CN109455987B - Normal-temperature curing ultrahigh-performance concrete column and construction method thereof - Google Patents
Normal-temperature curing ultrahigh-performance concrete column and construction method thereof Download PDFInfo
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- CN109455987B CN109455987B CN201811479778.XA CN201811479778A CN109455987B CN 109455987 B CN109455987 B CN 109455987B CN 201811479778 A CN201811479778 A CN 201811479778A CN 109455987 B CN109455987 B CN 109455987B
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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
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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
- E04G21/24—Safety or protective measures preventing damage to building parts or finishing work during construction
- E04G21/246—Safety or protective measures preventing damage to building parts or finishing work during construction specially adapted for curing concrete in situ, e.g. by covering it with protective sheets
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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 discloses a normal-temperature curing ultrahigh-performance concrete column and a construction method thereof, which have good technical feasibility and are convenient and fast to construct, and the concrete can be cured under a normal-temperature environment to obtain the ultrahigh-performance concrete, so that the bearing capacity of the reinforced concrete column is greatly improved, the field construction quality is ensured, and the construction efficiency is improved. And the invention does not need to use steam-pressing equipment, saves the construction cost and is beneficial to popularization in practical engineering.
Description
Technical Field
The invention relates to a normal-temperature curing ultrahigh-performance concrete column and a construction method thereof.
Background
The reinforced concrete structure is the most common structural form in high-rise buildings in our country. In recent years, super high-rise buildings are rapidly developed in China. The reinforced concrete column in the super high-rise structure bears huge axial force and bending moment, but the strength of the concrete adopted in the engineering at present is generally lower (not more than C80), so that the section size of the reinforced concrete column is huge, the self weight of the structure is increased, and the effective use space of the building is reduced. The compressive strength of the ultra-high performance concrete can reach more than 150MPa, and the application of the ultra-high performance concrete to a super high-rise structure can obviously reduce the section size of a column, increase the effective use area of a building and generate good economic benefit. However, the ultra-high performance concrete usually needs steam curing, has strict requirements on curing conditions, needs special steam-pressing equipment for curing in operation, is difficult to apply to actual engineering, and cannot be implemented on site.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a normal-temperature curing ultra-high-performance concrete column and a construction method thereof, and solves the problems in the background art.
The technical scheme adopted by the invention for solving the technical problems is as follows: the normal-temperature curing ultrahigh-performance concrete column is prepared by mixing and stirring water, cement, silica fume, quartz powder, a polycarboxylic acid type high-efficiency water reducing agent, quartz sand and sodium polyacrylate according to the mass ratio of 0.2:1:0.15:0.2:0.009:1.75: 0.03.
The invention also provides a construction method for the normal-temperature curing of the ultrahigh-performance concrete column, which comprises the following steps:
1) splicing the four wood templates two by two to form a hollow cuboid wood mold, vertically placing the wood mold, and then placing bundled longitudinal steel bars and high-strength stirrups into the wood mold, wherein the longitudinal steel bars are inserted into the wood mold along the length direction of the wood mold, and the high-strength stirrups are parallel to the cross section of the wood mold;
2) mixing water, cement, silica fume, quartz powder, a polycarboxylic acid type high-efficiency water reducing agent, quartz sand and sodium polyacrylate according to the mass ratio of 0.2:1:0.15:0.2:0.009:1.75:0.03, putting into a concrete mixer, and stirring for 15-20 minutes to obtain finished concrete;
3) pouring the finished concrete into a wood mold in a sectional vibrating manner;
4) maintaining the temperature of finished concrete in the wood mold at 70-90 ℃, uniformly covering a layer of high-foaming polyethylene outside the wood mold to serve as a heat insulation layer, bonding the high-foaming polyethylene heat insulation layer and the wood mold together by using glue, tightly attaching bonding surfaces of the high-foaming polyethylene heat insulation layer and the wood mold, and bonding and sealing a joint by using the glue;
4) and after curing for 7 days, cutting the high-foaming polyethylene heat-insulating layer along the bonding surface, and removing the wood template and the high-foaming polyethylene heat-insulating layer on the periphery of the wood template to obtain the ultra-high performance concrete with the strength of more than 150 MPa.
