KR20000007185A - Lightweight aerated concrete composition containing fly ash and preparation method thereof - Google Patents

Lightweight aerated concrete composition containing fly ash and preparation method thereof Download PDF

Info

Publication number
KR20000007185A
KR20000007185A KR1019980026382A KR19980026382A KR20000007185A KR 20000007185 A KR20000007185 A KR 20000007185A KR 1019980026382 A KR1019980026382 A KR 1019980026382A KR 19980026382 A KR19980026382 A KR 19980026382A KR 20000007185 A KR20000007185 A KR 20000007185A
Authority
KR
South Korea
Prior art keywords
foaming agent
fly ash
cement
concrete composition
water
Prior art date
Application number
KR1019980026382A
Other languages
Korean (ko)
Inventor
최응규
Original Assignee
김헌출
삼성물산 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 김헌출, 삼성물산 주식회사 filed Critical 김헌출
Priority to KR1019980026382A priority Critical patent/KR20000007185A/en
Publication of KR20000007185A publication Critical patent/KR20000007185A/en

Links

Classifications

    • 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
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
    • 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
    • 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
    • C04B28/04—Portland cements
    • 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
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
    • 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
    • C04B2103/40—Surface-active agents, dispersants
    • 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
    • C04B2111/40—Porous or lightweight 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

Abstract

PURPOSE: A lightweight aerated concrete composition and a preparation method thereof are provided, which has a good insulating property, the reduced frequency of crack generation due to the drying shrinkage and the improved compression strength and long-term strength. CONSTITUTION: The lightweight aerated concrete composition is prepared by adding water to a foaming agent to make a diluted solution; injecting the diluted solution into a foam generation machine to generate foam; mixing cement and fly ash (main components:SiO2, Al2O3, Fe2O3, and K, P, B, Co, Mo, Mg) in a ratio of 2:1 to 8:1 and water to make a cement paste; and mixing the foam in a range of 50-80 percent by volume with the cement paste and stirring it. The foaming agent is one selected from an animal foaming agent and a surfactant-type foaming agent.

Description

플라이 애쉬를 혼입한 경량 기포콘크리트 조성물 및 그 제조방법. (A composition for aerated lightweight concrete adding fly ash and the method for producing the same)Light-weight foamed concrete composition incorporating fly ash, and a method of manufacturing the same. (A composition for aerated lightweight concrete adding fly ash and the method for producing the same)

본 발명은 플라이 애쉬를 혼입한 경량 기포콘크리트 조성물 및 그 제조방법에 관한 것이다. 보다 구체적으로, 화력발전소 또는 제지회사 등에서 생성되는 플라이 애쉬를 포틀랜드 시멘트 및 물과 일정 비율로 배합하여 시멘트 페이스트를 제조하고, 여기에 기포제를 기포발생장치에 투입하여 발생한 기포를 혼입하여, 단열성능이 우수하고, 건조수축에 의한 균열발생이 적으며, 압축강도가 개선된 경량 기포콘크리트 조성물에 관한 것이다.The present invention relates to a lightweight foamed concrete composition incorporating a fly ash and a method of manufacturing the same. More specifically, fly ash produced in a thermal power plant or a paper company, etc. is blended with Portland cement and water in a proportion to produce a cement paste, and by adding a foaming agent to the bubble generator, the foam generated is mixed to provide thermal insulation performance. The present invention relates to a lightweight foamed concrete composition which is excellent, has little cracking caused by dry shrinkage, and has improved compressive strength.

경량 기포콘크리트는 슬러리 상태의 시멘트 혼합물에 기포구조를 만들기 위해 무기 발포제 및 기체발생 계면활성제를 도입함으로써 콘크리트 내부에 기포를 형성시키는 것을 말한다.Lightweight foam concrete refers to the formation of bubbles in concrete by introducing an inorganic blowing agent and a gas generating surfactant to form a bubble structure in the cement mixture in the slurry state.

경량 기포콘크리트는 제조하는 방법에 따라 폼 콘크리트(Foamed Concrete)와 가스 콘크리트(Gas Concrete)로 구분된다.Lightweight foam concrete is classified into foamed concrete and gas concrete according to the manufacturing method.

폼 콘크리트는 아직 굳지 않은 콘크리트에 기포제의 물리적 계면활성 작용에 의해 얻어진 기포를 콘크리트 중에 혼합하는 방법으로써 기포제조와 도입순서에 따라 기포발생 계면활성제를 교반하여 미리 기포를 만들어 두고 시멘트 페이스트나 모르타르에 혼입하는 프리폼법(Pre Foaming)과 시멘트 페이스트 또는 모르타르의 제조시에 기포제를 첨가하여 반죽하는 중에 기포를 생성시키는 믹스폼법(Mix Foaming)으로 구분할 수 있다.Foam concrete is a method of mixing the bubbles obtained by the physical surface action of the foaming agent in the concrete, which is not yet hardened, into the concrete. The foaming surfactant is stirred in advance according to the manufacturing and introduction order of the foam, and the foam is mixed in the cement paste or mortar. It can be divided into the pre-forming method (Pre Foaming) and the mixing foam method (Mix Foaming) to generate bubbles during kneading by adding a foaming agent in the production of cement paste or mortar.

