CN111423155A - Early strength water reducing agent and preparation method thereof - Google Patents
Early strength water reducing agent and preparation method thereof Download PDFInfo
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- CN111423155A CN111423155A CN202010241422.3A CN202010241422A CN111423155A CN 111423155 A CN111423155 A CN 111423155A CN 202010241422 A CN202010241422 A CN 202010241422A CN 111423155 A CN111423155 A CN 111423155A
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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
- C04B2103/14—Hardening accelerators
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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
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
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, wherein the early strength water reducing agent 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 and 1-3 parts of defoaming agent; the preparation 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, the sepiolite powder and the hollow glass beads in corresponding parts by mass into the mixture A while stirring to obtain a mixture B; s3, adding a defoaming agent in a corresponding mass part into the mixture B, and stirring to obtain the early strength water reducing agent; the early strength water reducing agent provided by the invention has the advantage of good dispersibility, and can improve the effect of improving the early strength of concrete.
Description
Technical Field
The invention relates to the technical field of concrete admixtures, in particular to an early strength water reducing agent and a preparation method thereof.
Background
The concrete admixture is a substance which is added before or during the mixing of concrete and is used for improving the performance of the concrete. The admixture can effectively improve the performance of concrete and has good economic benefit, so the admixture is widely applied in many countries, and the application in engineering is more and more emphasized, thus becoming an indispensable material in concrete. The early strength water reducing agent is an additive for accelerating the development of early strength of concrete, can promote the hydration and hardening of cement and shorten the curing period of concrete.
The early-strength polycarboxylate superplasticizer is a water reducer commonly used by people, but in the process of preparing concrete, the dispersibility of the early-strength polycarboxylate superplasticizer in a concrete raw material system is poor, so that the early-strength polycarboxylate superplasticizer is easy to cause unobvious improvement of the early strength of the concrete, and therefore, the early-strength polycarboxylate superplasticizer has a lifting space.
Disclosure of Invention
The invention aims to provide the early strength water reducing agent which has the advantage of good dispersibility and is beneficial to improving the early strength of concrete.
In order to realize the first purpose, the invention provides the following technical scheme:
an early strength water reducing agent 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.
By adopting the technical scheme, the deionized water, the polycarboxylic acid tree water reducing agent and the triethanolamine are matched to form the main components of the early strength water reducing agent, and the addition of the tree ash powder is favorable for improving the dispersibility of the early strength water reducing agent, so that the early strength water reducing agent can be better and uniformly dispersed in a concrete raw material system, and the early strength water reducing agent has better effect of improving the early strength of concrete; the addition of the sepiolite powder is beneficial to further improving the early strength of the early strength water reducing agent to concrete; meanwhile, the sepiolite powder and the tree ash powder are matched, so that the sepiolite powder can be more uniformly distributed in a raw material system of the early strength water reducing agent, and the early strength water reducing agent has a better effect of improving the early strength of concrete; the addition of the defoaming agent is favorable for improving the problem of multi-bubble of the early strength water reducing agent, and is favorable for reducing the gas content of the early strength water reducing agent, so that the early strength water reducing agent can improve the compaction degree of concrete.
Further, the tree ash powder is a modified tree ash powder, and the modified tree ash powder is prepared by the following method:
(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.
By adopting the technical scheme, the tree ash powder is soaked in a 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, and the tree ash powder can be modified to obviously improve the compatibility among the tree ash powder, a polycarboxylic acid water reducing agent, sepiolite powder and triethanolamine, and simultaneously facilitate further enhancing the dispersibility of the early strength water reducing agent and the compatibility with concrete, so that the improvement effect of the early strength water reducing agent on the early strength of the concrete can be further improved on the whole; meanwhile, the granularity of the tree ash powder is controlled to be 0.8-1.2 microns, so that when the early strength water reducing agent is added into concrete, the tree ash powder in the water reducing agent can be further filled in gaps of coarse aggregates in the concrete, the compactness of the concrete is favorably improved, the impermeability of the concrete is favorably improved, and the durability of the concrete is favorably improved.
Further, 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.
Further, the sepiolite powder has the mesh number of 400-800 meshes.
