KR20160089902A - Mixing materials component for high strength concrete structures and high strength concrete structures manufactured by the same - Google Patents

Abstract

The present invention relates to a mixed material composition for a high strength concrete, and a high strength concrete structure manufactured thereby. More particularly, the mixed material composition for a high strength concrete can maintain performance of blast furnace slag by enabling adjustment of viscosity and exhibition of strength through a mixed material without controlling fineness and amount, etc., of the blast furnace slag to be used while enhancing strength of the concrete. According to the present invention, the mixed material containing blast furnace slag for high strength concrete is prepared by mixing blast furnace slag fine powder and an inorganic additive.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-strength concrete composition for a high-strength concrete and a high-strength concrete structure produced by the same. BACKGROUND OF THE INVENTION < RTI ID = 0.0 >

The present invention relates to a high-strength concrete mixture composition and a high-strength concrete structure produced thereby. More specifically, the present invention relates to a high-strength concrete composition for a high strength concrete, Which is capable of maintaining the performance of the blast furnace slag and improving the strength thereof, and a high strength concrete structure produced thereby.

The present invention was derived from research and development (Ministry of Land, Infrastructure and Transport Science and Technology Promotion Agency's Construction Technology Research Project) conducted as part of the research on manufacturing technology and materials model and guidance of 80-180MPa custom SUPER concrete of Ministry of Land, Control No .: 13 Construction Research A02, Title: Development of manufacturing technology and materials model and guidelines for customized SUPER Concrete of 80 ~ 180MPa class.

Concrete is made by mixing aggregate with cement paste to make various structures. Paste plays a role in bonding and bonding aggregate and aggregate and plays an important role in strength development. However, the concrete produced by using ordinary cement paste and aggregate has a low compressive strength, tensile strength and flexural strength, high cost of materials, and long curing period, which leads to productivity and economy. In order to solve the problems of low tensile strength and bending strength, recently, polymer concrete using a resin such as polyester or a mixture of steel fiber and organic fiber in a conventional cement paste without using cement paste as a binder of concrete Fiber Reinforced Concrete is used in structures requiring high bending strength and compressive strength.

Polymer concrete is superior in properties such as compression, tensile and flexural strength not only higher than ordinary cement concrete but also has excellent properties that can control a wide range of pot life and curing time. However, polyester resin used as a polymer concrete material is generally expensive And the price rises according to international oil price and raw material supply and demand situation. Ultra-high strength concrete reinforced by mixing fiber with ordinary Portland cement has solved the problems of low tensile and flexural strength of concrete, but it has high curing temperature, long curing time and incorporates expensive reinforcing fiber. I have a problem.

It is known to improve the flexural strength by adding sand, quartz powder, silica fume, dispersant, organic fiber, etc. to ordinary portland cement. However, in order to exhibit a predetermined bending strength, it is necessary to cure at 90 ° C for 2 days, Steel fiber and the like are mixed with each other, resulting in problems in terms of productivity and economical efficiency, so that the range of use is limited to a very limited number of special structures.

On the other hand, in recent years, the construction of buildings with more than one hundred floors has been expected to take place in the domestic and international markets due to the efficiency of the land, and large-scale spatial structures such as concrete dome, elevated bridge piers, Are becoming increasingly taller, smaller in cross section, specialized and larger. In order to keep the concrete as a structural material for construction in keeping with such a construction trend, it is required to improve and improve the performance of the concrete. Accordingly, the high strength concrete is a necessary result according to the request of the times.

In the case of manufacturing such ultrahigh strength concrete, there is a disadvantage that it is difficult to produce high quality concrete because of the high unit binder content, the viscosity of the concrete is rapidly increased, and the equipment is overloaded when the concrete is manufactured.