가스 콘크리트는 아직 굳지 않은 콘크리트에 발포제의 화학반응을 통하여 얻어진 기포를 콘크리트 중에 포함시키는 방법으로 응결했을 때 다량의 기체방울이 포함된다. 발포제로는 미분화된 알루미늄 분말이 가장 많이 사용되며 발포원리는 활성분말이 수산화칼슘 또는 알칼리 유리수소와 수화 반응하여 수소를 발생시키는 원리이다.Gas concrete contains a large amount of gas bubbles when it is condensed by incorporating the bubbles obtained through the chemical reaction of the blowing agent into the concrete that is not yet hardened. As the blowing agent, finely divided aluminum powder is most used, and the blowing principle is a principle of generating hydrogen by hydrating the active powder with calcium hydroxide or alkali free hydrogen.

경량 기포콘크리트 조성물은 열전도율이 낮은 재료로써 단열성능이 뛰어나 건물의 열 효율성을 향상시켜 에너지 절약효과를 얻을 수 있고, 흡음 성능도 우수하여 쾌적한 실내환경을 조성할 수 있다. 이러한 장점 때문에 경량 기포콘크리트는 주로 공동주택의 온수온돌 바닥구조 또는 옥상층의 단열층 등에 많이 사용되고 있다. 그 외에도 비중이 작아 터널 배면의 충전, 건축물 기초 배면의 충전 등에도 이용되고 있다.The lightweight foamed concrete composition is a material having low thermal conductivity, which is excellent in thermal insulation performance, thereby improving energy efficiency of buildings, resulting in energy saving effect, and excellent sound absorption performance, thereby creating a comfortable indoor environment. Because of these advantages, lightweight foam concrete is mainly used for hot water ondol floor structure of a multi-family house or insulation layer of the rooftop. In addition, the specific gravity is small, and is used for filling the back of tunnels and the back of building foundations.

경량 기포콘크리트 조성물을 제조하기 위하여 종래에는 시멘트 페이스트 또는 시멘트 모르타르에 기포제에 의해 발포된 기포를 첨가하거나, 또는 폴을 첨가하는 방법 등을 사용하였다.In order to manufacture a lightweight foamed concrete composition, a method in which foamed foamed by a foaming agent is added to a cement paste or cement mortar or a pole is added.

시멘트 페이스트 또는 시멘트 모르타르에 기포제에 의해 교반된 기포를 첨가한 경량 기포콘크리트 조성물은 소요 시공성을 확보하기 위해 물-시멘트 비를 증가시킴으로써 압축강도가 저하하며, 단위수량이 많아 균열발생이 크고, 기계조작 기능공의 기술력 차이에 의해 품질편차가 크며, 배합설계보다 과다한 시멘트가 소요되는 등의 문제가 있다.The lightweight foamed concrete composition, in which cement foam or cement mortar is added with air bubbles stirred by foaming agent, decreases compressive strength by increasing water-cement ratio in order to secure required workability. There is a problem that the quality deviation is large due to the technical skill difference of the skilled workers, and that excessive cement is required than the compounding design.

또한 폴을 첨가한 경량 기포콘크리트 조성물은 비중 차에 의해 폴이 위로 떠올라 마감 면이 고르지 못하고, 상부층 압송시 재료분리 현상이 발생하며, 작업시 폴의 비산으로 작업현장이 지저분해지고, 기포콘크리트 판상의 오그라짐, 들뜸 등이 발생하며, 배합설계보다 과다한 시멘트가 소요되고, 압축강도가 저하하는 등의 문제가 있다.In addition, the lightweight foamed concrete composition with poles has a pole that rises due to the difference in specific gravity, so that the finishing surface is uneven, material separation occurs when the upper layer is conveyed, and the work site becomes messy due to the scattering of the poles during work, There is a problem such as misalignment, lifting and the like, excessive cement is required than the compounding design, and the compressive strength is lowered.

따라서, 상기와 같은 문제점을 해결하기 위하여 시멘트 페이스트에 플라이 애쉬를 혼입하여 균열발생을 줄이고, 압축강도가 개선되고 상부 모르타르층과의 부착력이 강화된 경량 기포콘크리트 조성물을 개발하게 되었다.Therefore, in order to solve the above problems, incorporating fly ash into the cement paste reduces the occurrence of cracking, and has developed a lightweight foamed concrete composition having improved compressive strength and enhanced adhesion to the upper mortar layer.

