CN108101406B - Super early strength concrete early strength agent and preparation method thereof - Google Patents
Super early strength concrete early strength agent and preparation method thereof Download PDFInfo
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- CN108101406B CN108101406B CN201810151792.0A CN201810151792A CN108101406B CN 108101406 B CN108101406 B CN 108101406B CN 201810151792 A CN201810151792 A CN 201810151792A CN 108101406 B CN108101406 B CN 108101406B
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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
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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
- C04B2103/12—Set accelerators
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- Structural Engineering (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention provides an ultra-early-strength concrete early strength agent and a preparation method thereof. The concrete early strength agent comprises the following components in parts by weight: 860 and 880 parts of water; 70-75 parts of diethylene glycol monobutyl ether; 40-45 parts of polyethylene glycol; 10-20 parts of isopropanol; 1850 portions of 1950 portions of soluble inorganic salt solution; 5-5.5 parts of alkaline regulator. The soluble inorganic salt solution consists of solution A and solution B, and the ratio of solution A to solution B is 1: 1; the solution A is soluble calcium salt solution, and the solution B is soluble silicate solution. The early strength agent provided by the invention can be used for curing at normal temperature and normal pressure and with the humidity of 95% to enable the 8-hour compressive strength of concrete to reach more than 60% of the designed strength, shorten the demolding time, accelerate the turnover speed of a mold, and prevent the later strength from being shrunk. The preparation method is simple and convenient to operate, all the raw material components are added according to different sequences and stirred and dispersed uniformly, the steam curing and steaming process in the prior art is eliminated, and energy conservation and consumption reduction are realized.
Description
Technical Field
The invention relates to the technical field of concrete admixtures, in particular to an ultra-early-strength concrete early strength agent and a preparation method thereof.
Background
In recent years, with the rapid development of house industrialization in China, the demand for prefabricated parts is gradually increased. At present, the prefabricated parts are produced in a mould mode, and in order to improve the production efficiency and accelerate the turnover of the mould, the concrete is required to have higher strength in a short time. However, in order to achieve the strength index, steam curing and pressure steaming processes are required, the operation process increases equipment investment and energy consumption, and meanwhile, the working period is long and the operation process is complex. In addition, at present, the naphthalene water reducing agent is used more in the prefabricated part industry, even though the polycarboxylic acid water reducing agent is used, the common polycarboxylic acid water reducing agent and the inorganic salt with early strength performance are generally compounded, so that the early strength effect is achieved, but at present, the processes of steam curing and autoclaving are difficult to get rid of.
Therefore, the prepared early strength agent has excellent super early strength effect, good concrete durability and no steam curing and pressure steaming, and plays a very important role in energy conservation and emission reduction of the precast concrete industry.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an ultra-early-strength concrete early strength agent and a preparation method thereof.
In order to achieve the above purpose, the invention provides the following technical scheme:
the super early strength concrete early strength agent comprises the following components in parts by weight: 860 and 880 parts of water; 70-75 parts of diethylene glycol monobutyl ether; 40-45 parts of polyethylene glycol; 10-20 parts of isopropanol; 1850 portions of 1950 portions of soluble inorganic salt solution; 5-5.5 parts of alkaline regulator.
Preferably, the soluble inorganic salt solution consists of solution A and solution B, and the ratio of solution A to solution B is 1: 1; the solution A is soluble calcium salt solution, and the solution B is soluble silicate solution.
Preferably, the solution A is a soluble calcium salt solution prepared by mixing soluble calcium salt and water in a ratio of 1: 4-6.
The concrete early strength agent is preferably prepared by dissolving the soluble calcium salt in water, and then adding the soluble calcium salt into water; preferably, the soluble calcium salt is calcium nitrate tetrahydrate and calcium formate, and the ratio of the two is 1: 3-6.
Preferably, the solution B is a soluble silicate solution prepared by mixing soluble silicate and water in a ratio of 1: 3.5-4.5.
Preferably, the soluble silicate is sodium metasilicate nonahydrate and/or sodium silicate; preferably, the soluble silicate is sodium metasilicate nonahydrate and sodium silicate; and the ratio of the two is 1: 2-5.
Preferably, the alkaline regulator is triethanolamine.
