CN110255949B - Concrete early strength agent and preparation method thereof - Google Patents
Concrete early strength agent and preparation method thereof Download PDFInfo
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- CN110255949B CN110255949B CN201910518703.6A CN201910518703A CN110255949B CN 110255949 B CN110255949 B CN 110255949B CN 201910518703 A CN201910518703 A CN 201910518703A CN 110255949 B CN110255949 B CN 110255949B
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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
Abstract
The invention discloses a concrete early strength agent and a preparation method thereof, belongs to the field of concrete admixtures, and solves the problem that the early strength effect of the early strength agent on concrete in a low-temperature environment is not obvious. The concrete early strength agent comprises the following components in parts by weight: 20-50 parts of calcium nitrate; 0.1-0.6 part of triethanolamine; 3-8 parts of aluminum sulfate; 20-40 parts of nano silicon dioxide; 5-10 parts of ethylene glycol; 3-8 parts of water-soluble hydroxide; the inorganic metal salt comprises (1-3) inorganic metal salt and water-soluble hydroxide in parts by weight: 1; the water-soluble hydroxide contains 1.3-2 parts of lithium hydroxide; the metal cation in the inorganic metal salt is a combination of a first ion and a magnesium ion or a magnesium ion, and the first ion is one of an iron ion, a ferrous ion and an aluminum ion. The invention can achieve better early strength effect when the early strength agent is used in low temperature environment.
Description
Technical Field
The invention relates to the field of concrete admixtures, in particular to a concrete early strength agent and a preparation method thereof.
Background
The concrete is artificial stone which is prepared by taking cement as a main cementing material, adding water, sand, stones and chemical additives and mineral admixtures if necessary, mixing the materials according to a proper proportion, uniformly stirring, densely molding, curing and hardening. When the concrete is used, various additives are required to be added, so that the comprehensive performance of the concrete is improved.
The early strength agent is one of concrete additives, and is mainly used for improving the early cement hydration speed of concrete, so that the early strength of the concrete is improved, and the later strength of the concrete is not obviously influenced.
The hydration reaction of cement mainly comprises: hydration reaction of tricalcium silicate and water to produce calcium silicate hydrate (C-S-H gel) and calcium hydroxide; hydration of dicalcium silicate is similar to that of the first step but at a slower speed; ③ tricalcium aluminate generates hydrated calcium aluminate and finally turns into garnet; fourthly, the hydration of the iron phase solid solution is slow. From the above-mentioned reactions, the hydration reactions of cement are mainly the hydration of tricalcium silicate and the hydration of dicalcium silicate.
During winter construction, after the early strength agent is added into concrete, the cement begins to hydrate for a long time due to low ambient temperature and the hydration reaction is slow, so that the effect of the early strength agent is not obvious, the early strength of the concrete added with the early strength agent cannot reach the expected value, and the engineering construction progress is slow and obvious.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and the first object of the invention is to provide a concrete early strength agent, so that the early strength agent can achieve a better early strength effect when used in a low-temperature environment.
The second purpose of the invention is to provide a preparation method of the concrete early strength agent, which realizes the preparation of the early strength agent.
In order to achieve the first object, the invention provides the following technical scheme:
the technical purpose of the invention is realized by the following technical scheme:
the concrete early strength agent comprises the following components in parts by weight:
20-50 parts of calcium nitrate;
0.1-0.6 part of triethanolamine;
3-8 parts of aluminum sulfate;
20-40 parts of nano silicon dioxide;
5-10 parts of ethylene glycol;
3-8 parts of water-soluble hydroxide;
the inorganic metal salt comprises (1-3) inorganic metal salt and water-soluble hydroxide in parts by weight: 1;
the water-soluble hydroxide contains 1.3-2 parts of lithium hydroxide;
the metal cation in the inorganic metal salt is a combination of a first ion and a magnesium ion or the magnesium ion, and the first ion is one of an iron ion, a ferrous ion and an aluminum ion.
