CN113912329B - Compact ultrathin overlay asphalt mixture and preparation method thereof - Google Patents
Compact ultrathin overlay asphalt mixture and preparation method thereof Download PDFInfo
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- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
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- C—CHEMISTRY; METALLURGY
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- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
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Abstract
The invention relates to a compact ultrathin overlay asphalt mixture, which is prepared from the following raw materials of 100 parts of mineral aggregate, 6-8 parts of SBS modified asphalt, 0.12-0.48 part of high-viscosity agent, 0.018-0.048 part of warm-mixing agent, 0.12-0.64 part of high-elasticity agent and 0.3-0.45 part of basalt fiber. The mixture ratio of each component is configured through a large number of experiments, and finally the compact ultrathin mixture with high temperature, low temperature, water stability, fatigue resistance and flying resistance higher than the standard requirements is obtained, and the asphalt mixture is a small-particle-size dense-graded mixture, has the advantages of easiness in compaction, skid resistance, noise reduction and the like, has the thickness of 0.8-1.5 cm and low maintenance cost, can improve the high-temperature stability and crack resistance of the mixture through the doped basalt fiber, and is a durable, reliable and economical preventive maintenance material.
Description
Technical Field
The invention belongs to the technical field of road building materials, and relates to a compact ultrathin overlay asphalt mixture and a preparation method thereof.
Background
With the gradual improvement of the national highway network, the highway in China enters the development period of heavy construction and maintenance, and the highway entering the maintenance period every year is nearly 1 ten thousand Km according to incomplete statistics. After repeated load action for a plurality of years, the pavement of part of the expressway shows different degrees of diseases such as cracks, lack of fine aggregates, abrasion of coarse aggregates and the like, before structural diseases do not appear, the development of the diseases is further inhibited, and a high-speed maintenance department can adopt preventive maintenance technology such as ultrathin top covers, micro-surfacing and the like for pre-maintenance, so that the service life of the road is further prolonged, and the maintenance cost is saved.
The ultra-thin cover surface has the advantages of excellent material performance and extremely thin thickness, and is proved to be a rapid, economic and durable preventive maintenance, which not only can fully improve the driving comfort of the road surface, but also can reduce the maintenance cost and improve the service performance of the road. However, in the existing engineering practice, the dense grading ultrathin overlay still has the following problems that (1) the paving thickness of the ultrathin overlay is thin, the construction heat dissipation is too fast, the mixture is difficult to compact, the actually measured water seepage coefficient is too large, and the compacting effect is poor; (2) At present, the dynamic viscosity of modified asphalt at 60 ℃ is not less than 20000 Pa.s and the cohesion of the modified asphalt is insufficient, so that fine aggregates are easy to scatter and the early-stage anti-skid performance is obviously reduced in the technical specification of highway asphalt pavement maintenance (JTG 5142-2019); (3) The current specification has no evaluation system for the fatigue performance and the crack resistance of the asphalt mixture, and the crack resistance and the fatigue resistance of the asphalt mixture cannot be evaluated. Based on the limitations of the compact ultrathin layer top cover, modification and optimization of the material and a performance evaluation system thereof are needed.
Disclosure of Invention
In view of this, the present invention provides a compact ultrathin facing asphalt mixture and a preparation method of the compact ultrathin facing asphalt mixture.
In order to achieve the purpose, the invention provides the following technical scheme:
1. the compact ultrathin overlay asphalt mixture comprises the following raw materials: mineral aggregate, SBS modified asphalt, high-viscosity agent, warm-mixing agent, high-elasticity agent and basalt fiber.
Further, the raw materials of the compact ultrathin overlay asphalt mixture comprise the following components in parts by mass: 100 parts of mineral aggregate, 6-8 parts of SBS modified asphalt, 0.12-0.48 part of high-viscosity agent, 0.018-0.048 part of warm-mixing agent, 0.12-0.64 part of high-elasticity agent and 0.3-0.45 part of basalt fiber.
Furthermore, in the compact ultrathin overlay asphalt mixture, the high-viscosity agent accounts for 4-8% of the mass of the SBS modified asphalt, the warm-mixing agent accounts for 0.4-0.6% of the mass of the SBS modified asphalt, and the high-elasticity agent accounts for 2-6% of the mass of the SBS modified asphalt.
