CN111423155A - A kind of early strength water reducing agent and preparation method thereof - Google Patents

Abstract

The invention relates to the technical field of concrete admixtures, and relates to an early-strength water-reducing agent and a preparation method thereof, comprising the following components and parts by mass: 65-85 parts of deionized water and 50-55 parts of polycarboxylic acid-based water-reducing agent , 15-20 parts of tree ash powder, 10-16 parts of sepiolite powder, 3-7 parts of triethanolamine and 1-3 parts of defoamer; preparation step: S1, deionized water of corresponding mass parts, polycarboxylic acid system Mix the water reducing agent and triethanolamine, uniformly stir for 5-10min under the condition of 30-35 ℃, obtain mixture A; S2, add corresponding mass parts of tree ash, sepiolite powder and hollow glass microbeads to mixture A while stirring , to prepare mixture B; S3, adding a corresponding mass of defoaming agent to mixture B, and stirring to obtain an early-strength water-reducing agent; the early-strength water-reducing agent provided by the invention has the advantages of good dispersibility, and can improve the early strength of concrete. Strength enhancement.

Description

A kind of early strength water reducing agent and preparation method thereof

technical field

The invention relates to the technical field of concrete admixtures, and more particularly, to an early-strength water-reducing agent and a preparation method thereof.

Background technique

Concrete admixtures refer to substances added to improve concrete performance before or during concrete mixing. Because admixtures can effectively improve the performance of concrete and have good economic benefits, they have been widely used in many countries, and their application in engineering has received more and more attention, becoming an indispensable material in concrete. Early-strength water reducer is an admixture that accelerates the early strength development of concrete, which can promote the hydration and hardening of cement and shorten the curing period of concrete.

Early-strength polycarboxylate water-reducing agent is a commonly used water-reducing agent, but in the process of preparing concrete, early-strength polycarboxylate water-reducing agent has poor dispersibility in the concrete raw material system, which easily leads to The early-strength polycarboxylate superplasticizer does not significantly improve the early strength of concrete, so there is still room for improvement.

SUMMARY OF THE INVENTION

The first object of the present invention is to provide an early-strength water-reducing agent, which has the advantages of good dispersibility and is beneficial for improving the early strength of concrete.

For realizing the first purpose, the present invention provides the following technical solutions:

An early-strength water-reducing agent, comprising the following components expressed in parts by mass:

65-85 parts of deionized water

50-55 parts of polycarboxylate water reducer

15-20 parts of tree ash powder

10-16 servings of sepiolite powder

3-7 parts of triethanolamine

1-3 parts of defoamer.

Using the above technical solution, deionized water, polycarboxylate tree-based water-reducing agent and triethanolamine are combined to form the main components of the early-strength water-reducing agent. The early-strength water-reducing agent can be better and uniformly dispersed in the concrete raw material system, which is beneficial to make the early-strength water-reducing agent improve the early strength strength of concrete better; the addition of sepiolite powder is conducive to further improving the early strength reduction. The early strength of water agent to concrete; at the same time, the combination of sepiolite powder and tree ash powder is beneficial to make sepiolite powder more evenly distributed in the raw material system of early strength water reducer, which is conducive to making early strength water reducer. The effect of improving the early strength of concrete is better; the addition of defoamer is beneficial to improve the problem of multi-bubble in the early strength superplasticizer, and it is beneficial to reduce the air content of the early strength superplasticizer, so that the early strength superplasticizer can Improve the compactness of concrete.

Further, described tree ash powder is modified tree ash powder, and the preparation method of described modified tree ash powder is as follows:

(1) after soaking the tree ash powder with a sodium hydroxide solution whose volume fraction is 10-15% for 2-3 hours;

(2) Soak with 10-15% hydrochloric acid solution for 2-3 hours;

(3) washing repeatedly with deionized water until the tree ash powder is neutral, drying;

(4) grinding to a powder with a particle size of 0.8-1.2 μm to obtain a modified tree ash powder.

Using the above technical solution, the tree ash powder is first soaked in sodium hydroxide solution for 2-3 hours, then soaked in hydrochloric acid for 2-3 hours, and finally washed and ground to obtain modified tree ash powder. It can significantly improve the compatibility between tree ash powder, polycarboxylate superplasticizer, sepiolite powder and triethanolamine, and at the same time, it is beneficial to further enhance the dispersibility of early-strength superplasticizer and the compatibility with concrete. It is beneficial to further improve the effect of early strength water reducer on the early strength strength of concrete as a whole; at the same time, the particle size of tree ash powder is controlled between 0.8-1.2μm, so that when the early strength water reducer is added to concrete , the tree ash powder in the superplasticizer can be further filled in the gaps of the coarse aggregates in the concrete, which is beneficial to improve the compactness of the concrete, thereby helping to improve the impermeability of the concrete, which in turn is conducive to making the concrete durable. .

