RU2149843C1 - Expanding additive to cement - Google Patents

Expanding additive to cement Download PDF

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Publication number
RU2149843C1
RU2149843C1 RU98122708A RU98122708A RU2149843C1 RU 2149843 C1 RU2149843 C1 RU 2149843C1 RU 98122708 A RU98122708 A RU 98122708A RU 98122708 A RU98122708 A RU 98122708A RU 2149843 C1 RU2149843 C1 RU 2149843C1
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Russia
Prior art keywords
sulfoaluminate
cement
expanding
corundum
gypsum
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RU98122708A
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Russian (ru)
Inventor
Г.М. Мартиросов
Л.А. Титова
М.И. Бейлина
М.Ю. Титов
А.О. Лебедев
И.Л. Сиденко
А.Н. Посысаев
Original Assignee
Государственный научно-исследовательский, проектно-конструкторский и технологический институт бетона и железобетона (НИИЖБ)
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Priority to RU98122708A priority Critical patent/RU2149843C1/en
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Publication of RU2149843C1 publication Critical patent/RU2149843C1/en

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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
    • 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
    • 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
    • C04B14/30—Oxides other than silica
    • C04B14/303—Alumina
    • 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
    • C04B22/008—Cement and like inorganic materials added as expanding or shrinkage compensating ingredients in mortar or concrete compositions, the expansion being the result of a recrystallisation
    • 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
    • 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
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/2015—Sulfate resistance
    • 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

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

Abstract

FIELD: manufacture of straining, expanding and shrinkage-free cements and concretes. SUBSTANCE: expanding additive comprises sulfoaluminate clinker in which calcium sulfoaluminate and mayonite are present at 6:1 to 5:1 ratio and finely ground corundum with specific surface of 6000 to 10.000 sq. cm/g, ratios of components being as follows, wt %; said sulfoaluminate clinker, 40-65; corundum, 40-65; and gypsum, 34-35. EFFECT: increased strength during hardening period and sulfate resistance of cement stone. 2 tbl

Description

Изобретение относится к строительным материалам, а именно к составам добавок для получения напрягающих, расширяющихся и безусадочных цементов и бетонов. The invention relates to building materials, and in particular to compositions of additives for producing tensile, expanding and non-shrinking cements and concrete.

Известны составы вяжущего, включающие сульфоалюминат кальция, сульфат кальция и свободную окись кальция (1). Known binder compositions, including calcium sulfoaluminate, calcium sulfate and free calcium oxide (1).

Недостатком этого изобретения является невысокая прочность вяжущего в ранние сроки твердения. The disadvantage of this invention is the low strength of the binder in the early stages of hardening.

Наиболее близким к предлагаемому по технической сущности и достигаемому результату является добавка к вяжущему, включающая сульфоалюминат кальция, сульфат кальция и гидроалюминат кальция (2). The closest to the proposed technical essence and the achieved result is an additive to the binder, including calcium sulfoaluminate, calcium sulfate and calcium hydroaluminate (2).

Недостатком известного состава является сложная технология приготовления расширяющего компонента вяжущего, требующего производства более энергоемкого обжига и сложной технологии. Кроме того, бетоны на основе этого вяжущего обладают недостаточно высокой прочностью при сжатии и низкой сульфатостойкостью. A disadvantage of the known composition is the complex technology for the preparation of the expanding component of the binder, which requires the production of more energy-intensive firing and complex technology. In addition, concretes based on this binder have insufficiently high compressive strength and low sulfate resistance.

Техническая задача заключается в получении расширяющей добавки к цементу, обеспечивающей повышенную прочность в период твердения и сульфатостойкость цементного камня. The technical problem is to obtain an expanding additive to cement, providing increased strength during hardening and sulfate resistance of cement stone.

