KR20140112195A - Cement zero binder for concrete having high fluidity and nature-friendly concrete having high fluidity comprising the same - Google Patents
Cement zero binder for concrete having high fluidity and nature-friendly concrete having high fluidity comprising the same Download PDFInfo
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- KR20140112195A KR20140112195A KR20130026583A KR20130026583A KR20140112195A KR 20140112195 A KR20140112195 A KR 20140112195A KR 20130026583 A KR20130026583 A KR 20130026583A KR 20130026583 A KR20130026583 A KR 20130026583A KR 20140112195 A KR20140112195 A KR 20140112195A
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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
- C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/34—Flow improvers
-
- 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
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
-
- 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
Abstract
Description
The present invention relates to a cementitious binder for high fluidity concrete, and more particularly, to a cementitious binder for high fluidity concrete which can secure sufficient strength and high fluidity without using any cement at all, Copper concrete.
In concrete using cement, the compressive strength is determined by the water-cement ratio. In order to increase the compressive strength and lower the drying shrinkage, the water-cement ratio should be lowered. If the water-cement ratio is lowered to a certain level or less, the fluidity is significantly reduced and mixing and casting is impossible. To overcome this, a fluidizing agent is added as a water reducing agent. The fluidizing agent is mainly composed of naphthalene (PNS) system using electrostatic repulsion and polycarboxylic acid (P.C) system using dispersibility through steric hindrance. Naphthalene and polycarboxylic fluidizing agents are important additives in concrete formulations because they have excellent dispersibility in cement paste. However, the two fluidizing agents are characterized by low chemical dispersibility at high pH (above 13.5).
However, cement is an environmental load material that contains heavy metals such as hexavalent chromium and the amount of eluted water is harmful to the human body due to strong alkali, and generally produces about 0.8 tons of carbon dioxide when producing 1 ton of cement. In recent years, blast furnace slag There is a tendency to use cement-based alkali-active binders. That is, cement-free alkali-active binders can contribute to image enhancement as eco-friendly materials that can save resources and significantly reduce CO 2 emissions, as well as heavy metals such as hexavalent chromium, which are eluted from cement.
However, since the existing developed cement-based alkali activated binders have significantly lower fluidity than cement at the same strength, the unit water per unit volume of concrete is increased in order to secure workability. At this time, the strength is lowered and the material separation occurs. Also, since the cement-based alkali active binder uses an alkaline inorganic material having a high pH such as NaOH or Na 2 SiO 3 as an activator, the paste has a high pH. Particularly, in order to exhibit high strength, a very strong alkali activator must be used, so that the alkali active binder paste for high strength has high pH (pH 13 or more).
For this reason, the cement-based fluidizing agent can not be used in the cement-based alkali active binder, and it is impossible to form a high strength (dissolution).
For the above problems, it is necessary to develop a fluidizing agent optimized for the cement-based alkali-active binder for the concrete formulation using cement-based alkali-active binder, but this is practically impossible and requires much time and research. Therefore, it is necessary to develop a blending ratio of cement-based alkali-active binder which can lower the pH through combination of alkaline activators and secure high strength in order to use the conventional curing fluidizing agent as it is.
Accordingly, there is a great need in the art for a new composition of cementitious binder which can solve this problem and which can be applied to high-flow concrete.
As a result of efforts to solve the above problems, the inventors of the present invention have completed the present invention by developing a cement binder having a new composition capable of lowering pH and securing strength.
Accordingly, it is an object of the present invention to provide a cement composition which can simultaneously use a conventional fluidizing agent for cement by using three or more alkaline inorganic materials so that the pH is somewhat low but high strength can be obtained, And to provide a cementitious binder for homogeneous concrete.
Another object of the present invention is to provide a high-strength and high-durability concrete by lowering the unit water content and the water-binder ratio in the mixing, and a new composition of high-melting-point concrete capable of exhibiting the required strength even in a large amount of Fly- To provide a cement bonded material.
The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.
