KR20030036392A - Crack retardant mixture made from flyash and its application to concrete - Google Patents

Crack retardant mixture made from flyash and its application to concrete Download PDF

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KR20030036392A
KR20030036392A KR1020030018725A KR20030018725A KR20030036392A KR 20030036392 A KR20030036392 A KR 20030036392A KR 1020030018725 A KR1020030018725 A KR 1020030018725A KR 20030018725 A KR20030018725 A KR 20030018725A KR 20030036392 A KR20030036392 A KR 20030036392A
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concrete
reducing agent
shrinkage reducing
shrinkage
weight
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KR1020030018725A
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KR100403831B1 (en
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권승안
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주식회사한국포조텍
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/08—Flue dust, i.e. fly ash
    • 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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/34—Non-shrinking or non-cracking materials
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

PURPOSE: Provided are shrinkage reducing admixtures containing fly ash as a main material for reduction of concrete shrinkage cracks, and increase of long-term strength and durability. CONSTITUTION: The shrinkage reducing admixtures contain 30-80wt.% of fly ash, 2-5wt.% of anhydrous gypsum, waste gypsum from fuel gas desulphurization, 8-20wt.% of limestone, and 10-60wt.% of blast furnace slag. The concrete composition contains a mixture of 10-99wt.% of cement and 1-40wt.% of prepared admixtures, and aggregate in a ratio of 1:3 - 1:5, wherein air-entraining agent, water-reducing agent and thickener are optionally added.

Description

콘크리트 균열방지용 수축저감제와 이를 이용한 콘크리트 조성물{Crack retardant mixture made from flyash and its application to concrete}Shrinkage Reducing Agent for Preventing Concrete Cracks and Concrete Compositions Using the Invention {Crack retardant mixture made from flyash and its application to concrete}

본 발명은 콘크리트 균열 방지를 위한 수축 저감제 및 이를 이용한 콘크리트 조성물에 관한 것으로, 더욱 구체적으로는 수화시 콘크리트의 건조 수축을 감소시켜 균열을 방지하고 장기 강도 및 내구성을 증진시키는 수축저감제와 이를 이용한 콘크리트 조성물에 관한 것이다.The present invention relates to a shrinkage reducing agent for preventing concrete cracks and a concrete composition using the same, and more particularly, to reduce the dry shrinkage of concrete during hydration to prevent cracking and to improve long-term strength and durability, and to use the same. It relates to a concrete composition.

현재 각종 공사 현장에서는 콘크리트를 펌프로 압송하는 기계화 시공이 일반화 되어 과거에 비하여 빠른 시공이 이루어지고 있으나, 콘크리트 압송시 편의를위하여 과도한 양의 물이 사용되고 있는 실정이다. 이처럼 시공시에 과량 사용된 물은 추후 많은 균열을 발생시키는데, 이는 시멘트의 응결과정에서 나타나는 수축에 의한 것이다.At various construction sites, the mechanized construction of pumping concrete with pumps is common, and construction is faster than in the past. However, excessive amounts of water are used for the convenience of concrete transportation. As such, the excess water used during the construction generates a lot of cracks later, due to shrinkage in the cement crystal.

이러한 수축 균열을 방지하기 위해서 일반적으로 사용되는 방법은 팽챙 시멘트를 이용하는 것이다. 팽창시멘트로는 K, S, M 및 O형이 미국, 일본 등에서 개발되어 사용되고 있는데, 이들은 시멘트에 (3CaO·Al2O3·CaSO4)·CaO·CaSO4, (3CaO·Al2O3)와 CaSO4, CaO, 또는 CaSO4중의 1종을 적정량 혼합하여 시멘트의 팽창성을 확보하는 것이다.A commonly used method for preventing such shrinkage cracking is to use swelling cement. K, S, M and O types are developed and used in the United States, Japan, etc., and they are used in cement as (3CaO · Al 2 O 3 · CaSO 4 ) · CaO · CaSO 4 , (3CaO · Al 2 O 3 ) And one of CaSO 4 , CaO, or CaSO 4 are mixed in an appropriate amount to secure the expandability of the cement.