By adopting the technical scheme, the sepiolite is soaked by the hydrochloric acid, so that the specific surface area of the sepiolite is favorably improved, the internal channel of the sepiolite is communicated, the sepiolite is easy to adsorb components such as tree ash powder and the like in the early strength water reducing agent, and the tree ash powder enables the sepiolite to be easily and uniformly dispersed in a raw material system of the early strength water reducing agent, so that the early strength water reducing agent is favorably enabled to have a better effect of improving the early strength of concrete; meanwhile, the sepiolite and the vinyltriethoxysilane are uniformly mixed, so that the compatibility between the sepiolite and other components in the early strength water reducing agent is facilitated, and the compatibility between the early strength water reducing agent and other components in concrete is also facilitated to be improved, so that the early strength and water reducing effect of the early strength water reducing agent on the concrete are further improved.
Further, the early strength water reducing agent also comprises 5-12 parts by mass of hollow glass beads.
Further, the average particle size of the hollow glass microspheres is 20-25 μm.
By adopting the technical scheme, the addition of the hollow glass beads is beneficial to improving the fluidity of the early strength water reducing agent, and the hollow glass beads and the tree ash powder are matched to play a synergistic effect, so that the early strength water reducing agent is more easily and uniformly dispersed in a raw material system of concrete.
Further, the early strength water reducing agent 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.
Further, the early strength water reducing agent 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.
By adopting the technical scheme, the early strength water reducing agent prepared from the components according to a specific proportion has better early strength improving effect and impermeability on concrete, so that the early strength and durability of the concrete are better.
The second purpose of the invention is to provide a preparation method of the early strength water reducing agent, and the prepared early strength water reducing agent has a better effect of improving the early strength of cement concrete.
In order to achieve the second purpose, the invention provides the following technical scheme:
a preparation method of an early strength water reducing agent 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.
By adopting the technical scheme, the early strength water reducing agent prepared from the components according to the specific preparation method has good dispersibility, so that the early strength improving effect and the durability improving effect of the early strength water reducing agent on concrete are better.
In conclusion, the invention has the following beneficial effects:
1. deionized water, a polycarboxylic acid tree water reducing agent and triethanolamine are matched to form main components of the early strength water reducing agent, and the addition of the tree ash powder is favorable for improving the dispersibility of the early strength water reducing agent, so that the early strength water reducing agent can be better and uniformly dispersed in a concrete raw material system, and the early strength water reducing agent has a better effect of improving the early strength of concrete; the addition of the sepiolite powder is beneficial to further improving the early strength of the early strength water reducing agent to concrete; meanwhile, the sepiolite powder and the tree ash powder are matched, so that the sepiolite powder can be more uniformly distributed in a raw material system of the early strength water reducing agent, and the early strength water reducing agent has a better effect of improving the early strength of concrete; the addition of the defoaming agent is favorable for improving the problem of multi-bubble of the early strength water reducing agent, and is favorable for reducing the gas content of the early strength water reducing agent, so that the early strength water reducing agent can improve the compaction degree of concrete.
2. The hydrochloric acid is used for soaking the sepiolite, so that the specific surface area of the sepiolite is favorably improved, the internal channel of the sepiolite is communicated, the sepiolite is easy to adsorb components such as tree ash powder and the like in the early strength water reducing agent, and the tree ash powder enables the sepiolite to be easily and uniformly dispersed in a raw material system of the early strength water reducing agent, so that the early strength water reducing agent is favorably enabled to have a better effect of improving the early strength of concrete; meanwhile, the sepiolite and the vinyltriethoxysilane are uniformly mixed, so that the compatibility between the sepiolite and other components in the early strength water reducing agent is facilitated, and the compatibility between the early strength water reducing agent and other components in concrete is also facilitated to be improved, so that the early strength and water reducing effect of the early strength water reducing agent on the concrete are further improved.
Detailed Description
The present invention will be described in further detail with reference to examples.
In the following examples, as the polycarboxylic acid water reducing agent, an APEG type water reducing agent of APEG600, which is a type of allyl polyether (APEG series) sold by Liaoning Colon Fine chemical Co., Ltd, was used, and the appearance thereof was pale yellow liquid.
In the following examples, the defoaming agent was polydimethylsiloxane.
