CN107235650B - Water-based nano composite early strength additive and preparation method thereof - Google Patents
Water-based nano composite early strength additive and preparation method thereof Download PDFInfo
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- CN107235650B CN107235650B CN201710533326.4A CN201710533326A CN107235650B CN 107235650 B CN107235650 B CN 107235650B CN 201710533326 A CN201710533326 A CN 201710533326A CN 107235650 B CN107235650 B CN 107235650B
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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 water-based nano composite early strength admixture and a preparation method thereof, wherein the water-based nano composite early strength admixture is prepared from the following components in percentage by weight: 1 to 4 percent of soluble silicate, 1.4 to 7 percent of soluble calcium salt, 0 to 0.5 percent of sodium carbonate, 5 to 20 percent of high molecular polymer dispersant and the balance of water. The water-based nano composite early-strength admixture is simple in preparation process and good in product stability, can effectively improve the early strength of concrete, improves the compressive strength of mortar in 12h and 24h by more than 30% and 16% respectively compared with the compressive strength of common commercial early-strength polycarboxylic acid water reducing agents, and does not influence the later strength.
Description
Technical Field
The invention belongs to the technical field of chemical building materials, and relates to a water-based nano composite early strength additive 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. The production of prefabricated parts requires that concrete has a fast hydration rate and early strength development. The common portland cement is slow in hydration reaction, and due to the fact that a large amount of mineral powder and fly ash are used, the early strength development of the concrete is difficult to meet the design requirement, and technological processes such as turnover of a mold and prestress loading are directly influenced. The development of the early concrete reinforcing technology can greatly improve the production efficiency, save the energy consumption and have remarkable economic and social benefits.
At present, the domestic technical method for improving the early strength of concrete mainly comprises the following steps: (1) the method has certain effects of improving the content of cement clinker, increasing the fineness of cement and raising the steam curing temperature, but can greatly increase the energy consumption on one hand and influence the later strength development and durability of concrete to a certain extent on the other hand. (2) And (4) adding an early strength agent. The existing common early strength agent cannot meet the early strength effect before 12h hydration, and the workability of concrete is influenced by too high mixing amount. In addition, the early strength agent containing chloride and sulfate can cause serious corrosion to the reinforcing steel bars and even reduce the durability of concrete. The novel early strength type polycarboxylate alkaline water agent prepared by molecular structure design can improve the early strength of concrete to a certain extent. For example, patent CN105199060A discloses a super early strength polycarboxylate water reducer and a preparation method thereof, which introduces an active macromonomer with cationic charge property into the structure of the water reducer to promote the hydration reaction of cement and accelerate the strength development of hardened concrete. The preparation of the active macromonomer needs to be carried out for a long time under the conditions of high temperature and high pressure, and has higher requirements on reaction equipment and preparation technology.
Due to the quantum size effect, the surface effect and the macroscopic quantum tunneling effect, the nano material has a plurality of unique application properties in the field of cement concrete. An important article of the innovation Mechanisms of tricosium silicate and center was published in 2009 by Thomas et al in J.Phys.chem.C. abroad, and nano C-S-H to C was studied3S and hydration heat reaction of cement, and the nano C-S-H is found to have a crystal nucleus effect and have an important acceleration effect on early hydration of cement minerals. Then Lee et al further studied nano TiO based on Thomas' work2To C3Effect of hydration Rate of S Influence of TiO2Nanoparticle on Early C3S corporation, similar results were obtained. Generally, the hydration reaction of cement is controlled by nucleation and crystal growth speed, and one of the main reasons for low early hydration reaction rate is lack of crystal nucleus of hydration product, resulting in prolonged hydration induction period. At present, materials such as nano silicon dioxide, nano calcium carbonate, nano calcium silicate hydrate and the like are widely applied to cement concrete to achieve the effects of early strengthening and improving the durability of the concrete, but the powdery nano material is high in price and difficult to uniformly disperse in the concrete, so that the application effect of the powdery nano material is influenced. On the one hand, the effect of dispersing the nano powder material is limited by adopting the common polymer dispersing agent, on the other hand, the cement hydration is inhibited due to the surface adsorption effect, the concrete setting time is prolonged, and the early reinforcing purpose cannot be achieved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a water-based nano composite early strength additive and a preparation method thereof aiming at the defects in the prior art. The water-based nano composite early-strength admixture is simple in preparation process and good in dispersion stability, can effectively improve the early strength of concrete, and improves the compressive strength of mortar in 12h and 24h by more than 30% and 16% respectively compared with the commercial early-strength polycarboxylic acid water reducing agent, and meanwhile, does not influence the later strength.
