KR101356967B1 - Ecofriendly low cement binder composite containing Free CaO - Google Patents
Ecofriendly low cement binder composite containing Free CaO Download PDFInfo
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- KR101356967B1 KR101356967B1 KR20120020091A KR20120020091A KR101356967B1 KR 101356967 B1 KR101356967 B1 KR 101356967B1 KR 20120020091 A KR20120020091 A KR 20120020091A KR 20120020091 A KR20120020091 A KR 20120020091A KR 101356967 B1 KR101356967 B1 KR 101356967B1
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- concrete
- free cao
- cement
- calcium
- low cement
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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
Abstract
The present invention is characterized in that it comprises a calcium-based durability improving material containing Free CaO, environmentally friendly to improve the concrete compressive strength lowering and weakening neutralization resistance that has been pointed out as a problem when the conventional low cement binder is applied to concrete Low cement binder composition, composed of 10 ~ 30wt% cement, 30 ~ 85wt% admixture composed of any one or more of ash admixture or slag admixture, and 5-40wt% calcium-based durability improving material containing free CaO, Free It provides an environmentally friendly low cement binder composition characterized in that the content of CaO is 2 ~ 8wt%.
Description
The present invention relates to an environmentally friendly low cement binder composition, specifically, comprising a calcium-based durability improving material containing free CaO, concrete compression has been pointed out as a problem when the conventional low cement binder is applied to concrete It relates to an environmentally friendly low cement binder composition that improves strength degradation and weakening of neutralization resistance.
Cement is widely used as a binder in construction and civil engineering. Generally, cement means portland cement, and its main components are lime, silica, alumina, iron oxide, and the like. Cement is made through a process of mixing the raw materials containing these in a suitable proportion, and then powdering them by adding an appropriate amount of gypsum to a molten and fired clinker. Since cement is manufactured through a process of heating limestone at a high temperature, a large amount of carbon dioxide is emitted during the manufacturing process. Based on the LCI database of the Ministry of Knowledge Economy, 948 kg is generated to produce 1 ton of cement. It is reported that the amount of carbon dioxide generated in the cement manufacturing process is estimated to be 7% of the global greenhouse gas emissions.
Recently, the importance of eco-friendliness has been highlighted throughout the industry, and methods for reducing the amount of cement have been actively studied in the construction and civil engineering fields. Specifically, technologies for low cement binders having low cement content, cement binders using other components instead of cement, and the like have been introduced. However, concrete with cementless binder is rarely utilized due to cost problems due to the use of expensive activators and deterioration of construction properties. In addition, even in the case of concrete applied with a low cement binder has a problem such as lowering the compressive strength during construction and weakening the neutralization resistance has a limited problem in its application.
Looking at the problem that occurs when the low cement binder is applied to concrete in detail as follows. Since the low cement binder contains less calcium silicate compound, which is the main component of cement, CSH hydrate (calcium silicate hydrate) and Ca produced by the reaction of calcium silicate compound with water when constructing concrete manufactured using low cement binder The amount of (OH) 2 (calcium hydroxide) is insufficient compared with the case of using a general cement binder. CSH hydrate plays an important role in strength development, and when the CSH hydrate, which is the result of the reaction between water and cement at the beginning of construction, is insufficient, the initial expression of the compressive strength of concrete is sluggish. In addition, Ca (OH) 2 is to in the long-term action enable the admixture, such as fly ash or slag there is to serve to prevent the role and neutralized to produce CSH hydrate, Ca (OH) 2 This lack in long-term action Since the production of CSH hydrate is reduced, the compressive strength is lowered, while the neutralization of concrete after construction is accelerated, and the neutralization resistance function required to prevent corrosion of steel, etc. is also reduced.
Therefore, the technology for the implementation of eco-friendly low cement binders that can solve the problems of the above-mentioned reduction in compressive strength and weakening the neutralization resistance when applied to concrete while reducing the amount of cement in the binder is very urgent.
