CN112079607A - Proportioning and preparation method for improving frost resistance of sleeve grouting material for connecting steel bars - Google Patents
Proportioning and preparation method for improving frost resistance of sleeve grouting material for connecting steel bars Download PDFInfo
- Publication number
- CN112079607A CN112079607A CN202011002824.4A CN202011002824A CN112079607A CN 112079607 A CN112079607 A CN 112079607A CN 202011002824 A CN202011002824 A CN 202011002824A CN 112079607 A CN112079607 A CN 112079607A
- Authority
- CN
- China
- Prior art keywords
- parts
- grouting material
- fine aggregate
- weight
- sleeve grouting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
-
- 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
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a proportion and a preparation method for improving the frost resistance of a sleeve grouting material for connecting steel bars, wherein the sleeve grouting material is prepared by mixing a cementing material, a fine aggregate and various functional additives, wherein the materials are 475-525 parts by weight of the cementing material, 500 parts by weight of the fine aggregate and 9.5-12 parts by weight of the functional additives. The raw materials adopted by the invention have low cost, are extremely easy to purchase in the market, and have stronger economic effect and market competitiveness. By utilizing the synergistic effect of various additives, the working performance and the mechanical property of the sleeve grouting material are improved, and the freezing resistance of the sleeve grouting material is also improved.
Description
Technical Field
The invention relates to the technical field of sleeve grouting materials, in particular to a proportion and a preparation method for improving frost resistance of a sleeve grouting material for reinforcing steel bar connection.
Background
The steel bar sleeve grouting connection is an important mode of steel bar connection among all components in the fabricated building, wherein the performance of the sleeve grouting material is the key of the steel bar sleeve connection technology, and the quality of the performance plays a crucial role in the safety, the durability and the like of the whole structure.
In order to facilitate the construction of the sleeve grouting material in cold regions, low-temperature sleeve grouting materials have been developed, wherein the grouting temperature can be lower than-5 ℃ in grouting construction and maintenance, but the use of the sleeve grouting materials is not popularized yet, the cost is high, and the normal-temperature sleeve grouting materials are still the mainstream choice. However, at present, both the normal-temperature sleeve grouting material and the low-temperature sleeve grouting material only consider the influence of the mixing ratio on the early working performance and the mechanical property of the sleeve grouting material, such as the compressive strength, the fluidity, the expansibility and the like. The problem that the sleeve grouting material is greatly influenced by temperature difference in later use needs to be solved.
Disclosure of Invention
Based on the defects of the prior art, the invention aims to provide the proportion and the preparation method for improving the frost resistance of the sleeve grouting material for connecting the steel bars, and mainly aims to solve the problem that the later-stage use frost resistance of the sleeve grouting material for the steel bars in the prior art is poor.
In order to achieve the purpose, the invention adopts the following technical measures: the proportion for improving the frost resistance of the sleeve grouting material for connecting the steel bars is formed by mixing a cementing material, fine aggregate and various functional additives. The materials comprise, by weight, 475-525 parts of a cementing material, 500 parts of a fine aggregate and 9.5-12 parts of a functional additive.
Further, the cementing material comprises the following components in parts by weight: 410-435 parts of cement, 25 parts of fly ash, 25-40 parts of mineral powder and 15-25 parts of silica fume. Wherein the cement is portland cement, and the strength grade is 52.5. The density of the mineral powder is more than or equal to 2.8g/cm3(ii) a The density of the fly ash is more than or equal to 2.5g/cm3(ii) a The silica fume bulk density is between 0.55 and 0.65g/cm, and the particle size is less than 13 mu m.
Further, the fine aggregate is dried river sand, wherein the grading composition is that the ratio of the fine aggregate with the particle size of 0.075-1.18mm to the fine aggregate with the particle size of 1.18-2.36mm is 3:1, and the mud content is less than 2%.
