SU698941A1 - Method of preparing building mortar - Google Patents

Description

(54) CONSTRUCTION SOLUTION SUCSUB

one

The invention relates to the technology of cement mortars and concrete, to methods of preparing mortars for cementation of voids and cracks in concrete and reinforced concrete structures.

A known method of preparing solutions by mixing cement with water containing plasticizing agents. Synthetic tanning agent and dibutyl phthalate, taken respectively in an amount of 0.1-0.5% and 0.2-0.4% by weight of cement 1, are introduced into the mixing water.

There is also known a method for preparing a concrete mix by tarring cement with ash and mixing water 2. This method is the closest in technical essence and the achieved result to the proposed method.

A disadvantage of the known methods is that they do not accelerate the hardening process and increase the strength of the cement stone.

The aim of the invention is to accelerate the hardening and increase the strength of the cement stone.

This is achieved by the fact that the method of preparing mortar by mixing cement with hard water and mixing water involves mixing cement with ash in a ratio of 7-9: 1-3 and pre-introducing 0.1-0.3% of ash in water into mixing water. waiting

In the cement-ash in the holding area, from 10 to 30% of fly ash is kept; the introduction of the same ash into the mixing water with a quantity of 0.1-0.4% of the weight of the holding agent leads to significant changes in the kinetics of structure formation and increase the strength of the hardened material . This is due not only to an increase in additional crystallization centers (they have been introduced sufficiently with a large addition of fly ash), but also because the low doses of fly ash introduced into the mixing water dramatically change the structural and mechanical properties of dilute aqueous solutions (water

5 shutter), affected. on the kinetics of structure formation of cement-aspolar solvents over time.

This method of preparing cement mortars is simple and differs from

This is due to the fact that a small addition of fly ash with stirring for 1-1.5 minutes is introduced into the water of the paddle. The mixing of the mixture consisting of cement, ash and water prepared by the above method is carried out until a homogeneous mass is obtained for 56 minutes, i.e. the same amount of solution as is usual for cement-ash solutions.

An example of the implementation of the technology of preparation.

The dry mixture of cement and fly ash is shut off with water and stirred for 5 minutes (composition 1), the dry mix of cement with ash is shut down with water mixed for 1.5 minutes with another 0.1-0.4% fly ash , and stirred for 5 minutes (compositions 2, 3, 4, 5) (see table.).