CN115974464A - Anti-cracking ballastless track bed plate concrete and preparation method thereof - Google Patents
Anti-cracking ballastless track bed plate concrete and preparation method thereof Download PDFInfo
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- CN115974464A CN115974464A CN202211541110.XA CN202211541110A CN115974464A CN 115974464 A CN115974464 A CN 115974464A CN 202211541110 A CN202211541110 A CN 202211541110A CN 115974464 A CN115974464 A CN 115974464A
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- ballastless track
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- 238000005336 cracking Methods 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000004568 cement Substances 0.000 claims abstract description 23
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 17
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 11
- 239000010881 fly ash Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000002253 acid Substances 0.000 claims abstract description 3
- 238000012360 testing method Methods 0.000 claims description 23
- 230000008569 process Effects 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 239000010754 BS 2869 Class F Substances 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 12
- 238000001035 drying Methods 0.000 description 11
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 4
- 230000008439 repair process Effects 0.000 description 4
- 238000011056 performance test Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000008030 superplasticizer Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention provides anti-cracking ballastless track bed plate concrete and a preparation method thereof, wherein the concrete comprises the following raw material components in percentage by mass: 9.0 to 10.0 percent of cement, 0.5 to 1.0 percent of magnesia expanding agent, 0.1 to 0.3 percent of shrinkage reducing agent, 6.0 to 7.0 percent of fly ash, 48.0 to 49.0 percent of coarse aggregate, 29.0 to 30.0 percent of fine aggregate, 0.05 to 0.1 percent of polycarboxylic acid water reducing agent and 5.2 to 5.5 percent of water; the cement is low-heat cement. The preparation method comprises the steps of preparing premix, and curing to obtain the anti-cracking ballastless track bed plate concrete. The method can delay the initial cracking time of the concrete of the ballast bed plate and improve the crack resistance of the concrete of the ballast bed plate.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to anti-cracking ballastless track bed plate concrete and a preparation method thereof.
Background
The ballastless track has become the main structure of the high-speed railway track in China due to the obvious characteristics of good integrity, stable structure, good economy and the like. Ballastless track structures are typically comprised of steel rails, fasteners, sleepers, track bed slab concrete, concrete support layers, and the like. However, as a structure that is placed in the open air and repeatedly bears the load of a train, the ballastless track is likely to cause cracks in the concrete of the track bed slab under the influence of the load of the train, temperature change, foundation deformation, and drying shrinkage deformation of the concrete itself. Corrosive media (chloride, sulfate and the like) enter the interior of the track bed plate concrete through the cracks, so that the durability of the track bed plate concrete is further reduced, the performances of the track bed plate concrete are further degraded, and the service safety and the service life of the ballastless track are seriously influenced.
Because the factors influencing the concrete cracking of the ballast bed plate are many, even if a plurality of measures are taken in design and construction, the problem of concrete cracking of the ballast bed plate cannot be thoroughly solved. Therefore, the problem that needs to be solved by the technical personnel in the field is how to improve the crack resistance of the concrete of the ballast bed slab from the composition and the proportion of the concrete.
Disclosure of Invention
The invention aims to provide anti-cracking ballastless track bed plate concrete and a preparation method thereof, which are used for improving the anti-cracking performance of the track bed plate concrete. The specific technical scheme is as follows:
in a first aspect, the invention provides anti-cracking ballastless track bed plate concrete, which comprises the following raw material components in percentage by mass:
9.0 to 10.0 percent of cement, 0.5 to 1.0 percent of magnesia expanding agent, 0.1 to 0.3 percent of shrinkage reducing agent, 6.0 to 7.0 percent of fly ash, 48.0 to 49.0 percent of coarse aggregate, 29.0 to 30.0 percent of fine aggregate, 0.05 to 0.1 percent of polycarboxylic acid water reducing agent and 5.2 to 5.5 percent of water; the cement is low-heat cement.
Optionally, the shrinkage reducing agent is a CHUPPLJ100 type shrinkage reducing agent.
Optionally, the low-heat cement is 42.5-grade low-heat cement.
Optionally, the fly ash is class F class II fly ash.
Optionally, the coarse aggregate comprises macadam, and the mud content is not more than 1%.
Optionally, the particle size of the Zhongtai gravel is 5-20mm.
