KR100398653B1 - Crack retardant mixture for concrete and concrete by using it - Google Patents
Crack retardant mixture for concrete and concrete by using it Download PDFInfo
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- KR100398653B1 KR100398653B1 KR10-2002-0009377A KR20020009377A KR100398653B1 KR 100398653 B1 KR100398653 B1 KR 100398653B1 KR 20020009377 A KR20020009377 A KR 20020009377A KR 100398653 B1 KR100398653 B1 KR 100398653B1
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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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/10—Acids or salts thereof containing carbon in the anion
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/26—Carbonates
- C04B14/28—Carbonates of calcium
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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
- 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
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
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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
- 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
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
본 발명은 콘크리트 구조물에 사용되는 수축저감용 콘크리트 조성물에 관한 것으로, 건조수축을 억제시켜 균열을 방지하고 장기 압축강도의 발현율이 높은 수축저감재와 이 저감재를 이용한 콘크리트 조성물을 제공함에 있다.The present invention relates to a concrete composition for reducing shrinkage used in concrete structures, to prevent dry shrinkage to prevent cracking and to provide a shrinkage reducing material having a high expression rate of long-term compressive strength and a concrete composition using the reducing material.
상기 목적을 달성하기 위한 본 발명은The present invention for achieving the above object
흡수제로 소석회(Ca(OH)2) 현탁액을, 200℃∼300℃의 아황산가스가 다량 함유된 기체내에서 분무건조하여 생산된 석고 5∼70 중량%와 나머지 30∼95% 고로슬래그 분말을 혼합하여 조성되는 수축저감재와Mixing the hydrated lime (Ca (OH) 2 ) suspension with a water absorbent in a gas containing a large amount of sulfurous acid gas at 200 ° C to 300 ° C, and mixing the remaining 5 to 70% by weight of gypsum slag powder with the remaining 30 to 95% blast furnace slag powder. Shrinkage reducing material
(a) 시멘트 : 70∼85중량%와(a) cement: 70-85 wt%
(b) 상기 수축저감재: 15∼30중량%를 배합한 원료에, 조립율(F.M) 2.8이상의 모래 또는 50mm 이내의 골재로 조성되는 콘크리트 조성물에 관한 것을 그 기술적요지로 한다.(b) The shrinkage reducing material: The raw material which mix | blended 15-30 weight% with respect to the concrete composition comprised from the sand of a granulation rate (F.M) 2.8 or more or an aggregate within 50 mm is made into the technical summary.
Description
본 발명은 콘크리트 구조물에 사용되는 콘크리트 조성물에 관한 것으로, 보다 상세하게는 콘크리트의 건조수축으로 인한 균열을 방지할 수 있는 수축저감재 와 이를 이용한 콘크리트 조성물에 관한 것이다.The present invention relates to a concrete composition used in a concrete structure, and more particularly, to a shrinkage reducing material and a concrete composition using the same that can prevent cracks caused by dry shrinkage of concrete.
최근들어 건설이 양적으로 증대함과 아울러 콘크리트를 펌프로 압송하는 기계화 시공이 일반화 되었다. 기계화시공은 펌프압송의 편의를 위해 과도한 물이 첨가되고 있는 실정이어서 시공후에 많은 균열하자가 발생하고 있다.In recent years, construction has increased quantitatively, and the mechanized construction of pumping concrete with pumps has become common. Mechanized construction is a situation in which excessive water is added for the convenience of pump pumping, so many crack defects occur after construction.
이러한 균열은 시멘트가 응결되는 과정에서 수축에 의해 발생하는 것으로, 시멘트의 조성성분과 조성비, 시멘트의 분말도, 물의 양 등에 가장 큰 영향을 받는다.Such cracking is caused by shrinkage during cement condensation, and is most affected by the composition and composition ratio of cement, the powder of cement, the amount of water, and the like.
시멘트의 수축균열을 방지하기 위해 칼슘계등의 팽창제 시멘트를 첨가하여 건조수축을 보상하는 정도로 팽창할 수 있는 팽창시멘트을 이용하는 방법이 일반적으로 널리 알려져 있다.To prevent shrinkage cracking of cement It is generally known to use an expansion cement that can expand to a degree that compensates for dry shrinkage by adding a cement-based expander cement.