Поставленная задача решается таким образом, что расширяющая добавка к цементу, включающая алюмосодержащий компонент на основе сульфоалюмината кальция и гипса, согласно изобретению, в качестве алюмосодержащего компонента содержит сульфоалюминатный клинкер с соотношением сульфоалюмината кальция: майенит 5:1 - 6:1 и тонкомолотый корунд с удельной поверхностью 6000 - 10000 см2/г при следующем соотношении компонентов, маc.%:
Сульфоалюминатный клинкер - 40-65
Корунд - 1-5
Гипс - 34-55
Предлагаемая расширяющая добавка к цементу отличается от известной тем, что в качестве алюмосодержащего компонента содержит обожженный сульфоалюминатный клинкер с соотношением сульфоалюмината кальция (C4A3S) и майенита (C12A7) 5: 1 - 6:1 и тонкомолотый корунд с удельной поверхностью 6000-10000 см2/г.The problem is solved in such a way that an expanding additive to cement, including an aluminum-containing component based on calcium sulfoaluminate and gypsum, according to the invention, as an aluminum-containing component contains a sulfoaluminate clinker with a ratio of calcium sulfoaluminate: mayenite 5: 1 - 6: 1 and finely ground corundum with specific surface of 6000 - 10000 cm 2 / g in the following ratio of components, wt.%:
Sulphoaluminate clinker - 40-65
Corundum - 1-5
Gypsum - 34-55
The proposed expanding additive to cement differs from the known one in that, as an aluminum-containing component, it contains calcined sulfoaluminate clinker with a ratio of calcium sulfoaluminate (C 4 A 3 S) and mayenite (C 12 A 7 ) 5: 1 - 6: 1 and finely ground corundum with specific a surface of 6000-10000 cm 2 / g.

В процессе гидратации сульфоалюмината кальция (C4A3S) и майенита (C12A7) с сульфатом кальция и минералами портландцемента происходит упрочнение и уплотнение цементного камня за счет образования эттрингита. Тонкомолотый корунд придает цементному камню дополнительное увеличение прочности в ранние сроки твердения.In the process of hydration of calcium sulfoaluminate (C 4 A 3 S) and mayenite (C 12 A 7 ) with calcium sulfate and Portland cement minerals, cement stone hardens and hardens due to the formation of ettringite. Fine-ground corundum gives cement stone an additional increase in strength in the early stages of hardening.

Сульфоалюминатный клинкер получают обжигом сырьевой смеси при температуре 1200 - 1250oC, состоящей из 35% боксита, 50% известняка и 15% гипса.Sulfoaluminate clinker is obtained by firing the raw mixture at a temperature of 1200 - 1250 o C, consisting of 35% bauxite, 50% limestone and 15% gypsum.

Химический состав сульфоалюминатного клинкера, мас.%: SiO2 - 2%; Al2O3 - 15,2%; Fe2O3 - 0,6%; CaO - 36,25%; SO3 - 28%; ппп - 15-72%.The chemical composition of sulfoaluminate clinker, wt.%: SiO 2 - 2%; Al 2 O 3 - 15.2%; Fe 2 O 3 - 0.6%; CaO 36.25%; SO 3 - 28%; PPP - 15-72%.

Тонкомолотый корунд получают помолом отходов огнеупорной промышленности. (ГОСТ 24704-94). Fine-ground corundum is obtained by grinding waste from the refractory industry. (GOST 24704-94).

Гипс - гипсовый камень, CaSO • 2H2O, порода осадочного происхождения. В качестве примесей содержит доломит, кварцит, гидрооксиды железа и др.Gypsum - gypsum stone, CaSO • 2H 2 O, a rock of sedimentary origin. As impurities it contains dolomite, quartzite, iron hydroxides, etc.

Остальные исходные материалы дозируют и измельчают в помольном оборудовании до удельной поверхности не менее 3000 см2/г.The remaining starting materials are metered and ground in grinding equipment to a specific surface area of at least 3000 cm 2 / g.