In the following examples, the early strength water reducing agent may further comprise other conventional additives, such as air entraining agent, etc., and the addition of other additives does not substantially affect the implementation of the present invention.
All the raw materials adopted by the invention are commercially available. The equipment used in the preparation method of the early strength water reducing agent is the equipment conventionally used in the field.
Table 1 components and parts by mass of the early strength water reducing agent.
Example 1
The early strength water reducing agent comprises the components in parts by mass shown in Table 1. In this example, the sepiolite powder had a mesh size of 200 mesh. The particle size of the tree ash powder was 2.0. mu.m.
A preparation method of an early strength water reducing agent comprises the following steps:
s1, mixing deionized water, a polycarboxylic acid water reducing agent and triethanolamine in corresponding parts by mass, and uniformly stirring for 5min at the temperature of 30 ℃ to obtain a mixture A.
And S2, adding the tree ash powder and the sepiolite powder 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 10min to obtain the early strength water reducing agent.
Example 2
The early strength water reducing agent comprises the components in parts by mass shown in Table 1.
In this example, the average particle size of the hollow glass microspheres was 20 μm.
In this example, the sepiolite powder has a mesh size of 325 mesh.
A preparation method of an early strength water reducing agent comprises the following steps:
s1, mixing deionized water, a polycarboxylic acid water reducing agent and triethanolamine in corresponding parts by mass, and uniformly stirring for 8min at 33 ℃ to obtain a mixture A.
And 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 12min to obtain the early strength water reducing agent.
Example 3
An early strength water reducing agent, which is different from the water reducing agent in the embodiment 2: the components and parts by mass are shown in table 1.
In this example, the average particle size of the hollow glass microspheres was 21 μm.
In this example, the tree ash powder was a modified tree ash powder, and the modified tree ash powder was prepared as follows:
(1) the tree ash powder was soaked for 2 hours in 10% by volume sodium hydroxide solution.
(2) Soaking in 10% hydrochloric acid solution for 2 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 μm to obtain modified tree ash powder.
A preparation method of an early strength water reducing agent comprises the following steps:
s1, mixing deionized water, a polycarboxylic acid water reducing agent and triethanolamine in corresponding parts by mass, and uniformly stirring for 10min at 35 ℃ to obtain a mixture A.
And 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 15min to obtain the early strength water reducing agent.
Example 4
An early strength water reducing agent, which is different from the water reducing agent in example 3: the components and parts by mass are shown in table 1.
In this example, the average particle size of the hollow glass microspheres was 22 μm.
In this example, the tree ash powder was a modified tree ash powder, and the modified tree ash powder was prepared as follows:
(1) the tree ash powder was soaked for 2.5 hours with a 13% by volume sodium hydroxide solution.
(2) Soak in 13% hydrochloric acid solution for 2.5 hours.
(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 1.0 μm to obtain modified tree ash powder.
In this example, sepiolite powder needs to be pretreated by the following method:
soaking corresponding parts of sepiolite in 15% hydrochloric acid by volume for 1 hour, standing, clarifying, centrifuging, washing with deionized water to neutrality, drying, adding vinyltriethoxysilane 3% by mass of sepiolite, stirring, drying, and pulverizing into powder.
In this example, the sepiolite powder had a mesh size of 400 mesh.
Example 5
An early strength water reducing agent, which is different from the water reducing agent in example 4: the components and parts by mass are shown in table 1.
In this example, the average particle size of the hollow glass microspheres was 24 μm.
In this example, the tree ash powder was a modified tree ash powder, and the modified tree ash powder was prepared as follows:
(1) the tree ash powder was soaked for 3 hours in 15% by volume sodium hydroxide solution.
(2) Soaking in 15% hydrochloric acid solution for 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 1.2 μm to obtain modified tree ash powder.
In this example, sepiolite powder needs to be pretreated by the following method:
soaking corresponding parts of sepiolite in 18% hydrochloric acid by volume for 1.5 hours, standing, clarifying, centrifuging, washing with deionized water to neutrality, drying, adding vinyltriethoxysilane 4% by mass of sepiolite, stirring uniformly, drying, and pulverizing into powder.
In this example, the sepiolite powder had a mesh size of 500 mesh.
