and can enhance the durability of the repaired pavement; the asphalt material has good construction workability, high viscosity and plasticity, can be well bonded with the original pavement, has enhanced water loss resistance, overcomes the defect that the traditional asphalt material for pavement repair has different performances, and has certain economic and social benefits.
The invention also aims to provide a preparation method of the rubber powder modified asphalt for road surface repair.
The invention aims at realizing the following technical scheme:
the rubber powder modified asphalt for repairing the pavement comprises the following components in parts by weight:
100 parts of asphalt;
30-40 parts of rubber powder;
2 to 3.5 parts of thermoplastic elastomer;
rubber graft copolymer polystyrene (HIPS) 0.1-0.5 parts;
1-3 parts of propylene-ethylene block copolymer (PPB);
2-5 parts of tackifying resin.
Further, the asphalt is selected from petroleum asphalt with a penetration of 30-500 dmm at 25 ℃.
Further, the rubber powder is selected from rubber powder obtained by processing junked tires. The rubber powder has wide sources and low cost, and can change waste into valuable.
Further, the thermoplastic elastomer is selected to be a styrene-butadiene-styrene block copolymer (SBS).
Further, the tackifying resin is a resin substance for improving the surface adhesion of the material, and as a preferable technical scheme, polysulfone resin is particularly selected.
The preparation method of the rubber powder modified asphalt for road surface repair comprises the following preparation steps:
heating asphalt to 240-260 ℃, adding rubber powder, stirring and mixing uniformly, cooling to 180-200 ℃, adding thermoplastic elastomer and tackifying resin, stirring and mixing uniformly, and finally adding HIPS and PPB, stirring and reacting to obtain the rubber powder modified asphalt for road surface repair.
Further, the stirring speed of the whole process of the preparation method is 1000-1500 r/min.
Compared with the prior art, the invention has the beneficial effects that:
(1) The modified asphalt of the invention is added with a certain amount of rubber powder (30-40% relative to the mass of asphalt) and the traditional thermoplastic elastomer, so that the modified asphalt has good road performance, and the asphalt mixture is ensured to have the characteristics of sufficient storage stability, high-temperature stability, low-temperature crack resistance, fatigue resistance and the like. The rubber powder can be obtained from the waste tires through treatment, and has the advantages of wide sources and low cost.
(2) According to the modified asphalt, a small amount (0.1% -0.5% relative to the mass of the asphalt) of the stabilizer HIPS is added, and the specific structural stabilizer can promote the cross-linking reaction between SBS molecules and rubber molecules and between SBS and SBS molecules, so that the net structure is firmer, and the modified asphalt has good ageing resistance and high-low temperature performance; meanwhile, the storage stability of the modified asphalt is greatly improved due to the desulfurization and degradation of the rubber powder, and the phenomena of segregation and the like are avoided, so that the possibility of transporting and actually applying the modified asphalt to pavement repair is greatly increased.
(3) According to the invention, by adding specific tackifying resin, particularly polysulfone resin, the polysulfone resin not only can promote the adhesive force of the asphalt material, but also has excellent ageing resistance, oxygen in the structure of the polysulfone resin has a highly resonant diaryl sulfone group, sulfur atoms are in a complete oxidation state, the polysulfone resin has extremely excellent oxidation resistance and heat resistance due to the high resonance of the sulfone groups, and the asphalt material can be prevented from being in failure under the conditions of heat, light and oxygen to a certain extent, so that the asphalt material has good ageing resistance; meanwhile, compared with other tackifying resins, the polysulfone resin has excellent creep resistance, and particularly can obviously improve the high-temperature performance of the modified asphalt material at high temperature. The viscosity of the modified asphalt is improved while the storage stability is ensured, so that the asphalt has enough adhesiveness, the advantage is very obvious when the asphalt is applied to pavement repair, and the enough adhesiveness can be well bonded with the original pavement, so that the asphalt is effectively combined into a whole, the service life of the asphalt is prolonged, and the pavement performance of the asphalt is improved.