팽창시멘트는, (1)에트링게이트 (Ettringite, 3CaO·3CaSO4· 32H2O)의 생성과정에서 수분을 흡수하여 팽창되거나, (2) 추가로 가해지는 CaO가 수산화칼슘의 결정을 형성하면서 팽창되는 것으로 알려져 있다. 그러나, 현재 시판되고 있는 팽창 시멘트는 제조 공정이 복잡하고 비싸므로 일반적인 콘크리트 구조물에 사용하기에는 매우 어려웠다.It is known that the expanded cement expands by absorbing water during the formation of (1) Ettringite (3CaO.3CaSO 4 .32H 2 O), or (2) CaO added is expanded while forming crystals of calcium hydroxide. have. However, commercially available expanded cements are very difficult to use in general concrete structures because of the complicated and expensive manufacturing process.

본 발명은 현존하는 팽창시멘트가 제조과정이 복잡하고, 가격이 높아 일반 콘크리트 구조물에 적용하기 어려운 단점을 극복하기위한 것으로,The present invention is to overcome the disadvantages that the existing expansion cement is difficult to apply to a general concrete structure because the manufacturing process is complicated, high price,

1) 상온에서 배합이 이루어지므로 가격이 저렴하고1) Because the compounding is done at room temperature, the price is low

2) 초기균열의 발생을 방지하며,2) prevent the occurrence of initial crack,

3) 장기 강도가 높으며,3) long-term strength is high,

4) 유산염, 해수염분, 약액, 열 등에 대한 저항성이 높고,4) High resistance to lactate, sea salt, chemicals, heat, etc.

5) 계절특성에 따른 차등배합이 가능함을 특성으로 가지는 수축저감제와, 상기 저감제를 이용한 콘크리트의 조성물을 제안하는데, 그 목적이 있다.5) The present invention proposes a shrinkage reducing agent having a characteristic that differential mixing is possible according to seasonal characteristics and a composition of concrete using the reducing agent.

도 1은 수축저감제를 사용한 콘크리트 조성물과 일반 콘크리트의 길이변화를 나타내는 그래프1 is a graph showing the change in length of the concrete composition and the general concrete using a shrinkage reducing agent

도 2는 수축저감제를 사용한 콘크리트 조성물과 일반 콘크리트의 압축강도를 나타내는 그래프2 is a graph showing the compressive strength of concrete composition and concrete using shrinkage reducing agent

발명의 주요한 기술적 구성은, 플라이애쉬 30 ∼ 80 중량%, 무수석고 2∼5 중량%, 석회석 분말 8 ∼ 20 중량%, 고로슬래그 분말 10 ∼ 60 중량%를 혼합하여 제조되는 수축저감제와, 이 수축저감제 1∼40 중량%와 시멘트 10∼99 중량%를 배합한 원료에, 통상적으로 사용되는 골재를 부가하여 제조되는 콘크리트 조성물이다.The main technical configuration of the present invention is a shrinkage reducing agent prepared by mixing 30 to 80% by weight of fly ash, 2 to 5% by weight of anhydrous gypsum, 8 to 20% by weight of limestone powder, and 10 to 60% by weight of blast furnace slag powder, It is a concrete composition manufactured by adding the aggregate generally used to the raw material which mix | blended 1-40 weight% of shrinkage reducing agents and 10-99 weight% of cement.

이하 본 발명을 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail.

(1) 플라이애쉬(1) fly ash

플라이애쉬는 화력발전소 등에서 부산물로 발생하는 것으로, 분말도는 3100-4600 ㎠/g, 비중은 화학성분 중의 Fe2O3에 의해 좌우되며, 시멘트의 2/3정도인 1.91 ∼ 2.32 정도이다. 입자의 크기는 1 ∼ 140 ㎛ 정도이며, 플라이애쉬의 형태는 거의 대부분이 구형이고, 큰 입자들 가운데는 중앙부가 비어 있는 형태로 존재하거나, 내부가 미세한 구상의 입자로 채워져 있는 것도 있다. 플라이애쉬의 화학적 주성분은 SiO2, Al2O3, CaO등이다. 표 1은 플라이애쉬의 화학성분을 나타낸다.Fly ash is generated as a by-product from thermal power plants, etc. The powder degree is 3100-4600 cm 2 / g, specific gravity is dependent on Fe 2 O 3 in the chemical composition, about 1.91-2.32, about 2/3 of the cement. The particle size is about 1 to 140 μm, and the fly ash is almost spherical in shape, and some of the larger particles are empty in the center or filled with fine spherical particles inside. The main chemical components of fly ash are SiO 2 , Al 2 O 3 , CaO and the like. Table 1 shows the chemical composition of the fly ash.