Further, the functional additive is prepared from 4 parts of polycarboxylic acid water reducing agent, 1 part of organic silicon defoaming agent, 2 parts of UEA expanding agent and 2.5-5 parts of calcium formate according to parts by weight. Wherein the water reducing rate of the polycarboxylic acid water reducing agent is more than or equal to 24 percent, and the bulk density is more than or equal to 523 g/L; the active content of the defoaming agent is more than or equal to 60 percent, and the PH value is 7.0; the calcium formate content is more than or equal to 98 percent, and the shrinkage ratio is less than or equal to 135 percent.
Correspondingly, the preparation method for improving the frost resistance of the sleeve grouting material for connecting the steel bars comprises the following steps:
the method comprises the following steps: weighing various functional additives, and uniformly mixing;
step two: weighing the cementing material, adding the mixture obtained in the first step, and uniformly mixing;
step three: weighing fine aggregate, and uniformly mixing;
step four: weighing 140 parts by weight of mixing water (tap water) of the grouting material, adding the mixture obtained in the step two and the fine aggregate obtained in the step three into the mixing water while stirring, and uniformly stirring to obtain a grouting material test piece;
step four: after standard curing for 28 days, multiple freeze-thaw cycle tests are carried out on all test pieces by referring to a quick freezing method in GB/T50082-2009 test method standard for testing long-term performance and durability of common concrete. And observing the freeze-thaw deterioration degree of the test piece and recording relevant freezing resistance parameter indexes of the test piece, wherein the freezing resistance parameter indexes comprise the mass loss rate and the compressive strength.
Compared with the prior art, the technical scheme of the invention has the following obvious effects:
1. the grouting material of the invention consists of portland cement, river sand, fly ash, mineral powder, silica fume, a water reducing agent, a defoaming agent, an expanding agent and an early strength agent. The raw materials are low in cost, easy to obtain in the market, and high in economic effect and market competitiveness. By utilizing the synergistic effect of various additives, the working performance and the mechanical property of the sleeve grouting material are improved, and the freezing resistance of the sleeve grouting material is also improved.
2. The grouting material meets the requirements of the 'sleeve grouting material for connecting steel bars' JG/T4082013 standard, the initial fluidity is not less than 320cm, the initial fluidity is not less than 290cm after 30 mm, the 7d compressive strength is not less than 65MPa, and the 28d compressive strength is not less than 90 MPa. The vertical expansion rate of 3h is more than or equal to 0.02, and the difference between the vertical expansion rates of 24h and 3h is more than or equal to 0.02.
3. The grouting material has certain capacity of resisting freeze thawing damage in the later use stage.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the contents of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following detailed description is given in conjunction with the preferred embodiments.
Drawings
In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following briefly introduces the drawings of the embodiment:
FIG. 1 is a diagram showing the apparent state of a test piece after freeze-thawing in example 1 of the present invention;
FIG. 2 is a diagram showing the apparent state of a test piece after freeze-thawing in example 2 of the present invention;
FIG. 3 is a diagram showing the apparent state of the test piece after freeze-thaw action in example 3 of the present invention.
Detailed Description
Other aspects, features and advantages of the present invention will become apparent from the following detailed description, which, when taken in conjunction with the drawings, illustrate by way of example the principles of the invention.
Example 1:
a preparation method for improving the frost resistance of sleeve grouting material for connecting steel bars comprises the following steps:
the method comprises the following steps: weighing 12 parts of functional additive according to parts by weight, and uniformly mixing. The functional additive consists of 4 parts of polycarboxylic acid water reducing agent, 1 part of organic silicon defoaming agent, 2 parts of UEA expanding agent and 5 parts of calcium formate.
Step two: and weighing 500 parts of the cementing material according to the parts by weight, adding the mixture obtained in the step one, and uniformly mixing. Wherein the cementing material consists of 425 parts of portland cement, 25 parts of fly ash, 25 parts of mineral powder and 25 parts of silica fume.
