CN111393064A - Ultra-slow-release polycarboxylic acid pumping agent and preparation method thereof - Google Patents
Ultra-slow-release polycarboxylic acid pumping agent and preparation method thereof Download PDFInfo
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- CN111393064A CN111393064A CN202010226607.7A CN202010226607A CN111393064A CN 111393064 A CN111393064 A CN 111393064A CN 202010226607 A CN202010226607 A CN 202010226607A CN 111393064 A CN111393064 A CN 111393064A
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- polycarboxylic acid
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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
Abstract
The invention discloses a super slow-release type polycarboxylic acid pumping agent which comprises the following components in percentage by weight: 60-80% of high-efficiency water reducing agent; 0.5% -1% of fullerene suspension subjected to surface modification; 6% -8% of aliphatic compounds; 1% -5% of sodium gluconate; 1% -5% of carboxylic acid graft copolymer; 0.1-0.5% of cellulose and the balance of water, firstly adding water into a stirrer, and then adding the fullerene suspension subjected to surface modification; a high-efficiency water reducing agent; an aliphatic compound; sodium gluconate; carboxylic acid-based graft copolymers; and sequentially adding the cellulose into the mixer, and stirring for 7-10 hours. The ultra-slow release type polycarboxylic acid pumping agent can improve the impermeability, frost resistance and durability of concrete, can reduce the slump loss of the concrete, is suitable for long-distance transportation and pumping construction, has wide application range, is convenient to purchase raw materials, has lower cost and has obvious economic value.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a super slow-release type polycarboxylic acid pumping agent and a preparation method thereof.
Background
Concrete is an important building material in the construction industry. The pumping agent is an additive capable of improving the pumping performance of concrete mixture. The pumping performance means that the concrete mixture has the properties of smooth passing through a conveying pipeline, no blockage, no segregation and good viscoplasticity. The traditional pumping agent has low cohesive force and is not suitable for large-scale industrial use. With the development of civil engineering construction technology, the requirement on concrete is higher and higher, and the application of C60 and C80-C100 high-strength concrete is more and more extensive, so that a super slow-release type polycarboxylic acid pumping agent needs to be researched to solve the defects in the prior art.
Disclosure of Invention
The pumping agent can improve the impermeability, frost resistance and durability of concrete, can reduce the slump loss of the concrete, is convenient to purchase and use, has lower cost, can obviously reduce the cost when meeting the same requirement on the fluidity of the concrete, has obvious economic benefit, and can effectively solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a super slow release type polycarboxylic acid pumping agent comprises the following components in percentage by weight: 60-80% of high-efficiency water reducing agent; 0.5% -1% of fullerene suspension subjected to surface modification; 6% -8% of aliphatic compounds; 1% -5% of sodium gluconate; 1% -5% of carboxylic acid graft copolymer; 0.1 to 0.5 percent of cellulose and the balance of water.
Preferably, the ultra-slow release type polycarboxylic acid pumping agent consists of the following components in percentage by weight: 75% of high-efficiency water reducing agent; 0.8% of fullerene suspension subjected to surface modification; 6.5% of aliphatic compounds; 4% of sodium gluconate; carboxylic acid graft copolymer 3%; 0.4% of cellulose and the balance of water.
Preferably, the high-efficiency water reducing agent is a naphthalene high-efficiency water reducing agent.
Preferably, the cellulose is formaldehyde cellulose and has a viscosity of 10 ten thousand mPa · s.
A preparation method of a super slow-release type polycarboxylic acid pumping agent is characterized by comprising the following steps:
(1) weighing various raw materials in proportion;
(2) firstly, adding water into a stirrer, and then adding the fullerene suspension subjected to surface modification; a high-efficiency water reducing agent; an aliphatic compound; sodium gluconate; carboxylic acid-based graft copolymers; and sequentially adding the cellulose into a mixer to stir for 7-10 hours to obtain the ultra-slow release type polycarboxylic acid pumping agent.