The preparation method of the concrete early strength agent comprises the following steps:
1) weighing the raw materials according to the proportion design of the raw materials for standby;
2) putting the water, the diethylene glycol monobutyl ether, the polyethylene glycol and the isopropanol weighed in the step 1) into a reaction kettle, and mixing and stirring until the water, the diethylene glycol monobutyl ether, the polyethylene glycol and the isopropanol are completely dissolved;
3) under the condition of normal temperature, respectively dripping the prepared solution A and solution B with equal weight parts into the solution obtained in the step 2) while stirring;
4) and 3) after the dropwise addition is finished, adding an alkaline regulator into the mixed solution, continuously stirring for 0.2-1h, and neutralizing the mixed solution in the reaction kettle until the pH value is 7-8 to obtain the super early-strength concrete early-strength agent.
In the preparation method of the concrete early strength agent, in the step 3), the dropping speed of the solution A and the solution B is preferably 1.5-2.0 kg/h.
In the preparation method of the concrete early strength agent, the stirring is preferably continued for 0.5h in the step 4).
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
1. the invention utilizes calcium salt and silicate, adjusts the Ca/Si ratio and under the action of a dispersing agent to obtain nano calcium silicate particles, and the early strength agent provides a crystal nucleus inducer at the initial stage of cement hydration, reduces the nucleation barrier of a cement hydration product, accelerates the hydration process of the hydration product, further improves the early strength of the cement-based material, but does not cause the later strength to shrink.
2. The early strength agent provided by the invention can be used for curing at normal temperature and normal pressure and with the humidity of 95% to enable the 8-hour compressive strength of concrete to reach more than 60% of the designed strength, shorten the demolding time, accelerate the turnover speed of a mold, and prevent the later strength from being shrunk.
3. The preparation method is simple and convenient to operate, all the raw material components are added into the reaction kettle according to different sequences and are uniformly stirred and dispersed, the steam curing and steaming process in the prior art is eliminated, and the energy is saved and the consumption is reduced.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
The specific embodiment of the invention provides an ultra-early-strength concrete early strength agent and a preparation method thereof. According to the technical scheme, water, diethylene glycol monobutyl ether, polyethylene glycol, isopropanol and the like are put into a reaction kettle, stirred until dissolved, the prepared solution A and solution B are simultaneously dripped into the reaction kettle at normal temperature, and an alkaline regulator is added to neutralize until the pH value is 7-8, so that the super early-strength concrete early-strength agent is obtained. The early strength agent has simple preparation process, can induce cement to hydrate to form C-S-H gel, reduce the activation energy of hydration reaction, promote the rapid development of the strength in the hardening period, can ensure that the 8H compressive strength of the concrete reaches the strength of more than 3d of common concrete with the same strength grade by curing at the normal pressure of 30 ℃ and the humidity of 95 percent, shortens the demoulding time, accelerates the turnover speed of a mould, and does not have the phenomenon of backward shrinkage of the strength in the later period; in addition, the concrete early strength agent can shorten or even eliminate the steam curing and steam pressing process of the concrete prefabricated part, save energy and reduce consumption.
Firstly, the super early strength concrete early strength agent provided by the invention comprises the following components in parts by weight:
water, 860-880 parts (e.g., 863 parts, 865 parts, 868 parts, 870 parts, 872 parts, 874 parts, 876 parts, 878 parts, 879 parts); diethylene glycol monobutyl ether, 70-75 parts (e.g., 71 parts, 71.5 parts, 72 parts, 72.5 parts, 73 parts, 73.5 parts, 74 parts, 74.3 parts, 74.8 parts); 40-45 parts of polyethylene glycol (such as 41 parts, 41.5 parts, 42 parts, 42.5 parts, 43 parts, 43.5 parts, 44 parts, 44.3 parts and 44.8 parts); isopropanol, 10-20 parts (e.g., 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts); soluble inorganic salt solution, 1850-1950 parts (e.g., 1855 parts, 1860 parts, 1865 parts, 1870 parts, 1875 parts, 1880 parts, 1890 parts, 1900 parts, 1910 parts, 1920 parts, 1930 parts, 1940 parts); 5 to 5.5 parts of alkaline regulator (for example, 5.1 parts, 5.15 parts, 5.2 parts, 5.25 parts, 5.3 parts, 5.35 parts, 5.40 parts, 5.45 parts, 5.50 parts and 5.54 parts).
Wherein the soluble inorganic salt solution consists of solution A and solution B, and the ratio of solution A to solution B is 1: 1; the solution A is soluble calcium salt solution, and the solution B is soluble silicate solution.