본 발명의 목적은 건조수축에 의한 균열발생을 감소시킨 경량 기포콘크리트 조성물 및 그 제조방법을 제공하는 것이다.It is an object of the present invention to provide a lightweight foamed concrete composition and a method for producing the same, which reduces the occurrence of cracks caused by dry shrinkage.

본 발명의 다른 목적은 단열성능 및 압축강도가 양호한 경량 기포콘크리트 조성물 및 그 제조방법을 제공하는 것이다.Another object of the present invention is to provide a lightweight foamed concrete composition and a method of manufacturing the same having good thermal insulation performance and compressive strength.

본 발명의 또 다른 목적은 시멘트의 일부를 플라이 애쉬로 대체하여 경제성이 우수한 경량 기포콘크리트 조성물 및 그 제조방법을 제공하는 것이다.Another object of the present invention is to replace a portion of the cement with fly ash to provide a lightweight foamed concrete composition excellent in economic efficiency and a method of manufacturing the same.

본 발명은 시멘트와 물로 구성되는 시멘트 페이스트에 혼화재로서 플라이 애쉬를 첨가하고, 여기에 다시 기포제를 발포시켜 얻어진 기포를 첨가한 경량 기포콘크리트 조성물에 관한 것이다.The present invention relates to a lightweight foamed concrete composition in which a fly ash is added as a mixed material to a cement paste composed of cement and water, and a bubble obtained by foaming a foaming agent is added thereto.

플라이 애쉬란 화력발전소 또는 제지회사 등에서 비분탄을 약 1,400 내지 1,500℃의 고온으로 소각시켰을 때 발생하는 연소 보일러의 연도 가스로부터 전기식 및 기계식 집진장치를 이용하여 포집한 것이다. 플라이 애쉬는 화산재와 물성이 유사한 물질로서 매우 미세한 분말상태이며 주성분은 규사이고 입자모양은 구형이며, 천연 포졸란(Pozzolan)과 같은 특성을 가지므로 인공 포졸란 또는 인공 화산재라고도 한다. 플라이 애쉬는 그 자체로써는 수경성이 없으나 실리카 성분이 석회와 시멘트의 수화 생성물인 수산화 칼슘과 상온에서 서서히 반응을 일으켜 안정된 수용성화합물을 생성하여 경화하는 성질을 가지고 있다. 주성분으로서는 SiO2, Al2O3, Fe2O3등이며, 미량의 K, P, B, Co, Mo, Mg등이 함유되어 있다.Fly ash is collected by using electric and mechanical dust collectors from flue gas of a combustion boiler generated when incineration of non-powdered coal at a high temperature of about 1,400 to 1,500 ° C in a thermal power plant or a paper company. Fly ash is a material similar to volcanic ash. It is also called artificial pozzolanic or artificial volcanic ash because it has very fine powder state, its main ingredient is silica sand, and its spherical shape is spherical and has the same characteristics as natural pozzolan. Fly ash is not hydrophobic in itself, but has a property that silica component reacts slowly with calcium hydroxide, which is a hydration product of lime and cement, at room temperature to produce stable water-soluble compound to cure. As the main component and SiO 2, such as Al 2 O 3, Fe 2 O 3, it is contained in a small amount of K, P, B, Co, Mo, Mg and the like.

플라이 애쉬가 콘크리트 중에서 일으키는 화학반응은 다음과 같다.The chemical reactions of fly ash in concrete are:

CaO + H2O → Ca(OH)2 CaO + H 2 O → Ca (OH) 2

3Ca(OH)2+ 2SiO2→ 3CaO·2SiO2·3H2O3Ca (OH) 2 + 2SiO 2 → 3CaO · 2SiO 2 · 3H 2 O

시멘트 중의 CaO는 물과 반응하여 소석회(Ca(OH)2)를 만들며, 상기 소석회는 불안정한 상태이다. 그러나, 상기 소석회는 실리카(SiO2)와 결합하여 애플라이트(Applite)를 생성하여 안정된 상태를 이루게 된다.CaO in cement reacts with water to form hydrated lime (Ca (OH) 2 ), which is unstable. However, the slaked lime is combined with silica (SiO 2 ) to form an appleite (Applite) to achieve a stable state.

