KR100421250B1 - A cement admixture for concrete-making - Google Patents

A cement admixture for concrete-making Download PDF

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KR100421250B1
KR100421250B1 KR10-2000-0005598A KR20000005598A KR100421250B1 KR 100421250 B1 KR100421250 B1 KR 100421250B1 KR 20000005598 A KR20000005598 A KR 20000005598A KR 100421250 B1 KR100421250 B1 KR 100421250B1
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concrete
long
weight
cement
strength
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손연자
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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
    • C04B7/00—Hydraulic cements
    • C04B7/14—Cements containing slag
    • C04B7/147—Metallurgical slag
    • C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

본 발명은 콘크리트의 초기 강도및 장기 강도를 모두 향상시킬 수 있도록 고로 슬래그 80∼99 중량％, 무수석고 0.5∼10 중량％, 석회석 0.5∼10 중량％로 배합한 시멘트 혼화재에 관한 것으로, 초기강도 및 장기강도가 모두 양호하므로 수화열이 낮은 매스콘크리트, 초기강도를 요하는 구조물, 장기 강도를 요하는 구조물, 내구성, 수밀성, 화학 저항성을 요하는 구조물등 수요자의 요구에 부응하여 다양한 토목 또는 건축물에 유용하게 사용할 수 있으며, 또한 본 발명 혼화재는 폐기물이면서 주변에서 쉽게 구할 수 있는 재료를 사용하므로써 콘크리트 제조 단가를 크게 줄일 수 있는 효과를 갖는 것이다.The present invention relates to a cement admixture blended with 80 to 99% by weight of blast furnace slag, 0.5 to 10% by weight of gypsum and 0.5 to 10% by weight of limestone to improve both the initial strength and the long-term strength of concrete. Long-term strength is all good, so it is useful for various civil works or buildings to meet the needs of users such as mass concrete with low hydration heat, structures requiring initial strength, structures requiring long-term strength, and structures requiring durability, watertightness, and chemical resistance. In addition, the admixture of the present invention has the effect of greatly reducing the cost of manufacturing concrete by using materials that are easily available in the surroundings while being waste.

Description

콘크리트 제조용 시멘트 혼화재{A cement admixture for concrete-making}A cement admixture for concrete-making

본 발명은 콘크리트 제조용 시멘트 혼화재에 관한 것으로, 특히 콘크리트의 내구성 증대를 위해 보통포틀랜드시멘트에 혼합하여 콘크리트를 제조하기 위한 시멘트 혼화재에 관한 것이다.The present invention relates to a cement admixture for producing concrete, and more particularly, to a cement admixture for producing concrete by mixing with ordinary portland cement in order to increase durability of concrete.

콘크리트 제조용 시멘트 혼화재는 건설 또는 토목공사 구조물의 용도에 맞는 콘크리트를 제조하기 위해 일반적인 시멘트에 10∼50중량％ 범위 내에서 혼합하여 사용하기 위한 조성물이다.Cement admixtures for the production of concrete is a composition for use in mixing within the range of 10 to 50% by weight in general cement to produce concrete for the use of construction or civil engineering structures.

종래 콘크리트 제조시 일반적으로 사용하는 시멘트는 보통포틀랜드시멘트를 사용하고 있으나 상기 보통포틀랜드시멘트는 초기 압축강도(7일) 증진은 높지만, 장기 압축강도(28일) 증진은 낮은 단점을 갖는 것이다.Conventional cement is generally used in the manufacture of concrete, but the ordinary portland cement, although the increase in the initial compressive strength (7 days), the long-term compressive strength (28 days) enhancement has a disadvantage of low.

따라서 보통포틀랜드시멘트의 경우 토목, 건설, 해양공사 및 수화열이 낮은 매스콘크리트, 장기 강도를 요하는 구조물, 내구성, 수밀성, 화학 저항성을 요하는 구조물 등 장기강도를 필요로 하는 구조물에는 사용할 수 없는 폐단을 갖는 것이다.Therefore, in case of ordinary Portland cement, the closed end which cannot be used for structures requiring long-term strength such as civil engineering, construction, offshore construction, low-heating mass concrete, structures requiring long-term strength, and structures requiring durability, watertightness, and chemical resistance To have.