By adopting the technical scheme, the main early strength agent components are formed by matching calcium nitrate, triethanolamine, aluminum sulfate and nano silicon dioxide. The calcium nitrate is a water-soluble substance, and after the calcium nitrate is added into the cement mixture, the concentration of calcium ions in water is improved, the hydration reaction of tricalcium silicate, dicalcium silicate and tricalcium aluminate is promoted to be carried out in the forward reaction direction, and the initial hydration speed of the cement is improved. The triethanolamine has an emulsifying effect, can be adsorbed on the surface of cement particles to form a charged hydrophilic membrane, reduces the surface tension of a solution, accelerates the contact and permeation of water and the cement particles, and promotes the hydrolysis of the cement particles; the N atom has a pair of common electrons, and can easily form a covalent bond with a metal cation to form a complex, and the complex forms a soluble region in a solution, so that the diffusion efficiency of a hydration product is improved.
After the aluminum sulfate is added, the pH value of the whole system can be reduced, the reaction is promoted, and the coagulation and hardening of cement are accelerated; and the aluminum ions are high-valence cations, have a compression effect on a diffusion double electric layer of the C-S-H colloidal ions, can accelerate the coagulation of the C-S-H colloidal ions and reduce the concentration of the C-S-H colloidal ions in a liquid phase, thereby promoting the hydration reaction of the tricalcium silicate to proceed towards the reaction direction.
The surface of the nano silicon dioxide particles has high activity unsaturated bonds ≡ Si-O-and ≡ Si-, the unsaturated bonds and Ca (OH) exist in the early stage of hydration reaction2The C-S-H gel with small particle size is generated by reaction and can be used as a nucleation activation point of hydration reaction, so that a hydration product directly and continuously grows on the surface of the nano-particles, the hydration of cement is promoted, and the early strength is obviously improved.
The glycol can be easily dissolved with water, and can be used as an antifreeze to reduce the freezing temperature of water. When the concrete is stirred, water is added into the concrete, and at the moment, the early strength agent is added, and the glycol and the water are mutually dissolved to play a role in lowering the water freezing point.
The water-soluble hydroxide includes lithium hydroxide, which is soluble in water and exothermic. At the initial stage of cement reaction, the ambient temperature and the water temperature are low, and the lithium hydroxide has the solubility in water of about 12.7-13g in the temperature range of 0-30 ℃, and can be dissolved in water at low temperature, so that the dissolution heat is generated, the start of hydration reaction is promoted, and the dissolution heat is used as heat for initiating the hydration reaction, so that the time required for the start of the hydration reaction is shortened; once the hydration reaction starts, the heat generated by the hydration reaction and the lithium hydroxide dissolution heat provide heat for the subsequent hydration reaction, and the hydration reaction rate is comprehensively improved by combining the early strength agent components. Meanwhile, the lithium ions have smaller ion radius and strong planned action, accelerate the fracture of the hydration protective film on the surface of the cement particles, and increase the contact of water and the cement particles, thereby further improving the rate of the initial hydration reaction.
After the hydroxide is dissolved in water and the heat of dissolution is released, the metal ions in the inorganic metal salt and the hydroxide radical generate a poorly or slightly water-soluble complex or precipitate (e.g., magnesium hydroxide) which can fill the filler material in the pores of the concrete, thereby improving the early strength of the concrete.
More preferably: the anion in the inorganic metal salt is an oxygen-containing inorganic acid radical.
By adopting the technical scheme, cations of inorganic metal salts can contain strong reductive ions such as chloride ions and bromide ions, can damage a passivation film on the surface of the steel bar to cause local corrosion of the steel bar, has a catalytic action on the corrosion process, and is not beneficial to the use of reinforced concrete. Therefore, in the scheme, oxygen-containing inorganic acid is refined and selected, and corrosion of chloride ions, bromide ions and the like which are possibly used to the steel bar is avoided.
More preferably: the anion in the inorganic metal salt is at least one of carbonate and borate.
By adopting the technical scheme, sulfate can be generated in a concrete system after the sulfate is introduced, and the sulfate has the risks of corroding and destroying concrete minerals and can influence the durability of concrete. The carbonate and borate have stable performance, on the other hand, because of the addition of the lithium salt, compact hydration products produced in the early stage of hydration reaction can wrap cement minerals and influence the late stage hydration reaction process, and the boric acid can play a role in retarding in concrete, so that the influence of the lithium salt on the late stage hydration reaction process is reduced.
