RU2028278C1 - Method for preparation of binding agent - Google Patents

Abstract

FIELD: production of binding agents. SUBSTANCE: method for preparation of binding agent for concrete mix and mortar includes preliminary treatment of commercial lignosulfonates with product of hydrolysis of polyacrylonitrile by means of sodium hydroxide - preparation UNIFLOK at ratio by dry mass of 1: 0.01 and mixing of produced additive with portland cement clinker, gypsum and additionally introduced mineral additive in form of crystalline limestone containing not above 15% of marl and clay admixtures. Binding agent components, mas.%: portland cement clinker 74-79; gypsum 4-5; commercial lignosulfonates 0.05; product of alkali hydrolysis of polyacrylonitrile by sodium hydroxide - preparation UNIFLOK 0.0005; the balance, water. Plasticity of concrete mix is 10 cm, compression strength after 28 days of normal storage is up to 23.6 MPa. EFFECT: higher efficiency. 1 tbl

Description

 The invention relates to methods for the preparation of a binder for mortars and concrete mixtures.

 It is known that an additive — hydrolyzed polyacrylonitrile — an wastes from the production of K-9 nitron fiber in an amount of 0.2-0.56 wt.%, 16-21 wt.% Cement (1) is added to building cement mixtures.

 Closest to the claimed method according to the technical essence is a method of preparation of a binder, including joint grinding of Portland cement clinker, gypsum and additives from lignosulfonates of technical and amino-containing compounds in a ratio by weight (5-25): 1 (2).

 The disadvantage of this method is the relatively low ductility and strength of the mixture, as well as the high consumption of additives.

 The aim of the invention is to increase ductility, strength and reduce consumption of additives.

This is achieved by the fact that in the method of preparation of a binder, including the joint grinding of Portland cement clinker, gypsum, technical lignosulfonates and an organic nitrogen-containing compound, technical lignosulfonates are treated with an organic nitrogen-containing compound - an alkaline sodium hydroxide hydrolysis product of dry weight ratio of Uniloc 0: 1 in dry weight ratio: 01 and additionally enter crystalline limestone with a content of not more than 15% marl and clay impurities, and the ratio of the components of the binder with sets, wt.%:
Portland cement clinker 74-79 Gypsum 4-5
Crystalline limestone 15-20
Technical lignosulfonates 0.05
Specified preparation "Uniflock" 0.0005 Water Else.

.-CH

...The water-soluble preparation "Uniflock" used as an additive complies with TU 6-000203843-24-90 and has the following structural formula:

.-CH

...

Limestone rocks are used, containing up to 20% clay and marl impurities with a chemical composition, wt.%: SiO ₂ 0-15 Al ₂ O ₃ 0-6 Fe ₂ O ₃ 0-3 MgO 0-3 R ₂ O 0-2 SO ₃ 0-3 CaO 30-56 P.P.P. 30-44 is possible with the mandatory simultaneous introduction of a chemical complex additive of the specified composition into the cement composition, since without this additive after 60-90 days of normal storage of cement samples, the strength decreases and efflorescences appear on the surfaces.

-NH-

= 0/ и карбоксилатные /O =

ONa/ функциональные активные группы, взаимодействующие с активными функциональными сульфогруппами лигносульфонатов, асорбируют тяжелые фракции лигносульфонатов на длинномерных молекулах с большой массой, а свободные легкие светлые фракции ЛСТ проявляют себя как эффективный пластификатор и химический активатор твердения портландцемента. Активация твердения заявляемого цемента в ранние сроки позволяет снизить температурные режимы гидротермальной обработки изделий, расход паза и тепловой энергии и в теплых районах в весенне-летне-осенний период перейти на гелиообработку бетона и железобетона. Рекомендуемые известняки с примесями глинистых и мергелистых компонентов, считающиеся отходами производства, ранее не применялись как минеральные добавки в цементной промышленности и только наличие заявляемых модифицированных технических лигносульфонатов сделало возможным их использование.Polymer water-soluble products of alkaline hydrolysis of polyacrylonitrile (OPAN), containing nitrile (-C ≡ N), amide (-CONH ₂ ), imide / O =

-NH-

= 0 / and carboxylate / O =

ONa / functional active groups interacting with the active functional sulfogroups of lignosulfonates adsorb heavy fractions of lignosulfonates on long molecules with a large mass, and free light light fractions of LBF manifest themselves as an effective plasticizer and chemical activator of Portland cement hardening. Activation of hardening of the inventive cement in the early stages allows to reduce the temperature regimes of hydrothermal treatment of products, the consumption of groove and thermal energy, and in the warm areas in the spring-summer-autumn period to switch to the solar treatment of concrete and reinforced concrete. Recommended limestones with admixtures of clay and marl components, which are considered production waste, were not previously used as mineral additives in the cement industry and only the presence of the claimed modified technical lignosulfonates made it possible to use them.

