RU2305087C1 - Mix for foam concrete - Google Patents

Mix for foam concrete Download PDF

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Publication number
RU2305087C1
RU2305087C1 RU2006104396/03A RU2006104396A RU2305087C1 RU 2305087 C1 RU2305087 C1 RU 2305087C1 RU 2006104396/03 A RU2006104396/03 A RU 2006104396/03A RU 2006104396 A RU2006104396 A RU 2006104396A RU 2305087 C1 RU2305087 C1 RU 2305087C1
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RU
Russia
Prior art keywords
content
foam concrete
cement
caco
water
Prior art date
Application number
RU2006104396/03A
Other languages
Russian (ru)
Inventor
Лариса Борисовна Сватовска (RU)
Лариса Борисовна Сватовская
Валентина Яковлевна Соловьева (RU)
Валентина Яковлевна Соловьева
Владислав Афанасьевич Чернаков (RU)
Владислав Афанасьевич Чернаков
Владимир Николаевич Сурков (RU)
Владимир Николаевич Сурков
Дмитрий Вадимович Соловьев (RU)
Дмитрий Вадимович Соловьев
Дмитрий В чеславович Седов (RU)
Дмитрий Вячеславович Седов
Original Assignee
Государственное образовательное учреждение высшего профессионального образования "Петербургский государственный университет путей сообщения"
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Application filed by Государственное образовательное учреждение высшего профессионального образования "Петербургский государственный университет путей сообщения" filed Critical Государственное образовательное учреждение высшего профессионального образования "Петербургский государственный университет путей сообщения"
Priority to RU2006104396/03A priority Critical patent/RU2305087C1/en
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Publication of RU2305087C1 publication Critical patent/RU2305087C1/en

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Classifications

    • 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
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/06Aluminous cements
    • 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
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/40Porous or lightweight materials

Abstract

FIELD: manufacture of building materials; manufacture of articles for civil and industrial construction engineering.
SUBSTANCE: proposed mix for foam concrete contains the following components, mass-%: high-aluminate cement at content of C3A no less than 7%, 54.43-58.31; sand at Mcr no more than 2.0, 6.71-7.30; hemihydrated phosphogypsum, 4.60-4.70; carbonate-containing waste of soda process at content of CaCO3 no less than 50% and pH of 9-11, 6.90-8.20; modified foaming additive, 0.18-0.27; water, 23.30-25.10.
EFFECT: enhanced compressive strength; reduced shrinkage at hardening; reduced heat conductivity coefficient.
1 tbl, 1 ex

