CN115385597B - Accelerating agent for sprayed concrete in high-heat area and preparation and use methods thereof - Google Patents
Accelerating agent for sprayed concrete in high-heat area and preparation and use methods thereof Download PDFInfo
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- CN115385597B CN115385597B CN202211047587.2A CN202211047587A CN115385597B CN 115385597 B CN115385597 B CN 115385597B CN 202211047587 A CN202211047587 A CN 202211047587A CN 115385597 B CN115385597 B CN 115385597B
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- accelerator
- sprayed concrete
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- expanding agent
- aluminum sulfate
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/10—Accelerators; Activators
- C04B2103/12—Set accelerators
-
- 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 an accelerator for sprayed concrete in a high-heat area and a preparation and use method thereof, wherein the accelerator comprises the following formula: 40-60 parts of polyepoxysuccinic acid, 16-28 parts of aluminum sulfate, 10-14 parts of calcium carbonate and 5-8 parts of expanding agent; the expanding agent comprises the following components in percentage by mass of 1-2:3-5 of calcium oxide and magnesium oxide. According to the invention, the polyepoxysuccinic acid, the aluminum sulfate, the calcium carbonate, the expanding agent and the epoxy resin modified waterborne polyurethane are combined in a specific proportion, and the components are mutually cooperated, so that hydration products have enough time and space to effectively precipitate into pores, the porosity of sprayed concrete in a high-temperature curing period is reduced, the compactness of hardened slurry is improved, the middle-later strength of the sprayed concrete at a high temperature can be effectively improved, the rebound rate of the sprayed concrete is reduced, and the bonding strength of surrounding rock is enhanced.
Description
Technical Field
The invention relates to the technical field of concrete additives, in particular to an accelerator for sprayed concrete in a high-heat area and a preparation and application method thereof.
Background
In recent years, tunnel construction is faster in the development of foundation traffic such as railway, urban subway, highway, and the like, and especially in the construction of western regions, the topography and the area are more complicated, and especially the surrounding rock temperature rise caused by high geothermal heat is more obvious, so that the mechanical property of sprayed concrete is influenced. Although the high geothermal heat can accelerate the hydration reaction rate in the early curing stage of the sprayed concrete, if the geothermal heat is too high, the thermal movement of hydration products is aggravated, and the hydration products are easily deposited. Meanwhile, the hydration product area is loose, so that the strength of the sprayed concrete in the middle and later stages is easily reduced, and the long-term performance of the sprayed concrete is further affected.
The use of the accelerator can accelerate the early hydration process of the cement paste, inhibit the hydration of silicate minerals while promoting the coagulation and hardening of the sprayed concrete, reduce the compactness of the hardened paste and further reduce the middle and later strength of the sprayed concrete. Therefore, the accelerator is applied in a high-heat environment, so that the strength of the sprayed concrete in the middle and later stages is reduced, and the rapid and effective tunnel construction requirements cannot be met.
Disclosure of Invention
In view of the above, the invention aims to provide an accelerator for sprayed concrete in high-temperature areas and a preparation and application method thereof, which solve the problem of poor performance of sprayed concrete in high-temperature environments.
The technical scheme of the invention is realized as follows:
an accelerator for sprayed concrete in hot areas, the accelerator comprising an inhibitor; the inhibitor is polyepoxysuccinic acid.
Further, the accelerator also comprises aluminum sulfate, calcium carbonate and an expanding agent; the expanding agent consists of calcium oxide and magnesium oxide.
The further proposal is that the accelerator comprises the following components in parts by weight: 40-60 parts of polyepoxysuccinic acid, 16-28 parts of aluminum sulfate, 10-14 parts of calcium carbonate and 5-8 parts of expanding agent; the expanding agent comprises the following components in percentage by mass of 1-2:3-5 of calcium oxide and magnesium oxide.
Further, according to the weight portions, 40-50 portions of polyepoxysuccinic acid, 16-20 portions of aluminum sulfate, 10-12 portions of calcium carbonate and 5-8 portions of expanding agent.
The preparation method of the accelerator comprises the following steps: mixing aluminum sulfate and calcium carbonate with 2 times of water by weight, heating and blending, adding an expanding agent and polyepoxysuccinic acid, and heating, shearing and blending to obtain the accelerator.
In a further scheme, the temperature of the heating blending is 60-70 ℃ and the time is 1-2h.
Further, the heating, shearing and blending is that heating and preserving heat for 30-50min at 50-60 ℃ and shearing for 1-3h at 60-70 ℃.
Still further, the shear rate is 2000-4000r/min.