The technical scheme adopted by the invention for solving the problems is as follows:
the water-based nano composite early strength additive is prepared from the following components in percentage by weight: 1 to 3 percent of soluble silicate, 1.4 to 5.5 percent of soluble calcium salt, 0 to 0.5 percent of sodium carbonate, 5 to 20 percent of high molecular polymer dispersant and the balance of water.
According to the scheme, the structural formula of the high molecular polymer dispersant is shown as the formula (1):
wherein n is an integer of 53 to 112, a: b: c: d: 1 to 6: 0.1 to 1: 0.2 to 1: 1; r1，R4And R5Is selected from H or CH3Etc.; r2Selected from H, K or Na, etc.; r3A hydrocarbon group having a molecular weight of 1000 or less selected from the group consisting of n-hexyl group, cyclohexyl group, isobutyl group, phenyl group, benzyl group and the like; and R is1，R2，R3，R4And R5Are independent of each other.
According to the scheme, the soluble silicate is selected from one or a mixture of several of sodium silicate, sodium metasilicate, sodium fluosilicate and the like according to any proportion.
According to the scheme, the soluble calcium salt is one or a mixture of more of calcium nitrate, calcium formate, calcium acetate and the like according to any proportion.
The preparation method of the aqueous nano composite early strength additive comprises the following steps:
(1) weighing the following raw materials in proportion: soluble silicate, soluble calcium salt, sodium carbonate, high molecular polymer dispersant and water for later use; then, preparing water solutions of soluble silicate, soluble calcium salt, sodium carbonate and high molecular polymer by using raw material water respectively, wherein the total amount of water in each solution is the total amount of the raw material water;
(2) adjusting the pH value of an aqueous solution of a high-molecular polymer dispersant to 7-8 by using an alkali liquor, controlling the temperature to be 30-50 ℃, and then respectively dropwise adding aqueous solutions of soluble calcium salt and sodium carbonate while stirring for 0-2 h; and after the dropping of the aqueous solution of the sodium carbonate is finished, preserving the heat for 0.5-1.5 h, then dropping the aqueous solution of the silicate, keeping the temperature for 6-10 h, and continuing preserving the heat for 1-2 h to obtain the aqueous nano composite early-strength admixture.
According to the scheme, in the step (1), the mass concentration of the aqueous solution of the soluble silicate is 1-12%, the mass concentration of the aqueous solution of the soluble calcium salt is 3-22%, the mass concentration of the aqueous solution of the sodium carbonate is 1.5-2.5%, and the mass concentration of the aqueous solution of the high molecular polymer is 5-40%. .
According to the scheme, the alkali liquor in the step (2) mainly adopts a sodium hydroxide solution with the mass concentration of 20-40%.
Compared with the prior art, the invention has the beneficial effects that:
1. the water-based nano composite early-strength admixture prepared by the invention can improve the strength of concrete in 12h and earlier ages, and the compressive strength of mortar in 12h and 24h is respectively improved by more than 30% and 16% compared with that of the common commercial early-strength polycarboxylic acid water reducing agent.
2. The aqueous nano composite early strength admixture prepared by the invention is safe and easy to use without adding any inorganic salt which has influence on the durability of concrete.
3. According to the aqueous nano-composite early-strength additive prepared by the invention, the adopted high-molecular polymer dispersant has better dispersibility and early-strength effect, and on one hand, a certain amount of sulfonic functional groups are introduced into the structure of the additive, and the groups have stronger electronegativity than common carboxyl groups, so that the electronegativity of the polymer can be further improved on the basis of carboxyl groups, and thus the electrostatic repulsion effect among cement particles is enhanced, the cement particles are dispersed more uniformly and hydrated more fully, and the early strength of concrete is further improved; on the other hand, the polymer structure also contains a certain amount of amphoteric amide groups, lone pair electrons carried on nitrogen atoms in the amide group molecular structure are easy to generate complex reaction with free calcium and iron ions in the cement slurry to generate a complex with higher water solubility, and the hydration of aluminate mineral phases and the generation of ettringite in the cement can be promoted, so that the hydration process of the cement is further accelerated, and the early strength development of the concrete is promoted.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the content of the present invention, but the content of the present invention is not limited to the following examples.