그러므로 보통포틀랜드시멘트의 장기강도를 증진시키기 위한 혼화재에 대한 연구가 매우 활발하게 진행되고는 있으나, 아직까지는 장기적인 강도증진 효과를 확신할 수 없고, 혼화재 제조시 고가의 비용이 소요되는 등의 이유로 만족할 만한 결과를 얻지 못하고 있는 실정이다.Therefore, studies on admixtures to improve the long-term strength of ordinary Portland cement have been actively conducted. However, it is still unsatisfactory for the long-term strength enhancement effect and satisfactory reasons such as high cost for admixtures. The situation is not getting results.

본 발명은 보통포틀랜드시멘트의 장기 강도를 증진시킬 수 있도록 고로슬래그 80∼99 중량％, 무수석고 0.5∼10 중량％, 석회석 0.5∼10 중량％를 서로 배합하여 구성된 시멘트 혼화재로써, 상기 시멘트 혼화재를 보통포틀랜드시멘트에 혼합하여 사용하게 되면 보통포틀랜드시멘트의 장기강도가 증진되어지고 이로인해 보통포틀랜드시멘트를 초기강도와 장기강도 모두를 요구하는 구조물에도 유용하게 사용할 수 있는 것이다.The present invention is a cement admixture composed of 80 to 99% by weight of blast furnace slag, 0.5 to 10% by weight of anhydrous gypsum, and 0.5 to 10% by weight of limestone to improve the long-term strength of ordinary portland cement. When used in combination with portland cement, the long-term strength of ordinary portland cement is enhanced, which makes it possible to use ordinary portland cement in structures requiring both initial strength and long-term strength.

본 발명의 또다른 목적은 장기강도 증진을 만족시키면서도 저렴한 비용의 혼화재를 제조할 수 있는 시멘트 혼화재를 제공하기 위한 것이다.Another object of the present invention is to provide a cement admixture capable of producing a low cost admixture while satisfying long-term strength enhancement.

본 발명은 고로 슬래그, 무수석고, 석회석을 조성물로 하는 시멘트 혼화재에 있어서 상기 혼화재의 조성이 고로슬래그 80∼99 중량％, 무수석고 0.5∼10 중량％, 석회석 0.5∼10 중량％가 서로 배합되어져 구성되어진 것이다.In the cement admixture comprising blast furnace slag, anhydrous gypsum and limestone as a composition, the composition of the admixture is composed of 80 to 99 wt% of blast furnace slag, 0.5 to 10 wt% of anhydrous gypsum, and 0.5 to 10 wt% of limestone. It is done.

고로슬래그는 제철소의 제강공정 중 고로에서 발생하는 슬래그로 상당량이폐기되거나 저부가의 자원으로 활용되고 있다. 본 발명에서는 상기 고로슬래그의 화학적 조성은 SiO2(%) 34.51, Al2O3(%) 15.87, Fe2O3(%) 0.3, CaO(%) 42.65, MgO(%) 5.87, SO3(%) 0.06으로 이루어져 있고, 상기 고로슬래그를 보통포틀랜드시멘트에 혼합하여 물과 반응시키면 이산화규소(SiO2)와 산화알루미늄(Al2O3)와 시멘트 수화반응에 생성되는 수산화칼슘(Ca(OH)2)와 서서히 반응하여 칼슘실리케이트 수화물을 생성하는 포졸란 반응(Ca(OH)2+(SiO2,Al2O3))이 생긴다는 점에 착안하여 상기 고로슬래그를 본 발명 혼화재의 주된 조성물로 사용한 것이다.Blast furnace slag is a slag generated from the blast furnace during the steelmaking process of the steel mill, and a considerable amount is discarded or used as a low value resource. In the present invention, the chemical composition of the blast furnace slag is SiO 2 (%) 34.51, Al 2 O 3 (%) 15.87, Fe 2 O 3 (%) 0.3, CaO (%) 42.65, MgO (%) 5.87, SO 3 ( %) 0.06, and when the blast furnace slag is mixed with ordinary portland cement and reacted with water, calcium hydroxide (Ca (OH) 2 ) formed during the hydration reaction of silicon dioxide (SiO 2 ) and aluminum oxide (Al 2 O 3 ) and cement The blast furnace slag is used as the main composition of the admixture of the present invention, taking note of the fact that the pozzolanic reaction (Ca (OH) 2 + (SiO 2 , Al 2 O 3 )), which gradually reacts with () to produce calcium silicate hydrate, occurs. .