Further, the sepiolite powder needs to be pretreated, and the pretreatment method is as follows:

First soak the corresponding mass of sepiolite with a volume fraction of 15-20% hydrochloric acid for 1-2 hours, let stand, clarify, centrifuge, wash with deionized water until neutral, after drying, add 3- 5% vinyltriethoxysilane is stirred uniformly, dried, and pulverized into powder.

Further, the mesh number of the sepiolite powder is 400-800 mesh.

By adopting the above technical solution, the sepiolite is soaked in hydrochloric acid, which is beneficial to increase the specific surface area of the sepiolite, and the internal channels of the sepiolite are connected, which makes the sepiolite easily adsorb the tree ash in the early-strength superplasticizer. Powder and other components, tree ash powder makes sepiolite easily and uniformly dispersed in the raw material system of early-strength water-reducing agent, which is conducive to making the early-strength water-reducing agent to improve the early strength of concrete better; The uniform mixing of the stone and vinyltriethoxysilane is conducive to the compatibility between sepiolite and other components in the early-strength superplasticizer, and is also conducive to improving the early-strength superplasticizer and other components in the concrete. The compatibility of the early-strength water-reducing agent further improves the early-strength and water-reducing effects of the early-strength water-reducing agent on concrete.

Further, the early-strength water-reducing agent also includes 5-12 parts by mass of hollow glass microspheres.

Further, the average particle size of the hollow glass microspheres is 20-25 μm.

Using the above technical solution, the addition of hollow glass microspheres is beneficial to improve the fluidity of the early-strength water-reducing agent, and the hollow glass micro-spheres and tree ash powder play a synergistic effect, which is conducive to making the early-strength water-reducing agent more easily and uniformly dispersed in in the raw material system of concrete.

Further, the early strength water reducing agent includes the following components expressed in parts by mass:

68-85 parts of deionized water

51-55 parts of polycarboxylate water reducer

16-20 parts of tree ash powder

11-16 servings of sepiolite powder

5-12 parts of hollow glass beads

3.5-7 parts of triethanolamine

Defoamer 1.3-3 parts.

Further, the early strength water reducing agent includes the following components expressed in parts by mass:

76 parts of deionized water

53 parts of polycarboxylate water reducer

18 parts of tree ash powder

13 servings of sepiolite powder

9 parts of hollow glass beads

4.5 parts of triethanolamine

2 parts of defoamer.

By adopting the above technical scheme, the early-strength water-reducing agent prepared by each component according to a specific ratio has better early-strength-enhancing effect and impermeability of concrete, so that the early-strength strength and durability of concrete are better.

The second object of the present invention is to provide a preparation method of an early-strength water-reducing agent, and the prepared early-strength water-reducing agent can better improve the early strength of cement concrete.

For realizing the second purpose, the present invention provides the following technical solutions:

A preparation method of an early-strength water-reducing agent, comprising the following steps:

S1, mix the corresponding mass parts of deionized water, polycarboxylic acid-based water reducing agent and triethanolamine, and uniformly stir for 5-10min under the condition of 30-35°C to obtain mixture A;

S2, adding corresponding mass parts of tree ash powder, sepiolite powder and hollow glass microbeads to mixture A while stirring to prepare mixture B;

S3. Add a corresponding mass of defoamer to mixture B, and stir for 10-15 minutes to obtain an early-strength water-reducing agent.

By adopting the above technical solution, the above-mentioned components are prepared according to a specific preparation method to obtain an early-strength water-reducing agent, which has good dispersibility, so that the early-strength water-reducing agent can improve the early strength and durability of concrete. Better results.