Step three: weighing 500 parts of fine aggregate according to the parts by weight, and uniformly mixing. Wherein the ratio of the fine aggregate with the particle size of 0.075-1.18mm to the fine aggregate with the particle size of 1.18-2.36mm is 3: 1.
Step four: and weighing 140 parts of mixing water by weight of the grouting material, adding the mixture obtained in the second step and the fine aggregate obtained in the third step into the mixing water while stirring, and uniformly stirring to obtain a grouting material test piece.
Step five: and after standard maintenance for 28 days, performing freeze-thaw cycling test on the grouting material test piece by adopting a quick freezing method. And observing the freeze-thaw deterioration degree of the test piece and recording the relevant freezing resistance parameter indexes of the test piece.
Example 2:
a preparation method for improving the frost resistance of sleeve grouting material for connecting steel bars comprises the following steps:
the method comprises the following steps: weighing 12 parts of functional additive according to parts by weight, and uniformly mixing. The functional additive consists of 4 parts of polycarboxylic acid water reducing agent, 1 part of organic silicon defoaming agent, 2 parts of UEA expanding agent and 5 parts of calcium formate.
Step two: and (3) weighing 525 parts of the cementing material according to the parts by weight, adding the mixture obtained in the step one, and uniformly mixing. Wherein the cementing material consists of 435 parts of portland cement, 25 parts of fly ash, 40 parts of mineral powder and 25 parts of silica fume.
Step three: weighing 500 parts of fine aggregate according to the parts by weight, and uniformly mixing. Wherein the ratio of the fine aggregate with the particle size of 0.075-1.18mm to the fine aggregate with the particle size of 1.18-2.36mm is 3: 1.
Step four: and weighing 140 parts of mixing water by weight of the grouting material, adding the mixture obtained in the second step and the fine aggregate obtained in the third step into the mixing water while stirring, and uniformly stirring to obtain a grouting material test piece.
Step five: and after standard maintenance for 28 days, performing freeze-thaw cycling test on the grouting material test piece by adopting a quick freezing method. And observing the freeze-thaw deterioration degree of the test piece and recording the relevant freezing resistance parameter indexes of the test piece.
Example 3:
a preparation method for improving the frost resistance of sleeve grouting material for connecting steel bars comprises the following steps:
the method comprises the following steps: weighing 9.5 parts of functional additive according to parts by weight, and uniformly mixing. The functional additive consists of 4 parts of polycarboxylic acid water reducing agent, 1 part of organic silicon defoaming agent, 2 parts of UEA expanding agent and 2.5 parts of calcium formate.
Step two: and (3) weighing 475 parts of the cementing material according to the parts by weight, adding the mixture obtained in the step one, and uniformly mixing. Wherein the cementing material consists of 410 parts of portland cement, 25 parts of fly ash, 25 parts of mineral powder and 15 parts of silica fume.
Step three: weighing 500 parts of fine aggregate according to the parts by weight, and uniformly mixing. Wherein the ratio of the fine aggregate with the particle size of 0.075-1.18mm to the fine aggregate with the particle size of 1.18-2.36mm is 3: 1.
Step four: and weighing 140 parts of mixing water by weight of the grouting material, adding the mixture obtained in the second step and the fine aggregate obtained in the third step into the mixing water while stirring, and uniformly stirring to obtain a grouting material test piece.
Step five: and after standard maintenance for 28 days, performing freeze-thaw cycling test on the grouting material test piece by adopting a quick freezing method. And observing the freeze-thaw deterioration degree of the test piece and recording the relevant freezing resistance parameter indexes of the test piece.
Control group 1. In contrast to example 1, no defoamer was added.
The method comprises the following steps: weighing 11 parts of functional additive according to parts by weight, and uniformly mixing. The functional additive consists of 4 parts of polycarboxylic acid water reducing agent, 2 parts of UEA expanding agent and 5 parts of calcium formate.