In a preferred embodiment of the present invention, in the step 3), each time one third of the height of the wooden formwork is poured, the wooden formwork is vibrated for 1 to 2 minutes until all the pouring is completed.
In a preferred embodiment of the present invention, the high-strength stirrups are bundled into a square shape, and the longitudinal steel bars are located inside four corners surrounded by the high-strength stirrups.
In a preferred embodiment of the present invention, the high-strength stirrups are bundled into a grid shape, and include a square outer frame and a # -shaped inner frame, and the longitudinal steel bars are located inside the intersection of the # -shaped inner frame and the square outer frame.
In a preferred embodiment of the present invention, the step 1) further comprises inserting the section steel into the wood mold along a length direction of the wood mold. The section steel is H-shaped steel. The section steel is positioned in the center surrounded by the high-strength stirrup and the longitudinal steel bar.
In a preferred embodiment of the invention, the insulation is bonded under slight compression during the sealing process.
In a preferred embodiment of the present invention, the insulating layer of high foaming polyethylene is cut along the bonding surface by a hand saw.
Compared with the background technology, the technical scheme has the following advantages:
1. the concrete of the invention has unique proportioning, so that the sodium polyacrylate can absorb 15-30 times of water by weight of the sodium polyacrylate in the concrete stirring process, and sufficient hydration water is provided for the concrete in the early stage of maintenance. The high-foaming polyethylene heat-insulating material creates a high-temperature environment required for accelerating early-stage cement hydration, can prevent the dissipation of cement hydration heat, and keeps the temperature in the wood mold at 70-90 ℃. The high-temperature environment created by the high-foaming polyethylene heat-insulating material and the hydration water provided by the sodium polyacrylate enable the concrete to be in the high-temperature and high-humidity environment, so that the ultra-high performance concrete with the strength exceeding 150MPa is formed.
2. The invention does not need complex maintenance procedures and maintenance devices, has good technical feasibility and convenient construction, and can maintain the concrete in the normal temperature environment to obtain the ultra-high performance concrete, thereby greatly improving the bearing capacity of the steel bar/section steel concrete column, ensuring the field construction quality and improving the construction efficiency. And the steam pressure equipment is not needed, so that the construction cost is saved, and the popularization in the actual engineering is facilitated.
Drawings
FIG. 1 is a transverse sectional view of example 2.
Fig. 2 is a schematic structural diagram of embodiment 2.
FIG. 3 is a transverse sectional view of example 3.
FIG. 4 is a schematic structural diagram of embodiment 3.
Detailed Description
The invention is explained in detail below with reference to the drawings and examples:
example 1
The concrete column 1 of the normal-temperature curing ultrahigh-performance concrete column is prepared by mixing and stirring water, cement, silica fume, quartz powder, a polycarboxylic acid type high-efficiency water reducing agent, quartz sand and sodium polyacrylate according to a mass ratio of 0.2:1:0.15:0.2:0.009:1.75: 0.03. The sodium polyacrylate added in the components can absorb 15-30 times of water of the weight of the sodium polyacrylate in the concrete stirring process, and sufficient hydration water is provided for the concrete in the early stage of maintenance. The polycarboxylic acid high-performance water reducing agent is purchased in the market, can prevent concrete slump loss without causing obvious delayed coagulation, exerts a higher plasticizing effect, has a remarkable concrete reinforcing effect, can reduce concrete shrinkage, and endows concrete with excellent construction workability. The concrete column 1 is ultra-high performance concrete with the strength exceeding 150 MPa.
Example 2
Referring to fig. 1-2, the construction method for curing an ultra-high performance concrete column at normal temperature according to the embodiment is used for curing construction of the concrete column according to the embodiment 1, and includes the following steps:
1) the four wood templates are spliced two by two to form a hollow cuboid wood mold 2. After the wood mold is vertically placed, the bundled longitudinal steel bars 5 and the high-strength stirrups 4 are placed into the wood mold 2, the longitudinal steel bars 5 are inserted into the wood mold 2 along the length direction of the wood mold 2, and the high-strength stirrups 4 are arranged at intervals in the direction parallel to the cross section of the wood mold 2; the high-strength stirrups 4 are bound into a square shape, and the longitudinal steel bars 5 are located at the inner sides of four corners formed by the high-strength stirrups 4 in an enclosed mode.
