CN111763047B - Pouring paste slurry for prefabricated concrete structure steel bar connecting sleeve and preparation method and pouring method thereof - Google Patents
Pouring paste slurry for prefabricated concrete structure steel bar connecting sleeve and preparation method and pouring method thereof Download PDFInfo
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- CN111763047B CN111763047B CN202010581734.9A CN202010581734A CN111763047B CN 111763047 B CN111763047 B CN 111763047B CN 202010581734 A CN202010581734 A CN 202010581734A CN 111763047 B CN111763047 B CN 111763047B
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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
- C04B28/02—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
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Civil Engineering (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
A pouring paste slurry for a prefabricated concrete structure steel bar connecting sleeve and a preparation method and a pouring method thereof. The invention belongs to the field of civil engineering. The invention solves the technical problems of slurry leakage, unfirm connection and complex operation of the existing fabricated concrete member steel bar sleeve pouring connection, which cause construction difficulty. The product is as follows: the pouring paste slurry is prepared from cement, quartz sand, water, a thickening agent, silica fume, an expanding agent and a water reducing agent. The method comprises the following steps: sequentially adding quartz sand, cement, silica fume and an expanding agent into a stirrer, and uniformly stirring to obtain a mixed dry material; uniformly mixing water, a thickening agent and a water reducing agent to obtain a mixed liquid; and thirdly, adding the mixed liquid into the mixed dry materials in batches, and stirring to obtain the perfusion paste. The pouring paste disclosed by the invention has proper fluidity, good construction performance and good self-compaction property, can well complete pouring and firm connection functions, and has two excellent performances of high thixotropy and static and dynamic resistance.
Description
Technical Field
The invention belongs to the field of civil engineering, and particularly relates to a pouring paste for a prefabricated concrete structure steel bar connecting sleeve, and a preparation method and a pouring method thereof.
Background
In recent years, with the continuous development of economy, the continuous improvement of comprehensive national force and the continuous application of high and new technologies, the prefabricated concrete structure in China is rapidly developed unprecedentedly, and the market application prospect of the prefabricated concrete structure is wide. With the rapid development of the construction scale and speed of the fabricated concrete structure, the traditional filling material and the double-hole sleeve (upper exhaust and lower filling slurry) matched with the traditional filling material are the main bodies of the existing steel bar connection, the problems of strength, reliability and construction efficiency are obvious year by year, the existing problems mainly concentrate on the situation that the high-fluidity filling material leaks slurry, runs slurry and is unrealistic in connection when the high-fluidity filling material is used for filling connection, the filling operation is complex, great difficulty is brought to construction, the further development of the fabricated concrete structure is restrained to a great extent, and therefore the filling material which can fill the sleeve (with double holes) at one time and has two excellent performances of high thixotropy and static stability and dynamic resistance is urgently needed to be found.
Disclosure of Invention
The invention solves the technical problems of slurry leakage, unfinished connection and complex operation of the existing fabricated concrete member steel bar sleeve during pouring connection, and causes construction difficulty, and provides a pouring paste slurry for a fabricated concrete structure steel bar connecting sleeve, a preparation method and a pouring method thereof.
The invention relates to a pouring paste for a steel bar connecting sleeve of an assembled concrete structure, which is prepared from cement, quartz sand, water, a thickening agent, silica fume, an expanding agent and a water reducing agent; the mass ratio of the quartz sand to the cement is (110-130): 100, respectively; the mass ratio of the water to the cement is (25-30): 100, respectively; the mass ratio of the thickening agent to the cement is (0.2-0.4): 100, respectively; the mass ratio of the silica fume to the cement is (4-8): 100; the mass ratio of the expanding agent to the cement is (7-13): 100, respectively; the mass ratio of the water reducing agent to the cement is (0.5-1): 100.
further limiting, the pouring paste for the prefabricated concrete structure steel bar connecting sleeve is prepared from cement, quartz sand, water, a thickening agent, silica fume, an expanding agent and a water reducing agent; the mass ratio of the quartz sand to the cement is 125: 100, respectively; the mass ratio of the water to the cement is 29: 100, respectively; the mass ratio of the thickening agent to the cement is 0.25: 100; the mass ratio of the silica fume to the cement is 8: 100, respectively; the mass ratio of the expanding agent to the cement is 8: 100, respectively; the mass ratio of the water reducing agent to the cement is 0.6: 100.
further limiting, the fineness modulus of the quartz sand is 1.8-2.5.
Further defined, the fineness modulus of the quartz sand is 2.2.
