CN108892412B - Admixture special for lightweight aggregate concrete and preparation process thereof - Google Patents
Admixture special for lightweight aggregate concrete and preparation process thereof Download PDFInfo
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- CN108892412B CN108892412B CN201810824278.9A CN201810824278A CN108892412B CN 108892412 B CN108892412 B CN 108892412B CN 201810824278 A CN201810824278 A CN 201810824278A CN 108892412 B CN108892412 B CN 108892412B
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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
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a lightweight aggregate concrete special additive and a preparation process thereof, wherein the lightweight aggregate concrete special additive comprises the following components in parts by weight: 190 portions of polycarboxylic acid water reducing agent 160; 100 parts of slump retaining agent and 130 parts of slump retaining agent; 20-28 parts of sodium gluconate; 0.5-1.5 parts of hydroxypropyl cellulose; 8-15 parts of a thickening agent; 1-1.9 parts of an air entraining agent; 10-24 parts of sodium nitrite; 589.6 to 665.2 portions of water. After the special admixture for the lightweight aggregate concrete is added into the lightweight aggregate concrete and mixed, the workability and the wrapping property of the lightweight aggregate concrete can be improved, and the floating of the lightweight aggregate is reduced.
Description
Technical Field
The invention relates to the technical field of additives, in particular to a special additive for lightweight aggregate concrete and a preparation process thereof.
Background
The lightweight aggregate concrete is concrete using lightweight aggregate, and has apparent density of 1950kg/m or less3. The lightweight aggregate concrete has the characteristic of light weight, and with the improvement of requirements on building energy conservation and building functionality, the research and development of the high-performance lightweight aggregate concrete are rapidly developed, but further efforts are needed to make the research on the high-performance lightweight aggregate concrete mature. Therefore, the research on the high-performance lightweight aggregate concrete is actively carried out, and the significance is very obvious.
However, since the lightweight aggregate has a low density, the lightweight aggregate in the lightweight aggregate concrete is likely to float during the process of stirring the lightweight aggregate concrete, so that the whole workability of the lightweight aggregate concrete is poor and the slump is low. At present, the admixture has great influence on the overall performance of the lightweight aggregate concrete, so the research and development of the admixture special for the lightweight aggregate concrete, which can improve the workability of the lightweight aggregate concrete, has wide market prospect.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the admixture special for the lightweight aggregate concrete, which has better fluidity, and has the advantages of increasing the workability and the wrapping property of the lightweight aggregate concrete and reducing the floating of the lightweight aggregate in the mixing process of the admixture with the lightweight aggregate concrete.
In order to achieve the first purpose, the invention provides the following technical scheme:
the admixture special for the lightweight aggregate concrete is characterized by comprising the following components in parts by weight:
190 portions of polycarboxylic acid water reducing agent 160;
100 parts of slump retaining agent and 130 parts of slump retaining agent;
20-28 parts of sodium gluconate;
0.5-1.5 parts of hydroxypropyl cellulose;
8-15 parts of a thickening agent;
1-1.9 parts of an air entraining agent;
10-24 parts of sodium nitrite;
589.6 to 665.2 portions of water.
Through above-mentioned technical scheme, polycarboxylate water reducing agent can reduce the mix water consumption under the condition of keeping concrete slump unchangeable basically, still can have the dispersion to the cement granule, improves the mobility of concrete mixture. The sodium gluconate has the function of retarding coagulation of concrete, and the sodium nitrite has the function of early strength, so that the early strength of the reinforced concrete can be improved. The hydroxypropyl cellulose has nonionic property, can improve the stability of the whole additive system, and is not easily influenced by the pH value of the system.
Researches (slump tests and air content tests) show that sodium gluconate, hydroxypropyl cellulose and sodium nitrite are matched with each other to form the admixture, so that the formed admixture is beneficial to improving the full coating of the admixture on lightweight aggregate and preventing the lightweight aggregate from floating upwards in the process of mixing with the lightweight aggregate concrete, and the workability and the wrapping property of the lightweight aggregate concrete are improved.
More preferably: the admixture special for the lightweight aggregate concrete comprises the following components in parts by weight:
180 portions of polycarboxylic acid water reducing agent 160;
100 portions of slump retaining agent and 120 portions of slump retaining agent;
20-25 parts of sodium gluconate;
0.5-1 part of hydroxypropyl cellulose;
8-13 parts of a thickening agent;
1-1.5 parts of an air entraining agent;
10-20 parts of sodium nitrite;
651-665.2 parts of water.
More preferably: the admixture special for the lightweight aggregate concrete also comprises 5 to 10 parts of molasses by weight.
More preferably: the molasses comprises at least one of cane molasses, corn molasses and beet molasses.
More preferably: also comprises 8-15 parts by weight of polysorbate-80.
