SU1406126A1 - Expanding addition for slag-alkali binders - Google Patents

Abstract

The invention relates to the industry of building materials and can be used in the manufacture of concrete and mortar on slag - alkali in the living. The aim of the invention is to increase the degree of expansion and reduce water demand. Expanding additive for slag alkaline in the food contains, wt%: iron oxide 40-60 and magnesium sulfate 40-60. The additive is introduced both during milling and mixing with pre-crushed slag in the amount of 6-20% by weight of the binder. The additive provides a degree of expansion of 3.9-14.3 mm / m, water demand with a minimum consumption of an additive of 23.5-24, with a maximum of 26.5-28%, compressive strength of 79.5- 84.6 MPa and 63 , 4-68.5 MPa, respectively. 2 tab. i (/

Description

The invention relates to the industry of building materials and can be used in the manufacture of concrete and solutions on slag base in the living.

. The aim of the invention is to increase the degree of expansion and reduce water demand.

Example: Sulfuric acid magnesium is soluble in the alkaline solution used to trap the slag alkaline into a binder. Such a process leads to the reduction of water needs in the tenant. In addition, the component additives interact with the alkaline solution in the carrier according to the following scheme:

 + 14MgS04 + 2NaOH + SIHjO 2 NaMgiFej (S04) (OH) + + lOMg (OH) ,.

As a result of this interaction, crystalline neoplasms of the type of natural slavicite are formed; moreover, magnesium hydroxide is formed in significant quantities, which leads to an increase in the degree of expansion of the substance.

The resulting extender additive can be used in slag alkaline cements. The additive is introduced by grinding or by mixing the ground components into the slurry in the amount of 6-20%. Its amount depends on the required amount of expansion in the slurry.

The preparation of expanded ush, its cement based on the expanding additive

ki perform the following;

As the source components use h.ch. magnesium sulfate, magnesium oxide, sodium sulfate, iron oxide, as well as granulated blast furnace slag, the chemical composition of which is as follows,%:

CaO 49.3

SiO 38.4

 6,6

 0.2

MgO3.7

Zrz Else

Q 5

0

5 Q

0

with

0

The preparation of the extensible additive and the gustatory based on it is carried out in two ways.

The first way. The granulated blast furnace slag, iron oxide, magnesium sulphurous magnesium or (for the prototype) a mixture of magnesium oxide with sodium sulphate sodium mixed in the required amount are pre-ground to the specific surface. The content of the additive in the gnaw is 6.13 or 20%.

The second way. The blast-furnace granulated slag, iron oxide, magnesium sulphate or (for the prototype) a mixture of magnesium oxide with sulfuric acid and sodium are mixed in the required amount. The content of the additive in the gnaw is 6.13 or 20%. After that, the resulting mixture is subjected to dry grinding to a specific surface 3000. The compositions of this additive. And known are given in table. 1. The resulting shutter is sealed with a solution of sodium metosilicate with a density of 1.26 g / cm until the consistency of the dough of normal density is achieved. The determination of the consistency of the normal thickness test and the determination of the linear expansion of 4 4 16 cm samples from the normal density test are carried out according to known methods. The compressive strength is determined and samples are made for this. The solution-slag ratio in this case was 0.41. The test results are presented in table 1.

Claims (1)

In tab. Figure 2 shows the relative changes in the physicomechanical parameters of the proposed expanding additive to the slag alkaline and known additives for one percent. Invention Formula Expanding additive for slag alkaline in the food, including iron oxide and magnesium compound, which is different in order to increase the expansion and reduce water demand, it contains magnesium sulfate as a magnesium compound in the following ratio of components, wt. %: Iron oxide 40-6P Magnesium sulfate 40-60 Table 1 16 Mixing Pre-Grind Materials MgS04 40 17 Also Also 24.0 86.2 4.0 13 25.5 73.8 9.1 1,4,7 Joint grinding Prodolch: Table 1 table 2