CN111548048A - Shrinkage-reducing concrete high-efficiency water reducing agent - Google Patents
Shrinkage-reducing concrete high-efficiency water reducing agent Download PDFInfo
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- CN111548048A CN111548048A CN202010494700.6A CN202010494700A CN111548048A CN 111548048 A CN111548048 A CN 111548048A CN 202010494700 A CN202010494700 A CN 202010494700A CN 111548048 A CN111548048 A CN 111548048A
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- shrinkage
- naphthalene
- reducing agent
- superplasticizer
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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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a shrinkage-reducing concrete high-efficiency water reducing agent which can effectively reduce the shrinkage rate of concrete. The naphthalene based superplasticizer has the good characteristics of simple process, convenient production and reliable performance, can effectively reduce the shrinkage of concrete, well overcomes the defect of large shrinkage of the naphthalene based superplasticizer, expands the application range of the naphthalene based superplasticizer, and has great social and economic benefits.
Description
Technical Field
The invention belongs to the field of concrete admixtures, and particularly relates to a shrinkage-reducing type concrete high-efficiency water reducing agent.
Background
The naphthalene-based high-efficiency water reducing agent has the advantages of high water reducing rate, good cement adaptability, low gas content, low price and small influence on setting time, becomes the water reducing agent with the maximum production and use amount in China, accounts for more than 55% of the use amount of the water reducing agent in China, can be used in combination with other additives, and becomes the water reducing agent with the widest application range in China. The naphthalene-based high-efficiency water reducing agent is usually used for high-performance concrete and high-strength concrete, free water in the concrete is rapidly consumed by violent hydration reaction at early stage due to the characteristics of large amount of cementing materials and low water-cement ratio of the high-performance concrete and the high-strength concrete, so that the macroscopic volume shrinkage and internal stress increase of the concrete are caused by self-drying, and the use of the naphthalene-based high-efficiency water reducing agent reduces the originally low water-cement ratio again, so that the possibility of shrinkage cracking of the concrete is increased.
Generally, the solution of the problem is to mix an expanding agent into concrete to generate an expansive hydration product to compensate the concrete shrinkage and reduce cracking, but the effect is not obvious when the mixing amount of the expanding agent is too small, and the mixing amount is too large, so that the excessive expanding agent can expand by itself to easily cause the concrete cracking, and the use of the expanding agent has obvious limitation and uncertainty. The expansion agent has the action principle that the expansion agent reacts with enough water to generate an expansive hydration product, and obviously, for high-performance concrete and high-strength concrete which belong to the concrete with low water-cement ratio, the expansion agent does not have the condition, so that the expansion agent usually cannot play the corresponding function, and even the external water is difficult to enter because the structure inside the concrete is compact, thereby aggravating the cracking risk of the concrete.
Research is carried out in the United states and Japan in the eighties of the last century, and a novel additive called a concrete shrinkage reducing agent is developed, which reduces the shrinkage stress of concrete capillary pores during water loss, reduces the surface tension of pore water in the capillary pores, increases the viscosity of the pore water, and enhances the adsorption of the water in gel, thereby reducing the shrinkage of the concrete and achieving the purpose of reducing the cracking of the concrete. The concrete shrinkage reducing agent has the advantages that the naphthalene high-efficiency water reducing agent is required to overcome, so that the performance defect of large shrinkage of the naphthalene high-efficiency water reducing agent can be overcome from the compounding process, and the requirement of the market on the product performance can be met.
Disclosure of Invention
Aiming at the performance defect of large shrinkage of the conventional naphthalene-based high-efficiency water reducing agent, the invention aims to provide a compounding method of the shrinkage-reducing naphthalene-based high-efficiency water reducing agent, and the prepared shrinkage-reducing naphthalene-based high-efficiency water reducing agent has obvious shrinkage reducing performance in the aspect of performance by a compounding mode.
Specifically, in the first aspect, the shrinkage-reducing naphthalene-based superplasticizer provided by the invention is prepared by compounding, by weight, 85.0-95.0% of a water reducing component, 3.0-15.0% of a shrinkage-reducing component and 0.1-4.0% of a thickening component; the shrinkage reducing component can effectively reduce the shrinkage rate of concrete, and the thickening component can assist the shrinkage reducing component in reducing the shrinkage rate.
