CN113666667B - Water-loss-resistant sulfur-modified asphalt mixture and preparation method thereof - Google Patents
Water-loss-resistant sulfur-modified asphalt mixture and preparation method thereof Download PDFInfo
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F292/00—Macromolecular compounds obtained by polymerising monomers on to inorganic materials
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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Abstract
The invention discloses a water loss resistant sulfur modified asphalt mixture, which comprises the following components in parts by weight: 95-100 parts of aggregate, 1-5 parts of modified sulfur and 3-8 parts of asphalt; the modified sulfur is prepared by polymerizing and modifying sulfur by utilizing dipentene and isooctyl acrylate, and the modified sulfur comprises the following raw materials in percentage by mass: 96-98% of sulfur, 1-2% of dipentene, 0-1% of isooctyl acrylate and 0-1% of external additive. The sulfur modified asphalt mixture provided by the invention can greatly improve the problems of insufficient water stability and the like of the sulfur modified asphalt mixture while ensuring good high-temperature performance of the sulfur modified asphalt mixture, and the related preparation method is simple and is suitable for popularization and application.
Description
Technical Field
The invention belongs to the technical field of road building materials, and particularly relates to a water-loss-resistant sulfur modified asphalt mixture and a preparation method thereof.
Background
As early as the early 20 th century, people have begun to use sulfur as a modifier to improve the road performance related to asphalt mixtures; but due to the rising sulfur price and the release of H in the production process of the sulfur-modified asphalt mixture 2 S and other sulfur-containing toxic gases seriously restrict the development of the technology for changing sulfur into asphalt. Until the early stage of the 20 th century 80 s, sulfur modifier SEAM researched and produced by Rockbande USA better solves the problem of sulfur-containing gas emission in the production process, so that the sulfur modified asphalt technology is widely applied again. In the decades of 1981 to 1990, the United states and Canada have built a plurality of highways by using sulfur modified asphalt mixtures. Since the 21 st century, the construction cost of asphalt pavement is increasing due to the rising international oil price. The sulfur is used as a modifier of the asphalt, a part of the asphalt can be replaced by adopting an internal mixing method, the pressure on the resource in the supply of the asphalt can be effectively relieved, and meanwhile, the engineering cost of the pavement can be greatly reduced by gradually reducing the price of the sulfur, so that the sulfur becomes a hot point of the research in the industry in recent years.
Patent CN107523072A discloses a warm-mixed sulfur asphalt, which adopts warm-mixed agent prepared by taking polyethylene wax as a raw material through a sweating process; the obtained warm-mixed sulfur asphalt reduces the preparation temperature and the use temperature of the sulfur asphalt, reduces the generation amount of harmful gas, and simultaneously improves the high-temperature stability of the asphalt pavement. Patent CN 169019 discloses a sulfur modified asphalt mixture for paving asphalt pavement, which is prepared by mixing sulfur, carbon, smoke inhibitor and plasticizer to form modified sulfur, and adding the modified sulfur into asphalt mixture; the construction process of the mixture is that the mixing temperature is not higher than 150 ℃, the rolling temperature is not lower than 90 ℃, and the harmful gas in the construction process can be effectively reduced. Greatly improving the pavement quality.
However, the existing sulfur modified asphalt mixture usually has the problems of serious insufficient water stability and the like. The research on the asphalt vulcanization process indicates that hydrogen in the asphalt is captured by sulfur in the vulcanization process to generate hydrogen sulfide, and meanwhile, a sulfur-containing group is generated in the crosslinking action of the sulfur and asphalt molecules, so that the original composition and properties of the asphalt are changed, the average molecular weight of the modified asphalt is increased, the viscosity of the modified asphalt is reduced, and the water stability of the asphalt is reduced. Therefore, the further exploration of the sulfur modified asphalt mixture with better water stability has important research and application significance.