본 발명에서 플라이애쉬는 전체 수축저감제 중량에서 30 내지 80%의 범위에서 사용되었을때, 가장 바람직한 수축 저감 효과를 나타난다.In the present invention, the fly ash exhibits the most preferable shrinkage reducing effect when used in the range of 30 to 80% in the total shrinkage reducing agent weight.

플라이애쉬의 구성성분Ingredients of Fly Ash 성 분ingredient SiO2 SiO 2 Al2O3 Al 2 O 3 Fe2O3 Fe 2 O 3 CaOCaO MgOMgO SO3 SO 3 Ig-LossIg-loss Insol/RInsol / R 함 량content 47.447.4 17.617.6 9.79.7 14.214.2 0.60.6 1.71.7 5.15.1 1.71.7

(2) 무수석고(2) anhydrous gypsum

본 발명에서 사용하는 석고는 중유, 벙커시유, 유연탄, 무연탄, 석유코크스, 천연 석유 등의 연소시 얻어진 연도 가스내에서 흡수제로 소석회 현탁액을 분무하여 생산된 것으로, 이른바 배연탈황 석고라고 하며, 가스내의 황화물이 소석회 현탁액 중의 CaO성분과 결합하는 분무 건조-흡착방식의 형태로 제조된다. 배연 탈황석고는 화학석고에 비하여 SO3의 함량은 높고 CaO는 낮은 특성을 나타내는 것이 일반적이다.The gypsum used in the present invention is produced by spraying a suspension of slaked lime with an absorbent in flue gas obtained during combustion of heavy oil, bunker oil, bituminous coal, anthracite coal, petroleum coke and natural petroleum. It is prepared in the form of a spray drying-adsorption method which combines with the CaO component in the slaked lime suspension. Flue gas desulfurization gypsum has higher SO 3 content and lower CaO than chemical gypsum.

본 발명의 수축저감제의 성분으로 사용된 석고는, 2 ∼ 5% 범위에서 가장 바람직한 수축 저감효과를 나타낸다.Gypsum used as a component of the shrinkage reducing agent of the present invention exhibits the most preferable shrinkage reducing effect in the range of 2 to 5%.

배연탈황 석고의 구성 성분Components of Flue Gas Desulfurization Gypsum 구 분division Lg-lossLg-loss SiO2 SiO 2 Al2O3 Al 2 O 3 Fe2O3 Fe 2 O 3 CaOCaO MgOMgO SO3 SO 3 배연탈황석고Flue Gas Desulfurization Gypsum 21.0021.00 1.801.80 0.900.90 0.800.80 32.1032.10 0.610.61 42.042.0

(3) 고로슬래그 분말(3) blast furnace slag powder

철광석, 석회석, 코우코스를 원료로 하여 적당한 비율로 조합, 고온에서 용해하여 환원하면 철은 비중이 크기 때문에 고로의 하층부에 가라앉고, 상층부에는 SiO2, Al2O3등이 주성분인 암질이 CaO와 화합하여 용융 상태로 부유한다. 이것을 고로슬래그라 한다. 고로슬래그 분말의 비중은 2.85 ∼ 2.94 정도이며 평균은 2.90정도이다.When reduced to dissolve the iron ore, limestone, Koh course in combination with an appropriate ratio to a raw material, a high temperature iron sinking in the furnace lower part because of a specific gravity of size, the upper part, the Rock Quality of include SiO 2, Al 2 O 3 main components CaO And are suspended in a molten state. This is blast furnace slag. Blast furnace slag powder has a specific gravity of about 2.85 to 2.94 and an average of about 2.90.

고로슬래그의 형상은 매끈한 구곡상의 파면을 갖는 입방상으로, 이를 입도 분석하면 최대입경은 48-150 ㎛, 평균입경은 10-16㎛, 10㎛이하의 량은 33-50%의 범 위에 있으며, 44㎛잔분은 0.8-15.3%정도이다.The shape of the blast furnace slag is a cuboidal shape with a smooth curved wave shape. When the particle size is analyzed, the maximum particle size is 48-150 μm, the average particle diameter is 10-16 μm, and the amount below 10 μm is in the range of 33-50%. 44 micrometer residue is about 0.8-15.3%.

본 발명에서 사용한 고로슬래그 분말은 CaO성분을 함유하고 있으나, 수화열이 없고, 응결시간을 지연시켜 하절기에도 충분한 미장 시간을 확보시켜주므로 초기 균열 방지의 효과를 주는 역할을 수행한다.The blast furnace slag powder used in the present invention contains a CaO component, but does not have a heat of hydration, thereby delaying the setting time, thereby ensuring sufficient plastering time in the summer, and thus plays an effect of preventing initial cracking.