Preferably, the preparation method of the fullerene suspension subjected to surface modification comprises the following steps: dissolving a surfactant in ethanol, adding a hydrophilic fullerene derivative, and sequentially carrying out mechanical stirring, ball milling and ultrasonic reaction treatment to obtain the fullerene suspension subjected to surface modification.
The fullerene body of the hydrophilic fullerene derivative is a carbon cage containing 50 to 120 carbon atoms, the hydrophilic fullerene derivative contains 1 to 6 flexible ether oxygen chains, and the addition site of a methylene on the fullerene is one of [5, 6] and [6, 6 ]; the structural formula is:
wherein R1 and R2 are one of phenyl, carbonyl, alkyl, aryl and substituted aryl and any combination thereof;
where n takes any number between 1 and 3.
Compared with the prior art, the invention has the beneficial effects that: the ultra-slow release type polycarboxylic acid pumping agent can improve the impermeability, frost resistance and durability of concrete, can reduce the slump loss of the concrete, has good water reducing property, no fluorine and low alkali, has no corrosion effect on reinforcing steel bars, does not have alkali aggregate reaction, is suitable for long-distance transportation and pumping construction, has wide application range, is convenient to purchase raw materials, has lower cost and has obvious economic value. Particularly, the fullerene suspension subjected to surface modification is added into the pumping aid, so that the impermeability, frost resistance and durability of the pumping aid can be obviously improved, the water-reducing and slump-retaining effects on concrete can be achieved, the initial viscosity of the concrete can be effectively reduced, and the water seepage phenomenon during concrete pumping can be avoided.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A super slow release type polycarboxylic acid pumping agent comprises the following components in percentage by weight: 65% of high-efficiency water reducing agent; 1% of fullerene suspension subjected to surface modification; 6% of nonylphenol polyoxyethylene ether; 2% of sodium gluconate; 1% of carboxylic acid graft copolymer; 0.2% of cellulose and the balance of water.
The method for preparing the ultra-slow release type polycarboxylic acid pumping agent comprises the following steps:
(1) weighing various raw materials in proportion;
(2) firstly, adding water into a stirrer, and then adding the fullerene suspension subjected to surface modification; a high-efficiency water reducing agent; an aliphatic compound; sodium gluconate; carboxylic acid-based graft copolymers; and sequentially adding the cellulose into a mixer, stirring and dissolving for 7 hours to obtain the ultra-slow release type polycarboxylic acid pumping agent.
The preparation method of the fullerene suspension subjected to surface modification comprises the following steps: adding 1000 parts by mass of ethanol, 15 parts by mass of polyethylene glycol, 25 parts by mass of sodium dodecyl sulfate and 8 parts by mass of hydrophilic fullerene derivative, and sequentially carrying out mechanical stirring, ball milling and ultrasonic reaction treatment to obtain the fullerene suspension subjected to surface modification.
The above articles were subjected to key performance tests, with the results shown in table 1 below:
table 1: key Performance test results for example 1
Example 2
A super slow release type polycarboxylic acid pumping agent comprises the following components in percentage by weight: 70% of high-efficiency water reducing agent; 0.8% of fullerene suspension subjected to surface modification; 6.5 percent of nonylphenol polyoxyethylene ether; 3% of sodium gluconate; carboxylic acid graft copolymer 3%; 0.3% of cellulose and the balance of water.
The method for preparing the ultra-slow release type polycarboxylic acid pumping agent comprises the following steps:
(1) weighing various raw materials in proportion;
(2) firstly, adding water into a stirrer, and then adding the fullerene suspension subjected to surface modification; a high-efficiency water reducing agent; an aliphatic compound; sodium gluconate; carboxylic acid-based graft copolymers; and sequentially adding the cellulose into a mixer, stirring and dissolving for 8 hours to obtain the ultra-slow release type polycarboxylic acid pumping agent.
