CN116003074A - High-ductility waste incineration fly ash-cement composite-based rapid repair material and preparation method thereof - Google Patents
High-ductility waste incineration fly ash-cement composite-based rapid repair material and preparation method thereof Download PDFInfo
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- CN116003074A CN116003074A CN202310022412.4A CN202310022412A CN116003074A CN 116003074 A CN116003074 A CN 116003074A CN 202310022412 A CN202310022412 A CN 202310022412A CN 116003074 A CN116003074 A CN 116003074A
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- 239000000463 material Substances 0.000 title claims abstract description 57
- 238000004056 waste incineration Methods 0.000 title claims abstract description 49
- 239000002131 composite material Substances 0.000 title claims abstract description 48
- 230000008439 repair process Effects 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims description 21
- 239000010881 fly ash Substances 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
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- 239000003795 chemical substances by application Substances 0.000 claims abstract description 26
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- 238000000034 method Methods 0.000 claims abstract description 10
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- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 6
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 6
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
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- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 4
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical compound [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 claims description 3
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- 229910001385 heavy metal Inorganic materials 0.000 abstract description 14
- 150000002500 ions Chemical class 0.000 abstract description 11
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- 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 relates to the field of recycling application of hazardous wastes in novel building materials, in particular to a high-ductility waste incineration fly ash-cement composite-based rapid repair material; the material comprises the following raw materials in parts by mass: 496-992 parts of sulphoaluminate cement, 124-248 parts of waste incineration fly ash, 0-620 parts of fly ash, 372-496 parts of fine aggregate, 39-74 parts of alkali-activator, 6-10 parts of water reducer, 12-62 parts of early strength agent, 0-99 parts of accelerator, 281-352 parts of water and 13-26 parts of fiber. The high-ductility waste incineration fly ash-cement composite-based rapid repair material prepared by the invention integrates high ductility, rapid hardening and high strength, is used for rapid repair of road bridge deck pavement layers, reduces traffic blocking time, and can avoid cracking risks caused by poor tensile deformation capacity of the road bridge deck cement-based material; on the other hand, the heavy metal ions in the hazardous waste are solidified, the harm to human beings and the environment is reduced, and the method has outstanding technical, economic and environmental benefits.
Description
Technical Field
The invention relates to the field of recycling application of hazardous wastes in novel building materials, in particular to a high-ductility waste incineration fly ash-cement composite-based rapid repair material and a preparation method thereof.
Background
Asphalt concrete is mostly adopted in road bridge deck pavement layers in China, the tensile deformation capacity of the asphalt concrete is poor, and the concrete pavement layers can be cracked and damaged to different degrees under the comprehensive actions of factors such as temperature difference, shrinkage, vehicle load and the like. On one hand, harmful ions in rainwater are caused to infiltrate into lower structures such as reinforced concrete girders of the bridge and the like to influence the service life of the bridge; on the other hand, the driving comfort and the appearance of the road deck are seriously affected. The preparation of the cement-based composite material which integrates high ductility, is rapid and hard and meets the strength grade requirement of the concrete pavement layer is important for early traffic opening, reduction of cracking risk of the road bridge pavement layer, improvement of passenger-cargo transportation benefit and even improvement of service life of the bridge.
Fly ash is fine particles generated in the garbage incineration process, contains organic pollutants such as dioxin and the like and heavy metals such as Cu, zn, pb, cd, as, cr and Hg and the like, is listed as HW18 dangerous waste by China, is extremely easy to cause the teratogenesis and the carcinogenesis of organisms, and seriously threatens the safety of human beings. At present, two main treatment modes for the waste incineration fly ash are available, namely a fixed stabilization technology and a resource utilization technology. The solidification technology mainly stabilizes heavy metals in fly ash through cement hydration, active material hydration, mechanical grinding and the like; the main component of fly ash is CaO and Al 2 O 3 、SiO 2 、Fe 2 O 3 And the like, is similar to the components such as cement, fly ash and the like, and can reasonably utilize the fly ash to prepare concrete, roadbed materials and the like. The method has the advantages that the technology of curing the fly ash and recycling the resources is comprehensively considered, waste is changed into valuable, the alkali-activated fly ash is used for partially replacing the sulphoaluminate cement, and the waste incineration fly ash-cement composite-based rapid repair material is prepared, so that not only can the heavy metal ions in the fly ash hazardous waste be cured, but also the concrete road and bridge deck can be repaired by adopting the material, and the rapid development of road and bridge industry is promoted.
