CN111908882A - Reinforcing fiber anti-crack reinforcing steel bar sleeve grouting material and preparation method thereof - Google Patents
Reinforcing fiber anti-crack reinforcing steel bar sleeve grouting material and preparation method thereof Download PDFInfo
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- CN111908882A CN111908882A CN202010806644.5A CN202010806644A CN111908882A CN 111908882 A CN111908882 A CN 111908882A CN 202010806644 A CN202010806644 A CN 202010806644A CN 111908882 A CN111908882 A CN 111908882A
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- Prior art keywords
- grouting material
- cement
- reinforced fiber
- steel bar
- parts
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Classifications
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention provides a reinforced fiber anti-crack reinforcing steel bar sleeve grouting material and a preparation method thereof, and relates to the technical field of concrete materials. The grouting material comprises the following raw materials in parts by weight: 37-55 parts of sand and stone, 26-36 parts of cement, 0.5-1.6 parts of gypsum, 5.8-11.6 parts of slag powder, 1.3-6.6 parts of coal dust, 0.4-4.0 parts of silica micropowder, 0.3-0.5 part of water reducing agent, 0.02-0.04 part of defoaming agent, 0.03-0.05 part of retarder, 0.03-0.05 part of expanding agent and 0.06-0.09 part of reinforcing fiber; the cement is the combination of sulphoaluminate cement and portland cement, wherein the sulphoaluminate cement accounts for 10-30% by mass of the cement, and the portland cement accounts for 70-90% by mass of the cement. The grouting material has the performances of good fluidity, high early strength, micro-expansion crack resistance, repeated tension and compression resistance and the like, and is suitable for the connection construction of an assembled concrete structure.
Description
Technical Field
The invention relates to the technical field of concrete materials, in particular to a reinforced fiber anti-crack reinforcing steel bar sleeve grouting material and a preparation method thereof.
Background
The prefabricated concrete structure is an important structural form for the industrialized development of houses, has the advantages of high efficiency, low energy consumption, environmental protection, high product quality and the like, and meets the current economic and social development requirements of China. The connection of the member nodes is one of the key technologies of the fabricated concrete structure. At present, the steel bar sleeve connecting technology is commonly adopted among assembly type building components. The reliability of the grouting connection of the steel bar sleeve is an important guarantee for the integrity and the seismic performance of the fabricated concrete structure; meanwhile, the properties of the grouting material, such as early strength, crack resistance and the like, play a vital role in the safety and durability of the fabricated concrete structure.
The existing sleeve grouting material has the problems of poor fluidity, large loss of fluidity with time, low early mechanical strength, volume shrinkage cracking and the like, is difficult to meet the technical requirements of steel bar sleeve connection, and restricts the development of an assembled concrete structure.
Disclosure of Invention
In view of the above, there is a need to provide a reinforcing fiber anti-cracking reinforcing steel sleeve grouting material, which has the properties of good fluidity, high early strength, micro-expansion crack resistance, repeated tension and compression resistance and the like, and is suitable for the connection construction of the fabricated concrete structure.
The reinforced fiber anti-crack reinforcing steel bar sleeve grouting material comprises the following raw materials in parts by weight:
the cement is the combination of sulphoaluminate cement and portland cement, wherein the sulphoaluminate cement accounts for 10-30% by mass of the cement, and the portland cement accounts for 70-90% by mass of the cement.
The grouting material adopts a sulphoaluminate cement-portland cement-gypsum multi-element compound system, fully utilizes the characteristics of a cementing material, has complementary performances among raw materials and synergistic interaction, solves the problems of low early strength, volume shrinkage and too fast condensation in the later period of the conventional grouting material for the reinforcing sleeve, obviously improves the early strength and expansibility of the grouting material for the reinforcing sleeve, and ensures the reliability of construction; aiming at the characteristics of grouting connection of the steel bar sleeve, the reinforcing fiber is doped, so that the bond stress and expansibility of the grouting material and the steel bar are greatly improved, the stress and repeated anti-drawing capability of the grouting connection of the steel bar sleeve are obviously improved, and the steel bar sleeve has good anti-seismic performance in engineering application; and the external agents such as a water reducing agent, a defoaming agent, an expanding agent and the like are reasonably doped, so that the grouting material is ensured to have better construction operability, and the initial fluidity and the grouting property are improved.