Optionally, the fine aggregate comprises at least one of Minhou river sand and Mitsu, and the mud content is not more than 2.5%.
In a second aspect, the invention provides a preparation method for preparing the concrete for the anti-cracking ballastless track bed plate, which comprises the following steps:
step S1, adding the raw material components with required dosage into a stirrer to be uniformly stirred to prepare a premix;
s2, pouring the premix into a mold, uniformly vibrating by a vibrating machine, and opening the mold after the premix is maintained for the first time in the mold to obtain a molded test piece; and curing the molded test piece for the second time to obtain the concrete for the anti-cracking ballastless track bed plate.
Optionally, in step S2, the first curing process conditions include a temperature of 20 ℃ ± 2 ℃, a relative humidity of 95% ± 4%, and a curing time of 1-2 days; the process conditions of the second curing are that the temperature is 20 +/-2 ℃, the relative humidity is 95 +/-4 percent, and the curing time is 28 days; and the second curing is completed in the curing chamber.
Optionally, the vibration frequency of the vibration machine adopted in the step S2 is 2800-3000 times/min; the stirring speed of the stirrer used in step S1 is 45 to 50 rpm.
The technical scheme of the invention at least has the following beneficial effects:
(1) According to the anti-cracking ballastless track bed plate concrete, the hydration heat release generated by low-heat cement is far lower than that of common portland cement and medium-heat cement, so that the drying shrinkage deformation of the track bed plate concrete can be effectively inhibited, and the anti-cracking performance of the track bed plate concrete is improved; however, the use of low-heat cement can cause the problems that the early tensile strength of the concrete of the ballast bed slab is low and early cracks are easy to occur; therefore, the invention adopts the magnesium oxide expanding agent to repair the early cracks, and particularly, the magnesium oxide expanding agent absorbs water to generate enough expansion stress to repair the early cracks; the shrinkage reducing agent is adopted, so that the surface tension of a track bed plate concrete pore solution can be reduced, and the drying shrinkage deformation of the track bed plate concrete is inhibited; in addition, the shrinkage reducing agent can delay the hydration process of cement, reduce the evaporation of capillary solution and have a certain water retention effect, so that sufficient water is provided for the magnesium oxide expanding agent to expand and repair cracks. Therefore, the invention adopts the combination of the low-heat cement, the magnesium oxide expanding agent and the shrinkage reducing agent, can effectively inhibit the drying shrinkage deformation of the concrete of the ballast bed plate, repair the early cracks to delay the initial cracking time of the concrete of the ballast bed plate and improve the crack resistance of the concrete of the ballast bed plate.
(2) The preparation method of the anti-cracking ballastless track bed plate concrete has the advantages of simplified steps, simplicity and convenience in operation and easiness in parameter control, and the prepared anti-cracking ballastless track bed plate concrete has the drying shrinkage deformation as low as 138.78 multiplied by 10 under the dry state -6 The initial cracking time was delayed to 95.20h.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the embodiments of the present invention, and it should be apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
Example 1:
the anti-cracking ballastless track bed plate concrete comprises the following raw material components in percentage by mass:
9.4 percent of 42.5-grade low-heat cement, 0.6 percent of magnesia expanding agent and a CHUPPLJ100 type shrinkage reducing agent (light yellow liquid with the density of 1.01 +/-0.02 g/cm) 3 The main components of the material are polyether derivatives, the solid content is more than or equal to 99 percent) 0.1 percent, the fly ash is 6.2 percent, the coarse aggregate is 48.5 percent, the fine aggregate is 29.7 percent, the polycarboxylate superplasticizer is 0.1 percent, and the water is 5.4 percent.
The fly ash is F-class II-grade fly ash.
The coarse aggregate is the macadam, and the mud content is not more than 1%.
The particle size of the Zhongtai gravel is 5-20mm.
The fine aggregate is Minhou Miyao, and the mud content is not more than 2.5%.
A preparation method for preparing the anti-cracking ballastless track bed plate concrete comprises the following steps:
step S1, adding the raw material components with required dosage into a stirrer, and uniformly stirring to prepare a premix;
s2, pouring the premix into a mold, uniformly vibrating by a vibrating machine, and opening the mold after first curing of the premix in the mold to obtain a molded test piece; and curing the molded test piece for the second time to obtain the concrete for the anti-cracking ballastless track bed plate.