In a further scheme, the mass ratio of the accelerator to the sprayed concrete is 0.05-0.1:1.
the application method of the accelerator is characterized in that the accelerator is mixed with sprayed concrete, and the accelerator further comprises the step of adding epoxy resin modified waterborne polyurethane accounting for 0.03-0.04% of the weight of the mixed system.
Compared with the prior art, the invention has the beneficial effects that:
the accelerator disclosed by the invention adopts polyepoxysuccinic acid as an inhibitor, can be combined with epoxy groups in epoxy resin modified waterborne polyurethane, can form a protective film on the surface of a hydration product, reduces the deposition rate of the hydration product in a high-heat environment, and ensures that the hydration product is uniformly distributed.
According to the invention, the polyepoxysuccinic acid, the aluminum sulfate, the calcium carbonate, the expanding agent and the epoxy resin modified waterborne polyurethane are combined in a specific proportion, and the components are mutually cooperated, so that hydration products have enough time and space to effectively precipitate into pores, the porosity of sprayed concrete in a high-temperature curing period is reduced, the compactness of hardened slurry is improved, the middle-later strength of the sprayed concrete at a high temperature can be effectively improved, the rebound rate of the sprayed concrete is reduced, and the bonding strength of surrounding rock is enhanced.
The experiment of the invention shows that the total heat of 24h accumulated hydration heat release is 173-185 W.h -1 The compressive strength of the 28d sprayed concrete is 54.4-56.2MPa, the rebound rate is 5.5-5.8%, the porosity is 0.10-0.11, and the bonding strength of surrounding rock is 0.26-0.29MPa.
Detailed Description
In order to better understand the technical content of the present invention, the following provides specific examples to further illustrate the present invention.
The experimental methods used in the embodiment of the invention are conventional methods unless otherwise specified.
Materials, reagents, and the like used in the examples of the present invention are commercially available unless otherwise specified.
The performance detection method related by the invention comprises the following steps:
according to the method for measuring the hydration heat of cement (GB/T12959-2008), the hydration heat release heat of the mixture when an accelerator is added is measured, the total heat of hydration heat release accumulated in 24 hours is recorded, and the test temperature is set to be 30+/-2 ℃;
and (3) measuring the rebound rate of the sprayed concrete: a wall surface is selected, concrete with a certain weight is horizontally sprayed, the spraying thickness is 70-80mm, and the mixture falling on the ground is collected, wherein the rebound rate (%) = weight of the mixture which is not adhered to the wall surface/total sprayed mixture multiplied by 100.
And (3) measuring the bonding strength of surrounding rock: according to the technical Specification for shotcrete application (JGJT 372-2016), a core drilling drawing mode is adopted for sampling, the diameter of a sampling test piece is 50-60mm at the core drilling position 3 in the area range of the same surrounding rock, the depth of the core drilling is at least 20mm, and the distance from the core drilling to the edge of the structure is not less than 150mm.
And (3) measuring the mechanical properties of the sprayed concrete: according to the inspection and acceptance Specification of construction quality of concrete structure engineering (GB 50204-2015), the compressive strength of concrete test pieces sampled by a drill core in curing periods 1d and 28d is measured, and the temperature in the curing period is set to be 60+/-5 ℃.
Porosity measurement: the porosity of the concrete test piece was measured at 28d using mercury porosimetry.
The commercial alkali-free liquid accelerator mainly containing aluminum sulfate is used as a control group.
Example 1
An accelerator for sprayed concrete in a high-heat area, wherein the accelerator comprises the following components in percentage by weight: 40kg of polyepoxysuccinic acid, 16kg of aluminum sulfate, 10kg of calcium carbonate and 5kg of expanding agent, wherein the expanding agent comprises the following components in mass ratio of 2:5 and magnesium oxide.
Example 2
An accelerator for sprayed concrete in a high-heat area, wherein the accelerator comprises the following components in percentage by weight: 60kg of polyepoxysuccinic acid, 28kg of aluminum sulfate, 14kg of calcium carbonate and 8kg of an expanding agent, wherein the expanding agent comprises the following components in mass ratio of 1:3 and magnesium oxide.
Example 3
An accelerator for sprayed concrete in a high-heat area, wherein the accelerator comprises the following components in percentage by weight: 50kg of polyepoxysuccinic acid, 20kg of aluminum sulfate, 12kg of calcium carbonate and 7kg of an expanding agent, wherein the expanding agent comprises the following components in mass ratio of 2:3 and magnesium oxide.
Example 4
An accelerator for sprayed concrete in a high-heat area, wherein the accelerator comprises the following components in percentage by weight: 43kg of polyepoxysuccinic acid, 18kg of aluminum sulfate, 11kg of calcium carbonate and 6kg of an expanding agent, wherein the expanding agent comprises the following components in mass ratio of 2:3 and magnesium oxide.