More preferably: the inorganic metal salt is magnesium carbonate.
By adopting the technical scheme, when the inorganic metal salt is single-component magnesium carbonate, the magnesium carbonate and lithium hydroxide strong base generate magnesium hydroxide precipitate, and the early strength of the concrete is improved.
More preferably: the inorganic metal salt comprises the following components in parts by weight (1.5-4): 1 of aluminum borate and magnesium carbonate.
By adopting the technical scheme, the generated magnesium hydroxide and aluminum hydroxide precipitates fill the concrete, the early strength of the concrete is improved, and meanwhile, the boric acid plays a role in corrosion inhibition and reduces the influence of lithium salt on the later hydration reaction. And in the reaction process of the aluminum ions and the strong base, colloidal or flocculent aluminum hydroxide is generated. Compared with precipitated magnesium hydroxide, the colloidal aluminum hydroxide has certain deformation capacity and internal gaps, and the early strength of the concrete is improved by filling the concrete with the colloid and the precipitate; meanwhile, the colloid has certain deformation capacity, so that the gap of the concrete cannot be blocked, and the later-stage hydration reaction is facilitated. Meanwhile, with the progress of hydration reaction, the temperature of the concrete system is increased, the aluminum hydroxide colloid is gradually decomposed into aluminum oxide and water, and the generated water can be used for the hydration reaction.
More preferably: the weight part ratio of the inorganic metal salt to the water-soluble hydroxide is (2-3): 1.
by adopting the technical scheme, metal ions in the inorganic metal salt can be completely precipitated or converted into colloid to fill the concrete, and the inorganic metal salt is fully utilized.
More preferably: the concrete early strength agent also comprises 10-17 parts of set cement, and the fineness of the set cement is more than 600 meshes.
By adopting the technical scheme, the cement stone as a crystal blank material can obviously reduce the energy barrier of precipitation of hydration products, so that the supersaturated solution can rapidly precipitate crystals, the concentration of the hydration products in the liquid phase is reduced, the hydration reaction speed is accelerated, and the effect of improving the early strength is achieved.
More preferably: the concrete early strength agent also comprises 3-8 parts of calcium lignosulphonate.
By adopting the technical scheme, the calcium lignosulfonate is an anionic surfactant, has strong dispersibility, can well disperse all components, and improves the dispersion uniformity of all components; the cement stone as a crystal blank material can obviously reduce the energy barrier of precipitation of hydration products, so that the supersaturated solution can rapidly precipitate crystals, the concentration of the hydration products in the liquid phase is reduced, the hydration reaction speed is accelerated, and the effect of improving the early strength is achieved.
In order to achieve the second object, the invention provides the following technical scheme: a preparation method of a concrete early strength agent comprises the following steps:
s1: uniformly mixing and stirring calcium nitrate, triethanolamine, aluminum sulfate, nano silicon dioxide, ethylene glycol and an auxiliary agent to form a mixture A;
s2: and (3) putting the water-soluble hydroxide and the inorganic metal salt into the mixture A, and uniformly mixing.
More preferably: in the S1, stirring for 15-25min at the temperature of 25-35 ℃ to form a mixture A; in S2, the temperature of mixture a is lowered to 5 to 15 ℃ before the water-soluble hydroxide and the inorganic metal salt are added to mixture a.
By adopting the technical scheme, the mixing uniformity can be improved by heating and mixing; triethanolamine is solid below 20 ℃, and only glycol liquid is mixed with other substances before S2, so that the liquid content in the mixture A is reduced, and the possibility of water-soluble hydroxide dissolving in glycol is reduced; in the present application, 5-10 parts of liquid ethylene glycol is provided, and 20-40 parts of nano-silica is contained in the solid component at the maximum, so that the ethylene glycol and the nano-silica can form a paste-like mixture during stirring, thereby reducing the possibility of hydroxide dissolving in the ethylene glycol.