In order to achieve the above-mentioned object of the present invention, the present invention provides a method for producing a steel sheet comprising 15 parts by weight to 20 parts by weight of an alkali activator comprising 3 or more alkaline inorganic materials per 100 parts by weight of raw material including at least one of blast furnace slag and fly ash The present invention provides a cementitious binder for high dynamic concrete,
In a preferred embodiment, the alkali activator comprises sodium sulfate, a fluorosilicic salt and a calcium-containing inorganic material.
In a preferred embodiment, the alkali activator comprises 10 to 20% by weight of sodium sulfate, 20 to 30% by weight of a fluorosilicic salt, and 50 to 70% by weight of a calcium-containing inorganic material.
In a preferred embodiment, the fluorosilicic salt is selected from the group consisting of sodium fluoride, zinc silicon fluoride, magnesium fluoride.
In a preferred embodiment, the calcium-containing inorganic material is selected from the group consisting of calcium hydroxide, calcium carbonate and calcium silicate.
In a preferred embodiment, the raw material comprises 65 to 100% by weight of blast furnace slag and 0 to 35% by weight of fly ash.
The present invention also provides an eco-friendly high-flowable concrete comprising a cement mortar binder for high-flow concrete and a polycarboxyl (P) type fluidizing agent or a naphthalene (PNS) type fluidizing agent.
In a preferred embodiment, the polycarboxyl (P) type fluidizing agent is contained in an amount of 1 to 2 parts by weight per 100 parts by weight of the cemented binder for high fluidity concrete.
In a preferred embodiment, the naphthalene (PNS) -based fluidizing agent is included in an amount of 3 to 5 parts by weight per 100 parts by weight of the cement based binder for high fluidity concrete.
The present invention has the following excellent effects.
First, according to the present invention, by using three or more alkaline inorganic materials, the pH is somewhat low but high strength can be obtained, so that conventional fluidizing agents for cement can be used concurrently, thereby ensuring high fluidity at the time of field installation.
Further, according to the present invention, it is possible not only to produce a high-strength and high-durability concrete by lowering the unit water content and the water-binder ratio, but also to exhibit the required strength even in a large amount of Fly-ash substitution.
FIG. 1A is a photograph of pH measurement of a cement based binder B1 for high fluidity concrete according to an embodiment of the present invention, FIG. 1B is a photograph of pH measurement of a cement based binder 1 (B2) of Comparative Example 1 obtained in Comparative Example 1, FIG. 1C is a photograph of the pH of the Comparative Cement Binder 2 (B3) obtained in Comparative Example 2, and FIG. 1D is a photograph of the pH of the cement.
FIG. 2 is a graph of FT-IR analysis performed to confirm whether or not the fluidizing agent for cement works properly in a strong alkaline environment.
Although the terms used in the present invention have been selected as general terms that are widely used at present, there are some terms selected arbitrarily by the applicant in a specific case. In this case, the meaning described or used in the detailed description part of the invention The meaning must be grasped.
Hereinafter, the technical structure of the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.
However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Like reference numerals used to describe the present invention throughout the specification denote like elements.
The technical feature of the present invention is that a fluidizing agent can be used as a polycarboxyl (PC) -based fluidizing agent and a naphthalene (PNS) -based fluidizing agent at a high water-binding material ratio, It is a cementitious binder for a new composition of high-kinetic concrete that can increase the viscosity.
That is, in the present invention, similar to the conventional cement-based alkali active binder, the raw materials including at least one of blast furnace slag and fly ash, which are industrial by-products, and an alkaline activator for stimulating the latent hydraulic properties of the raw materials However, unlike the conventional method, by combining an alkaline inorganic material of three or more components with an alkaline activator, the pH is somewhat low, but high strength can be obtained.
Accordingly, the present invention relates to a cement admixture for high fluidity concrete, comprising 15 parts by weight to 20 parts by weight of an alkali activator comprising 3 or more alkaline inorganic materials per 100 parts by weight of the raw material including at least one of blast furnace slag and fly ash Lt; / RTI >
Here, the blast furnace slag and the fly ash can be used in parallel for the purpose of using the blast furnace slag alone or considering the fluidity and lowering the unit cost. Therefore, the raw material may include 65 to 100 wt% of blast furnace slag and 0 to 35 wt% of fly ash. The compounding ratio of the raw materials is an experimentally determined optimal value for securing self-packing in flow characteristics while exhibiting a required strength.
