CN111499246A - Concrete early strength composite admixture and preparation method thereof - Google Patents
Concrete early strength composite admixture and preparation method thereof Download PDFInfo
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- CN111499246A CN111499246A CN201911274627.5A CN201911274627A CN111499246A CN 111499246 A CN111499246 A CN 111499246A CN 201911274627 A CN201911274627 A CN 201911274627A CN 111499246 A CN111499246 A CN 111499246A
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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
- C04B40/0042—Powdery mixtures
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/10—Accelerators; Activators
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a concrete early strength composite admixture and a preparation method thereof, wherein the concrete early strength composite admixture comprises the following components: calcium silicate hydrate seed crystal, mineral admixture and expanding agent; the preparation method comprises the following steps: weighing calcium silicate hydrate seed crystal, mineral admixture and expanding agent, and mixing to obtain the product. The concrete early-strength composite admixture can obviously improve the 16h compressive strength of mortar, and the later strength is not inverted and shrunk.
Description
Technical Field
The invention relates to the technical field of early strength agents, in particular to a concrete early strength composite admixture and a preparation method thereof.
Background
The concrete has the advantages of low price, strong bearing capacity, high durability and the like, and is the building material with the largest usage in the world at present. With the development of high-speed rail and subway construction in China, the concrete prefabricated part becomes an important development direction of the concrete industry in China, and higher requirements are put forward on the early strength and the form removal time of concrete. The traditional chloride early strength agent contains chloride ions, and sulfate inorganic early strength agent contains alkali, so that the application has limitation, and the development of a novel early strength agent with excellent performance is urgently needed.
The hydrated calcium silicate is a main product of cement hydration and plays an important role in the strength development and the durability of concrete; therefore, calcium silicate hydrate is added into concrete as a seed crystal to induce the hydration product to separate out and crystallize more quickly, and the early strength effect is remarkable.
At present, when calcium silicate hydrate seed crystals are used, much attention is paid to the improvement of the early strength of concrete, and less attention is paid to the influence of the calcium silicate hydrate on the later strength of the concrete; meanwhile, the research and application of the calcium silicate hydrate seed crystal are mostly focused on using a single calcium silicate hydrate seed crystal as an early strength agent, and the research on the compound use of the calcium silicate hydrate seed crystal and other additives is less.
The use of calcium silicate hydrate alone as an early strength agent has limited strengthening effect and can affect later strength development. Therefore, how to break through the bottleneck of strengthening the hydrated calcium silicate and solve the problem of later strength shrinkage of concrete caused by the early strength agent is a technical problem to be solved at present.
Disclosure of Invention
Aiming at the defects existing in the problems, the invention provides the concrete early strength composite admixture with excellent early strength effect and no adverse effect on the later strength development of concrete and the preparation method thereof.
The invention discloses a concrete early strength composite admixture, which comprises: calcium silicate hydrate seed crystal, mineral admixture and expanding agent.
As a further improvement of the invention, the weight ratio of the calcium silicate hydrate seed crystal, the mineral admixture and the expanding agent is (0.1-1): 2-4): 1-2.
As a further improvement of the invention, the calcium silicate hydrate seed crystal comprises: soluble calcium salt, soluble silicon salt, dispersant and water;
the weight ratio of the soluble calcium salt to the soluble silicon salt to the dispersant is (2.5-20) to (4-10) to (1-10).
As a further improvement of the invention, the soluble calcium salt is calcium nitrate tetrahydrate, the soluble silicon salt is anhydrous sodium silicate, and the dispersing agent is polyoxyethylene ether surfactant with molecular weight of 3000-30000.
As a further improvement of the invention, the mineral admixture is ground slag powder, and the expanding agent is calcium sulphoaluminate.
As a further improvement of the invention, the mixing amount of the concrete early strength composite admixture in the concrete is 15-35% of the rubber material.