Further, the mineral aggregate is composed of aggregate and mineral powder, and the aggregate is basalt aggregate or diabase aggregate.
Further, the mineral aggregate is formed by mixing 94-98% of aggregate and 2-6% of limestone mineral powder in percentage by mass.
Further, the mineral aggregate is divided according to the particle size, and comprises 3-5 mm continuous gradation which accounts for 70-80% of the total mass of the mineral aggregate; the grain size is 0 mm-3 mm, and accounts for 20-30% of the total mass of the mineral aggregate.
Further, the gradation of the mineral aggregate is as follows:
further, the warm mixing agent is EVOTHER M1, and its density is 0.968g/cm 3 Viscosity at 20 ℃ of 660-1225；
The high-viscosity agent is a mixture of SEBS, SIS, carbon nine petroleum resin and carbon five petroleum resin;
the high-elasticity agent is aromatic base rubber oil, the flash point of which is more than or equal to 230 ℃, and the viscosity of which is more than or equal to 30;
the tensile strength of the basalt fiber is more than or equal to 1250Mpa, and the elongation at break is more than or equal to 3 percent.
Further, the preparation method of the SBS modified asphalt comprises the following steps:
mixing the following components in a mass ratio of 4-6: shearing 100 SBS and base asphalt at 180 deg.c at shearing rate of 2500-3500 rpm for 45min, adding SBS modified asphalt stabilizer, fast stirring at stirring rate of 800 rpm for 30min to complete the preparation, and the prepared SBS modified asphalt is suitable for the technological requirement of SBS modified asphalt I-D in JTG-F40-2004.
2. The preparation method of the dense ultrathin overlay asphalt mixture comprises the following specific steps:
(1) Preparing mineral aggregate, SBS modified asphalt, high-viscosity agent, warm-mixing agent, high-elasticity agent and basalt fiber in parts by weight;
(2) Preparing high-viscoelasticity SBS modified asphalt: firstly heating SBS modified asphalt to 180 +/-5 ℃, adding a high-viscosity agent and uniformly stirring, adjusting the rotating speed of a high-speed shearing machine to 3500-5500 revolutions/min, continuously shearing for 30-45 min, then adding a warm-mixing agent and a high-elasticity agent and uniformly stirring, adjusting the rotating speed of a high-speed stirrer to 300-800 revolutions/min, and continuously stirring for 10-15 min to prepare high-viscoelasticity SBS modified asphalt;
(3) Preparing a compact ultrathin overlay asphalt mixture: firstly, mixing aggregates, heating to 155-175 ℃, heating high-viscoelasticity SBS modified asphalt to 185 +/-5 ℃ to a flowing state, adding basalt cellulose into the aggregates, mixing and dry-mixing for 30s +/-5 s, then adding high-viscoelasticity SBS modified asphalt, wet-mixing for 60s +/-5 s, then adding mineral powder, mixing for 30s +/-5 s, and finally forming a test piece at 120 ℃ to obtain the compact ultrathin overlay asphalt mixture.
Aiming at the technical problem at present, the invention provides a high-elasticity modified asphalt and easy-to-compact ultrathin overlay asphalt mixture, wherein a warm-mix agent is added, the compaction property of the modified asphalt mixture is improved, the compaction degree and compactness of the mixture are improved, meanwhile, the molecular cohesion of SBS modified asphalt is improved by adding a high-viscosity agent, a high-elasticity agent and the like into SBS modified asphalt, so that the dynamic viscosity of asphalt is improved, the problems that the cohesion of modified asphalt is insufficient, stones are peeled off and scattered and the like in an ultrathin overlay are solved, finally, basalt fibers are added into the asphalt mixture, the asphalt film thickness of the asphalt mixture is further improved, the rutting resistance and the spalling resistance of the mixture are further improved, and the high-elasticity easy-to-compact ultrathin overlay asphalt mixture is finally formed. The mixture ratio of each component is configured through a large number of experiments, and finally the compact type ultrathin mixture with high temperature, low temperature, water stability, fatigue resistance and flying resistance higher than the standard requirements is obtained, and the asphalt mixture is a small-particle-size dense-graded mixture, has the advantages of easiness in compaction, skid resistance, noise reduction and the like, is 0.8-1.5 cm in thickness and low in maintenance cost, can improve the high-temperature stability and crack resistance of the mixture through the doped basalt fiber, and is a durable, reliable and economical preventive maintenance material.