Through the technical scheme, the cane molasses, the corn molasses and the beet molasses have high yield and viscosity, the retarding effect, the stability and the adhesion of a system can be improved in an additive system, the additive has good matching effect with the hydroxypropyl cellulose, has a wrapping effect on the lightweight aggregate, and reduces the possibility of the lightweight aggregate floating. The polysorbate-80 is easy to dissolve in water, has excellent stability and diffusivity, has a good matching effect with the hydroxypropyl cellulose, and is beneficial to improving the stability of the whole additive system. And after being mixed with various components of the lightweight aggregate concrete, the composite material can form uniform connection effect with the lightweight aggregate concrete.
More preferably: the slump retaining agent is a polycarboxylic acid slump retaining agent.
More preferably: the thickening agent comprises at least one of polyacrylamide, polyvinyl alcohol and sodium polyacrylate.
More preferably: the air entraining agent comprises at least one of alkyl sulfonate air entraining agents, saponin compound air entraining agents and modified rosin thermopolymer air entraining agents.
Through the technical scheme, the polycarboxylic acid slump retaining agent can improve the cohesiveness of the concrete mixture, improve the segregation resistance and bleeding resistance of the concrete mixture, and enable the concrete mixture to obtain better slump. The polycarboxylic acid slump retaining agent and the polycarboxylic acid water reducing agent are matched together to ensure the fluidity and the operable time of the lightweight aggregate concrete. The polyacrylamide, polyvinyl alcohol and sodium polyacrylate can make the formed admixture have a certain viscosity, so that the concrete mixture is more stable, and the phenomena of bottom grabbing and hardening of the concrete mixture are overcome. The alkyl sulfonate air entraining agent, the saponin compound air entraining agent and the modified rosin thermopolymer air entraining agent all introduce the function of micro bubbles, improve the wrapping effect on the lightweight aggregate, and are not easy to float the lightweight aggregate, thereby improving the workability of the lightweight aggregate concrete.
The second purpose of the invention is to provide a preparation process of the admixture special for lightweight aggregate concrete.
In order to achieve the second purpose, the invention provides the following technical scheme:
a preparation process of a special admixture for lightweight aggregate concrete comprises the following steps:
s1, uniformly mixing hydroxypropyl cellulose, a thickening agent and sodium gluconate in corresponding parts by weight to form a first mixture;
s2, adding the first mixture obtained in the step S1 into water with corresponding weight parts, and fully dissolving the first mixture by stirring to obtain a second mixture;
and S3, sequentially adding an air entraining agent, sodium nitrite, a polycarboxylic acid water reducing agent and a slump retaining agent into the second mixture obtained in the step S2, wherein the time interval between the addition of each component is 3-4 min, and continuously stirring for 10-15 min after the slump retaining agent is added, so as to obtain the special admixture for the lightweight aggregate concrete.
More preferably: in the step S2, the molasses and the polysorbate-80 with corresponding weight parts are added, and the mixture is uniformly mixed with the water and the first mixture.
Through the technical scheme, the viscosity degree and the bonding performance of the first mixture are increased to a certain extent, the formed second mixture is added with the thickening agent, and the viscosity of the whole liquid phase system is further increased. The order of the components added is arranged in such a way as to contribute to a uniform and stable state of the admixture for lightweight-aggregate concrete to be formed, and the energy consumption required for mixing in steps S1 and S2 is small, thereby reducing the energy consumption required for production as a whole.
In conclusion, the invention has the following beneficial effects:
1. the sodium gluconate, the hydroxypropyl cellulose and the sodium nitrite are matched with each other, so that the formed admixture has a stable and uniform state, and has a sufficient wrapping effect on the lightweight aggregate after being mixed with the lightweight aggregate concrete, so that the lightweight aggregate is easy to be uniformly mixed, the workability of the lightweight aggregate concrete is improved, and the slump is improved;
2. the molasses, the polysorbate-80, the sodium gluconate, the hydroxypropyl cellulose and the sodium nitrite form a compounding effect, so that the bonding performance and the flowing new performance of the admixture are improved, and after the admixture is mixed with the lightweight aggregate concrete, bubbles in the lightweight aggregate concrete can be broken or discharged, and the reduction of the gas content in the lightweight aggregate concrete is facilitated.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1: the admixture special for the lightweight aggregate concrete comprises the components and the corresponding parts by weight shown in table 1, and is prepared by the following steps:
s1, uniformly mixing hydroxypropyl cellulose, a thickening agent and sodium gluconate to form a mixture; forming a first mixture;
s2, adding the first mixture obtained in the step S1 into water, and fully dissolving the first mixture by stirring to obtain a second mixture;
and S3, sequentially adding an air entraining agent, sodium nitrite, a polycarboxylic acid water reducing agent and a slump retaining agent into the second mixture obtained in the step S2, wherein the time interval between the addition of each component is 3-4 min, and continuously stirring for 10-15 min after the slump retaining agent is added, so as to obtain the special admixture for the lightweight aggregate concrete.