In one embodiment, the sand is selected from: artificial and/or river sand; the particle size of the sand is less than or equal to 1.18mm, the sand is in continuous gradation, and the mud content of the sand is less than or equal to 1%.
The sand stone with continuous gradation is used as fine aggregate, so that the production cost is reduced, the fluidity is improved, and the filling property of the grouting material is improved.
In one embodiment, the sulphoaluminate cement has a strength grade of 42.5 and the Portland cement has a strength grade of 42.5.
In one embodiment, S95-grade mineral powder is selected as the slag powder, and the specific surface area of the slag powder is more than or equal to 4500cm2/g。
In one embodiment, the fly ash is class F class ii fly ash.
In one embodiment, the content of silicon dioxide in the silicon micro powder is more than or equal to 99%, and the particle size of the silicon micro powder is 800-1200 meshes.
In one embodiment, the water reducing agent is a powdery polycarboxylic acid high-performance water reducing agent, and the water reducing rate of the water reducing agent is more than or equal to 35%.
In one embodiment, the defoaming agent is a powdery organic silicon defoaming agent, and the silicon content in the defoaming agent is more than or equal to 99.5%.
In one embodiment, the retarder is sodium citrate.
In one embodiment, the swelling agent is selected from: calcium sulphoaluminate swelling agent and/or calcium oxide swelling agent.
In one embodiment, the reinforcing fibers are selected from: one or more than two of polyethylene fiber, glass fiber and polypropylene fiber; the diameter of the reinforced fiber is less than or equal to 80 mu m, and the length of the reinforced fiber is 0.8-1.2 mm.
The invention also provides a preparation method of the grouting material, which comprises the following steps: weighing the raw materials, adding water and mixing uniformly to obtain the reinforced fiber anti-crack reinforcing steel bar sleeve grouting material.
In one embodiment, the preparation method comprises the following steps:
s1, weighing the raw materials in parts by weight, and mixing to obtain grouting material dry powder;
s2, adding water into the dry grouting material powder, wherein the water adding amount is 11% -14% of the weight of the dry grouting material powder, and stirring at a low speed of 140 +/-5 rpm for 4-6 min and at a high speed of 285 +/-10 rpm for 2-4 min by adopting a standard JC/T681 planetary cement mortar stirrer to obtain the reinforced fiber anti-crack reinforcing steel bar sleeve grouting material.
Compared with the prior art, the invention has the following beneficial effects:
the reinforced fiber anti-crack reinforcing steel bar sleeve grouting material disclosed by the invention adopts a sulphoaluminate cement-Portland cement-gypsum multi-component compound system, the characteristics of a cementing material are fully utilized, the performances of the raw materials are complementary, and the synergistic effect is realized, so that the problems of low early strength, shrinkage of later volume and over-quick condensation of the conventional reinforcing steel bar sleeve grouting material are solved, the early strength and expansibility of the reinforcing steel bar sleeve grouting material are obviously improved, and the construction reliability is ensured; aiming at the characteristics of grouting connection of the steel bar sleeve, the reinforcing fiber is doped, so that the bond stress and expansibility of the grouting material and the steel bar are greatly improved, the stress and repeated anti-drawing capability of the grouting connection of the steel bar sleeve are obviously improved, and the steel bar sleeve has good anti-seismic performance in engineering application; and the external agents such as a water reducing agent, a defoaming agent, an expanding agent and the like are reasonably doped, so that the grouting material is ensured to have better construction operability, and the initial fluidity and the grouting property are improved. The grouting material has the advantages of high early and later strength, good fluidity, micro-expansion crack resistance and the like, is suitable for the grouting connection of the steel sleeve, has advantages in the connection engineering of the prefabricated concrete structure, and is beneficial to the popularization of the prefabricated concrete structure.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the preferred embodiments. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Example 1
The reinforced fiber anti-crack reinforcing steel bar sleeve grouting material is prepared by the following method:
(1) weighing the following raw materials in parts by weight, and mixing the raw materials to obtain the grouting material dry powder:
46 parts of common river sand with the maximum particle size of 1.18mm, 7.2 parts of 42.5 sulphoaluminate cement, 28.8 parts by mass of 42.5 common Portland cement, 1.6 parts of gypsum, 10.98 parts of S95-grade mineral powder, 4.94 parts of F-class II-grade fly ash, 1.65 parts of silicon micropowder (the content of silicon dioxide is more than or equal to 99 percent and the particle size is 1000 meshes), 0.44 part of polycarboxylic acid high-performance water reducing agent (Xika, type 540P and white powder), 0.04 part of expanding agent (Xika, the apparent density is 300-600 g/L and yellow crystal powder), 0.05 part of sodium citrate, 0.03 part of defoaming agent (Xika, type DF770DD and white powder) and 0.09 part of polyethylene fiber (the diameter is 80 mu m and the length is 0.8 mm).
