KR101359210B1 - Cement mixture, panel by using it and method for constructing floor structure by using it - Google Patents

Cement mixture, panel by using it and method for constructing floor structure by using it Download PDF

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KR101359210B1
KR101359210B1 KR20120039609A KR20120039609A KR101359210B1 KR 101359210 B1 KR101359210 B1 KR 101359210B1 KR 20120039609 A KR20120039609 A KR 20120039609A KR 20120039609 A KR20120039609 A KR 20120039609A KR 101359210 B1 KR101359210 B1 KR 101359210B1
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South Korea
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panel
parts
cement
floor structure
present
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KR20120039609A
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Korean (ko)
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KR20130117013A (en
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조창근
한병찬
서정환
김윤용
권영진
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조선대학교산학협력단
호서대학교 산학협력단
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Architecture (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Environmental & Geological Engineering (AREA)
  • Building Environments (AREA)

Abstract

A cement mixture composed of a mixture of 30 to 50 vol. Of binder, 40 to 60 vol. Of filler, and 2.0 to 5.0 vol. Of synthetic fiber, and a cement composite formed by combining the blended water with this cement mixture are poured into 100 vol. A panel is formed.

Description

Cement mixture, panel using same and floor construction method using same {CEMENT MIXTURE, PANEL BY USING IT AND METHOD FOR CONSTRUCTING FLOOR STRUCTURE BY USING IT}

The present invention relates to cement, and more particularly, to a cement mixture, a panel constructed using the same, and a method of constructing a floor structure using a panel composed of the cement mixture.

Recently, as the building's ultra high and large scales progress, the reinforced concrete underground structures are also becoming deeper, larger, and multiplexed. In order to construct such a large underground structure, long span is inevitably required.

On the other hand, the construction of the floor structure is diversified due to the development of construction technology, out of the conventional site casting method including the formwork. Although the certification time for the fireproof structure for the floor structure is 2 hours, the demand for stronger fire resistance is increasing as the underground structure is multiplexed and enlarged. For example, in the case of underground parking lots, the amount of heat generated has increased as the use of polymer materials in vehicles has increased and vehicle occupancy density has increased. Therefore, the necessity of strengthening from the conventional 2-hour fireproof structure to the 3-hour fireproof structure is increasing.

The development of technology for such a floor structure is being accelerated due to the high-rise building, etc., for example, the Republic of Korea Patent Publication No. 2005-65510 is disclosed.

The above patent relates to a method of constructing a concrete slab of a building structure. The method of constructing a half slab by synthesizing a rebar / steel truss with a non-structural lightweight material such as ALC (Autoclaved Lightweight Concrete) or lightweight foamed concrete is performed. Presented.

However, since the above technique uses a conventional general cement, it is difficult to make a long span and the amount of rebar is increased.

In addition, the above technique not only frequently causes construction troubles such as cracking or leakage of the floor structure member during construction, but also has a problem that it is impossible to realize a fireproof structure for two hours or more under the same conditions.

Therefore, construction technology that can dramatically reduce the amount of rebar increases due to the long span, secure economic feasibility, realize fire resistance structure under the same conditions and actively control defects such as cracks and leaks during construction. do.

The technical problem to be solved by the present invention is to provide a cement mixture and a panel using the same to reduce the amount of rebar increases with long span and to realize a three-hour fire resistant structure.

In addition, another technical problem to be solved by the present invention is to provide a construction method of the floor structure that can actively control the defects such as cracks or leaks during construction.

In order to solve the above technical problem, the cement mixture of the present invention is composed of a mixture of 30 to 50 vol, binder 40 to 60 molten filler and 2.0 to 5.0 vol of synthetic fiber with respect to 100 vol. Is composed of 60 to 90 parts by weight of cement, 10 to 40 parts by weight of fly ash and blast furnace slag fine powder, the synthetic fibers are polypropylene (PP) fibers, polyethylene (PE) fibers and polyethylene terephthalate (PET) islands It is preferable that it is a single or two or more types of synthetic fibers selected from the group consisting of.

In addition, the first panel of the present invention formed by pouring a cement composite constituted by combining 30 to 40 parts by weight of the blended water with respect to 100 parts by weight of the cement mixture, the first panel is the first lower part of the bottom structure and It is preferably formed integrally, the shear reinforcement for shear reinforcement is disposed on the upper portion of the first panel, it is preferable that the irregularities are formed on the upper portion of the first panel.

