Additive for construction mixes

FIELD: construction.

SUBSTANCE: additive comprises the following components, wt %: microorganisms of Leuconostoc mesenteroides type cultivated on a synthetic nutrient medium 0.5-2.7; microquartz 97.3-99.5.

EFFECT: increased mobility of a construction mix and concrete strength.

2 tbl

 

The invention relates to construction materials, namely, additives for mortars, and can be used to obtain mortars and concretes with the release of the designs, products, parts, performance plastering, as in the construction industry and in the construction of housing assignment.

Known various additives, represented as individual substances and complexes of chemical compounds introduced with the aim of improving performance (Batrakov VG Modified concretes. Theory and practice. VG Laborers. M: Technopark, 1998. - P.3-4, - S-133, - S-284, - S-472, - S-631).

The disadvantages of the known additives are relatively low mobility of the mixture and the strength of concrete.

Known mixture of cement binder includes cement, aggregate, water and additives, such as calcium chloride (guidance on the use of chemical additives in concrete / NIIZHB of Gosstroy of the USSR. - M.: stroiizdat, 1980. P.6, P.24).

The disadvantage of the mixture is the development of reinforcement corrosion, efflorescence on the surface due to the introduction of calcium chloride.

The closest to the technical nature of the claimed invention is a method for additives to the concrete mix by culturing in a nutrient medium of the microorganisms, as bacteria which take the form of Leucnostoc mesenteroides. The cultivation is carried out on synthetic nutrient medium with the addition of oleic acid in 24-48 hours at a temperature of 23-25°C in catalogna mode (EN 2133239, IPC C04B 28/02, C04B 24/00, C04B 111/20, publ. 20.07.1999).

The disadvantages mentioned in the way of additives include low-thinning effect and the decrease in strength of the finished material at elevated its consumption.

The technical result is to increase the mobility of mortars and concrete strength.

The invention consists in that in addition to mixes including microorganisms of the species Leuconostoc mesenteroides, cultivated on synthetic nutrient medium, optionally enter microcars, in the following ratio, wt.%;

Microorganisms of the species Leuconostoc mesenteroides,
cultivated on synthetic nutrient medium05-27
Microcars97,3-99,5

The genus Leuconostoc is included in the tribe Streptococcaceae family Lactobacillaceae (determinant bacteria Berga). The genus Leuconostoc includes "a typical representative" - Leuconostoc mesenteroides and 8 "secondary" species Leuconostoc pseudomesenteroides, Leuconostoc lactis, Leuconostoc citreum, Leuconostoc gelidum, Leuconostoc carnosum, Leuconostc fallax, Leuconostoc argentinum and Leuconostoc oenos. Leuconostoc belong to gram-positive bacteria, are microaerophilic or facultative anaerobes, form chains, energy metabolism proceeds by type of fermentation, require complex nutrient media. Members of the genus Leuconostoc refer to heterofermentative microorganisms. In practice, used in the manufacture of dairy products, wine and are not pathogens. In addition, Leuconostoc mesenteroides fermented sauerkraut, silage and juice for sugar production. However, they cause damage to the sugar industry, forming mucus and gums, foul tanks and pipelines.

Microcars - mineral powder of silicon oxide, crystalline form (SiO2- 96,6%) with a high value of specific surface area (S=224,1 m2/kg) and the true density ρ=2560 kg/m3.

Supplement the proposed composition was prepared as follows. The synthetic nutrient medium containing potassium chloride 0.1 g of magnesium sulfate, 0.1 g of potassium phosphate one-deputizing - 1.0 g, sodium phosphate disubstituted 2.5 g of ammonium chloride, 0.5 g, salt Mora 0.01 g, paraaminobenzoic acid, 0.05 g, peptone - 0.2 g sugar - 100 g, pyrogen-free water (water for injection) - 1000 ml oleic acid and 1.4 ml sterilized. To obtain a culture liquid of microorganisms of the species Leuconostoc mesenteroides grown in the flask with sinteticheskoi nutrient medium in catalogna mode (160 rpm). Seeding synthetic nutrient medium made from: 100 ml medium one tube of seed material. The duration of the cultivation period is 24-48 hours at a temperature of 23-25°C. Then the culture fluid combine microquasar. The compositions of the additives shown in table 1.

The additive is introduced during the preparation of fine-grained concrete mix composition: cement: sand 1:3 with water-cement ratio equal to 0.53, and mix in the mixer enforcement action. The mobility of the mixture is measured by immersion of the cone on the device STRASZNY. From the concrete mixture is formed into samples of size 4×4×16 cm, then put them in a cell with normal curing for 28 days. After this time determine the strength of concrete Flexural and compression. The results are shown in table 2.

Microcars, having a developed surface, adsorb compounds, which is a typical surfactants with its properties, from the culture fluid. Resulting in a negative processes for formulations that do not contain microcars, greatly reduced. Moreover, as a result of synergies increase the positive effects of an additive which improves the mobility of mortars and concrete strength.

Additive for construction compounds is th

Table 1
ComponentsThe compositions of the additive for mortars, mass%
12345the placeholder
Microorganisms of the species Leuconostoc mesenteroides cultivated on synthetic nutrient mediumof 5.42,770,50,03100,0
Microcars94,697,398,099,5of 99.97-

Table 2
PropertiesIndicators for compounds
12345 the placeholder
Dip cone, cma 4.96,75,2the 3.82,22,5
The tensile strength in bending, MPathe 3.85,9of 5.44,84,44,8
The limit of compressive strength, MPa7,716,514,712,611,310,9

Additive for mortars, including microorganisms of the species Leuconostoc mesenteroides, cultivated on synthetic nutrient medium, characterized in that it further impose microcars, in the following ratio, wt.%:

Microorganisms of the species Leuconostoc mesenteroides,
cultivated on synthetic nutrient medium0,5-2,7
Microcars97,3-99,5



 

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