(2) The raw materials are uniformly mixed, 1 part by mass of grouting material dry powder is mixed with 0.12 part by mass of water, the mixture is stirred in a mortar stirrer, the stirring speed is firstly 140rpm for 5min, and then the stirring speed is 285rpm for 3min, so that the grouting material is prepared.
Example 2
The reinforced fiber anti-crack reinforcing steel bar sleeve grouting material is prepared by the following method:
(1) weighing the following raw materials in parts by weight, and mixing the raw materials to obtain the grouting material dry powder:
55 parts of common river sand with the maximum particle size of 1.18mm, 2.9 parts of 42.5 sulphoaluminate cement, 26.1 parts of 42.5 common portland cement, 1.33 parts of gypsum, 3.98 parts of S95-grade mineral powder, 8.85 parts of F-class II-grade fly ash, 1.33 parts of silica micropowder (the content of silica is more than or equal to 99 percent and the particle size is 1200 meshes), 0.35 part of polycarboxylic acid high-performance water reducing agent (Xika, type 540P and white powder), 0.03 part of expanding agent (Xika, the apparent density is 300-600 g/L and yellow crystal powder), 0.02 part of defoaming agent (Xika, type DF770DD and white powder), 0.04 part of sodium citrate and 0.06 part of glass fiber (the diameter is 60 mu m and the length is 1.2 mm).
(2) The raw materials are uniformly mixed, and stirred in a mortar stirrer according to the proportion of 1 part by weight of grouting material dry powder and 0.11 part by weight of water, the stirring is carried out for 5min at the rotating speed of 140rpm, and then the stirring is carried out for 3min at the rotating speed of 285rpm, so as to obtain the grouting material.
Comparative example 1
The grouting material is prepared from the following raw materials in parts by weight:
the preparation method of the grouting material of the comparative example is the same as that of example 1.
Comparative example 2
The grouting material is prepared from the following raw materials in parts by weight:
the preparation method of the grouting material of the comparative example is the same as that of example 1.
Experimental example 1
The grouting materials prepared in the above examples and comparative examples were subjected to performance index detection, and the obtained performance index detection results are shown in table 1.
TABLE 1 grouting material Performance test results
As can be seen from the table above, the grouting material of the embodiment of the invention has good initial fluidity and is not easy to block during grouting; the compressive strength of the examples, especially 28d, is much higher than the standard; the vertical expansion rate of the embodiment is good, which shows that the embodiment has the advantage of good crack resistance. The 30min fluidity of the comparative example 1 is small, the standard requirement cannot be met, and the later strength (28d strength) is reversed; the early strength (1d strength and 3d strength) of comparative example 2 was low and did not meet the standard requirements.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The reinforced fiber anti-crack reinforcing steel bar sleeve grouting material is characterized by comprising the following raw materials in parts by weight:
the cement is the combination of sulphoaluminate cement and portland cement, wherein the sulphoaluminate cement accounts for 10-30% by mass of the cement, and the portland cement accounts for 70-90% by mass of the cement.
2. The reinforced fiber anti-cracking reinforced sleeve grouting material of claim 1, wherein the sand is selected from the group consisting of: artificial and/or river sand; the particle size of the sand is less than or equal to 1.18mm, the sand is in continuous gradation, and the mud content of the sand is less than or equal to 1%.
3. The reinforced fiber anti-cracking reinforced steel sleeve grouting material of claim 1, wherein the sulphoaluminate cement is 42.5 in grade strength, and the portland cement is 42.5 in grade strength.
4. The reinforced fiber anti-crack reinforcing steel bar sleeve grouting material as claimed in claim 1, wherein the slag powder is S95-grade mineral powder, and the specific surface area of the slag powder is not less than 4500cm2/g。
5. The reinforced fiber anti-crack reinforcing steel bar sleeve grouting material as claimed in claim 1, wherein the fly ash is class F class II fly ash;
the content of silicon dioxide in the silicon micro powder is more than or equal to 99%, and the particle size of the silicon micro powder is 800-1200 meshes.