The invention also discloses a preparation method of the concrete early strength composite admixture, which comprises the following steps:
weighing calcium silicate hydrate seed crystal, mineral admixture and expanding agent, and mixing to obtain the calcium silicate hydrate seed crystal;
wherein the weight ratio of the calcium silicate hydrate seed crystal to the mineral admixture to the expanding agent is (0.1-1) to (2-4) to (1-2).
As a further improvement of the invention, the preparation method of the calcium silicate hydrate seed crystal comprises the following steps:
respectively preparing soluble calcium salt and soluble silicon salt into aqueous solutions;
adding a dispersing agent and water into a reaction kettle, and setting a preset reaction temperature and a preset stirring speed;
after stirring for a preset time, dropwise adding a soluble calcium salt solution and a soluble silicon salt solution into the reaction kettle simultaneously to perform reaction;
and after the reaction is finished, spraying powder and drying to obtain the calcium silicate hydrate seed crystal.
As a further improvement of the invention, the mass concentration of the soluble calcium salt solution is 50-70%, and the mass concentration of the soluble silicon salt solution is 5-25%.
As a further improvement of the present invention,
the reaction temperature is 20-80 ℃, and the stirring speed is 100-800 rpm;
the stirring preset time is 0.5 h-1 h;
the simultaneous dripping time of the soluble calcium salt solution and the soluble silicon salt solution is 1-48 h, the reaction is continued for 0.5-2 h after the dripping is finished, and the powder spraying is carried out at 200 ℃ by a powder spraying tower for drying.
Compared with the prior art, the invention has the beneficial effects that:
the concrete early-strength composite admixture can obviously improve the 16h compressive strength of mortar, and the later strength is not inverted and shrunk.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention is described in further detail below:
the invention provides a concrete early strength composite admixture, which comprises: calcium silicate hydrate seed crystal, mineral admixture and expanding agent; wherein the weight ratio of the calcium silicate hydrate seed crystal to the mineral admixture to the expanding agent is (0.1-1) to (2-4) to (1-2).
The invention also provides a preparation method of the concrete early strength composite admixture, which comprises the following steps: weighing calcium silicate hydrate seed crystal, mineral admixture and expanding agent, and mixing to obtain the product.
Wherein the content of the first and second substances,
the calcium silicate hydrate seed crystal comprises: soluble calcium salt, soluble silicon salt, dispersant and water; the weight ratio of the soluble calcium salt to the soluble silicon salt to the dispersant is (2.5-20) to (4-10) to (1-10). Further, the calcium silicate hydrate seed crystal comprises the following components in percentage by weight: 2.5 to 20 percent of soluble calcium salt, 4.0 to 10 percent of soluble silicon salt, 1.0 to 8.0 percent of dispersant and the balance of water.
Further, the soluble calcium salt is calcium nitrate tetrahydrate, the soluble silicon salt is anhydrous sodium silicate, and the dispersing agent is polyoxyethylene ether surfactant with the molecular weight of 3000-30000.
The preparation method of the calcium silicate hydrate seed crystal comprises the following steps:
respectively preparing soluble calcium salt and soluble silicon salt into aqueous solutions; wherein, the mass concentration of the soluble calcium salt solution is 50-70 percent, and the mass concentration of the soluble silicon salt solution is 5-25 percent;
adding a dispersing agent and water into a reaction kettle, and setting a preset reaction temperature and a preset stirring speed; wherein the reaction temperature is 20-80 ℃, and the stirring speed is 100-800 rpm;
after stirring for a preset time, dropwise adding a soluble calcium salt solution and a soluble silicon salt solution into the reaction kettle simultaneously to perform reaction; wherein the stirring preset time is 0.5 h-1 h, preferably 0.5 h; the dripping time of the soluble calcium salt solution and the soluble silicon salt solution is 1-48 h, and the reaction is continued for 0.5-2 h after the dripping is finished;
after the reaction is finished, spraying powder and drying to obtain hydrated calcium silicate seed crystals; wherein, the powder spraying is carried out at 200 ℃ by a powder spraying tower and is dried.
