CN109455982B - Asphalt concrete for road and bridge construction and preparation method thereof - Google Patents
Asphalt concrete for road and bridge construction and preparation method thereof Download PDFInfo
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- CN109455982B CN109455982B CN201811580633.9A CN201811580633A CN109455982B CN 109455982 B CN109455982 B CN 109455982B CN 201811580633 A CN201811580633 A CN 201811580633A CN 109455982 B CN109455982 B CN 109455982B
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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
Abstract
The invention discloses an asphalt concrete for road and bridge construction and a preparation method thereof, wherein the asphalt concrete comprises the following components in parts by weight: 120 portions of asphalt and 125 portions of; 35-40 parts of fly ash; quartz sand: 30-40 parts; 38-45 parts of macadam; 4-6 parts of a water reducing agent; 7-10 parts of a coagulation regulator; emulsifier: 0.3-0.5 part; defoaming agent: 0.2 part; 5-7 parts of fibers; the cellulose is composed of fiber monomers, the fiber monomers are composed of steel fibers and a plurality of PET fibers which are bonded at the tail ends of the steel fibers and are in a bundle shape, and at least one part of the PET fibers is different in length.
Description
Technical Field
The invention relates to concrete, in particular to asphalt concrete for road and bridge construction and a preparation method thereof.
Background
The asphalt concrete is commonly called as asphalt concrete, and is a mixture prepared by manually selecting mineral aggregate with a certain gradation composition, broken stone or crushed gravel, stone chips or sand, mineral powder and the like, and mixing the mineral aggregate, the broken stone or crushed gravel, the stone chips or sand, the mineral powder and a certain proportion of road asphalt material under strictly controlled conditions.
Asphalt is an organic high polymer material, has poor aging resistance, and can generate aging, cracking and damage after being used for years.
Disclosure of Invention
Aiming at the defects in the prior art, the first purpose of the invention is to provide the asphalt concrete for road and bridge construction, which has good crack resistance.
The technical purpose of the invention is realized by the following technical scheme: the asphalt concrete for road and bridge construction comprises the following components in parts by weight:
120 portions of asphalt and 125 portions of;
35-40 parts of fly ash;
quartz sand: 30-40 parts;
38-45 parts of macadam;
4-6 parts of a water reducing agent;
7-10 parts of a coagulation regulator;
emulsifier: 0.3-0.5 part;
defoaming agent: 0.2 part;
5-7 parts of fibers;
the cellulose is composed of a fiber monomer, the fiber monomer is composed of steel fibers and a plurality of PET fibers which are bonded at the tail ends of the steel fibers and are in a bundle shape, and at least one part of the PET fibers is different in length.
The fly ash, the quartz sand and the gravel are used as aggregates, and the use of the fly ash, the quartz sand and the water reducing agent can improve the fluidity, so that the cellulose can flow and disperse in the concrete conveniently, and the cellulose is in the concrete; meanwhile, the lengths of the plurality of PET fibers of the fiber monomers are different, so that self-winding is not easy to occur.
Further, the longest length ratio of the steel fibers and the PET fibers is 3: 1.
The steel fiber mainly plays a role in cracking resistance, the PET fiber mainly plays a role in connection, and certainly has a certain cracking resistance, so that the length of the steel fiber is longer than that of the PET fiber, and the proportion is determined to be more appropriate through experiments.
Furthermore, the lengths of the PET fibers are symmetrically and gradually arranged from the middle PET fiber to two sides in a stepped mode.
Therefore, the PET fibers on two sides are longer and are easier to be wound with other PET fibers of other fiber monomers.
Further, the coagulation regulator is sodium sulfate.
Further, the water reducing agent is a polycarboxylic acid water reducing agent.
Further, the emulsifier is dodecyl ammonium chloride.
Further, the defoaming agent is a polyether defoaming agent.
The second purpose of the invention is to provide a preparation method of asphalt concrete for road and bridge construction, which comprises the following steps: heating the asphalt to 160 ℃ and 180 ℃, adding the fly ash, the quartz sand and the crushed stone, and stirring for 30 seconds; adding 4-6 parts of water reducing agent, coagulation regulator, expanding agent and defoaming agent, and stirring for 60 seconds; finally, 5 to 7 parts of cellulose is added and stirred for 20 seconds at 140 ℃.
In conclusion, the invention has the following beneficial effects: the invention improves the structure of cellulose, thereby improving the integral anti-cracking performance of the concrete.
Drawings
FIG. 1 is a schematic view showing the connection of steel fibers and PET fibers in example 1;
FIG. 2 is a schematic view showing the connection of the steel fibers and the PET fibers in example 4;
FIG. 3 is a schematic view showing the connection of the steel fibers and the PET fibers in example 5.
Reference numerals: 1. steel fibers; 2. PET fiber.