Disclosure of Invention
The invention mainly aims to provide a water damage resistant sulfur modified asphalt mixture aiming at the problems and the defects in the prior art, which has good high-temperature stability, can reduce the construction temperature of 20 to 30 ℃, has better water stability, and can effectively solve the problems of insufficient water stability and the like of the existing road modified sulfur asphalt mixture; and the related preparation method is simple, convenient to operate and suitable for popularization and application.
In order to realize the purpose, the invention adopts the technical scheme that:
the water loss resistant sulfur modified asphalt mixture comprises the following components in parts by weight: 95-100 parts of aggregate, 1-5 parts of modified sulfur and 3-8 parts of asphalt; wherein the modified sulfur is prepared by polymerizing and modifying sulfur by utilizing dipentene and/or isooctyl acrylate.
In the scheme, the modified sulfur comprises the following raw materials in percentage by mass: 96 to 98 percent of sulfur, 1 to 2 percent of dipentene, 0.1 to 1 percent of isooctyl acrylate and 0 to 1 percent of external admixture.
Preferably, in the raw material of the modified sulfur, the mass percentage of the isooctyl acrylate is 0.3 to 0.7%.
More preferably, in the raw material of the modified sulfur, the mass percentage of the isooctyl acrylate is 0.3 to 0.5%.
In the scheme, the external admixture is formed by compounding zinc stearate and zinc hydroxystannate according to the mass ratio of 1 (1) - (2).
In the scheme, the preparation method of the modified sulfur comprises the following steps: uniformly mixing the sulfur, the dipentene, the isooctyl acrylate and the admixture, heating to 130-170 ℃, reacting for 2-6 h, and cooling to room temperature to obtain the modified sulfur.
In the scheme, the asphalt is road petroleum asphalt.
In the scheme, the mineral aggregate comprises the following components in percentage by mass: 85 to 99 percent of aggregate and 1 to 10 percent of mineral powder.
In the scheme, the aggregate can be selected from one or more of common aggregates of road engineering such as basalt, limestone, glauconite, steel slag aggregate and the like, and the synthetic grading of the mineral aggregate meets the requirements of the recommended range of the current highway asphalt pavement construction technical specification in China; the filler can be mineral powder, cement, slaked lime, etc. ground by limestone.
Preferably, the mass percentage of the isooctyl acrylate in the modified sulfur raw material is 0.1 to 0.7 percent.
Preferably, the mass percentage of the admixture in the modified sulfur raw material is 0.1 to 1%.
More preferably, the sulfur composite modified asphalt mixture is mainly prepared from the following raw materials in parts by weight: 95 parts of mineral aggregate, 3.4 parts of asphalt and 1.4 parts of modified sulfur;
wherein the mineral aggregate comprises the following components in percentage by weight: 97% of aggregate and 3% of mineral powder;
the percentage of the modified sulfur is as follows: 97% of sulfur, 2% of dipentene, 0.5% of isooctyl acrylate and 0.5% of external admixture.
The preparation method of the water loss resistant sulfur modified asphalt mixture comprises the following steps:
1) Weighing the raw materials according to the proportion;
2) Drying the weighed aggregate, adding modified sulfur under the heating condition, and uniformly stirring; and sequentially adding asphalt and mineral powder, and uniformly stirring to obtain the water loss resistant sulfur modified asphalt mixture.
