KR20040057212A - A Method of Neutralizing Surface of Concrete - Google Patents

A Method of Neutralizing Surface of Concrete Download PDF

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KR20040057212A
KR20040057212A KR1020020083820A KR20020083820A KR20040057212A KR 20040057212 A KR20040057212 A KR 20040057212A KR 1020020083820 A KR1020020083820 A KR 1020020083820A KR 20020083820 A KR20020083820 A KR 20020083820A KR 20040057212 A KR20040057212 A KR 20040057212A
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concrete
curing
carbon dioxide
neutralized
days
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KR1020020083820A
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Korean (ko)
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김형석
한기현
변태봉
배우현
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재단법인 포항산업과학연구원
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Priority to KR1020020083820A priority Critical patent/KR20040057212A/en
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/02Selection of the hardening environment
    • C04B40/0231Carbon dioxide hardening
    • C04B40/0236Carbon dioxide post-treatment of already hardened material

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

PURPOSE: Provided is a method for neutralizing the surface and the inside of concrete effectively in a short time by curing concrete in the air and then in CO2 atmosphere. The neutralized concrete is used for concrete structures of oceanic habitats. CONSTITUTION: The surface and the inside of concrete are neutralized by curing concrete within 5days and then curing the cured, not completely hardened, concrete in CO2 atmosphere for 6-24hrs, wherein the concentration of CO2 is less than 5%. The resultant concrete is neutralized to the depth of 6mm and the pH of liquid eluted from the surface of concrete is 8.5 or less.

Description

콘크리트 표면의 중성화방법{A Method of Neutralizing Surface of Concrete}A Method of Neutralizing Surface of Concrete

본 발명은 이산화탄소를 사용하여 콘크리트의 표면을 중성화하는 방법에 관한 것이며, 보다 상세하게는 특정한 양생시점에서 이산화탄소로 콘크리트 표면을 중성화하는 방법에 관한 것이다.The present invention relates to a method of neutralizing the surface of concrete using carbon dioxide, and more particularly to a method of neutralizing the concrete surface with carbon dioxide at a specific curing time.

콘크리트는 물, 시멘트 및 골재 3가지 물질로 구성되며, 이중에서 물과 시멘트가 혼합되어 생성된 페이스트(paste)가 골재와 골재 사이를 결합시키면서 단단한 구조체가 된다. 이때 사용되는 시멘트는 그 주성분이 CaO이며, 일반적으로 시멘트의 60%이상을 차지한다. 따라서, 시멘트를 바인더로 하는 콘크리트의 경우 상당기간 동안 칼슘 성분이 용출될 수 있으며, 이것이 알칼리성 용출수의 발생 원인이 된다. 즉, 콘크리트가 중성화되기 전까지는 계속적으로 알칼리성 용출수가 발생될 것이다.Concrete is composed of three materials, water, cement and aggregate, in which a paste formed by mixing water and cement becomes a rigid structure while bonding between aggregate and aggregate. At this time, the main component of the cement is CaO, and generally takes up more than 60% of the cement. Therefore, in the case of concrete having cement as a binder, calcium components can be eluted for a considerable period of time, which causes alkaline elution water. That is, alkaline effluent will continue to be produced until the concrete is neutralized.

이러한, 콘크리트 구조물이 해수중에 시설되면 콘크리트 구조물에서는 알칼리성 용출수가 발생한다. 또한, 구조물 표면에는 매우 국부적이지만 강알칼리성의 박막이 형성되어 일정 기간 동안 해양 생물이 서식하기에는 부적합하게 된다.When the concrete structure is installed in seawater, alkaline elution water is generated in the concrete structure. In addition, very local but strongly alkaline thin films are formed on the surface of the structure, making them inadequate for marine life for a period of time.

콘크리트 구조물을 소파제나 인공어초, 해중림초와 같이 생물 서식 환경 조성에 사용하기 위해서는 그 표면의 pH가 약알칼리성 혹은 중성인 것이 바람직하며, 특히 해조류나 시설물에 부착하여 서식하는 동물류에 있어서는 더욱 그러하다. 따라서, 콘크리트의 표면을 중성화처리하는 방법이 요구된다.In order to use the concrete structure in the biological habitat environment, such as sofa bed, artificial reefs, and seaweeds, the pH of the surface is preferably weakly alkaline or neutral, especially for animals inhabiting by attaching to seaweeds or facilities. Therefore, there is a need for a method of neutralizing the surface of concrete.