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.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.
팽창시멘트가 팽창하는 것은, (1)에트링게이트(Ettringite, 3CaO·3CaSO4· 32H2O)의 생성과정에서 수분을 흡수하여 팽창되거나, (2) 추가로 가해지는 CaO가 수산화칼슘의 결정을 형성하면서 팽창되는 것으로 알려져 있다.The expansion cement expands due to (1) expansion by absorbing moisture during the formation of Ettringite (3CaO.3CaSO 4 .32H 2 O), or (2) CaO added to form crystals of calcium hydroxide. It is known to become.
그런데, 지금까지 알려진 팽창시멘트는 그 제조과정이 복잡하고 가격이 높아 일반적인 콘크리트 구조물에 적용하기에는 어려운 실정이다. 따라서, 시멘트 몰탈의 수축량에 해당하는 만큼의 팽창력을 내부에 화학적으로 도입하여 수축을 보상함으로써 균열발생의 원인을 근원적으로 차단하는 수축저감재를 시멘트에 혼합하여 사용하려는 기술이 시도되고 있다.However, the expansion cement known so far is difficult to apply to a general concrete structure because the manufacturing process is complicated and the price is high. Therefore, a technique has been attempted to mix and use a shrinkage reducing material that is essentially blocking the cause of cracks by compensating for shrinkage by chemically introducing expansion force corresponding to the shrinkage amount of cement mortar into cement.
그 대표적인 예가 본 발명자가 개발하여 한국 특허등록 제148438호에 제안한 온돌마감미장용 수축저감몰탈이다. 이 몰탈은 수분이 많은 몰탈에서도 균열방지에 탁월한 효과를 나타내고 있다. 그러나, 이 수축저감몰탈은 생석회 성분의 수화열로 인하여 초기응결시간의 단축으로 인하여 충분한 미장시간을 얻기 힘들어 초기균열이 발생하는 경우가 발생한다.A representative example thereof is a shrinkage reduction mortar for ondol finishing plaster proposed by the present inventor and proposed in Korean Patent Registration No. 148438. This mortar has an excellent effect on crack prevention even in moist mortar. However, this shrinkage reduction mortar is difficult to obtain a sufficient plastering time due to the shortening of the initial setting time due to the heat of hydration of the quicklime component, the initial crack occurs.
본 발명은 지금까지 알려진 팽창시멘트가 그 제조과정이 복잡하며 가격이 높아 일반 콘크리트 구조물에 적용하기 어려운 단점을 개선하기 위한 일련의 연구과정에서 안출된 것으로, 상온에서 배합이 이루어지므로 가격이 저렴하고 초기균열이 발생하지 않음은 물론, 장기 강도의 발현율이 높고 계절특성에 따른 차등배합이 가능한 수축저감재와 이 저감재를 이용한 콘크리트의 조성물을 제안하는데, 그 목적이 있다.The present invention was conceived in a series of researches to improve the disadvantages of the expansion cement known so far is difficult to apply to the general concrete structure because the manufacturing process is complicated and the price is high, because the compounding is made at room temperature, the price is low and early The purpose of the present invention is to propose a shrinkage reducing material and a composition of concrete using the reducing material, in which the cracking does not occur, as well as the expression rate of long-term strength is high and the differential mixing is possible according to seasonal characteristics.
도 1은 수축저감재의 조성에 따른 길이변화를 나타내는 그래프1 is a graph showing the change in length according to the composition of the shrinkage reducing material
상기 목적을 달성하기 위한 본 발명의 콘크리트 조성물은 150℃∼350℃의 석탄연소로에서 얻어진 연도 가스내에서 흡수제인 소석회 현탁액을 분무 건조하여 생산된 석고 5∼70%와 나머지 고로슬래그분말을 혼합하여 수축저감재를 제조한다음,Concrete composition of the present invention for achieving the above object is to mix the remaining blast furnace slag powder with 5 ~ 70% of the gypsum produced by spray drying the suspension of hydrated lime in the flue gas obtained in 150 ℃ to 350 ℃ coal combustion furnace After manufacturing shrinkage reducing material,
(a) 시멘트 : 70∼85중량%와(a) cement: 70-85 wt%
(b) 상기 제조된 수축저감재 15∼30중량%를 배합한 원료에, 조립율(F.M) 2.8이상의 모래 또는 50mm 이내의 골재를 1:3 내지 1:5로 조성함으로서 이루어진다.(b) A composition containing from 15 to 30% by weight of the shrinkage reducing material prepared above is composed of 1: 3 to 1: 5 of sand having a granulation rate (F.M) of 2.8 or more or aggregates within 50 mm.