2) Mixing water, cement, silica fume, quartz powder, a polycarboxylic acid type high-efficiency water reducing agent, quartz sand and sodium polyacrylate according to the mass ratio of 0.2:1:0.15:0.2:0.009:1.75:0.03, putting into a concrete mixer, and stirring for 15-20 minutes to obtain finished concrete;
3) pouring the finished concrete into the wood mold 2 in a sectional vibrating manner, and vibrating for 1-2 minutes when the height of the wood mold 2 is one third till all pouring is finished;
4) maintaining the temperature of finished concrete in the wood mold 2 at 70-90 ℃, uniformly covering a layer of high-foaming polyethylene outside the wood mold 2 to be used as a heat insulation layer 3, bonding the high-foaming polyethylene heat insulation layer 3 and the wood mold 2 together by using glue, tightly attaching bonding surfaces of the high-foaming polyethylene heat insulation layer 3 and the wood mold 2, and bonding and sealing a joint by using the glue; when the heat-insulating layer 3 is bonded and sealed, the heat-insulating layer is bonded under slight extrusion;
4) and after curing for 7 days, cutting the high-foaming polyethylene heat-insulating layer 3 along the bonding surface by using a manual saw, and removing the wood mould 2 and the high-foaming polyethylene heat-insulating layer 3 on the periphery of the wood mould to obtain the ultra-high performance concrete with the strength of more than 150 MPa.
In this embodiment, for guaranteeing to stabilize, the cross section of wood mould is square, the stirrup 4 that excels in further ties up into nine palaces check shape, including square outline and groined type inner frame, longitudinal reinforcement 5 is located the inboard of groined type inner frame and square outline junction.
Example 3
This example differs from example 2 in that: the step 1) further comprises the step of inserting the section steel into the wood mould 2 along the length direction of the wood mould 2, wherein the section steel is H-shaped steel, and the H-shaped steel 6 is located in the center position surrounded by the high-strength stirrups 4 and the longitudinal steel bars 5. The length of the H-shaped steel 6 and the length of the longitudinal steel bar 5 are the same as that of the wood mould 2. Please refer to fig. 3-4, the periphery of the H-shaped steel 6 of the present embodiment is coated with concrete, longitudinal steel bars 5 are inserted between the concrete, and the periphery of the longitudinal steel bars 5 is provided with high-strength stirrups 4, so that the bearing capacity of the concrete column 1 is effectively ensured, and the on-site construction quality is ensured.
The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims and their equivalents.
Claims (10)
1. The utility model provides a normal atmospheric temperature maintenance ultra high performance concrete column which characterized in that: the concrete column is prepared by mixing and stirring water, cement, silica fume, quartz powder, a polycarboxylic acid type high-efficiency water reducing agent, quartz sand and sodium polyacrylate according to the mass ratio of 0.2:1:0.15:0.2:0.009:1.75: 0.03.
2. A construction method for normal temperature curing of an ultra-high performance concrete column is characterized by comprising the following steps:
1) splicing the four wood templates two by two to form a hollow cuboid wood mold, vertically placing the wood mold, and placing bundled longitudinal steel bars and high-strength stirrups into the wood mold, wherein the longitudinal steel bars are inserted into the wood mold along the length direction of the wood mold, and the high-strength stirrups are parallel to the cross section of the wood mold;
2) mixing water, cement, silica fume, quartz powder, a polycarboxylic acid type high-efficiency water reducing agent, quartz sand and sodium polyacrylate according to the mass ratio of 0.2:1:0.15:0.2:0.009:1.75:0.03, putting into a concrete mixer, and stirring for 15-20 minutes to obtain finished concrete;
3) pouring the finished concrete into a wood mold in a sectional vibrating manner;
4) maintaining the temperature of finished concrete in the wood mold at 70-90 ℃, uniformly covering a layer of high-foaming polyethylene outside the wood mold to serve as a heat insulation layer, bonding the high-foaming polyethylene heat insulation layer and the wood mold together by using glue, tightly attaching bonding surfaces of the high-foaming polyethylene heat insulation layer and the wood mold, and bonding and sealing a joint by using the glue;
4) and after curing for 7 days, cutting the high-foaming polyethylene heat-insulating layer along the bonding surface, and removing the wood template and the high-foaming polyethylene heat-insulating layer on the periphery of the wood template to obtain the ultra-high performance concrete with the strength of more than 150 MPa.