To sum up, the present invention has the following beneficial effects:

1. Deionized water, polycarboxylate tree-based water-reducing agent and triethanolamine form the main components of early-strength water-reducing agent. The addition of tree ash powder is conducive to improving the dispersibility of early-strength water-reducing agent and making early-strength water-reducing agent. The water-reducing agent can be better dispersed in the concrete raw material system, which is conducive to making the early-strength water-reducing agent better improve the early-strength strength of concrete; the addition of sepiolite powder is conducive to further improving the The early strength of concrete; at the same time, the combination of sepiolite powder and tree ash powder is conducive to making the sepiolite powder more evenly distributed in the raw material system of the early strength water reducing agent, which is conducive to making the early strength water reducing agent effective for concrete. The effect of improving the strength is better; the addition of defoamer is beneficial to improve the problem of multi-bubble in the early-strength water-reducing agent, and it is beneficial to reduce the air content of the early-strength water-reducing agent, so that the early-strength water-reducing agent can improve the performance of concrete. degree of compactness.

2. Soaking the sepiolite with hydrochloric acid is beneficial to increase the specific surface area of the sepiolite, and the internal channels of the sepiolite are connected, which makes the sepiolite easy to adsorb the components such as tree ash powder in the early-strength superplasticizer. , the tree ash powder makes the sepiolite easily and uniformly dispersed in the raw material system of the early-strength water-reducing agent, which is conducive to making the early-strength water-reducing agent improve the early strength of concrete better; at the same time, sepiolite and ethylene The uniform mixing of triethoxysilane is conducive to the compatibility between sepiolite and other components in the early-strength water-reducing agent, and also helps to improve the compatibility of the early-strength water-reducing agent with other components in concrete It can further improve the early strength and water reducing effect of early strength water reducing agent on concrete.

Detailed ways

The present invention will be described in further detail below in conjunction with the embodiments.

In the following examples, the polycarboxylic acid-based water-reducing agent adopts the APEG-type water-reducing agent whose model is APEG600 in the allyl polyether (APEG series) sold by Liaoning Kelong Fine Chemical Co., Ltd., and its appearance is light yellow liquid.

In the following examples, the defoaming agent is polydimethylsiloxane.

In the following examples, the early-strength water reducing agent may also include other conventional auxiliary agents, such as air-entraining agents, etc., the addition of other auxiliary agents will not have a substantial impact on the implementation of the present invention.

All the raw materials used in the present invention are commercially available. The equipment used in the preparation method of the early-strength water reducing agent in the present invention is the equipment conventionally used in the art.

Table 1 Components and mass parts of early-strength water reducing agent.

Example 1

A kind of early strength water reducing agent, its components and mass parts are shown in Table 1. In this embodiment, the mesh number of the sepiolite powder is 200 meshes. The particle size of the tree ash powder is 2.0 μm.

A preparation method of an early-strength water-reducing agent, comprising the following steps:

S1. Mix corresponding mass parts of deionized water, polycarboxylic acid-based water reducing agent and triethanolamine, and uniformly stir for 5 minutes at 30° C. to obtain mixture A.

S2, adding corresponding mass parts of tree ash powder and sepiolite powder to mixture A while stirring to prepare mixture B.

S3, adding corresponding mass parts of defoamer to mixture B, stirring for 10 minutes, to obtain early strength water reducing agent.

Example 2

A kind of early strength water reducing agent, its components and mass parts are shown in Table 1.

In this embodiment, the average particle size of the hollow glass microspheres is 20 μm.

In this embodiment, the mesh number of the sepiolite powder is 325 meshes.

A preparation method of an early-strength water-reducing agent, comprising the following steps:

S1. Mix corresponding mass parts of deionized water, polycarboxylic acid-based water-reducing agent and triethanolamine, and uniformly stir for 8 minutes at 33° C. to obtain mixture A.

S2, adding corresponding mass parts of tree ash powder, sepiolite powder and hollow glass microspheres to mixture A while stirring to prepare mixture B.

S3, adding corresponding mass parts of defoaming agent to mixture B, stirring for 12 minutes, to obtain early strength water reducing agent.

Example 3

A kind of early-strength water reducing agent, the difference from Example 2 is: its components and mass parts are shown in Table 1.

In this example, the average particle size of the hollow glass microspheres is 21 μm.

In the present embodiment, the tree ash powder is modified tree ash powder, and the preparation method of the modified tree ash powder is as follows:

(1) After soaking the tree ash powder in a sodium hydroxide solution with a volume fraction of 10% for 2 hours.

(2) Soak with 10% hydrochloric acid solution for 2 hours.

(3) Wash several times with deionized water until the tree ash powder is neutral, and dry.

(4) grinding to a powder with a particle size of 0.8 μm to obtain a modified tree ash powder.