In conclusion, the invention has the following beneficial effects:
1. by adopting the lithium hydroxide and the inorganic metal salt, the lithium hydroxide is dissolved in water to release heat and is used as heat for initiating a hydration reaction, the time required for starting the hydration reaction is shortened, and the provided lithium ions can accelerate the hydration reaction; meanwhile, metal ions in the inorganic metal salt and hydroxide radicals generate complex compounds or precipitates which are insoluble or slightly soluble in water, and the complex compounds or precipitates can fill concrete pores, so that the early strength of the concrete is improved;
2. oxygen-containing inorganic acid is used as anions of inorganic metal salt, ions with strong reducibility, such as aluminum ions and bromide ions, are removed, and corrosion to the steel bar possibly caused is reduced;
3. by adopting at least one of carbonate and borate as the anion in the inorganic metal salt, the carbonate and borate have stable performance, and on the other hand, the boric acid can play a role in retarding coagulation, thereby reducing the influence of lithium salt on the late hydration reaction process;
4. the concrete is filled by adopting aluminum borate and magnesium carbonate, generated magnesium hydroxide and aluminum hydroxide precipitates, the colloidal aluminum hydroxide has certain deformation capacity and internal gaps compared with the precipitated magnesium hydroxide, and the early strength of the concrete is improved by filling the concrete through the cooperation of the colloid and the precipitates; meanwhile, the colloid has certain deformation capacity, so that the gap of the concrete cannot be blocked, and the later-stage hydration reaction is facilitated.
Detailed Description
Examples 1 to 12: the concrete early strength agent comprises the components and the corresponding mass shown in the table 1 in the embodiments 1, 4, 7 and 10-12, and is prepared by the following steps:
s1: mixing calcium nitrate, triethanolamine, aluminum sulfate, nano silicon dioxide, ethylene glycol and an auxiliary agent, preserving heat at 35 ℃, and stirring at a stirring speed of 30r/min for 25min to form a mixture A;
s2: and cooling the mixture A to 15 ℃, adding the water-soluble hydroxide and the inorganic metal salt into the mixture A, and stirring at the temperature of 15 ℃ and the stirring speed of 30r/min for 25min to obtain the early strength agent.
TABLE 1 examples 1, 4, 7, 10-12 components and corresponding masses (kg)
In example 1, sodium hydroxide was used as the remaining hydroxide, and magnesium carbonate was used as the inorganic metal salt.
Example 2: a concrete early strength agent is different from the concrete early strength agent in the embodiment 1 in that potassium hydroxide is adopted as the rest of hydroxide in the embodiment 2, and 1kg of ferric chloride and 2kg of magnesium sulfate are adopted as inorganic metal salts.
Example 3: a concrete early strength agent differs from example 1 in that 1kg of sodium hydroxide and 0.7kg of potassium hydroxide are used as the remaining hydroxides, and 1.5kg of aluminum carbonate and 1.5kg of magnesium chloride are used as inorganic metal salts.
In example 4, potassium hydroxide was used as the remaining hydroxide, and magnesium carbonate was used as the inorganic metal salt.
Example 5: a concrete early strength agent is different from the concrete early strength agent in example 4 in that sodium hydroxide is adopted as the rest of hydroxide in example 5, and aluminum borate is adopted as the inorganic metal salt.
Example 6: a concrete early strength agent is different from the concrete early strength agent in example 4 in that 2kg of sodium hydroxide and 1.4kg of potassium hydroxide are used as the rest of the hydroxides in example 6, and 5kg of magnesium carbonate and 5kg of aluminum borate are used as the inorganic metal salts.
In example 7, sodium hydroxide and inorganic metal salts of 9.6kg of magnesium carbonate and 14.4kg of aluminum borate were used as the remaining hydroxides.
Example 8: a concrete early strength agent is different from the concrete early strength agent in example 7 in that potassium hydroxide is used as the rest of the hydroxide in example 8, and 8kg of magnesium carbonate and 16kg of aluminum borate are used as the inorganic metal salts.
Example 9: a concrete early strength agent is different from the concrete early strength agent in example 7 in that sodium hydroxide, 4.8kg of magnesium carbonate as an inorganic metal salt and 19.2kg of aluminum borate are used as the rest of the hydroxide in example 9.
