CN112502276A - Lightweight aggregate high-strength concrete structure and construction method - Google Patents
Lightweight aggregate high-strength concrete structure and construction method Download PDFInfo
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- CN112502276A CN112502276A CN202011242017.XA CN202011242017A CN112502276A CN 112502276 A CN112502276 A CN 112502276A CN 202011242017 A CN202011242017 A CN 202011242017A CN 112502276 A CN112502276 A CN 112502276A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/16—Structures made from masses, e.g. of concrete, cast or similarly formed in situ with or without making use of additional elements, such as permanent forms, substructures to be coated with load-bearing material
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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
- E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
- E04G11/02—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for rooms as a whole by which walls and floors are cast simultaneously, whole storeys, or whole buildings
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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
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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
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- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of constructional engineering, in particular to a light aggregate high-strength concrete structure and a construction forming method thereof, wherein the construction forming method of the light aggregate high-strength concrete comprises the following steps: the method comprises the steps of arranging templates in a pre-cast structure, pre-embedding a grouting pipe with holes, pouring light aggregate, covering the top surfaces of the surrounding templates with the templates, fixing the templates with the ground by using pull rods to prepare high-strength cement-based slurry, and injecting large-flow shrinkage-free high-strength cement-based slurry into the grouting pipe to form the casting structure. The lightweight aggregate concrete structure provided by the invention takes the lightweight aggregate as a main filler, and adopts high-strength cement-based slurry with good fluidity to fill gaps among the lightweight aggregate, so that the lightweight aggregate is not required to be pretreated, the strength of the lightweight aggregate concrete is high, the lightweight aggregate is uniformly distributed and does not float upwards, the construction is simple and convenient, and the like, thereby ensuring the construction quality, economy and safety of the lightweight aggregate concrete and having wide application prospect.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a light aggregate high-strength concrete structure and a construction method thereof.
Background
The lightweight aggregate concrete has the characteristics of light dead weight, good durability, good earthquake resistance and the like, can play the roles of reducing the self weight of the structure, improving the earthquake resistance of the structure, improving the transportation and hoisting efficiency of components, reducing foundation load and the like, has wide application prospect in the fields of high-rise or super high-rise buildings, large-span bridge structures, steel bridge pavement, enclosing structures and the like, but has the properties of light particle mass, low strength, easy water absorption and the like, so that the prepared lightweight aggregate concrete has the problems of low strength, poor workability, difficulty in pumping, floating of the lightweight aggregate and the like, and restricts the further application of the lightweight aggregate concrete.
Aiming at the problems of the light aggregate concrete, most solutions are to improve the concrete strength and improve the construction performance and aggregate floating through measures such as light aggregate pretreatment, cement dosage increase, silica fume doping and other high-activity admixtures, tackifiers and the like, but the measures can bring about the increase of measure cost and the increase of concrete shrinkage, and the problems of difficult pumping and aggregate floating can not be completely solved. Chinese patent 101077596A, a lightweight aggregate pretreatment method and device, solves the problems of aggregate water absorption and concrete pumping by pressurizing and prewetting the lightweight aggregate and making the shell, but the technology does not relate to the aspects of strength, aggregate floating and the like. Chinese patent 101172821A, preparation method of high-strength high-toughness lightweight aggregate concrete, proposes toughening treatment of lightweight aggregate to prepare high-strength high-toughness lightweight aggregate concrete, but the technology does not relate to the construction of lightweight aggregate concrete and the problem of aggregate floating.
The invention sets the template according to the structure of the precast, takes the light aggregate as the main filler, and adopts the high-strength cement-based slurry with good fluidity to fill the gap between the light aggregate, so that the light aggregate is free from pretreatment, the concrete strength of the light aggregate is high, the light aggregate is uniformly distributed without floating, the construction is simple and convenient, and the like, thereby ensuring the construction quality, economy and safety of the light aggregate concrete and having wide application prospect.