According to the invention, a high molecular polymer dispersant is prepared by adopting an aqueous solution free radical copolymerization method, corresponding unsaturated monomer raw materials, a molecular weight control agent and deionized water are respectively added into a four-neck flask provided with a mechanical stirrer and a thermometer, a persulfate initiator solution is slowly dripped under a constant temperature condition after uniform stirring, and the unsaturated monomer undergoes a free radical copolymerization reaction for 4 hours, so that the high molecular polymer dispersant can be prepared.
The following description will specifically explain the preparation process of the polymeric dispersant used in example 1 as follows:
34.4g of methacrylic acid, 4.3g of maleic acid monoamide, 3.2g of sodium methallylsulfonate, 400g of allyl polyoxyethylene ether, 1.7g of thioglycolic acid and 538g of deionized water are respectively and sequentially added into a four-neck flask provided with a stirrer and a thermometer, the raw materials are uniformly stirred under the condition of water bath at the temperature of 60 ℃, then an initiator solution consisting of 6.6g of ammonium persulfate and 137.3g of deionized water is slowly dripped for 3 hours, and then heat preservation is carried out for 1 hour, so that a high polymer dispersing agent solution with the solid content of about 40 percent can be obtained. The high molecular polymer dispersant solution can be diluted by adding water as required.
Example 1
The water-based nano composite early strength additive is characterized by comprising the following substances in percentage by weight: 1% of sodium silicate, 1.4% of calcium nitrate, 0.075% of sodium carbonate, 5% of high-molecular polymer dispersant and the balance of water, and the preparation method comprises the following steps:
(1) putting 50g of a 10% polymer dispersant solution into a reaction kettle, adjusting the pH value to 7-8 with 30% sodium hydroxide, and controlling the water bath temperature to be 30 ℃;
(2) and (2) respectively dropwise adding 25g of calcium nitrate aqueous solution (with the concentration of 5.6%) and 5g of sodium carbonate aqueous solution (with the concentration of 1.5%) into the solution obtained in the step (1) while stirring, keeping the temperature for 1 hour after the sodium carbonate is dropwise added for about 2 hours, then dropwise adding 20g of sodium silicate aqueous solution (with the concentration of 5%) into the reaction kettle at a constant speed, keeping the temperature for 8 hours, and thus obtaining the aqueous nano composite early strength additive.
The high molecular weight polymer dispersant selected in this example has an average molecular weight of about 45000, as determined by GPC, and the structural formula is as follows:
wherein n is 90-92, a: b: c: d: 4:0.2:0.3: 1.
The solid content of the early strength admixture for the water-based nano composite concrete obtained by the embodiment is about 8%, and no obvious precipitation is generated after standing for 60 days at room temperature.
Example 2
The water-based nano composite concrete early strength admixture is characterized by comprising the following substances in percentage by weight: 3% of sodium silicate, 5.5% of calcium nitrate, 20% of high molecular polymer dispersant and the balance of water, wherein the preparation method comprises the following steps:
(1) 50g of a high molecular polymer dispersant solution with the mass fraction of 40% is put into a reaction kettle, the pH value of the reaction kettle is adjusted to 7-8 by 30% sodium hydroxide, and the water bath temperature is controlled at 30 ℃;
(2) and (2) respectively dropwise adding 25g of calcium nitrate aqueous solution (with the concentration of 22%) and 25g of sodium silicate aqueous solution (with the concentration of 12%) into the solution obtained in the step (1) while stirring, wherein the dropwise adding time is 12 hours, and continuously preserving the heat for 2 hours to obtain the aqueous nano composite early-strength admixture.
The high molecular weight polymer dispersant selected in this example has an average molecular weight of about 40000 as measured by GPC, and the structural formula is:
wherein n is 80-82, a: b: c: d: 4.5:0.2:0.35: 1. .
