SU692798A1 - Raw mixture for preparing cellular concrete - Google Patents

Description

(54) RAW MATERIAL MIXTURES FOR THE PRODUCTION OF CELLULAR

CONCRETE.

is epoxy resin content. In contrast to the known composition, the proposed raw mixture together of the mineral aggregate contains a filler - a polymeric substance.

By nature, the polymeric substance quickly hardens and gains strength - in the presence of hardeners and accelerators, both in normal and in an environment with elevated temperature. The composition contains an additive of carbonate, an alkali metal, as an accelerator for the raw mixture. This additive reduces the shrinkage deformations that occur during hardening, and thereby improves the quality of the finished product.

Since lime is extinguished during slaking, it emits a large amount of heat, its content in the raw material mix provides the necessary conditions for simultaneous hardening over the whole mass of cellular concrete, which helps to improve its properties. .

According to the proposed compositions, samples of cellular concrete with a bulk weight of 370, 600, 850 kg were used according to the technology described in the examples.

Example 1. In the manufacture of the raw material mixture on epoxy resin, the following materials were used: quicklime, activity of 80%, non-quenched grains, quenching temperature, quenching rate 2-4 min; water insoluble epoxy resin E-40 (MRTU UHP 295-59) -, molecular weight less than 600, viscosity according to OT-4 at 25-60 s, content of epoxy groups 16-21%; hardener - LBS bakelite varnish (GOST 901-71). is a solution of phenol-formaldehyde resin of the rezol type in ethyl alcohol, has a viscosity at 20 ° C not more than 145-465 cP, a time for Leatinization on a tile at 150 C in the range of 50-110 s, contains resins at least 50-60%; carbonate salt alkali metal aluminum powder; clean drinking water.

Three components of the raw mix are prepared from the described components, following the sequence.

B92798

The required amount of epoxy resin E-40 and lime mortar, previously obtained by dissolving 1/4 part of the calculated mass of lime-boil in the required amount of water, is poured into the prepared form and mixed to a uniform consistency. Then, bakelite varnish, previously mixed with aluminum powder, an aqueous solution of K2CP5 is poured alternately into the resulting mass and mixed again until homogeneous. The rest of the ground quicklime is poured into the resulting aqueous dispersion of the polymer substance and mixed until the cellular structure is formed, after which the cellular mass is heat treated. Konkreg.nye compositions are given in table.1.

Example 2. In the manufacture of the raw material mixture on the urea-formaldehyde resin, the following materials were used: quick hammer of lime, activity 60%; non-quenched grains - 27%; EO quenching temperature, quenching rate 4 min .; water-soluble urea-formaldehyde resin MF-19-62 containing a dry composition of 65-70%; and free formaldehyde 1.2%; viability of the solution with the addition of 1% chlorine ammonium for at least 7 hours; carbonate salt alkali metal aluminum powder; clean drinking water.

Three components of the raw mix are prepared from the above described components, following the following sequence.

In the prepared form pour the required amount of urea-formaldehyde resin, the addition of an aqueous solution of K2CO3, hardener and mix until a uniform consistency. Into the resulting mass pour the calculated amount of aluminum powder, mix until a uniform color appears, then load the calculated amount of fine ground quicklime and finally mix until the cellular structure is formed, after which the cellular mass is heat treated.

Specific formulations are given in table.1.