CN112430008A - Steel slag stress absorbing layer material and preparation method thereof - Google Patents
Steel slag stress absorbing layer material and preparation method thereof Download PDFInfo
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- CN112430008A CN112430008A CN202011302548.3A CN202011302548A CN112430008A CN 112430008 A CN112430008 A CN 112430008A CN 202011302548 A CN202011302548 A CN 202011302548A CN 112430008 A CN112430008 A CN 112430008A
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- steel slag
- absorbing layer
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- layer material
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- 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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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a steel slag stress absorbing layer material and a preparation method thereof, wherein the method comprises the following steps: 1) weighing 7-14 parts of mineral powder, 100-200 parts of steel slag aggregate, 9-19 parts of SBS modified asphalt and 0-0.4 part of brucite mineral fiber according to weight parts; 2) heating the aggregate and the mineral powder at the constant temperature of 170-180 ℃ for more than 4 hours for later use; 3) heating the SBS modified asphalt to 170-180 ℃, and fully and uniformly stirring for later use; 4) and (2) dry-mixing the steel slag aggregate heated at the constant temperature for 25-35 s, adding brucite mineral fibers, dry-mixing for 8-12 s, adding the heated SBS modified asphalt, wet-mixing for 85-95 s, and finally adding mineral powder and mixing for 15-25 s. The stress absorbing layer material manufactured by the invention has high viscoelasticity and good fatigue cracking resistance; the preparation method is simple in process, economical and environment-friendly, and has important practical significance and economic value.
Description
Technical Field
The invention relates to the field of asphalt pavement material preparation, in particular to a steel slag stress absorption layer material and a preparation method thereof, which are used between a cement concrete pavement and an asphalt cover coat.
Background
No matter newly-built asphalt pavement or old road additionally paved with an asphalt surface layer, the micro cracks are continuously expanded under the interaction of temperature and traffic load, stress concentration is easily generated at the bottom of the asphalt surface layer, and the cracks are expanded to the asphalt surface layer, so that reflection cracks are formed.
The existence of the reflection cracks can destroy the integrity and continuity of the pavement, and influence the use quality of the pavement and the attractive appearance of the pavement; on the other hand, the existence of the cracks provides infiltration channels for the road surface water, and the road surface water enters the base layer and the roadbed through the cracks, so that the strength and the rigidity of the roadbed are greatly weakened, and the service performance of the pavement is seriously influenced.
In addition, with the rapid development of roads and town roads in China, the demand of road materials is increased year by year, the demand of natural aggregates such as basalt is huge every year, but the existing resource reserves are limited, and the exploitation is forbidden in many regions due to the environmental protection policy.
The steel slag is typical industrial waste slag, has certain potential gelling activity, can be used as a commercial concrete admixture through a certain processing technology, is energy-saving and environment-friendly, and is a green high-performance concrete raw material advocated by China. If industrial waste residue resources can be utilized to the maximum extent, the cost can be reduced, the problem of shortage of natural mineral raw material resources can be relieved, and sustainable development can be realized.
Therefore, the development of the steel slag stress absorbing layer material has important practical significance and economic value.
Disclosure of Invention
The invention provides a steel slag stress absorbing layer material and a preparation method thereof for solving the technical problems, and the steel slag stress absorbing layer material is used between a cement concrete pavement and an asphalt cover coat. The filler fiber is selected from brucite fiber and asphalt, the adhesion work (62.48Wa) of the brucite fiber and asphalt is greater than that of basalt fiber (59.82Wa) and glass fiber (60.56Wa), the oil absorption is less than that of lignin fiber and polyester fiber, and the brucite fiber has the advantages of low price and economy and becomes the best choice. The invention realizes the waste utilization of the steel slag, is economic and environment-friendly, and has important practical significance and economic value.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the steel slag stress absorbing layer material is used between a cement concrete pavement and an asphalt top facing layer and comprises, by weight, 7-14 parts of mineral powder, 100-200 parts of steel slag aggregate, 9-19 parts of SBS modified asphalt and 0-0.4 part of brucite mineral fiber. The brucite mineral fibers here cannot assume 0.