A preparation method of an early-strength water-reducing agent, comprising the following steps:

S1. Mix corresponding mass parts of deionized water, polycarboxylic acid-based water-reducing agent and triethanolamine, and uniformly stir for 10 minutes at 35° C. to obtain mixture A.

S2, adding corresponding mass parts of tree ash powder, sepiolite powder and hollow glass microspheres to mixture A while stirring to prepare mixture B.

S3, adding corresponding mass parts of defoaming agent to mixture B, stirring for 15 minutes, to obtain early strength water reducing agent.

Example 4

A kind of early-strength water reducing agent, the difference from Example 3 is: its components and mass parts are shown in Table 1.

In this example, the average particle size of the hollow glass microspheres is 22 μm.

In the present embodiment, the tree ash powder is modified tree ash powder, and the preparation method of the modified tree ash powder is as follows:

(1) After soaking the tree ash powder in a sodium hydroxide solution with a volume fraction of 13% for 2.5 hours.

(2) Soak in 13% hydrochloric acid solution for 2.5 hours.

(3) Wash several times with deionized water until the tree ash powder is neutral, and dry.

(4) grinding to a powder with a particle size of 1.0 μm to obtain a modified tree ash powder.

In the present embodiment, the sepiolite powder needs to be pretreated, and the pretreatment method is as follows:

First soak the corresponding mass of sepiolite with 15% hydrochloric acid by volume for 1 hour, let stand, clarify, centrifuge, wash with deionized water until neutral, dry, and add vinyl trisulfite equivalent to 3% by mass of sepiolite. Ethoxysilane is uniformly stirred, dried, and pulverized into powder.

In this embodiment, the mesh number of the sepiolite powder is 400 meshes.

Example 5

A kind of early-strength water reducing agent, the difference from Example 4 is: its components and mass parts are shown in Table 1.

In this example, the average particle size of the hollow glass microspheres is 24 μm.

In the present embodiment, the tree ash powder is modified tree ash powder, and the preparation method of the modified tree ash powder is as follows:

(1) After soaking the tree ash powder with a sodium hydroxide solution with a volume fraction of 15% for 3 hours.

(2) Soak in 15% hydrochloric acid solution for 3 hours.

(3) Wash several times with deionized water until the tree ash powder is neutral, and dry.

(4) grinding to a powder with a particle size of 1.2 μm to obtain a modified tree ash powder.

In the present embodiment, the sepiolite powder needs to be pretreated, and the pretreatment method is as follows:

First soak the corresponding mass of sepiolite with 18% hydrochloric acid by volume for 1.5 hours, let stand, clarify, centrifuge, wash with deionized water until neutral, after drying, add vinyl trisulfite equivalent to 4% by mass of sepiolite Ethoxysilane is uniformly stirred, dried, and pulverized into powder.

In this embodiment, the mesh number of the sepiolite powder is 500 meshes.

Example 6

A kind of early-strength water reducing agent, the difference from Example 5 is: its components and mass parts are shown in Table 1.

In this embodiment, the average particle size of the hollow glass microspheres is 25 μm.

In the present embodiment, the pretreatment method of sepiolite powder is as follows:

First soak the corresponding mass of sepiolite with 20% hydrochloric acid by volume for 2 hours, let stand, clarify, centrifuge, wash with deionized water until neutral, dry, add vinyl trisulfite equivalent to 5% by mass of sepiolite Ethoxysilane is uniformly stirred, dried, and pulverized into powder.

In this embodiment, the mesh number of the sepiolite powder is 800 meshes.

Comparative Example 1

An early strength water reducing agent, the difference from Example 3 is that no tree ash powder is added.

Comparative Example 2

An early strength water reducing agent, the difference from Example 1 is: no sepiolite powder is added.

Comparative Example 3

An early-strength water reducing agent, the difference from Example 5 is that the average particle size of the hollow glass microbeads is 30 μm.

Comparative Example 4

A kind of early-strength water-reducing agent, the difference with embodiment 5 is: the early-strength water-reducing agent comprises the following components represented by mass parts:

76 parts of deionized water

53 parts of polycarboxylate water reducer

12 pcs of tree ash powder

5 servings of sepiolite powder

12 pieces of hollow glass beads

4.5 parts of triethanolamine

2 parts of defoamer.

Performance check:

Performance testing 1. Fluidity testing of cement paste: The early-strength superplasticizers prepared in Examples 1-6 and Comparative Examples 1-4 were mixed into the cement paste respectively, and the corresponding cement paste was set as the sample 1-10, the dosage of early-strength water reducing agent is 1%, and the cement paste includes 1000g cement, 2000g standard sand, 305g water, and the cement is 42.5R cement. Test method" to carry out the slurry fluidity test, and detect the initial fluidity of samples 1-10, the fluidity of the clean slurry after 60min and 120min respectively, and record the test results in Table 2.