The preparation method of the accelerator in the above examples 1-4 comprises the following steps: mixing aluminum sulfate and calcium carbonate with 2 times of water, heating and blending at 65 ℃ for 2 hours, adding an expanding agent and polyepoxysuccinic acid, heating and preserving heat for 40 minutes at 55 ℃, shearing for 2 hours at 65 ℃, and heating, shearing and blending at a shearing rate of 3000r/min to obtain the accelerator.
The mass ratio of the accelerator to the sprayed concrete is 0.08:1, adding the modified aqueous polyurethane to the sprayed concrete, and adding epoxy resin of which the weight is 0.03 percent of that of the mixed system.
Example 5
The difference from example 4 is that the epoxy resin modified waterborne polyurethane is replaced by polyacrylate, which is specifically as follows:
the formula of the accelerator is as follows: 43kg of polyepoxysuccinic acid, 18kg of aluminum sulfate, 11kg of calcium carbonate and 6kg of an expanding agent, wherein the expanding agent comprises the following components in mass ratio of 2:3 and magnesium oxide.
The preparation method of the accelerator comprises the following steps: mixing aluminum sulfate and calcium carbonate with 2 times of water, heating and blending at 65 ℃ for 2 hours, adding an expanding agent and polyepoxysuccinic acid, heating and preserving heat for 40 minutes at 55 ℃, shearing for 2 hours at 65 ℃, and heating, shearing and blending at a shearing rate of 3000r/min to obtain the accelerator.
The mass ratio of the accelerator to the sprayed concrete is 0.08:1, adding to the sprayed concrete, and adding 0.03% of polyacrylate by weight of the mixed system.
Comparative example 1
Unlike example 4, in which polyepoxysuccinic acid was replaced with sulphonated lignin, the accelerator formulation was: 43kg of sulfonated lignin, 18kg of aluminum sulfate, 11kg of calcium carbonate and 6kg of expanding agent, wherein the expanding agent comprises the following components in mass ratio of 2:3 and magnesium oxide.
The preparation method of the accelerator comprises the following steps: mixing aluminum sulfate and calcium carbonate with 2 times of water, heating and blending at 65 ℃ for 2 hours, adding an expanding agent, heating and preserving heat for 40 minutes at 55 ℃, shearing for 2 hours at 65 ℃ with a shearing rate of 3000r/min, and heating, shearing and blending to obtain the accelerator.
The mass ratio of the accelerator to the sprayed concrete is 0.08:1, adding the modified aqueous polyurethane to the sprayed concrete, and adding epoxy resin of which the weight is 0.03 percent of that of the mixed system.
The experimental results of examples 3 to 5 and comparative example 1 described above are shown in the following table:
as seen from the above table, the total heat of 24 hours of cumulative hydration exotherm of examples 3 to 5 was 173 to 185 W.multidot.h -1 The polyepoxysuccinic acid, aluminum sulfate, calcium carbonate and expanding agent in specific proportion are adopted to promote the hydration reaction of cement, the 28d compressive strength is 54.4-56.2MPa, and the rebound rate is 5.5-5.8%. As can be seen from example 5, the incorporation of polyacrylate reduces the progress of hydration reaction, and can improve the early strength of the sprayed concrete, but has little influence on the middle and later strength of the sprayed concrete, and as can be seen from the porosity, the addition of the epoxy resin modified aqueous polyurethane further promotes the compactness of the sprayed concrete, and is more beneficial to improving the middle and later strength of the sprayed concrete.