Detailed Description
The preferred embodiments of the present invention will be described in detail below. The experimental procedures, in which specific conditions are not specified in the examples, are generally carried out under conventional conditions or under conditions recommended by the manufacturers.
The SBS modified asphalt is self-made by a laboratory, and the specific test conditions and materials are as follows:
(1) The SBS is linear SBS, the block ratio is 30/70, the tensile strength is 20MPa, and the Shore hardness is 76.
(2) The base asphalt is petroleum asphalt for 70# road according to JTG-F40-2004.
(3) The invention discloses an SBS modified asphalt stabilizer, which is produced by Jinan Heshun New Material Co.Ltd, and has the model number of HSSTAB-1, the effective component content of more than or equal to 95 percent and the density of 0.6-0.8g/cm 3 The melting point is more than or equal to 80 ℃, and the addition amount is 0.1-0.25 percent of the asphalt. Other commercial SBS modified asphalt stabilizers can also be selected.
The preparation method of the SBS modified asphalt comprises the following steps: shearing SBS and base asphalt (the mass ratio of the two is 4-6).
The warm mixing agent adopted in the invention is a warm mixing agent of American Invitroetto, the model is EVOTHER M1, and the density of the warm mixing agent is 0.968g/cm 3 Viscosity of 660-1225 at 20 ℃;
the high-viscosity agent adopted in the invention is a mixture of SEBS (Styrene Ethylene Styrene), SIS (Styrene-isoprene-Styrene block copolymer), carbon-nine petroleum resin and carbon-five petroleum resin, preferably, SEBS: SIS: carbon nine petroleum resin: carbon five petroleum resin is 100.
The high-elasticity agent adopted in the invention is aromatic-based rubber oil, the flash point of which is more than or equal to 230 ℃, and the viscosity of which is more than or equal to 30;
the tensile strength of the basalt fiber adopted in the invention is more than or equal to 1250Mpa, and the elongation at break is more than or equal to 3%. In the present invention, all the raw materials are commercially available unless otherwise specified.
The invention firstly discloses a compact ultrathin overlay asphalt mixture, which comprises the following raw materials:
(1) 100 parts of mineral aggregate;
(2) 6-8 parts of SBS modified asphalt;
(3) The high-elasticity agent accounts for 2 to 8 percent of the total mass of the SBS modified asphalt;
(4) The high adhesive accounts for 2 to 6 percent of the total mass of the SBS modified asphalt;
(5) The warm mixing agent accounts for 0.3 to 0.6 percent of the total mass of the SBS modified asphalt;
(6) Basalt fiber, which accounts for 0.3 to 0.45 percent of the total mass of the mineral aggregate;
wherein the mineral aggregate is formed by mixing 94-98 parts by mass of basalt or diabase aggregate and 2-6 parts by mass of limestone mineral powder. Wherein, the basalt or diabase aggregates are divided into coarse aggregates and fine aggregates according to the particle size.
