CN111978004A - Polycarboxylic acid type efficient pumping agent and application thereof - Google Patents
Polycarboxylic acid type efficient pumping agent and application thereof Download PDFInfo
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- CN111978004A CN111978004A CN202010656985.9A CN202010656985A CN111978004A CN 111978004 A CN111978004 A CN 111978004A CN 202010656985 A CN202010656985 A CN 202010656985A CN 111978004 A CN111978004 A CN 111978004A
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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
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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
- C04B2103/34—Flow improvers
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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 polycarboxylic acid type high-efficiency pumping agent, which is mainly prepared by uniformly mixing a polycarboxylic acid water reducing agent, sodium gluconate, white sugar, a defoaming agent, an air entraining agent and clean water according to different proportions. The polycarboxylic acid type high-efficiency pumping agent is suitable for general premixed concrete, high-performance premixed concrete, mass concrete, concrete with dense reinforcing steel bars and difficult vibration parts, high-quality fluid plasticized concrete and the like. The invention is an anionic/nonionic liquid admixture compounded by taking a polycarboxylic acid water reducing agent as a base material, and has the advantages of low chlorine, low alkali, no toxicity, no corrosion, environmental protection and no influence on the ecological environment. The cement has good cost performance and stability, wide application range, simple and convenient operation in the production process and small influence of temperature change.
Description
Technical Field
The invention belongs to the technical field of additive compounding, and particularly relates to a compounded polycarboxylic acid type efficient pumping agent.
Background
The polycarboxylic acid water reducing agent has the advantages of environmental protection, high water reducing rate, small slump loss and the like, is an indispensable component in high-performance concrete, and is a hot field for researching concrete admixtures. Due to the obvious progress of concrete technology and design method, the requirements on the water reducing rate and the cement adaptability of the additive are continuously improved, and especially the development of high-strength, high-fluidity and high-performance concrete puts higher requirements on the additive. The invention aims to provide a polycarboxylic acid type high-efficiency pumping agent which is suitable for common premixed concrete, high-performance premixed concrete, large-volume concrete, concrete at parts which are dense in reinforcing steel bars and are difficult to vibrate, high-quality fluid plasticized concrete and the like.
Disclosure of Invention
The invention provides a polycarboxylic acid type high-efficiency pumping agent which is prepared by the following method according to mass percentage,
respectively putting 10-20% of a water-reducing polycarboxylic acid water reducing agent, 5-20% of a slump-retaining polycarboxylic acid water reducing agent, 1-3% of sodium gluconate, 1-3% of white sugar, 0.1-0.3% of a defoaming agent, 0.1-0.3% of an air entraining agent and the balance of water into a container, adding the materials while stirring during putting, putting all the materials into the container, and stirring uniformly to obtain the polycarboxylic acid high-efficiency pumping aid.
In some embodiments, the water-reducing polycarboxylate water reducer has the formula:
wherein n is 25-50;
the water-reducing polycarboxylic acid water reducing agent is an anionic/nonionic polycarboxylic acid liquid water reducing agent and is characterized by high water reducing, low mixing amount and good durability. Plays a main role in reducing water in the invention; the water reducing component is doped to improve the water reducing rate of the pumping agent, and the water reducing agent can play a role in dispersing cement, so that the adaptability of the pumping agent and the cement is improved, the water cement ratio is reduced, the proportion of free water in concrete is reduced, the phenomenon that the appearance and the internal pores of the concrete are large and dense due to the evaporation of redundant free water is reduced, the compactness of the concrete is improved, and the strength of the concrete is improved.
In some embodiments, the slump-retaining polycarboxylate water reducer has the formula:
wherein m is 15-30;
the main component of the invention is composed of methyl allyl polyoxyethylene ether, which is characterized by high slump retaining property, good plasticity retention property, little slump loss with time, strong adaptability with cement, and has the main slump retaining function in the invention; the cement composite material has the main effects of adsorbing on the surfaces of cement hydrated particles, greatly inhibiting the hydration reaction of the cement hydrated particles, and preventing the formation of a flocculent structure of the cement particles due to the existence of a large amount of charges on the surfaces of the cement particles, thereby ensuring the time-lapse loss of concrete.