이하, 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail.
(1) 석고(1) gypsum
본 발명에서 사용하는 석고는 150℃∼350℃의 중유,BC유,유연탄,무연탄,석유코오크스,천연석유등의 연소시 연소로에서 얻어진 연도 가스내에서 흡수제로 소석회 현탁액을 분무 건조하여 생산하는데 연도 가스내의 황화물이 소석회 현탁액중의 CaO 성분과 결합하는 분무건조-흡착방식(SDA방법) 형태로 이루어진다.The gypsum used in the present invention is produced by spray drying the slaked lime suspension with an absorbent in the flue gas obtained in the combustion furnace during the combustion of heavy oil, BC oil, coal briquettes, anthracite coal, petroleum coke and natural petroleum at 150 ° C to 350 ° C. The sulfides in the flue gas are in the form of a spray-drying adsorption method (SDA method) in which the sulfide in the slaked lime suspension is combined with the CaO component.
건조된 석고 분말은 스크랩(SCRAPE)되어 집진된후 저장 사이로(SILO)에 보관된다.The dried gypsum powder is scraped (SCRAPE), collected and stored in a storage cell (SILO).
이와같이 생산된 석고의 화학조성 및 성상은 그 일예가 표 1과 같다.Chemical compositions and properties of the gypsum thus produced are shown in Table 1 as an example.
본 발명에서는 석고를 수축저감재에 5∼70 중량% 첨가하는데, 이는 석고가 5% 미만의 경우 팽창효과가 적어 수축저감 효과를 기대하기 어려우며 70%이상 첨가하면 과팽창 할 수 있기 때문이다.In the present invention, 5 to 70% by weight of gypsum is added to the shrinkage reducing material, because when the gypsum is less than 5%, it is difficult to expect a shrinkage reducing effect, and when it is added to 70% or more, it may overexpand.
(2) 고로슬래그분말(2) blast furnace slag powder
본 발명에서 고로슬래그분말은 수축저감용 혼화재로 유효하게 이용할 수 있는데, 본 발명에서는 고로슬래그분말이 CaO 성분을 함유하고 있으나 수화열이 없고 적절히 응결시간을 지연시켜 하절기에도 충분한 미장시간을 확보시켜 줌으로써 초기 균열의 방지에도 효과적이다.In the present invention, the blast furnace slag powder can be effectively used as an admixture for reducing shrinkage, but in the present invention, the blast furnace slag powder contains CaO components, but does not have a heat of hydration and appropriately delays the setting time, thereby ensuring sufficient plastering time in the summer. It is also effective in preventing cracks.
본 발명에서는 고로슬래그분말을 수축저감재에 30∼95 중량% 첨가하는데, 이는 고로슬래그분말이 30% 미만의 경우 석고 과다 사용으로 인한 과팽창 및 응결 지연이 되고 95 중량%를 초과하는 경우에는 팽창성이 결여됨으로서 장기간 사용시 균열이 발생한다.In the present invention, the blast furnace slag powder is added to the shrinkage reducing material 30 to 95% by weight, which is delayed overexpansion and condensation due to excessive use of gypsum when the blast furnace slag powder is less than 30% and expandable when it exceeds 95% by weight. This lack results in cracking over prolonged use.
본 발명에서 사용된 고로슬래그분말의 화학조성 및 성상은 표 2와 같다.The chemical composition and properties of the blast furnace slag powder used in the present invention are shown in Table 2.