The preparation method of the fullerene suspension subjected to surface modification comprises the following steps: adding 1000 parts by mass of ethanol, 8 parts by mass of polyethylene glycol, 15 parts by mass of sodium dodecyl sulfate and 6 parts by mass of hydrophilic fullerene derivative, and sequentially carrying out mechanical stirring, ball milling and ultrasonic reaction treatment to obtain the fullerene suspension subjected to surface modification.
The above articles were subjected to key performance tests, the results of which are shown in table 2 below:
table 2: key Performance test results for example 2
Example 3
A super slow release type polycarboxylic acid pumping agent comprises the following components in percentage by weight: 75% of high-efficiency water reducing agent; 1.0% of fullerene suspension subjected to surface modification; 7.5 percent of nonylphenol polyoxyethylene ether; 4% of sodium gluconate; carboxylic acid graft copolymer 4%; 0.5% of cellulose and the balance of water.
The method for preparing the ultra-slow release type polycarboxylic acid pumping agent comprises the following steps:
(1) weighing various raw materials in proportion;
(2) firstly, adding water into a stirrer, and then adding the fullerene suspension subjected to surface modification; a high-efficiency water reducing agent; an aliphatic compound; sodium gluconate; carboxylic acid-based graft copolymers; and sequentially adding the cellulose into a mixer, stirring and dissolving for 8.5 hours to obtain the ultra-slow release type polycarboxylic acid pumping agent.
The preparation method of the fullerene suspension subjected to surface modification comprises the following steps: adding 1000 parts by mass of ethanol, 10 parts by mass of polyethylene glycol, 36 parts by mass of sodium dodecyl sulfate and 15 parts by mass of hydrophilic fullerene derivative, and sequentially carrying out mechanical stirring, ball milling and ultrasonic reaction treatment to obtain the fullerene suspension subjected to surface modification.
The above articles were subjected to key performance tests, with the results shown in table 3 below:
table 3: key Performance test results for example 3
| Serial number | Test items | Index requirement | Test results |
| 1 | Water loss (%) | ≥12％ | 24 |
| 2 | Water Rate (%) | ≤70 | 58 |
| 3 | Gas content (%) | ≤5.5 | 4.2 |
| 4 | 1h slump change (mm) with time | ≤80 | 71 |
| 5 | Compressive Strength ratio (%) (7 days) | ≥115 | 138 |
| 6 | Compressive Strength ratio (%) (28 days) | ≥110 | 130 |
| 7 | Shrinkage ratio (%) | ≤135 | 90 |
Example 4
A super slow release type polycarboxylic acid pumping agent comprises the following components in percentage by weight: 75% of high-efficiency water reducing agent; 0.65% of fullerene suspension subjected to surface modification; 6.5 percent of nonylphenol polyoxyethylene ether; 4% of sodium gluconate; carboxylic acid graft copolymer 3%; 0.4% of cellulose and the balance of water.
The method for preparing the ultra-slow release type polycarboxylic acid pumping agent comprises the following steps:
(1) weighing various raw materials in proportion;
(2) firstly, adding water into a stirrer, and then adding the fullerene suspension subjected to surface modification; a high-efficiency water reducing agent; an aliphatic compound; sodium gluconate; carboxylic acid-based graft copolymers; and sequentially adding the cellulose into a mixer, stirring and dissolving for 10 hours to obtain the ultra-slow release type polycarboxylic acid pumping agent.
The preparation method of the fullerene suspension subjected to surface modification comprises the following steps: adding 1000 parts by mass of ethanol, 10 parts by mass of polyethylene glycol, 15 parts by mass of sodium dodecyl sulfate and 9 parts by mass of hydrophilic fullerene derivative, and sequentially carrying out mechanical stirring, ball milling and ultrasonic reaction treatment to obtain the fullerene suspension subjected to surface modification.
