SU653228A1 - Binder - Google Patents

Description

(54) BINDING

The invention relates to chemical technology in the form of a substance, namely, the development of a substance containing portland cement and an additive that is introduced in order to provide an effect of self-stressing.

Portland cement-based tinting agents are known to be used as stresses, which involve the use of clinker containing an expanding component, or an introduction to a conventional cementing additive with an expanding component.

High quality calcium aluminates in a mixture with calcium sulphate or specimens of some oxides and salts with lime are added as expanding additives, which cause expansion of Portland cement in the early period and do not provide the effect of self-pressure l.

Of those known to be used as stresses and expanding, the one closest to the proposed composition is the paste, containing 85-95% of portland cement and 5-15% of expanding additive.

However, the expansion of these in the jugs is insignificant; it occurs during the first hours of hydration and does not provide self-stressing in the system. In addition, the cost per person: increases due to the use of valuable natural raw materials of kaolin.

The invention is designed to provide a self-boosting effect.

For this purpose, an alloy comprising 64-71 wt. % phosphogypsum, or fluorohypsum, or borogypsa with 29-36 weight. % lime or magnesium oxide in the following ratio of components in the binder, weight. %:

Portland Cement 85-99,5

Additive0,5-15

To obtain an alloy, the finished mixtures from the specified number of components.

-j

i jf

Claims (2)

653228 The granules of the mixtures were burned at IIOO-135O C. The obtained alloys were milled to obtain a powder with a specific surface of 25OO-350O cMVr, which was then introduced into portlanae. The results of determining the linear changes of samples during water hardening for 28 days are given in the tables. The suggested substance provides self-stress depending on the size of the additive from 2O up to 58 kgf / cm. The qualitative and quantitative composition of the additive was taken in accordance with the test results of the proposed ground gear. Claims of the Invention A stinging comprising Portland cement and an additive, characterized in that, in order to ensure the effect of self-stress, it contains as an additive an alloy of 64-71% by weight of phosphogypsum, or fluoro gypsum, or borogips with 29-36% weight. % lime or magnesia in the following ratio of components in the slurry, wt. %: Portland Cement 85-99.5 Additive0.5-15 Sources of information taken into account during the examination 1. US Patent No. 3801339, cl. 106-97, 1974. 2. Butt, Yu. M., et al. Technologists. M., Higher School, 1965, p. 537.