Example 13: a preparation method of a concrete early strength agent comprises the following steps:
s1: mixing calcium nitrate, triethanolamine, aluminum sulfate, nano silicon dioxide, ethylene glycol and an auxiliary agent, preserving heat at 25 ℃, and stirring for 15min at a stirring speed of 30r/min to form a mixture A;
s2: and cooling the mixture A to 15 ℃, adding the water-soluble hydroxide and the inorganic metal salt into the mixture A, and stirring at the temperature of 15 ℃ and the stirring speed of 30r/min for 25min to obtain the early strength agent.
Example 14: a preparation method of the concrete early strength agent is different from the embodiment 13 in that in S1, the temperature is kept at 30 ℃, and the mixture A is formed by stirring at the stirring speed of 30r/min for 20 min. In S2, cooling the mixture A to 10 ℃; stirring at 10 deg.C and 30r/min for 25min to obtain early strength agent.
Comparative examples 1 to 3: the difference from example 7 is that the components included and the corresponding masses are shown in table 2:
TABLE 2 comparative examples 1-3 components and corresponding masses (kg)
In comparative example 2, iron hydroxide was used as the water-soluble hydroxide.
In comparative example 3, iron hydroxide was used as the water-soluble hydroxide, and calcium bromide was used as the inorganic metal salt.
Characterization experiment:
concrete strength test
Subject: examples 1-12 and comparative examples 1-3 were prepared according to example 13 for a total of 15 experimental groups.
The experimental method comprises the following steps: the addition amount of the early strength agent in the concrete is 5%, C30 common concrete with the same weight is selected, and the early strength agent and the common concrete are stirred and mixed to obtain the samples 1-12 and the comparative samples 1-3. Under the conditions of 5 +/-3 ℃ of ambient temperature and 40 +/-10 RH percent of ambient humidity, standard concrete test pieces of 3d age, 28d age and 60d age are prepared, 3 concrete test pieces are taken from each group, the surface of each test piece is cleaned to be clean, each concrete test piece is placed on a standard compressive strength testing machine, pressure is sequentially applied until cracks appear on the surface of each test piece, the pressure value at the moment is recorded, the highest value is removed from each group, the lowest value is removed, and then the average value of the rest test pieces is taken as the compressive strength representative value of the group.
The experimental results are as follows: the concrete low temperature early strength test results are reported in table 3.
TABLE 3 record of the results of the low temperature early strength test of the concrete
And (3) data analysis: the 3d compressive strength and the 28d compressive strength can show the early hydration speed and the hydration degree of the concrete, so that the early strength effect of the early strength agent is shown, and the 60d compressive strength can show the later hydration speed and the hydration degree of the concrete. As can be seen from the above tables, the 3d, 28d and 60d compressive strengths of comparative examples 1-3 are lower than those of examples 1-12; in the examples, the early strength effects were good to poor in the order of example 7-9, example 10-12, example 4-6, and example 1-3.
The early strength agent in comparative sample 1 does not adopt hydroxide and inorganic metal salt, the early strength agent in comparative sample 2 adopts water-insoluble ferric hydroxide, and the early strength agent in comparative sample 3 adopts water-insoluble ferric hydroxide and calcium bromide. No substances capable of generating heat of solution exist in the comparison samples 1-3, so that the early hydration reaction starts very slowly, and the cross samples all show poor early strength effect; in the comparison sample 3, calcium bromide is added, and has the effect of promoting cement hydration, so the early strength effect of the comparison sample 3 is better than that of the other two comparison samples.
In examples 7 to 9, the hydroxide generates heat of dissolution when dissolved in water, and provides heat for the start of the hydration reaction, and the heat is used as heat for initiating the hydration reaction, thereby shortening the time required for the start of the hydration reaction; magnesium carbonate and aluminum borate are adopted, magnesium hydroxide and aluminum hydroxide are generated by the magnesium carbonate, the aluminum borate and hydroxide, the magnesium hydroxide is solid precipitate, the aluminum hydroxide is colloid, and the aluminum hydroxide and the magnesium hydroxide are filled in the pores of the concrete to provide early strength for the concrete. The embodiment samples 7-9 adopt the combined components, and show better early strength effect compared with the single-component inorganic metal salt of the comparison samples 4-5; comparative sample 6 employs a combination of inorganic metal salts, but is not in a suitable range, so that examples 7 to 9 can exhibit better early strength effects.
