CN110963755A - Adjustable internal curing technology for concrete - Google Patents
Adjustable internal curing technology for concrete Download PDFInfo
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- CN110963755A CN110963755A CN201910974588.3A CN201910974588A CN110963755A CN 110963755 A CN110963755 A CN 110963755A CN 201910974588 A CN201910974588 A CN 201910974588A CN 110963755 A CN110963755 A CN 110963755A
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- 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
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides an adjustable internal curing technology for concrete. Wherein the concrete material consists of cement, fly ash, blast furnace iron slag powder, sand, stone, mixing water, a high-efficiency water reducing agent, aluminosilicate mineral powder, super absorbent resin and internal curing introduced water; wherein the mass ratio of each component is as follows: cement: fly ash: blast furnace iron slag powder: sand: stone: mixing water: high-efficiency water reducing agent: aluminosilicate mineral powder: high water absorption resin: and (3) introducing 1: 0.2-0.4: 0.1-0.3: 2-3: 3-4: 0.5-0.6: 0.01-0.02: 0.1-0.3: 0.0004 to 0.0008: 0.03 to 0.06. The invention can make the concrete material have composite internal curing function, and the regulation and control are easy, and the internal curing effect is good.
Description
Technical Field
The application relates to the technical field of mass concrete material construction, in particular to an adjustable internal curing technology for concrete.
Background
The current concrete technology has the trend of high strength and high performance development, and when the high strength and high performance concrete material is applied to bridge engineering, the high strength and high performance concrete is often larger in volume, the water cement ratio is reduced, the gelled material is increased, the early hydration heat release of the concrete is increased, and the early shrinkage is increased; the early shrinkage is large, and the problem of cracks of large-volume concrete structures such as bridges and the like is easily caused. When the concrete structure cracks, the stress and the durability of the concrete structure are greatly influenced. Therefore, crack control is an important prerequisite for guaranteeing the service life of the concrete structure.
In the prior art, the concrete used for many bridges is C60 high strength concrete. And after the concrete on the top of the tower is poured, the concrete is in a high-temperature and strong-wind environment. Under the environment, the moisture in the early curing of the concrete can be quickly dissipated, and the concrete cannot be kept in a wet state for a long time, so that the concrete can be effectively cured. Meanwhile, as the age of the concrete increases, the outer surface of the concrete becomes more and more dense, and the external moisture is difficult to permeate into the concrete. By using the maintenance mode, the shrinkage of concrete cannot be effectively reduced, so that the concrete structure is easy to generate microcracks and then cracks, and the mechanical property and the durability of the concrete structure are seriously influenced.
Disclosure of Invention
In view of the above, the present invention provides a controllable internal curing technology for concrete, so that the concrete material has a composite internal curing effect, and the controllable internal curing technology is easy to control and has a good internal curing effect.
The technical scheme of the invention is realized as follows:
a concrete material is composed of cement, fly ash, blast furnace iron slag powder, sand, stone, mixing water, a high-efficiency water reducing agent, aluminosilicate mineral powder, super absorbent resin and internal curing introduced water; wherein the mass ratio of each component is as follows:
cement: fly ash: blast furnace iron slag powder: sand: stone: mixing water: high-efficiency water reducing agent: aluminosilicate mineral powder: high water absorption resin: and (3) introducing 1: 0.2-0.4: 0.1-0.3: 2-3: 3-4: 0.5-0.6: 0.01-0.02: 0.1-0.3: 0.0004 to 0.0008: 0.03 to 0.06.
Preferably, the saturated water absorption of the super absorbent resin in the concrete material is 2500-3000%.
Preferably, the specific surface area of the aluminosilicate mineral powder is 300m 2/kg-400 m2/kg, and the saturated water absorption is 15% -25%.
Preferably, the mass ratio of each component is as follows:
cement: fly ash: blast furnace iron slag powder: sand: stone: mixing water: high-efficiency water reducing agent: aluminosilicate mineral powder: high water absorption resin: and (3) introducing 1: 0.36: 0.22: 2.6: 3.5: 0.5: 0.02: 0.17: 0.0006: 0.05.
the invention also provides a preparation method of the concrete material, which comprises the following steps:
A. respectively measuring the components of the concrete material according to the mass ratio of the components;
B. uniformly stirring the sand and the stone, adding the cement, the fly ash, the blast furnace iron slag powder and the super absorbent resin, and performing dry mixing;
C. adding water-saturated aluminosilicate mineral powder and mixing water for wet mixing, and then adding internal curing introducing water and water reducing agent for stirring.