The high-ductility cement-based composite material is prepared by adding fiber into a cement-based material matrix, and regulating microscopic properties to ensure that the ultimate elongation of the composite material is not less than 0.5% under uniaxial tensile property, and the average crack width is not more than 200 mu m. Referring to the microscopic design theory of the high-ductility cement-based composite material, the high-ductility waste incineration fly ash-cement-based rapid repair material is prepared by adopting a waste incineration fly ash-cement composite matrix and doping fibers, and is used for rapid repair of a road and bridge surface concrete pavement layer.
At present, the main mode of quick repair of a concrete pavement layer is that quick hardening concrete is adopted, but the tensile deformation capability is poor, the pavement layer is easy to crack under the comprehensive actions of temperature difference, vehicle load and the like after being repaired, and the symptoms and the root causes are cured; the curing age of the high-ductility cement-based composite material is generally 28 days, and the high-ductility cement-based composite material cannot be directly used in the field of quick repair. The fly ash-cement composite material is used as a matrix, and the fly ash-cement composite quick repair material meets the strength criterion and the energy criterion in the high ductility criterion through the multi-scale interactive design of micromechanics, micromechanics and macrosechanics layers, so that the high-ductility fly ash-cement composite quick repair material integrating the advantages of the quick hardening cement-based material and the high ductility cement-based composite material is prepared, but the research and the report on the aspect are rare.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides a high-ductility waste incineration fly ash-cement composite-based rapid repair material. The composite base of the alkali-activated waste incineration fly ash and cement is used as a cementing material, fly ash, fine aggregate, a water reducing agent, an early strength agent, an accelerator and the like are doped to prepare a matrix, and a proper amount of fiber is doped to ensure that the material reaches high ductility and rapid hardening and meets the strength grade requirement of a road bridge deck concrete pavement layer through microscopic performance regulation and micro, fine and macro multi-scale interactive design, and heavy metal ions in the fly ash meet the landfill requirement, so that the method provides a technical scheme for rapid repair of the road bridge deck concrete pavement layer, provides a recycling utilization mode for the hazardous waste fly ash, and can solidify heavy metal ions in the hazardous waste.
In order to solve the technical problems, the invention adopts the following technical scheme: the high-ductility waste incineration fly ash-cement composite-based rapid repair material comprises the following raw materials in parts by mass: 496-992 parts of sulphoaluminate cement, 124-248 parts of waste incineration fly ash, 0-620 parts of fly ash, 372-496 parts of fine aggregate, 39-74 parts of alkali-activator, 6-10 parts of water reducer, 12-62 parts of early strength agent, 0-99 parts of accelerator, 281-352 parts of water and 13-26 parts of fiber.
Further, the fine aggregate is one or a combination of river sand and quartz sand, the grain diameter is 0.06-1.18 mm, and the fineness modulus is 1.20-1.71.
Further, the alkali-activated agent is one or a combination of sodium hydroxide and sodium silicate.
Further, the early strength agent is one of calcium formate, anhydrous sodium sulfate and lithium carbonate; or a combination of anhydrous sodium sulfate and lithium carbonate.
Further, the fiber has a diameter of 20-40 μm, a length of 6-12 mm, an elastic modulus of 28-35 GPa, a tensile strength of at least 1000MPa, and an ultimate elongation of 8-12%.
Further, the fibers are one or more of polyvinyl alcohol fibers, basalt fibers and polypropylene fibers.
In addition, the invention also provides a preparation method of the high-ductility waste incineration fly ash-cement composite-based rapid repair material, which comprises the following steps:
(1) The method comprises the steps of (1/3) mixing waste incineration fly ash, an alkali excitant and 1/3-1/2 of total water in a mixer at a rotation speed of 140 rpm and a revolution speed of 62 rpm for 1-2 minutes;
(2) Adding sulphoaluminate cement, fly ash, a water reducing agent, an accelerator, an early strength agent and fine aggregate into a stirrer at a rotation speed of 140 rpm and a revolution speed of 62 rpm, and stirring for 1-2 minutes;
(3) Adding the rest water, stirring for 2-4 minutes at the rotation speed of 285 rpm and the revolution speed of 125 rpm;
(4) Adding fiber, stirring for 1-2 minutes at the rotation speed of 285 rpm and the revolution speed of 125 rpm;
(5) And (5) die filling, curing in a standard curing box for 12-24 hours, and then die stripping.
Furthermore, the preparation method of the high-ductility waste incineration fly ash-cement composite-based rapid repair material controls the whole preparation process of the material to be 5-10 minutes.