3. The construction method of the normal temperature curing ultra-high performance concrete column according to claim 2, characterized in that: and 3) vibrating for 1-2 minutes when the height of each third of the wooden template is poured until all pouring is finished.
4. The construction method of the normal temperature curing ultra-high performance concrete column according to claim 2, characterized in that: the high-strength stirrups are tied into a square shape, and the longitudinal steel bars are located on the inner sides of four corners formed by the high-strength stirrups in an enclosing mode.
5. The construction method of the normal temperature curing ultra-high performance concrete column as claimed in claim 4, characterized in that: the high-strength stirrup is tied up to be nine palace check shape, and comprises a square outer frame and a groined inner frame, and the longitudinal steel bar is positioned on the inner side of the intersection of the groined inner frame and the square outer frame.
6. The construction method of an ultra-high performance concrete column for normal temperature curing according to claim 2 or 4, characterized in that: the step 1) also comprises the step of inserting the section steel into the wood mould along the length direction of the wood mould.
7. The construction method of the normal temperature curing ultra-high performance concrete column as claimed in claim 6, characterized in that: the section steel is H-shaped steel.
8. The construction method of the normal temperature curing ultra-high performance concrete column as claimed in claim 6, characterized in that: the section steel is positioned in the center surrounded by the high-strength stirrup and the longitudinal steel bar.
9. The construction method of the normal temperature curing ultra-high performance concrete column according to claim 2, characterized in that: when the heat-insulating layer is bonded and sealed, the heat-insulating layer is bonded under slight extrusion.
10. The construction method of the normal temperature curing ultra-high performance concrete column according to claim 2, characterized in that: and cutting the high-foaming polyethylene heat-insulating layer along the bonding surface by using a manual saw.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205348794U (en) * | 2015-12-08 | 2016-06-29 | 中国建筑第八工程局有限公司 | Concrete structure's heat preservation maintenance system |
| CN108358523A (en) * | 2018-04-17 | 2018-08-03 | 上海复培新材料技术有限公司 | Concrete specific complex cementitious material and its application |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102359113A (en) * | 2011-07-20 | 2012-02-22 | 上海嘉洁环保工程有限公司 | Integrally-cast cement pervious concrete ecological protection slope and construction method thereof |
| CN102804993A (en) * | 2012-08-09 | 2012-12-05 | 江苏美尚生态景观股份有限公司 | Method of vagetaion matrix spray-seeding afforestation |
| FR3035399B1 (en) * | 2015-04-24 | 2019-08-09 | Kerneos | ADJUVANT FOR CEMENT OR REFRACTORY CONCRETE COMPOSITION, USES THEREOF, AND CEMENT AND REFRACTORY CONCRETE COMPOSITIONS |
| CN106242430B (en) * | 2016-08-09 | 2018-01-30 | 天津城建大学 | A kind of permeable, moisture retention concrete pavior brick preparation method |
| CN106365566A (en) * | 2016-08-30 | 2017-02-01 | 卓达新材料科技集团威海股份有限公司 | Aerogel composite sandstone plate and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205348794U (en) * | 2015-12-08 | 2016-06-29 | 中国建筑第八工程局有限公司 | Concrete structure's heat preservation maintenance system |
| CN108358523A (en) * | 2018-04-17 | 2018-08-03 | 上海复培新材料技术有限公司 | Concrete specific complex cementitious material and its application |
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