Preferably, the steel slag aggregate is prepared from converter steel slag or electric furnace steel slag.
Preferably, the alkalinity of the steel slag aggregate is not less than 2.2, namely the ratio of the sum of the contents of calcium oxide and magnesium oxide to the content of silicon dioxide in the steel slag is not less than 2.2.
Preferably, the steel slag aggregate comprises the following components in percentage by weight:
72-76% of steel slag with nominal grain size of 0-3 mm;
16-20% of steel slag with nominal grain size of 3-5 mm;
the steel slag with the nominal grain diameter of 5-10 mm accounts for 6-9%.
Preferably, the steel slag aggregate comprises the following components in percentage by weight: 74.6 percent of steel slag with nominal grain diameter of 0-3 mm; 18 percent of steel slag with nominal grain diameter of 3-5 mm; the steel slag with the nominal grain diameter of 5-10 mm accounts for 7.4 percent.
Preferably, the brucite mineral fibers have an average length of 1.0-3.5 mm and an average diameter of 3.0-8.0 μm.
Preferably, the brucite mineral fiber has the tensile strength of 892.4-1283.7 MPa.
Preferably, the thermal decomposition dehydration temperature of the brucite mineral fibers is 400-500 ℃.
Preferably, the SBS modified asphalt meets the technical requirements of polymer modified asphalt in road asphalt pavement construction technical Specification JTG F40-2004, and belongs to the I-B or I-C series of SBS modified asphalt listed in road asphalt pavement construction technical Specification JTG F40-2004.
The preparation method of the steel slag stress absorbing layer material comprises the following steps:
step 1, weighing 7-14 parts of mineral powder, 100-200 parts of steel slag aggregate, 9-19 parts of SBS modified asphalt and 0-0.4 part of brucite mineral fiber according to parts by weight;
step 2, heating the steel slag aggregate and the mineral powder at the constant temperature of 170-180 ℃ for more than 4 hours for later use;
step 3, heating the SBS modified asphalt to 170-180 ℃, and fully and uniformly stirring for later use;
and 4, dry-mixing the steel slag aggregate heated at the constant temperature for 25-35 s, adding brucite mineral fibers, dry-mixing for 8-12 s, adding the heated SBS modified asphalt, wet-mixing for 85-95 s, and finally adding mineral powder and mixing for 15-25 s.
Compared with the prior art, the invention has the beneficial effects that:
1. the brucite fibers have the reinforcement effect and the bridging effect on the SBS asphalt matrix, so that the capability of the stress absorbing layer for dispersing the stress at the tip of the crack of the semi-rigid base layer is greatly enhanced, and the manufactured stress absorbing layer material has high viscoelasticity and excellent fatigue cracking resistance;
2. the excellent adhesion property of the steel slag and the asphalt is utilized to realize the waste recycling of the solid waste, and the preparation method has the advantages of simple flow, economy, environmental protection and important practical significance and economic value.
Detailed Description
The steel slag stress absorbing layer of the present invention will be described in further detail with reference to the following examples, but the present invention is not limited to the following examples.
The steel slag aggregate selected in the embodiment is shown in table 1:
TABLE 1
Comparative example 1
The preparation of the steel slag stress absorbing layer material comprises the following steps:
step 1, weighing 7 parts of mineral powder, 100 parts of steel slag aggregate and 9 parts of SBS modified asphalt according to weight;
step 2, heating the aggregate and the mineral powder at a constant temperature of 170-180 ℃ for 5 hours for later use;
step 3, heating the SBS modified asphalt to 170-180 ℃, and fully and uniformly stirring for later use;
and 4, dry-mixing the constant-temperature heated steel slag aggregate for 30s, adding the heated SBS modified asphalt, wet-mixing for 90s, and finally adding the mineral powder and mixing for 20 s.