The mineral admixture of the invention is ground slag powder.
The expanding agent of the invention is calcium sulphoaluminate.
When in use, the mixing amount of the concrete early strength composite admixture in the concrete is 15 to 35 percent of the rubber material, and the preferred mixing amount is 20 percent.
The components of the invention have the following functions:
the hydrated calcium silicate added into the concrete can play a crystal nucleus effect, accelerate cement hydration and improve the early strength of the concrete, but can cause the interface structure, the pore structure and the like of the concrete to change, so that the concrete shrinks and becomes larger and the later strength shrinks inversely.
The fine ground slag powder is mixed into the concrete, has a micro-aggregate effect and a crystal nucleus effect, can improve the structure of a concrete interface and reduces the mutual overlapping of cement early hydration products. However, the ground slag powder needs calcium hydroxide for excitation, and the hydrated calcium silicate accelerates the hydration of cement, so that a large amount of calcium hydroxide is generated to excite the ground slag powder.
The calcium sulphoaluminate can react with hydration products of cement clinker, such as calcium hydroxide, to generate hydrated calcium sulphoaluminate, namely ettringite, so that volume expansion is generated. The calcium silicate hydrate accelerates the cement hydration, and a large amount of calcium hydroxide can be generated, so that the calcium hydroxide reacts with calcium sulphoaluminate, the shrinkage of concrete is reduced, and the later strength shrinkage caused by microcracks generated by shrinkage is avoided.
Example 1
50.0kg of calcium nitrate tetrahydrate and 50.0kg of water were weighed out to form a 50.0% aqueous solution, and 15.0kg of sodium metasilicate and 85.0kg of water were weighed out to form a 15.0% aqueous solution. 10.0kg of a dispersing agent and 18.2kg of water were added to a reaction kettle, the temperature was set at 60 ℃, the stirring rate was 400rpm, and after stirring for 0.5 hour, 26.37kg of a calcium nitrate solution and 45.43kg of a sodium silicate solution were simultaneously added dropwise while maintaining the stirring, and the dropping speed was controlled so that the dropping time was 24 hours. And (3) continuously stirring for 2h after the dropwise addition is finished, and then spraying powder at 200 ℃ for drying to obtain the calcium silicate hydrate seed crystal which is marked as CSH-1.
1kg of calcium silicate hydrate seed crystal, 20kg of mineral admixture and 10kg of expanding agent are uniformly mixed to obtain the early strength composite admixture which is marked as ZQ-1.
Example 2
50.0kg of calcium nitrate tetrahydrate and 50.0kg of water were weighed out to form a 50.0% aqueous solution, and 15.0kg of sodium metasilicate and 85.0kg of water were weighed out to form a 15.0% aqueous solution. 10.0kg of a dispersing agent and 30.82kg of water are added into a reaction kettle, the temperature is set to be 40 ℃, the stirring speed is 400rpm, after stirring for 0.5h, 31.78kg of a calcium nitrate solution and 27.40kg of a sodium silicate solution are simultaneously dripped, the stirring is kept, and the dripping speed is controlled so that the dripping time is 24 h. And (3) continuously stirring for 1h after the dropwise addition is finished, and then spraying powder at 200 ℃ for drying to obtain the calcium silicate hydrate seed crystal which is marked as CSH-2.
3kg of calcium silicate hydrate seed crystal, 12kg of mineral admixture and 6kg of expanding agent are uniformly mixed to obtain the early strength composite admixture which is marked as ZQ-2.
Comparative example 1
The calcium silicate hydrate seed in example 1, CSH-1.
Comparative example 2
The calcium silicate hydrate seed in example 2, CSH-2.
Comparative example 3
A mixture of mineral admixture and expanding agent 2: 1.