The grain size of the mineral aggregate is 3 mm-5 mm, and the grain size of the mineral aggregate is 70-80% of the total mass of the mineral aggregate; the grain size of the mineral aggregate is 0 mm-3 mm continuous gradation (excluding 0mm, the same applies hereinafter), and accounts for 20-30% of the total mass of the mineral aggregate. The specific grading composition of the mixed mineral aggregate composition is shown in table 1 below:
TABLE 1 gradation composition of mineral aggregates
The invention also provides a preparation method of the high-viscoelasticity SBS modified asphalt, which comprises the following steps:
(1) Preparing raw materials according to the components and contents for later use;
(2) Heating SBS modified asphalt to 175-185 deg.c, adding high adhesive, regulating the rotation speed of the shearing machine to 3500-5500 rpm and shearing for 30-45 min;
(3) Sequentially adding the high-elasticity agent and the warm-mixing agent, adjusting the rotating speed of the shearing machine to 300-800 r/min, and continuously stirring for 5-15 min; thus preparing the high viscoelastic SBS modified asphalt. The high-visco-elastic SBS modified asphalt meets the requirements of the technical indexes in the following table 2:
TABLE 2 indexes of high-visco-elastic SBS modified asphalt
In addition, the invention provides a preparation method for preparing a compact ultrathin overlay asphalt mixture by using the warm-mixed high-viscoelastic SBS modified asphalt, which comprises the following steps:
(1) Preparing mineral aggregate according to a proportion, mixing the aggregate and heating to 155-175 ℃;
(2) Adding basalt cellulose fiber into the aggregate, mixing the basalt cellulose fiber with the aggregate in a dry mixing manner for 30s +/-5 s, adding warm-mixed high-viscoelasticity SBS modified asphalt preheated to 175-185 ℃, wet-mixing the basalt cellulose fiber with the aggregate for 60s, adding mineral powder, and mixing the mineral powder for 30s +/-5 s to obtain a compact ultrathin overlay asphalt mixture, wherein the detection method and the detection result of each performance index of the product are as follows in table 3:
TABLE 3 technical requirements of compact ultrathin overlay asphalt mixture
The asphalt mixture can be paved with the designed paving thickness of 0.8-1.5 cm, the paving temperature of the mixture is 110-150 ℃, the lowest initial pressure temperature is 110 ℃, the compaction is easy, and the compactness is high.
Example 1
The preparation method of the compact ultrathin overlay asphalt mixture comprises the following steps:
(1) Weighing 100 parts of mineral aggregate, 6 parts of SBS modified asphalt, 0.12 part of high-viscosity adhesive, 0.018 part of warm-mixing agent accounting for 0.3 percent of the total mass of the SBS modified asphalt, 0.24 part of high-elasticity agent accounting for 4 percent of the total mass of the SBS modified asphalt and 0.3 part of basalt fiber accounting for 0.3 percent of the total mass of the mineral aggregate in parts by weight.
(2) Designing a dense ultrathin overlay asphalt mixture gradation, wherein the mineral aggregate consists of 97 parts of basalt aggregate and 3 parts of limestone mineral powder, and the basalt aggregate is divided into coarse aggregate and fine aggregate according to the particle size; the mineral aggregate is in continuous gradation with the grain diameter of 3 mm-5 mm, and accounts for 75% of the total mass of the mineral aggregate; the mineral aggregate is continuous gradation with the grain diameter of 0 mm-3 mm, which accounts for 25 percent of the total mass of the mineral aggregate, and the synthetic gradation is as shown in the following table 4:
table 4:
(3) Preparing high-viscoelasticity SBS modified asphalt: firstly heating SBS modified asphalt to 175 ℃, then adding high-viscosity agent and stirring uniformly, adjusting the rotating speed of a high-speed shearing machine to 4500 r/min, continuously shearing for 30min, then adding warm-mixing agent and high-elasticity agent and stirring uniformly, adjusting the rotating speed of a high-speed stirrer to 500 r/min, and continuously stirring for 5min to obtain the high-viscoelasticity SBS modified asphalt.
(4) Preparing a compact ultrathin overlay asphalt mixture: firstly mixing aggregates, heating to 170 ℃, heating the high-visco-elastic SBS modified asphalt to 180 ℃ to be in a flowing state, then mixing the aggregates and basalt fiber, dry-mixing for 30s +/-5 s, then adding the high-visco-elastic SBS modified asphalt, wet-mixing for 60s +/-5 s, then adding mineral powder, and mixing for 30s +/-5 s to obtain the compact ultrathin overlay asphalt mixture. The detection method and detection results of various performance indexes of the product are shown in tables 9 and 10.
Example 2
The preparation method of the dense ultrathin overlay asphalt mixture comprises the following steps:
(1) Weighing 100 parts of mineral aggregate, 7 parts of SBS modified asphalt, 0.28 part of high-viscosity agent, 0.028 part of warm mixing agent, 0.42 part of high-elasticity agent and 0.35 part of basalt fiber according to parts by weight.