Detailed Description
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Example 1: an asphalt concrete for road and bridge construction is prepared from asphalt, powdered coal ash, quartz sand, broken stone, water-reducing agent, coagulation regulator, emulsifier, defoaming agent and cellulose.
The cellulose is composed of fiber monomers, the fiber monomers are composed of steel fibers 1 and a plurality of PET fibers 2 which are adhered to the tail ends of the steel fibers 1 and are in a bundle shape, and at least one part of the PET fibers 2 is different in length.
The section of the steel fiber 1 is rectangular, the length is 0.6mm, the width is 0.2mm, and the length of the steel fiber 1 is 30 mm; the cross section of the PET fiber 2 is circular, the diameter is 0.1mm, the longest is 10mm, and the shortest is 4 mm. The lengths of the PET fibers 2 are arranged in a stepwise increasing manner from the middle PET fiber 2 to both sides (see fig. 1).
The asphalt model is 70#, and the coagulation regulator is sodium sulfate; the water reducing agent is a polycarboxylic acid water reducing agent with the model number of DH-4005; the emulsifier is dodecyl ammonium chloride; the defoaming agent is polyether defoaming agent, and the model is German AGITANP 803.
The preparation method of the asphalt concrete for road and bridge construction comprises the following steps: heating the asphalt to 160 ℃ and 180 ℃, adding the fly ash, the quartz sand and the crushed stone, and stirring for 30 seconds; adding the water reducing agent, the coagulation regulator, the expanding agent and the defoaming agent, and stirring for 60 seconds; finally, cellulose was added and stirred at 140 ℃ for 20S.
Examples 2 and 3, asphalt concrete for road and bridge construction, which is different from example 1 in the component content, are as follows.
Table 1: bituminous concrete compositions and content schemes of examples 1-3
Embodiment 4 is an asphalt concrete for road and bridge construction, which is different from embodiment 1 in that: the lengths of the PET fibers are symmetrically and gradually decreased from the most middle PET fiber to two sides (as shown in figure 2).
Example 5: an asphalt concrete for road and bridge construction, which is different from the embodiment 1: the lengths of the PET fibers decrease from one layer to the other (see FIG. 3).
Comparative example 1: an asphalt concrete for road and bridge construction, which is different from the embodiment 1: the cellulose consists of steel fibers and PET fibers, wherein the steel fibers and the PET fibers are in a dispersed state and are mixed according to the weight ratio of 1: 3.
comparative example 2: an asphalt concrete for road and bridge construction, which is different from the embodiment 1: the cellulose consists of steel fibers and PET fibers, wherein the steel fibers and the PET fibers are in a dispersed state and are mixed according to the weight ratio of 1: 1.
comparative example 3: an asphalt concrete for road and bridge construction, which is different from the embodiment 1: the cellulose consists of steel fibers and PET fibers, wherein the steel fibers and the PET fibers are in a dispersed state, and the weight ratio of the steel fibers to the PET fibers is 3: 1.
comparative example 4: an asphalt concrete for road and bridge construction, which is different from the embodiment 1: the cellulose was all PET fiber.
Comparative example 5: an asphalt concrete for road and bridge construction, which is different from the embodiment 1: the cellulose is all steel fiber.
Concrete samples were prepared according to the formulations and methods of examples 1-5 and comparative examples 1-3, and the main components of the anti-crack test mold included a base, a side mold, a core mold and an upper cover; the core mold is made of steel and the other parts are made of organic glass. The sample was circular, and had an inner diameter of 90mm, an outer diameter of 305mm and a height of 100 mm.
Opening the upper cover of the anti-cracking test mold, loading the prepared concrete mixture into the anti-cracking test mold in two layers by using a small shovel, wherein the loading thickness of each layer is approximately equal, uniformly inserting and tamping by using a tamping bar, the inserting and tamping times are at least not less than 12 times per 10000 square centimeters, and the tamping bar is required to reach the bottom of the test mold when the bottom layer is inserted and tamped; when the upper layer is inserted and pounded, the pounding rod penetrates through the upper layer and then is inserted into the lower layer for 20-30 mm; the tamping rod should be vertical during tamping, and should not be inclined. The test mold has no any air bubbles, and the upper opening is added along with the gap until the test mold is level and strickled.
And placing the formed anti-crack test mold into an environment with the temperature of 20 +/-2 ℃ for curing for 24h, and then removing the mold. Immediately placing the anti-cracking test piece after the mold is removed into an environment with the temperature of 30 +/-2 ℃ and the relative humidity of (50 +/-5)% and coating silica gel on the top surface of the test piece for sealing treatment. Whether cracks are generated on the vertical surface of the ring is observed by using a strain gauge or a magnifying glass, and the generation time of the cracks is recorded (10 samples are selected in each group, and the average value is taken).
| Time of crack initiation (second) | |
| Example 1 | 42.3 |
| Example 2 | 42.4 |
| Example 3 | 41.8 |
| Example 4 | 35.2 |
| Example 5 | 35.8 |
| Comparative example 1 | 20.7 |
| Comparative example 2 | 21.4 |
| Comparative example 3 | 20.6 |
| Comparative example 4 | 21.3 |
| Comparative example 5 | 22.6 |
The experiment shows that the whole crack resistance of the concrete is improved by combining the steel fibers and the PET fibers.
