SU1143717A1 - Composite addition to cement and method of preparing same - Google Patents

Description

I 1 The invention relates to the preparation of cements J, namely, the quality of complex additives for cement and (methods for their preparation to improve the properties of cement materials, such as concretes, mortars. The known complex additive ij, in wt.%: Calcium Nitrate, Calcium Nitrate 1.5 -2.5 Sulphite-alcohol bard0,1-0,15 Sodium nitrite 1.0-2.0 However, such an additive will not sufficiently increase the activity of the cement.The complex additive 2 to the cement mixtures is known, containing, by weight, Sulphite-yeast beer 1.5 -5.0 Soap stock vegetable oil. 1.0-3.3 Sodium hydroxide and potassium. 0,002-0,01 Sodium nitrite 45-55 Water Remaining The closest to the invention is the method consisting in preparing an aqueous solution of a sulfite-yeast brew and gradually combining it with LIA or sodium hydroxide, preliminarily heated to 45-50 ° C soapstock and then sodium nitrite Z. The closest additive to the proposed technical essence and the achieved result is a colecive additive .3 to the cement, including, by wt.%: Distillation of synthetic fatty acids1, 2-5,3 Sulfite-d burned salt 0.7-2.9 Salt of inorganic acid 16.4-30.2 Ground dihydrate gypsum 65.7-77.1 The disadvantages of the known complex of the additive and its preparation are the low subtleties of the cement slab and the hydrophobicity, as well as the lack of auto-activation cement during transportation and storage. The purpose of the invention is to increase the grindiness of the bone, the hydrophobicity and the degree of autoactivation of cement during transportation and storage. 72 The goal is achieved by the fact that a complex additive to cement, including soap stock of vegetable oil, sodium nitrite, mineral filler and water, additionally contains fatty tar, and as a mineral filler is ground blast-furnace slag in the following ratio of components, wt.%: Vegetable juice stock oils 2.5-4.6 Sodium nitrite 36-50 Fat tar5-9.2 Ground blast-furnace slag25-36.0 Water Remaining According to the method of preparing the complex additive, which includes heating the soap stock of vegetable oil to. 45-50 ° C and combining with sodium nitrite, the vegetable oil soapstock are mixed with stirring for 2-3 minutes with warm fatty tar to the same temperature, and then sodium nitrite aqueous solution and ground blast furnace slag are added to the resulting mixture and mixed until homogeneous consistency, after which they are agglomerated into briquettes and cured at 60-90 C. Fat tar is a by-product of soap production produced by the distillation of industrial animal fats. The fatty tar contains fatty acids of C fraction and more (oleic, stearic, etc.). The acidic amount of fatty tar is in the range of 103.5-131 mg KOH / H. In the proposed composition of the additive use blast furnace slag. Karaganda Metallurgical Combine of chemical composition; %: SiO 35.37; CaO 39.6G, AljO 13.97; MIO 6.98; BaO 1.24; MpO 0.98; TiOe 0.6i; 6.67. The compositions of the proposed complex, additives and known are in Table. 1. The compositions of the proposed additive complex are prepared in a manner that is convenient. Ingredients No. 1. Soap stock and fatty tar are heated to t 50 ° C, then they are mixed for 3 minutes with an increase in the composition of the additive of fatty tar, the mixing time is increased). The resulting mixture is combined with sodium nitrite and ground blast-furnace slag until a homogeneous mass is obtained (15 min), and then the plastic press briquettes are agglomerated. that cure at t for 1 hour.

Composition No. 2. Heat up t ASC soap stock and fatty tar, then mix them for 2.5 minutes. The mixture is combined with sodium nitrite and ground blast-furnace slag to obtain a homogeneous mass (15 minutes), and then agglomerate the briquettes by plastic pressing, which are cured at t 70 With in 1-1,5 hours

Composition No. 3. Heat the soap stock and fatty tar to t 45 ° C, then mixing them for 2 minutes, mix the resulting mixture with sodium nitrite and ground domain slag to obtain a homogeneous mass (15 minutes). After that, the briquettes agglomerate by plastic pressing, which are cured at t into. for 1.5 hours

The resulting briquettes are subjected to joint grinding in a ball mill

with cement clinker taken from the same batch at the Novokaraganda cement plant. The dosage of additives in the form of a briquette is equal to 2% by weight of the clinker.

Comparative physicomechanical properties of cement are given in table. 2

The test results showed that the cement with the proposed additive showed signs of autoactivation, i.e. a spontaneous increase in cement activity is observed (from 44.2 46, 7 to 46-48.5 MPa). Cement made with a known additive does not detect the phenomenon of auto-activation, apparently due to the fact that hydrophilizing functional groups are contained in the composition of the known complex additive along with the hydrophobic agents. py, namely sulphite-yeast brew.

The invention can be used in the production of cement in technology with high physical and technical properties.

Table 1

Sulfite yeast brew

Soapstock rastitel2, 5 foot oil

Sodium or potassium hydroxide

Nitrite sodium fatty tar

Ground blast furnace slag.

 Vat residues of synthetic fatty

acids

Ground bivot

Gypsum Water

1.8

4.6

3.3

20.3

36 5

25

3.5

71, l

29.4 3.3

Cement activity

Sha

Tbit on sieve

№ 008,%

Sample pa hydrophobicity, the time of existence of a drop of water on a sample of cement, min,

The degree of auto-activation, MPa47.3

Table 2

37.2

6,844,2

41,8

9.6

12

A drop of water is absorbed almost instantly.

5.1

40.4

25.5

46.0

48.5

Claims (2)

A complex additive to cement, including co-stock of vegetable oil, sodium nitrite, mineral filler and water, with the fact that, in order to increase the fineness of grinding, hydrophobicity and degree of autoactivation of cement during transportation and storage , it additionally contains fat tar, and ground blast furnace slag as a mineral filler in the following ratio of components, May.%: Soap of vegetable oil Sodium nitrite Tar oil Ground blast furnace slag Water 2.5-4.6 36.0-50.0 5.0-9.2 25.0-36.0 Rest 2. A method of preparing a complex additive, including heating the sap drain of vegetable oil to 45-50 ° C and combining with sodium nitrite, characterized in that the sapstock of vegetable oil is combined with stirring for 2-3 minutes with the tar oil heated to the same temperature, and then portioned aqueous sodium nitrite solution and ground blast furnace slag are added to the resulting mixture and mixed until a homogeneous consistency, after which they are agglomerated into briquettes and cured at 60-90 ° С .