SU621652A1 - Concrete mix - Google Patents

Description

(54)

CONCRETE MIXTURE

one

The invention relates to the industry of building materials and can be used for the manufacture of products and structures of concrete resistant to sulfite media.

Concrete mixtures of crushed carbonate rocks and natural quartz sand are known, which do not have high sulfate resistance ij.

A concrete mixture is also known, including middle aluminate Portland cement, crushed stone, limestone sand and water at a ratio of cement and sand 1; 3 and a water-cement ratio equal to 0.46-0.51 2.

A disadvantage of the known concrete mix is the relatively low sulphate resistance.

The aim of the invention is to increase the sulphate resistance of concrete.

The goal is achieved by the fact that the concrete mixture, including Portland cement, crushed stone, lime sand and water, contains as a lime sand a mixture of aragonite sand with augite sand and / or albite in a ratio of 1.0: 0.62, 0 - in the following ratio of components of the concrete mix, wt.%:

14-19

Portland cement Rubble 46-48

Aragonite sand mixture with augite and / or albite sand

20-36 Remaining Water

Example. Prepared t concrete

ao mixture of compositions presented in table. one.

Components

Middle aluminate portland cement

Rubble

Aragonite sand mixture with augite sand with an average Isl ratio

Water

The sulphate resistance of concrete samples is determined according to GOST 4798-69 when the content of sulfate ions in a corrosive environment is 4 g / l.

Table 2 shows the results of tests of concrete of optimal composition 2 according to the invention and proto

type

table 2

The coefficient of sulfate resistance after storage in a sulfate medium for

6 months

May 4th

0.82

0.90 0.96 0.98

; As is evident from these tables, the concrete composition according to the invention has a significantly higher sulfate resistance, exceeding this indicator for known compositions by more than 15%.

Table 1

Coflep) components,% in compositions

18 46

14

47

thirty

thirty

Claims (2)

1. Khutortsev G, M Investigation of the possibility of using carbonate crushed stone of reduced strength as a placeholder for concrete paving slabs. Proceedings of Akad.kom.khoz ystva, them. KD Pamfilova, vol. 124, M., 1976, p. 16-23. . 2. Arav PkH. Increase sulphate resistance of concrete using crushed carbonate sands. - Building materials, a, 976, 10, p. 8-9.