The alkali-activating agent of the present invention includes sodium sulfate, a fluoride-containing inorganic material and a calcium-containing inorganic material, wherein the calcium-containing inorganic material is an alkaline inorganic material serving as a main activating agent for causing a hydration reaction, and sodium sulfate and fluoride- It is an alkaline mineral material that acts as a co-activator of speed and long-term strength development. Particularly, it is preferable that sodium sulfate is contained in an amount of 10 to 20% by weight based on the total weight of the alkali activator, 20 to 30% by weight of a fluorosilicic salt, and 50 to 70% by weight of a calcium-containing inorganic material.
The fluorosilicic salt used in the present invention is a compound containing a silicon fluoride ion (SiF 6 2+ ), and any known fluorosilicic salt having a property of dissolving SiF 6 2+ ions in water at room temperature may be used, Sodium fluoride, sodium silicon fluoride, zinc silicon fluoride, magnesium silicon fluoride, and the like.
In addition, the calcium-containing inorganic material may be selected from the group including calcium hydroxide, calcium carbonate and calcium silicate.
The components and mixing ratios of these alkali activators can be adjusted to ensure a low pH that can apply a polycarboxyl (PC) fluidizing agent or a naphthalene (PNS) type fluidizing agent in order to secure hydraulic properties to the raw materials while securing high flowability And is an optimal value determined through a number of experiments.
As a result, the present invention can provide an eco-friendly high-performance concrete containing a cementitious binder for high-fluid concrete and a polycarboxyl (P) type fluidizing agent or a naphthalene (PNS) type fluidizing agent.
That is, as described above, since the alkali activator included in the cement based binder for eco-friendly high-performance concrete of the present invention is composed of three or more alkaline inorganic materials and is relatively low in pH, polycarboxyl (PC) Naphthalene (PNS) type fluidizing agent can be used.
When the environmentally-friendly high-fluidity concrete of the present invention uses a polycarboxyl (PC) type fluidizing agent, the polycarboxyl (PC) type fluidizing agent may be used in an amount of 1 to 2 parts by weight per 100 parts by weight of the cement based binder. When a naphthalene (PNS) type fluidizing agent is used, 3 to 5 parts by weight may be used per 100 parts by weight of the cement binder.
Example 1
, 84 weight% of blast furnace slag powder, 5 weight% of fly ash fine powder, 11 weight% of an alkali activator (7 weight% of calcium hydroxide, 1 weight% of sodium sulfate and 3 weight% of sodium silicon fluoride) 1.
Example 2
, 84 weight% of blast furnace slag powder, 5 weight% of fly ash fine powder, 11 weight% of an alkali activator (7 weight% of calcium hydroxide, 3 weight% of sodium sulfate and 1 weight% of sodium silicon fluoride) 2.
Example 3
84 weight% of blast furnace slag powder, 3 weight% of fly ash fine powder, 13 weight% of alkali activator (7 weight% of calcium hydroxide, 3 weight% of sodium sulfate and 3 weight% of sodium silicon fluoride) 3.
Comparative Example 1
93% by weight of blast furnace slag powder, 7% by weight of an alkali activator (4% by weight of calcium hydroxide and 3% by weight of sodium hydroxide) were uniformly mixed to prepare Comparative Cemented Binder 1.
Comparative Example 2
90 weight% of blast furnace slag powder and 10 weight% of alkali activator (10 weight% of sodium silicate) were uniformly mixed to prepare Comparative Example Cemented
Comparative Example 3
91 weight% of the blast furnace slag fine powder and 9 weight% of the alkali activator (9 weight% of calcium hydroxide) were uniformly mixed to prepare Comparative Example Cemented Binder 3.
Comparative Example 4
90 weight% of blast furnace slag powder, 10 weight% of an alkali activator (7 weight% of calcium hydroxide and 3 weight% of sodium sulfate) were uniformly mixed to prepare Comparative Cemented Binder 4.
