CN112920411A - Concrete viscosity regulator - Google Patents
Concrete viscosity regulator Download PDFInfo
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- CN112920411A CN112920411A CN202110125846.8A CN202110125846A CN112920411A CN 112920411 A CN112920411 A CN 112920411A CN 202110125846 A CN202110125846 A CN 202110125846A CN 112920411 A CN112920411 A CN 112920411A
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- viscosity modifier
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/42—Block-or graft-polymers containing polysiloxane sequences
- C08G77/46—Block-or graft-polymers containing polysiloxane sequences containing polyether sequences
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
- C04B24/42—Organo-silicon compounds
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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
- C04B2103/44—Thickening, gelling or viscosity increasing agents
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Polyethers (AREA)
Abstract
The invention relates to the field of constructional engineering, in particular to a concrete viscosity regulator, which structurally comprises the following 3 parts: a main chain composed of an organosilicon structural unit A and a polyether unit B; a side chain C containing nitrogen atoms is arranged on the side of the main chain; and a borosilicate active end D connected with the tail ends of the main chain and the side chain. The invention overcomes the defects that the concrete viscosity regulator in the prior art can not be simultaneously adapted to the viscosity regulation of the concrete with medium and low elevation and high grade and has a narrow application range, can be simultaneously applied to the viscosity regulation of the concrete with medium and low elevation and high grade, and has a wide application scene.
Description
Technical Field
The invention relates to the field of constructional engineering, in particular to a concrete viscosity regulator.
Background
The concrete viscosity is a key factor influencing the concrete pumping construction performance, and the development and application of the viscosity regulator have important significance on the stability of the concrete working performance. The concrete viscosity regulator is used for regulating the viscosity of concrete and improving the rheological property of the concrete. The application of the concrete viscosity regulator in the preparation of common low-grade concrete or high-strength and high-performance concrete can greatly improve the construction performance of the concrete, and greatly improve the working performance of the concrete while ensuring the mechanical performance of the concrete. The research and application of the concrete viscosity regulator meet the requirements of the current high-performance concrete and are beneficial to promoting the development of high performance of the concrete.
The viscosity regulator in the prior art can be generally divided into a concrete tackifier and a concrete viscosity reducer, but the use scenes of the concrete tackifier and the concrete viscosity reducer in the use process are limited, wherein the concrete tackifier is suitable for low-grade and medium-grade strength concrete, and can increase the viscosity of the concrete and prevent segregation and bleeding phenomena, so that the stability of a concrete system is improved. The concrete viscosity reducer is usually suitable for high-grade concrete, and because the pumping performance of the high-grade concrete is poor, the traditional viscosity regulator is limited by the functions of the traditional viscosity regulator, and the viscosity of the high-grade concrete cannot be improved. Therefore, the existing concrete viscosity regulator cannot be simultaneously adapted to the viscosity regulation of the concrete with medium and low elevation and high grade.
Disclosure of Invention
The invention provides a concrete viscosity regulator to overcome the defects that the concrete viscosity regulator in the prior art cannot be simultaneously adapted to the viscosity regulation of the concrete with medium and low elevation and high grade and has a narrow application range, so that the concrete viscosity regulator can be simultaneously adapted to the concrete with various grades.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a concrete viscosity modifier, the structure of which comprises the following 3 parts:
a main chain composed of an organosilicon structural unit A and a polyether unit B;
a side chain C containing nitrogen atoms is arranged on the side of the main chain;
and a borosilicate active end D connected with the tail ends of the main chain and the side chain.
Preferably, the structural general formula of the organosilicon structural unit A is shown as follows:
Preferably, the ratio of m to n in the organosilicon structural unit A is (10-50): 1.
preferably, the structural formula of the polyether unit B is as follows:
Preferably, the ratio of p to q in the polyether unit B is (10-50): 1.
preferably, the molar ratio of the organosilicon structural unit A to the polyether unit B is 1 (2-5).
Preferably, the structural formula of the side chain C is as follows:
Preferably, the structural general formula of the borosilicate active end D is as follows:
Preferably, the number average molecular weight of the concrete viscosity modifier is 20000-400000.
The invention has the following beneficial effects:
(1) the concrete viscosity regulator is a high molecular polymer, and the main chain of the concrete viscosity regulator is composed of an organic silicon structural unit and a polyether unit, wherein the organic silicon structural unit has certain hydrophobic property, and the polyether unit has hydrophilic property, so that the main chain structure of the whole viscosity regulator has a semi-hydrophobic and semi-hydrophilic effect, the main chain of the concrete viscosity regulator also has a certain surfactant effect, and all components in the concrete can be mixed more stably. In addition, since it can thus reduce the surface activity of the system, it can adjust the viscosity of concrete to some extent when added to concrete.