Example 6
An early strength water reducing agent, which is different from the water reducing agent in example 5 in that: the components and parts by mass are shown in table 1.
In this example, the average particle size of the hollow glass microspheres was 25 μm.
In this example, the sepiolite powder was pretreated as follows:
soaking sepiolite in corresponding mass parts by using hydrochloric acid with the volume fraction of 20% for 2 hours, standing, clarifying, centrifuging, washing to be neutral by using deionized water, drying, adding vinyl triethoxysilane with the mass equivalent to 5% of the sepiolite, uniformly stirring, drying, and crushing into powder to obtain the sepiolite powder.
In this example, the sepiolite powder has a mesh size of 800 mesh.
Comparative example 1
An early strength water reducing agent, which is different from the water reducing agent in example 3: no tree ash powder was added.
Comparative example 2
An early strength water reducing agent, which is different from the water reducing agent in the embodiment 1: sepiolite powder was not added.
Comparative example 3
An early strength water reducing agent, which is different from the water reducing agent in example 5 in that: the average particle size of the hollow glass microspheres was 30 μm.
Comparative example 4
An early strength water reducing agent, which is different from the water reducing agent in example 5 in that: the early strength water reducing agent comprises the following components in parts by mass:
76 portions of deionized water
53 parts of polycarboxylic acid water reducing agent
12 parts of tree ash powder
Sepiolite powder 5 parts
Hollow glass bead 12 parts
4.5 parts of triethanolamine
And 2 parts of a defoaming agent.
And (3) performance detection:
performance detection 1, cement paste fluidity detection: the early strength water reducing agents prepared in examples 1 to 6 and comparative examples 1 to 4 were respectively blended into neat cement pastes, and the corresponding neat cement pastes were set as samples 1 to 10, with the blending amount of the early strength water reducing agent being 1%, wherein the neat cement paste includes 1000g of cement, 2000g of standard sand, 305g of water, and 42.5R of cement, the neat paste fluidity test was performed according to GB/T8077-2000 "homogeneity test method for concrete admixture", the initial fluidity of the samples 1 to 10, the neat paste fluidity after standing for 60min, and after 120min were respectively detected, and the detection results are recorded in table 2.
Table 2 samples 1-10 were tested for performance test 1.
Performance test 2. detection of concrete mechanical properties and durability: the early strength water reducing agents prepared in examples 1 to 6 and comparative examples 1 to 4 were respectively blended into concrete, and the corresponding concrete was set as sample 1 to 10, the blending amount of the early strength water reducing agent was 1%, the cement in the concrete, fly ash, mineral powder, sand, gravel, water, 190:80:80:1000:840:160, the cement was 42.5R cement, the fly ash was second-grade fly ash, the silt content of the medium sand was 2.2%, the fineness modulus was 2.6, the silt content of the gravel was 0.5%, the particle size was 5 to 25mm, the stirring time was 90 seconds, the vibrating time was 15 seconds, the concrete was maintained at (20 ± 3) ° c for 12 hours, a standard block was prepared after removal of the mold, various properties of the concrete were measured according to the following standards, and the measurement results were recorded in table 3.
1. Compressive strength: GB/T50081-2002 Standard for testing mechanical properties of common concrete.
2. Water reducing rate: GB/T8076-2008 'concrete admixture' for detection.
3. Impermeability: the anti-permeability grade of the sample 1-10 is detected by a step-by-step pressurization method in GB/T50082-2009 Standard test method for the long-term performance and durability of common concrete.
4. Corrosion to steel bars: GB/T50082-2009 Standard test method for long-term performance and durability of common concrete is used for detection.
Table 3 samples 1-10 were tested for performance test 2.
The hollow glass beads are added to the sample 2, the hollow glass beads are not added to the sample 1, and the data in the tables 2 and 3 show that the early strength and the impermeability of the sample 2 are better than those of the sample 1, which shows that the addition of the hollow glass beads is favorable for improving the fluidity of the early strength water reducing agent, the hollow glass beads and the tree ash powder are matched to play a synergistic effect, and the early strength water reducing agent is favorable for being uniformly dispersed in a raw material system of concrete more easily, so that the fluidity of the concrete is better.