Disclosure of Invention
The invention aims to provide a light aggregate high-strength concrete structure and a construction method thereof. The method mainly comprises the steps that templates are arranged on the periphery of the structure, light aggregate is used as a main filler, the top surfaces of the templates on the periphery of the structure are sealed by the templates and are fixed by pull rods to form a structure, and therefore the problems of pumping and floating of the light aggregate are solved; the cement-based slurry material with high strength, high fluidity and no shrinkage is prepared and injected into the gap of the lightweight aggregate filler, so that the problem of the strength of the lightweight aggregate concrete is solved, and the construction quality, economy and safety of the lightweight aggregate high-strength concrete structure are ensured.
In order to achieve the purpose, the light aggregate high-strength concrete structure and the construction method provided by the invention are characterized in that templates are arranged around a pre-cast structure, light aggregates and pre-embedded grouting pipes are poured into the templates, the light aggregates are leveled, the top surfaces of the surrounding templates are sealed by the templates and fixed by pull rods, large-flow non-shrinkage high-strength cement-based slurry is injected into the grouting pipes in a pressing mode, and the casting structure is formed after the templates are removed.
Further, the lightweight aggregate high-strength concrete structure is formed by hardening lightweight aggregate fillers, grouting pipes and high-strength cement-based slurry.
Furthermore, the lightweight aggregate is one or a mixture of pumice, clay ceramsite, shale ceramsite, zeolite, coal gangue, fly ash ceramsite and the like, the cylinder pressure strength is more than or equal to 6.0MPa, and the maximum particle size is 30 mm.
Further, the template is one of steel, steel wood, wood and plastic composite templates.
Further, the grouting pipe is a plastic pipe or a metal pipe with holes, and the section of the pipe comprises a circle, a rectangle and a polygon.
Further, the pull rod is a single-head screw rod building template fastener.
Further, the high-strength cement-based slurry is composed of ordinary silicate cement, silica fume, superfine steel slag micropowder, a powdery polycarboxylic acid water reducer, a composite expanding agent and the like, the fluidity of the slurry is less than 15s, the bleeding rate is 0, the 3-day compressive strength is more than 50MPa, the 28-day compressive strength is more than 80MPa, and the 24-hour free expansion rate is 0-0.1%.
The invention also provides a construction method of the lightweight aggregate high-strength concrete structure, which comprises the following steps:
1) arranging templates around the template according to the designed structure size;
2) pouring lightweight aggregate and pre-buried grouting pipes into the template in the step 1, and leveling the lightweight aggregate particles;
3) sealing the top surfaces of the surrounding formworks in the step 1 by using formworks and fixing by using pull rods;
4) and (3) injecting the large-flow shrinkage-free high-strength cement-based slurry into the grouting pipe, and removing the mold to form a pouring structure.
Compared with the prior art, the invention has the following advantages:
firstly, the invention utilizes the templates arranged around the structure, uses the light aggregate as the main filler, and uses the templates with covers to seal the top surface of the structure and fix the top surface by the pull rods, thereby ensuring that the light aggregate does not float upwards during grouting, and solving the problems of floating and uneven distribution in the conventional light aggregate concrete construction.
Secondly, the lightweight aggregate is used as a main filler, the gaps among the lightweight aggregate are filled with high-strength cement-based slurry with high fluidity and no shrinkage, and the 28-day compressive strength of the cement-based slurry can be more than 80MPa, so that the overall structural strength is ensured to be more than 50 MPa.
Thirdly, the lightweight aggregate is directly poured into the template, the lightweight aggregate does not need to be pretreated, and when the large-flow shrinkage-free high-strength cement-based slurry is used for filling, vibration is not needed, so that the construction process is simplified, the construction progress is accelerated, the consumption of lightweight aggregate concrete is effectively reduced, and the construction cost is reduced.
Drawings
FIG. 1 is a schematic view of the high strength cement-based slurry pressure injection without shrinkage in large flow when the lightweight aggregate high strength concrete structure and the construction method of the invention are adopted.