Compared with the prior art, the invention has the following beneficial effects:
the traditional rapid repairing method for the concrete pavement layer adopts concrete with the same strength grade or higher strength grade, and can not solve the cracking problem from the material performance perspective; heavy metal ions in the common cement hydration solidified waste incineration fly ash hazardous waste are not related to the resource utilization of the fly ash in the application field of materials. The high-ductility waste incineration fly ash-cement composite-based rapid repair material has excellent tensile deformation capacity, is used in the field of road and bridge deck concrete repair, can reduce the risk of cracking, reduce the maintenance times, open traffic as early as possible in repair, prolong the service life of roads and bridges, and improve the driving comfort; the method can solidify heavy metal ions while recycling the hazardous fly ash wastes in the repairing field, so as to avoid the harm of the heavy metal ions to human beings. The preparation of the high-ductility waste incineration fly ash-cement composite-based rapid repair material has outstanding economic benefit, social benefit and ecological benefit.
Drawings
FIG. 1 is a uniaxial tensile stress-strain plot of the high-ductility waste incineration fly ash-cement composite-based rapid repair material of example 1;
FIG. 2 is a uniaxial tensile stress-strain plot of the high-ductility waste incineration fly ash-cement composite-based rapid repair material of example 2;
FIG. 3 is a uniaxial tensile stress-strain plot of the high-ductility waste incineration fly ash-cement composite-based rapid repair material of example 3;
FIG. 4 is a uniaxial tensile stress-strain plot of the high-ductility waste incineration fly ash-cement composite-based rapid repair material of example 4.
Detailed Description
The invention is further illustrated below with reference to specific examples.
Example 1
The high-ductility waste incineration fly ash-cement composite-based rapid repair material is matched with the following components in table 1:
TABLE 1 Material mix ratio (mass part ratio)
| Cement and its preparation method | Fly ash | Fly ash | Fine aggregate | Alkali-activated agent | Water reducing agent | Early strength agent | Water and its preparation method | Fiber |
| 496 | 124 | 620 | 372 | 39 | 6 | 12 | 352 | 26 |
The fine aggregate is river sand, the grain diameter is 0.06-1.18 mm, and the fineness modulus is 1.71; the alkali activator is sodium hydroxide, the early strength agent is anhydrous sodium sulfate, the fiber is polyvinyl alcohol fiber, and the length is 12mm.
The preparation method comprises the following steps:
(1) Quick stirring the waste incineration fly ash, an alkali excitant and water (1/3 of the total water consumption) in a stirrer (the rotation speed is 140 rpm, and the revolution speed is 62 rpm) for 1 minute;
(2) Adding sulphoaluminate cement, fly ash, a water reducing agent, an early strength agent and fine aggregate, and stirring for 2 minutes at a low speed (the rotation speed is 140 rpm and the revolution speed is 62 rpm);
(3) Adding the rest water and stirring for 4 minutes rapidly (the rotation speed is 285 rpm and the revolution speed is 125 rpm);
(4) Adding fiber and stirring for 2 min rapidly (the rotation speed is 285 rpm and the revolution speed is 125 rpm);
(5) And (5) die filling, curing in a standard curing box for 24 hours, removing the die, and testing the mechanical properties.
Example 2
The high-ductility waste incineration fly ash-cement composite-based rapid repair material is matched with the following components in table 2:
table 2 Material mixing proportion (mass portion ratio)
| Cement and its preparation method | Fly ash | Fly ash | Fine aggregate | Alkali-activated agent | Water reducing agent | Early strength agent | Water and its preparation method | Fiber |
| 595 | 149 | 496 | 372 | 45 | 6 | 37 | 348 | 20 |
The fine aggregate is quartz sand, the grain diameter is 0.06-0.6 mm, and the fineness modulus is 1.20; the alkali excitant is water glass, the early strength agent is calcium formate, the fiber is basalt fiber, and the length is 8mm.
The preparation method comprises the following steps:
(1) The waste incineration fly ash, the alkali excitant and water (1/2 of the total water consumption) are rapidly stirred in a stirrer (the rotation speed is 140 rpm, and the revolution speed is 62 rpm) for 2 minutes;
(2) Adding sulphoaluminate cement, fly ash, a water reducing agent, an early strength agent and fine aggregate, and stirring for 2 minutes at a low speed (the rotation speed is 140 rpm and the revolution speed is 62 rpm);
(3) Adding the rest water and stirring for 3 min rapidly (rotation speed is 285 rpm and revolution speed is 125 rpm);
(4) Adding fiber and stirring for 2 min rapidly (the rotation speed is 285 rpm and the revolution speed is 125 rpm);
(5) And (5) die filling, curing in a standard curing box for 20 hours, removing the die, and testing the mechanical properties.