The preparation method of the pouring paste slurry for the prefabricated concrete structure steel bar connecting sleeve is carried out according to the following steps:
firstly, sequentially adding quartz sand, cement, silica fume and an expanding agent into a stirrer, and uniformly stirring, wherein the stirring parameters are as follows: rotating at the speed of 20-30 rpm, the temperature of 18-24 ℃, and the time of 2-3 min to obtain a dry mixed material;
uniformly mixing water, a thickening agent and a water reducing agent to obtain a mixed liquid;
thirdly, adding part of the mixed liquid obtained in the second step into the mixed dry material obtained in the first step, and stirring for 2-3 min; and secondly, adding the mixed liquid obtained in the rest step two, and stirring for 2-3 min to obtain the high-performance perfusion paste for perfusion connection of the reinforcement sleeve of the prefabricated concrete structure.
Further limiting, the mixed liquid added in the third step is 50% of the mixed liquid obtained in the second step.
The invention relates to a pouring method of pouring grout for a prefabricated concrete structure steel bar connecting sleeve, which comprises the following steps:
and (3) continuously and uniformly filling the mixed wet grouting paste into the sleeve until the sleeve is filled with the wet grouting paste.
Further limited, the speed of the perfusion is 0.5kg/min to 1kg/min per minute.
Compared with the prior art, the invention has the following advantages:
(1) the pouring paste for pouring and connecting the assembled steel bar sleeve has proper fluidity, good construction performance and good self-compaction property, can well complete the pouring and firm connection functions, and has special static stability performance.
(2) The pouring paste for pouring connection of the assembled steel bar sleeve directly pours into the sleeve port, so that the construction cost is reduced.
(3) According to the pouring paste for pouring and connecting the assembled reinforcing steel bar sleeve, the silica fume is added to be used as a part of a paste material to replace part of cement, so that the fluidity and the later strength of the paste material can be improved, and the compactness and the durability of the paste material are improved.
Detailed Description
The first embodiment is as follows: the pouring paste slurry for the prefabricated concrete structure steel bar connecting sleeve is prepared from 100g of cement, 125g of quartz sand, 8g of silica fume, 8g of an expanding agent, 0.6g of a water reducing agent, 30g of water and 0.25g of a thickening agent.
The cement is swan P.O 42.5.5 ordinary portland cement.
In the embodiment, the silica fume is adopted to replace part of cement, so that the flow characteristic, the later strength and the compactness of the paste are improved.
According to the embodiment, the quartz sand with the fineness modulus of 2.2 is used as the fine aggregate of the paste, so that the water consumption for pouring the paste is improved, and the stationarity of the paste is improved.
The thickening agent adopts hydroxypropyl methyl cellulose ether, the expanding agent adopts calcium sulphoaluminate, the water reducing agent adopts polycarboxylic acid, and the water adopts tap water.
The method for preparing the pouring paste for assembling the steel bar sleeve comprises the following steps:
firstly, sequentially adding quartz sand, cement, silica fume and an expanding agent into a stirrer, and uniformly stirring, wherein the stirring parameters are as follows: rotating at 25rpm at 20 deg.C for 3min to obtain dry mixture;
uniformly mixing water, a thickening agent and a water reducing agent to obtain a mixed liquid;
thirdly, adding half of the mixed liquid obtained in the second step into the mixed dry material obtained in the first step, and stirring for 3 min; and secondly, adding the remaining half of the mixed liquid obtained in the second step, and stirring for 3min to obtain the high-performance perfusion paste for perfusion connection of the reinforcement sleeve of the prefabricated concrete structure.
The method for pouring the sleeve by using the pouring paste slurry for the prefabricated concrete structure steel bar connecting sleeve comprises the following steps of:
the mixed wet grouting paste is continuously and constantly poured into the sleeve at a constant speed of 1kg/min until the sleeve is filled.
Verification test
The following simulation test is adopted to verify the actual effect of the pouring paste for the pouring connection of the fabricated steel bar sleeve in the first embodiment, and the specific steps are as follows:
first, choose to
The method comprises the following steps of (1) sleeving a reinforcing steel bar, namely pouring mixed pouring paste for pouring connection of the reinforcing steel bar sleeving into the reinforcing steel bar sleeving at one time, and feeding materials in an uninterrupted constant-speed mode every time, wherein the feeding speed is 1 kg/min;
vertically inverting the sleeve mold and standing for 5-10 min, and observing the flow resistance and the stationarity of the surface layer of the pouring material; and the reinforcing steel bars are vertically inserted, excessive paste slurry on the surface of the die is wiped off, and the vertical high thixotropy and the static stability and the mobility of the test piece are observed, so that the test piece does not flow and has a good effect.