In a specific embodiment of the present invention, it is further preferable that the solution A is a soluble calcium salt solution prepared by mixing a soluble calcium salt and water at a ratio of 1: 4 to 6 (e.g., 1: 4, 1: 4.5, 1: 5, 1: 5.5, 1: 5.7, 1: 5.8, 1: 5.9). Still more preferably, the soluble calcium salt is calcium nitrate tetrahydrate and/or calcium formate.
Preferably, the soluble calcium salts are calcium nitrate tetrahydrate and calcium formate, and the two may be in any ratio. More preferably, the soluble calcium salts are calcium nitrate tetrahydrate and calcium formate in a ratio of from 1: 3 to 6 (e.g., 1: 3, 1: 3.5, 1: 4, 1: 4.5, 1: 5, 1: 5.5, 1: 5.9).
In a specific embodiment of the present invention, it is further preferable that the solution B is a soluble silicate solution prepared by mixing a soluble silicate and water at a ratio of 1: 3.5 to 4.5 (e.g., 1: 3.6, 1: 3.7, 1: 3.8, 1: 3.9, 1: 4, 1: 4.1, 1: 4.2, 1: 4.3, 1: 4.4). Still more preferably, the soluble silicate is sodium metasilicate nonahydrate and/or sodium silicate.
Preferably, the soluble silicate is sodium metasilicate nonahydrate and sodium silicate, and the two may be in any ratio. Still more preferably, the soluble silicate is sodium metasilicate nonahydrate and sodium silicate in a ratio of 1: 2 to 5 (e.g., 1: 2.5, 1: 2.8, 1: 3, 1: 3.5, 1: 4, 1: 4.5, 1: 4.6, 1: 4.7, 1: 4.8).
In a particular embodiment of the invention, the alkaline modifier is preferably triethanolamine.
In addition, the invention also provides a preparation method of the concrete early strength agent, which comprises the following steps:
1) weighing the raw materials according to the proportion design of the raw materials for standby;
2) putting the water, the diethylene glycol monobutyl ether, the polyethylene glycol and the isopropanol weighed in the step 1) into a reaction kettle, and mixing and stirring until the water, the diethylene glycol monobutyl ether, the polyethylene glycol and the isopropanol are completely dissolved;
3) under normal temperature (20-30 ℃) and normal pressure, the prepared equal weight parts of the solution A and the solution B are dripped simultaneously in the mixing and stirring process of the step 2), and the dripping speed is kept between 1.5 and 2.0kg/h (such as 1.55kg/h, 1.60kg/h, 1.65kg/h, 1.70kg/h, 1.75kg/h, 1.8kg/h, 1.85kg/h, 1.9kg/h and 1.95 kg/h);
4) and 3) after the dropwise adding is finished, adding an alkaline regulator into the mixed solution, continuously stirring for 0.2-1h (for example, 0.3h, 0.4h, 0.5h, 0.6h, 0.7h, 0.8h, 0.9h and 0.95h), and neutralizing the mixed solution in the reaction kettle until the pH value is 7-8 to obtain the super early strength concrete early strength agent.
Example 1:
according to the parts by weight, 860 parts of water, 75 parts of diethylene glycol monobutyl ether, 45 parts of polyethylene glycol and 20 parts of isopropanol are put into a reaction kettle and stirred until the water, the diethylene glycol monobutyl ether, the polyethylene glycol and the isopropanol are completely dissolved; under the condition of normal temperature, 930 parts of A liquid prepared by mixing 930 parts of prepared calcium nitrate tetrahydrate and water in a ratio of 1: 5 and 930 parts of B liquid prepared by mixing sodium metasilicate nonahydrate and water in a ratio of 1: 4 are simultaneously dripped into the mixture for 4 hours, and 5 parts of triethanolamine serving as an alkaline regulator is added into the mixture for neutralization regulation, so that the super early-strength concrete early-strength agent is obtained.
Example 2:
putting 870 parts of water, 70 parts of diethylene glycol monobutyl ether, 45 parts of polyethylene glycol and 15 parts of isopropanol into a reaction kettle, and stirring until the materials are completely dissolved; under the condition of normal temperature, 925 parts of A liquid prepared by equal parts by weight of calcium formate and water in a ratio of 1: 6 and 925 parts of B liquid prepared by sodium metasilicate nonahydrate and water in a ratio of 1: 3.5 are simultaneously dripped into the early strength admixture for 4.5 hours, and 5.5 parts of triethanolamine serving as an alkaline regulator is added for neutralization to obtain the super early strength concrete early strength admixture.