Sodium gluconate and white sugar are used as components for adjusting the setting time of the concrete; sodium gluconate is a main retarder in admixture compounding, is sodium polyhydroxy acid, and has a molecular formula as follows: c6H11O7Na, molecular weight 218.13, is readily soluble in water and insoluble in ether;
white sugar (C)12H22O11) Is very soluble in water and ether; the retarder is an additive for adjusting thickening time; the working performance of the retarder is mainly to form a protective film on the surface of cement particles, inhibit cement hydration reaction, generate a retarding effect, reduce the loss of concrete slump over time, and also play a role in adjusting the adaptability of cement and pumping aid.
In some embodiments, the defoamer is C12H27PO4(ii) a Antifoams employed (C)12H27PO4) Effectively controlling the generation of foam in a concrete system, and eliminating foam and unstable large bubbles generated in the concrete construction process; the concrete is more compact and beautiful.
In some embodiments, the air entraining agent is prepared by uniformly stirring 8% of sodium abietate, 1.8% of sodium dodecyl benzene sulfonate, 10% of nonylphenol polyoxyethylene ether, 0.2% of sodium dodecyl sulfate and 80% of water in percentage by mass; the air entraining agent is produced by the inventor of the application, and belongs to one of ether air entraining agents; can improve the fluidity and plasticity of the concrete, reduce bleeding segregation and improve the breaking strength. The pumping pressure can be reduced, and the pumping is facilitated. The concrete cushion can play a role in buffering in the hardening process of the concrete, reduce the damage caused by various types of expansion of the concrete and simultaneously has no influence on the strength of the concrete; and has good adaptability and adsorption resistance to the concrete blended with the fly ash at present.
The polycarboxylic acid type high-efficiency pumping agent is suitable for general premixed concrete, high-performance premixed concrete, mass concrete, concrete with dense reinforcing steel bars and difficult vibration parts, high-quality fluid plasticized concrete and the like.
The invention is an anionic/nonionic liquid admixture compounded by taking a polycarboxylic acid water reducing agent as a base material, and has the advantages of low chlorine, low alkali, no toxicity, no corrosion, environmental protection and no influence on the ecological environment; the cement has good cost performance and stability, wide application range, simple and convenient operation in the production process and small influence of temperature change.
Compared with the common pumping agent (comparative example) used in the current market, the polycarboxylic acid type high-efficiency pumping agent provided by the invention has the advantages of high water reducing rate, small slump loss and high concrete strength.
Detailed Description
The present invention is described in further detail below with reference to specific examples.
The air entraining agent applied in the following examples was the air entraining agent provided in patent No. 200910098907.5; specifically, the air entraining agent is prepared by uniformly stirring 8% of sodium abietate (by weight, the same below), 1.8% of sodium dodecyl benzene sulfonate, 10% of nonylphenol polyoxyethylene ether, 0.2% of sodium dodecyl sulfate and 80% of water.
Example 1
Weighing 72.3% by mass of clear water, 20.0% by mass of a water-reducing polycarboxylic acid water reducing agent, 5.0% by mass of sodium gluconate with the mass percentage of 1.5% of a slump-retaining polycarboxylic acid water reducing agent, 1.0% by mass of white sugar, 0.1% by mass of a defoaming agent and 0.1% by mass of an air entraining agent, respectively putting into a beaker, adding while stirring during putting, putting all the materials into the beaker, and stirring uniformly to obtain the polycarboxylic acid type high-efficiency pumping aid.
Example 2
Weighing 72.3% by mass of clear water, 15.0% by mass of a water-reducing polycarboxylic acid water reducing agent, 10.0% by mass of a slump-retaining polycarboxylic acid water reducing agent, 1.5% by mass of sodium gluconate, 1.0% by mass of white sugar, 0.1% by mass of a defoaming agent and 0.1% by mass of an air entraining agent, respectively putting into a beaker, adding while stirring during putting, putting all the materials into the beaker, and stirring uniformly to obtain the polycarboxylic acid type efficient pumping aid.
Example 3
Weighing 72.3% by mass of clear water, 10.0% by mass of a water-reducing polycarboxylic acid water reducing agent, 15.0% by mass of a slump-retaining polycarboxylic acid water reducing agent, 1.5% by mass of sodium gluconate, 1.0% by mass of white sugar, 0.1% by mass of a defoaming agent and 0.1% by mass of an air entraining agent, respectively putting into a beaker, adding while stirring during putting, putting all the materials into the beaker, and stirring uniformly to obtain the polycarboxylic acid type efficient pumping aid.
Comparative example
Weighing 23.4% by mass of clear water, 75.0% by mass of naphthalene water reducer, 1.5% by mass of sodium gluconate and 0.1% by mass of air entraining agent, respectively putting into a beaker, adding all the materials while stirring, and uniformly stirring to obtain the comparative example.