Claims (5)
1. The asphalt concrete for road and bridge construction is characterized by comprising the following components in parts by weight:
120 portions of asphalt and 125 portions of;
35-40 parts of fly ash;
30-40 parts of quartz sand;
38-45 parts of macadam;
4-6 parts of a water reducing agent;
7-10 parts of a coagulation regulator;
0.3-0.5 part of emulsifier;
0.2 part of defoaming agent;
5-7 parts of cellulose;
the cellulose consists of fiber monomers, the fiber monomers consist of steel fibers and a plurality of PET fibers which are bonded at the tail ends of the steel fibers and are in a cluster shape, and at least one part of the PET fibers are different in length; the lengths of the PET fibers are symmetrically and gradually arranged from the middle PET fiber to two sides in a stepped mode;
the longest length ratio of the steel fibers and the PET fibers is 3:1, and the shortest length ratio of the steel fibers and the PET fibers is 15: 2.
2. The asphalt concrete for road and bridge construction according to claim 1, wherein: the coagulation regulator is sodium sulfate.
3. The asphalt concrete for road and bridge construction according to claim 1, wherein: the water reducing agent is a polycarboxylic acid water reducing agent.
4. The asphalt concrete for road and bridge construction according to claim 1, wherein: the emulsifier is dodecyl ammonium chloride.
5. The asphalt concrete for road and bridge construction according to claim 1, wherein: the defoaming agent is a polyether defoaming agent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811580633.9A CN109455982B (en) | 2018-12-24 | 2018-12-24 | Asphalt concrete for road and bridge construction and preparation method thereof |
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| CN201811580633.9A CN109455982B (en) | 2018-12-24 | 2018-12-24 | Asphalt concrete for road and bridge construction and preparation method thereof |
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| CN109455982A CN109455982A (en) | 2019-03-12 |
| CN109455982B true CN109455982B (en) | 2021-09-03 |
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| CN113563019A (en) * | 2020-04-29 | 2021-10-29 | 淮安鑫塬铭新材料有限公司 | Polyester concrete prefabricated cover plate |
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| CN101215123A (en) * | 2008-01-02 | 2008-07-09 | 武汉理工大学 | Multi-component fibre composite asphalt concrete and preparing method thereof |
| CN101821448A (en) * | 2007-07-27 | 2010-09-01 | 道康宁公司 | Fiber structure and method of making same |
| CN102733283A (en) * | 2012-07-09 | 2012-10-17 | 科达集团股份有限公司 | Application of strip-shaped soil engineering fiber and preparation method for fiber asphalt concrete |
| CN102745946A (en) * | 2012-08-03 | 2012-10-24 | 重庆市智翔铺道技术工程有限公司 | Asphalt pavement material and preparation method thereof |
| CN102786258A (en) * | 2012-08-31 | 2012-11-21 | 郑州大学 | Crack self-healing bituminous concrete and preparation method thereof |
| KR101256833B1 (en) * | 2012-10-31 | 2013-04-23 | 하나케이텍(주) | Cold asphalt mixture using waste asphalt mixture and pavement structure with it |
| CN108558271A (en) * | 2018-05-21 | 2018-09-21 | 卢莺莺 | A kind of construction of the highway bituminous concrete and preparation method thereof |
-
2018
- 2018-12-24 CN CN201811580633.9A patent/CN109455982B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101821448A (en) * | 2007-07-27 | 2010-09-01 | 道康宁公司 | Fiber structure and method of making same |
| CN101215123A (en) * | 2008-01-02 | 2008-07-09 | 武汉理工大学 | Multi-component fibre composite asphalt concrete and preparing method thereof |
| CN102733283A (en) * | 2012-07-09 | 2012-10-17 | 科达集团股份有限公司 | Application of strip-shaped soil engineering fiber and preparation method for fiber asphalt concrete |
| CN102745946A (en) * | 2012-08-03 | 2012-10-24 | 重庆市智翔铺道技术工程有限公司 | Asphalt pavement material and preparation method thereof |
| CN102786258A (en) * | 2012-08-31 | 2012-11-21 | 郑州大学 | Crack self-healing bituminous concrete and preparation method thereof |
| KR101256833B1 (en) * | 2012-10-31 | 2013-04-23 | 하나케이텍(주) | Cold asphalt mixture using waste asphalt mixture and pavement structure with it |
| CN108558271A (en) * | 2018-05-21 | 2018-09-21 | 卢莺莺 | A kind of construction of the highway bituminous concrete and preparation method thereof |
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