In some embodiments, the water reducing component is a naphthalene based superplasticizer;
in some embodiments, the shrinkage reduction component consists of one or more of polyethylene glycol, neopentyl glycol, diethylene glycol monobutyl ether, and t-butanol;
in some embodiments, the thickening component is comprised of one or more of polyacrylamide, xanthan gum, carboxymethyl cellulose.
In some embodiments, the water reducer has a reduction of no more than 50%.
In some embodiments, the water reducing component is a naphthalene based superplasticizer; the shrinkage reducing component is composed of one or more of polyethylene glycol, neopentyl glycol, diethylene glycol monobutyl ether and tertiary butanol; the thickening component is composed of one or more of polyacrylamide, xanthan gum and carboxymethyl cellulose.
In some embodiments, the shrinkage reducing component
In some specific embodiments, the water reducing agent is compounded by 90.7% of naphthalene-based high-efficiency water reducing agent, 5.7% of tertiary butanol and 3.6% of carboxymethyl cellulose.
In some specific embodiments, the water reducing agent is compounded by 88.1% of naphthalene-based high-efficiency water reducing agent, 9.7% of polyethylene glycol and 2.2% of carboxymethyl cellulose.
In a second aspect, the invention provides a reduction-type naphthalene-based superplasticizer, and a preparation method of the reduction-type naphthalene-based superplasticizer, the method comprises the following steps: after weighing the components in percentage by weight, firstly adding the naphthalene-based superplasticizer into a reaction kettle, heating to 50-60 ℃, then sequentially adding the shrinkage-reducing components every 10-15 minutes, stirring until the shrinkage-reducing components are completely dissolved, maintaining the temperature of the reaction kettle at 50-60 ℃, continuously stirring for 30 minutes, cooling to 30-40 ℃, adding the thickening components, and continuously stirring for 30 minutes until the temperature is cooled to room temperature, thus completing the product.
Compared with the prior art, the invention has the beneficial effects that:
1. the shrinkage-reducing naphthalene-based high-efficiency water reducing agent has high water reducing rate.
2. The shrinkage-reducing naphthalene-based superplasticizer can effectively maintain the strength of concrete.
3. The shrinkage-reducing naphthalene-based superplasticizer has good anti-cracking performance, has effects on plastic shrinkage, self-shrinkage and drying shrinkage, can remarkably reduce the shrinkage rate of concrete, and the shrinkage rate can reach
4. The shrinkage-reducing naphthalene-based high-efficiency water reducing agent inherits the advantages of the naphthalene-based high-efficiency water reducing agent and has good adaptability to different grades of portland cement, common portland cement, composite portland cement and the like and cement of manufacturers. Besides being not suitable for being compounded with a polycarboxylic acid high-performance water reducing agent, the water reducing agent is not influenced when being compounded with other water reducing agents such as melamine, aliphatic series, sulfamate and the like, and can also be compounded with products such as an expanding agent, a rust inhibitor, a retarder, an early strength agent, an air entraining agent and the like.
5. Compared with a single naphthalene-based high-efficiency water reducing agent, the shrinkage-reducing naphthalene-based high-efficiency water reducing agent disclosed by the invention has good shrinkage resistance, and has higher water reducing rate and good adaptability compared with a single concrete shrinkage-reducing agent. The naphthalene based superplasticizer has the good characteristics of simple process, convenient production and reliable performance, well overcomes the performance defect of large shrinkage of the naphthalene based superplasticizer, expands the application range of the naphthalene based superplasticizer, and has great social and economic benefits.
Detailed Description
The following examples used the starting materials:
39.0 percent of liquid naphthalene high-efficiency water reducing agent.
Liquid polyethylene glycol with molecular weight of 200, liquid neopentyl glycol with content of 90.0%, liquid diethylene glycol monobutyl ether with content of 99.0%, and liquid tert-butyl alcohol with content of 85.0%;
powder polyacrylamide with the molecular weight of 1200 ten thousand, industrial-grade powder xanthan gum with the content of 98.0 percent, and powder carboxymethyl cellulose with the content of 96.0 percent.