Table 2 Test data of performance test 1 for samples 1-10.

Performance test 2. Detection of concrete mechanical properties and durability: The early-strength water-reducing agents prepared by Examples 1-6 and Comparative Examples 1-4 were mixed into concrete respectively, and the corresponding concrete was set as sample 1- 10. The amount of early strength water reducing agent is 1%, cement, fly ash in concrete: mineral powder: sand: stone: water = 190:80:80:1000:840:160, cement is 42.5R cement, powder The coal ash is secondary fly ash, the mud content of the medium sand is 2.2%, the fineness modulus is 2.6, the mud content of the stone is 0.5%, the particle size is 5-25mm, the stirring time is 90 seconds, and the vibrating time is 90 seconds. The time is 15 seconds, cured for 12 hours at (20±3) ℃, and the standard test block is made after demoulding. The properties of concrete are tested according to the following standards, and the test results are recorded in Table 3.

1. Compressive strength: GB/T50081-2002 "Standards for Test Methods of Mechanical Properties of Ordinary Concrete" for testing.

2. Water reduction rate: GB/T8076-2008 "Concrete Admixtures" for testing.

3. Impermeability: Test the impermeability grades of samples 1-10 by the step-by-step compression method in GB/T 50082-2009 "Standards for Long-term Performance and Durability of Ordinary Concrete".

4. Corrosion of steel bars: GB/T 50082-2009 "Standards for Test Methods for Long-term Performance and Durability of Ordinary Concrete" for testing.

Table 3 Test data of performance test 2 for samples 1-10.

Sample 2 added hollow glass beads, while sample 1 did not add hollow glass beads. From the data in Table 2 and Table 3, it can be known that the early strength and impermeability of sample 2 are better than those of sample 1. The early strength and impermeability are good, which shows that the addition of hollow glass microspheres is beneficial to improve the fluidity of early strength water reducing agent. It is easier to disperse the agent evenly in the raw material system of the concrete, so that the fluidity of the concrete is better.

The average particle size of the hollow glass microspheres of sample 9 is controlled at 30 μm, and the average particle size of the hollow glass microspheres of samples 2-6 is 20 μm. Hollow glass microspheres are beneficial to fill the pores in the coarse aggregate in concrete, thereby improving the impermeability of concrete.

Sample 7 is no tree ash powder added. Compared with sample 7, the early strength strength and water reduction rate of sample 3 are worse than those of sample 7, which shows that the tree The addition of ash powder is beneficial to improve the dispersibility of the early-strength water-reducing agent, and it is beneficial to make the early-strength water-reducing agent better and uniformly disperse in the concrete raw material system, so that the water-reducing effect of the early-strength water-reducing agent on concrete is improved. It is better, and at the same time, it is beneficial to make the early-strength water reducer improve the early-strength strength of concrete better.

Sample 3 uses modified tree ash powder, while sample 1 uses untreated tree ash powder. From the data in Tables 2 and 3, it can be seen that the early strength of sample 3 is higher than that of the sample. The early strength of 1 is good, and the impermeability of sample 3 is also better than that of sample 1. This shows that the modified tree ash powder can significantly improve the compatibility between tree ash powder, polycarboxylate superplasticizer, sepiolite powder and triethanolamine, and it is beneficial to further enhance the dispersion of early strength superplasticizer. and compatibility with concrete, so as to further improve the effect of early strength water reducer on the early strength of concrete as a whole; at the same time, the particle size of tree ash powder is controlled between 0.8-1.2μm, so When the early-strength water-reducing agent is added to concrete, the tree ash powder in the water-reducing agent can be further filled in the gaps of the coarse aggregate in the concrete, which is beneficial to improve the compactness of the concrete, thereby improving the impermeability of the concrete. performance, which in turn contributes to the durability of concrete.