1. Side formwork
2. Light aggregate
3. Grouting pipe
4. Top surface template
5. Pull rod
6. High-strength cement-based slurry
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The lightweight aggregate high-strength concrete structure and the construction method provided by the embodiment are as follows:
1) according to the size of a designed cuboid structure (10.0m multiplied by 4.0m multiplied by 2.0m), steel templates are arranged around the cuboid structure, and the templates are sealed with the ground by rubber strips to prevent slurry leakage;
2) pouring shale ceramisite with the particle size of 5-30 mm into the template, wherein the cylinder pressure strength of the shale ceramisite is 7.8MPa, and embedding 1 perforated steel grouting pipe with the diameter of 30mm and the length of 3m every 1 m;
3) the top surface of the structural template is sealed by a steel template, a single-head screw building template fastener is used for fixing the top steel template with the ground, and the top surface template and the surrounding templates are sealed by rubber strips to prevent slurry leakage;
4) preparing large-flow non-shrinkage high-strength cement paste, wherein the fluidity of the paste is less than 15s, the bleeding rate is 0, the 3-day compressive strength is more than 50MPa, the 28-day compressive strength is more than 80MPa, and the 24-hour free expansion rate is 0-0.1%;
5) and (3) performing pressure injection on the large-flow shrinkage-free high-strength cement-based slurry from the grouting pipe, keeping the pressure injection pressure at 0.3 +/-0.1 MPa, and forming a pouring structure after the mold is removed.
6) As can be seen from coring, the lightweight aggregate is uniformly distributed in the concrete, and the measured compressive strength of the lightweight aggregate high-strength concrete 28d is 61.7 MPa.
Example 2
The lightweight aggregate high-strength concrete structure and the construction method provided by the embodiment are as follows:
1) according to the size of a designed cuboid structure (10.0m multiplied by 4.0m multiplied by 2.0m), steel templates are arranged around the cuboid structure, and the templates are sealed with the ground by rubber strips to prevent slurry leakage;
2) pouring fly ash ceramsite with the particle size of 5-30 mm into the template, wherein the barrel pressure strength of the fly ash ceramsite is 6.5MPa, and embedding 1 perforated steel grouting pipe with the diameter of 30mm and the length of 3m every 1 m;
3) the top surface of the structural template is sealed by a steel template, a single-head screw building template fastener is used for fixing the top steel template with the ground, and the top surface template and the surrounding templates are sealed by rubber strips to prevent slurry leakage;
4) preparing large-flow non-shrinkage high-strength cement paste, wherein the fluidity of the paste is less than 15s, the bleeding rate is 0, the 3-day compressive strength is more than 50MPa, the 28-day compressive strength is more than 80MPa, and the 24-hour free expansion rate is 0-0.1%;
5) and (3) performing pressure injection on the large-flow shrinkage-free high-strength cement-based slurry from the grouting pipe, keeping the pressure injection pressure at 0.3 +/-0.1 MPa, and forming a pouring structure after the mold is removed.
6) As can be seen from coring, the lightweight aggregate is uniformly distributed in the concrete, and the measured compressive strength of the lightweight aggregate high-strength concrete 28d is 58.4 MPa.
Example 3
The lightweight aggregate high-strength concrete structure and the construction method provided by the embodiment are as follows:
1) according to the size of the designed cuboid structure (8.0m multiplied by 3.0m multiplied by 2.0m), steel templates are arranged around the cuboid structure, and the templates are sealed with the ground by rubber strips to prevent slurry leakage;
2) pouring shale ceramisite with the particle size of 5-25 mm into the template, wherein the cylinder pressure strength of the shale ceramisite is 7.8MPa, and pre-burying 1 perforated plastic grouting pipe with the diameter of 25mm and the length of 3m every 1 m;
3) the top surface of the structural template is sealed by a wood template, a single-head screw building template fastener is used for fixing the top steel mold with the ground, and the top template and the surrounding templates are sealed by rubber strips to prevent slurry leakage;
4) preparing large-flow non-shrinkage high-strength cement paste, wherein the fluidity of the paste is less than 15s, the bleeding rate is 0, the 3-day compressive strength is more than 50MPa, the 28-day compressive strength is more than 80MPa, and the 24-hour free expansion rate is 0-0.1%;
5) and (3) performing pressure injection on the large-flow shrinkage-free high-strength cement-based slurry from the grouting pipe, keeping the pressure injection pressure at 0.3 +/-0.1 MPa, and forming a pouring structure after the mold is removed.