In the scheme, the heating temperature in the step 1) is 120-140 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1) According to the invention, the polymerization reaction is carried out on the sulfur, the dipentene and the isooctyl acrylate under the high-temperature condition, the sulfur micromolecules are connected into a macromolecule long chain, and the long chain is fully fused with the asphalt in the subsequent mixing process of the mixture and is wrapped on the surface of the mixture, so that the water stability performance of the mixture can be effectively improved; based on the functional group modification effect of the dipentene and the isooctyl acrylate, the water stability, the mechanical property and the high-temperature property of the obtained mixture can be synchronously improved;
2) The melting points of dipentene, isooctyl acrylate and sulfur are not greatly different, and a plurality of substances can be better fused with each other under the high-temperature condition, so that the reaction is promoted to be more uniform and sufficient;
3) The water loss resistant sulfur modified asphalt mixture obtained by the invention can further obviously improve the water stability on the premise of maintaining and further effectively improving the good road performance of the sulfur modified asphalt mixture, and has important application and popularization significance;
4) The preparation method provided by the invention is simple, convenient to operate and suitable for popularization and application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following examples, the aggregate used was glauconite; the mineral aggregate synthetic gradation is AC13 class aggregate which meets the requirements of the recommended range of the current highway asphalt pavement construction technical specification in China; the filler is fine limestone ground mineral powder;
the adopted asphalt is matrix No. 70 asphalt;
in the following examples, the external doping agent used was compounded from zinc stearate and zinc hydroxystannate in a mass ratio of 1.
Example 1
The preparation method of the water loss resistant sulfur modified asphalt mixture comprises the following steps:
1) Preparing modified sulfur; weighing the components in proportion, wherein the components and the mass percentage of the components are as follows: 97.5 percent of sulfur, 2 percent of dipentene and 0.5 percent of external admixture; uniformly mixing the weighed sulfur, dipentene and the external doping agent, placing the mixture into a reaction kettle, heating the mixture to 170 ℃, keeping the temperature and reacting for 4 hours, and then cooling the mixture to room temperature to obtain modified sulfur:
2) Preparing an asphalt mixture; weighing the raw materials according to the proportion, wherein the raw materials comprise the following components in parts by weight: 95 parts of mineral aggregate (97 percent of aggregate and 3 percent of mineral powder), 3.4 parts of asphalt and 1.4 parts of modified sulfur; drying the weighed aggregate in a drying oven at 140 ℃ for 4 hours, then pouring the dried aggregate into a stirring pot at 140 ℃, adding modified sulfur, and stirring for 60 seconds; adding asphalt and continuing stirring for 60 seconds;
adding mineral powder and continuing stirring for 120 seconds to obtain the water loss resistant sulfur modified asphalt mixture.
The results of the performance tests of the asphalt mixture obtained in this example are shown in Table 1.
Table 1 results of performance test of asphalt mixture obtained in example 1
| Marshall stability (KN) | Stability of immersion residue (%) | Splitting strength (MPa) | Freeze-thaw split strength ratio (%) | Degree of dynamic stability (times/mm) | |
| Example 1 | 15.21 | 85.4 | 1.12 | 82.3 | 2714 |
| Test method | T0709-2011 | T0709-2011 | T0729-2000 | T0729-2000 | T0719-2011 |
Example 2
The preparation method of the water loss resistant sulfur modified asphalt mixture comprises the following steps:
1) Preparing modified sulfur; weighing the components in proportion, wherein the components comprise the following components in percentage by mass: 97 percent of sulfur, 2 percent of dipentene, 0.5 percent of isooctyl acrylate and 0.5 percent of external admixture; uniformly mixing the weighed sulfur, dipentene and the admixture, placing the mixture into a reaction kettle, heating the mixture to 170 ℃, keeping the temperature and reacting for 4 hours, and then cooling the mixture to room temperature to obtain modified sulfur:
2) Preparing an asphalt mixture; weighing the raw materials according to the proportion, wherein the raw materials and the weight portions of the raw materials are as follows: 95 parts of mineral aggregate (97 percent of aggregate and 3 percent of mineral powder), 3.4 parts of asphalt and 1.4 parts of modified sulfur; drying the weighed aggregate in a drying oven at 140 ℃ for 4 hours, then pouring the dried aggregate into a stirring pot at 140 ℃, adding modified sulfur, and stirring for 60 seconds; adding asphalt and continuing stirring for 60 seconds; adding mineral powder and continuing stirring for 120 seconds to obtain the water loss resistant sulfur modified asphalt mixture.