(4) The propylene-ethylene block copolymer has higher rigidity and better low-temperature toughness, compared with various thermoplastic resins, the brittleness is obviously improved, the creep resistance of the propylene-ethylene block copolymer can be obviously improved when the propylene-ethylene block copolymer is added into asphalt materials, the ageing resistance of modified asphalt is improved, the problems of loosening and falling, pit and the like caused by aging of pavement asphalt can be solved when the propylene-ethylene block copolymer is applied to pavement repair, and the propylene-ethylene block copolymer has good practical value. The quality of road surface repair can be improved and the service life of road surface repair can be prolonged.
Detailed Description
The present invention will be described in further detail with reference to examples, but embodiments of the present invention are not limited thereto.
In the following examples, the asphalt used was the asphalt for Ecable No. 70 road, the rubber powder was rubber powder produced by Sichuan mountain, the styrene-butadiene-styrene triblock copolymer (SBS) was YH791 produced by Yueyang petrochemical company, the stabilizer rubber graft copolymer polystyrene (HIPS) was produced by Zhenjiang Qiyaku beautifier Co., ltd., guangzhou petrochemical company, the propylene-ethylene block copolymer (PPB) was produced by Beijing Yanshan petrochemical company, and the tackifier polysulfone resin was produced by Shanghai Kaiser chemical Co., ltd.
In the following examples, the performance test criteria are "Highway engineering asphalt and asphalt mixture test procedure" (JTGE 20-2011) and AASHTO, and the test methods are: penetration, T0604-2011; softening point, T0606-2011; ductility, T0605-2011; viscosity at 60 degrees, T0620-2000; segregation, 48h softening point difference, T0661-2011; RTFOT, T0610-2011; PG classification, AASHTO T315.
Examples 1 to 3
The present examples 1 to 3 are rubber powder modified asphalt for road surface repair with different rubber powder addition amounts, and include the formulation compositions shown in the following table 1. The preparation method of the rubber powder modified asphalt comprises the following steps:
heating asphalt to 250 ℃, adding rubber powder, stirring for 6 hours, uniformly mixing, cooling to 190 ℃, adding thermoplastic elastomer and tackifying resin, uniformly stirring, and finally adding HIPS and PPB, stirring and reacting for 30 minutes to obtain the rubber powder modified asphalt for road surface repair. The stirring speed of the whole process of the preparation method is controlled to be 1000-1500 r/min.
The results of the test for the properties of the asphalt as it is and the residue after RTFOT are shown in Table 1 below.
TABLE 1
As shown by the test results in Table 1, as the weight portion of the rubber powder is gradually increased, the softening point of the modified asphalt is increased from 76 ℃ to 81.2 ℃, the ductility of 5 ℃ is reduced from 43.2cm to 32.5cm, the viscosity of the asphalt at 60 ℃ is also increased, the high-temperature PG classification is increased from 76 ℃ to 82 ℃, and the low-temperature PG classification is reduced from-28 ℃ to-22 ℃, so that SBS can improve the high-temperature performance of the modified asphalt, and the performance of the modified asphalt is still superior under the composite action of other functional components although the low-temperature performance of the modified asphalt is slightly reduced.
Examples 4 to 6
Examples 4-6 are rubber powder modified asphalt for road surface repair with different SBS addition, and comprise the following formula composition shown in Table 2. The preparation method of the rubber powder modified asphalt comprises the following steps:
heating asphalt to 250 ℃, adding rubber powder, stirring for 6 hours, uniformly mixing, cooling to 190 ℃, adding thermoplastic elastomer and tackifying resin, uniformly stirring, and finally adding HIPS and PPB, stirring and reacting for 30 minutes to obtain the rubber powder modified asphalt for road surface repair. The stirring speed of the whole process of the preparation method is controlled to be 1000-1500 r/min.
The results of the test for the properties of the asphalt as it is and the residue after RTFOT are shown in Table 2 below.