본 발명의 수축저감제에 있어서 10 ∼ 60% 사용되었으며 이 정도 범위내에서 가장 바람직한 수축 저감 효과를 나타낸다.In the shrinkage reducing agent of the present invention, 10 to 60% is used, and within this range, the most preferable shrinkage reducing effect is obtained.

(4) 석회석 분말(4) limestone powder

석회석 분말은 8~20중량%을 사용하는 것으로, 이는 고로 슬래그 분말의 작용을 조절하는 역할을 수행한다. 순수한 석회석의 조성은 CaO 56%, CO₂44% 이지만 보통 고용체로서 MgCO, FeCO3, MnCO3등을 함유하므로 MgO, FeO, MnO 등의 불순성분을 포함하고 있다. 또한, 점토나 갈철광과 같은 광물을 수반할 때가 많은데, 이때에는 SiO2, Al2O3, Fe2O3등의 불순성분을 함유한다.Limestone powder is to use 8 to 20% by weight, which serves to control the action of the blast furnace slag powder. Pure limestone is composed of 56% of CaO and 44% of CO₂, but contains solid impurities such as MgO, FeO, MnO, etc., because it usually contains MgCO, FeCO 3 , MnCO 3, etc. In addition, it often involves minerals such as clay or iron ore, and at this time contains impurities such as SiO 2 , Al 2 O 3 , Fe 2 O 3, and the like.

본 발명에서 석회석의 주 성분은 CaCO3함량이 약 80%(CaO 45%) 이상이면 사용이 가능하며, 8 ∼ 20 중량% 범위 내에서 사용시 가장 바람직하였다.In the present invention, the main component of limestone can be used when the CaCO 3 content is about 80% (CaO 45%) or more, and is most preferable when used within the range of 8 to 20% by weight.

(5) 콘크리트 조성물(5) concrete composition

상기 기술한 수축저감제를 이용한 콘크리트 조성물은 시멘트 10 ∼ 99 중량%와 상기 수축저감제 1 ∼ 40%를 배합한 원료에, 일반적인 골재를 1:3 내지 1:5의 비율로 섞어 제조한다. 시멘트와의 배합시 수축저감제는 시멘트 1 ∼ 40 중량%의 범위를 지키는 것이 바람직한데, 이는 1중량% 보다 적을시에는 수축보상의 효과가 적으며, 40%를 초과하는 경우는 과팽창이 발생하거나 응결이 지나치게 지연될 수 있기 때문이다.The concrete composition using the above-mentioned shrinkage reducing agent is prepared by mixing 10 to 99% by weight of cement and 1 to 40% of the shrinkage reducing agent to a general aggregate in a ratio of 1: 3 to 1: 5. It is preferable to keep the shrinkage reducing agent in the range of 1 to 40% by weight of cement when blended with cement. When it is less than 1% by weight, the effect of shrinkage compensation is less, and when it exceeds 40%, overexpansion occurs. Or condensation may be delayed too much.

또한, 본 발명에서 제시한 콘크리트 조성물을 제조시에 펌프 압송 및 마감 미장공사에 도움이 되는 통상적인 공기연행제, 감수제 및 증점제 등의 부가적인 첨가제를 0.1 ~ 15 중량%를 첨가 할 수도 있다.In addition, 0.1-15% by weight of additional additives such as conventional air entraining agent, water reducing agent and thickener, which are helpful for pump pumping and finishing plastering, may be added when preparing the concrete composition proposed in the present invention.

(a) 공기연행제: 본 발명에서 기술한 공기연행제는 설페이트계 및 포스페이트계, 또는 기타 지방산계 등 통상적으로 사용되는 것으로서, 공기를 연행시키기 위한 혼화제로 고강도 콘크리트 배합시 주로 사용한다. 본 발명에서는 통상적으로 시판되는 공기 연행제인 알킬벤젠술폰산(ABS)를 사용하였다.(a) Air entraining agent: The air entraining agent described in the present invention is commonly used, such as sulfate-based and phosphate-based or other fatty acid-based, and is mainly used in mixing high strength concrete as a admixture for entraining air. In the present invention, a commercially available air entrainer, alkylbenzenesulfonic acid (ABS) was used.