When the viscosity of the ultra high strength concrete is increased, the loss of the slump due to the elapsed time of the concrete transportation becomes large, so that the proper workability can not be secured when the concrete is poured. Also, in order to control the viscosity of the concrete, the strength of the concrete is greatly affected because the concrete is sown at the site arbitrarily. In order to compensate for this, there is a method of lowering the powderiness of the blast furnace slag powder, which is one of the main causes of the improvement of the concrete viscosity, and reducing the amount of the blast furnace slag powder. However, when the blast furnace slag powder is lowered, the strength of the concrete is lowered, In order to reduce the amount of blast furnace slag powder used, the content of Portland cement (OPC) is relatively increased, so that cracks due to hydration heat of concrete There is a problem that the risk increases.

(Document 1) Korean Patent Registration No. 10-1420209 (Apr. 10, 2014) (Document 2) Korean Patent Registration No. 10-0959587 (May 17, 2010)

Accordingly, the present invention has been proposed in order to solve the above-mentioned problems of the prior art, and it has been made possible to control the viscosity and strength of blast furnace slag without mixing the blast furnace slag and the amount of blast furnace Which is capable of maintaining the performance of the blast furnace slag and improving the strength thereof, a process for producing the same, and a high strength concrete structure produced thereby.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide an apparatus and method for controlling the same.

According to one aspect of the present invention for achieving the above objects and other features, there is provided a mixed material of high-strength concrete containing blast furnace slag fine powder, wherein blast furnace slag fine powder and additive are mixed and the additive is an inorganic additive Wherein the high strength concrete mixture is a mixture of the high strength concrete and the high strength concrete.

In one aspect of the present invention, the inorganic additive is selected from the group consisting of an inorganic additive for controlling viscosity for adjusting viscosity, an additive for enhancing strength for enhancing the strength, or an additive for improving complexity capable of enhancing the strength while decreasing viscosity By weight of an inorganic additive.

In one aspect of the present invention, when the inorganic additive is the inorganic additive for viscosity control, it is preferable that the mixed material is a blend of 95 to 99% of blast furnace slag powder and 1 to 5% of an inorganic additive for viscosity control.

In one aspect of the present invention, it is preferable that the inorganic additive for viscosity control is a mixture of 40 to 60% of Na ₂ CO ₃ and 40 to 60% of CaCO ₃ .

In one aspect of the present invention, when the inorganic additive is the additive for improving the strength, it is preferable that the mixed material is a mixture of 95 to 97% of the blast furnace slag fine powder and 3 to 5% of the inorganic additive for improving the strength.

In one aspect of the present invention, it is preferable that the inorganic additive for improving the strength comprises 60 to 80% of CaSO ₄ and 20 to 40% of CaCO ₃ .

In one aspect of the present invention, when the inorganic additive is the additive for improving the performance of the composite, it is preferable that the mixed material comprises 93 to 97% of the blast furnace slag powder and 3 to 7% of the additive for improving the complex performance.

In one aspect of the present invention, it is preferable that the composite performance improving additive is composed of 60 to 80% of CaSO ₄ and 20 to 40% of Na ₂ CO ₃ .

According to another aspect of the present invention, there is provided a high-strength concrete structure manufactured by the above-described high-strength concrete mixture material.

According to the high-strength concrete composition for high-strength concrete according to the present invention and the high-strength concrete structure produced therefrom, it is possible to control the viscosity and strength of the blast furnace slag without mixing the powder and the amount of blast furnace slag, The performance of the blast furnace slag can be maintained and the strength can be improved.

Also, according to the present invention, it is possible to apply the present invention to control viscosity and accelerate the development of strength of concrete having a strength of 40 MPa or more, and it is possible to produce an ultra-high strength concrete structure of 80 MPa class.

The effects of the present invention are not limited to those mentioned above, and other solutions not mentioned may be clearly understood by those skilled in the art from the following description.

1 is a graph showing the results of rheological analysis of a high-strength concrete composition according to the present invention.
FIG. 2 is a table showing the results of analysis of compressive strength for each age according to the composite material composition for high-strength concrete according to the present invention.
3 is a graph showing the results of cumulative micro-hydrothermal analysis for a high-strength concrete mixture material composition according to the present invention.

Further objects, features and advantages of the present invention will become more apparent from the following detailed description and the accompanying drawings.