본 발명에서는 분문건조-흡착방식(SDA방법)에 의해 생산된 건조된 석고분말에 고로슬래그분말을 적정 배합비로 배합하는데 동절기에는 응결시간이 너무 길어지므로 생석회(CaO)를 고로슬래그분말의 10∼50% 범위내에서 치환하여 사용하는 것이 좋다.In the present invention, the blast furnace slag powder is blended with the dry gypsum powder produced by powder drying-adsorption method (SDA method) at an appropriate blending ratio. It is good to substitute and use in% range.
이때 사용되는 생석회는 수화열이 높고 초기 팽창성을 갖고 있어 수축저감재로 유효하게 이용할 수 있는데, 본 발명에서는 이러한 팽창 특성을 기본으로 하면서 동절기 응결 조정 역할을 위해 사용된다.At this time, the quicklime used is high in the heat of hydration and has an initial expandability, so that it can be effectively used as a shrinkage reducing material. In the present invention, it is used for the coagulation adjustment role during the winter based on such expansion characteristics.
(3)콘크리트 조성물(3) concrete composition
본 발명의 콘크리트 조성물은Concrete composition of the present invention
(a) 시멘트 : 70∼85 중량%와(a) cement: 70-85 wt%
(b) 분무건조-흡착방식(SDA방법)의 석고 5∼70 중량%와 고로슬래그분말 30∼95중량%를 혼합하여 조성되는 수축저감재 15∼30 중량%를 배합한 원료에 조립률(F.M) 2.8이상의 모래 또는 50mm이내의 골재를 1:3내지 1:5로 조성한다.(b) Granulation rate (FM) in a raw material containing 15 to 30% by weight of shrinkage reducing material formed by mixing 5 to 70% by weight of gypsum and 30 to 95% by weight of blast furnace slag powder of the spray drying-adsorption method (SDA method). ) 2.8 or more sand or aggregates within 50mm are 1: 3 to 1: 5.
여기서 수축저감재는 시멘트에 15∼30 중량%의 배합비로 혼합하는 것이 바람직한데, 이는 15 중량% 미만의 경우 팽창에 의한 수축 보상 효과가 적으며, 30%를 초과하는 경우 과팽창 및 응결이 과도하게 지연될 수 있기 때문이다.In this case, the shrinkage reducing material is preferably mixed with cement in a mixing ratio of 15 to 30% by weight, which is less than 15% by weight of the shrinkage compensation effect due to expansion, and in excess of 30%, excessive expansion and condensation are excessive. This may be delayed.
또한, 수축저감재와 시멘트로 조성되는 원료와 골재의 배합비 못지 않게 중요한 것은 모래의 조립률을 2.8 이상으로 하는데, 이는 분말도를 높여 초기 균열을 방지하기 위해서이다.In addition, as important as the mixing ratio of raw materials and aggregates composed of shrinkage reducing materials and cement, the granulation rate of the sand is 2.8 or more, in order to increase the degree of powder to prevent initial cracking.
본 발명의 콘크리트조성물 배합시에는 펌프압송 및 마감미장공사를 원할히 하도록 통상의 방법대로 공기연행제, 감수제 및 증점제를 첨가할 수 있다.When the concrete composition of the present invention is blended, an air entrainer, a water reducing agent, and a thickener may be added in a conventional manner to facilitate pump pressure and finishing plastering.
이하, 본 발명을 실시예를 통하여 상세히 설명한다.Hereinafter, the present invention will be described in detail through examples.
[실시예 1]Example 1
분무건조-흡착방식의 석고, 고로슬래그분말, 생석회를 표3과 같이 배합한 수축저감재를 표4의 콘크리트 배합에 따라 혼합하고 배합에 따른 길이 변화율을 측정하여 도1에 나타내었다.Spray-drying-adsorption gypsum, blast furnace slag powder, and quicklime, the shrinkage reducing agent blended as shown in Table 3 was mixed according to the concrete mix of Table 4 and the length change rate according to the blend is measured and shown in FIG.
모래 조립률은 2.8로 하고 조골재 최대 치수는 40mm로 하였다.The sand granulation rate was 2.8 and the coarse aggregate maximum dimension was 40 mm.