TABLE 2
As shown by the test results in Table 2, as the weight fraction of SBS increases from 2.5 to 3.5, the softening point of asphalt increases from 79.6 ℃ to 85.7 ℃, the high-temperature PG classification increases from 76 ℃ to 88 ℃, and the ductility at 5 ℃ increases from 39.6cm to 47.5cm, which indicates that the increase of the SBS doping amount is remarkable in improving the high-temperature performance and the low-temperature performance of the modified asphalt, and can meet the use requirements.
Examples 7 to 9
Examples 7-9 are rubber powder modified asphalt for road surface repair with different amounts of HIPS stabilizer, and include the formulation shown in Table 3 below. The preparation method of the rubber powder modified asphalt comprises the following steps:
heating asphalt to 250 ℃, adding rubber powder, stirring for 6 hours, uniformly mixing, cooling to 190 ℃, adding thermoplastic elastomer and tackifying resin, uniformly stirring, and finally adding HIPS and PPB, stirring and reacting for 30 minutes to obtain the rubber powder modified asphalt for road surface repair. The stirring speed of the whole process of the preparation method is controlled to be 1000-1500 r/min.
The results of the test for the properties of the obtained asphalt as it is and the residue after RTFOT are shown in Table 3 below.
TABLE 3 Table 3
As can be seen from the test results in Table 3, in the examples where the stabilizer was added, the difference between the softening points of the upper and lower portions was 3.1℃and the difference between the softening points of the modified asphalt was significantly decreased even when the amount of the stabilizer was 0.1, indicating that the addition of the stabilizer greatly improved the storage stability of the modified asphalt. Compared with modified asphalt obtained when HIPS is not added, the modified asphalt has obviously improved softening point, ductility, viscosity and PG classification temperature, which proves that HIPS is added to obviously improve asphalt strength (plasticity) and high and low temperature performance. And the penetration value of the residues after RTFOT changes less, which shows that the addition of HIPS has remarkable improvement on the high-temperature aging resistance of asphalt. The HIPS special structure can promote the cross-linking reaction between SBS molecules and rubber molecules and between SBS and SBS molecules, so that the net structure is firmer, and the asphalt strength, stability, high-low temperature performance and ageing resistance are improved. Meets the use requirement of the pavement repair material, and the repaired asphalt pavement has better durability.
Examples 10 to 12
The present examples 10 to 12 are rubber powder modified asphalt for road surface repair with different amounts of copolymer PPB, and include the formulation shown in Table 4 below. The preparation method of the rubber powder modified asphalt comprises the following steps:
heating asphalt to 250 ℃, adding rubber powder, stirring for 6 hours, uniformly mixing, cooling to 190 ℃, adding thermoplastic elastomer and tackifying resin, uniformly stirring, and finally adding HIPS and PPB, stirring and reacting for 30 minutes to obtain the rubber powder modified asphalt for road surface repair. The stirring speed of the whole process of the preparation method is controlled to be 1000-1500 r/min.
The results of the test for the properties of the obtained asphalt as it is and the residual after RTFOT are shown in Table 4 below.
TABLE 4 Table 4
As shown by the test results in Table 4, the low-temperature PG classification of the modified asphalt without the copolymer PPB is-16 ℃, and the low-temperature PG classification is changed from-16 ℃ to-28 ℃ along with the increase of the blending amount of the copolymer, which shows that the addition of the copolymer PPB can obviously improve the low-temperature performance of the modified asphalt, and the low-temperature performance of the repaired asphalt pavement is better.
Examples 13 to 15
Examples 13-15 are rubber powder modified asphalt for road surface repair with different addition amounts of tackifier polysulfone resin, and comprise the following formulation shown in Table 5. The preparation method of the rubber powder modified asphalt comprises the following steps:
heating asphalt to 250 ℃, adding rubber powder, stirring for 6 hours, uniformly mixing, cooling to 190 ℃, adding thermoplastic elastomer and tackifying resin, uniformly stirring, and finally adding HIPS and PPB, stirring and reacting for 30 minutes to obtain the rubber powder modified asphalt for road surface repair. The stirring speed of the whole process of the preparation method is controlled to be 1000-1500 r/min.