Comparative example 4
Blank control group.
The early strength performance of the early strength agent was evaluated using the mortar mix ratios shown in table 1.
TABLE 1 mortar mixing ratio
| Reference cement (g) | Common mineral powder (g) | Classifying sand (g) | Water (g) | Water reducing agent (g) |
| 810 | 90 | 1340 | 250 | 5 |
And (3) forming a mortar test piece according to the mixing proportion in the table 1, ensuring that the mixing amount of the calcium silicate hydrate crystal seeds in the comparative example is consistent with that in the embodiment, and curing the formed mortar under the standard condition. Table 2 shows the mortar strength data.
TABLE 2 mortar Strength test results
As can be seen from Table 2, the early strength composite admixture provided by the invention can obviously improve the 16h compressive strength of the mortar, the strengthening effect is better than that of a comparative example, and the later strength is not shrunk.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to 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 concrete early strength composite admixture is characterized by comprising the following components in percentage by weight: calcium silicate hydrate seed crystal, mineral admixture and expanding agent.
2. The concrete early strength composite admixture as defined in claim 1, wherein the weight ratio of said hydrated calcium silicate seed crystal, mineral admixture and expanding agent is (0.1-1): 2-4): 1-2.
3. The concrete early strength composite admixture of claim 1, wherein said calcium silicate hydrate seed crystals comprise: soluble calcium salt, soluble silicon salt, dispersant and water;
the weight ratio of the soluble calcium salt to the soluble silicon salt to the dispersant is (2.5-20) to (4-10) to (1-10).
4. The concrete early strength composite admixture according to claim 3, wherein said soluble calcium salt is calcium nitrate tetrahydrate, said soluble silicate is anhydrous sodium silicate, and said dispersant is polyoxyethylene ether surfactant having a molecular weight of 3000 to 30000.
5. The concrete early strength composite admixture according to claim 1, wherein said mineral admixture is ground slag powder and said expansion agent is calcium sulfoaluminate.
6. The concrete early strength composite admixture is characterized in that the mixing amount of the concrete early strength composite admixture in concrete is 15-35% of that of a rubber material.
7. A method for preparing the concrete early strength composite admixture as defined in any one of claims 1 to 6, comprising:
weighing calcium silicate hydrate seed crystal, mineral admixture and expanding agent, and mixing to obtain the calcium silicate hydrate seed crystal;
wherein the weight ratio of the calcium silicate hydrate seed crystal to the mineral admixture to the expanding agent is (0.1-1) to (2-4) to (1-2).
8. The method of claim 7, wherein the calcium silicate hydrate seed crystal is prepared by a method comprising:
respectively preparing soluble calcium salt and soluble silicon salt into aqueous solutions;
adding a dispersing agent and water into a reaction kettle, and setting a preset reaction temperature and a preset stirring speed;
after stirring for a preset time, dropwise adding a soluble calcium salt solution and a soluble silicon salt solution into the reaction kettle simultaneously to perform reaction;
and after the reaction is finished, spraying powder and drying to obtain the calcium silicate hydrate seed crystal.
9. The method according to claim 8, wherein the soluble calcium salt solution has a mass concentration of 50 to 70% and the soluble silicon salt solution has a mass concentration of 5 to 25%.
10. The method according to claim 8,
the reaction temperature is 20-80 ℃, and the stirring speed is 100-800 rpm;
the stirring preset time is 0.5 h-1 h;
the simultaneous dripping time of the soluble calcium salt solution and the soluble silicon salt solution is 1-48 h, the reaction is continued for 0.5-2 h after the dripping is finished, and the powder spraying is carried out at 200 ℃ by a powder spraying tower for drying.
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Cited By (3)
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| CN114180873A (en) * | 2021-12-27 | 2022-03-15 | 武汉理工大学 | Thermokalite-excited mineral powder crystal nucleus early strength agent, and preparation method and application thereof |
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