Before describing the present invention in detail, it is to be understood that the present invention is capable of various modifications and various embodiments, and the examples described below and illustrated in the drawings are intended to limit the invention to specific embodiments It is to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Further, terms such as " part, "" unit," " module, "and the like described in the specification may mean a unit for processing at least one function or operation.

In the following description of the present invention with reference to the accompanying drawings, the same components are denoted by the same reference numerals regardless of the reference numerals, and redundant explanations thereof will be omitted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Hereinafter, a mixed material for a high strength concrete according to a preferred embodiment of the present invention, a method for manufacturing the same, and a high strength concrete structure manufactured by the method will be described.

First, a mixing material for high-strength concrete according to the present invention will be described.

The mixed material for high-strength concrete according to the present invention is a mixed material of high-strength concrete containing blast furnace slag fine powder, wherein the blast furnace slag fine powder and the additive are mixed, and the additive is an inorganic additive.

The inorganic additive is an inorganic additive selected from the group consisting of an inorganic additive for viscosity control for adjusting viscosity, an additive for enhancing strength for increasing strength, or an additive for improving complexity capable of improving the strength while decreasing viscosity .

In the following description of the embodiments, the technical background in which the numerical range suggested by the present invention has a critical meaning will be described.

The fluidity of concrete is deformed when it receives initial external force (including its own weight) above the yield strength, and after deformation, plastic deformation acts on the direction of the applied force and the deformation increases. In other words, if the plastic viscosity is high, the object will be deformed continuously in the direction of deformation after the initial deformation of the object. However, if the plastic viscosity is low, deformation will be stopped unless continuous external force is applied after the initial deformation.

In the case of general slag powder, when the mixing ratio is increased, the plastic viscosity becomes too high. Therefore, the concrete is slowly deformed according to the deformation rate of the plastic viscosity because the deformation by the plastic viscosity is dominant not by the external force. Therefore, although the concrete has the property of flowing itself, the deformation of the concrete is slowly deformed by the plastic viscosity and filled in the form even if the work such as vibration, compaction (additional external force after the initial deformation) Conversely, if the viscosity is excessively lowered by excessively adding the viscosity controlling admixture, the concrete is not deformed unless continuous external force is applied. Therefore, when the concrete is cast, continuous vibration and compaction are required. (This phenomenon is expressed as poor workability of the concrete).

In Na ₂ CO ₃ , the Na + ion is a Group 1 element and the reactivity is quite fast. Therefore, the strength of the initial strength is increased, while the strength of the initial strength is decreased. CaCO ₃ is used to compensate for long-term strength due to Na + ions.

CaSO ₄ is mixed into slag powder and ionized in the water when it is applied to concrete, so it is separated into Ca ++ and SO ₄ by ++ separation. Dual Ca ++ are used in the cement hydration SO ₄ ++ is to create a lean eth- gayiteu. Etrinite is a reaction that takes a few moments to hydrate, and it plays a role in securing the rigidity of the concrete before the initial CHS gel is formed in the concrete. Therefore, it is effective to increase the initial strength, but if SO ₄ ++ is added too much, the excessive formation of etrinite may cause the expansion failure and the strength may be lowered. In addition, the initial rapid development of ettringite initially blocks the moisture inflow pathway of the concrete's lining materials, so that if the strength enhancement initially occurs, the strength decreases in the long term.

CaCO ₃ is used as an alkali stimulant to accelerate the reaction of slag powder and to compensate for the deterioration of long-term strength due to overuse of CaSO ₄ . It is effective in improving initial strength, but it has lower initial strength enhancement effect than CaSO ₄ . CaCO ₃ promotes the reactivity of slag powder but does not affect the fluidity or coagulation of the binder and is therefore used for both viscosity control and strength enhancement.

Example 1

When the inorganic additive is an inorganic additive for viscosity control for controlling the viscosity, it is composed of a mixture of 95 to 99% of the blast furnace slag powder and 1 to 5% of the inorganic additive for viscosity control. At this time, the inorganic additive for viscosity control is composed of 40 to 60% of Na ₂ CO ₃ and 40 to 60% of CaCO ₃ .