(b) 감수제 : 본 발명에서 기술한 감수제는 시멘트 입자를 분산 및 현탁시키는 작용을 하는 첨가제로, 시멘트 입자를 (粒子)분산 하여 콘크리트의 소요 워커빌리티를 얻는데 필요한 단위 수량을 감소 시키는 역할을 한다. 이러한 감수제로는 통상적으로 설폰산염계의 물질이 사용된다. 본 발명에서는 리그닌 설폰산염 감수제를 사용하였다.(b) Water reducing agent: The water reducing agent described in the present invention is an additive which disperses and suspends the cement particles. The water reducing agent serves to reduce the number of units required to obtain the required workability of concrete by dispersing the cement particles. As such a water reducing agent, sulfonate-based materials are usually used. In the present invention, a lignin sulfonate sensitizer was used.

(c) 증점제 : 본 발명에서 기술한 증점제는 대체로 셀룰로오 유도체 등과 같은 수용성 폴리 사카라이드계의 물질로서 물에 용해될 때 소정의 점도를 가지게 되는 성질이 있다. 이는 점도의 향상으로 인한 유동성 증대 역할 뿐 아니라 내구성 증진효과를 나타낸다. 본 발명에서는 수용성 셀룰로오스 증점제인 하이드록시에틸셀룰로오스를 사용하였다.(c) Thickener: The thickener described in the present invention is generally a water-soluble polysaccharide-based substance such as a cellulose derivative and the like and has a predetermined viscosity when dissolved in water. This not only increases the flowability due to the improvement of the viscosity but also shows the effect of improving durability. In this invention, hydroxyethyl cellulose which is a water-soluble cellulose thickener was used.

이하 제시하는 실시예는 본 발명을 보다 구체적이고 풍부하게 설명하기 위한것으로, 본 실시예가 발명의 모든 내용을 한정하는 것은 아니다.The following examples are provided to explain the present invention more specifically and abundantly, and the present embodiments do not limit all the details of the present invention.

[실시예1] 수축저감제의 제조Example 1 Preparation of Shrinkage Reducing Agent

수축저감제를 제조하기 위하여, 플라이애쉬, 무수석고, 석회석 분말, 고로슬래그 분말을 각각 볼밀을 이용하여 추가 분쇄하여, 200메쉬를 통과하는 분말을 취득하였다. 이들 분말들은 습기의 침투를 방지하기 위하여 무수염화칼슘이 들어 있는 데시케이터 안에 보관하면서 필요량 만큼 덜어내어 사용하였고, 수축저감제의 전형적인 구성 비율은 다음 표 3과 같다.In order to produce a shrinkage reducing agent, fly ash, anhydrous gypsum, limestone powder, and blast furnace slag powder were further ground using a ball mill to obtain a powder which passed 200 mesh. These powders were stored in a desiccator containing anhydrous calcium chloride to prevent moisture infiltration and used as needed, and the typical composition ratio of the shrinkage reducing agent is shown in Table 3 below.

수축저감제의 조성 비율Composition ratio of shrinkage reducing agent 성 분ingredient 비율(중량%)Ratio (% by weight) 플라이애쉬Fly ash 50.050.0 무수석고Anhydrous gypsum 3.03.0 석회석분말Limestone Powder 25.025.0 고로슬래그Blast furnace slag 20.020.0 공기연행제(알킬벤젠술폰산)Air entrainer (alkylbenzenesulfonic acid) 1One 감수제(리그닌설폰산염)Water reducing agent (lignin sulfonate) 0.50.5 증점제(하이드록시 에틸셀룰로오스)Thickener (hydroxyethyl cellulose) 0.50.5

상기 표 3의 비율로 각 성분을 기계적으로 혼합한 후, 이를 이용하여 콘크리트 시편을 제조하였다.After mechanically mixing each component in the ratio of Table 3, to prepare a concrete specimen using this.

[실시예 2] 콘크리트 제조Example 2 Concrete Preparation

상기 수축저감제를 사용한 콘크리트의 성능을 검증하기 위하여, 수축저감재와 통상의 포틀랜트 시멘트, 그리고 모래와 자갈로 구성된 골재를 중량비로 표 4와 같이 혼합하여 콘크리트 시편을 만들었다. 이때, 골재내 자갈의 최대 치수는 약 40mm 였다. 다음 표 4는 이들 재료들을 배합하여 제조한 콘크리트의 조성을 나타낸다. 이때, 수축저감재는 0.5kg 사용되었으며, 비율은 2% 사용되었다.In order to verify the performance of the concrete using the shrinkage reducing agent, the shrinkage reducing material, a conventional portland cement, and aggregates composed of sand and gravel were mixed in a weight ratio to make concrete specimens. At this time, the maximum dimension of the gravel in the aggregate was about 40 mm. Table 4 below shows the composition of the concrete prepared by combining these materials. At this time, the shrinkage reducing material was used 0.5kg, the ratio was used 2%.