기포는 액체 속에서 기체입자가 분산되어 있는 입자 콜로이드의 일종이다. 기포제에 의해 기포콘크리트 조성물을 제조하는 방법은 기포를 발생시키는 계면활성기포제의 계면활성 작용을 이용하여 물리적으로 기포를 도입시킨 것으로, 기포제의 종류나 희석비율 또는 발포배율에 따라 공기량이 20%에서 최고 85%에 이른다. 일반 콘크리트용 AE제도 첨가량을 증가시키면 기포제로 사용할 수 있지만, 콘크리트의 점성이 크게 되어 유동성이 저하하기 때문에 기포성이 높고 다량 사용하여도 시멘트의 응결 및 경화에 영향을 미치지 않고 유동성이 좋으며 콘크리트의 초결 및 종결까지 기포를 안정하게 유지하는 기포제를 사용 목적이나 조건에 부합하도록 선택해서 사용할 필요가 있다. 현재 국내에서 생산되고 있는 기포제는 동물성 기포제, 식물성 기포제 및 계면 활성제계 기포제의 세 가지로 크게 구분할 수 있다. 이중 실제 현장에서 가장 많이 사용하고 있는 기포제는 동물성 기포제 및 계면활성제계 기포제이다.Bubbles are a type of colloidal particle in which gas particles are dispersed in a liquid. The method for preparing the foamed concrete composition by the foaming agent is to introduce the foam physically by using the surface-active action of the foaming surface-active agent, and the air volume is the highest at 20% depending on the type of foaming agent, the dilution ratio or the foaming ratio. Up to 85%. AE can also be used as a foaming agent by increasing the added amount of general concrete.Because the viscosity of concrete increases, the fluidity decreases, so the foaming is high. It is necessary to select and use a foaming agent that keeps the bubble stable until the end in accordance with the purpose or conditions of use. Currently, domestically produced foaming agents can be broadly classified into three types: animal foaming agents, vegetable foaming agents, and surfactant-based foaming agents. Among the most commonly used foaming agents in the field are animal foaming agents and surfactant-based foaming agents.

본 발명의 경량 기포콘크리트 조성물을 제조하는 방법을 기술한다. 먼저 기포제와 물을 혼합한 희석액을 기포발생장치에 투입하여 기포를 발생시킨다. 다음 시멘트와 플라이 애쉬를 중량비로 2 내지 8 대 1의 비율로 혼합하고, 여기에 물을 가하여 시멘트 페이스트를 제조한다. 상기 기포를 상기 시멘트 페이스트에 혼합하고 교반하여 본 발명의 경량 기포콘크리트 조성물을 제조한다.The method for producing the lightweight foamed concrete composition of the present invention is described. First, a diluent mixed with a foaming agent and water is introduced into a bubble generator to generate bubbles. Next, cement and fly ash are mixed in a ratio of 2 to 8 to 1 by weight, and water is added thereto to prepare a cement paste. The foam is mixed with the cement paste and stirred to prepare a lightweight foamed concrete composition of the present invention.

본 발명은 하기의 실시예에 의해 보다 구체화될 것이며, 하기의 실시예는 본 발명을 예시하기 위한 것으로, 본 발명의 보호범위를 제한하고자 하는 것은 아니다.The present invention will be further illustrated by the following examples, which are intended to illustrate the present invention and are not intended to limit the protection scope of the present invention.

<실시예 1><Example 1>

시멘트 240㎏과 플라이 애쉬 40㎏을 160㎏의 물과 혼합, 교반하여 시멘트 페이스트를 제조하고, 기포제를 발포시켜 기포를 콘크리트 용적의 78%가 되도록 상기 시멘트 페이스트에 혼합하였다.240 kg of cement and 40 kg of fly ash were mixed and stirred with 160 kg of water to prepare a cement paste, and the foaming agent was foamed to mix the bubbles with the cement paste so as to be 78% of the concrete volume.

기포제는 비중 1.12의 동물성 단백질계 기포제를 중량비로 25배 희석하여 사용하였으며, 시멘트는 보통 포틀랜드 시멘트로 비중 3.15, 분말도 3,150㎠/g인 것을 사용하였고, 물은 상수도수를 사용하였다. 플라이 애쉬는 비중 2.17의 보령산 유연탄계를 사용하였고, 그 화학적 성분은 표 1과 같다.The foaming agent was used by diluting the animal protein foaming agent having a specific gravity of 1.12 by 25 times by weight ratio. The cement was generally used as a portland cement having a specific gravity of 3.15 and a powder of 3,150 cm 2 / g, and water was used as tap water. Fly ash used Boryeong acid bituminous coal system with a specific gravity of 2.17, the chemical composition is shown in Table 1.

SiO2 SiO 2 Al2O3 Al 2 O 3 Na2ONa 2 O MgOMgO SO3 SO 3 Fe2O3 Fe 2 O 3 습분Moisture 강열감량Ignition loss 분말도Powder 55.155.1 25.825.8 0.80.8 1.11.1 0.30.3 3.73.7 0.10.1 3.53.5 4,0504,050

<실시예 2><Example 2>

플라이 애쉬를 80㎏, 물을 169㎏, 기포율을 75%로 하였고, 다른 조건은 실시예 1의 경우와 동일하다.The fly ash was 80 kg, the water was 169 kg, and the bubble ratio was 75%. The other conditions were the same as those in Example 1.