Wherein the thickening agent is a mixture of polyacrylamide, polyvinyl alcohol and sodium polyacrylate with the weight part of 1: 1; the air entraining agent is alkyl sulfonate air entraining agent.
Examples 2 to 5: the admixture for lightweight aggregate concrete is different from the admixture of example 1 in that the components and the corresponding parts by weight thereof are shown in Table 1.
TABLE 1 examples 1-5 include the components and their corresponding parts by weight
Example 6: the admixture special for the lightweight aggregate concrete is different from the admixture of the embodiment 1 in that molasses is a mixture of cane molasses, corn molasses and beet molasses, and the proportion of the cane molasses, the corn molasses and the beet molasses is 1: 1.5: 1.
Example 7: the admixture special for the lightweight aggregate concrete is different from the admixture of the embodiment 1 in that molasses is a mixture of cane molasses and corn molasses, and the proportion of the cane molasses to the corn molasses is 2.5: 1.
Example 8: the admixture for lightweight aggregate concrete is different from the admixture in example 1 in that molasses and polysorbate-80 are not included.
Example 9: the admixture for lightweight-aggregate concrete was different from example 1 in that molasses was not included.
Example 10: the admixture for lightweight-aggregate concrete was different from example 1 in that polysorbate-80 was not included.
Example 11: the admixture special for the lightweight aggregate concrete is different from the admixture in the embodiment 1 in that the thickening agent is a mixture of polyacrylamide and hydrophobic modified acrylate copolymer with the weight portion of 1: 2; the air entraining agent is alkyl sulfonate air entraining agent and saponin composite air entraining agent in the weight ratio of 1 to 1.
Comparative example 1: the admixture special for the lightweight aggregate concrete is different from the admixture in the embodiment 1 in that the raw material composition does not contain sodium gluconate, hydroxypropyl cellulose, sodium nitrite, molasses, polysorbate-80 and an air entraining agent.
Comparative example 2: the admixture special for the lightweight aggregate concrete is different from the admixture in the embodiment 1 in that the raw material composition does not contain sodium gluconate, hydroxypropyl cellulose and sodium nitrite.
Comparative example 3: the admixture special for the lightweight aggregate concrete is different from the admixture in the embodiment 1 in that in the preparation process, a polycarboxylic acid water reducing agent, a slump retaining agent, sodium gluconate, hydroxypropyl cellulose, a thickening agent, an air entraining agent, sodium nitrite, water, molasses and polysorbate-80 are mixed together for 20 min.
Test one: slump and air content test
The test method comprises the following steps: PO42.5R cement 0.472t and fine sand 0.53m30.59m of ceramsite with particle size less than 20mm3And 0.220t of water, fully stirring and mixing to form a lightweight aggregate concrete mixture, testing the slump of the lightweight aggregate concrete mixture, wherein the initial slump is 225mm, and the slump after 60min is 215mm, and taking the slump as a basic record; 14 groups of lightweight-aggregate concrete mixtures were prepared, and 7.5kg of the lightweight-aggregate concrete admixture of examples 1 to 11 and the admixture of comparative examples 1 to 3 were added to 15 groups of lightweight-aggregate concrete mixtures, respectively, and sufficiently mixed, which were designated as test samples 1 to 11 and control samples 1 to 3, respectivelyThen, slump detection is carried out on the test samples 1-11 and the control samples 1-3, and data are recorded and analyzed; the air content of each group of lightweight aggregate concrete mixtures was measured according to GBT14902-2012, and recorded and analyzed as test samples 1-11 and control samples 1-3, respectively.
And (3) test results: slump, air content and appearance of the test samples 1 to 11 and the control samples 1 to 3 are shown in Table 2.
TABLE 2 slump, air content, appearance of test samples 1-11 and control samples 1-3
As can be seen from Table 2, the initial slump of the test samples 1 to 11 is higher than that of the lightweight aggregate concrete mixture without the additive, and the slump of the test samples 1 to 11 is slightly changed after 120min, while the slump of the lightweight aggregate concrete mixture without the additive is obviously reduced after 60 min. However, in the control samples 1 to 3, the slump after 120min was almost reduced to half of that at the beginning. And the test samples 1 to 11 and the comparison samples 1 to 3 are observed from the appearance, and the test samples 1 to 11 are not separated and do not bleed, the lightweight aggregate is wrapped, no lightweight aggregate floating phenomenon occurs, and the comparison samples 1 to 3 have the lightweight aggregate floating phenomenon of different degrees. The above differences indicate that: the sodium gluconate, the hydroxypropyl cellulose and the sodium nitrite act together to increase the consistency of slurry in the lightweight aggregate concrete, so that the slurry is more stable and uniform and has better wrapping effect on the lightweight aggregate.