The above articles were subjected to key performance tests, with the results shown in table 4 below:
table 4: key Performance test results for example 4
| Serial number | Test items | Index requirement | Test results |
| 1 | Water loss (%) | ≥12％ | 27 |
| 2 | Water Rate (%) | ≤70 | 52 |
| 3 | Gas content (%) | ≤5.5 | 3.9 |
| 4 | 1h slump change (mm) with time | ≤80 | 65 |
| 5 | Compressive Strength ratio (%) (7 days) | ≥115 | 140 |
| 6 | Compressive Strength ratio (%) (28 days) | ≥110 | 135 |
| 7 | Shrinkage ratio (%) | ≤135 | 85 |
The pumping aid disclosed by the invention can improve the impermeability, frost resistance and durability of concrete, can reduce the slump loss of the concrete, is good in water reducing property, free of fluorine and low in alkali, free of corrosion on reinforcing steel bars, free of alkali aggregate reaction, suitable for long-distance transportation and pumping construction, and wide in application range, and various technical indexes of the pumping aid disclosed by the invention exceed the standards of 'pumping aid' in GB 8076-2008.
In the above examples 1-4, the fullerene body of the hydrophilic fullerene derivative is a carbon cage containing 50 to 120 carbon atoms, the hydrophilic fullerene derivative contains 1 to 6 flexible ether oxygen chains, and the addition site of a methylene group on the fullerene is one of [5, 6] and [6, 6 ]; the structural formula is:
wherein R1 and R2 are one of phenyl, carbonyl, alkyl, aryl and substituted aryl and any combination thereof;
where n takes any number between 1 and 3.
Comparative example 1
The fullerene suspension subjected to surface modification in example 2 is replaced by water, and the rest of the proportion and the preparation method are unchanged.
Application example
The concrete special pumping aid provided by the embodiments 1-4 and the comparative example 1 of the invention and the comparative example 2 (the pumping aid disclosed in the embodiment 1 of the Chinese patent CN 104098286A) are used as additives to be applied to the preparation of the C50 super high-rise pumping concrete, the performance test is carried out on the obtained C50 super high-rise pumping concrete, and the specific performance test result is shown in Table 5.
The concrete raw material ratio of the C50 super high-rise pumping concrete is as follows: 460kg/cm of cement, mineral powder and fly ash3(ii) a 460kg/cm river sand and gravel3(ii) a The water-to-glue ratio is 0.326; the admixture dosage is 1.2 percent.
Note: the meaning of the admixture mixing amount is as follows: the admixture accounts for the percentage of the total weight of the cementing material (the total weight of cement, mineral powder, fly ash and silica fume).
The cement is P.O42.5 ordinary portland cement; the mineral powder is produced by Wuxin mineral powder factories; the fly ash is Yanghuo II-grade ash; the river sand is river sand with fineness modulus of 2.6; the crushed stone is crushed stone with 5-20mm grain size and continuous gradation.
Table 5: the performance test result of the C50 super high-rise pumping concrete;
the test data show that the super-slow-release polycarboxylic acid pumping agent has good segregation-resistant bleeding property due to the addition of the fullerene suspension subjected to surface modification, and completely meets the requirement of super-high-rise concrete on segregation-resistant bleeding property.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The super slow-release type polycarboxylic acid pumping agent is characterized by comprising the following components in percentage by weight: 60-80% of high-efficiency water reducing agent; 0.5% -1% of fullerene suspension subjected to surface modification; 6% -8% of aliphatic compounds; 1% -5% of sodium gluconate; 1% -5% of carboxylic acid graft copolymer; 0.1 to 0.5 percent of cellulose and the balance of water.
2. The ultra-slow release type polycarboxylic acid pumping agent according to claim 1, which is prepared from the following components in percentage by weight: 75% of high-efficiency water reducing agent; 0.8% of fullerene suspension subjected to surface modification; 6.5% of aliphatic compounds; 4% of sodium gluconate; carboxylic acid graft copolymer 3%; 0.4% of cellulose and the balance of water.
3. The ultra-slow release type polycarboxylic acid pumping agent according to claim 1 or 2, wherein the high-efficiency water reducing agent is a naphthalene-based high-efficiency water reducing agent.