<실시예 3><Example 3>

시멘트를 280㎏, 플라이 애쉬를 40㎏, 물을 184㎏, 기포율을 75%로 하였고, 다른 조건은 실시예 1의 경우와 동일하다.280 kg of cement, 40 kg of fly ash, 184 kg of water, and a foaming ratio of 75% were used. The other conditions were the same as those in Example 1.

<실시예 4><Example 4>

플라이 애쉬를 80㎏, 물을 188㎏, 기포율을 72%로 하였고, 다른 조건은 실시예 3의 경우와 동일하다.The fly ash was 80 kg, the water was 188 kg, and the bubble ratio was 72%. The other conditions were the same as in Example 3.

<실시예 5>Example 5

플라이 애쉬를 120㎏, 물을 193㎏, 기포율을 70%로 하였고, 다른 조건은 실시예 3의 경우와 동일하다.The fly ash was 120 kg, the water was 193 kg, and the bubble ratio was 70%. The other conditions were the same as those in Example 3.

<실시예 6><Example 6>

시멘트를 320㎏, 플라이 애쉬를 40㎏, 물을 202㎏, 기포율을 71%로 하였고, 다른 조건은 실시예 1의 경우와 동일하다.320 kg of cement, 40 kg of fly ash, 202 kg of water, and a foaming ratio of 71% were used. The other conditions were the same as those in Example 1.

<실시예 7><Example 7>

플라이 애쉬를 80㎏, 물을 207㎏, 기포율을 69%로 하였고, 다른 조건은 실시예 6의 경우와 동일하다.The fly ash was 80 kg, the water was 207 kg, and the bubble ratio was 69%. The other conditions were the same as those in Example 6.

<실시예 8><Example 8>

플라이 애쉬를 120㎏, 물을 221㎏, 기포율을 74%로 하였고, 다른 조건은 실시예 6의 경우와 동일하다.The fly ash was 120 kg, the water was 221 kg, and the bubble ratio was 74%. The other conditions were the same as those in Example 6.

<실시예 9>Example 9

시멘트를 400㎏, 플라이 애쉬를 80㎏, 물을 243㎏, 기포율을 62%로 하였고, 다른 조건은 실시예 1의 경우와 동일하다.400 kg of cement, 80 kg of fly ash, 243 kg of water and 62% bubble ratio were used. The other conditions were the same as those in Example 1.

<실시예 10><Example 10>

플라이 애쉬를 160㎏, 물을 243㎏, 기포율을 57%로 하였고, 다른 조건은 실시예 9의 경우와 동일하다.160 kg of fly ash, 243 kg of water, and the bubble ratio was 57%, and the other conditions are the same as that of Example 9.

<실시예 11><Example 11>

시멘트를 500㎏, 플라이 애쉬를 80㎏, 물을 289㎏, 기포율을 54%로 하였고, 다른 조건은 실시예 1의 경우와 동일하다.500 kg of cement, 80 kg of fly ash, 289 kg of water, and bubble ratio were 54%, and the other conditions were the same as those of Example 1.

<실시예 12><Example 12>

플라이 애쉬를 160㎏, 물을 299㎏, 기포율을 49%로 하였고, 다른 조건은 실시예 11의 경우와 동일하다.The fly ash was 160 kg, the water was 299 kg, and the bubble ratio was 49%. The other conditions were the same as those in Example 11.

<비교실시예 1>Comparative Example 1

본 발명의 효과를 비교하기 위하여 플라이 애쉬를 첨가하지 않고, 시멘트 240㎏, 물 160㎏, 기포율 80%로 하였고 다른 조건은 실시예 1과 동일하다.In order to compare the effects of the present invention, fly ash was not added, cement 240 kg, water 160 kg, and a foaming ratio of 80%. The other conditions were the same as in Example 1.

<비교실시예 2>Comparative Example 2

시멘트 280㎏, 물 178㎏, 기포율 77%로 하였고 다른 조건은 실시예 3과 동일하다.Cement 280 kg, water 178 kg, the foaming rate was 77% and the other conditions are the same as in Example 3.

<비교실시예 3>Comparative Example 3

시멘트 320㎏, 물 197㎏, 기포율 74%로 하였고 다른 조건은 실시예 6과 동일하다.320 kg of cement, 197 kg of water, and a bubble ratio of 74% were used, and the other conditions were the same as those in Example 6.

<비교실시예 4>Comparative Example 4

시멘트 400㎏, 물 234㎏, 기포율 67%로 하였고 다른 조건은 실시예 9와 동일하다.400 kg of cement, 234 kg of water, and a foaming rate of 67% were used, and the other conditions were the same as in Example 9.

<비교실시예 5>Comparative Example 5

시멘트 500㎏, 물 280㎏, 기포율 59%로 하였고 다른 조건은 실시예 11과 동일하다.500 kg of cement, 280 kg of water, and a foaming rate of 59% were used, and the other conditions were the same as in Example 11.