The present invention is characterized in that it contains less calcium content, environmentally friendly and calcium-based durability improving material containing free CaO, compared to the case where the existing low cement binder is applied to concrete, such as compressive strength and neutralization resistance of concrete The purpose is to provide an environmentally friendly low cement binder composition that improves the performance.
In order to solve the above problems, the present invention, 10 ~ 30wt% cement, 30 ~ 85wt% admixture composed of any one or more of the ash admixtures or slag admixtures and 5 ~ 40wt% calcium-based durability improving material containing free CaO To provide an environment-friendly low cement binder composition, characterized in that the content of Free CaO is 2 ~ 8wt%.
At this time, the calcium-based durability improving material containing Free CaO, characterized in that the content ratio of Free CaO is 30 ~ 100wt%, the content ratio of Free CaO is 87 ~ 96wt%, content ratio of MgO 3 ~ 10wt%, SO It may be characterized in that the content ratio of 3 is 1-3 wt%.
Meanwhile, the calcium-based durability improving material containing Free CaO may be a by-product generated when heating a mixture of coal and limestone or a mixture of petroleum and limestone to 800 to 950 ° C.
According to the eco-friendly low cement binder composition according to the present invention has the following effects.
1. It is eco-friendly due to less cement content than conventional cement binder composition.
2. Compared with the case where the existing low cement binder is applied to concrete, the development of compressive strength is excellent.
3. It has better neutralization resistance than the existing low cement binder is applied to concrete.
4. When applied to concrete, salt resistance and dry shrinkage resistance of concrete are increased.
The present invention provides an environmentally friendly low cement binder composition comprising Free CaO.
Specifically, the present invention is composed of 10 ~ 30wt% of cement, 30 ~ 85wt% of admixture composed of any one or more of the ash admixture or slag admixture and 5 ~ 40wt% of the calcium-based durability improving material containing Free CaO, Free It provides an environmentally friendly low cement binder composition characterized in that the content of CaO is 2 ~ 8wt%.
The cement is a composition generally used as a component of the binder required for the production of concrete. The main components of the cement are CaO, SiO 2 , Al 2 O 3 and Fe 2 O 3, etc. These are the basis for estimating and judging the composition of the main minerals that govern the action of hydration, condensation, hardening, etc. do. The cement causes a hydration reaction with water, thereby allowing the coagulation and curing reactions to proceed. Representative products of the hydration reaction proceeding at room temperature and atmospheric pressure are CSH hydrate (calcium silicate hydrate) and Ca (OH) 2 (calcium hydroxide).
The general binder composition is composed mostly of cement, but the binder composition according to the present invention is a low cement binder composition having a cement content of 10 to 30 wt%, which significantly reduces the amount of cement used and is environmentally friendly.
The ash admixture includes a fly ash, a bottom ash, and the like, and the slag admixture includes a solvent, a nonmetallic substance, a metal oxide, and the like on a sewage when melting ore or metal in a slag furnace, a cupola, or the like. As a generic term for floating or leftovers, it includes blast furnace slag fine powder and electric furnace slag fine powder.
The admixture is composed of any one or more of the ash admixture or slag admixture, the content is 30 ~ 85wt%.
The calcium-based durability improving material containing the free CaO is a key configuration in the present invention. Specifically, the content of free CaO in the calcium-based durability improving material containing Free CaO is in the range of 30 to 100 wt%. The calcium-based durability improving material containing the free CaO can be obtained from a by-product generated when heating the mixture of coal and limestone to 800 ~ 950 ℃.
The low cement binder composition with low cement content contains less calcium silicate compounds, so CSH hydrates (calcium silicate hydrates) produced by the reaction of calcium silicate compounds with water when constructing concrete blended with low cement binder compositions ) And Ca (OH) 2 (calcium hydroxide) are insufficient compared to the case of using a general cement binder.
CSH hydrate is a material that plays an important role in strength development, and when it is insufficient, the initial compressive strength of the concrete is lowered during construction. In addition, the alkaline component of Ca (OH) 2 is to serve to to in the long-term action enable the admixture, such as fly ash or slag prevent the role and neutralized to produce CSH hydrate, Ca (OH) 2 This lack long-acting In this case, less CSH hydrate is produced, resulting in lower compressive strength, faster neutralization of concrete, and lowering neutralization resistance function required to prevent corrosion of steel.