In one embodiment of the present invention, the shear reinforcing bar, it is preferable to include a closed first shear reinforcement and the open second shear reinforcement.

In addition, the second panel of the present invention formed by pouring a cement composite constituted by combining 30 to 40 parts by weight of the blended water with respect to 100 parts by weight of the cement mixture, the second panel is to reinforce the second lower root Preferably, the cement composite is formed by pouring some or all of the cement composite on the upper portion, and the unevenness is formed on the upper portion of the second panel.

On the other hand, the method of the present invention for constructing a floor structure using the first panel and the second panel, the step of installing a temporary stand on the column; Installing the first panel between the pillars; Joining the first lower root of the first panel; Installing the second panel in a slab area surrounded by the first panel; Reinforcing the upper main roots on the first panel and the second panel; Placing concrete on top of the first panel and the second panel; And a step of removing the temporary stand.

In one embodiment of the present invention, the joint of the first lower root, it is preferable to use a coupler joint.

In one embodiment of the present invention, it is preferable that the upper main rod that is placed on the upper portion of the first panel is passed through the lower portion of the shear reinforcement to penetrate the pillar portion.

The present invention as described above has the effect of reducing the use of rebar compared to the conventional reinforced concrete floor structure, to improve the economics and simplify the construction.

In addition, the present invention has the effect of achieving a three-hour refractory structure.

In addition, the present invention has the effect of actively dealing with defects during construction.

1 and 2 are perspective views of one embodiment of a panel cast with a cement mixture according to the present invention.
3A to 3D are exemplary views for explaining a method of constructing a floor structure using the panel of the present invention.
Figure 4 compares the results of the flexural strength test for the general reinforced concrete floor structure and the floor structure constructed in accordance with the present invention when the same amount of rebar is applied.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Terms including ordinals such as first, second, etc. may be used to describe various elements, but the elements are not limited by such terms. These terms are used only to distinguish one component from another.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a component, or a combination thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

First, the cement mixture of this invention is demonstrated.

The cement mixture of this invention is comprised by mixing 30-30 volume of binders, 40-60 volume of fillers, and 2.0-5.0 volume of synthetic fibers with respect to 100 volume parts of powder materials.

In this case, the synthetic fibers used are preferably polypropylene (PP) fibers, polyethylene (PE) fibers and polyethylene terephthalate (PET) fibers alone or two or more synthetic fibers selected from the group consisting of.

For example, in consideration of economics, it is preferable that the volume of the PP fiber and the PE fiber is 2.0-3.0 parts uniformly mixed.

For homogeneous mixing, the diameter of the synthetic fiber is 20 to 100um, and preferably 30 to 40um expresses excellent performance. The length of the synthetic fiber is 10 to 50 mm, preferably 20 to 30 mm. The length of the synthetic fiber forms a discharge passage of water vapor at a high temperature in a fire, and plays a very important role in suppressing sudden explosion. In addition, when the pores are formed as much as the diameter of the synthetic fibers, the fire resistance performance of the material can be improved by the latent heat due to the melting of the synthetic fibers and the thermal conductivity decreases due to the pores.

Binder is a group consisting of cement, fly ash, blast furnace slag fine powder, it is used by mixing the cement and the remaining binder, preferably consisting of 60 to 90 parts by weight of cement, 10 to 40 parts by weight of the remaining binder.

The filler is composed of a general filler and a refractory filler, and 30 to 40 parts by weight of the blended water is added to 100 parts by weight of the mixture of the binder, filler and synthetic fiber of the present invention to form a cement-based composite. In addition, an air entraining agent (AE agent) is added to maintain 5-15% of the voids in the skeleton. It is preferable to mix 7-9 volume parts of AE agents.

The cement composite prepared as described above is poured in a predetermined form in a flow state to produce a panel of the present invention.

Hereinafter, the panel of the present invention will be described with reference to the drawings.

1 and 2 are perspective views of one embodiment of a panel cast with a cement mixture according to the present invention, in which FIG. 1 is a panel used as a beam member (hereinafter referred to as a 'beam member panel') 21 and FIG. 2 is a slab. The panel used as the member (hereinafter referred to as the slab member panel) 31 is shown.

Referring to FIG. 1, the beam member panel 21 is integrally formed with the lower main root 22 in the floor structure by pouring the cement composite described above. The lower root 22 is preferably configured such that their lengths intersect, respectively, in order to join at the junction.