Step two: and weighing 500 parts of the cementing material according to the parts by weight, adding the mixture obtained in the step one, and uniformly mixing. Wherein the cementing material consists of 425 parts of portland cement, 25 parts of fly ash, 25 parts of mineral powder and 25 parts of silica fume.
Step three: weighing 500 parts of fine aggregate according to the parts by weight, and uniformly mixing. Wherein the ratio of the fine aggregate with the particle size of 0.075-1.18mm to the fine aggregate with the particle size of 1.18-2.36mm is 3: 1.
Step four: and weighing 140 parts of mixing water by weight of the grouting material, adding the mixture obtained in the second step and the fine aggregate obtained in the third step into the mixing water while stirring, and uniformly stirring to obtain a grouting material test piece.
Step five: and after standard maintenance for 28 days, performing freeze-thaw cycling test on the grouting material test piece by adopting a quick freezing method. And observing the freeze-thaw deterioration degree of the test piece and recording the relevant freezing resistance parameter indexes of the test piece.
Control group 2. In contrast to example 2, no swelling agent was added.
The method comprises the following steps: weighing 10 parts of functional additive according to the parts by weight, and uniformly mixing. The functional additive is composed of 4 parts of polycarboxylic acid water reducing agent, 1 part of organic silicon defoaming agent and 5 parts of calcium formate.
Step two: and (3) weighing 525 parts of the cementing material according to the parts by weight, adding the mixture obtained in the step one, and uniformly mixing. Wherein the cementing material consists of 435 parts of portland cement, 25 parts of fly ash, 40 parts of mineral powder and 25 parts of silica fume.
Step three: weighing 500 parts of fine aggregate according to the parts by weight, and uniformly mixing. Wherein the ratio of the fine aggregate with the particle size of 0.075-1.18mm to the fine aggregate with the particle size of 1.18-2.36mm is 3: 1.
Step four: and weighing 140 parts of mixing water by weight of the grouting material, adding the mixture obtained in the second step and the fine aggregate obtained in the third step into the mixing water while stirring, and uniformly stirring to obtain a grouting material test piece.
Step five: and after standard maintenance for 28 days, performing freeze-thaw cycling test on the grouting material test piece by adopting a quick freezing method. And observing the freeze-thaw deterioration degree of the test piece and recording the relevant freezing resistance parameter indexes of the test piece.
Control group 3. In contrast to example 3, no early strength agent (calcium formate) was added.
The method comprises the following steps: weighing 7 parts of functional additive according to parts by weight, and uniformly mixing. The functional additive consists of 4 parts of polycarboxylic acid water reducing agent, 1 part of organic silicon defoaming agent and 2 parts of UEA expanding agent.
Step two: and (3) weighing 475 parts of the cementing material according to the parts by weight, adding the mixture obtained in the step one, and uniformly mixing. Wherein the cementing material consists of 410 parts of portland cement, 25 parts of fly ash, 25 parts of mineral powder and 15 parts of silica fume.
Step three: weighing 500 parts of fine aggregate according to the parts by weight, and uniformly mixing. Wherein the ratio of the fine aggregate with the particle size of 0.075-1.18mm to the fine aggregate with the particle size of 1.18-2.36mm is 3: 1.
Step four: and weighing 140 parts of mixing water by weight of the grouting material, adding the mixture obtained in the second step and the fine aggregate obtained in the third step into the mixing water while stirring, and uniformly stirring to obtain a grouting material test piece.
Step five: and after standard maintenance for 28 days, performing freeze-thaw cycling test on the grouting material test piece by adopting a quick freezing method.
And observing the freeze-thaw deterioration degree of the test piece and recording the relevant freezing resistance parameter indexes of the test piece.
According to the data in the table, various functional additives are compounded to form the antifreezing agent, and the antifreezing property of the applied grouting material can be improved without adding the antifreezing agent additionally.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. The proportion for improving the frost resistance of the sleeve grouting material for connecting the steel bars is characterized by being formed by mixing a cementing material, a fine aggregate and various functional additives, wherein the materials are 475-525 parts by weight of the cementing material, 500 parts by weight of the fine aggregate and 9.5-12 parts by weight of the functional additives.