The Ca-based durability improving material containing Free CaO solves the problem caused by the low cement binder composition by supplying free CaO with good reactivity to the binder composition. Specifically, Free CaO is a reactive calcium compound that reacts with water to produce calcium hydroxide (Ca (OH) 2 ), and exhibits its initial strength by virtue of the magnetoscopic effect. In addition, Ca 2+ ions released from calcium hydroxide are cured by reacting with silicate (SiO 2 ) or aluminate (Al 2 O 3 ) included in the admixture to produce CSH hydrate and CAH hydrate (calcium aluminate hydrate). Proceed to show the hydration mechanism similar to cement.
Free CaO is also a substance that causes rapid heat generation and volume expansion. Therefore, when excessively added, it may cause the initial fluidity decrease and crack occurrence of concrete, so it is necessary to limit the content of the component. Therefore, the calcium-based durability improving material containing Free CaO is preferably added in the range of 5 to 40 wt% according to the content of Free CaO, and as a result, the content of Free CaO in the total binder composition is 2 to 8 wt%. desirable.
On the other hand, the calcium-based durability improving material containing Free CaO may be characterized in that the content ratio of Free CaO content of 87 ~ 96wt%, MgO content of 3 ~ 10wt%, SO 3 content of 1 ~ 3wt%.
The MgO is characterized to react with the calcium hydroxide (Ca (OH) 2) produced by the Free CaO in the long-term age produced the Mg (OH) 2 to reduce the cracking of the mortar by volume expansion, SO 3 is initially in an ion state Although it has high solubility, it is used as a coagulation retardant in cement, but it plays a role in promoting the strength of concrete by accelerating reaction against slag admixture showing latent hydraulic properties.
Hereinafter, a look at the specific test data for the various performance of the concrete to which the eco-friendly low cement binder composition according to the present invention is applied.
1. Test 1
In order to compare the physical properties of the concrete to which the eco-friendly low cement binder composition according to the present invention is applied to the general conventional concrete and the general low cement concrete, the compressive strength, salt resistance and dry shrinkage rate, etc. are measured as shown in Table 1 below. It was.
Formulation 1 is composed of 20 wt% cement, 25 wt% fly ash, 40 wt% blast furnace slag powder, 15 wt% calcium-based durability improving material containing free CaO, but the binder composition is applied, characterized in that the content of Free CaO is 6wt% Formulation 2 is composed of a cement composition 20wt%, fly ash 30wt%, blast furnace slag fine powder 35wt%, calcium-based durability improving material containing free CaO 15wt% but the content of free CaO is 6wt% Applied formulation.
[Table 1]
(1) compressive strength
The results of measuring the compressive strength of concrete having a blend according to [Table 1] are shown in Table 2 below.
[Table 2]
Looking at [Table 2] it is confirmed that the concrete (compound 1 and 2) to which the present invention is applied, the compressive strength is initially expressed higher than the general low cement concrete, the compressive strength is higher than the general concrete after 28 days of age. have.
(2) salt resistance
The results of measuring chloride ion penetration depth and chloride ion diffusion coefficient of concretes having a formulation according to [Table 1] are shown in Table 3 below.
[Table 3]
Looking at [Table 3], the concrete (compound 1 and 2) to which the present invention is applied does not have a deeper chloride ion penetration depth and a smaller chloride ion diffusion coefficient than general concrete and low cement concrete. You can see it. In particular, in the case of formulation 1, salt resistance was the best.
(3) dry shrinkage
The results of measuring the rate of change in drying shrinkage of concretes having a blend according to [Table 1] are shown in [Graph 1] below.
[Graph 1]
In general, in the case of low cement concrete, drying shrinkage is less likely to occur than that of general concrete. In the concrete to which the present invention is applied, the compound 2 has the smallest change in length according to drying.
2. Test 2
In order to compare the physical properties of the concrete to which the eco-friendly low cement binder composition according to the present invention is applied to the general conventional concrete and the general low cement concrete, the compressive strength and the neutralization resistance were measured with the formulation as shown in Table 4 below.