또한 공시체의 길이 변화는 20℃, 95% RH의 항온 항습기에 넣어 24시간 양생한후, 탈형하여 길이 변화 측정기를 이용하여 초기 길이를 측정하였고, 측정후에는 다시 20℃, 60% RH의 항온 항습기에 넣어 소정의 측정재령에서 양생한후 측정하였다.In addition, the length of the specimen was cured for 24 hours in a constant temperature humidifier of 20 ℃, 95% RH, demolded to measure the initial length using a length change measuring instrument, and after the measurement again the constant temperature humidifier of 20 ℃, 60% RH It was measured after curing in a predetermined measuring age in the.
길이 변화는 도1에 나타난 바와 같이, 석고의 함량에 따라 팽창율이 높이 나타났고 생석회 첨가시에는 초기 팽창은 높이 나타났으나 장기 팽창은 저하됨을 알수 있었다.As shown in FIG. 1, the expansion rate was high according to the gypsum content, and the initial expansion was high when the quicklime was added, but the long-term expansion was lowered.
또한 상기 표3에 따른 수축저감재를 표4에 의거 소정의 측정재령에서 양생한후 압축강도를 측정하여 다음의 표5에 나타내었다.In addition, predetermined shrinkage reducing material according to Table 3 according to Table 4 After curing at the measuring age, the compressive strength was measured and shown in Table 5 below.
[실시예 2]Example 2
상기 실시예 표 3의 4번 수축저감재 조성에 따라 사방 10mm의 옥상 지붕판에 각각 보통콘크리트와 본 발명의 수축저감(팽창)콘크리트로 시공후 건조 수축에 의한 균열 발생 여부를 관찰하였다.Example 4 According to the shrinkage reducing material composition of Table 4, it was observed whether the cracks due to dry shrinkage after the construction of ordinary concrete and shrinkage reduction (expansion) concrete of the present invention on the roof plate of 10mm square each.
콘크리트 배합은 표 4에 따라 시행하였다.Concrete mix was performed according to Table 4.
양자 모두 24시간 경과후 초기 균열은 없었고, 장기 관찰결과 타설후 10개월까지는 양자 모두 균열 발생이 나타나지 않았으나 약 24개월 경과후 수축저감재 함유 콘크리트의 경우에는 균열 발생이 없었으나 일반콘크리트에서는 0.1∼0.3mm 균열폭으로 1m∼2m 정도 길이의 균열이 3∼4개 발생되었다.In both cases, there was no initial cracking after 24 hours, and long-term observation showed no cracking until 10 months after casting, but after about 24 months, there was no cracking in concrete containing shrinkage reducing material, but 0.1 ~ 0.3 in general concrete. Three to four cracks of about 1 m to 2 m in length were generated with the mm crack width.
따라서 본 발명의 수축저감재가 콘크리트에서 균열 억제 효과가 있는 것으로 확인되었다.Therefore, it was confirmed that the shrinkage reducing material of the present invention has a crack suppression effect in concrete.
상술한 바와 같이, 본 발명에서는 초기 균열이 발생하지 않음은 물론 장기 강도 발현율이 높고 시멘트도 절감되면서 콘크리트 균열방지에 탁월한 특성을 제공할 수 있는 유용한 효과가 있다.As described above, in the present invention, as well as the initial crack does not occur, the long-term strength expression rate is high and the cement is also reduced, there is a useful effect that can provide excellent properties in preventing concrete cracks.
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| KR19980030488A (en) * | 1996-10-30 | 1998-07-25 | 허동섭 | Cement Cracking Agent Composition |
| KR20010038156A (en) * | 1999-10-22 | 2001-05-15 | 황인태 | A compound for loess mortar or manufacturing method of compound for loess mortar |
| KR20010077653A (en) * | 2000-02-07 | 2001-08-20 | 손연자 | A cement admixture for concrete-making |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR19980030488A (en) * | 1996-10-30 | 1998-07-25 | 허동섭 | Cement Cracking Agent Composition |
| KR20010038156A (en) * | 1999-10-22 | 2001-05-15 | 황인태 | A compound for loess mortar or manufacturing method of compound for loess mortar |
| KR20010077653A (en) * | 2000-02-07 | 2001-08-20 | 손연자 | A cement admixture for concrete-making |
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