6. The reinforced fiber anti-cracking reinforcing steel bar sleeve grouting material as claimed in claim 1, wherein the water reducing agent is a powdery polycarboxylic acid high-performance water reducing agent, and the water reducing rate of the water reducing agent is not less than 35%.
7. The reinforced fiber anti-crack reinforcing steel bar sleeve grouting material as claimed in claim 1, wherein the defoaming agent is a powdery organic silicon defoaming agent, and the silicon content in the defoaming agent is more than or equal to 99.5%;
the retarder is sodium citrate;
the swelling agent is selected from: calcium sulphoaluminate swelling agent and/or calcium oxide swelling agent.
8. The reinforced fiber anti-crack reinforced sleeve grouting material as claimed in any one of claims 1 to 7, wherein the reinforced fiber is selected from the group consisting of: one or more than two of polyethylene fiber, glass fiber and polypropylene fiber; the diameter of the reinforced fiber is less than or equal to 80 mu m, and the length of the reinforced fiber is 0.8-1.2 mm.
9. The preparation method of the reinforced fiber anti-crack reinforced sleeve grouting material as claimed in any one of claims 1 to 8, characterized by comprising the following steps: weighing the raw materials, adding water and mixing uniformly to obtain the reinforced fiber anti-crack reinforcing steel bar sleeve grouting material.
10. The method of claim 9, comprising the steps of:
s1, weighing the raw materials in parts by weight, and mixing to obtain grouting material dry powder;
s2, adding water into the dry grouting material powder, wherein the water adding amount is 11% -14% of the weight of the dry grouting material powder, and stirring at a low speed of 140 +/-5 rpm for 4-6 min and at a high speed of 285 +/-10 rpm for 2-4 min by adopting a standard JC/T681 planetary cement mortar stirrer to obtain the reinforced fiber anti-crack reinforcing steel bar sleeve grouting material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010806644.5A CN111908882A (en) | 2020-08-12 | 2020-08-12 | Reinforcing fiber anti-crack reinforcing steel bar sleeve grouting material and preparation method thereof |
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| CN202010806644.5A CN111908882A (en) | 2020-08-12 | 2020-08-12 | Reinforcing fiber anti-crack reinforcing steel bar sleeve grouting material and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113105198A (en) * | 2021-04-16 | 2021-07-13 | 交通运输部公路科学研究所 | Plate bottom grouting material for assembled cement concrete pavement plate |
| CN115490496A (en) * | 2022-10-24 | 2022-12-20 | 中建八局第三建设有限公司 | High-strength grouting material and preparation method and application thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0522384A1 (en) * | 1991-07-10 | 1993-01-13 | Paul Keller Ingenieurbüro Ag | Anchoring element |
| CN106699077A (en) * | 2016-12-19 | 2017-05-24 | 重庆市建筑科学研究院 | Sleeve grouting material for assembly type building steel bar connection |
| CN108530006A (en) * | 2018-05-30 | 2018-09-14 | 广州市建筑科学研究院有限公司 | A kind of fabricated construction connection reinforced bar sleeve grouting material and preparation method thereof |
| CN108947424A (en) * | 2018-08-30 | 2018-12-07 | 成都宏基建材股份有限公司 | A kind of fiber reinforcement reinforcing bar sleeve for connection grouting material and preparation method thereof |
-
2020
- 2020-08-12 CN CN202010806644.5A patent/CN111908882A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0522384A1 (en) * | 1991-07-10 | 1993-01-13 | Paul Keller Ingenieurbüro Ag | Anchoring element |
| CN106699077A (en) * | 2016-12-19 | 2017-05-24 | 重庆市建筑科学研究院 | Sleeve grouting material for assembly type building steel bar connection |
| CN108530006A (en) * | 2018-05-30 | 2018-09-14 | 广州市建筑科学研究院有限公司 | A kind of fabricated construction connection reinforced bar sleeve grouting material and preparation method thereof |
| CN108947424A (en) * | 2018-08-30 | 2018-12-07 | 成都宏基建材股份有限公司 | A kind of fiber reinforcement reinforcing bar sleeve for connection grouting material and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113105198A (en) * | 2021-04-16 | 2021-07-13 | 交通运输部公路科学研究所 | Plate bottom grouting material for assembled cement concrete pavement plate |
| CN115490496A (en) * | 2022-10-24 | 2022-12-20 | 中建八局第三建设有限公司 | High-strength grouting material and preparation method and application thereof |
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Application publication date: 20201110 |