6) As can be seen from coring, the lightweight aggregate is uniformly distributed in the concrete, and the measured compressive strength of the lightweight aggregate high-strength concrete 28d is 60.8 MPa.
Example 4
The lightweight aggregate high-strength concrete structure and the construction method provided by the embodiment are as follows:
1) according to the size of the designed cuboid structure (8.0m multiplied by 3.0m multiplied by 2.0m), steel templates are arranged around the cuboid structure, and the templates are sealed with the ground by rubber strips to prevent slurry leakage;
2) pouring fly ash ceramsite with the particle size of 5-25 mm into the template, wherein the barrel pressure strength of the fly ash ceramsite is 6.5MPa, and embedding 1 perforated plastic grouting pipe with the diameter of 25mm and the length of 3m every 1 m;
3) the top surface of the structural template is sealed by a wood template, a single-head screw building template fastener is used for fixing the top steel mold with the ground, and the top template and the surrounding templates are sealed by rubber strips to prevent slurry leakage;
4) preparing large-flow non-shrinkage high-strength cement paste, wherein the fluidity of the paste is less than 15s, the bleeding rate is 0, the 3-day compressive strength is more than 50MPa, the 28-day compressive strength is more than 80MPa, and the 24-hour free expansion rate is 0-0.1%;
5) and (3) performing pressure injection on the large-flow shrinkage-free high-strength cement-based slurry from the grouting pipe, keeping the pressure injection pressure at 0.3 +/-0.1 MPa, and forming a pouring structure after the mold is removed.
6) As can be seen from coring, the lightweight aggregate is uniformly distributed in the concrete, and the measured compressive strength of the lightweight aggregate high-strength concrete 28d is 54.7 MPa.
Example 5
The lightweight aggregate high-strength concrete structure and the construction method provided by the embodiment are as follows:
1) according to the size (15.0m multiplied by 5.0m multiplied by 2.0m) of the designed cuboid structure, steel templates are arranged around the cuboid structure, and the templates are sealed with the ground by rubber strips to prevent slurry leakage;
2) pouring a mixture of shale ceramsite and zeolite with the particle size of 5-25 mm into the template, wherein the cylinder pressure strength is 6.0MPa, and embedding 1 perforated rectangular steel grouting pipe with the side length of 50mm multiplied by 25mm and the height of 3m every 1 m;
3) the top surface of the structural template is sealed by a steel template, a single-head screw building template fastener is used for fixing the top steel template with the ground, and the top surface template and the surrounding templates are sealed by rubber strips to prevent slurry leakage;
4) preparing large-flow non-shrinkage high-strength cement paste, wherein the fluidity of the paste is less than 15s, the bleeding rate is 0, the 3-day compressive strength is more than 50MPa, the 28-day compressive strength is more than 80MPa, and the 24-hour free expansion rate is 0-0.1%;
5) and (3) performing pressure injection on the large-flow shrinkage-free high-strength cement-based slurry from the grouting pipe, keeping the pressure injection pressure at 0.5 +/-0.1 MPa, and forming a pouring structure after the mold is removed.
6) As can be seen from coring, the lightweight aggregate is uniformly distributed in the concrete, and the measured compressive strength of the lightweight aggregate high-strength concrete 28d is 52.4 MPa.
From the results of the examples, it can be seen that when the lightweight aggregate high-strength concrete structure described in embodiments 1 to 5 is used for construction, the high-strength cement-based slurry with good fluidity is used for filling the gaps between the lightweight aggregates, so that the lightweight aggregates are not required to be pretreated, the lightweight aggregates are uniformly distributed without floating, the construction is simple and convenient, and the compressive strength of the lightweight aggregate concrete exceeds 50.0 MPa.
The above embodiments are merely illustrative of the technical solutions and features of the present invention, and the purpose thereof is to better enable those skilled in the art to practice the invention, and not to limit the scope of the present invention.