The solid content of the early strength admixture for the water-based nano composite concrete obtained in the embodiment is about 29%, and no obvious precipitation is generated after standing for 60 days at room temperature.
Example 3
The water-based nano composite early strength additive is characterized by comprising the following substances in percentage by weight: 2.1% of sodium silicate, 1.5% of calcium nitrate, 1.7% of calcium formate, 0.125% of sodium carbonate, 18% of high molecular polymer dispersant and the balance of water, and the preparation method comprises the following steps:
(1) 50g of a high molecular polymer dispersant solution with the mass fraction of 36% is put into a reaction kettle, the pH value is adjusted to 7-8 by 30% of sodium hydroxide, and the water bath temperature is controlled at 40 ℃;
(2) and (2) respectively dropwise adding 25g of soluble calcium salt aqueous solution (wherein the concentration of calcium nitrate is 6% and the concentration of calcium formate is 6.8%) and 5g of sodium carbonate aqueous solution (the concentration is 2.5%) into the solution obtained in the step (1) while stirring, keeping the temperature for 2 hours after the sodium carbonate is dropwise added, keeping the temperature for 1 hour, then dropwise adding 20g of sodium silicate aqueous solution (the concentration is 10.5%) into the reaction kettle at a constant speed, keeping the temperature for 2 hours after the sodium carbonate is dropwise added, and thus obtaining the aqueous nano composite early-strength admixture.
The high molecular weight polymer dispersant selected in this example has an average molecular weight of about 60000 as measured by GPC, and the structural formula is:
wherein n is 73-76, a: b: c: d: 3.5:0.1:0.3: 1.
The solid content of the aqueous nano-composite type early-strength admixture obtained in the embodiment is about 24%, and no obvious precipitate exists after standing at room temperature for 60 days.
Example 4
The water-based nano composite early strength additive is characterized by comprising the following substances in percentage by weight: 1 percent of sodium silicate, 1.6 percent of sodium fluosilicate, 3.5 percent of calcium nitrate, 15 percent of high molecular polymer dispersant and the balance of water, and the preparation method comprises the following steps:
(1) 50g of a 30% polymer dispersant solution is put into a reaction kettle, the pH value of the reaction kettle is adjusted to 7-8 by 30% sodium hydroxide, and the water bath temperature is controlled at 40 ℃;
(2) and (2) respectively dropwise adding 25g of calcium nitrate aqueous solution (with the concentration of 14%) and 25g of soluble silicate aqueous solution (with the concentration of 4% of sodium silicate and 6.4% of sodium fluosilicate) into the solution obtained in the step (1) while stirring, wherein the dropwise adding time is about 10 hours, and continuously keeping the temperature for 2 hours to obtain the aqueous nano composite early-strength additive.
The high molecular weight polymer dispersant selected in this example has an average molecular weight of about 50000 measured by GPC, and the structural formula is:
wherein n is 53-55, a: b: c: d: 3.0:0.2:0.3: 1.
The solid content of the early strength admixture for the water-based nano composite concrete obtained in the embodiment is about 21%, and no obvious precipitation is generated after standing for 60 days at room temperature.
Example 5
The water-based nano composite early strength additive is characterized by comprising the following substances in percentage by weight: 1% of sodium silicate, 0.8% of sodium fluosilicate, 0.7% of sodium metasilicate, 2.5% of calcium nitrate, 1% of calcium acetate, 20% of high molecular polymer dispersant and the balance of water, wherein the preparation method comprises the following steps:
(1) 50g of a polymer dispersant solution with the mass fraction of 40% is put into a reaction kettle, the pH value of the reaction kettle is adjusted to 7-8 by 30% sodium hydroxide, and the water bath temperature is controlled at 50 ℃;
(2) and (2) respectively dropwise adding 25g of soluble calcium salt aqueous solution (wherein the concentration of calcium nitrate is 10% and the concentration of calcium acetate is 4%) and 25g of soluble silicate aqueous solution (wherein the concentration of sodium silicate is 4%, the concentration of sodium fluosilicate is 3.2% and the concentration of sodium metasilicate is 2.8%) into the solution obtained in the step (1) while stirring, wherein the dropwise adding time is 12 hours, and continuously keeping the temperature for 2 hours to obtain the aqueous nano composite early strength additive.