종래 콘크리트 구조체 표면 주변에서 생성되는 알칼리성 용출수의 생성을 방지하기 위한 방법으로는 일본 특개평 6-106195에 슬러지 고화체를 해수 중에 상당 시간 담궈두거나 황산수용액과 같은 산성용액에 침지하거나, 탄산가스와 반응시키는 방법 등을 개시되어 있다.Conventional methods for preventing the formation of alkaline effluent water around the surface of concrete structures include immersing sludge solids in seawater for a considerable time in Japanese Patent Laid-Open No. 6-106195, immersing them in acidic solutions such as sulfuric acid solution, or reacting with carbon dioxide gas. And the like are disclosed.

이에 본 발명의 목적은 콘크리트 표면을 효과적으로 중성화하는 방법을 제공하는 것이다.It is therefore an object of the present invention to provide a method for effectively neutralizing a concrete surface.

본 발명의 또 다른 목적은 콘크리트 표면으로부터 특정한 깊이 까지를 단시간 내에 효과적으로 중성화하는 방법을 제공하는 것이다.Another object of the present invention is to provide a method for effectively neutralizing in a short time from the concrete surface to a certain depth.

본 발명에 의하면,According to the invention,

콘크리트 양생시, 콘크리트를 5일 이내의 기간동안 양생한 후, 이산화탄소 분위기에서 6-24시간동안 양생하여 콘크리트 표면을 중성화하는 방법이 제공된다.When curing concrete, a method of curing concrete for less than 5 days and then curing for 6-24 hours in a carbon dioxide atmosphere is provided to neutralize the concrete surface.

이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

콘크리트는 이산화탄소로 처리함으로써 중성화된다. 즉, 경화된 콘크리트에서는 시멘트의 수화생성물인 수산화칼슘이 유리 용출되어, 알칼리성을 나타낸다. 이러한 콘크리트 표면중의 수산화칼슘은 이산화탄소등과 반응하여 탄산칼슘이 되며, 따라서, 알칼리성인 콘크리트 표면이 중성화된다.Concrete is neutralized by treatment with carbon dioxide. That is, in the hardened concrete, calcium hydroxide, which is a hydration product of cement, is eluted out of glass and exhibits alkalinity. Calcium hydroxide in the concrete surface reacts with carbon dioxide and the like to become calcium carbonate, thus neutralizing the concrete concrete surface.

그러나, 콘크리트 제조도중, 콘크리트를 약 30일간 완전히 양생한 후에 이산화탄소로 처리하게 되면, 시멘트가 완전히 고화되어 콘크리트내의 기공이 작아지고 기공을 통한 이산화탄소의 침투가 어렵게 된다. 따라서, 이산화탄소가 콘크리트 내부까지 침투하지 못하며, 콘크리트 표면으로부터 충분한 깊이에 이르기 까지 중성화되지 못한다.However, during concrete manufacturing, if the concrete is completely cured for about 30 days and then treated with carbon dioxide, the cement is completely solidified and the pores in the concrete become smaller and the penetration of carbon dioxide through the pores becomes difficult. Thus, carbon dioxide does not penetrate into the concrete and does not neutralize to a sufficient depth from the concrete surface.

따라서, 본 발명에서는 콘크리트의 표면 및 표면으로부터 충분한 깊이에 이르기까지 중성화처리되도록 콘크리트 제조과정도중 양생시, 5일 이내의 기간동안양생한 후, 이산화탄소 분위기에서 양생함으로써 콘크리트 표면으로부터 일정한 깊이까지 중성화되도록 한다.Therefore, in the present invention, during curing during the manufacturing process of the concrete to be neutralized to a sufficient depth from the surface and the surface of the concrete, after curing for a period within 5 days, by curing in a carbon dioxide atmosphere to be neutralized to a certain depth from the concrete surface. .

이산화탄소 분위기하에서는 약 6-24시간 동안 양생한다. 이산화탄소 분위기하에서 6시간미만으로 양생하면 충분히 중성화되지 못하며, 24시간을 초과하더라도 더 이상의 중성화 증대 효과가 미약하기 때문이다.In a carbon dioxide atmosphere, it cure for about 6-24 hours. Curing in less than 6 hours in a carbon dioxide atmosphere is not sufficiently neutralized, even if more than 24 hours, the effect of increasing the neutralization is weak.

이산화탄소는 그 농도가 5중량%이상인 이산화탄소 분위기하에서 양생하는 것이 바람직하다. 이산화탄소의 농도가 클수록 중성화처리 시간이 단축될 수 있으나, 농도가 5중량%미만인 경우에는 충분한 중성화처리 효과를 나타내지 못한다.Carbon dioxide is preferably cured in a carbon dioxide atmosphere whose concentration is 5% by weight or more. The greater the concentration of carbon dioxide, the shorter the neutralization time, but if the concentration is less than 5% by weight does not exhibit sufficient neutralization effect.