Thirdly, detecting the intensity: and (3) putting the mixed paste slurry for perfusion connection of the steel bar sleeve into a 70.7mm multiplied by 70.7mm mould at one time, and performing standard maintenance on the test piece until the age is 1d, 3d and 28 d.
Detecting the strength of the test piece: the strengths of 1d, 3d and 28d were 47.6MPa, 71MPa and 91.7MPa in this order.
Detecting the vertical expansion rate: the vertical expansion rate of 3h is more than or equal to 0.02 percent, and the difference between the vertical expansion rate of 24h and the vertical expansion rate of 3h is less than or equal to 0.03 percent.
Claims (2)
1. The pouring paste slurry for the steel bar connecting sleeve of the prefabricated concrete structure is characterized by being prepared from 100g of cement, 125g of quartz sand, 8g of silica fume, 8g of an expanding agent, 0.6g of a water reducing agent, 30g of water and 0.25g of a thickening agent, wherein the cement is swan P.O 42.5.5 common portland cement, the fineness modulus of the quartz sand is 2.2, the thickening agent is hydroxypropyl methyl cellulose ether, the expanding agent is calcium sulphoaluminate, the water reducing agent is polycarboxylic acid, and the water is tap water;
the preparation method of the perfusion paste slurry comprises the following steps:
firstly, sequentially adding quartz sand, cement, silica fume and an expanding agent into a stirrer, and uniformly stirring, wherein the stirring parameters are as follows: rotating at 25rpm at 20 deg.C for 3min to obtain dry mixture;
uniformly mixing water, a thickening agent and a water reducing agent to obtain a mixed liquid;
thirdly, adding half of the mixed liquid obtained in the second step into the mixed dry material obtained in the first step, and stirring for 3 min; and secondly, adding the remaining half of the mixed liquid obtained in the second step, and stirring for 3min to obtain the high-performance perfusion paste for perfusion connection of the reinforcement sleeve of the prefabricated concrete structure.
2. A method for pouring grout for a reinforcing bar connecting sleeve of a fabricated concrete structure according to claim 1, which is carried out by the steps of:
and continuously filling the mixed wet grouting paste into the sleeve at a constant speed until the sleeve is filled with the wet grouting paste, wherein the filling speed is 1kg/min per minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010581734.9A CN111763047B (en) | 2020-06-23 | 2020-06-23 | Pouring paste slurry for prefabricated concrete structure steel bar connecting sleeve and preparation method and pouring method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010581734.9A CN111763047B (en) | 2020-06-23 | 2020-06-23 | Pouring paste slurry for prefabricated concrete structure steel bar connecting sleeve and preparation method and pouring method thereof |
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| Publication Number | Publication Date |
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| CN111763047A CN111763047A (en) | 2020-10-13 |
| CN111763047B true CN111763047B (en) | 2022-05-06 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011014975A1 (en) * | 2011-03-24 | 2012-10-11 | Fels-Werke Gmbh | Containers and their use for the production of mineral hydrous fresh mortars |
| CN104402363A (en) * | 2014-09-16 | 2015-03-11 | 柳州欧维姆机械股份有限公司 | Sleeve grouting material for connection of steel bar and preparation method thereof |
| CN105693173A (en) * | 2016-02-03 | 2016-06-22 | 合肥工业大学 | Sleeve grouting material for prefabricated buildings |
| 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 |
-
2020
- 2020-06-23 CN CN202010581734.9A patent/CN111763047B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011014975A1 (en) * | 2011-03-24 | 2012-10-11 | Fels-Werke Gmbh | Containers and their use for the production of mineral hydrous fresh mortars |
| CN104402363A (en) * | 2014-09-16 | 2015-03-11 | 柳州欧维姆机械股份有限公司 | Sleeve grouting material for connection of steel bar and preparation method thereof |
| CN105693173A (en) * | 2016-02-03 | 2016-06-22 | 合肥工业大学 | Sleeve grouting material for prefabricated buildings |
| 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 |
| CN108947422A (en) * | 2016-12-19 | 2018-12-07 | 重庆市建筑科学研究院 | A kind of dry powder blend material suitable for the grouting of assembled architecture reinforcing bar sleeve for connection |
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| CN111763047A (en) | 2020-10-13 |
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