즉 고로슬래그는 상기 포졸란반응에 의해 보통포틀랜드시멘트의 장기강도를 약화시키는 Ca(OH)2를 소비하게 되므로 시멘트 경화체의 구조 형성을 담당하는 수화물경화체인 C-S-H 겔을 증가시키게 되는 것이다.That is, the blast furnace slag consumes Ca (OH) 2 , which weakens the long-term strength of the ordinary portland cement by the pozzolanic reaction, thereby increasing the CSH gel, a hydrate hardener which is responsible for forming the cement hardened structure.

이처럼 고로슬래그를 혼화재로 하여 보통포틀랜드시멘트에 혼합하게 되면 포졸란 반응에 의해 콘크리트 경화제가 수밀하게 되며 잠재 수경성에 의해 장기 강도가 증진하게 된다.In this way, when the blast furnace slag is mixed with ordinary portland cement, the concrete hardener becomes watertight by the pozzolanic reaction and the long-term strength is enhanced by the latent hydraulic properties.

한편 상기 고로슬래그에 첨가되어 시멘트의 장기강도를 보다 증진시키기 위한 조성물로 무수석고를 사용하였으며, 상기 무수석고의 화학적 조성은 SiO2(%) 1.0, Al2O3(%) 0.92, Fe2O3(%) 0.1, CaO(%) 40.39, SO3(%) 57.5로 이루어져 있다.Meanwhile, anhydrous gypsum was used as a composition added to the blast furnace slag to further enhance the long-term strength of the cement. The chemical composition of the anhydrous gypsum was SiO 2 (%) 1.0, Al 2 O 3 (%) 0.92, Fe 2 O 3 (%) 0.1, CaO (%) 40.39, SO 3 (%) 57.5.

따라서 상기 무수석고를 시멘트와 혼합하여 물과 반응시키게 되면 에트링자이트(3CaO, Al2O3, 3CaSO4, 32H2O)가 수화반응을 일으키면서 감수(減水)효과 및 미세입자의 공극충진으로 조직이 치밀화되므로 초기강도가 증가하며 수화가 촉진된다.Therefore, when the anhydrous gypsum is mixed with cement and reacted with water, ettringite (3CaO, Al 2 O 3 , 3CaSO 4 , 32H 2 O) undergoes a hydration reaction, thereby reducing the water-repellent effect and filling the pores of the fine particles. As the tissue is densified, the initial strength increases and hydration is promoted.

또 다른 혼화재 조성물인 석회석의 화학적 조성은 SiO2(%) 1.0, Al2O3(%) 0.8, Fe2O3(%) 0.14, CaO(%) 55.1, MgO(%) 0.37, SO3(%) 0.2, lg-10SS(%) 41.5로 이루어져 있으며, 상기 석회석은 시멘트 성분중 C3S(3CaO, SiO2)의 수화를 촉진시켜 초기강도를 증진시키며 경화체의 공극을 충진시키므로써 내구성을 증대시키는데 기여한다.Limestone, another admixture composition, has a chemical composition of SiO 2 (%) 1.0, Al 2 O 3 (%) 0.8, Fe 2 O 3 (%) 0.14, CaO (%) 55.1, MgO (%) 0.37, SO 3 ( %) 0.2, lg-10SS (%) 41.5, the limestone promotes the hydration of C 3 S (3CaO, SiO 2 ) in the cement component to increase the initial strength and to increase the durability by filling the pores of the hardened body Contribute to.

이처럼 본 발명은 장기강도를 증진시키는 고로 슬래그와 초기강도를 증진시키는 무수석고와 석회석을 적정비율로 배합하여 시멘트 혼화재를 구성하므로써 상기 시멘트 혼화재를 보통포틀랜드시멘트에 10∼50중량％ 범위 내에서 혼합하여 사용할 경우 상당한 장기강도 증진의 효과가 발생하는 것이다.As such, the present invention mixes the cement admixture with ordinary portland cement in a range of 10 to 50% by weight by combining the blast furnace slag to promote long-term strength and anhydrous gypsum and limestone to enhance initial strength at an appropriate ratio. When used, the effect of significant long-term strength increase occurs.