The results of the performance tests of the asphalt mixture obtained in this example are shown in Table 2.
Table 2 results of performance test of asphalt mixture obtained in example 2
| Marshall stability (KN) | Stability of immersion residue (%) | Splitting strength (MPa) | Freeze-thaw split strength ratio (%) | Degree of dynamic stability (times/mm) | |
| Example 2 | 16.64 | 90.2 | 1.35 | 88.9 | 2852 |
| Test method | T0709-2011 | T0709-2011 | T0729-2000 | T0729-2000 | T0719-2011 |
Example 3
The preparation method of the water loss resistant sulfur modified asphalt mixture is substantially the same as that of the embodiment 1, except that the modified sulfur comprises the following components in percentage by mass: 97.2 percent of sulfur, 2 percent of dipentene, 0.3 percent of isooctyl acrylate and 0.5 percent of admixture.
The results of the performance tests of the obtained asphalt mixture are shown in table 3.
Table 3 results of performance test of asphalt mixture obtained in example 3
| Marshall stability (KN) | Stability of immersion residue (%) | Splitting strength (MPa) | Freeze-thaw split strength ratio (%) | Degree of dynamic stability (times/mm) | |
| Example 5 | 16.03 | 88.5 | 1.29 | 84.6 | 2831 |
| Test method | T0709-2011 | T0709-2011 | T0729-2000 | T0729-2000 | T0719-2011 |
Example 4
The preparation method of the water loss resistant sulfur modified asphalt mixture is substantially the same as that of the embodiment 1, except that the modified sulfur comprises the following components in percentage by mass: 96.8 percent of sulfur, 2 percent of dipentene, 0.7 percent of isooctyl acrylate and 0.5 percent of external admixture.
The results of the performance tests of the obtained asphalt mixture are shown in Table 4.
Table 4 results of performance test of asphalt mixture obtained in example 4
| Marshall stability (KN) | Stability of immersion residue (%) | Splitting strength (MPa) | Freeze-thaw split strength ratio (%) | Dynamic stability (times/mm) | |
| Example 5 | 14.23 | 87.2 | 1.06 | 80.4 | 2498 |
| Test method | T0709-2011 | T0709-2011 | T0729-2000 | T0729-2000 | T0719-2011 |
Comparative example 1
The preparation method of the common sulfur modified asphalt mixture is the same as that of the embodiment, but the sulfur is directly used for replacing the modified sulfur in the embodiment 1; the results of the performance tests of the obtained asphalt mixture are shown in Table 5.
TABLE 5 results of performance test of asphalt mixture obtained in comparative example 1
| Marshall stability (KN) | Stability of immersion residue (%) | Splitting strength (MPa) | Freeze-thaw split strength ratio (%) | Degree of dynamic stability (times/mm) | |
| Comparative example 1 | 14.98 | 82.5 | 1.15 | 78.9 | 2688 |
| Test method | T0709-2011 | T0709-2011 | T0729-2000 | T0729-2000 | T0719-2011 |
Comparative example 2
The preparation method of the sulfur modified asphalt mixture with water loss resistance in the embodiment is substantially the same as that in the embodiment 1, and the difference is that the modified sulfur comprises the following components in percentage by mass: 96% of sulfur, 2% of dipentene, 1.5% of isooctyl acrylate and 0.5% of external additive. The results of the performance tests of the obtained asphalt mixture are shown in Table 6.
The preparation method is similar to example 1.