Preferably, when the sand and the stone are uniformly stirred, stirring for a preset first time period;
when dry mixing is carried out, the dry mixing is carried out for a preset second time length;
when the aluminosilicate mineral powder saturated with water and the mixing water are added for wet mixing, the wet mixing is carried out for a preset third time period;
and when water and the water reducing agent are introduced for stirring during the internal curing, stirring for a preset fourth time.
Preferably, the first time period, the second time period and the third time period are 30 seconds to 60 seconds;
the fourth time period is 30 seconds to 120 seconds.
As can be seen from the above, in the concrete material and the preparation method thereof, the used concrete material has the advantages of simple components, low cost, small cement consumption, low carbon and environmental protection. Because the concrete material adopts the super absorbent resin and the ground stone powder, the concrete material has a composite internal curing effect, can regulate and control the internal curing period, and has easy regulation and control and good internal curing effect. In addition, the aluminosilicate mineral powder used in the concrete material has certain pozzolanic activity, can consume part of unfavorable crystals CH generated by cement hydration, and provides guarantee for the strength and durability of concrete. In addition, the concrete material in the technical scheme of the invention also has the advantages of low shrinkage and small risk of cracking, thereby solving the problem of application of large-volume concrete in a strong-wind dry environment. Moreover, the technical scheme of the invention has the advantages of simple components, low cost, easy operation, obvious effect and good industrialization prospect.
Drawings
Fig. 1 is a flowchart of a method for preparing a concrete material in an embodiment of the present invention.
Detailed Description
In order to make the technical scheme and advantages of the invention more apparent, the invention is further described in detail with reference to the accompanying drawings and specific embodiments.
The invention provides a concrete material and a preparation method thereof.
In the technical scheme of the invention, the concrete material is provided, and the concrete material is composed of cement, fly ash, blast furnace iron slag powder, super absorbent resin, aluminosilicate mineral powder, sand, stone, mixing water, internal curing lead-in water and a high efficiency water reducing agent; wherein the mass ratio of each component is as follows:
cement: fly ash: blast furnace iron slag powder: sand: stone: mixing water: high-efficiency water reducing agent: aluminosilicate mineral powder: high water absorption resin: and (3) introducing 1: 0.2-0.4: 0.1-0.3: 2-3: 3-4: 0.5-0.6: 0.01-0.02: 0.1-0.3: 0.0004 to 0.0008: 0.03 to 0.06.
In addition, as an example, in a preferred embodiment of the present invention, the saturated water absorption of the super absorbent resin in the concrete material is 2500% to 3000%.
In addition, as an example, in a preferred embodiment of the invention, the specific surface area of the aluminosilicate ore powder is 300m 2/kg-400 m2/kg, and the saturated water absorption rate is 15% -25%. Therefore, the above-mentioned aluminosilicate ore powder is an ore powder having a large specific surface area, and can absorb a large amount of moisture.
In addition, as an example, in a preferred embodiment of the present invention, the mass ratio of each component is:
cement: fly ash: blast furnace iron slag powder: sand: stone: mixing water: high-efficiency water reducing agent: aluminosilicate mineral powder: high water absorption resin: and (3) introducing 1: 0.36: 0.22: 2.6: 3.5: 0.5: 0.02: 0.17: 0.0006: 0.05.
in addition, in the technical scheme of the invention, the mixing water is calculated according to the water-cement ratio, and the water is introduced in the internal curing process by considering the water absorption material to absorb water. Thus, both the blending water and the internal curing intake water may be tap water or other suitable water.