Example 3
The high-ductility waste incineration fly ash-cement composite-based rapid repair material is matched with the following components in table 3:
TABLE 3 Material mix ratio (mass part ratio)
| Cement and its preparation method | Fly ash | Fine aggregate | Alkali-activated agent | Water reducing agent | Early strength agent | Accelerating agent | Water and its preparation method | Fiber |
| 992 | 248 | 496 | 74 | 10 | 62 | 62 | 281 | 26 |
The fine aggregate is mixed by river sand and quartz sand, the grain diameter is 0.06-1.18 mm, and the fineness modulus is 1.43; the alkali excitant is water glass, the early strength agent is lithium carbonate, the fiber is a composite of polyvinyl alcohol fiber and basalt fiber, and the length is 12mm.
The preparation method comprises the following steps:
(1) The waste incineration fly ash, the alkali excitant and water (1/3 of the total water consumption) are rapidly stirred in a stirrer (the rotation speed is 140 rpm, and the revolution speed is 62 rpm) for 2 minutes;
(2) Adding sulphoaluminate cement, fine aggregate, a water reducing agent, an early strength agent and an accelerator, and stirring for 2 minutes at a low speed (the rotation speed is 140 rpm and the revolution speed is 62 rpm);
(3) Adding the rest water and stirring for 2 min rapidly (rotation speed is 285 rpm and revolution speed is 125 rpm);
(4) Adding fiber and stirring for 2 min rapidly (the rotation speed is 285 rpm and the revolution speed is 125 rpm);
(5) And (5) die filling, curing in a standard curing box for 12 hours, removing the die, and testing the mechanical properties.
Example 4
The high-ductility waste incineration fly ash-cement composite-based rapid repair material is matched with the following components in table 4:
table 4 Material mix ratio (mass part ratio)
| Cement and its preparation method | Fly ash | Fly ash | Fine aggregate | Alkali-activated agent | Water reducing agent | Early strength agent | Water and its preparation method | Fiber |
| 496 | 124 | 620 | 372 | 44 | 6 | 37 | 352 | 13 |
The fine aggregate is river sand, the grain diameter is 0.06-1.18 mm, and the fineness modulus is 1.71; the alkali activator is the complex mixing of sodium hydroxide and sodium silicate, the early strength agent is the complex mixing of lithium carbonate and anhydrous sodium sulfate, the fiber is polypropylene fiber, and the length is 6mm.
The preparation method comprises the following steps:
(1) The waste incineration fly ash, the alkali excitant and water (1/3 of the total water consumption) are rapidly stirred in a stirrer (the rotation speed is 140 rpm, and the revolution speed is 62 rpm) for 2 minutes;
(2) Adding sulphoaluminate cement, fly ash, fine aggregate, a water reducing agent and an early strength agent, and stirring for 1 minute at a low speed (the rotation speed is 140 rpm and the revolution speed is 62 rpm);
(3) Adding the rest water and stirring for 3 min rapidly (rotation speed is 285 rpm and revolution speed is 125 rpm);
(4) Adding fiber and stirring for 1 min rapidly (the rotation speed is 285 rpm and the revolution speed is 125 rpm);
(5) And (5) die filling, curing in a standard curing box for 24 hours, removing the die, and testing the mechanical properties.
The high-ductility waste incineration fly ash-cement composite-based rapid repair material prepared in examples 1-4 was subjected to uniaxial tensile test, and the result shows that the ultimate elongation of the high-ductility waste incineration fly ash-cement composite-based rapid repair material is 0.51% -1.00%, which is far greater than the tensile strain of a common concrete material, and compared with the common concrete brittle material, the tensile deformation capacity of the repair material can be improved by adopting the high-ductility waste incineration fly ash-cement composite-based rapid repair material. The high-ductility waste incineration fly ash-cement composite-based quick repair material in the embodiments 1-4 has excellent deformability after curing for 6-12 hours, is used in the field of road and bridge deck concrete repair, can reduce cracking risk and maintenance times, has obvious quick hardening characteristics compared with the traditional high-ductility cement-based composite material curing age 28d, and is beneficial to reducing road and bridge deck traffic blocking time and improving passenger transport efficiency. And the cracking risk of the road bridge floor cement-based material caused by poor tensile deformation capability can be avoided.