(2) The side of the main chain is also provided with abundant side chain structures, so that the main chain has excellent adsorption performance, the adsorption density of a polymer on the surface of cement particles is higher, the thickness of an adsorption layer is increased, the yield stress can be obviously reduced, the effect of improving the viscosity of concrete is achieved, the functions of dispersion and viscosity reduction are achieved, the adaptability of the main chain and a polycarboxylic acid water reducing agent is good, and the construction performance under a low water-to-gel ratio is more stable. Therefore, the concrete has a remarkable effect on improving the performance of high-grade strength concrete, so that the rheological performance of the concrete in a shearing state is effectively improved, and the requirement on viscosity for easy pumping construction is met.
(3) According to the invention, the borosilicate active ends are arranged at the tail ends of the main chain and the side chains and can be mutually connected, so that a cross-linked network structure is formed under the condition of no stirring, and the integral viscosity is improved. Under the shearing action of an aqueous system, the crosslinking network can be destroyed, so that the viscosity can be reduced, and the pumping performance is greatly improved. After the pumping is finished, a cross-linked network can be formed again, and the components of the concrete are tightly coated together without segregation, so that the strength of the concrete after curing is greatly improved.
(4) Simultaneously, boron atoms in the borosilicate active end and nitrogen atoms in the side chain can form unstable acting force similar to hydrogen bonds, so that the viscosity of the borosilicate active end in a static state can be improved, the unstable acting force can be decomposed under the shearing action, the viscosity is reduced, pumping is facilitated, the unstable acting force similar to the hydrogen bonds can be formed again after the pumping is finished, and the overall stability of the concrete is effectively improved.
(5) The side chain structure of the invention is polyacrylamide structure, under proper low concentration, the polyacrylamide solution can be regarded as a net structure, the mechanical entanglement and hydrogen bond among chains form net nodes together, and the net nodes are also pseudoplastic fluid and have the characteristic of shear thinning, thereby being convenient for pumping.
(6) The end of the borosilicate active end is of a boric acid structure, and the three borosilicate active ends can form a boron-oxygen hexacyclic structure under the dehydration condition, so that the mechanical strength of the cured concrete is effectively improved.
Detailed Description
The invention is further described with reference to specific examples. Those skilled in the art will be able to implement the invention based on these teachings. Moreover, the embodiments of the present invention described in the following description are generally only some embodiments of the present invention, and not all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
General examples
A concrete viscosity modifier, its structure includes following 3 parts:
a main chain composed of an organosilicon structural unit A and a polyether unit B;
a side chain C containing nitrogen atoms is arranged on the side of the main chain;
and a borosilicate active end D connected with the tail ends of the main chain and the side chain.
The general structural formula is shown as the following formula (V):
formula (V)
Wherein: wherein R1, R2 and R3 in the organosilicon structural unit A are respectively any one of methyl, ethyl, phenyl, vinyl or hydrogen, and the ratio of m to n is (10-50): 1.
in the polyether unit B, R4 is any one of methyl, ethyl or hydrogen, and the ratio of p to q is (10-50): 1.
the molar ratio of the organosilicon structural unit A to the polyether unit B is 1 (2-5).
The range of k in the side chain C is 5-10.
R5 and R6 in the borosilicate active end D are any one of methyl, ethyl, phenyl or hydrogen respectively, and v ranges from 3 to 10.
The concrete viscosity regulator is a high molecular polymer, and the main chain of the concrete viscosity regulator is composed of an organic silicon structural unit and a polyether unit, wherein the organic silicon structural unit has certain hydrophobic property, and the polyether unit has hydrophilic property, so that the main chain structure of the whole viscosity regulator has a semi-hydrophobic and semi-hydrophilic effect, the main chain of the concrete viscosity regulator also has a certain surfactant effect, and all components in the concrete can be mixed more stably. In addition, since it can thus reduce the surface activity of the system, it can adjust the viscosity of concrete to some extent when added to concrete.