Example 1
The preparation of the steel slag stress absorbing layer material comprises the following steps:
step 1, weighing 7 parts of mineral powder, 100 parts of steel slag aggregate, 9 parts of SBS modified asphalt and 0.2 part of brucite mineral fiber according to weight;
step 2, heating the aggregate and the mineral powder at a constant temperature of 170-180 ℃ for 5 hours for later use;
step 3, heating the SBS modified asphalt to 170-180 ℃, and fully and uniformly stirring for later use;
and 4, dry-mixing the steel slag aggregate heated at the constant temperature for 30s, adding brucite mineral fibers, dry-mixing for 10s, adding the heated SBS modified asphalt, wet-mixing for 90s, and finally adding the mineral powder and mixing for 20 s.
Example 2
The preparation of the steel slag stress absorbing layer material comprises the following steps:
step 1, weighing 14 parts of mineral powder, 200 parts of steel slag aggregate, 19 parts of SBS modified asphalt and 0.4 part of brucite mineral fiber according to weight;
step 2, heating the aggregate and the mineral powder at a constant temperature of 170-180 ℃ for 5 hours for later use;
step 3, heating the SBS modified asphalt to 170-180 ℃, and fully and uniformly stirring for later use;
and 4, dry-mixing the steel slag aggregate heated at the constant temperature for 30s, adding brucite mineral fibers, dry-mixing for 10s, adding the heated SBS modified asphalt, wet-mixing for 90s, and finally adding the mineral powder and mixing for 20 s.
Example 3
The preparation of the steel slag stress absorbing layer material comprises the following steps:
step 1, weighing 7 parts of mineral powder, 100 parts of steel slag aggregate, 9 parts of SBS modified asphalt and 0.3 part of brucite mineral fiber according to weight parts;
step 2, heating the aggregate and the mineral powder at a constant temperature of 170-180 ℃ for 5 hours for later use;
step 3, heating the SBS modified asphalt to 170-180 ℃, and fully and uniformly stirring for later use;
and 4, dry-mixing the steel slag aggregate heated at the constant temperature for 30s, adding brucite mineral fibers, dry-mixing for 10s, adding the heated SBS modified asphalt, wet-mixing for 90s, and finally adding the mineral powder and mixing for 20 s.
Samples were taken from the steel slag stress absorbing layer materials prepared in the above examples and comparative examples, and the following test piece forming tests were carried out:
1) compacting and molding by a Marshall compaction instrument to complete the preparation of a Marshall test piece of the steel slag stress absorbing layer material, and the Marshall test piece is used for testing the volume parameter of the test piece;
2) and rolling the steel slag stress absorbing layer material rut plate by adopting a rut wheel mill for testing the high-temperature stability, the low-temperature crack resistance and the fatigue performance of the test piece.
The test pieces prepared above were subjected to the test, and the results are shown in table 2. With comparative example 2 from the state of minnesota stress absorbing layer mix, usa.
TABLE 2 Steel slag stress absorption layer Performance index
As can be seen from table 2, the stress absorbing layer materials of the above examples 1 to 3 exhibit the characteristics of low porosity, high density and high fatigue failure times, and both the low temperature performance and the high temperature performance of the stress absorbing layer materials are superior to those of the comparative example 1 without the brucite mineral fiber, and both the low temperature performance and the high temperature performance of the stress absorbing layer materials are close to those of the stress absorbing layer mixture of the state of minnesota in the united states.
This is mainly because: 1) the steel slag and the asphalt have smaller contact angle, and the asphalt is easier to wet the surface of the steel slag, so that the excellent adhesion performance of the steel slag and the asphalt is reflected. 2) The porous structure in the steel slag has an ultra-large specific surface area, and asphalt components and high polymer components sequentially permeate into the porous structure to construct a spatial network structure with interpenetration and high viscoelasticity, so that the elasticity and elastic recovery of the stress absorbing layer material are enhanced, and the fatigue cracking resistance of the stress absorbing layer material is improved; 3) the fine brucite fibers are tangled or stretched into the porous loose steel slag in the stress absorbing layer anti-cracking material doped with the coal gasification fine slag, so that a good bridging reinforcement effect is achieved, and the fatigue resistance of the stress absorbing layer anti-cracking material is further improved.