실험 결과는 표 2에 나타나 있다. 실험 결과 플라이 애쉬의 첨가에 따라 압축강도는 플라이 애쉬를 첨가하지 않은 경우보다 증가하였다. 이는 플라이 애쉬와 시멘트 수화생성물간의 반응에 의한 결과라 할 수 있으며, 플라이 애쉬의 첨가에 의해 워커빌리티가 향상되어 단위수량을 줄일 수 있으므로 건조수축에 의한 균열의 발생을 줄일 수 있다. 열전도율은 플라이 애쉬를 첨가하지 않은 경우 보다 다소 증가하였으나 비교적 양호한 결과를 보이고 있어, 본 발명에 의해 압축강도가 개선되고, 열전도율이 양호한 경량 기포콘크리트 조성물을 얻을 수 있다.The experimental results are shown in Table 2. As a result, the compressive strength increased with the addition of the fly ash. This may be a result of the reaction between the fly ash and the cement hydration product, the workability is improved by the addition of the fly ash can reduce the number of units can reduce the occurrence of cracks due to dry shrinkage. Although the thermal conductivity was slightly increased than when the fly ash was not added, it showed a relatively good result. Thus, the present invention can improve the compressive strength and obtain a lightweight foamed concrete composition having good thermal conductivity.

구 분division 비 중importance 압축강도(㎏/㎠)Compressive strength (㎏ / ㎠) 열전도율(㎉/mh℃)Thermal conductivity (㎉ / mh ℃) 실시예 1Example 1 0.280.28 77 0.0730.073 실시예 2Example 2 0.320.32 1010 0.0810.081 비교실시예 1Comparative Example 1 0.240.24 55 0.0650.065 실시예 3Example 3 0.320.32 1111 0.0830.083 실시예 4Example 4 0.360.36 1414 0.090.09 실시예 5Example 5 0.40.4 1616 0.0950.095 비교실시예 2Comparative Example 2 0.280.28 88 0.0750.075 실시예 6Example 6 0.360.36 1515 0.090.09 실시예 7Example 7 0.40.4 1818 0.0950.095 실시예 8Example 8 0.440.44 2222 0.1050.105 비교실시예 3Comparative Example 3 0.320.32 1111 0.0850.085 실시예 9Example 9 0.480.48 2525 0.1100.110 실시예 10Example 10 0.560.56 3232 0.1250.125 비교실시예 4Comparative Example 4 0.40.4 1717 0.1000.100 실시예 11Example 11 0.580.58 3434 0.130.13 실시예 12Example 12 0.660.66 4242 0.1450.145 비교실시예 5Comparative Example 5 0.50.5 2727 0.1150.115

플라이 애쉬는 미분탄이 연소된 후 용융 성분이 급랭되어 생기므로 입자의 대부분은 표면이 미끄러운 구상이며, 콘크리트에 혼화재로 첨가할 경우 워커빌리티가 향상되어 소요의 반죽질기를 얻기 위한 수량이 감소한다. 대략 첨가율 25% 정도에서 7%정도의 단위수량 감소효과가 있다. 따라서 종래의 경량 기포콘크리트 조성물의 경우는 소요 워커빌리티를 확보하기 위하여 다량의 물을 첨가함으로써 건조수축 균열이 다발하는 문제가 있었으나, 본 발명의 경량 기포콘크리트 조성물의 경우는 플라이 애쉬의 첨가에 의해 워커빌리티가 향상되므로 단위수량을 그만큼 감소시킬 수 있어 건조수축에 의한 균열발생을 줄일 수 있다.Fly ash is produced by quenching the molten component after the pulverized coal is burned, so most of the particles are spherical surfaces with a slippery surface. There is an effect of reducing the unit quantity of about 25% to 7% of the addition rate. Therefore, in the case of the conventional lightweight foamed concrete composition, there is a problem that dry shrinkage cracking occurs by adding a large amount of water in order to secure required workability. As it improves, the amount of unit can be reduced by that, which can reduce the occurrence of cracks caused by dry shrinkage.

시멘트의 수화반응은 열을 발생시키는 발열반응이므로 수화과정에서 콘크리트의 온도가 올라가며, 콘크리트의 온도가 높아졌다 다시 냉각되는 과정에서 콘크리트에 온도균열이 발생한다. 그러나, 플라이 애쉬는 시멘트의 수화반응의 결과 생성된 수산화칼슘과 반응하여 경화하며, 그 반응속도는 시멘트에 비해 상당히 느리므로 콘크리트의 초기 수화열을 줄일 수 있다. 따라서 본 발명의 경량 기포콘크리트 조성물은 시멘트의 일부를 플라이 애쉬로 치환하여 시멘트의 수화과정에서 발생하는 수화열을 저감시켜 콘크리트의 온도상승을 줄이고 온도균열의 발생을 감소시킬 수 있다.Since the hydration of cement is an exothermic reaction that generates heat, the temperature of concrete rises during hydration, and the temperature of concrete rises. However, the fly ash hardens by reacting with calcium hydroxide produced as a result of the hydration of cement, and the reaction rate is considerably slower than that of cement, thereby reducing the initial heat of hydration of concrete. Therefore, the lightweight foamed concrete composition of the present invention can replace a portion of the cement with fly ash to reduce the heat of hydration generated during the hydration of the cement to reduce the temperature rise of the concrete and reduce the occurrence of temperature cracks.