Comparative Example 5
90 weight% of blast furnace slag fine powder, 10 weight% of alkali activator (7 weight% of calcium hydroxide, 3 weight% of sodium silicon fluoride) were uniformly mixed to prepare Comparative Example Cemented Binder 5.
Experimental Example 1
(B1) obtained in Example 3 as the binder, the comparative uncured binder 1 (B2) obtained in Comparative Example 1, the comparative uncured binder 2 (B3) obtained in Comparative Example 2, the blast furnace slag fine powder (Water + binder) was carried out using 100% (slag) and OPC 100% (OPC) to perform a fluidity test (Mini slump test).
Also, the pH and the 28-day compressive strength were measured for each paste subjected to the paste test, and the results are shown in Figs. 1A to 1D and Table 2.
At this time, the water-binder ratio was 40%, and the addition amount of the naphthalene-based fluidizer and the polycarboxyl-based fluidizer was 0.5% of the weight of the binder.
From Table 1, it can be seen that the fluidity of the high-flowability cementitious binder 3 (B1) of the present invention is similar to that of cement. However, the conventionally known cementitious binder 1 (B2) and the comparative cementitious binder 2 (B3) can not secure the fluidity even if the fluidizing agent is added.
On the other hand, it can be seen from Table 2 and Figs. 1A to 1D that even if the fluidizing agent is added to the cement admixture 1 (B2) and the comparative cement admixture 2 (B3) . In other words, when the slag is added with water only, the pH is 12.1. Therefore, when the fluidizing agent is added, the flowability is superior to that of the cement (OPC), but in order to impart latent hydraulic properties to the slag, alkali activation with strong alkalinity It is because the fluidizing agent does not work properly due to the high pH of the added alkali activator.
On the other hand, it can be seen that the highly flowable cementless binder 3 (B1) using the three-component alkali activator as in the present invention is superior in compressive strength at 28 days as compared with Comparative Examples 1 and 2, have.
Experimental Example 2
PC2, PC2 + calcium hydroxide, PC2 + sodium hydroxide, PC2 + waterglass (sodium silicate, Na (sodium silicate), Na2SO4, Na2SO4, and Na2SO4) were tested for polycarboxylate (PC2) 2 SiO 3 ) was subjected to FT-IR analysis and the results are shown in FIG.
As shown in FIG. 2, the peak of the sub chain of Polycarboxilate (PC2), which is a high performance water reducing agent, is detected at 1730 (cm -1 ), and the strong alkali NaOH, waterglass (sodium silicate, Na 2 SiO 3 ) It can be seen that the chain is broken in the high alkali environment and is not detected at the corresponding frequency. However, when mixed with a relatively weak alkaline Ca (OH) 2 , a peak in the 1730 (cm -1 ) frequency band is detected, indicating that the subchain is not damaged. However, when Ca (OH) 2 alone is used as an alkali activator, the hydration reaction is delayed, the reactivity is weak, and the strength of the binder is very low.
Experimental Example 3
The compressive strengths of the high-strength concrete binders 1 to 3 obtained in Examples 1 to 3 and the comparative cementitious binders 3 to 5 obtained in Comparative Examples 3 to 5 were tested and the results are shown in Table 3. At this time, the water-binder ratio (W / B) was 48.5% and the fine aggregate-binder ratio (S / B) was 2.45. At that time, the fine aggregate was used as a standard yarn. The addition amount of the polycarboxyl type fluidizing agent was 0.5% of the weight of the binder.
It can be seen from the following Table 3 that, compared with the case where only calcium hydroxide is used as the activator or calcium hydroxide and sodium sulfate are used as the activator or calcium hydroxide and sodium fluoride are used as compared with the comparative examples, the three-component alkali activation including calcium hydroxide, It is found that the compressive strength of the cement bonded material using the cement is better.
The above experimental examples show that the cement based binder containing the three-component alkali activator has lower pH than the conventional cement binder and can be used in combination with the fluidizing agent used for cement, It is possible to form eco-concrete having compressive strength.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, Various changes and modifications will be possible.