상기 보통포틀랜드시멘트에 혼합하는 본발명 시멘트 혼화재의 비율은 초기 및 장기강도의 요구량에 맞추어 조절하게 된다. 물론 비율이 높을수록 장기강도는 증진된다.The proportion of the present invention cement admixture mixed with the ordinary portland cement is adjusted to the required amount of initial and long term strength. Of course, the higher the ratio, the longer the intensity increases.

이처럼 본 발명은 보통포틀랜드시멘트의 장기강도 증진을 위해 본 발명을 이루는 조성물인 고로 슬래그와 무수석고, 석회석을 적정비율로 혼합하는 것이 무엇보다 중요하다.As such, the present invention is important to mix blast furnace slag, anhydrous gypsum and limestone, which are the compositions of the present invention, in an appropriate ratio to improve the long-term strength of ordinary portland cement.

본 발명에 있어서 실험 결과 고로 슬래그의 배합비율은 80∼99 중량％이 가장 바람직하였으며, 무수석고의 배합비율은 0.5∼10중량％, 석회석의 배합비율은0.5∼10 중량％이 가장 바람직하였다.In the present invention, the mixing ratio of the blast furnace slag is most preferably 80 to 99% by weight, the mixing ratio of anhydrous gypsum is 0.5 to 10% by weight, the mixing ratio of limestone is most preferably 0.5 to 10% by weight.

이는 무수석고의 배합비율이 0.5% 이하일 경우에는 첨가량이 적어 강도발현이 힘들고, 10%이상일 경우에는 시멘트의 SO3성분이 초과되므로 팽창성이 증가되는 폐단을 갖기 때문이다. 또한 석회석의 배합비율이 0.5%이하일 경우에는 역시 첨가량이 적어 강도발현이 힘들고, 10%이상일 경우에 는C3S의 수화가 과다되어 팽창에 의한 균열이 발생하는 폐단을 갖기 때문이다.This is because when the blending ratio of anhydrous gypsum is 0.5% or less, it is difficult to express strength due to the small amount of addition, and when it is 10% or more, the SO 3 component of the cement is exceeded, which leads to an increase in expandability. In addition, when the mixing ratio of limestone is 0.5% or less, the addition amount is also difficult to express strength, and when it is 10% or more, the C 3 S hydration is excessive, resulting in a cracked end due to expansion.

본 발명은 실시예에 의해 보다 상세히 설명하면 다음과 같다.The present invention is described in more detail by the following examples.

실시예 1Example 1

시멘트 혼화재로 고로 슬래그 97중량％, 무수석고 2.0중량％, 석회석 1.0중량％을 혼합하여 다음과 같은 화학적 조성을 얻었다. 즉 상기 각 조성물이 배합되어 SiO2(%) 33.5, Al2O3(%) 15.42, Fe2O3(%) 0.29, CaO(%) 42.73, MgO(%) 5.69, SO3(%) 1.21와 같은 혼합물이 된 것이다.97 weight% of blast furnace slag, 2.0 weight% of anhydrous gypsum, and 1.0 weight% of limestone were mixed with the cement admixture, and the following chemical composition was obtained. In other words, each of the above compositions were formulated to provide SiO 2 (%) 33.5, Al 2 O 3 (%) 15.42, Fe 2 O 3 (%) 0.29, CaO (%) 42.73, MgO (%) 5.69, SO 3 (%) 1.21 It is like a mixture.

상기와 같은 조성비를 갖는 본 발명에 따른 콘크리트의 성능을 검증하기 위하여 본 발명 혼화재를 보통포틀랜드시멘트에 30중량％ 혼합한 것과 시중에서 시판중인 보통포틀랜드시멘트로 콘크리트를 제조한 다음, 압축강도 특성을 시험하였으며 그 결과는 표 1 에 나타내었다.In order to verify the performance of the concrete according to the present invention having the composition ratio as described above, the composite material of the present invention was mixed with 30% by weight of ordinary portland cement, and concrete was manufactured from commercially available ordinary portland cement, and then tested for compressive strength characteristics. The results are shown in Table 1.