2. The sleeve grouting material resistance for improving the connection of steel bars of claim 1The freezing property mixture ratio is characterized in that the cementing material comprises the following components in parts by weight: 410-435 parts of cement, 25 parts of fly ash, 25-40 parts of mineral powder and 15-25 parts of silica fume; wherein the cement is portland cement, and the strength grade is 52.5; the density of the mineral powder is more than or equal to 2.8g/cm3(ii) a The density of the fly ash is more than or equal to 2.5g/cm3(ii) a The silica fume bulk density is between 0.55 and 0.65g/cm, and the particle size is less than 13 mu m.
3. The proportion for improving the frost resistance of the sleeve grouting material for reinforcing steel bar connection according to claim 1, wherein the fine aggregate is dried river sand, wherein the proportion of the fine aggregate with the grain diameter of 0.075-1.18mm to the fine aggregate with the grain diameter of 1.18-2.36mm is 3:1, and the mud content is less than 2%.
4. The proportion for improving the frost resistance of the sleeve grouting material for reinforcing steel bar connection according to claim 1, wherein the functional additive is prepared from 4 parts of polycarboxylic acid water reducing agent, 1 part of organic silicon defoaming agent, 2 parts of UEA expanding agent and 2.5-5 parts of calcium formate according to parts by weight; the water reducing rate of the polycarboxylic acid water reducing agent is more than or equal to 24 percent, and the bulk density is more than or equal to 523 g/L; the active content of the defoaming agent is more than or equal to 60 percent, and the PH value is 7.0; the calcium formate content is more than or equal to 98 percent, and the shrinkage ratio is less than or equal to 135 percent.
5. The preparation method of the proportion for improving the frost resistance of the sleeve grouting material for reinforcing steel bar connection according to any one of claims 1 to 4, is characterized by comprising the following steps of:
the method comprises the following steps: weighing various functional additives, and uniformly mixing;
step two: weighing the cementing material, adding the mixture obtained in the first step, and uniformly mixing;
step three: weighing fine aggregate, and uniformly mixing;
step four: weighing 140 parts of mixing water by weight of grouting material, adding the mixture obtained in the second step and the fine aggregate obtained in the third step into the mixing water while stirring, and uniformly stirring to obtain a grouting material test piece;
step four: and after standard maintenance for 28d, performing multiple freeze-thaw cycle tests on all test pieces by using a quick freezing method, observing the freeze-thaw deterioration degree of the test pieces, and recording the relevant freezing resistance parameter indexes of the test pieces.
6. The preparation method of the proportion for improving the frost resistance of the sleeve grouting material for reinforcing steel bar connection according to claim 5, wherein the frost resistance parameter indexes comprise mass loss rate and compressive strength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011002824.4A CN112079607A (en) | 2020-09-22 | 2020-09-22 | Proportioning and preparation method for improving frost resistance of sleeve grouting material for connecting steel bars |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011002824.4A CN112079607A (en) | 2020-09-22 | 2020-09-22 | Proportioning and preparation method for improving frost resistance of sleeve grouting material for connecting steel bars |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112079607A true CN112079607A (en) | 2020-12-15 |
Family
ID=73739622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011002824.4A Pending CN112079607A (en) | 2020-09-22 | 2020-09-22 | Proportioning and preparation method for improving frost resistance of sleeve grouting material for connecting steel bars |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112079607A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007106664A (en) * | 2005-09-13 | 2007-04-26 | Ube Ind Ltd | Hydraulic composition |