콘크리트 제조에 사용된 성분Ingredients used to manufacture concrete 구분division 시멘트(kg)Cement (kg) 수축저감재(kg)Shrinkage Reduction Material (kg) 물(kg)Water (kg) 모래(kg)Sand (kg) 자갈(kg)Gravel (kg) 슬럼프(cm)Slump (cm) 일반콘크리트General Concrete 4.004.00 00 2.002.00 8.008.00 10.0010.00 1818 수축저감재를 첨가한 콘크리트Concrete with shrinkage reducing material 3.503.50 0.500.50 2.002.00 8.008.00 10.0010.00 1818

표 4와 같이 제조한 시편은 20oC 95 %(상대습도) 의 항온항습기에 넣어 양생한 후 틀에서 떼어내어 초기 길이를 측정하였고, 측정 후에는 다시 20oC 60 %(상대습도) 의 항온 항습기에 보관하면서 길이의 변화를 측정하였다. 이때 길의 변화는 다음의 도 1에 제시한 바와 같이, 수축저감제를 사용한 콘크리트가 일반 콘크리트에 비하여 현저하게 적게 나타났다. 또한, 본 발명에서 제시한 수축저감제와 이를 이용한 콘크리트 시편 약 40일간에 걸쳐 관찰한 결과 균열을 관찰 할 수 없었다. 이에 비하여 일반 콘크리트에서는 0.1mm 에서 0.3mm 범위의 균열이 평균 3개 안팎으로 발견되었다.The specimens prepared as shown in Table 4 were cured in a thermo-hygrostat at 20 o C 95% (relative humidity), removed from the mold and measured for an initial length. After measurement, the specimens were again tested at 20 o C 60% (relative humidity). The change in length was measured while being kept in the humidistat. At this time, the change in the road as shown in Figure 1, the concrete using the shrinkage reducing agent appeared significantly less than the general concrete. In addition, the shrinkage reducing agent proposed in the present invention and the concrete specimen using the same for over 40 days as a result of the crack could not be observed. In contrast, average cracks in the range of 0.1 mm to 0.3 mm were found in average in three concretes.

[실시예3]Example 3

도 2는 [실시예2]에서 제조한 시편을 이용하여 압축 강도를 측정했을때 시간에 따른 강도의 변화를 도시한 것이다. 본 도 2에 잘 나타났듯이, 수축저감제를 사용하여 제조한 콘크리트와 일반 콘크리트 사이에 압축강도의 차이는 거의 없었으며, 실험오차 범위내에서 일치하였다.Figure 2 shows the change in strength with time when the compressive strength was measured using the specimen prepared in [Example 2]. As shown in FIG. 2, there was almost no difference in compressive strength between concrete prepared using a shrinkage reducing agent and general concrete, and was consistent within the experimental error range.

위의 실시예에서 상술한 바와 같이, 본 발명에서 제시한 수축저감재는 콘크리트의 수축을 억제함과 동시에, 이를 통하여 균열 발생을 방지하는데 탁월한 효과가 있다.As described above in the above embodiment, the shrinkage reducing material proposed in the present invention has an excellent effect of preventing the occurrence of cracks, while suppressing the shrinkage of the concrete.

Claims (1)

플라이애쉬 30 ∼ 80 중량%, 무수석고 2∼5 중량%, 석회석 분말 8 ∼ 20 중량%, 고로슬래그 분말 10 ∼ 60 중량%를 혼합한 수축저감제와, 이 수축저감재 1∼40 중량%와 시멘트 10∼99 중량%를 배합한 것을 특징으로 하는 균열방지용 콘크리트.A shrinkage reducing agent comprising 30 to 80% by weight of fly ash, 2 to 5% by weight of anhydrous gypsum, 8 to 20% by weight of limestone powder, and 10 to 60% by weight of blast furnace slag powder; A concrete for preventing cracks, comprising 10 to 99% by weight of cement.
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