Although the present invention has been described in detail in this specification with reference to specific embodiments and illustrative embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the present invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (9)
1. The steel slag stress absorbing layer material is used between a cement concrete pavement and an asphalt top coat and is characterized by comprising, by weight, 7-14 parts of mineral powder, 100-200 parts of steel slag aggregate, 9-19 parts of SBS modified asphalt and 0-0.4 part of brucite mineral fibers.
2. The steel slag stress absorbing layer material of claim 1, wherein the steel slag aggregate is prepared from converter steel slag or electric furnace steel slag.
3. The steel slag stress absorbing layer material as set forth in claim 1 or 2, wherein the basicity of the steel slag aggregate is not less than 2.2.
4. The steel slag stress absorbing layer material as set forth in claim 1, wherein the steel slag aggregate comprises the following components in parts by weight:
72-76% of steel slag with nominal grain size of 0-3 mm;
16-20% of steel slag with nominal grain size of 3-5 mm;
the steel slag with the nominal grain diameter of 5-10 mm accounts for 6-9%.
5. The steel slag stress absorbing layer material as set forth in claim 4, wherein the steel slag aggregate comprises the following components in parts by weight: 74.6 percent of steel slag with nominal grain diameter of 0-3 mm; 18 percent of steel slag with nominal grain diameter of 3-5 mm; the steel slag with the nominal grain diameter of 5-10 mm accounts for 7.4 percent.
6. The steel slag stress absorbing layer material as set forth in claim 1, wherein the brucite mineral fibers have an average length of 1.0 to 3.5mm and an average diameter of 3.0 to 8.0 μm.
7. The steel slag stress absorbing layer material as set forth in claim 1, wherein the brucite mineral fibers have a tensile strength of 892.4-1283.7 Mpa.
8. The steel slag stress absorbing layer material as set forth in claim 1, wherein the brucite mineral fibers have a thermal decomposition dehydration temperature of 400-500 ℃.
9. The method for preparing the steel slag stress absorbing layer material according to any one of claims 1 to 8, comprising the steps of:
step 1, weighing 7-14 parts of mineral powder, 100-200 parts of steel slag aggregate, 9-19 parts of SBS modified asphalt and 0-0.4 part of brucite mineral fiber according to parts by weight;
step 2, heating the steel slag aggregate and the mineral powder at the constant temperature of 170-180 ℃ for more than 4 hours for later use;
step 3, heating the SBS modified asphalt to 170-180 ℃, and fully and uniformly stirring for later use;
and 4, dry-mixing the steel slag aggregate heated at the constant temperature for 25-35 s, adding brucite mineral fibers, dry-mixing for 8-12 s, adding the heated SBS modified asphalt, wet-mixing for 85-95 s, and finally adding mineral powder and mixing for 15-25 s.
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| CN202011302548.3A CN112430008A (en) | 2020-11-19 | 2020-11-19 | Steel slag stress absorbing layer material and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113477365A (en) * | 2021-07-09 | 2021-10-08 | 内蒙古高等级公路建设开发有限责任公司 | Steel slag stress decomposition and fragmentation processing device |
| CN114014589A (en) * | 2021-11-15 | 2022-02-08 | 江苏东交智控科技集团股份有限公司 | Asphalt surface function recovery mixture, preparation method thereof and pavement structure |
| CN116657481A (en) * | 2023-04-12 | 2023-08-29 | 湖南省高速公路集团有限公司 | Steel slag doped asphalt concrete wearing layer and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113477365A (en) * | 2021-07-09 | 2021-10-08 | 内蒙古高等级公路建设开发有限责任公司 | Steel slag stress decomposition and fragmentation processing device |
| CN114014589A (en) * | 2021-11-15 | 2022-02-08 | 江苏东交智控科技集团股份有限公司 | Asphalt surface function recovery mixture, preparation method thereof and pavement structure |
| CN116657481A (en) * | 2023-04-12 | 2023-08-29 | 湖南省高速公路集团有限公司 | Steel slag doped asphalt concrete wearing layer and preparation method thereof |
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Application publication date: 20210302 |