이산화탄소 분위기에서 양생하기전에 통상적으로 5일 이내로 기간동안 양생한다. 5일을 초과하여 양생한 후, 이산화탄소로 처리하는 경우에는 시멘트의 고화가 상당히 진행되어 이산화탄소 분위기중에서 양생하더라도 중성화되는 깊이가 감소되기 때문이다.Before curing in a carbon dioxide atmosphere, it is usually cured for a period of less than 5 days. After curing for more than 5 days, when treated with carbon dioxide, the solidification of the cement proceeds considerably, even if curing in a carbon dioxide atmosphere, the depth of neutralization is reduced.

이산화탄소 분위기하에서 양생하기전의 통상적인 양생기간이 짧을수록 중성화처리시, 중성화되는 깊이는 깊으나, 약 5일 이내의 기간동안 양생한 후, 이산화탄소 분위기하에서 양생함으로써 콘크리트 표면으로 부터 약 6mm 깊이에 해당하는 부분까지 중성화되며, 중화처리된 콘크리트 표면으로 부터의 용출수의 pH는 8.5이하로, 이는 해양수질기준 pH를 충족하는 것이다.The shorter the normal curing period before curing in the carbon dioxide atmosphere, the deeper the neutralization depth during the neutralization treatment, but curing for less than about 5 days, and curing in the carbon dioxide atmosphere, corresponding to a depth of about 6mm from the concrete surface. The pH of the effluent from the neutralized concrete surface is less than or equal to 8.5, which is neutral to the part, which meets the ocean water quality standard pH.

이산화탄소 분위기에서 양생한 후, 다시 충분한 강도를 나타낼 때가지 일반적인 양생을 행한다.After curing in a carbon dioxide atmosphere, general curing is performed until sufficient strength is achieved again.

상기 본 발명의 방법으로 중성화처리된 콘크리트는 콘크리트를 수중에 적용하는 경우에 특히 사용하기 적합하며, 소파제나 인공어초, 해죽림초 및 해조초와 같이 생물 서식 환경 조성에 사용될 수 있다.The concrete neutralized by the method of the present invention is particularly suitable for use when the concrete is applied in water, and may be used in the biological habitat environment composition such as sofa bed, artificial reefs, seaweeds and seaweeds.

이하, 실시예를 통하여 본 발명에 대하여 상세히 설명한다.Hereinafter, the present invention will be described in detail through examples.

실시예Example

실시예 1Example 1

하기 표 1에 나타낸 성분을 기재한 함량으로 배합하여 시편을 제작하였다.To prepare a specimen by combining the components shown in Table 1 to the content described.

굵은 골재로는 입도 5∼25mm의 골재를 세골재로는 주문진 표준사를 사용하였다. 시편으로는 10 X 20cm 원주형 공시체를 제작하여 사용하였다.As a coarse aggregate, aggregates of 5-25 mm in particle size were used, and Jugjin standard yarn was used as fine aggregate. As a specimen, a 10 × 20 cm cylindrical specimen was prepared and used.

양생 방법은 23oC, 상대습도 65% 조건에서 시편을 각각 1, 2, 3, 4, 5, 6, 7, 28일간 양생한 후, 온도 40oC, 상대습도 65%, CO2농도 5%의 환경하에서 24시간동안 양생시켜 중성화하였다. 그 후, 총 양생기간이 28일이 되도록 나머지 기간을 23oC, 상대습도 65% 조건에서 양생하였다.The curing method is to cure the specimens at 23 o C and 65% RH for 1, 2, 3, 4, 5, 6, 7, 28 days, and then at 40 o C, 65% RH, and CO 2 concentration 5 Cured and neutralized for 24 hours in% environment. After that, the remaining period was cured at 23 ° C. and 65% RH so that the total curing period was 28 days.

중성화 깊이 측정은 할렬 후 페놀프탈레인 용액을 분무하여 변색으로 판단하였으며 결과를 하기 표 2에 나타내었다.Neutralization depth measurement was determined by discoloration by spraying the phenolphthalein solution after the cleavage and the results are shown in Table 2 below.