The average particle size of the hollow glass beads of the sample 9 is controlled to be 30 microns, the average particle size of the hollow glass beads of the samples 2-6 is 20 microns, and when the early strength water reducing agent is added into concrete, the hollow glass beads in the early strength water reducing agent are beneficial to filling pores in coarse aggregates in the concrete, so that the anti-permeability performance of the concrete is improved.
Sample 7 is not adding tree ashes powder, sample 1 compares with sample 7, the early strength and the water-reducing rate of sample 3 are inferior to the early strength and the water-reducing rate of sample 7, this demonstrates, the interpolation of tree ashes powder, be favorable to improving the dispersibility of early strength water-reducing agent, be favorable to making early strength water-reducing agent can be homodisperse in the concrete raw materials system better, thereby make early strength water-reducing agent better to the water-reducing effect of concrete, be favorable to making the promotion effect of early strength water-reducing agent to the early strength of concrete better simultaneously.
As can be seen from the data in tables 2 and 3, the early strength of sample 3 is better than that of sample 1, and the impermeability of sample 3 is better than that of sample 1. The compatibility among the tree ash powder, the polycarboxylic acid water reducing agent, the sepiolite powder and the triethanolamine can be obviously improved after the tree ash powder is subjected to modification treatment, and the dispersibility of the early strength water reducing agent and the compatibility with concrete can be further enhanced, so that the improvement effect of the early strength water reducing agent on the early strength of the concrete can be further integrally improved; meanwhile, the granularity of the tree ash powder is controlled to be 0.8-1.2 microns, so that when the early strength water reducing agent is added into concrete, the tree ash powder in the water reducing agent can be further filled in gaps of coarse aggregates in the concrete, the compactness of the concrete is favorably improved, the impermeability of the concrete is favorably improved, and the durability of the concrete is favorably improved.
The sepiolite powder is not added to the sample 8, the sepiolite powder is added to the sample 1, the pretreated sepiolite powder is added to the sample 4, and the data in tables 2 and 3 show that the early strength and the impermeability of the sample 1 are better than those of the sample 8, and the early strength and the impermeability of the sample 4 are better than those of the sample 1, which indicates that the pretreated sepiolite powder can easily adsorb components such as tree ash powder in the early strength water reducing agent, and the tree ash powder can easily and uniformly disperse the sepiolite in a raw material system of the early strength water reducing agent, so that the early strength water reducing agent can better improve the early strength of concrete; meanwhile, the sepiolite and the vinyltriethoxysilane are uniformly mixed, so that the compatibility between the sepiolite and other components in the early strength water reducing agent is facilitated, and the compatibility between the early strength water reducing agent and other components in concrete is also facilitated to be improved, so that the early strength and water reducing effect of the early strength water reducing agent on the concrete are further improved.
The mass parts ranges of the tree ash powder and the sepiolite powder in the sample 10 are not within the mass parts ranges of the tree ash powder and the sepiolite powder in the present invention. As can be seen from the data in tables 2 and 3, the early strength and the impermeability of the sample 10 are inferior to those of the samples 1 to 6, and the fluidity of the sample 10 is lower than that of the samples 1 to 6, so that the early strength improving effect and the impermeability of the concrete are better due to the early strength water reducing agent prepared by the components according to the specific proportion, and the early strength and the durability of the concrete are better.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but only protected by the patent laws within the scope of the claims.
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.
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Cited By (2)
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| CN114455880A (en) * | 2022-02-24 | 2022-05-10 | 漯河市昊源新材料有限公司 | Shrinkage-reducing anti-freezing polycarboxylic water reducer and preparation method thereof |
| CN116789456A (en) * | 2023-07-10 | 2023-09-22 | 佛山市奥林万达新型建材有限公司 | Ceramic dispergator and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114455880A (en) * | 2022-02-24 | 2022-05-10 | 漯河市昊源新材料有限公司 | Shrinkage-reducing anti-freezing polycarboxylic water reducer and preparation method thereof |
| CN116789456A (en) * | 2023-07-10 | 2023-09-22 | 佛山市奥林万达新型建材有限公司 | Ceramic dispergator and preparation method thereof |
| CN116789456B (en) * | 2023-07-10 | 2024-04-19 | 佛山市奥林万达新型建材有限公司 | Ceramic dispergator and preparation method thereof |
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