The polymeric dispersant selected in this example has an average molecular weight of about 58000 as determined by GPC, and has the following structural formula:
wherein n is 53-55, a: b: c: d is 5.0:0.2:0.35: 1.
The solid content of the early strength admixture for the water-based nano composite concrete obtained in the embodiment is about 26%, and no obvious precipitation is generated after standing for 60 days at room temperature.
Example 6
The water-based nano composite early strength additive is characterized by comprising the following substances in percentage by weight: 2.1% of sodium silicate, 3.5% of calcium nitrate, 0.8% of calcium formate, 0.1% of sodium carbonate, 20% of high molecular polymer dispersant and the balance of water, and the preparation method comprises the following steps:
(1) 50g of a polymer dispersant solution with the mass fraction of 40% is put into a reaction kettle, the pH value of the reaction kettle is adjusted to 7-8 by 30% sodium hydroxide, and the water bath temperature is controlled at 50 ℃;
(2) and (2) respectively dropwise adding 25g of soluble calcium salt aqueous solution (wherein the concentration of calcium nitrate is 14% and the concentration of calcium formate is 3.2%) and 5g of sodium carbonate aqueous solution (the concentration is 2%) into the solution obtained in the step (1) while stirring, continuously preserving heat for 1h after the dropwise adding of sodium carbonate is finished, then dropwise adding 21g of sodium silicate aqueous solution (the concentration is 10%) into the reaction kettle at a constant speed, dropwise adding for 8h, and continuously preserving heat for 2h to obtain the aqueous nano composite early-strength admixture.
The polymeric dispersant selected for use in this example had an average molecular weight of about 52000 by GPC, and the formula is as follows:
wherein n is 53-55, a: b: c: d is 6:0.3:0.5: 1.
The solid content of the early strength admixture for the water-based nano composite concrete obtained in the embodiment is about 27%, and no obvious precipitation is generated after standing for 60 days at room temperature.
Application examples
The aqueous nano-composite early strength admixtures (numbered as A1, A2, A3, A4, A5 and A6 in sequence) prepared in examples 1 to 6 were subjected to cement mortar strength test respectively (refer to national standard GB 17671-1999).
When in detection: the dosage of the test cement is 450g, the standard sand is 1350g, the effective solid mass of the added early strength admixture is 0.85g, and the water-to-gel ratio is 0.37. Uniformly stirring the mortar mixture doped with the early strength additive, then loading the mortar mixture into a prism test mold with the thickness of 40mm multiplied by 160mm in two layers, placing the mortar test mold into a curing box after vibrating and compacting, curing the mortar test mold to a test age in an environment with the temperature of 20 +/-1 ℃ and the humidity of more than or equal to 90 percent, and then testing the strength of the demolded mortar test block according to the requirements of national standard GB 17671-1999. And selecting commercial early strength type polycarboxylate superplasticizers with different solid contents as controls, wherein the numbers of the commercial early strength type polycarboxylate superplasticizers are B1, B2 and B3 respectively, and the controls are doped into the mortar with the same effective solid content for testing. The results of the early strength test of the cement mortar are shown in table 1.
TABLE 1 comparison of aqueous nanocomposite early strength admixtures with commercially available product Properties
As can be seen from Table 1, the compressive strength of the aqueous nano composite early strength admixture is at least more than 30 percent higher than that of the 12h mortar of the common commercial early strength polycarboxylate superplasticizer product (wherein the A2 group is higher than the B2 group by 30 percent in 12h strength); the compressive strength of the mortar is at least 16% higher after 24h (wherein the strength of the A2 group is 16% higher than that of the B3 group after 12 h); the 3d mortar compressive strength is at least 18 percent higher (wherein the A2 group has 18 percent higher strength than the B2 group 3 d); the 7d mortar compressive strength is at least 16.6% higher (wherein the A2 group has 16.6% higher strength than the B2 group 3 d).
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and changes can be made without departing from the inventive concept of the present invention, and these modifications and changes are within the protection scope of the present invention.