If the inorganic additive is less than 1%, it is difficult to reduce the plastic viscosity of the binder to 30% or less, and the effect and performance of the product are not greatly improved. If the inorganic additive is more than 5%, the plastic viscosity of the binder is too low to be applied to the concrete The workability can not be ensured.

In case of less than 40% of Na ₂ CO ₃ having a function to lower the plastic viscosity of slag powder, when there is no accelerator related to other coagulation in the slag powder, it should be mixed with 0.4% or more of the minimum slag powder and so in the additive 1% Na ₂ CO ₃ can be reduced to 40%) 30% plastic viscosity, Na ₂ CO ₃ that, if it exceeds 60%, the plastic viscosity when mixed with at least 5% of slag powder is sharply decreased The workability of the concrete is lowered (3.0% for the slag powder).

The lower limit of 40% of CaCO ₃ , which provides the function of slag activation and long-term strength assurance, should be controlled to be less than 60% of Na ₂ CO ₃ , so that it is used proportionally over 40% ₂ CO ₃ content should be controlled to 40% or less, so that it is used in proportion of 60% or more.

Example 2

Subsequently, when the inorganic additive is an additive for strength enhancement for improving the strength, it is made up of a mixture of 95 to 97% of the blast furnace slag fine powder and 3 to 5% of the inorganic additive for improving the strength. At this time, the inorganic additive for improving the strength is composed of 60 to 80% of CaSO ₄ and 20 to 40% of CaCO ₃ .

In this case, when the inorganic additive is less than 3%, the strength is not increased by more than 10% (CaSO ₄ : 60%) for 3 days, when the inorganic additive is more than 5%, when the CaSO 4 is 80%, the slag powder The content of CaSO ₄ is more than 4% in slag powder. In general, the content of CaSO ₄ is up to 6.5% because the average content of slag powder is 2.5% (less than 4.0% in winter and less than 1.0% in summer) , And the content of SO ₃ (58.6% in CaSO ₄ ) is 3.809% (based on slag powder SO ₃ : 4.0 or less, based on KS).

In case of less than 60% of CaSO ₄ , which gives initial strength strengthening function, the strength of 10% or more strength is not improved over 3 days (when 3% of mineral additive is mixed), and when it exceeds 80%, slag powder satisfies KS standard do.

When the CaCO _{3 content} is less than 20%, the long-term strength development is reduced (it is difficult to obtain a slag powder grade 3 KS quality standard age 28 activity index 75 or more). When the CaCO ₃ content is more than 40% And the strength is not increased by more than 10% for 3 days (when 3% of the inorganic additive is mixed).

Example 3

Next, when the inorganic additive is a composite performance improving additive capable of improving the strength while lowering the viscosity, it is made of a mixture of 93 to 97% of the blast furnace slag fine powder and 3 to 7% of the additive for improving the complex performance. In this case, the additive for improving the performance of the composite is composed of 60 to 80% of CaSO ₄ and 20 to 40% of Na ₂ CO ₃ .

Here, the additive for improving the composite performance has a lower limit of 3% and is mixed to ensure a plastic viscosity of 20%. The upper limit of 7% is applicable to the summer (CaSO ₄ : 1.0 or lower) and slag powder Powder) to control the SO ₃ content to 4.0 or less.

In addition, CaSO ₄ having a lower limit of 60% is used to control the content of Na ₂ CO ₃ within 40%, and having an upper limit value of 80% is applicable to the summer (CaSO ₄ : 1.0 or less) Slag Powder) to control the SO ₃ content to 4.0 or less.

And Na ₂ CO ₃ (20%) is mixed with 0.6% (inorganic additive: 3%) or more in the slag powder, and the sintering viscosity can be secured to 20%. The slag powder having the upper limit value of 40% This is because the plastic viscosity decreases sharply when mixed with more than 7% (2.8% in slag powder), which reduces the workability of the concrete.

Meanwhile, the inventors of the present invention have confirmed through experiments the results of analysis of rheology, cumulative micro-hydrothermal heat, and aging compressive strength for a high-strength concrete mixture composition according to the present invention.