(2) Designing a dense ultrathin overlay asphalt mixture gradation, wherein the mineral aggregate consists of 95 parts of basalt aggregate and 5 parts of limestone mineral powder, and the mineral aggregate is a continuous gradation with the particle size of 3-5 mm and accounts for 80% of the total mass of the mineral aggregate; the mineral aggregate is continuous gradation with the grain diameter of 0 mm-3 mm, which accounts for 20 percent of the total mass of the mineral aggregate, and the synthetic gradation is as shown in the following table 5:
table 5:
(3) Preparing high-viscoelasticity SBS modified asphalt: firstly heating SBS modified asphalt to 180 +/-5 ℃, then adding a high-viscosity agent and uniformly stirring, adjusting the rotating speed of a high-speed shearing machine to 4000 revolutions/min, continuously shearing for 40min, then adding a warm-mixing agent and a high-elasticity agent and uniformly stirring, adjusting the rotating speed of a high-speed stirrer to 600 revolutions/min, and continuously stirring for 10min to obtain the high-viscoelasticity SBS modified asphalt.
(4) Preparing a compact ultrathin overlay asphalt mixture: firstly mixing aggregates, heating to 155-175 ℃, heating high-viscoelasticity SBS modified asphalt to a flowing state of 180 +/-5 ℃, then mixing basalt aggregates and basalt cellulose fibers, dry-mixing for 30s +/-5 s, then adding high-viscoelasticity SBS modified asphalt, wet-mixing for 60s +/-5 s, then adding mineral powder, and mixing for 30s +/-5 s to obtain the compact ultrathin overlay asphalt mixture.
Example 3
The preparation method of the dense ultrathin overlay asphalt mixture comprises the following steps:
(1) Weighing 100 parts of mineral aggregate, 6 parts of SBS modified asphalt, 0.36 part of high-viscosity agent, 0.024 part of warm mixing agent, 4.8 parts of high-elasticity agent and 0.45 part of basalt fiber in parts by weight.
(2) Designing a dense ultra-thin overlay asphalt mixture gradation, wherein mineral aggregate consists of 94 parts of basalt aggregate and 6 parts of limestone mineral powder by mass fraction, the basalt aggregate is divided into coarse aggregate and fine aggregate according to the particle size, and the particle size in the mineral aggregate is 3-5 mm, and accounts for 80% of the total mass of the mineral aggregate; the grain size of the mineral aggregate is 0 mm-3 mm, the continuous gradation accounts for 20% of the total mass of the mineral aggregate, and the synthetic gradation is as follows 6:
table 6:
(3) Preparing high-viscoelasticity SBS modified asphalt: firstly heating SBS modified asphalt to 180 +/-5 ℃, then adding high-viscosity agent and stirring uniformly, adjusting the rotating speed of a high-speed shearing machine to 4000 revolutions/min, continuously shearing for 40min, then adding warm-mixing agent and high-elasticity agent and stirring uniformly, adjusting the rotating speed of a high-speed stirrer to 600 revolutions/min, and continuously stirring for 10min to obtain the high-viscoelasticity SBS modified asphalt.
(4) Preparing a compact ultrathin overlay asphalt mixture: firstly mixing aggregates, heating to 155-175 ℃, heating high-viscoelasticity SBS modified asphalt to 180 +/-5 ℃ to a flowing state, then mixing the aggregates and basalt cellulose fibers, dry-mixing for 30s +/-5 s, then adding the high-viscoelasticity SBS modified asphalt, wet-mixing for 60s +/-5 s, then adding mineral powder, and mixing for 30s +/-5 s to obtain the compact ultrathin overlay asphalt mixture.
Example 4
The preparation method of the compact ultrathin overlay asphalt mixture comprises the following steps:
(1) Weighing 100 parts of mineral aggregate, 8 parts of SBS modified asphalt, 0.4 part of high-viscosity agent, 0.032 part of warm mixing agent, 0.32 part of high-elasticity agent and 0.45 part of basalt fiber in parts by weight.