TABLE 5 heavy metal leaching concentration and Standard Limit (mg/L) for waste incineration fly ash
TABLE 6 leaching concentration of heavy metals (mg/L) in high-ductility msw incineration fly ash-cement composite-based rapid repair materials
As shown in Table 5, the contents of heavy metal ions in the waste incineration fly ash are relatively high, and as shown in Table 6, the high-ductility waste incineration fly ash-cement composite-based rapid repair material prepared in examples 1-4 can effectively solidify heavy metal ions and avoid the harm of the heavy metal ions to human beings.
Claims (8)
1. The high-ductility waste incineration fly ash-cement composite-based rapid repair material is characterized by comprising the following raw materials in parts by mass: 496-992 parts of sulphoaluminate cement, 124-248 parts of waste incineration fly ash, 0-620 parts of fly ash, 372-496 parts of fine aggregate, 39-74 parts of alkali-activator, 6-10 parts of water reducer, 12-62 parts of early strength agent, 0-99 parts of accelerator, 281-352 parts of water and 13-26 parts of fiber.
2. The high-ductility waste incineration fly ash-cement composite-based rapid repair material according to claim 1, wherein the fine aggregate is one or a combination of river sand and quartz sand, the grain size is 0.06-1.18 mm, and the fineness modulus is 1.20-1.71.
3. The high-ductility waste incineration fly ash-cement composite-based rapid repair material according to claim 1, wherein the alkali-activator is one or a combination of sodium hydroxide and sodium silicate.
4. The high-ductility waste incineration fly ash-cement composite-based rapid repair material according to claim 1, wherein the early strength agent is one of calcium formate, anhydrous sodium sulfate and lithium carbonate; or a combination of anhydrous sodium sulfate and lithium carbonate.
5. The high-ductility waste incineration fly ash-cement composite-based rapid repair material according to claim 1, wherein the fiber has a diameter of 20-40 μm, a length of 6-12 mm, an elastic modulus of 28-35 GPa, a tensile strength of at least 1000MPa, and an ultimate elongation of 8-12%.
6. The high-ductility waste incineration fly ash-cement composite-based rapid repair material according to claim 5, wherein the fiber is one or more of polyvinyl alcohol fiber, basalt fiber and polypropylene fiber.
7. The method for preparing the high-ductility waste incineration fly ash-cement composite-based rapid repair material according to any one of claims 1 to 6, comprising the following steps:
(1) The method comprises the steps of (1) stirring waste incineration fly ash, an alkali excitant and 1/3-1/2 of the total water in a stirrer at a rotation speed of 140 rpm and a revolution speed of 62 rpm for 1-2 minutes;
(2) Adding sulphoaluminate cement, fly ash, a water reducing agent, an accelerator, an early strength agent and fine aggregate into a stirrer at a rotation speed of 140 rpm and a revolution speed of 62 rpm, and stirring for 1-2 minutes;
(3) Adding the rest water, stirring for 2-4 minutes at a rotation speed of 285 rpm and a revolution speed of 125 rpm;
(4) Adding fibers, stirring for 1-2 minutes at a rotation speed of 285 rpm and a revolution speed of 125 rpm;
(5) And (5) die filling, curing in a standard curing box for 12-24 hours, and then die stripping.
8. The method for preparing the high-ductility waste incineration fly ash-cement composite-based rapid repair material according to claim 7, wherein the whole preparation process of the material is controlled to be 5-10 minutes.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104211358A (en) * | 2014-09-11 | 2014-12-17 | 中国中材国际工程股份有限公司 | Rapid-hardening early strength high-ductility cement-based composite material and preparation method thereof |
| CN114538839A (en) * | 2022-02-15 | 2022-05-27 | 大连理工大学 | Nano-alumina-based municipal solid waste incineration fly ash heavy metal curing material and preparation method thereof |
| CN115385622A (en) * | 2022-07-12 | 2022-11-25 | 河海大学 | Solid waste pavement repairing material and preparation method thereof |
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| CN104211358A (en) * | 2014-09-11 | 2014-12-17 | 中国中材国际工程股份有限公司 | Rapid-hardening early strength high-ductility cement-based composite material and preparation method thereof |
| CN114538839A (en) * | 2022-02-15 | 2022-05-27 | 大连理工大学 | Nano-alumina-based municipal solid waste incineration fly ash heavy metal curing material and preparation method thereof |
| CN115385622A (en) * | 2022-07-12 | 2022-11-25 | 河海大学 | Solid waste pavement repairing material and preparation method thereof |
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