Table 6 results of performance test of asphalt mixture obtained in comparative example 2
| Marshall stability (KN) | Stability of immersion residue (%) | Splitting strength (MPa) | Freeze-thaw split strength ratio (%) | Degree of dynamic stability (times/mm) | |
| Comparative example 2 | 9.09 | 72.8 | 0.61 | 37.7 | 1618 |
| Test method | T0709-2011 | T0709-2011 | T0729-2000 | T0729-2000 | T0719-2011 |
The above results show that: the water loss resistant sulfur modified asphalt mixture prepared by the scheme of the invention can obviously improve the water stability of the sulfur modified asphalt and synchronously ensure other service performances; particularly, when the mixing amount of the isooctyl acrylate is 0.5%, the soaking residual stability of the obtained asphalt mixture is up to 90.2%, the splitting strength is up to 1.35 MPa, the freeze-thaw splitting strength ratio is up to 88.9%, the dynamic stability is up to 2852 times/mm, and the water stability, the mechanical property and the high-temperature property of the obtained asphalt mixture can be synchronously and obviously improved.
The above embodiments are merely examples for clearly illustrating the present invention and do not limit the present invention. Other variants and modifications of the invention, which are obvious to those skilled in the art and can be made on the basis of the above description, are not necessary or exhaustive for all embodiments, and are therefore within the scope of the invention.
Claims (8)
1. The water loss resistant sulfur modified asphalt mixture is characterized by comprising the following components in parts by weight: 95-100 parts of mineral aggregate, 1-5 parts of modified sulfur and 3-8 parts of asphalt; wherein the modified sulfur is prepared by polymerizing and modifying sulfur by utilizing dipentene and isooctyl acrylate;
the modified sulfur comprises the following raw materials in percentage by mass: 96 to 98 percent of sulfur, 1 to 2 percent of dipentene, 0.1 to 0.7 percent of isooctyl acrylate and 0 to 1 percent of external admixture.
2. The water damage resistant sulfur modified asphalt mixture according to claim 1, wherein the external additive is prepared by compounding zinc stearate and zinc hydroxystannate according to a mass ratio of 1 (1) - (2).
3. The water damage resistant sulfur modified asphalt mixture according to claim 1, wherein the preparation method of the modified sulfur comprises the following steps: uniformly mixing the sulfur, the dipentene, the isooctyl acrylate and the admixture, heating to 130-170 ℃, reacting for 2-6 h, and cooling to room temperature to obtain the modified sulfur.
4. The water damage resistant sulfur modified asphalt mixture according to claim 1, wherein the asphalt is one or more of road petroleum asphalt, polymer modified asphalt, lake asphalt and rock asphalt.
5. The water damage resistant sulfur modified asphalt mixture according to claim 1, wherein the mineral aggregate comprises the following components in percentage by mass: 85 to 99 percent of aggregate and 1 to 15 percent of mineral powder.
6. The water damage resistant sulfur modified asphalt mixture according to claim 5, wherein the aggregate is one or more of basalt, limestone, glauconite and steel slag aggregate.
7. The preparation method of the water damage resistant sulfur-modified asphalt mixture according to any one of claims 1 to 6, which is characterized by comprising the following steps:
1) Weighing the raw materials according to the proportion;
2) Drying the weighed aggregate, adding modified sulfur under the heating condition, and uniformly stirring; and sequentially adding asphalt and mineral powder, and uniformly stirring to obtain the water loss resistant sulfur modified asphalt mixture.
8. The method for preparing a polyurethane foam according to claim 7, wherein the heating temperature in the step 2) is 120 to 140 ℃.
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| EP2281788A1 (en) * | 2009-08-06 | 2011-02-09 | Shell Internationale Research Maatschappij B.V. | Modified sulphur composition and product comprising modified sulphur composition as binder |
| CN102321373B (en) * | 2011-08-17 | 2013-03-20 | 爱思开(北京)公路科技有限公司 | Warm mixed asphalt and preparation method thereof |
| KR101658893B1 (en) * | 2015-08-26 | 2016-09-23 | 범준이엔씨 주식회사 | Modified sulfur binder composition, method for preparing modified sulfur binder, modified sulfur binder using the same and modified asphalt composition comprising the same |
| CN105776958B (en) * | 2016-03-17 | 2018-01-05 | 国路高科（北京）工程技术研究院有限公司 | A kind of preparation method of SBS modified asphalt concretes |
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