Formulation 3 is composed of 20wt% of cement, 20wt% of fly ash, 40wt% of blast furnace slag powder, 20wt% of calcium-based durability improving material containing Free CaO, but the binder composition is applied, characterized in that the content of Free CaO is 7.9wt%. Formulation 4 is a binder, characterized in that the composition is composed of 20wt% cement, 28wt% fly ash, 40wt% blast furnace slag powder, 12wt% calcium-based durability improving material containing Free CaO, but the content of Free CaO is 4.8wt% The composition is applied formulation, formulation 5 is composed of 20wt% of cement, 20wt% of fly ash, 30wt% of blast furnace slag, 20wt% of calcium-based durability improving material containing Free CaO, but the content of Free CaO is 7.9wt% It is the formulation to which the binder composition to be applied was applied.
[Table 4]
(1) compressive strength
The results of measuring the compressive strength of concrete having a blend according to [Table 4] are shown in Table 5 below.
[Table 5]
Looking at [Table 5] it can be seen that the concrete (compound 3 to compound 5) to which the present invention is applied is superior in the expression of compressive strength compared to general low cement concrete, and both the initial compressive strength and the compressive strength after 28 days of age are excellent. Particularly, in the case of the compound 3, the compressive strength was shown to be higher than that of the general concrete from the early age.
(2) neutralization resistance
The results of measuring the neutralization penetration depth of the concretes having the formulations according to [Table 4] are shown in Table 6 below.
TABLE 6
Looking at [Table 6] it can be seen that the concrete (compound 3 to formulation 5) to which the present invention is applied has a very good neutralization resistance when compared with general low cement having low neutralization resistance as well as general concrete.
Claims (4)
The calcium-based durability improving material containing Free CaO is a by-product generated when heating a mixture of coal and limestone or a mixture of petroleum and limestone at 800 to 950 ° C., and the content ratio of Free CaO is 87 to 96 wt% and MgO is 3 Eco-friendly low cement binder composition, characterized in that the content ratio of ~ 10wt%, SO 3 is 1 ~ 3wt%.
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| KR20120020091A KR101356967B1 (en) | 2012-02-28 | 2012-02-28 | Ecofriendly low cement binder composite containing Free CaO |
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| KR20120020091A KR101356967B1 (en) | 2012-02-28 | 2012-02-28 | Ecofriendly low cement binder composite containing Free CaO |
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| KR101356967B1 true KR101356967B1 (en) | 2014-02-03 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005029404A (en) | 2003-07-09 | 2005-02-03 | Univ Nihon | Cement composition |
| JP2009035429A (en) | 2007-07-31 | 2009-02-19 | Taiheiyo Material Kk | Hydraulic composition and cured product of the same |
| JP2010006616A (en) | 2008-06-24 | 2010-01-14 | Tobu Kaihatsu Co Ltd | Ecoconcrete such as ecoconcrete block using rpf combustion ash and eco-reproduced aggregate and its manufacturing method |
| US20110023756A1 (en) * | 2006-02-15 | 2011-02-03 | Lafarge Canada Inc. | Binder for mine tailings, alluvial sand and the like |
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2012
- 2012-02-28 KR KR20120020091A patent/KR101356967B1/en active IP Right Grant
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005029404A (en) | 2003-07-09 | 2005-02-03 | Univ Nihon | Cement composition |
| US20110023756A1 (en) * | 2006-02-15 | 2011-02-03 | Lafarge Canada Inc. | Binder for mine tailings, alluvial sand and the like |
| JP2009035429A (en) | 2007-07-31 | 2009-02-19 | Taiheiyo Material Kk | Hydraulic composition and cured product of the same |
| JP2010006616A (en) | 2008-06-24 | 2010-01-14 | Tobu Kaihatsu Co Ltd | Ecoconcrete such as ecoconcrete block using rpf combustion ash and eco-reproduced aggregate and its manufacturing method |
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| KR20130098517A (en) | 2013-09-05 |
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