Description

The invention relates to the field of building materials and can be used for the manufacture of products in industrial and civil engineering.
A known mixture for heat-insulating foam concrete, containing, wt.%: Cement - 43,0-46,2; finely ground slag of metallurgical production (with an Fe (II) content of not more than 4%) - 12.0-14.4; sand - 18.0-15.0; a foaming additive (based on sodium stearate of a density of 1.15-1.77 g / cm 3 ) - 9.5-10.3; DEYA chemical additive (including post-yeast distillery vinasse and modifier - expanded porous product with a bulk weight of 0.5 g / cm 3 in an amount of 3.0-0.5 wt.%, represented by calcium-magnesium silicates) - 0.4-0 54 aluminum powder - 0.5-0.64; fiber - 1.4-1.8 and water - 12.0-14.4 (RF patent No. 2145315, С04В 38/10, 03/02/1999).
A known mixture for heat-insulating foam concrete, containing, wt.%: Cement - 44.0-47.04, foaming additive "Nick" (on a protein basis) - 0.5-0.74, mentmorillonite clay (including at least 60% mineral (Al, Mg) 2 (OH) 2 (Si 4 О 10 ) · Н 2 О with specific surface S beats = 500 ... 2000 cm 2 g) 11.0-13.8 and water 40.0-42, 8 (RF patent No. 2145586, С04В 38/10, 03/02/1999)
Closest to the claimed mixture, selected for the prototype, is a mixture for autoclaved foam concrete, containing, wt.%: Cement - 37.8-42.64; sand - 31.3-37.84; modified foaming additive 9.1-9.3 and water 15.1-17.0 (RF patent No. 2255074, С04В 38/10, June 27, 2005).
The disadvantages of these analogues and prototype include insufficient compressive strength, increased value of the coefficient of thermal conductivity and increased shrinkage of the material during hardening.
The objective of the invention is to increase the compressive strength, lower the coefficient of thermal conductivity and reduce the shrinkage of foam during hardening.
The problem is solved in that the mixture for foam concrete, including cement, sand with M cr ≤2.0, a modified foaming additive and water, additionally contains semi-aqueous phosphogypsum, carbonate-containing waste from soda production with a CaCO 3 content of at least 50%, pH 9, 0 ... 11.0, and high-aluminate cement with C 3 A≥7% is used as cement in the following ratio of components, wt.%:
high aluminate cement with a content of C 3 A≥7% 54.43 ... 58.31
sand with M cr ≤2.0 6.71 ... 7.30
semi-aquatic phosphogypsum 4.60 ... 4.70
carbonate-containing waste from soda production with a CaCO 3 content of at least 50%, a pH value of 9.0 ... 11.0 6.90 ... 8.20
modified foaming additive 0.18 ... 0.27
water 23.30 ... 25.10
At the time of application, according to the authors and the applicant, the claimed mixture for foam concrete is unknown and has a world novelty.
The inventive combination of existing features exhibits a new property that allows you to obtain the specified technical result, namely, an increase in compressive strength, a decrease in the thermal conductivity, and a decrease in shrinkage of foam concrete during hardening in comparison with the known technical solution.
New is a new combination of known components used in the production of foam concrete, and their new quantitative ratio, which allows to obtain the specified technical result.
According to the authors and the applicant, this composition for foam concrete is unknown, and we can conclude that the invention meets the condition of patentability “novelty”.
The combined use of semi-aquatic phosphogypsum and finely dispersed carbonate-containing soda waste with a CaCO 3 content of at least 50%, a pH value of 9.0 ... 11.0 ensures the formation of a highly homogeneous finely porous structure, which helps to obtain a material with a lower value of thermal conductivity.
The combined use of semi-aquatic phosphogypsum and high aluminate cement significantly reduces the shrinkage of foam concrete during hardening, and the presence of finely dispersed carbonate-containing waste with a CaCO 3 content of at least 50%, a pH value of 9.0 ... 11.0 enhances hydration processes in the hardening system due to a shift in acid-base equilibrium systems since pH of the cement-containing component = 12.4, which leads to an increase in hydrated neoplasms of calcium silicates and the additional formation of geylussita [Na 2 (CaCO 3 ) 2 · 5H 2 O], d / n = 4.97; 3.13; 2.65; 2.57 and pearsonite [Na 2 (CaCO 3 ) 2 · 2H 2 O], d / n = 2.50; 4.97; 3.16, which is confirmed by physico-chemical studies in particular by XRF. Strengthening hydration processes increases the compressive strength of foam concrete.
The claimed invention is industrially applicable and can be used for the production of heat-insulating structural foam concrete with improved heat-shielding properties, reduced shrinkage during hardening and increased compressive strength.
The feasibility of the invention is confirmed by an example of a specific implementation.
Concrete example
I. Preparation of the mixture for foam concrete
1. Dry phosphogypsum at t ° = 180 ° C to obtain semi-aquatic gypsum.
2. Grind semi-aquatic phosphogypsum to S beats 220 m 2 / kg
3. Dose:
- high aluminate cement with a content of C 3 A≥7%
- sand, M cr ≤2.0
- carbonate-containing waste from soda production with a CaCO 3 content of at least 50%, a pH value of 9.0 ... 11.0
- a modified foaming additive (protein-containing with the complex modifier M-3, a foaming additive, consisting of the ratio: water rosin emulsion (C = 0.004 wt.%) and an aqueous solution of gelatin (C = 0.1 wt.%) as 1.5: 1,0))
- water.
4. Dispensed materials are transported to a concrete mixer, where the materials are mixed until a homogeneous mortar mixture is obtained.
5. Preparation of construction foam:
Dose:
- concentrated solution of a foaming additive;
- water
metered components are mixed in a polyethylene container, receiving a mortar of a foaming additive, from which a foam is obtained using a foam generator.
6. The resulting construction foam is transported using a foam generator pump to a concrete mixer, where it is mixed with the prepared mortar mixture until a homogeneous foam concrete is obtained.
7. The resulting mixture for foam concrete from foam concrete according to claim 6 is poured into the forms of the required product samples, which are cured under natural conditions at a positive temperature to determine the physicomechanical characteristics in accordance with the requirements of GOST 12852-87 “Cellular concrete. General requirements for test methods. " The results are presented in the table.
The analysis of experimental data shows that the claimed mixture for foam concrete in comparison with the prototype provides foam concrete with increased compressive strength by 17.0%; lowering the coefficient of thermal conductivity by 18.0%; a decrease in shrinkage during hardening by 45.0%.
Table
Physico-mechanical properties of foam concrete
No. p / p The composition of the raw mix, wt.% Strength, MPa Coef. heat conductivity, λ W / (m ° С) Shrinkage, m / m
Cement Cement with content, C 3 A≥7% Sand, M cr ≤2.0 Semi-aquatic phosphogypsum CaCO 3 Blowing agent Water
quantity,% pH
prototype 40,2 - 34.55 - - - 9.2 16.05 2,55 0.18 3.0
one. - 54.43 7.3 4.7 8.2 9.0 0.27 25.1 2.68 0.144 1,680
2. - 56.37 7,005 4.65 7.55 0.225 24.2 2.72 0.142 1,670
3. - 58.31 6.71 4.6 6.9 0.18 23.3 2.63 0.143 1,660
four. - 54.43 7.3 4.7 8.2 10.0 0.27 25.1 2.84 0.142 1,670
5. - 56.37 7,005 4.65 7.55 0.225 24.2 2.95 0.140 1,650
6. - 58.31 6.71 4.6 6.9 0.18 23.3 2.73 0.144 1,660
7. - 54.43 7.3 4.7 8.2 11.0 0.27 25.1 2.75 0.145 1,665
8. - 56.37 7,005 4.65 7.55 0.225 24.2 2,8 0.144 1,660
9. - 58.31 6.71 4.6 6.9 0.18 23.3 2.77 0.147 1,665