In the samples 10-12, only the components of the auxiliary agent are changed, so the early strength effects of the three samples are similar; meanwhile, the sample 12 has more cement stones, and the early strength effect of the sample 12 is slightly better than that of the samples 10-11, which shows that the cement stones can provide better early strength effect when being used as crystal blanks.
In examples 4 to 6, magnesium carbonate was used in example 4, aluminum borate was used in example 5, and magnesium carbonate and aluminum borate were used in example 6. Example 4 can provide better early strength for concrete, but since magnesium carbonate is solid precipitate, the magnesium carbonate can affect the hydration speed and the hydration degree of the concrete in the later period, phosphate is not used as a corrosion inhibition component, and lithium ions can affect the hydration degree of the concrete in the later period, so that example 5-6 can show better later-period compressive strength.
In examples 1-3, magnesium carbonate was used in example 1, and the solid precipitated magnesium hydroxide produced increased the early strength of the concrete, so example 1 had better early strength than examples 2-3, but affected the later hydration level, and made example 2-3 better in the later hydration level. In examples 2 to 3, all the concrete contained aluminum ions and used in combination with reinforcing steel bars were not suitable for use.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (4)
1. The concrete early strength agent is characterized by comprising the following components in parts by weight:
20-50 parts of calcium nitrate;
0.1-0.6 part of triethanolamine;
3-8 parts of aluminum sulfate;
20-40 parts of nano silicon dioxide;
5-10 parts of ethylene glycol;
3-8 parts of water-soluble hydroxide;
the inorganic metal salt comprises (1-3) inorganic metal salt and water-soluble hydroxide in parts by weight: 1;
the water-soluble hydroxide contains 1.3-2 parts of lithium hydroxide;
the metal cations in the inorganic metal salt are magnesium ions and iron ions;
the weight part ratio of the inorganic metal salt to the lithium hydroxide is (2-3): 1;
the concrete early strength agent also comprises 10-17 parts of set cement, and the fineness of the set cement is more than 600 meshes;
the concrete early strength agent also comprises 3-8 parts of calcium lignosulphonate.
2. The concrete early strength agent is characterized by comprising the following components in parts by weight:
20-50 parts of calcium nitrate;
0.1-0.6 part of triethanolamine;
3-8 parts of aluminum sulfate;
20-40 parts of nano silicon dioxide;
5-10 parts of ethylene glycol;
3-8 parts of water-soluble hydroxide;
the inorganic metal salt comprises (1-3) inorganic metal salt and water-soluble hydroxide in parts by weight: 1;
the water-soluble hydroxide contains 1.3-2 parts of lithium hydroxide;
the metal cations in the inorganic metal salt are magnesium ions and aluminum ions;
the inorganic metal salt comprises the following components in parts by weight (1.5-4): 1 of aluminum borate and magnesium carbonate;
the weight part ratio of the inorganic metal salt to the lithium hydroxide is (2-3): 1;
the concrete early strength agent also comprises 10-17 parts of set cement, and the fineness of the set cement is more than 600 meshes;
the concrete early strength agent also comprises 3-8 parts of calcium lignosulphonate.
3. The preparation method of the concrete early strength agent as claimed in claim 1 or 2, characterized by comprising the following steps:
s1: uniformly mixing and stirring calcium nitrate, triethanolamine, aluminum sulfate, nano silicon dioxide, ethylene glycol and an auxiliary agent to form a mixture A;
s2: adding water-soluble hydroxide and inorganic metal salt into the mixture A, and uniformly mixing;
the auxiliary agent in the step S1 comprises set cement and calcium lignosulfonate.
4. The method for preparing the concrete early strength agent according to the claim 3, wherein in the step S1, the mixture A is formed by stirring at the temperature of 25-35 ℃ for 15-25 min; in S2, the temperature of mixture a is lowered to 5 to 15 ℃ before the water-soluble hydroxide and the inorganic metal salt are added to mixture a.
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| CN113637174B (en) * | 2021-07-22 | 2022-09-02 | 湖北工业大学 | Concrete toughness-enhanced chain alkanolamine ferric salt composition and preparation method thereof |
| CN114213133B (en) * | 2021-12-29 | 2023-04-25 | 亚细亚建筑材料股份有限公司 | Additive for improving green strength and preparation method and application thereof |
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