Составы компонентов предлагаемой добавки приведены в таблице 1. The compositions of the components of the proposed additives are shown in table 1.

Исследование физико-технических свойств вяжущего, полученного путем механического перемешивания 90% портландцемента Д5М400 (портландцемент алитовый, среднеалюминатный) и 10% добавки, представлено в таблице 2. The study of the physical and technical properties of the binder obtained by mechanical stirring of 90% Portland cement D5M400 (Portland cement alite, medium aluminate) and 10% additive is presented in table 2.

Опытные образцы вяжущего получены с использованием расширяющих добавок, состав которых представлен в таблице 1. Experimental binder samples were obtained using expanding additives, the composition of which is presented in table 1.

Образцы хранились в естественных воздушно-влажностных условиях и в 5% растворах солей Na2SO4 и MgSO4 и испытывались через 6 ч, 1 сут, 28 сут и в возрасте 1 года.Samples were stored in natural air-humidity conditions and in 5% solutions of Na 2 SO 4 and MgSO 4 salts and were tested after 6 hours, 1 day, 28 days and at the age of 1 year.

Расширяющую добавку можно добавлять к цементу либо вводить непосредственно в бетонную смесь при ее приготовлении. The expanding additive can be added to the cement or injected directly into the concrete mixture during its preparation.

Источники информации:
1. Патент Англии N 1344759. кл. C 18, публ. 1972.Sources of information:
1. Patent of England N 1344759. cl. C 18, publ. 1972.

2. SU Авторское свидетельство N 573456. Б.И. N 35, кл. C 04 В 7/00, 1977 г. - прототип. 2. SU Copyright certificate N 573456. B.I. N 35, cl. C 04 B 7/00, 1977 - prototype.

Claims (1)

Расширяющая добавка к цементу, включающая алюмосодержащий компонент на основе сульфоалюмината кальция и гипс, отличающаяся тем, что в качестве указанного компонента содержит сульфоалюминатный клинкер в соотношении сульфоалюмината кальция и майенита 5 : 1 - 6 : 1, и тонкомолотый корунд с удельной поверхностью 6000 - 10000 см2/г при следующем соотношении компонентов, мас. %:
Сульфоалюминатный клинкер - 40 - 65
Корунд - 1 - 5
Гипс - 34 - 35An expanding additive to cement, including an aluminum-containing component based on calcium sulfoaluminate and gypsum, characterized in that as the specified component contains sulfoaluminate clinker in the ratio of calcium sulfoaluminate and mayenite 5: 1 - 6: 1, and finely ground corundum with a specific surface of 6000 - 10000 cm 2 / g in the following ratio of components, wt. %:
Sulfoaluminate clinker - 40 - 65
Corundum - 1 - 5
Gypsum - 34 - 35
RU98122708A 1998-12-18 1998-12-18 Expanding additive to cement RU2149843C1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2557593C2 (en) * 2010-05-05 2015-07-27 Фив Фсб Grinding of mineral stock containing at least calcium and metal impurities and plant to this end
RU2767481C1 (en) * 2021-10-12 2022-03-17 Публичное акционерное общество «Северсталь» (ПАО «Северсталь») Expansion admixture based on iron-containing pulverized waste for expanding cement
RU2769164C1 (en) * 2021-10-13 2022-03-28 Публичное акционерное общество «Северсталь» (ПАО «Северсталь») Expansion admixture for cement containing steel slag

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2557593C2 (en) * 2010-05-05 2015-07-27 Фив Фсб Grinding of mineral stock containing at least calcium and metal impurities and plant to this end
RU2767481C1 (en) * 2021-10-12 2022-03-17 Публичное акционерное общество «Северсталь» (ПАО «Северсталь») Expansion admixture based on iron-containing pulverized waste for expanding cement
RU2769164C1 (en) * 2021-10-13 2022-03-28 Публичное акционерное общество «Северсталь» (ПАО «Северсталь») Expansion admixture for cement containing steel slag

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