Test examples
The water reducing rate, slump loss and strength of the concrete admixture in examples 1-3 and comparative example are detected according to the detection method in GB8076-2008, concrete admixture, and the use of reference cement is detected, wherein the mixing amount of the reference cement is 1.8% of the mass of the cement.
TABLE 1 concrete mix proportion (unit: kg)
TABLE 2 concrete Performance test results for different pumping agents
As shown in the detection results of Table 2, compared with the common pumping agent (comparative example) used in the market at present, the polycarboxylic acid type high-efficiency pumping agent prepared by the invention has the advantages of environmental protection, high water reducing rate, small slump loss and high concrete strength.
Claims (6)
1. A polycarboxylic acid type high-efficiency pumping agent is characterized in that the polycarboxylic acid type high-efficiency pumping agent is prepared by the following method according to mass percentage,
respectively putting 10-20% of a water-reducing polycarboxylic acid water reducing agent, 5-20% of a slump-retaining polycarboxylic acid water reducing agent, 1-3% of sodium gluconate, 1-3% of white sugar, 0.1-0.3% of a defoaming agent, 0.1-0.3% of an air entraining agent and the balance of water into a container, adding the materials while stirring during putting, putting all the materials into the container, and stirring uniformly to obtain the polycarboxylic acid high-efficiency pumping aid.
2. The polycarboxylic acid type high-efficiency pumping aid as claimed in claim 1, wherein the water-reducing polycarboxylic acid water reducing agent has the molecular formula:
wherein n is 25-50.
3. The polycarboxylic acid type high-efficiency pumping aid according to claim 1, wherein the slump-retaining polycarboxylic acid water reducing agent has the molecular formula:
wherein m is 15-30.
4. The polycarboxylic acid type high-efficiency pumping agent according to claim 1, wherein the antifoaming agent is C12H27PO4。
5. The polycarboxylic acid type high-efficiency pumping aid according to claim 1, wherein the air entraining agent is prepared by uniformly stirring 8% by mass of sodium abietate, 1.8% by mass of sodium dodecylbenzenesulfonate, 10% by mass of nonylphenol polyoxyethylene ether, 0.2% by mass of sodium dodecylsulfate and 80% by mass of water.
6. The polycarboxylic acid type high efficiency pumping agent as claimed in claim 1 or 2 or 3 or 4 or 5, which is used for general ready mixed concrete, high performance ready mixed concrete, large volume concrete, concrete of reinforcing steel bar dense portion which is not easy to be vibrated and high quality fluid state plasticized concrete.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010656985.9A CN111978004A (en) | 2020-07-09 | 2020-07-09 | Polycarboxylic acid type efficient pumping agent and application thereof |
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| CN202010656985.9A CN111978004A (en) | 2020-07-09 | 2020-07-09 | Polycarboxylic acid type efficient pumping agent and application thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112777990A (en) * | 2021-01-11 | 2021-05-11 | 山东大学 | Solid waste base light heat-insulating concrete 3D printing material and preparation method thereof |
| CN113955971A (en) * | 2021-12-08 | 2022-01-21 | 眉山海螺新材料科技有限公司 | Mud-resistant adsorption-resistant polycarboxylic acid high-performance pumping agent |
| CN113955972A (en) * | 2021-12-08 | 2022-01-21 | 眉山海螺新材料科技有限公司 | Seventy-two-hour ultra-retarding polycarboxylic acid pumping aid and preparation method thereof |
| CN117800637A (en) * | 2023-12-29 | 2024-04-02 | 浙江五龙新材股份有限公司 | Polycarboxylic acid pumping aid and preparation process thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112777990A (en) * | 2021-01-11 | 2021-05-11 | 山东大学 | Solid waste base light heat-insulating concrete 3D printing material and preparation method thereof |
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| CN113955971A (en) * | 2021-12-08 | 2022-01-21 | 眉山海螺新材料科技有限公司 | Mud-resistant adsorption-resistant polycarboxylic acid high-performance pumping agent |
| CN113955972A (en) * | 2021-12-08 | 2022-01-21 | 眉山海螺新材料科技有限公司 | Seventy-two-hour ultra-retarding polycarboxylic acid pumping aid and preparation method thereof |
| CN117800637A (en) * | 2023-12-29 | 2024-04-02 | 浙江五龙新材股份有限公司 | Polycarboxylic acid pumping aid and preparation process thereof |
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Application publication date: 20201124 |