In addition, it can be seen from Table 2 that the gas content in the control samples 1-2 is significantly lower than that of the test samples 1-11, wherein the gas content in the control sample 1 is the lowest. The above differences indicate that: the molasses, the polysorbate-80, the sodium gluconate, the hydroxypropyl cellulose, the sodium nitrite and the air entraining agent act together to increase the gas content and the stability of the lightweight aggregate concrete mixture slurry, so that the lightweight aggregate can be uniformly distributed in a concrete structure after the lightweight aggregate concrete is poured, and the quality stability of the lightweight aggregate concrete structure is improved.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (6)
1. The admixture special for the lightweight aggregate concrete is characterized by comprising the following components in parts by weight:
190 portions of polycarboxylic acid water reducing agent 160;
100 parts of slump retaining agent and 130 parts of slump retaining agent;
20-28 parts of sodium gluconate;
0.5-1.5 parts of hydroxypropyl cellulose;
8-15 parts of a thickening agent;
1-1.9 parts of an air entraining agent;
10-24 parts of sodium nitrite;
589.6-665.2 parts of water;
5-10 parts of molasses;
8-15 parts of polysorbate-80;
the molasses comprises at least one of cane molasses, corn molasses and beet molasses;
the preparation process of the admixture special for the lightweight aggregate concrete comprises the following steps:
s1, uniformly mixing hydroxypropyl cellulose, a thickening agent and sodium gluconate in corresponding parts by weight to form a first mixture;
s2, adding the first mixture obtained in the step S1 into water with corresponding weight parts, and fully dissolving the first mixture by stirring to obtain a second mixture;
and S3, sequentially adding an air entraining agent, sodium nitrite, a polycarboxylic acid water reducing agent and a slump retaining agent into the second mixture obtained in the step S2, wherein the time interval between the addition of each component is 3-4 min, and continuously stirring for 10-15 min after the slump retaining agent is added, so that the special admixture for the lightweight aggregate concrete is obtained.
2. The admixture special for lightweight aggregate concrete according to claim 1, which comprises the following components in parts by weight:
180 portions of polycarboxylic acid water reducing agent 160;
100 portions of slump retaining agent and 120 portions of slump retaining agent;
20-25 parts of sodium gluconate;
0.5-1 part of hydroxypropyl cellulose;
8-13 parts of a thickening agent;
1-1.5 parts of an air entraining agent;
10-20 parts of sodium nitrite;
651-665.2 parts of water.
3. The admixture special for lightweight aggregate concrete according to claim 1 or 2, wherein the slump retaining agent is a polycarboxylic acid type slump retaining agent.
4. The admixture special for lightweight aggregate concrete according to claim 1 or 2, wherein the thickener comprises at least one of polyacrylamide, polyvinyl alcohol and sodium polyacrylate.
5. The admixture special for lightweight aggregate concrete according to claim 1 or 2, wherein the air-entraining agent comprises at least one of alkyl sulfonate type air-entraining agent, saponin type composite air-entraining agent and modified rosin thermopolymer type air-entraining agent.
6. The admixture as claimed in claim 1, wherein in step S2, molasses and polysorbate-80 are added in corresponding weight portions, and mixed with water and the first mixture.
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| CN201810824278.9A CN108892412B (en) | 2018-07-24 | 2018-07-24 | Admixture special for lightweight aggregate concrete and preparation process thereof |
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| CN108892412B true CN108892412B (en) | 2021-02-02 |
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| CN113735486B (en) * | 2021-09-12 | 2022-06-21 | 中建西部建设贵州有限公司 | Additive for light high-strength concrete and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101891414A (en) * | 2010-07-07 | 2010-11-24 | 广东省长大公路工程有限公司 | Polycarboxylic acid type special additive for lightweight aggregate concrete |
| CN102531447A (en) * | 2011-12-12 | 2012-07-04 | 山西潞安矿业(集团)有限责任公司 | Special additive for lytag concrete |
| CN105174875A (en) * | 2015-10-15 | 2015-12-23 | 重庆富皇混凝土有限公司 | High-fluidity pumping ceramsite concrete and preparation method thereof |
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- 2018-07-24 CN CN201810824278.9A patent/CN108892412B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101891414A (en) * | 2010-07-07 | 2010-11-24 | 广东省长大公路工程有限公司 | Polycarboxylic acid type special additive for lightweight aggregate concrete |
| CN102531447A (en) * | 2011-12-12 | 2012-07-04 | 山西潞安矿业(集团)有限责任公司 | Special additive for lytag concrete |
| CN105174875A (en) * | 2015-10-15 | 2015-12-23 | 重庆富皇混凝土有限公司 | High-fluidity pumping ceramsite concrete and preparation method thereof |
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