In the step S2, the first curing process conditions are that the temperature is 20 +/-2 ℃, the relative humidity is 95 +/-4%, and the curing time is 1 day; the process conditions of the second curing are that the temperature is 20 +/-2 ℃, the relative humidity is 95 +/-4 percent, and the curing time is 28 days; and the second curing is completed in the curing chamber.
The vibration frequency of the vibrator adopted in the step S2 is 2860 times/minute; the stirring rate of the stirrer used in step S1 was 48 rpm.
On the basis of the embodiment 1, the invention also provides embodiments 2-9 and comparative examples 1-8 by surrounding the raw material components and the component dosage adopted for preparing the anti-cracking ballastless track bed plate concrete. The specific differences between examples 1 to 9 and comparative examples 1 to 8 are shown in Table 1.
Table 1 conditions of raw material components and amounts of components used for preparing the concrete for the track bed slab of the anti-crack ballastless track adopted in examples 1 to 9 and comparative examples 1 to 8
The raw material components adopted in the examples 1 to 9 and the comparative examples 1 to 8 are prepared into the molded test pieces according to the corresponding dosage proportion, and the molded test pieces are respectively subjected to the following performance tests:
1) And (3) testing the compressive strength: respectively manufacturing the molded test pieces into samples with the same shape and the same size, and completing the second maintenance of the samples; and then testing according to GB/T50081-2019 test method Standard for physical and mechanical Properties of concrete. Wherein, the higher the compressive strength is, the better the crack resistance of the concrete is.
2) And (3) testing the splitting tensile strength: respectively manufacturing the molded test pieces into samples with the same shape and the same size, and finishing the secondary maintenance of the samples; and then testing according to GB/T50081-2019 concrete physical and mechanical property test method Standard. Wherein, the higher the splitting tensile strength is, the better the anti-cracking performance of the concrete is.
3) And (3) testing the elastic modulus: respectively manufacturing the molded test pieces into samples with the same shape and the same size, and finishing the secondary maintenance of the samples; and then testing according to GB/T50081-2019 test method Standard for physical and mechanical Properties of concrete. Wherein, the lower the elastic modulus, the better the crack resistance of the concrete.
4) Drying shrinkage deformation test: respectively manufacturing the molded test pieces into samples with the same shape and the same size, and finishing the secondary maintenance of the samples; and then testing according to GB/T50082-2009 Standard test method for long-term performance and durability of common concrete. Wherein, the lower the drying shrinkage deformation, the better the crack resistance of the concrete.
5) Initial cracking time test: respectively manufacturing the molded test pieces into samples with the same shape and the same size; then, the test was carried out according to CCES01-2004 "guide for designing and constructing concrete Structure durability". Wherein, the longer the initial cracking time of the concrete, the better the crack resistance of the concrete.
The results of the above performance tests are shown in table 2.
Table 2 concrete performance test conditions of each of the crack-resistant ballastless track slabs prepared in examples 1 to 9 and comparative examples 1 to 8
As is clear from the data in Table 2:
compared with the comparative example 1, the comparative example 2 adopts low-heat cement, so that the initial cracking time can be delayed to a certain extent, and the drying shrinkage deformation is reduced;
compared with comparative example 2, comparative examples 3 to 5 are based on the adoption of low-heat cement, the combined use of different amounts of the magnesium oxide expanding agent can further delay the initial cracking time and reduce the drying shrinkage deformation; wherein, when the dosage of the magnesium oxide expanding agent is 0.8%, the initial cracking delay time is longest;
compared with the comparative example 2, the comparative examples 6 to 8 can further delay the initial cracking time and reduce the drying shrinkage deformation by using different amounts of the CHUPPL J100 type shrinkage reducing agent in combination on the basis of adopting low-heat cement; wherein, when the consumption of the CHUPPLJ100 type shrinkage reducing agent is 0.2 percent, the initial cracking delay time is longest;
compared with comparative examples 1 to 8, the anti-crack ballastless track bed plate concrete prepared by using the low-heat cement, the magnesium oxide expanding agent and the CHUPPL J100 type shrinkage reducing agent in the embodiments 1 to 9 can effectively delay the initial cracking time and reduce the drying shrinkage deformation, thereby improving the anti-crack performance of the track bed plate concrete.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The anti-cracking ballastless track bed plate concrete is characterized by comprising the following raw material components in percentage by mass:
9.0 to 10.0 percent of cement, 0.5 to 1.0 percent of magnesia expanding agent, 0.1 to 0.3 percent of shrinkage reducing agent, 6.0 to 7.0 percent of fly ash, 48.0 to 49.0 percent of coarse aggregate, 29.0 to 30.0 percent of fine aggregate, 0.05 to 0.1 percent of polycarboxylic acid water reducing agent and 5.2 to 5.5 percent of water; the cement is low-heat cement.