In the technical scheme of the invention, because the super absorbent resin and the water-saturated aluminosilicate mineral powder are added into the concrete material, the principle that the super absorbent resin has high sensitivity to water and the water demand is large at the early stage of cement hydration can be utilized, so that the super absorbent resin firstly returns water to enter the interior of the concrete after casting and forming, the interior is maintained, and the high water-sensitivity and the high water-demand of the super absorbent resin are realized along with the progress of hydrationAnd water diffusion due to drying, and most of the components C3A and C3S participates in the reaction; then the water can be returned for curing by the aluminosilicate mineral powder saturated by water. Compared with the higher water-absorbent resin, the aluminosilicate mineral powder has low water absorption rate and small humidity sensitivity, and is the later stage C2S and C4AF hydration provides a water source, and the aluminosilicate mineral powder can react with Calcium Hydroxide (CH) generated by cement hydration, so that hydration products fill concrete pores, the humidity diffusion coefficient of concrete is reduced, and the strength of concrete is improved.
In addition, the technical scheme of the invention also provides a preparation method of the concrete material.
Fig. 1 is a flowchart of a method for preparing a concrete material in an embodiment of the present invention. As shown in fig. 1, the preparation method of the concrete material in the embodiment of the present invention includes the following steps:
and step 101, respectively metering the components of the concrete material according to the mass ratio.
102, uniformly stirring the sand and the stone, adding the cement, the fly ash, the blast furnace iron slag powder and the super absorbent resin, and performing dry mixing.
In addition, as an example, in a preferred embodiment of the present invention, when the sand and the stone are uniformly stirred, the sand and the stone may be stirred for a preset first time period (for example, 30 seconds to 60 seconds).
In addition, as an example, in a preferred embodiment of the present invention, the dry-mixing may be performed for a preset second time period (e.g., 30s to 60 s).
103, adding water-saturated aluminosilicate mineral powder and mixing water for wet mixing, and then adding internal curing introducing water and a water reducing agent for stirring.
The concrete material can be prepared through the steps 101-103.
In addition, as an example, in a preferred embodiment of the present invention, when the water-saturated aluminosilicate ore powder and the mixing water are added for wet mixing, the mixture may be wet-mixed for a predetermined third time period (for example, 30s to 60 s).
In addition, as an example, in a preferred embodiment of the present invention, when the internal curing introducing water and the water reducing agent are added for stirring, the stirring may be performed for a preset fourth time period (for example, 30s to 120 s).
The cubic compressive strength of the concretes 3d and 7d and the shrinkage of the first 7d were measured. The cubic concrete compressive strength is shown in Table 1, and the concrete shrinkage value is shown in Table 2.
| Time (d) | 3 | 7 |
| Internal curing concrete (MPa) | 41.9 | 63.1 |
| Common same grade concrete (MPa) | 47 | 64.3 |
TABLE 1 compressive Strength of concrete
| Time (d) | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Internal curing concrete (mu epsilon) | 0 | 0 | 4 | 8 | 14 | 19 | 24 |
| Common same grade concrete (mu epsilon) | 0 | 85 | 135 | 165 | 185 | 203 | 218 |
TABLE 2 concrete shrinkage values
As can be seen from tables 1 and 2, in the technical solution of the present invention, although the internal curing material (e.g., super absorbent resin, aluminosilicate ore powder, etc.) is added to the concrete material, the strength of the concrete material finally obtained by the present invention (i.e., the internal curing concrete in tables 1 and 2) is not significantly reduced (and thus the effect of the strength of the concrete material of the internal curing material is small) but the concrete shrinkage value is significantly reduced, compared to the concrete material of the prior art. Therefore, the added internal curing material can greatly reduce the concrete shrinkage value of the concrete material, so that the risk of shrinkage cracking of the concrete structure can be greatly reduced.
In summary, in the technical scheme of the invention, because the super absorbent resin and the water-saturated aluminosilicate mineral powder are added into the concrete material, the principle that the super absorbent resin has high sensitivity to moisture and the water demand is large at the early stage of cement hydration can be utilized, so that the super absorbent resin firstly returns water to enter the concrete after casting and forming, the interior is maintained, the water return of the super absorbent resin is finished along with the progress of hydration and the diffusion of moisture caused by drying, and most of C3A and C3S participates in the reaction; then the water can be returned for curing by the aluminosilicate mineral powder saturated by water. Compared with the higher water-absorbent resin, the aluminosilicate mineral powder has low water absorption rate and small humidity sensitivity, and is the later stage C2S and C4AF hydration provides a water source, and the aluminosilicate mineral powder can react with Calcium Hydroxide (CH) generated by cement hydration, so that hydration products fill concrete pores, the humidity diffusion coefficient of concrete is reduced, and the strength of concrete is improved.