FIG. 1 is a graph showing the results of rheological analysis of a high-strength concrete mixture material composition according to the present invention, FIG. 2 is a table showing the results of analysis of compressive strength for each high-strength concrete mixture material according to the present invention, 3 is a graph showing the results of cumulative micro-hydrothermal analysis for a high-strength concrete mixture material composition according to the present invention. 1 to 3, SP-1, SP-2 and SP-3 each show an inorganic additive for adjusting viscosity, an inorganic additive for improving strength, and an inorganic additive for improving complexity, SP represents a commonly used SP (Super Plasticizer).

According to the present invention, in the case of the blended material for concrete of blast furnace slag mixed with the inorganic additive for viscosity control, it is confirmed that the plastic viscosity is reduced by 30% or more when 40 to 60% of the high strength concrete of 40 MPa or more is added to the cement weight Respectively.

In case of mixed concrete for blast furnace slag mixed with inorganic additive for improving strength, the compressive strength was increased to 10% or more at 3 days of age at the addition of 40 to 60% of the weight of cement to the high strength concrete of 40 MPa or more, 5% or more.

Also, in the case of blast furnace slag mixed concrete having mixed performance improving type inorganic additive which improves the strength while lowering the viscosity, the blending viscosity of the high strength concrete of 40 MPa or more and the addition of 40 to 60% , And the compressive strength was improved by 3% or more at 3 days and 5% or more at 7 days.

According to the high-strength concrete composition for high-strength concrete according to the present invention as described above and the high-strength concrete structure produced thereby, it is possible to control the viscosity and the strength of the blast furnace slag without mixing the blast furnace slag, And the strength of the blast furnace slag can be improved. The present invention can be applied to the control of the viscosity and the promotion of the strength of the concrete for a high strength concrete of 40 MPa or more. There is an advantage that a concrete structure can be produced.

The embodiments and the accompanying drawings described in the present specification are merely illustrative of some of the technical ideas included in the present invention. Accordingly, the embodiments disclosed herein are for the purpose of describing rather than limiting the technical spirit of the present invention, and it is apparent that the scope of the technical idea of the present invention is not limited by these embodiments. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (9)

In a mixed material of high-strength concrete containing blast furnace slag fine powder,
Wherein the blast furnace slag powder is mixed with an additive, and the additive is an inorganic additive
Mixed material of high strength concrete.
The method according to claim 1,
Wherein the inorganic additive is an inorganic additive selected from the group consisting of an inorganic additive for viscosity control for adjusting viscosity, an additive for enhancing strength for increasing the strength, or an additive for improving complex performance for improving the strength while lowering the viscosity
Mixed material of high strength concrete.
3. The method of claim 2,
When the inorganic additive is the inorganic additive for viscosity control, the mixed material is a mixture of 95 to 99% of blast furnace slag fine powder and 1 to 5% of an inorganic additive for viscosity control
Mixed material of high strength concrete.
The method of claim 3,
Wherein the inorganic additive for viscosity control comprises 40 to 60% of Na ₂ CO ₃ and 40 to 60% of CaCO ₃
Mixed material of high strength concrete.
3. The method of claim 2,
When the inorganic additive is the additive for improving the strength, the mixed material is a mixture of 95 to 97% of the blast furnace slag fine powder and 3 to 5% of the inorganic additive for improving the strength
Mixed material of high strength concrete.
6. The method of claim 5,
Wherein the inorganic additive for improving the strength comprises 60 to 80% of CaSO ₄ and 20 to 40% of CaCO ₃
Mixed material of high strength concrete.
3. The method of claim 2,
When the inorganic additive is an additive for improving the performance of the composite, the mixed material is a mixture of 93 to 97% of blast furnace slag powder and 3 to 7% of a composite performance improving additive
Mixed material of high strength concrete.
8. The method of claim 7,
The composite performance improving additive is composed of 60 to 80% of CaSO ₄ and 20 to 40% of Na ₂ CO ₃
Mixed material of high strength concrete.
A high strength concrete structure produced by the high strength concrete mixture according to any one of claims 1 to 8.

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