플라이 애쉬를 첨가한 콘크리트의 강도는 초기재령에서는 플라이 애쉬를 첨가하지 않은 경우보다 감소하지만, 장기적으로는 상당히 증가한다. 특히, 장기강도 증진의 효과는 압축강도에서 현저하며, 이는 플라이 애쉬와 시멘트 경화체와의 경계면이 포졸란 반응 생성물로 충진되어 상호간의 결합이 강화되었기 때문이다. 따라서 본 발명의 경량 기포콘크리트 조성물은 압축강도가 향상되어 콘크리트 타설후 파손이나 균열의 발생이 적어 우수한 품질의 확보가 가능하다.The strength of concrete with fly ash decreases at an early age than without fly ash, but increases significantly in the long run. In particular, the effect of long-term strength enhancement is remarkable in compressive strength because the interface between the fly ash and the hardened cement is filled with the pozzolanic reaction product, thereby strengthening the bonds. Accordingly, the lightweight foamed concrete composition of the present invention is improved in compressive strength and less breakage or cracking occurs after concrete placement, thereby ensuring excellent quality.

그 외에도 플라이 애쉬를 사용함으로써 콘크리트의 동결융해 저항성이 향상되고, 중성화에 대한 저항성이 커지는 등의 효과가 있다.In addition, the use of fly ash has the effect of improving the resistance to freezing and thawing of concrete, and increasing resistance to neutralization.

Claims (4)

시멘트와 플라이 애쉬(Fly Ash)를 중량비로 2 내지 8 대 1의 비율로 혼합하고 물을 가하여 시멘트 페이스트를 만들고, 기포제를 발포시켜 생성한 기포를 상기 기포가 전체 용적의 50 내지 80%가 되도록 상기 시멘트 페이스트에 혼합한 것을 특징으로 하는 경량 기포콘크리트 조성물.Mixing cement and fly ash in a ratio of 2 to 8 to 1 by weight, adding water to make a cement paste, and foaming the foaming agent so that the bubbles are 50 to 80% of the total volume. Lightweight foamed concrete composition, characterized in that it is mixed with cement paste. 제1항에서, 상기 기포제는 동물성 단백질계 기포제 또는 계면활성제계 기포제 중의 하나인 것을 특징으로 하는 경량 기포콘크리트 조성물.The method of claim 1, wherein the foaming agent is a lightweight foamed concrete composition, characterized in that the animal protein-based foaming agent or one of the surfactant-based foaming agent. 기포제에 물을 섞어 희석액을 만들고, 상기 희석액을 기포발생장치에 투입하여 기포를 발생시키는 단계;Mixing the foaming agent with water to make a dilution liquid, and injecting the dilution liquid into the bubble generator to generate bubbles; 시멘트와 플라이 애쉬를 중량비 2 내지 8 대 1로 혼합하고, 물을 혼합하여 시멘트 페이스트를 만드는 단계; 및,Mixing cement and fly ash in a weight ratio of 2 to 8 to 1 and mixing water to make a cement paste; And, 상기 기포의 용적이 전체 용적의 50 내지 80%가 되도록 상기 기포를 상기 시멘트 페이스트에 혼합하고 교반하는 단계;Mixing and stirring the bubbles in the cement paste so that the bubbles have a volume of 50 to 80% of the total volume; 로 구성되는 것을 특징으로 하는 경량 기포콘크리트 조성물의 제조방법.Method for producing a lightweight foam concrete composition, characterized in that consisting of. 제3항에서, 상기 기포제는 동물성 단백질계 기포제 또는 계면활성제계 기포제 중의 하나인 것을 특징으로 하는 경량 기포콘크리트 조성물의 제조 방법.4. The method of claim 3, wherein the foaming agent is one of an animal protein foaming agent or a surfactant foaming agent.
KR1019980026382A 1998-07-01 1998-07-01 Lightweight aerated concrete composition containing fly ash and preparation method thereof KR20000007185A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019980026382A KR20000007185A (en) 1998-07-01 1998-07-01 Lightweight aerated concrete composition containing fly ash and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019980026382A KR20000007185A (en) 1998-07-01 1998-07-01 Lightweight aerated concrete composition containing fly ash and preparation method thereof

Publications (1)

Publication Number Publication Date
KR20000007185A true KR20000007185A (en) 2000-02-07

Family

ID=19542678

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019980026382A KR20000007185A (en) 1998-07-01 1998-07-01 Lightweight aerated concrete composition containing fly ash and preparation method thereof