(2) Designing a dense ultrathin overlay asphalt mixture gradation, wherein the mineral aggregate consists of 95 parts of diabase aggregate and 5 parts of limestone mineral powder by mass fraction, the diabase aggregate is divided into coarse aggregate and fine aggregate according to the particle size, and the continuous gradation with the particle size of 3-5 mm in the mineral aggregate accounts for 80% of the total mass of the mineral aggregate; the grain size of the mineral aggregate is 0 mm-3 mm, the continuous gradation accounts for 20% of the total mass of the mineral aggregate, and the synthetic gradation is as shown in the following table 7:
table 7:
(3) Preparing high-viscoelasticity SBS modified asphalt: firstly heating SBS modified asphalt to 180 +/-5 ℃, then adding a high-viscosity agent and uniformly stirring, adjusting the rotating speed of a high-speed shearing machine to 5000 revolutions per minute, continuously shearing for 30 minutes, then adding a warm-mixing agent and a high-elasticity agent and uniformly stirring, adjusting the rotating speed of a high-speed stirrer to 300 revolutions per minute, and continuously stirring for 15 minutes to prepare the high-viscoelasticity SBS modified asphalt.
(4) Preparing a compact ultrathin overlay asphalt mixture: firstly mixing aggregates, heating to 155-175 ℃, heating high-viscoelasticity SBS modified asphalt to 180 +/-5 ℃ to a flowing state, then mixing the aggregates and basalt cellulose fibers, dry-mixing for 30s +/-5 s, then adding the high-viscoelasticity SBS modified asphalt, wet-mixing for 60s +/-5 s, then adding mineral powder, and mixing for 30s +/-5 s to obtain the compact ultrathin overlay asphalt mixture.
Example 5
The preparation method of the dense ultrathin overlay asphalt mixture comprises the following steps:
(1) Weighing 100 parts of mineral aggregate, 6 parts of SBS modified asphalt, 0.3 part of high-viscosity agent, 0.03 part of warm mixing agent, 0.3 part of high-elasticity agent and 0.4 part of basalt fiber according to parts by weight.
(2) Designing a dense ultrathin overlay asphalt mixture gradation, wherein the mineral aggregate consists of 95 parts of diabase aggregate and 5 parts of limestone mineral powder by mass fraction, and the diabase aggregate is divided into coarse aggregate and fine aggregate according to particle size; the grain size of the mineral aggregate is 3 mm-5 mm, and the grain size is continuous gradation and accounts for 80% of the total mass of the mineral aggregate; the grain size of the mineral aggregate is 0 mm-3 mm, the continuous gradation accounts for 20% of the total mass of the mineral aggregate, and the synthetic gradation is as follows 8:
table 8:
(3) Preparing high-viscoelasticity SBS modified asphalt: firstly heating SBS modified asphalt to 180 +/-5 ℃, then adding high-viscosity agent and uniformly stirring, adjusting the rotating speed of a high-speed shearing machine to 4500 rpm, continuously shearing for 40min, then adding warm-mixing agent and high-elasticity agent and uniformly stirring, adjusting the rotating speed of a high-speed stirrer to 800 rpm, and continuously stirring for 10min to prepare the high-viscoelasticity SBS modified asphalt.
(4) Preparing a compact ultrathin overlay asphalt mixture: firstly mixing coarse aggregates and fine aggregates, heating to 155-175 ℃, heating high-viscoelasticity SBS modified asphalt to 180 +/-5 ℃ to be in a flowing state, then mixing the aggregates and basalt cellulose fibers, dry-mixing for 30s +/-5 s, then adding the high-viscoelasticity SBS modified asphalt, wet-mixing for 60s +/-5 s, then adding mineral powder, and mixing for 30s +/-5 s to obtain the compact ultrathin overlay asphalt mixture.
Example 6
The results of testing the technical indexes of the high viscoelastic SBS modified asphalt prepared in the examples 1-5 are shown in the following table 9, and the units of data, the technical requirements of test indexes and the testing method in the table are shown in the following table 2.
TABLE 9 technical index test results of high viscoelastic SBS modified asphalt
The detection results of various performance indexes of the compact ultrathin overlay asphalt mixture prepared in the examples 1 to 5 are shown in the following table 10, and the unit of data, the technical requirements of the performance indexes and the detection method in the table are shown in the following table 3.