The results of the test for the properties of the obtained asphalt as it is and the residue after RTFOT are shown in Table 5 below.
TABLE 5
As shown in the test results of the table 5, the modified asphalt without the tackifier has lower 60 DEG viscosity and poorer bonding effect with the original road surface, and after the tackifier is added, the viscosity of the modified asphalt is increased, the bonding performance with the original road surface is obviously improved, the service life of the repaired road surface is prolonged, and the road performance is improved; meanwhile, the performance of the modified asphalt without polysulfone resin is obviously reduced after aging, the penetration ratio is reduced to 69%, the ductility is reduced to 23.1cm, the asphalt is hardened and becomes brittle, the aging degree is deeper, the performance of the modified asphalt after aging with polysulfone resin is less attenuated, the aging resistance of the modified asphalt can be improved by adding the aging inhibitor, and the durability of the repaired asphalt pavement is better.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (3)
1. The rubber powder modified asphalt for repairing the pavement is characterized by comprising the following components in parts by weight:
100 parts of asphalt;
30-40 parts of rubber powder;
2-3.5 parts of thermoplastic elastomer;
0.1-0.5 part of rubber graft copolymer polystyrene;
1-3 parts of propylene-ethylene block copolymer;
2-5 parts of tackifying resin;
the asphalt is selected from petroleum asphalt with the penetration degree of 30-500 dmm at 25 ℃;
the rubber powder is selected from rubber powder obtained by processing waste tires;
the thermoplastic elastomer is selected to be a styrene-butadiene-styrene block copolymer;
the tackifying resin is selected to be polysulfone resin.
2. The method for preparing the rubber powder modified asphalt for pavement repair according to claim 1, which is characterized by comprising the following preparation steps:
and heating the asphalt to 240-260 ℃, adding rubber powder, stirring and mixing uniformly, cooling to 180-200 ℃, adding a thermoplastic elastomer and tackifying resin, stirring and mixing uniformly, and finally adding rubber graft copolymer polystyrene and a propylene-ethylene block copolymer, stirring and reacting to obtain the rubber powder modified asphalt for road surface repair.
3. The method for preparing the rubber powder modified asphalt for pavement repair according to claim 2, which is characterized in that: the stirring speed of the whole process of the preparation method is 1000-1500 r/min.
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| CN101104739A (en) * | 2007-06-27 | 2008-01-16 | 中国海洋石油总公司 | Gelatine powder modified asphalt and processing method thereof |
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| JP2001131348A (en) * | 1999-11-08 | 2001-05-15 | Bridgestone Corp | Method of manufacturing for asphalt modifier |
| CN1148417C (en) * | 2001-07-05 | 2004-05-05 | 上海交通大学 | Polystyrene modified asphalt material with high high-temperature storage stability |
| KR100700078B1 (en) * | 2005-04-06 | 2007-03-28 | 허정도 | Compositions and manufacturing methods of bitumen modifiers having complex functionality |
| CN103073903B (en) * | 2013-02-05 | 2016-02-03 | 西安公路研究院 | A kind of rubber powder modified asphalt and preparation method thereof |
| CN105368084B (en) * | 2015-12-16 | 2017-11-10 | 刘小平 | A kind of modified pitch and preparation method thereof |
| CN109943085A (en) * | 2019-03-20 | 2019-06-28 | 广西交通科学研究院有限公司 | A kind of composite modified high-viscosity asphalt of noise reduction drainage pavement rubber powder and preparation method |
| CN111825994B (en) * | 2020-08-06 | 2022-06-17 | 上海缤德新材料科技有限公司 | High-ductility high-elasticity modified asphalt composition and preparation method thereof |
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