구분division W/C비(%)W / C ratio (%) S/A비(%)S / A ratio (%) 콘크리트 배합량 (Kg/m3)Concrete Mixing Amount (Kg / m 3 ) 사용수Usage 시멘트cement 잔골재Fine aggregate 굵은 골재Coarse aggregate 혼화재Admixture 슬럼프(Cm)Slump (Cm) 공기량(%)Air volume (%) 압축강도(Kg/Cm2)Compressive Strength (Kg / Cm 2 ) 7일7 days 28일28 days OPCOPC 5151 4545 153153 300300 832832 10171017 0.90.9 12.512.5 5.05.0 151151 224224 실시예Example 5151 4545 153153 300300 827827 10111011 0.90.9 12.112.1 4.94.9 145145 287287

상기 표에서 OPC는 보통포틀랜드시멘트이고, W/C는 시멘트(C)에 사용수(W)의 중량비를 나타내고 S/A비는 잔골재(S)에 잔골재 굵은 골재의 전체(A)의 중량비를 나타낸다.In the table, OPC is ordinary portland cement, W / C represents the weight ratio of water (W) to cement (C) and S / A ratio represents the weight ratio of the total aggregate (A) of fine aggregate coarse aggregate to fine aggregate (S). .

표 1 에서 나타난 바와 같이 본 발명의 혼화재를 보통포틀랜드시멘트에 30중량％ 혼합한 것과 보통포틀랜드시멘트의 결과를 비교하면 장기강도(28일)가 약 63정도 향상된 것을 확인할 수 있었다.As shown in Table 1, when the mixed material of the present invention was mixed with 30% by weight of ordinary Portland cement and the results of ordinary Portland cement, the long-term strength (28 days) was confirmed to be improved by about 63.

이처럼 본 발명은 콘크리트 혼화재의 조성물로써 주변에서 쉽게 얻을수 있는 재질인 고로 슬래그, 무수석고, 석회석을 사용하였으며, 특히 고로슬래그의 경우 폐기되거나 저부가가치의 자원으로 활용되던 것을 고부가가치의 자원으로 재활용할 수 있는 것이다.As such, the present invention used blast furnace slag, anhydrous gypsum, and limestone, which are easily obtained from the surroundings, as a composition of concrete admixture, and in particular, the blast furnace slag can be recycled as a high value added resource that has been disposed of or used as a low value added resource. It is.

또한 종래의 보통포틀랜드시멘트에 본 발명 혼화재를 일정량 첨가함으로써 큰크리트의 초기 강도 증진, 장기 강도 증진, 화학저항성, 수밀성, 내해수성, 내구성 증대와 같은 효과를 가질 수 있으며, 콘크리트의 반죽 질기가 향상되고, 콘크리트 제조 단가를 크게 낮출수 있는 콘크리트 혼화재를 사용자들에 제공할 수 있는 매우 유용한 발명인 것이다.In addition, by adding a predetermined amount of the admixture of the present invention to conventional ordinary portland cement, it can have the effect of increasing the initial strength of the large concrete, increasing the long-term strength, chemical resistance, water tightness, sea water resistance, durability, and improve the dough toughness of concrete It is a very useful invention that can provide users with concrete admixtures that can significantly lower the cost of manufacturing concrete.

Claims (1)

화학적 조성이 SiO2(%) 34.51, Al2O3(%) 15.87, Fe2O3(%) 0.3, CaO(%) 42.65, MgO(%) 5.87, SO3(%) 0.06으로 이루어진 고로 슬래그 80∼99 중량％와, 무수석고 0.5∼10 중량％, 석회석을 조성물로 하는 시멘트 혼화재에 있어서 상기 시멘트 혼화재의 석회석의 함량은 0.5∼10 중량％임을 특징으로 하는 콘크리트 제조용 시멘트 혼화재.Blast furnace slag with chemical composition SiO 2 (%) 34.51, Al 2 O 3 (%) 15.87, Fe 2 O 3 (%) 0.3, CaO (%) 42.65, MgO (%) 5.87, SO 3 (%) 0.06 A cement admixture for producing concrete, wherein the amount of limestone in the cement admixture is 0.5 to 10 wt% in a cement admixture comprising 80 to 99 wt%, anhydrous gypsum 0.5 to 10 wt%, and limestone as a composition.
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