| CN107572978A (en) * | 2017-09-27 | 2018-01-12 | 中建材中岩科技有限公司 | Bar connecting sleeve grouting material and preparation method thereof |
| CN107935496A (en) * | 2017-11-17 | 2018-04-20 | 芜湖铁路桥梁制造有限公司 | It is a kind of using cement as bridge pad mortar basic material of bottom material and preparation method thereof |
| CN108314393A (en) * | 2018-03-20 | 2018-07-24 | 中冶建筑研究总院有限公司 | A kind of low temperature environment bar connecting grouting material and its preparation method and application |
| CN111018455A (en) * | 2019-12-19 | 2020-04-17 | 上海城建建设实业集团新型建筑材料嘉兴有限公司 | Low-temperature type reinforcing steel bar connecting sleeve grouting material and preparation method thereof |
-
2020
- 2020-09-22 CN CN202011002824.4A patent/CN112079607A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007106664A (en) * | 2005-09-13 | 2007-04-26 | Ube Ind Ltd | Hydraulic composition |
| CN107572978A (en) * | 2017-09-27 | 2018-01-12 | 中建材中岩科技有限公司 | Bar connecting sleeve grouting material and preparation method thereof |
| CN107935496A (en) * | 2017-11-17 | 2018-04-20 | 芜湖铁路桥梁制造有限公司 | It is a kind of using cement as bridge pad mortar basic material of bottom material and preparation method thereof |
| CN108314393A (en) * | 2018-03-20 | 2018-07-24 | 中冶建筑研究总院有限公司 | A kind of low temperature environment bar connecting grouting material and its preparation method and application |
| CN111018455A (en) * | 2019-12-19 | 2020-04-17 | 上海城建建设实业集团新型建筑材料嘉兴有限公司 | Low-temperature type reinforcing steel bar connecting sleeve grouting material and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109369097B (en) | Low-shrinkage low-creep anti-cracking high-performance mass concrete | |
| CN111533517B (en) | Rapid repair mortar for high-speed railway concrete track slab and preparation method thereof | |
| CN109354463B (en) | Anti-seepage and anti-freezing C30 concrete and preparation method thereof | |
| CN109293301B (en) | Anti-freezing concrete | |
| CN107686315B (en) | Anti-freezing mass concrete | |
| CN110372304B (en) | Non-autoclaved PHC tubular pile concrete | |
| CN107572941B (en) | Grouting material special for micro-expansion assembly type construction steel bar connecting sleeve and preparation method thereof | |
| CN101186462A (en) | Liquid, chlorine-free, early-strength anti-freezing polycarboxylate composite water reducing agent and preparation method thereof | |
| CN111662053A (en) | Polypropylene fiber concrete and preparation method thereof | |
| CN113979712A (en) | High-performance concrete with low shrinkage | |
| CN104961418A (en) | Post-tensioning prestress hole channel slurry pressing material suitable for low temperature environment and preparing method thereof | |
| CN100453488C (en) | Silicate cement | |
| CN113526940A (en) | Anti-freezing inorganic quick-setting grouting material and preparation method thereof | |
| KR100908675B1 (en) | Concrete composition for revealing high early strength | |
| CN110451840B (en) | Composite type compacting agent | |
| JP6968637B2 (en) | How to make concrete | |
| CN112079607A (en) | Proportioning and preparation method for improving frost resistance of sleeve grouting material for connecting steel bars | |
| CN110590282A (en) | High-strength freeze-thaw-preventing concrete | |
| CN115974493A (en) | Anti-freezing and anti-cracking high-performance concrete and preparation method thereof | |
| CN112142405B (en) | C80 strength grade high-performance concrete and preparation method thereof | |
| CN111205011A (en) | Antifreezing agent for pavement concrete | |
| CN110655343A (en) | Modified concrete | |
| CN113264740B (en) | Corrosion-resistant concrete for multi-story and high-rise farms and preparation method thereof | |
| CN114394797B (en) | Coral reef sand foundation grouting reinforcement material and preparation method thereof | |
| CN114656208B (en) | Recycled concrete capable of being recycled in severe cold areas and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201215 |
|
| RJ01 | Rejection of invention patent application after publication |