The side of the main chain is also provided with abundant side chain structures, so that the main chain has excellent adsorption performance, the adsorption density of a polymer on the surface of cement particles is higher, the thickness of an adsorption layer is increased, the yield stress can be obviously reduced, the effect of improving the viscosity of concrete is achieved, the functions of dispersion and viscosity reduction are achieved, the adaptability of the main chain and a polycarboxylic acid water reducing agent is good, and the construction performance under a low water-to-gel ratio is more stable. Therefore, the concrete has a remarkable effect on improving the performance of high-grade strength concrete, so that the rheological performance of the concrete in a shearing state is effectively improved, and the requirement on viscosity for easy pumping construction is met.
According to the invention, the borosilicate active ends are arranged at the tail ends of the main chain and the side chains and can be mutually connected, so that a cross-linked network structure is formed under the condition of no stirring, and the integral viscosity is improved. Under the shearing action of an aqueous system, the crosslinking network can be destroyed, so that the viscosity can be reduced, and the pumping performance is greatly improved. After the pumping is finished, a cross-linked network can be formed again, and the components of the concrete are tightly coated together without segregation, so that the strength of the concrete after curing is greatly improved.
Simultaneously, boron atoms in the borosilicate active end and nitrogen atoms in the side chain can form unstable acting force similar to hydrogen bonds, so that the viscosity of the borosilicate active end in a static state can be improved, the unstable acting force can be decomposed under the shearing action, the viscosity is reduced, pumping is facilitated, the unstable acting force similar to the hydrogen bonds can be formed again after the pumping is finished, and the overall stability of the concrete is effectively improved.
The side chain structure of the invention is polyacrylamide structure, under proper low concentration, the polyacrylamide solution can be regarded as a net structure, the mechanical entanglement and hydrogen bond among chains form net nodes together, and the net nodes are also pseudoplastic fluid and have the characteristic of shear thinning, thereby being convenient for pumping.
The end of the borosilicate active end is of a boric acid structure, and the three borosilicate active ends can form a boron-oxygen hexacyclic structure under the dehydration condition, so that the mechanical strength of the cured concrete is effectively improved.
Examples 1 to 5
The specific structures of examples 1 to 5 are shown in Table 1 below:
table 1 table of parameters of each example
The viscosity modifiers in embodiments 1-6 of the invention are added to commercial concrete labeled as C30 and C50 in an amount of 0.04% for technical detection, specifically as follows:
1. thickening capacity: the expansion speed refers to the time taken for the concrete to expand to reach 500mm in diameter from the upper body of the slump cone in the process of measuring the slump, so that the speed can represent the plastic viscosity of the concrete to a certain extent, and the expansion speed (T50) is adopted to represent the viscosity of the concrete.
2. Water retention:
in the above test, if it is observed whether bleeding occurs in the concrete during the measurement of slump.
3. Fluidity: the fluidity is the most important index for measuring the working performance of the self-leveling and self-compacting concrete. The invention uses slump and slump expansion to evaluate the fluidity of the self-leveling self-compacting concrete. Slump mainly refers to the plasticizing and pumpability properties of concrete. Slump expansion refers to the maximum diameter that can be achieved after concrete expansion in the process of measuring slump. The slump expansion quantifies the yield stress, viscosity and flow state after friction of concrete under the action of self weight, the expanded concrete is more uniform in quality as the expanded concrete is closer to a circle, and the larger the diameter of the concrete is under the condition that no separation is generated by visual observation, the stronger the capacity of the concrete in passing through gaps is.
4. Segregation resistance:
in the same way, the above test is carried out, and whether the blank group and the viscosity regulator added with the invention have bleeding or bottom grabbing segregation phenomenon is judged visually.
The specific test results are as follows:
table 2C 30 test results for concrete
Table 3C 50 test results for concrete
As can be seen from the observation of tables 2 and 3, the expansion speed of the concrete doped with the viscosity modifier of the invention is effectively increased, which proves the rapid thickening and tackifying capability of the viscosity modifier of the invention when the viscosity modifier is used for self-leveling self-compacting concrete.
Meanwhile, the initial slump of the concrete not doped with the viscosity regulator is obviously reduced with the slump of the concrete after being placed for 2 hours, and the initial slump of the concrete doped with the viscosity regulator is not obviously reduced with the slump of the concrete after being placed for 2 hours, even basically no loss is generated, so that the good slump retaining capability of the viscosity regulator is proved.
And the slump expansion of the concrete mixture doped with the viscosity regulator of the invention can be known from the slump expansion of the concrete, and the initial expansion of the concrete mixture is basically not lost compared with the slump expansion of the concrete after 2 hours; this demonstrates the good slump spread of the viscosity modifier of the invention. Therefore, the invention has good fluidity.