Example 1
The embodiment is compounded by the following components in percentage by weight: 87.3% of naphthalene-based superplasticizer, 8.2% of polyethylene glycol, 2.5% of neopentyl glycol and 2.0% of xanthan gum.
After weighing the components in parts by weight, firstly adding 87.3% of a naphthalene-based superplasticizer into a reaction kettle, heating to 50-60 ℃, then sequentially adding 8.2% of shrinkage-reducing components polyethylene glycol and 2.5% of neopentyl glycol every 10-15 minutes, stirring until the components are completely dissolved, maintaining the temperature of the reaction kettle to be 50-60 ℃, continuously stirring for 30 minutes, cooling to 30-40 ℃, adding 2.0% of a thickening component xanthan gum, and continuously stirring for 30 minutes until the mixture is cooled to room temperature, thus completing the product.
Example 2
The method is basically the same as that of the embodiment 1, except that the raw materials are different, and the embodiment is compounded by the following components in percentage by weight: 88.1 percent of naphthalene-based superplasticizer, 9.7 percent of polyethylene glycol and 2.2 percent of carboxymethyl cellulose.
Example 3
The method is basically the same as that of the embodiment 1, except that the raw materials are different, and the embodiment is compounded by the following components in percentage by weight: 95.0 percent of naphthalene-based superplasticizer, 3.5 percent of neopentyl glycol and 1.5 percent of xanthan gum.
Example 4
The method is basically the same as that of the embodiment 1, except that the raw materials are different, and the embodiment is compounded by the following components in percentage by weight: 85.4 percent of naphthalene-based superplasticizer, 9.1 percent of polyethylene glycol, 5.3 percent of diethylene glycol monobutyl ether and 0.2 percent of polyacrylamide.
Example 5
The method is basically the same as that of the embodiment 1, except that the raw materials are different, and the embodiment is compounded by the following components in percentage by weight: 90.7 percent of naphthalene-based superplasticizer, 5.7 percent of tertiary butanol and 3.6 percent of carboxymethyl cellulose.
Example 6
The method is basically the same as that of the embodiment 1, except that the raw materials are different, and the embodiment is compounded by the following components in percentage by weight: 85.6 percent of naphthalene-based superplasticizer, 6.8 percent of neopentyl glycol, 4.2 percent of tertiary butanol, 0.3 percent of polyacrylamide and 3.1 percent of carboxymethyl cellulose.
Comparative example 1
Naphthalene series high efficiency water reducing agent 100%.
Test examples
In order to verify the effect of the invention: the concrete mixing proportion is shown in Table 1C40, the shrinkage factor and strength of the concrete are shown in Table 2, calculated according to the total weight ratio of the gelled material.
TABLE 1
TABLE 2
The data show that: the shrinkage-reducing naphthalene-based superplasticizer has higher water reducing rate, not only can maintain the strength of concrete, but also can obviously reduce the shrinkage of the concrete, so that the shrinkage reducing rate can reach
The durability of the concrete is improved.
Claims (10)
1. The shrinkage-reducing concrete high-efficiency water reducing agent is characterized by being prepared by compounding 85.0-95.0% of a water reducing component, 3.0-15.0% of a shrinkage reducing component and 0.1-4.0% of a thickening component in percentage by weight.
2. The reduction-type concrete superplasticizer of claim 1, wherein said water-reducing component is a naphthalene-based superplasticizer.
3. The water reducer according to claim 1, wherein the reducing component is composed of one or more of polyethylene glycol, neopentyl glycol, diethylene glycol monobutyl ether and tertiary butanol.
4. The water reducer according to claim 1, wherein the thickening component is composed of one or more of polyacrylamide, xanthan gum and carboxymethyl cellulose.
5. The reduction-type concrete superplasticizer of claim 1, wherein the reduction rate of said superplasticizer is not more than 50%.
6. The reduction-type concrete superplasticizer of claim 1, wherein said water-reducing component is a naphthalene-based superplasticizer; the shrinkage reducing component is composed of one or more of polyethylene glycol, neopentyl glycol, diethylene glycol monobutyl ether and tertiary butanol; the thickening component is composed of one or more of polyacrylamide, xanthan gum and carboxymethyl cellulose.