Compared with the comparative example 1 and the comparative group, the cement bond strength of the hydrate product becomes loose under the high temperature condition, the strength is also reduced, meanwhile, the hydration product is unevenly diffused, the expansion agent calcium oxide, magnesium oxide, calcium carbonate and aluminum sulfate are selected, the effect of compensating shrinkage and filling particles among cements is achieved when the high-temperature rapid hydration reaction is hot, the calcium carbonate and the aluminum sulfate expand before the cement hardens, the early setting and hardening time of the cement paste is promoted, more water can be consumed, the influence of water evaporation on the hydration reaction is avoided, meanwhile, the epoxy group in the epoxy resin modified aqueous polyurethane has higher reactivity, the epoxy resin is combined with polyepoxysuccinic acid, a protective film is formed on the surface of the hydration product, the deposition speed of the hydration product under the high-temperature environment is reduced, the hydration product is evenly distributed, the polyepoxysuccinic acid, the aluminum sulfate, the calcium carbonate, the expansion agent and the epoxy resin modified aqueous polyurethane are mutually cooperated, the hydration product has enough time and space to be effectively deposited into pores, the porosity of sprayed concrete in the high-temperature period is reduced, the curing paste hardening rate is improved, the epoxy resin modified aqueous polyurethane has high-temperature bond strength and the concrete rebound strength is effectively improved after the concrete is sprayed in the high-temperature period.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (8)
1. An accelerator for sprayed concrete in a high-heat area, which is characterized by comprising an inhibitor, aluminum sulfate, calcium carbonate and an expanding agent, wherein the inhibitor is polyepoxysuccinic acid, and the expanding agent consists of calcium oxide and magnesium oxide;
the formula of the accelerator is as follows: 40-60 parts of polyepoxysuccinic acid, 16-28 parts of aluminum sulfate, 10-14 parts of calcium carbonate and 5-8 parts of expanding agent; the expanding agent comprises the following components in percentage by mass of 1-2:3-5 of calcium oxide and magnesium oxide;
when the accelerator is used, the accelerator is mixed with sprayed concrete, and the accelerator further comprises epoxy resin modified waterborne polyurethane which is added into the mixture with the weight of 0.03-0.04%.
2. The accelerator for shotcrete in hot areas according to claim 1, wherein the polyepoxysuccinic acid is 40-50 parts, the aluminum sulfate is 16-20 parts, the calcium carbonate is 10-12 parts and the expanding agent is 5-8 parts by weight.
3. Accelerator for sprayed concrete in hot areas according to claim 1 or 2, characterized in that the mass ratio of accelerator to sprayed concrete is 0.05-0.1:1.
4. the method for preparing the accelerator for the shotcrete in the hot areas according to any one of claims 1 to 3, which is characterized by comprising the following steps: mixing aluminum sulfate and calcium carbonate with 2 times of water by weight, heating and blending, adding an expanding agent and polyepoxysuccinic acid, and heating, shearing and blending to obtain the accelerator.
5. The method for preparing accelerator for shotcrete in hot areas according to claim 4, wherein the heating blending temperature is 60-70 ℃ for 1-2h.
6. The method for preparing an accelerator for shotcrete in hot areas according to claim 4, wherein the heating, shearing and blending is carried out by heating and preserving heat for 30-50min at 50-60 ℃ and shearing for 1-3h at 60-70 ℃.
7. The method for preparing accelerator for shotcrete in hot areas according to claim 4, wherein the shearing rate is 2000-4000r/min.
8. The method for using the accelerator for the sprayed concrete in the high-heat area according to any one of claims 1-3, which is characterized in that the accelerator is mixed with the sprayed concrete, and the method further comprises the step of adding epoxy resin modified waterborne polyurethane accounting for 0.03-0.04% of the weight of a mixed system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211047587.2A CN115385597B (en) | 2022-08-30 | 2022-08-30 | Accelerating agent for sprayed concrete in high-heat area and preparation and use methods thereof |
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| CN202211047587.2A CN115385597B (en) | 2022-08-30 | 2022-08-30 | Accelerating agent for sprayed concrete in high-heat area and preparation and use methods thereof |
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| CN115385597B true CN115385597B (en) | 2023-07-18 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002053357A (en) * | 2000-08-10 | 2002-02-19 | Denki Kagaku Kogyo Kk | Quick setting agent, spraying material and spraying method using the same quick setting agent |
| CN111454013A (en) * | 2020-04-08 | 2020-07-28 | 贵州天威建材科技有限责任公司 | Stabilizer for liquid alkali-free accelerator and preparation method thereof |
| CN111825390A (en) * | 2020-06-18 | 2020-10-27 | 东莞市冠峰混凝土有限公司 | Self-curing concrete |
| CN113912357A (en) * | 2021-11-27 | 2022-01-11 | 彭江骐 | Antifreezing concrete and preparation method thereof |
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2022
- 2022-08-30 CN CN202211047587.2A patent/CN115385597B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002053357A (en) * | 2000-08-10 | 2002-02-19 | Denki Kagaku Kogyo Kk | Quick setting agent, spraying material and spraying method using the same quick setting agent |
| CN111454013A (en) * | 2020-04-08 | 2020-07-28 | 贵州天威建材科技有限责任公司 | Stabilizer for liquid alkali-free accelerator and preparation method thereof |
| CN111825390A (en) * | 2020-06-18 | 2020-10-27 | 东莞市冠峰混凝土有限公司 | Self-curing concrete |
| CN113912357A (en) * | 2021-11-27 | 2022-01-11 | 彭江骐 | Antifreezing concrete and preparation method thereof |
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| CN115385597A (en) | 2022-11-25 |
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