The panel 21 of the present invention is provided with shear reinforcing bars 23 and 24 for shear reinforcement of the end column head. Here, the outermost end of the pillar is provided with a closed shear reinforcing bar 23, and the remaining open shear reinforcing bar 24 is preferably to have a hook shape on the top to facilitate the reinforcement of the upper main rod (not shown).

In addition, the panel 21 of the present invention, the concave-convex 25 is formed at predetermined intervals in order to secure the integrity with the upper site-cast concrete.

In addition, referring to FIG. 2, the slab member panel 31 of the present invention is formed by reinforcing the lower main root (not shown) and partially or totally pouring the cement composite of the present invention described above on the upper part. Shear bars are not required at this time. The slab member panel 31 also forms the unevenness 35 at predetermined intervals in order to secure the integrity of the top-casting concrete.

Panels 21 and 31 of the present invention having the technical features as described above have a compressive strength of 30 to 50 MPa, a bending strength of 150 to 300 MPa, a tensile strain of 10 to 20%, and a 20 mm coating standard as a quality control standard (7 days). ISO834 3 hours fireproof structure performance, fine dispersion crack characteristics will be.

3A to 3D are exemplary views for explaining a method of constructing a floor structure using the panel of the present invention.

Figure 3a shows a step of installing the temporary stand 51 on the column (1). The upper portion of the temporary table 51 is provided with a plate 52 so that the end of the panel 21, 31 of the present invention can be mounted. The method of installing the temporary material 51 on the pillar 1 includes embedding, field anchoring, epoxy, and the like, and preferably embedding type. In addition, the hypothesis 51 of the present invention is preferably installed to enable vertical adjustment.

FIG. 3B shows a step of installing the beam member panel 21 of the present invention between the pillars 1 and joining the lower freckle 22 provided in the panel 21.

 The beam member panel 21 of the present invention supports the load through the temporary stand 51, and the load during work and pouring is supported through its bending resistance.

Based on the span 10m, the panel 21 of the present invention is 60 ~ 100mm thickness to ensure the bending strength that can sufficiently resist this.

Thereafter, the lower root 22 of the panel 21 is joined. Joints may be used in the field welded joints, coupler joints, overlapping joints, etc., in order to suppress the interference with the reinforcement of the column (1), it is preferable to use a coupler joint (42).

3C shows the process of placing the slab member panel 31 in the slab area surrounded by the beam member panel.

The slab member panel 31 of the present invention supports the load through the temporary stand 51, and the load at the time of work and placing is supported through its bending resistance. At this time, each slab member panel 31 has a bending strength that can sufficiently resist the thickness of 40 ~ 60mm reference 5m in the form of a one-way slab.

The beam member panel 21 and the slab member panel 31 preferably secure a separation distance of about 30 to 50 mm.

3d shows the process of placing the upper rotator 62 on the beam and slab.

The upper main root 62 of the beam portion passes through the lower end shear bars 23 and 24 of the beam member panel 21 to penetrate the column portion.

Next, the upper rotator of the slab part is strengthened. First, if the lower main bar of the slab part is segmented in the beam part, which is a problem of the fixing length, reinforcing bars penetrating the beam can be inserted. If it is determined that the integrity is secured only by the upper main root, this may be omitted.

Upper slab 62 of the slab portion is in principle reinforcement in the order of short side direction after the long side direction, so as to continue in all parts, may pass through the upper portion of the reinforcement. In addition, if there are joints, but may be used, such as overlapping joints, welded joints and coupler joints, it is preferable to use overlapped joints without interference with column reinforcement.

After that, the site concrete is poured to the remaining upper portion with a predetermined thickness. The floor structure of the present invention in which pillars, beams, and slab members are integrated by concrete pouring is constructed.

Finally, the construction method of the present invention consists of a process of removing the temporary stand 51 and the temporary member after securing the initial strength.

Hereinafter, the effect of reducing the amount of rebar used due to the direct tensile performance and the bending performance of the panels 21 and 31 of the present invention will be examined. That is, when the cement composite formed from the cement compound according to the present invention was applied, the effect of reducing the steel was examined.

The floor structure fins were 600mm in width, 180mm in total thickness, 4,000mm in length, D13 @ 150mm in tension of the main reinforcing bar, and D13 @ 300mm in compression side. The thickness of the panels 21 and 31 of the present invention was 60mm.