Table 10 detection results of various performance indexes of compact ultrathin overlay asphalt mixture
In conclusion, the results of the relevant verification tests of the high-viscoelastic SBS modified asphalt and the compact ultrathin mixture thereof show that the high-viscoelastic SBS modified asphalt compact ultrathin mixture has the high-temperature, low-temperature, water-stability, fatigue resistance and flying resistance higher than the standard requirements, and the asphalt mixture is a small-particle-size compact-graded mixture, has the advantages of easy compaction, skid resistance, noise reduction and the like, has the thickness of 0.8 cm-1.5 cm, is low in maintenance cost, can improve the high-temperature stability and crack resistance of the mixture through the doped basalt fiber, and is a durable, reliable and economical preventive maintenance material.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, while the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (6)
1. The compact ultrathin overlay asphalt mixture is characterized in that the raw materials of the compact ultrathin overlay asphalt mixture consist of the following components in parts by mass: 100 parts of mineral aggregate, 6-8 parts of SBS modified asphalt, 0.12-0.48 part of high-viscosity agent, 0.018-0.048 part of warm-mixing agent, 0.12-0.64 part of high-elasticity agent and 0.3-0.45 part of basalt fiber; the preparation method of the SBS modified asphalt comprises the following steps: shearing SBS and matrix asphalt with the mass ratio of 4-6 at 180 ℃, wherein the shearing rate is 2500-3500 rpm, the shearing time is 45min, after the shearing is finished, adding SBS modified asphalt stabilizer, and carrying out rapid stirring development, wherein the stirring rate is 800 rpm, and the stirring time is 30 min; the warm mixing agent is EVOTHER M1, and the high-viscosity agent is a mixture of SEBS, SIS, carbon nine petroleum resin and carbon five petroleum resin; the high elastic agent is aromatic hydrocarbon-based rubber oil, the tensile strength of the basalt fiber is more than or equal to 1250Mpa, and the elongation at break is more than or equal to 3%; wherein the mineral aggregate is divided according to the particle size, comprises 3 mm-5 mm continuous gradation, and accounts for 70-80% of the total mass of the mineral aggregate; the grain size is 0 mm-3 mm, and accounts for 20-30% of the total mass of the mineral aggregate.
2. The compact ultrathin overlay asphalt mixture according to claim 1, wherein in the compact ultrathin overlay asphalt mixture, the high-viscosity agent accounts for 2-6% of the mass of SBS modified asphalt, the warm-mixing agent accounts for 0.4-0.6% of the mass of SBS modified asphalt, and the high-elasticity agent accounts for 2-8% of the mass of SBS modified asphalt.
3. Compact ultra-thin overlay asphalt mix according to claim 1 or 2, characterized in that said mineral aggregate consists of aggregates and mineral fines, the aggregates being basalt or diabase aggregates.
4. A compact ultra-thin overlay asphalt mixture according to claim 3, wherein the mineral aggregate is formed by mixing 94-98% of aggregate and 2-6% of limestone mineral powder.
5. A compact ultra-thin overlay asphalt mix according to claim 1, wherein the mineral aggregate is graded as follows:
6. the preparation method of the compact ultrathin overlay asphalt mixture according to any one of claims 1 to 5 is characterized by comprising the following specific steps:
(1) Preparing mineral aggregate, SBS modified asphalt, high-viscosity agent, warm-mixing agent, high-elasticity agent and basalt fiber in parts by weight;
(2) Preparing high-viscoelasticity SBS modified asphalt: firstly, heating SBS modified asphalt to 180 +/-5 ℃, adding a high-viscosity adhesive and uniformly stirring, adjusting the rotating speed of a high-speed shearing machine to 3500-5500 r/min, continuously shearing for 30-45 min, then adding a warm-mixing agent and a high-elasticity agent and uniformly stirring, adjusting the rotating speed of a high-speed stirrer to 300-800 r/min, and continuously stirring for 10-15 min to prepare high-visco-elastic SBS modified asphalt;
(3) Preparing a compact ultrathin overlay asphalt mixture: firstly, mixing aggregates, heating to 155-175 ℃, heating high-viscoelasticity SBS modified asphalt to 185 +/-5 ℃ to a flowing state, adding basalt cellulose into the aggregates, mixing and dry-mixing for 30s +/-5 s, then adding high-viscoelasticity SBS modified asphalt, wet-mixing for 60s +/-5 s, then adding mineral powder, mixing for 30s +/-5 s, and finally forming a test piece at 120 ℃ to obtain the compact ultrathin overlay asphalt mixture.
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