Claims (1)

  1. A mixture for foam concrete containing cement, sand with M cr not more than 2.0, a modified foaming additive, water, characterized in that it additionally contains semi-aqueous phosphogypsum, carbonate-containing waste from soda production with a CaCO 3 content of at least 50%, pH 9-11 and as a cement - high aluminate cement with a content of C 3 A of at least 7% in the following ratio of components, wt.%:
    High aluminate cement with a content of C 3 A of at least 7% 54.43-58.31 Sand with M cr not more than 2.0 6.71-7.30 Semi-aquatic phosphogypsum 4.60-4.70 Carbonate-containing waste from soda production with a CaCO 3 content of at least 50%, pH value 9.0-11.0 6.90-8.20 Modified Foaming Additive 0.18-0.27 Water 23.30-25.10
RU2006104396/03A 2006-02-13 2006-02-13 Mix for foam concrete RU2305087C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
RU2006104396/03A RU2305087C1 (en) 2006-02-13 2006-02-13 Mix for foam concrete

Publications (1)

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RU2305087C1 true RU2305087C1 (en) 2007-08-27

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2955104A1 (en) * 2010-01-13 2011-07-15 Kerneos MATERIAL FOR THERMAL INSULATION AND METHOD FOR MANUFACTURING THE SAME
CN104406345A (en) * 2014-12-20 2015-03-11 苏州苏格尔电器有限公司 Food cold storage showcase
CN104457077A (en) * 2014-12-20 2015-03-25 苏州苏格尔电器有限公司 Ice maker

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2955104A1 (en) * 2010-01-13 2011-07-15 Kerneos MATERIAL FOR THERMAL INSULATION AND METHOD FOR MANUFACTURING THE SAME
WO2011086333A2 (en) 2010-01-13 2011-07-21 Kerneos Thermal insulation material and method for manufacturing same
US10160691B2 (en) 2010-01-13 2018-12-25 Kerneos Thermal insulation material and method for making the same
EP3792231A1 (en) 2010-01-13 2021-03-17 Kerneos Material for thermal insulation and method for manufacturing same
CN104406345A (en) * 2014-12-20 2015-03-11 苏州苏格尔电器有限公司 Food cold storage showcase
CN104457077A (en) * 2014-12-20 2015-03-25 苏州苏格尔电器有限公司 Ice maker

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Effective date: 20080214