SU1219550A1 - Method of preparing concrete mix - Google Patents

Description

The invention relates to the production of building materials and can be used in the preparation of concrete for the construction of products and structures.

The purpose of the invention is to increase the strength of concrete and frost resistance.

The method of preparation of concrete mixture of cement, small and large. The aggregates include the treatment of the aggregates and the prepared concrete mix with an aqueous solution of a superplasticizer, while in the process of processing the aggregates, liquid glass is introduced into an aqueous solution of the superplasticizer in an amount of 0.04–0.1% by weight of cement. Moreover, high-modulus liquid glass is used with a density of 1.3 g / cm, and superplasticizers of grades C-31 and

The method is carried out as follows.

For the preparation of concrete mix, cement-brand MbOO in the amount of 500 kg, crushed granite with a grain size of 5-2 mm in an amount of 1280 kg, quartz sand with a grain size module Mts, p 2.35 in an amount of 600 kg and mixing water are used per 1 m of concrete. -. From the hour

Yokazateli

The method of preparation of concrete mix

500 500 500 500

600 600 600 600

1280 1280 1280 1280

130 130 130 130

 These groundwaters (30 l) prepare an aqueous solution of a superplasticizer at a rate of 0.3% by weight of cement {1–5 kg), to which 15 liters of an aqueous solution of liquid glass are added at a rate of 0.7% by weight of cement (355 kg). The total mixture of solutions is thus 45 liters.

In the remaining part of the gate water (85 liters), a superplasticizer is added in an amount of 0.3% by weight of cement. After preparation of the components, a blended amount of fine (sand) and coarse (crushed stone) aggregates is loaded into the mixer. During the mixing process, a mixture of the solution of superplasticizer and liquid glass is fed. Then the cement and the rest of the mixing water with the addition of superplasticizer are added. The total concrete mix preparation cycle is 2-3 minutes. The finished concrete mix is used to form precast and monolithic reinforced concrete products and structures. Samples are tested according to relevant State Standards.

The compositions of the proposed and known concrete mixtures and the properties of products from under 5 (: are given in the table

Superplasticizer consumption,.% Of cement mass

for the processing of fine and coarse aggregates before cooking. concrete mixture

C-3

10-03

when introduced into the concrete mix on the stage of mixing components

C-310-03

Consumption of liquid glass for additional processing of small and large aggregate,% by weight of cement

Concrete properties in samples at the age of 28 days. normal storage

compressive strength, MPa122 96

prismatic strength, MPa

102.5 73.9

7, 3 4,6

1000 820

20 20

12195504

Table continuation

0.35

0.3

0.35

0.3

0.07 0.04

0.10

78 59

3.9 600

20

j.12195504

From the data presented in the tab-78 Mlla in concrete, obtained by izlitsa, it is clear that the strength of their own way, respectively

The properties of the proposed concrete age-increase frost resistance up to 820 up to 96-132.4 MPa for compression vs, 1200 cycles versus 600 cycles.

Claims (1)

METHOD FOR PREPARING CONCRETE MIX from cement, fine and coarse aggregates, including processing aggregates' and the prepared concrete mix with an aqueous solution of su-, perplasticizer, t ols and the same with the fact that, in order to increase the strength of concrete and frost resistance in superplasticizer treatment solution fillers _h waterglass administered in an amount of 0.04 - 0.1% by weight of cement. SU, “1219550 water of mixing water (30 l) prepare an aqueous solution of superplasticizer with a flow rate of 0.3% by weight of cement (1.5 kg), to which add 15 l of an aqueous 5th solution of water glass with a flow rate of 0.7% by weight of cement (3,5kg). The total mixture of solutions is thus 45 liters. Superplasticizer in the amount of 0.3% by weight of cement is introduced into the remaining mixing water (85 L). After preparation of the components, a metered amount of fine (sand) and 15 large (crushed stone) aggregates are loaded into the concrete mixer. In the process of mixing serves a mixture of a solution of superplasticizer and liquid glass ·. Then add cement and the rest of the mixing water 20 with the addition of superplasticizer. The total cycle for preparing the concrete mixture is 2-3 minutes. The ready-mixed concrete mixture is used for forming precast and monolithic reinforced concrete25 ton products and structures. Samples are tested according to relevant GOSTs. The compositions of the proposed and known concrete mixtures and properties of 30 of them are given in the table "