Sample 8 did not add sepiolite powder, sample 1 added sepiolite powder, and sample 4 added pretreated sepiolite powder. It can be seen from the data in Table 2 and Table 3 that the early strength of sample 1 is The strength and impermeability are better than those of sample 8, and the early strength and impermeability of sample 4 are better than those of sample 1, which means that after pretreatment The sepiolite powder is easy to absorb the components such as tree ash powder in the early-strength superplasticizer. The tree ash powder makes the sepiolite easily and uniformly dispersed in the raw material system of the early-strength superplasticizer, which is beneficial to the early-strength superplasticizer. The effect of improving the early strength of concrete is better; at the same time, the sepiolite and vinyltriethoxysilane are evenly mixed, which is conducive to the compatibility between sepiolite and other components in the early strength water reducer, At the same time, it is also beneficial to improve the compatibility of the early-strength water-reducing agent with other components in the concrete, thereby further improving the early-strength and water-reducing effects of the early-strength water-reducing agent on concrete.

The range of parts by mass of tree ash powder and sepiolite powder in Sample 10 is not within the range of mass parts of tree ash powder and sepiolite powder in the present invention. It can be seen from the data in Table 2 and Table 3 that the early strength and impermeability of sample 10 are worse than those of samples 1-6, and the fluidity of sample 10 is higher than that of samples 1-6. It can be seen that the early-strength water-reducing agent prepared by each component according to a specific proportion has better early-strength-enhancing effect and impermeability of concrete, thereby making the early-strength strength and durability of concrete better.

The above embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. Those skilled in the art can make modifications without creative contribution to the present embodiment as required after reading this specification, but only in the claims of the present invention. are protected by patent law.

Claims (9)

1. An early strength water reducing agent is characterized in that: the adhesive comprises the following components in parts by mass:

65-85 parts of deionized water

50-55 parts of polycarboxylic acid water reducing agent

15-20 parts of tree ash powder

10-16 parts of sepiolite powder

3-7 parts of triethanolamine

1-3 parts of a defoaming agent.

2. The early strength water reducer of claim 1, which is characterized in that: the tree ash powder is modified tree ash powder, and the preparation method of the modified tree ash powder comprises the following steps:

(1) soaking tree ash powder in 10-15 vol% sodium hydroxide solution for 2-3 hr;

(2) soaking in 10-15% hydrochloric acid solution for 2-3 hr;

(3) washing with deionized water for several times until the tree ash powder is neutral, and oven drying;

(4) grinding to obtain powder with particle size of 0.8-1.2 μm to obtain modified tree ash powder.

3. The early strength water reducer of claim 1, which is characterized in that: the sepiolite powder needs to be pretreated, and the pretreatment method comprises the following steps:

soaking sepiolite in corresponding mass parts of hydrochloric acid with the volume fraction of 15-20% for 1-2 hours, standing, clarifying, centrifuging, washing to be neutral by using deionized water, drying, adding vinyl triethoxysilane with the mass of 3-5% of the sepiolite, stirring uniformly, drying, and crushing into powder to obtain the sepiolite powder.

4. The early strength water reducer of claim 3, which is characterized in that: the sepiolite powder has the mesh number of 400-800 meshes.

5. The early strength water reducer of claim 1, which is characterized in that: also comprises 5-12 parts by mass of hollow glass microspheres.

6. The early strength water reducer of claim 5, which is characterized in that: the average particle size of the hollow glass beads is 20-25 μm.

7. The early strength water reducer of claim 6, which is characterized in that: the adhesive comprises the following components in parts by mass:

68-85 parts of deionized water

51-55 parts of polycarboxylic acid water reducing agent

16-20 parts of tree ash powder

11-16 parts of sepiolite powder

5-12 parts of hollow glass beads

3.5-7 parts of triethanolamine

1.3-3 parts of a defoaming agent.

8. The early strength water reducer of claim 5, which is characterized in that: the adhesive comprises the following components in parts by mass:

76 portions of deionized water

53 parts of polycarboxylic acid water reducing agent

18 parts of tree ash powder

Sepiolite powder 13 parts

Hollow glass bead 9 parts

4.5 parts of triethanolamine

And 2 parts of a defoaming agent.

9. A method for preparing the early strength water reducer of any one of claims 1 to 8, which is characterized by comprising the following steps: the method comprises the following steps:

s1, mixing deionized water, a polycarboxylic acid water reducer and triethanolamine in corresponding parts by mass, and uniformly stirring for 5-10min at the temperature of 30-35 ℃ to obtain a mixture A;

s2, adding the tree ash powder, the sepiolite powder and the hollow glass beads in corresponding parts by mass into the mixture A while stirring to obtain a mixture B;

and S3, adding a defoaming agent in a corresponding mass part into the mixture B, and stirring for 10-15min to obtain the early strength water reducing agent.