Claims (7)
1. The aqueous nano composite early strength additive is characterized by comprising the following components in percentage by weight: 1 to 4 percent of soluble silicate, 1.4 to 7 percent of soluble calcium salt, 0 to 0.5 percent of sodium carbonate, 5 to 20 percent of high molecular polymer dispersant and the balance of water; the structural formula of the high molecular polymer dispersant is shown as the formula (1):
in the formula (1), n is an integer between 53 and 112, a: b: c: d ═ 1 to 6: 0.1 to 1: 0.2 to 1: 1; r1，R4And R5Is H or CH3；R2Is H, K or Na; r3Is a hydrocarbon group with a molecular weight of 1000 or less; and R is1，R2，R3，R4And R5Are independent of each other;
the preparation method of the aqueous nano composite early strength additive comprises the following steps:
(1) weighing the following raw materials in proportion: soluble silicate, soluble calcium salt, sodium carbonate, high molecular polymer dispersant and water for later use; then, preparing water solutions of soluble silicate, soluble calcium salt, sodium carbonate and high molecular polymer by using raw material water respectively, wherein the total amount of water in each solution is the total amount of the raw material water;
(2) adjusting the pH of an aqueous solution of a high-molecular polymer dispersant to 7-8 by using an alkali liquor, and then respectively dropwise adding aqueous solutions of soluble calcium salt and sodium carbonate while stirring, wherein the dropwise adding time is 0-2 h; and after the dropping of the aqueous solution of the sodium carbonate is finished, preserving the heat for 0.5-1.5 h, then dropping the aqueous solution of the silicate for 6-10 h, and continuously preserving the heat for 1-2 h to obtain the aqueous nano composite early-strength admixture.
2. The aqueous nano-composite type early strength admixture according to claim 1, characterized in that the soluble silicate is selected from one or a mixture of several of sodium silicate, sodium metasilicate and sodium fluorosilicate according to any proportion.
3. The aqueous nano-composite early-strength admixture according to claim 1, characterized in that the soluble calcium salt is selected from one or a mixture of several of calcium nitrate, calcium formate and calcium acetate according to any proportion.
4. The preparation method of the aqueous nano-composite type early strength admixture according to claim 1, characterized by comprising the following steps:
(1) weighing the following raw materials in proportion: soluble silicate, soluble calcium salt, sodium carbonate, high molecular polymer dispersant and water for later use; then, preparing water solutions of soluble silicate, soluble calcium salt, sodium carbonate and high molecular polymer by using raw material water respectively, wherein the total amount of water in each solution is the total amount of the raw material water;
(2) adjusting the pH of an aqueous solution of a high-molecular polymer dispersant to 7-8 by using an alkali liquor, and then respectively dropwise adding aqueous solutions of soluble calcium salt and sodium carbonate while stirring, wherein the dropwise adding time is 0-2 h; and after the dropping of the aqueous solution of the sodium carbonate is finished, preserving the heat for 0.5-1.5 h, then dropping the aqueous solution of the silicate for 6-10 h, and continuously preserving the heat for 1-2 h to obtain the aqueous nano composite early-strength admixture.
5. The preparation method of the aqueous nano composite early-strength additive according to claim 4, wherein in the step (1), the mass concentration of the aqueous solution of the soluble silicate is 1-12%, the mass concentration of the aqueous solution of the soluble calcium salt is 3-22%, the mass concentration of the aqueous solution of the sodium carbonate is 1.5-2.5%, and the mass concentration of the aqueous solution of the high molecular polymer dispersant is 5-40%.
6. The preparation method of the aqueous nano-composite early-strength additive according to claim 4, characterized in that the alkali liquor mainly adopts a sodium hydroxide solution with a mass concentration of 20-40%.
7. The preparation method of the aqueous nano-composite type early strength admixture according to claim 4, wherein the temperature in the step (2) is controlled to be 30-50 ℃.
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| CN110981269A (en) * | 2019-12-31 | 2020-04-10 | 上海三瑞高分子材料股份有限公司 | Cement early strength agent composition and preparation method thereof |
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| CN113548828B (en) * | 2021-08-05 | 2022-06-07 | 中建西部建设建材科学研究院有限公司 | Nanocrystal core early strength agent and preparation method thereof |
| CN114057425B (en) * | 2021-10-16 | 2023-03-17 | 江苏博拓新型建筑材料股份有限公司 | Method for preparing polycarboxylic acid nanocrystalline core type early strength water-reducing complexing agent |
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