In the technical scheme of the invention, an internal and external integrated cooperative curing mode combining internal curing and external curing is adopted, namely a small water storage reservoir is formed in concrete by using some materials (called as concrete internal curing agents) absorbing water in advance, and the internal curing agents release water to inhibit the self-shrinkage development of the concrete when capillary negative pressure and humidity gradient appear in the concrete along with the hydration of the cement, so that the mechanical property and durability of the concrete are guaranteed; the curing mode of 'external curing' is that when the inside of the internal curing concrete loses water, water is supplemented from the outside in time, so that the concrete is in a wet state, and the concrete is effectively cured. Therefore, the internal and external integrated cooperative curing is an effective means for reducing the shrinkage of the concrete.
Therefore, in the technical scheme of the invention, the used concrete material has the advantages of simple components, low cost, small cement consumption, low carbon and environmental protection. Because the concrete material adopts the super absorbent resin and the ground stone powder, the concrete material has a composite internal curing effect, can regulate and control the internal curing period, and has easy regulation and control and good internal curing effect. In addition, the aluminosilicate mineral powder used in the concrete material has certain pozzolanic activity, can consume part of unfavorable crystals CH generated by cement hydration, and provides guarantee for the strength and durability of concrete.
In addition, the concrete material in the technical scheme of the invention also has the advantages of low shrinkage and small risk of cracking, thereby solving the problem of application of large-volume concrete in a strong-wind dry environment. Moreover, the technical scheme of the invention has the advantages of simple components, low cost, easy operation, obvious effect and good industrialization prospect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. The concrete material is characterized by consisting of cement, fly ash, blast furnace iron slag powder, sand, stone, mixing water, a high-efficiency water reducing agent, aluminosilicate mineral powder, super absorbent resin and internal curing introduced water; wherein the mass ratio of each component is as follows:
cement: fly ash: blast furnace iron slag powder: sand: stone: mixing water: high-efficiency water reducing agent: aluminosilicate mineral powder: high water absorption resin: and (3) introducing 1: 0.2-0.4: 0.1-0.3: 2-3: 3-4: 0.5-0.6: 0.01-0.02: 0.1-0.3: 0.0004 to 0.0008: 0.03 to 0.06.
2. The concrete material of claim 1, wherein:
the saturated water absorption of the super absorbent resin in the concrete material is 2500-3000%.
3. The concrete material of claim 1, wherein:
the specific surface area of the aluminosilicate mineral powder is 300m 2/kg-400 m2/kg, and the saturated water absorption is 15% -25%.
4. The concrete material according to claim 1, wherein the mass ratio of each component is as follows:
cement: fly ash: blast furnace iron slag powder: sand: stone: mixing water: high-efficiency water reducing agent: aluminosilicate mineral powder: high water absorption resin: and (3) introducing 1: 0.36: 0.22: 2.6: 3.5: 0.5: 0.02: 0.17: 0.0006: 0.05.
5. a method for the preparation of a concrete material according to claims 1 to 4, characterized in that it comprises the following steps:
A. respectively measuring the components of the concrete material according to the mass ratio of the components;
B. uniformly stirring the sand and the stone, adding the cement, the fly ash, the blast furnace iron slag powder and the super absorbent resin, and performing dry mixing;
C. adding water-saturated aluminosilicate mineral powder and mixing water for wet mixing, and then adding internal curing introducing water and water reducing agent for stirring.
6. The method of claim 5, wherein:
stirring the sand and the stone uniformly for a preset first time;
when dry mixing is carried out, the dry mixing is carried out for a preset second time length;
when the aluminosilicate mineral powder saturated with water and the mixing water are added for wet mixing, the wet mixing is carried out for a preset third time period;
and when water and the water reducing agent are introduced for stirring during the internal curing, stirring for a preset fourth time.
7. The method of claim 5, wherein:
the first time length, the second time length and the third time length are 30-60 seconds;
the fourth time period is 30 seconds to 120 seconds.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113845348A (en) * | 2021-10-27 | 2021-12-28 | 嘉华特种水泥股份有限公司 | Iron tailing light phase-change concrete and preparation method thereof |
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