[표 1]TABLE 1

콘크리트 배합 (1m3기준)Concrete mix (based on 1m 3 )

물/시멘트비(%)Water / cement ratio (%) 물(Kg)Water (Kg) 시멘트량(Kg)Cement amount (Kg) 세골재량(Kg)Fine Aggregate (Kg) 조골재량(Kg)Coarse aggregate (Kg) 5656 195195 348348 715715 10181018

[표 2]TABLE 2

양생재령별 중성화 깊이Neutralization Depth by Curing Age

양생일수(일)Curing days (days) 중성화 깊이(mm)Neutralization Depth (mm) 123456728123456728 8887643288876432

상기 표 2에 나타낸 바와 같이 이산화탄소 처리전의 양생일수가 5일을 초과하는 경우에는 동일한 조건으로 처리시 중성화되는 깊이가 충분하지 못하였다.As shown in Table 2, when the curing days before carbon dioxide treatment exceeded 5 days, the depth to be neutralized under the same conditions was not sufficient.

실시예 2Example 2

실시예 1에서와 같이 초기 양생 기간별로 양생되어진 시편을 상기 실시예 1과 동일한 조건하에서 이산화탄소하에서 중성화한 후, 각 시편을 해수(pH=8.2)속에 장입하였다. 24시간 경과후 해수의 pH를 측정하여 하기 표 3에 나타내었다. 사용한 해수와 콘크리트 시편의 비율은 해수 부피(리터) : 시편무게(Kg)= 10:1 로 하였다.As in Example 1, the specimens cured for each initial curing period were neutralized under carbon dioxide under the same conditions as in Example 1, and then each specimen was charged into seawater (pH = 8.2). After 24 hours, the pH of seawater was measured and shown in Table 3 below. The ratio of seawater and concrete specimens used was seawater volume (liters): specimen weight (Kg) = 10: 1.

[표 3]TABLE 3

양생일수(일)Curing days (days) 중성화 깊이(mm)Neutralization Depth (mm) 용출 해수의 pHPH of eluted seawater 123456728123456728 8887643288876432 8.68.78.78.98.99.29.69.68.68.78.78.98.99.29.69.6

상기 표 3에서 알 수 있듯이, 이산화탄소 처리전의 양생일수가 5일을 초과한 시편의 경우 용출수의 pH가 9이상으로 알칼리성을 나타내었으며, 이로부터 중성화가 충분하지 않았다.As can be seen in Table 3, in the case of the specimen that the curing days before the carbon dioxide treatment is more than 5 days, the pH of the elution water showed an alkalinity of 9 or more, from which neutralization was not sufficient.

본 발명의 방법으로 콘크리트 표면을 중화하는 경우 콘크리트 내부까지 단시간내에 효과적으로 중성화되며, 중성화처리된 콘크리트 용출수의 pH는 해양 수질 기준치를 만족한다.When neutralizing the concrete surface by the method of the present invention is effectively neutralized in a short time to the interior of the concrete, the pH of the neutralized concrete leaching water satisfies the marine water quality standards.

Claims (2)

콘크리트 양생시, 콘크리트를 5일이내 기간동안 양생한 후, 이산화탄소 분위기에서 6-24시간동안 양생하는 콘크리트 표면의 중성화 방법.In the case of concrete curing, the concrete surface is cured for less than 5 days, and then neutralized for 6-24 hours in a carbon dioxide atmosphere. 제 1항에 있어서, 콘크리트 표면으로부터 6mm 깊이까지 중화됨을 특징으로 하는 콘크리트 표면의 중성화 방법.The method of claim 1 wherein the concrete surface is neutralized to a depth of 6 mm from the concrete surface.
KR1020020083820A 2002-12-26 2002-12-26 A Method of Neutralizing Surface of Concrete KR20040057212A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101006829B1 (en) * 2008-10-10 2011-01-12 (주)대우건설 A Testing Method of High Speedy Carbonation of Concrete
KR20150018287A (en) * 2013-08-09 2015-02-23 한양대학교 에리카산학협력단 Concrete structure for arrest alkali ions leaching from concrete, surface treatment apparatus and method for concrete
KR20220097663A (en) * 2020-12-30 2022-07-08 한국석회석신소재연구재단 Manufacturing Method of Calcium Silicated Base Cement Clinker And Calcium Silicated Base Cement Clinker Hardening Body

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101006829B1 (en) * 2008-10-10 2011-01-12 (주)대우건설 A Testing Method of High Speedy Carbonation of Concrete
KR20150018287A (en) * 2013-08-09 2015-02-23 한양대학교 에리카산학협력단 Concrete structure for arrest alkali ions leaching from concrete, surface treatment apparatus and method for concrete
KR20220097663A (en) * 2020-12-30 2022-07-08 한국석회석신소재연구재단 Manufacturing Method of Calcium Silicated Base Cement Clinker And Calcium Silicated Base Cement Clinker Hardening Body

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