Country Status (1)

Country Link
KR (1) KR20000007185A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000014685A (en) * 1998-08-24 2000-03-15 정종순 Light insulating mortar composition having improved curing property and contraction-stability
KR100471195B1 (en) * 2001-09-18 2005-03-07 지오콘머테리얼 주식회사 Light weight soil cement having an air bubble for infilling, reclamation and banking and manufacturing method thereof
KR100814964B1 (en) * 2007-02-22 2008-03-19 주식회사 포스코건설 Light weighted foam concrete containing bottom ash and production method thereof
KR20160111696A (en) * 2015-03-17 2016-09-27 경기대학교 산학협력단 Light-weight aerated concrete mix method using the special composition with emhancement of crack control and flexural performance
KR20160114376A (en) * 2015-03-24 2016-10-05 공주대학교 산학협력단 Composition for foam concrete with high insulation for reducing of floor impact sound, manufacturing method of foam concrete using the same and foam concrete with high insulation for reducing of floor impact sound manufactured using the same
WO2016167440A1 (en) * 2015-04-13 2016-10-20 경기대학교 산학협력단 Method for manufacturing soil concrete for plant growth

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000014685A (en) * 1998-08-24 2000-03-15 정종순 Light insulating mortar composition having improved curing property and contraction-stability
KR100471195B1 (en) * 2001-09-18 2005-03-07 지오콘머테리얼 주식회사 Light weight soil cement having an air bubble for infilling, reclamation and banking and manufacturing method thereof
KR100814964B1 (en) * 2007-02-22 2008-03-19 주식회사 포스코건설 Light weighted foam concrete containing bottom ash and production method thereof
KR20160111696A (en) * 2015-03-17 2016-09-27 경기대학교 산학협력단 Light-weight aerated concrete mix method using the special composition with emhancement of crack control and flexural performance
KR20160114376A (en) * 2015-03-24 2016-10-05 공주대학교 산학협력단 Composition for foam concrete with high insulation for reducing of floor impact sound, manufacturing method of foam concrete using the same and foam concrete with high insulation for reducing of floor impact sound manufactured using the same
WO2016167440A1 (en) * 2015-04-13 2016-10-20 경기대학교 산학협력단 Method for manufacturing soil concrete for plant growth
KR20160122025A (en) * 2015-04-13 2016-10-21 경기대학교 산학협력단 Manufacturing method of Terra concrete for growing plants
US10118868B2 (en) 2015-04-13 2018-11-06 Kyonggi University Industry And Academia Cooperation Foundation Production method of artificial bio-soil aggregates based on foamed concrete for plant growth

Similar Documents

Publication Publication Date Title
EP2658823B1 (en) Lightweight fly ash based composition
US4210457A (en) Portland cement-fly ash-aggregate concretes
KR101547272B1 (en) High strength cement mortar and concrete including industrial by-products
CN102910889B (en) Aerated concrete wall material containing river silt and preparation method thereof
CN101581131B (en) Non-autoclaved aerated concrete building block and manufacturing method
CN102701656A (en) Metakaolin-based polymer foam concrete and preparation method thereof
CN103771817A (en) Desulfurized gypsum foam concrete and preparation method thereof
CN102515673A (en) Circulating fluidized bed boiler ash cement-based self-leveling material
CN105174887A (en) Modified desulphurization gypsum-based mater batch and preparation method therefor
JP2019085304A (en) Non-shrinkage grout composition, and non-shrinkage grout material
CN106220067A (en) A kind of slag fire-retardant heat insulation foam concrete and preparation method thereof
CN101786822A (en) High-impervious microcrystal self-curing type cement additive
CN105016671A (en) Superfluid self-compacting concrete and preparing method thereof
CN105541221A (en) Novel energy-saving thermal insulation mortar and preparation method thereof
KR101122038B1 (en) Ultra light aerated concrete composition and method of wall using the same
KR102228810B1 (en) Lightweight Aerated Concret Block
CN105016636A (en) Supersulphated foamed cement insulation board and preparation process thereof
CN106747638B (en) Foam concrete main material
CN106278029B (en) A kind of alkali-activated carbonatite large-doping-amount fly ash cement foaming insulation board and preparation method thereof
KR20000007185A (en) Lightweight aerated concrete composition containing fly ash and preparation method thereof
CN113493340B (en) Magnesium phosphate-based foam concrete heat-insulating material
CN113004055B (en) Green high-thermal-resistance self-insulation building block and preparation method thereof
KR20040017144A (en) Composition of Lightweight / Foamed Concrete and Method of Making Same
CN110885204B (en) Anti-cracking reinforcing material for long-life concrete product and preparation method and application thereof
CN115385623A (en) Carbon absorption foam concrete based on industrial waste residues and preparation method thereof

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E601 Decision to refuse application