)_n-
или препарат "К-14" формулы
...CH₂-

...-CH₂-

..-CH₂-

H₂-

Предусматривается также использование некондиционных известняковых пород (кристаллических, мергелей, галечников, ракушечников, пористых малопрочных) и отходов производства (отсевов от дробления известняка, внутренней кристаллической вскрыши известняковых месторождений), содержащих 0 - 20% глинистых и мергелистых примесей, состоящих из оксидов SiO₂, Al₂O₃, Fe₂O₃, CaO, MgO, SO₃, R₂O. 12 составов вяжущего - клинкер + гипс, клинкер + гипс + известняк, а также вяжущее с предлагаемыми добавками и свойства растворов и бетонов на его основе приведены в таблице.As the saponified polyacrylonitrile (OPAN), the K-9 preparation can also be used according to the technical specifications TU-6-06-17-02-83 of the formula:

) _n -
or the preparation "K-14" of the formula
... CH ₂ -

...- CH ₂ -

..- CH ₂ -

H ₂ -

The use of substandard limestone rocks (crystalline, marls, pebbles, limestone, porous low-strength) and production waste (screenings from crushing limestone, internal crystalline overburden of limestone deposits), containing 0 - 20% clay and marl impurities consisting of SiO ₂ oxides, are also envisaged. Al ₂ O ₃ , Fe ₂ O ₃ , CaO, MgO, SO ₃ , R ₂ O. 12 binder compositions - clinker + gypsum, clinker + gypsum + limestone, as well as the binder with the proposed additives and the properties of mortars and concrete based on it are given in the table e.

 A method of preparing a binder, as well as mortars and concrete based on it, is as follows.

They grind a binder consisting of clinker, gypsum, limestone, a complex additive - an aqueous solution of technical lignosulfonates modified with OPAN, the rest is water, to a residue of sieve N: 008 no more than 15%. Ready binder is tested according to the methods of GOST 130.1 ... 3-76 and GOST - 310.4-81. From a mixture of this binder and standard quartz sand in a 1: 3 ratio at w / c = 0.38, 12 beam samples of 4x4x416 cm are formed and tested after 3, 28, 90, 180 days of normal storage (n.h.), and 3 specimen-beams are subjected to TVO according to the regime: 2 h - holding, 3 h - raising the temperature to 85 ^о С, 6 h - isothermal mode at 85 ^о С, 2 h - cooling. Then the samples are redistributed and tested for strength in bending and compression. The results are shown in the table.

Using the prepared binder, concrete mixtures of the composition 1: 2.2: 3.5 = (limestone cement: sand: crushed stone) are made. Limestone crushed stone fr. 5 - 20 mm, quartz sand with M _to = 3.0. A water-binding ratio is taken to be necessary to obtain a plasticity of the mixture of 8-10 cm.The concrete mixture is placed on a vibrating platform in standard forms for 10 x 10 x 10 cm cubes, which are then stored under normal conditions and tested for 7, 28, 60 days and for compressive strength. 6 cubic samples are molded and then subjected to TBT under the indicated regime, and then tested after steaming and after 28 days for compressive strength. The results are shown in the table.

Claims (1)

METHOD FOR PREPARING A BINDER for mortar and concrete mix by co-grinding Portland cement clinker, gypsum, technical lignosulfonates and an organic nitrogen-containing compound, characterized in that, in order to increase the plasticity of the concrete mixture, material strength and reduce the consumption of additives, technical lignosulfonates are treated with organic nitrogen the product of alkaline hydrolysis with sodium hydroxide polyacrylonitrile - the preparation "Uniflock" with a ratio by dry weight of 1: 0.01 and additional Crystalline limestone with a content of not more than 15% marl and clay impurities is added, the ratio of the components of the binder is, wt.%:
Portland cement clinker - 74 - 79
Gypsum - 4 - 5
Crystalline limestone - 15 - 20
Technical lignosulfonates - 0.05
The specified drug "Uniflock" - 0,0005
Water - Else

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