Example 3:
putting 880 parts of water, 70 parts of diethylene glycol monobutyl ether, 40 parts of polyethylene glycol and 10 parts of isopropanol into a reaction kettle, and stirring until the components are completely dissolved; under the condition of normal temperature, the A liquid 935 parts prepared by mixing the same weight parts of tetrahydrate calcium nitrate and water in a ratio of 1: 4 and the B liquid 935 parts prepared by mixing sodium silicate and water in a ratio of 1: 4.5 are simultaneously dripped into the mixture for 5 hours, and 5.5 parts of alkaline regulator triethanolamine is added for neutralization, so as to obtain the super early strength concrete early strength agent.
Example 4:
putting 865 parts of water, 72 parts of diethylene glycol monobutyl ether, 44 parts of polyethylene glycol and 15 parts of isopropanol into a reaction kettle, and stirring until the components are completely dissolved; at normal temperature, 950 parts of A solution prepared by equal parts by weight of soluble calcium salt (tetrahydrate calcium nitrate and calcium formate, the proportion of the two is 1: 3) and water in a ratio of 1: 4.5, 950 parts of B solution prepared by soluble silicate (sodium metasilicate nonahydrate and sodium silicate, the proportion of the two is 1: 4) and water in a ratio of 1: 3.8 are dripped into the mixture for 4.5 hours, and 5.2 parts of triethanolamine serving as an alkaline regulator is added into the mixture for neutralization, so that the super early strength concrete early strength agent is obtained.
Example 5:
putting 875 parts of water, 73 parts of diethylene glycol monobutyl ether, 42 parts of polyethylene glycol and 12 parts of isopropanol into a reaction kettle, and stirring until the components are completely dissolved; under the condition of normal temperature, 975 parts of A liquid prepared by equal parts by weight of soluble calcium salt (tetrahydrate calcium nitrate and calcium formate, the proportion of the two is 1: 5) and water in a ratio of 1: 5.5 and 975 parts of B liquid prepared by sodium silicate and water in a ratio of 1: 4.2 are simultaneously dripped into the mixture for 4.5 hours, and 5.4 parts of triethanolamine serving as an alkaline regulator is added for neutralization, so that the super early-strength concrete early strength agent is obtained.
Example 6:
putting 875 parts of water, 71 parts of diethylene glycol monobutyl ether, 43 parts of polyethylene glycol and 18 parts of isopropanol into a reaction kettle, and stirring until the components are completely dissolved; under the condition of normal temperature, 960 parts of A liquid prepared by equal parts by weight of calcium formate and water in a ratio of 1: 5.5, 960 parts of B liquid prepared by soluble silicate (sodium metasilicate nonahydrate and sodium silicate in a ratio of 1: 2) and water in a ratio of 1: 4 are simultaneously dripped into the concrete early strength admixture for 4.3 hours, and 5.3 parts of triethanolamine serving as an alkaline regulator are added for neutralization to obtain the super early strength concrete early strength admixture.
Example 7:
putting 865 parts of water, 72 parts of diethylene glycol monobutyl ether, 45 parts of polyethylene glycol and 15 parts of isopropanol into a reaction kettle, and stirring until the components are completely dissolved; under the condition of normal temperature, 945 parts of A liquid prepared by mixing calcium nitrate tetrahydrate and water in equal weight ratio and 945 parts of B liquid prepared by mixing sodium metasilicate nonahydrate and water in ratio of 1: 4.3 are simultaneously dripped into the concrete, 4.3 hours are dripped into the concrete, and 5 parts of triethanolamine serving as an alkaline regulator is added into the concrete for neutralization to obtain the super early strength concrete early strength agent.