Claims (8)
1. A lightweight aggregate high-strength concrete structure and a construction forming method are characterized in that the lightweight aggregate high-strength concrete structure and the construction forming method are as follows: the method comprises the steps of arranging templates around a pre-cast structure, pouring light aggregate and pre-buried grouting pipes into the templates, leveling particles of the light aggregate, sealing the top surfaces of the surrounding templates by the templates, fixing the surrounding templates by pull rods, pressing and injecting large-flow non-shrinkage high-strength cement-based slurry into the grouting pipes, and removing the templates to form the casting structure.
2. The lightweight aggregate high strength concrete structure of claim 1, wherein said lightweight aggregate high strength concrete structure is comprised of lightweight aggregate filler, grout pipes and high strength cement based grout hardening.
3. The lightweight aggregate high-strength concrete structure according to claim 1, wherein the lightweight aggregate is one or a mixture of pumice, clay ceramsite, shale ceramsite, zeolite, coal gangue, fly ash ceramsite and the like, the cylinder pressure strength is not less than 6.0MPa, and the maximum particle size is 30 mm.
4. The lightweight aggregate high strength concrete structure of claim 1, wherein said form is one of steel, steel wood, plastic composite forms.
5. The lightweight aggregate high strength concrete structure according to claim 1, wherein said grouting pipe is a perforated plastic pipe or a metal pipe, and the sectional shape of the pipe includes a circle, a rectangle, and a polygon.
6. The lightweight aggregate high strength concrete structure of claim 1, wherein said tie rods are single-headed screw building form fasteners.
7. The lightweight aggregate high-strength concrete structure of claim 1, wherein the large-flow shrinkage-free high-strength cement-based slurry is composed of materials such as ordinary silicate cement, silica fume, superfine steel slag micropowder, powdery polycarboxylic acid water reducer, composite expanding agent and the like, the slurry fluidity is less than 15s, the bleeding rate is 0, the 3-day compressive strength is more than 50MPa, the 28-day compressive strength is more than 80MPa, and the 24-hour free expansion rate is 0-0.1%.
8. The construction and forming method of the lightweight aggregate high-strength concrete structure of claim 1, characterized by comprising the following steps:
(1) arranging templates around the template according to the designed structure size;
(2) pouring lightweight aggregate and pre-buried grouting pipes into the template in the step 1, and leveling the lightweight aggregate particles;
(3) sealing the top surfaces of the surrounding formworks in the step 1 by using formworks and fixing by using pull rods;
(4) and (3) injecting the large-flow shrinkage-free high-strength cement-based slurry into the grouting pipe, and removing the mold to form a pouring structure.
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| CN105755979A (en) * | 2016-04-07 | 2016-07-13 | 郑州市市政维护工程有限公司 | Process for constructing cement concrete guardrails |
| CN106166788A (en) * | 2016-07-29 | 2016-11-30 | 淮海工学院 | For producing mould and the technique of haydite foaming precast concrete |
| CN107602039A (en) * | 2017-09-14 | 2018-01-19 | 浙江工业大学 | Grouting ceramsite light composite wallboard and preparation method thereof |
| CN108546007A (en) * | 2018-04-02 | 2018-09-18 | 清华大学 | Structuring cement particle material and preparation method thereof |
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2020
- 2020-11-09 CN CN202011242017.XA patent/CN112502276A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2541550Y (en) * | 2002-05-24 | 2003-03-26 | 孙惠镐 | Dry spreading rough/light aggregate viberation grouting floor |
| CN102249636A (en) * | 2011-05-18 | 2011-11-23 | 江苏名和集团有限公司 | Cement-based shrinkage-free grouting mortar |
| CN102815902A (en) * | 2012-08-28 | 2012-12-12 | 中交二航局第二工程有限公司 | Preparation and application method of high-strength large-flow shrinkage-free cement slurry |
| CN105755979A (en) * | 2016-04-07 | 2016-07-13 | 郑州市市政维护工程有限公司 | Process for constructing cement concrete guardrails |
| CN106166788A (en) * | 2016-07-29 | 2016-11-30 | 淮海工学院 | For producing mould and the technique of haydite foaming precast concrete |
| CN107602039A (en) * | 2017-09-14 | 2018-01-19 | 浙江工业大学 | Grouting ceramsite light composite wallboard and preparation method thereof |
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