Figure 4 shows the experimental results, when the same amount of reinforcement is compared with the results of the flexural strength test for the general reinforced concrete floor structure, and the floor structure constructed in accordance with the present invention. In the figure, A is the flexural strength of the general reinforced concrete floor structure, B is the flexural strength of the floor structure constructed by the present invention.

As shown in the figure, it can be seen that the floor structure constructed by the present invention shows a result of more than 60% (90.3 kN / 56.4 kN) or more at the maximum bending moment strength.

Therefore, it can be seen that the floor structure built by the construction method of the present invention as described above is capable of improving the strength and long span under the same conditions. In addition, if the above strength is applied to structural calculation, significant reduction of rebar can be expected, thereby securing economic feasibility.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the following claims.

1: pillar 11: cast iron
21: Beam member panel 22: Lower root
23, 24: shear rebar 25: uneven
31: slab member panel 35: irregularities
42: Coupler 51: Hypothesis
62: upper rotator

Claims (7)

delete delete delete delete With respect to 100 parts by volume, the binder consists of 30 to 50 parts by volume, fillers 40 to 60 parts by volume and synthetic fibers 2.0 to 5.0 parts by volume, wherein the binder is 60 to 90 parts by weight of cement and 10 to 40 parts by weight of fly ash. And blast furnace slag fine powder, wherein the synthetic fibers are single or two or more synthetic fibers selected from the group consisting of polypropylene (PP) fibers, polyethylene (PE) fibers and polyethylene terephthalate (PET) fibers. About cement mixture made,
A first panel and a second panel formed by pouring a cement composite formed by combining 30 to 40 parts by weight of the blended water to 100 parts by weight of the cement mixture, wherein the first panel is integral with the first lower root of the floor structure And a shear reinforcing bar including a closed first shear bar and an open second shear bar in the upper part of the first panel, and having irregularities formed in the upper part of the first panel. The second panel is formed by reinforcing a second lower peripheral root and casting part or all of the cement composite on the upper part thereof, and having irregularities formed on the upper part of the second panel, wherein the first panel and the second panel are formed. In the method of constructing the floor structure using,
Installing a temporary stand on a column;
Installing the first panel between the pillars;
Joining the first lower root of the first panel;
Installing the second panel in a slab area surrounded by the first panel;
Reinforcing the upper main roots on the first panel and the second panel;
Placing concrete on top of the first panel and the second panel; And
Construction method comprising the step of removing the temporary construction.
The construction method according to claim 5, wherein the joint of the first lower peripheral root uses a coupler joint.
The construction method according to claim 5, wherein the upper main rod, which is placed on an upper portion of the first panel, passes through the lower portion of the shear bar and penetrates through the pillar portion.
KR20120039609A 2012-04-17 2012-04-17 Cement mixture, panel by using it and method for constructing floor structure by using it KR101359210B1 (en)

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KR20120039609A KR101359210B1 (en) 2012-04-17 2012-04-17 Cement mixture, panel by using it and method for constructing floor structure by using it

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KR101359210B1 true KR101359210B1 (en) 2014-02-07

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CN110130557A (en) * 2019-04-30 2019-08-16 同济大学 It is a kind of for combining the cement base profile and its building method of concrete slab

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100602152B1 (en) * 2005-06-21 2006-07-25 (주)핸스건설 Precast concrete panel, construction method and structure of precast concrete panel
KR100978882B1 (en) 2007-11-13 2010-08-31 지에스건설 주식회사 Cantilever precast deckplate for composite slab and bridge construction method using the same
KR100984249B1 (en) 2010-06-10 2010-09-30 주식회사 오케이컨설턴트 Bridge construction method using strength connector detail and composite curing pannel
KR101000526B1 (en) * 2008-07-21 2010-12-14 (주)에이엠에스 엔지니어링 Manufacturing method of high-strength refractory and quake-proof panel using refractory and quake-proof mortar composition

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100602152B1 (en) * 2005-06-21 2006-07-25 (주)핸스건설 Precast concrete panel, construction method and structure of precast concrete panel
KR100978882B1 (en) 2007-11-13 2010-08-31 지에스건설 주식회사 Cantilever precast deckplate for composite slab and bridge construction method using the same
KR101000526B1 (en) * 2008-07-21 2010-12-14 (주)에이엠에스 엔지니어링 Manufacturing method of high-strength refractory and quake-proof panel using refractory and quake-proof mortar composition
KR100984249B1 (en) 2010-06-10 2010-09-30 주식회사 오케이컨설턴트 Bridge construction method using strength connector detail and composite curing pannel

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