2. The crack-resistant ballastless track bed plate concrete of claim 1, wherein the shrinkage-reducing agent is a CHUPPLJ100 type shrinkage-reducing agent.
3. The crack-resistant ballastless track bed plate concrete of claim 1, wherein the low-heat cement is 42.5 grade low-heat cement.
4. The crack-resistant ballastless track bed plate concrete of claim 1, wherein the fly ash is class F class II fly ash.
5. The crack-resistant ballastless track bed plate concrete of claim 1, wherein the coarse aggregate comprises macadam, and the mud content is not more than 1%.
6. The crack-resistant ballastless track bed plate concrete according to claim 5, wherein the medium tay macadam has a particle size of 5-20mm.
7. The anti-cracking ballastless track bed plate concrete of claim 1, wherein the fine aggregate comprises at least one of Minhou river sand and medium sand, and the mud content is not more than 2.5%.
8. The preparation method for preparing the concrete for the crack-resistant ballastless track bed plate of any one of claims 1-7, is characterized by comprising the following steps:
step S1, adding the raw material components with required dosage into a stirrer, and uniformly stirring to prepare a premix;
s2, pouring the premix into a mold, uniformly vibrating by a vibrating machine, and opening the mold after first curing of the premix in the mold to obtain a molded test piece; and curing the molded test piece for the second time to obtain the anti-cracking ballastless track bed plate concrete.
9. The preparation method of the anti-cracking ballastless track bed plate concrete according to claim 8, wherein in the step S2, the first curing process is carried out under the conditions that the temperature is 20 +/-2 ℃, the relative humidity is 95 +/-4%, and the curing time is 1-2 days; the technological conditions of the second curing are that the temperature is 20 +/-2 ℃, the relative humidity is 95 +/-4 percent, and the curing time is 28 days; and the second curing is completed in the curing chamber.
10. The preparation method of the anti-cracking ballastless track bed plate concrete according to claim 8, wherein the vibration frequency of a vibrator adopted in the step S2 is 2800 to 3000 times/min; the stirring rate of the stirrer used in step S1 is 45 to 50 rpm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211541110.XA CN115974464A (en) | 2022-12-02 | 2022-12-02 | Anti-cracking ballastless track bed plate concrete and preparation method thereof |
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| CN202211541110.XA CN115974464A (en) | 2022-12-02 | 2022-12-02 | Anti-cracking ballastless track bed plate concrete and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109384429A (en) * | 2018-09-20 | 2019-02-26 | 国家电网有限公司 | A kind of freeze proof anti-crack concrete and its preparation method and application |
| CN111825370A (en) * | 2020-07-13 | 2020-10-27 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Concrete slump-retaining anti-cracking material for ballastless track base and preparation method thereof |
| CN112694299A (en) * | 2021-01-29 | 2021-04-23 | 中铁二院工程集团有限责任公司 | High-crack-resistance concrete for plateau environment and preparation method thereof |
| CN115108789A (en) * | 2022-05-25 | 2022-09-27 | 保利长大工程有限公司 | High-strength anti-crack marine large-volume concrete |
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2022
- 2022-12-02 CN CN202211541110.XA patent/CN115974464A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109384429A (en) * | 2018-09-20 | 2019-02-26 | 国家电网有限公司 | A kind of freeze proof anti-crack concrete and its preparation method and application |
| CN111825370A (en) * | 2020-07-13 | 2020-10-27 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Concrete slump-retaining anti-cracking material for ballastless track base and preparation method thereof |
| CN112694299A (en) * | 2021-01-29 | 2021-04-23 | 中铁二院工程集团有限责任公司 | High-crack-resistance concrete for plateau environment and preparation method thereof |
| CN115108789A (en) * | 2022-05-25 | 2022-09-27 | 保利长大工程有限公司 | High-strength anti-crack marine large-volume concrete |
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