7. A reduced concrete superplasticizer according to claim 1, wherein the reduction component is 3.0-15.0%.
8. The reduction-type concrete high-efficiency water reducing agent according to claim 7, characterized in that the water reducing agent is prepared by compounding 90.7% of naphthalene-based high-efficiency water reducing agent, 5.7% of tertiary butanol and 3.6% of carboxymethyl cellulose.
9. The reduction-type concrete high-efficiency water reducing agent according to claim 7, characterized in that the water reducing agent is compounded by 88.1 percent of naphthalene-based high-efficiency water reducing agent, 9.7 percent of polyethylene glycol and 2.2 percent of carboxymethyl cellulose.
10. The preparation method of the reduction-type concrete superplasticizer according to any one of claims 1 to 9, characterized by comprising the following steps: after weighing the components in percentage by weight, firstly adding the naphthalene-based superplasticizer into a reaction kettle, heating to 50-60 ℃, then sequentially adding the shrinkage-reducing components every 10-15 minutes, stirring until the shrinkage-reducing components are completely dissolved, maintaining the temperature of the reaction kettle at 50-60 ℃, continuously stirring for 30 minutes, cooling to 30-40 ℃, adding the thickening components, and continuously stirring for 30 minutes until the temperature is cooled to room temperature, thus completing the product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010494700.6A CN111548048A (en) | 2020-06-03 | 2020-06-03 | Shrinkage-reducing concrete high-efficiency water reducing agent |
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| CN202010494700.6A CN111548048A (en) | 2020-06-03 | 2020-06-03 | Shrinkage-reducing concrete high-efficiency water reducing agent |
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| CN111548048A true CN111548048A (en) | 2020-08-18 |
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| CN202010494700.6A Pending CN111548048A (en) | 2020-06-03 | 2020-06-03 | Shrinkage-reducing concrete high-efficiency water reducing agent |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112430024A (en) * | 2020-11-20 | 2021-03-02 | 杭州三中新型建材科技有限公司 | Prestressed concrete and preparation process thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5880182A (en) * | 1993-10-29 | 1999-03-09 | Mbt Holding Ag | Water-reducing admixtures for cementitious compositions |
| CN1887775A (en) * | 2006-07-13 | 2007-01-03 | 内蒙古科技大学 | Efficient retarding and water reducing agent for concrete |
| CN105384378A (en) * | 2015-12-07 | 2016-03-09 | 安徽省阜南绿原化工有限公司 | Early-strength durable concrete water reducer and preparation method thereof |
| CN105712653A (en) * | 2014-08-18 | 2016-06-29 | 天津旺久科技发展有限公司 | Slow setting water reducing agent |
| CN110550883A (en) * | 2019-09-25 | 2019-12-10 | 绍兴市华冠新型建材有限公司 | Anti-segregation agent for concrete doped with naphthalene water reducer and pumping agent thereof, and preparation method and application thereof |
-
2020
- 2020-06-03 CN CN202010494700.6A patent/CN111548048A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5880182A (en) * | 1993-10-29 | 1999-03-09 | Mbt Holding Ag | Water-reducing admixtures for cementitious compositions |
| CN1887775A (en) * | 2006-07-13 | 2007-01-03 | 内蒙古科技大学 | Efficient retarding and water reducing agent for concrete |
| CN105712653A (en) * | 2014-08-18 | 2016-06-29 | 天津旺久科技发展有限公司 | Slow setting water reducing agent |
| CN105384378A (en) * | 2015-12-07 | 2016-03-09 | 安徽省阜南绿原化工有限公司 | Early-strength durable concrete water reducer and preparation method thereof |
| CN110550883A (en) * | 2019-09-25 | 2019-12-10 | 绍兴市华冠新型建材有限公司 | Anti-segregation agent for concrete doped with naphthalene water reducer and pumping agent thereof, and preparation method and application thereof |
Non-Patent Citations (1)
| Title |
|---|
| 王迎军主编: "《新型材料科学与技术 无机材料卷 中》", 31 October 2016, 华南理工大学出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112430024A (en) * | 2020-11-20 | 2021-03-02 | 杭州三中新型建材科技有限公司 | Prestressed concrete and preparation process thereof |
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Application publication date: 20200818 |