Example 8:
putting 877 parts of water, 71 parts of diethylene glycol monobutyl ether, 42 parts of polyethylene glycol and 12 parts of isopropanol into a reaction kettle, and stirring until the materials are completely dissolved; at normal temperature, simultaneously dropwise adding 955 parts of a solution A prepared by equal parts by weight of soluble calcium salt (tetrahydrate calcium nitrate and calcium formate, the proportion of the tetrahydrate calcium nitrate and the calcium formate is 1: 6) and water in a ratio of 1: 4.6, 955 parts of a soluble silicate (sodium metasilicate nonahydrate and sodium silicate, the proportion of the sodium metasilicate nonahydrate and the sodium silicate is 1: 5) and a solution B prepared by water in a ratio of 1: 3.7, dropwise adding 4.7 hours, and adding 5.1 parts of triethanolamine serving as an alkaline regulator for neutralization to obtain the super early strength concrete early strength agent.
The super early strength concrete early strength agent obtained in the above examples 1 to 8 was added to ordinary C50 concrete in a proportion of 5.0% of the cementitious material, and the results of the test of the relevant performance indexes are shown in Table 1.
Table 1 results of performance index test of each example
In summary, the invention has the following beneficial technical effects:
1. the invention utilizes calcium salt and silicate, adjusts the Ca/Si ratio and under the action of a dispersing agent to obtain nano calcium silicate particles, and the early strength agent provides a crystal nucleus inducer at the initial stage of cement hydration, reduces the nucleation barrier of a cement hydration product, accelerates the hydration process of the hydration product, further improves the early strength of the cement-based material, but does not cause the later strength to shrink.
2. The early strength agent provided by the invention can be used for curing at normal temperature and normal pressure and with the humidity of 95% to enable the 8-hour compressive strength of concrete to reach more than 60% of the designed strength, shorten the demolding time, accelerate the turnover speed of a mold, and prevent the later strength from being shrunk.
3. The preparation method is simple and convenient to operate, all the raw material components are added into the reaction kettle according to different sequences and are uniformly stirred and dispersed, the steam curing and steaming process in the prior art is eliminated, and the energy is saved and the consumption is reduced.
The above description is only exemplary of the invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the invention is intended to be covered by the appended claims.
Claims (5)
1. The super early strength concrete early strength agent is characterized by comprising the following components in parts by weight:
860 and 880 parts of water; 70-75 parts of diethylene glycol monobutyl ether; 40-45 parts of polyethylene glycol; 10-20 parts of isopropanol; 1850 portions of 1950 portions of soluble inorganic salt solution; 5-5.5 parts of an alkaline regulator;
the soluble inorganic salt solution consists of a solution A and a solution B, and the weight part ratio of the solution A to the solution B is 1: 1;
the solution A is a soluble calcium salt solution prepared by soluble calcium salt and water according to the weight part ratio of 1: 4-6, the soluble calcium salt is calcium nitrate tetrahydrate and calcium formate, and the ratio of the two is 1: 3-6;
the solution B is a soluble silicate solution prepared from soluble silicate and water in a weight part ratio of 1: 3.5-4.5, the soluble silicate is sodium metasilicate nonahydrate and sodium silicate, and the ratio of the soluble silicate to the sodium metasilicate nonahydrate to the sodium silicate is 1: 2-5;
the pH value of the concrete early strength agent is 7-8;
the concrete early strength agent can enable the 8-hour compressive strength of concrete to reach more than 60% of the designed strength under the conditions of normal temperature and normal pressure and 95% humidity curing.
2. The concrete early strength agent according to claim 1, wherein the alkaline modifier is triethanolamine.
3. A method for preparing the concrete early strength agent as claimed in claim 1 or 2, wherein the method comprises the following steps:
1) weighing the raw materials according to the proportion design of the raw materials for standby;
2) putting the water, the diethylene glycol monobutyl ether, the polyethylene glycol and the isopropanol weighed in the step 1) into a reaction kettle, and mixing and stirring until the water, the diethylene glycol monobutyl ether, the polyethylene glycol and the isopropanol are completely dissolved;
3) under the condition of normal temperature, continuously dropwise adding the prepared solution A and solution B with equal weight parts into the solution obtained in the step 2) respectively while stirring;
4) and 3) after the dropwise addition is finished, adding an alkaline regulator into the mixed solution, continuously stirring for 0.2-1h, and neutralizing the mixed solution in the reaction kettle until the pH value is 7-8 to obtain the super early-strength concrete early-strength agent.
4. The method for preparing the concrete early strength agent according to claim 3, wherein in the step 3), the dropping speed of the solution A and the solution B is 1.5-2.0 kg/h.
5. The method for preparing the concrete early strength agent according to claim 3, wherein in the step 4), the stirring is continued for 0.5 h.
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