In addition, concrete not doped with the viscosity regulator of the invention has serious phenomena of bleeding and bottom grabbing and has certain segregation; the concrete doped with the viscosity regulator has the advantages of no bleeding, no bottom grabbing, soft material, initial flowability and no segregation.
In conclusion, the viscosity regulator disclosed by the invention has good rapid thickening capability and good water retention property. The viscosity regulator is added into self-leveling self-compacting concrete, increases the slurry viscosity of the concrete mixture, plays a role in thickening, prevents the segregation and bleeding of the concrete, and does not influence the fluidity of the concrete mixture.
Claims (9)
1. A concrete viscosity modifier is characterized in that the structure of the concrete viscosity modifier comprises the following 3 parts:
a main chain composed of an organosilicon structural unit A and a polyether unit B;
a side chain C containing nitrogen atoms is arranged on the side of the main chain;
and a borosilicate active end D connected with the tail ends of the main chain and the side chain.
2. The concrete viscosity modifier according to claim 1, wherein the structural general formula of the organosilicon structural unit A is shown as the following formula (I):
3. The concrete viscosity modifier according to claim 2, wherein the ratio of m to n in the organosilicon structural unit A is (10-50): 1.
4. the concrete viscosity modifier according to claim 1, wherein the structural general formula of the polyether unit B is shown as the following formula (II):
5. The concrete viscosity modifier of claim 4, wherein the ratio of p to q in the polyether unit B is (10-50): 1.
6. the concrete viscosity modifier according to any one of claims 1 to 4, wherein the molar ratio of the organosilicon structural unit A to the polyether unit B is 1 (2 to 5).
7. The concrete viscosity modifier of claim 1, wherein the side chain C has a general structural formula shown in the following formula (III):
8. The concrete viscosity modifier of claim 1, wherein the general structural formula of the borosilicate reactive end D is shown as the following formula (IV):
9. The concrete viscosity modifier according to claim 1, wherein the number average molecular weight of the concrete viscosity modifier is 20000 to 400000.
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| CN202110125846.8A CN112920411B (en) | 2021-01-29 | 2021-01-29 | Concrete viscosity regulator |
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| CN202110125846.8A CN112920411B (en) | 2021-01-29 | 2021-01-29 | Concrete viscosity regulator |
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| CN112920411B CN112920411B (en) | 2022-06-21 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130158159A1 (en) * | 2011-12-19 | 2013-06-20 | Momentive Performance Materials Inc. | Epoxy-containing polysiloxane oligomer compositions, process for making same and uses thereof |
| CN104136446A (en) * | 2012-03-01 | 2014-11-05 | 瓦克化学股份公司 | Cross-linkable compositions based on organosilicon compounds |
| CN109053102A (en) * | 2018-10-15 | 2018-12-21 | 中建铁路投资建设集团有限公司 | A kind of highly resistance folding high fluidity endurance concrete |
| CN109153849A (en) * | 2016-06-28 | 2019-01-04 | 瓦克化学股份公司 | Crosslinkable materials based on organoxysilanes terminated polymer |
| CN109867754A (en) * | 2019-02-22 | 2019-06-11 | 武汉理工大学 | A kind of muting sensitive sense concrete viscosity regulator and preparation method thereof |
-
2021
- 2021-01-29 CN CN202110125846.8A patent/CN112920411B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130158159A1 (en) * | 2011-12-19 | 2013-06-20 | Momentive Performance Materials Inc. | Epoxy-containing polysiloxane oligomer compositions, process for making same and uses thereof |
| CN104136446A (en) * | 2012-03-01 | 2014-11-05 | 瓦克化学股份公司 | Cross-linkable compositions based on organosilicon compounds |
| CN109153849A (en) * | 2016-06-28 | 2019-01-04 | 瓦克化学股份公司 | Crosslinkable materials based on organoxysilanes terminated polymer |
| CN109053102A (en) * | 2018-10-15 | 2018-12-21 | 中建铁路投资建设集团有限公司 | A kind of highly resistance folding high fluidity endurance concrete |
| CN109867754A (en) * | 2019-02-22 | 2019-06-11 | 武汉理工大学 | A kind of muting sensitive sense concrete viscosity regulator and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| JIANG ZHAO ET AL.: ""Study on Optimization of Damping Performance and Damping Temperature Range of Silicone Rubber by Polyborosiloxane Gel"", 《POLYMERS》 * |
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