4. The ultra-slow release polycarboxylic acid pumping agent according to claim 1 or 2, wherein said cellulose is formaldehyde cellulose and has a viscosity of 10 ten thousand mPa-s.
5. The method for preparing the ultra-slow release type polycarboxylic acid pumping agent according to any one of claims 1 to 4, characterized by comprising the following steps:
(1) weighing various raw materials in proportion;
(2) firstly, adding water into a stirrer, and then adding the fullerene suspension subjected to surface modification; a high-efficiency water reducing agent; an aliphatic compound; sodium gluconate; carboxylic acid-based graft copolymers; and sequentially adding the cellulose into a mixer to stir for 7-10 hours to obtain the ultra-slow release type polycarboxylic acid pumping agent.
6. The ultra-slow release polycarboxylic acid pumping agent according to claim 5, wherein said method for preparing surface-modified fullerene suspension comprises the following steps: dissolving a surfactant in ethanol, adding a hydrophilic fullerene derivative, and sequentially carrying out mechanical stirring, ball milling and ultrasonic reaction treatment to obtain the fullerene suspension subjected to surface modification.
7. The ultra-sustained release polycarboxylic acid pumping agent according to claim 6, wherein the fullerene body of the hydrophilic fullerene derivative is a carbon cage containing 50 to 120 carbon atoms, the hydrophilic fullerene derivative contains 1 to 6 flexible ether oxygen chains, and the addition site of the methylene group on the fullerene is one of [5, 6] and [6, 6 ]; the structural formula is:
wherein R1 and R2 are one of phenyl, carbonyl, alkyl, aryl and substituted aryl and any combination thereof;
where n takes any number between 1 and 3.
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Cited By (5)
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| CN112062599A (en) * | 2020-09-28 | 2020-12-11 | 史建平 | Preparation method of strong waterproof cement polyphenyl formwork concrete wall |
| CN112081256A (en) * | 2020-09-28 | 2020-12-15 | 史建平 | Preparation method of concrete wall with strong heat insulation cement polyphenyl formwork |
| CN112225521A (en) * | 2020-09-18 | 2021-01-15 | 唐山学院 | Preparation method of building block with super-strong acid and alkali resistance |
| CN112226152A (en) * | 2020-11-12 | 2021-01-15 | 湖州汇邦环保科技有限公司 | Nano reflective industrial paint with strong heat insulation effect |
| CN112812239A (en) * | 2021-01-07 | 2021-05-18 | 青海省兴利公路桥梁工程有限公司 | Preparation process of high-performance polycarboxylic acid water reducer applied to concrete |
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| US20180334407A1 (en) * | 2017-05-17 | 2018-11-22 | Eden Innovations Llc | Methods And Systems For Making Nanocarbon Particle Admixtures And Concrete |
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| CN102992697A (en) * | 2012-12-18 | 2013-03-27 | 苏州市澄湖混凝土有限公司 | Slump-prevention-type concrete pumping aid |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112225521A (en) * | 2020-09-18 | 2021-01-15 | 唐山学院 | Preparation method of building block with super-strong acid and alkali resistance |
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| CN112081256A (en) * | 2020-09-28 | 2020-12-15 | 史建平 | Preparation method of concrete wall with strong heat insulation cement polyphenyl formwork |
| CN112226152A (en) * | 2020-11-12 | 2021-01-15 | 湖州汇邦环保科技有限公司 | Nano reflective industrial paint with strong heat insulation effect |
| CN112812239A (en) * | 2021-01-07 | 2021-05-18 | 青海省兴利公路桥梁工程有限公司 | Preparation process of high-performance polycarboxylic acid water reducer applied to concrete |
| CN112812239B (en) * | 2021-01-07 | 2023-08-25 | 青海省兴利公路桥梁工程有限公司 | Preparation process of high-performance polycarboxylate water reducer applied to concrete |
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Application publication date: 20200710 |