Claims (9)
Wherein the alkali activator comprises sodium sulfate, a fluorosilicic salt, and a calcium-containing inorganic material.
Wherein the alkali activator comprises 10 to 20% by weight of sodium sulfate, 20 to 30% by weight of a fluorosilicic salt, and 50 to 70% by weight of a calcium-containing inorganic material.
Wherein the fluorosilicic salt is selected from the group consisting of sodium fluoride, zinc silicon fluoride, magnesium fluoride, and the like.
The calcium-containing inorganic material is selected from the group consisting of calcium hydroxide, calcium carbonate and calcium silicate.
Wherein the raw material comprises 65 to 100% by weight of blast furnace slag and 0 to 35% by weight of fly ash.
Wherein the polycarboxyl (PC) -based fluidizing agent is contained in an amount of 1 to 2 parts by weight per 100 parts by weight of the cement based binder for high fluidity concrete.
Wherein the naphthalene (PNS) fluidizing agent is contained in an amount of 3 to 5 parts by weight per 100 parts by weight of the cement based binder for high fluidity concrete.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160053387A (en) * | 2014-11-04 | 2016-05-13 | (주)에스엠테크 | Cementless promotion-type admixture, and cementless composition comprising it |
| KR20190059481A (en) * | 2017-11-23 | 2019-05-31 | 전남대학교산학협력단 | Super low heat cementless binder for mass concrete |
| KR20200014431A (en) * | 2017-06-29 | 2020-02-10 | 미쓰이스미토모겐세쓰 가부시키가이샤 | Concrete composition and its manufacturing method |
| KR20200027632A (en) * | 2018-09-05 | 2020-03-13 | (주)에스엠테크 | Reaction accelerator for non-sintering cement concrete and composition of non-sintering cement concrete comprising it |
| KR20220158896A (en) * | 2021-05-24 | 2022-12-02 | 삼성물산 주식회사 | Composition for manufacturing carbon reduced composites and carbon reduced composites manufactured therefrom |
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| KR102140827B1 (en) * | 2018-11-22 | 2020-08-04 | 전남대학교산학협력단 | Powder-type Alkali activator of Alkali activated Slag binder for high-temperature curing, Alkali-activated slag binder containing the activator for high-temperature curing, concrete composite and product containing the binder |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100639658B1 (en) | 2004-10-04 | 2006-10-30 | (유)한국기계 | Aquatic hardening grout composites for repairing reinforced concrete structures submerged in the awter and repairing method thereof |
| KR101014866B1 (en) * | 2009-06-26 | 2011-02-15 | 전남대학교산학협력단 | Alkall-activated masonry products with no cement |
| KR101085044B1 (en) * | 2010-11-03 | 2011-11-18 | 주식회사 씨엠디기술단 | Inorgarnic binder for manufacturing secondary concrete product |
| KR101140561B1 (en) * | 2011-07-29 | 2012-05-02 | 아세아시멘트주식회사 | High flowing-low heating concrete composition for carbon dioxide reduction |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160053387A (en) * | 2014-11-04 | 2016-05-13 | (주)에스엠테크 | Cementless promotion-type admixture, and cementless composition comprising it |
| WO2016072622A3 (en) * | 2014-11-04 | 2017-04-27 | (주)에스엠테크 | Cement-free accelerating admixture and cement-free composition including same |
| KR20200014431A (en) * | 2017-06-29 | 2020-02-10 | 미쓰이스미토모겐세쓰 가부시키가이샤 | Concrete composition and its manufacturing method |
| KR20190059481A (en) * | 2017-11-23 | 2019-05-31 | 전남대학교산학협력단 | Super low heat cementless binder for mass concrete |
| KR20200027632A (en) * | 2018-09-05 | 2020-03-13 | (주)에스엠테크 | Reaction accelerator for non-sintering cement concrete and composition of non-sintering cement concrete comprising it |
| KR20220158896A (en) * | 2021-05-24 | 2022-12-02 | 삼성물산 주식회사 | Composition for manufacturing carbon reduced composites and carbon reduced composites manufactured therefrom |
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