SU1693267A1 - Packing mortar - Google Patents

Abstract

The invention relates to mining and m. used for laying the developed space in the development of deposits by underground method. The purpose of the invention is to increase the strength of the erected filling mass and eliminate its volume shrinkage by increasing the rate of hydration and hardening and the expanding properties of the filling solution. For this, the filling solution contains a cementless, inert aggregate, a lime-containing additive as a curing agent and water. A binary mixture (BS) of the equilibrium parts of the ash and slag waste of thermal power plants (HPP) and dust — entrainment (PU) of cement kilns was introduced into the solution as a cementless composition. As an additive, the non-explosive destructive agent LDC-1 is used. The ratio of components in solution is as follows, wt%: BS of the equilibrium ash-slag waste of TPP and PU 20-27; NRS-1 3-5; inert aggregate 50-60; water the rest. Using the solution will increase the strength of the monolith twice, eliminate bulk shrinkage and create resistance to rock pressure without destroying the monolith 2 table.

Description

The invention relates to the mining and quarrying industry, namely to the production of filling solutions, and can be used to lay the mined-out spaces in the development of mineral deposits by the underground method to fill previously formed voids.

The purpose of the invention is to increase the strength of the erected backfill array and eliminate its bulk shrinkage by increasing the rate of hydration and hardening and the expanding properties of the solution.

For experimental verification of this solution, filling mixtures are prepared (Tables 1 and 2). For this purpose, ground fuel ash dumps of thermal power plants, dust, captured by electrofilters of cement kilns of Bepgorod Cement Plant, tailings of ferrous quartzite enrichment plant (RP) No. 2 powder powder are used.

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ND VI

HPC-1 co-substance, tap water.

The stacking solutions are prepared with a different mass ratio of the slurry: aggregate (1: 1-1: 3) and the concentration of the substance HPC-1 (up to 10 wt.%).

To do this, water is added to the dosed powdered components at the rate of achieving a mixture of a moving consistency corresponding to a standard 120–150 mm draft of the standard cone of StroCNIL, and the mixture is thoroughly mixed in a paddle mixer for 5 minutes. The resulting mass is a filling solution.

Data on the material composition of the solutions and the properties of the hardened bookmark are given in Tables 1 and 2.

To compare the activating and expanding effects of the substance LDC-1 and quicklime, five sets of samples (No. 4-8) of filling solutions with the addition of CaO, are also prepared.

From the above data it can be seen that the plates without the addition of HPC-1 and with the addition of it in an amount of up to 2 wt.% Are subject to volume shrinkage (compositions 1-3, 9-10).

The addition of 4-8 wt.% Quicklime increases the strength of the bookmark from 3.5 to 6.1 MPa, i.e. by only 2.6 MPa (No. 2 and No. 7), and its broadening effect is not enough (from -0.7 to + 0.17%) to counter the compression. A further increase in the amount of lime does not improve these characteristics (Ne 8).

The addition of 3-5 wt.% LDC-1 (No. 12-18) significantly increases the strength characteristics of the backfill array (by 10 MPa compared to the known Ns 25), by 10.2 MPa compared to the additive-free solution (No. 1) and 9.2 MPa compared with the addition of CaO (Ns 7) and gives it the ability to expand.

A further increase in the number of LDC-1 in the mixture leads to a decrease in the strength of the backfill array (No. 21-24). This is due to the occurrence of significant internal expansion stresses, leading to structural failure, cracking and weakening of the backfill.

A composition with an exorbitant (elevated) content in the slant (No. 18) does not lead to an improvement in the properties of the bookmark, and a decrease in the content in the slider significantly deteriorates its strength characteristics (No. 20).

The increased content of inert aggregate (No. 11) results in a thick, sedentary solution, which makes it difficult to transport it through pipelines to the place of filling works, its strength characteristics are also inferior to optimal compositions.

The use of this filling solution allows to increase the strength of the monolith by about two times compared to the known (Table 2, from 4.75 to 8.8-15.3 MPa), eliminate bulk shrinkage, and create resistance to rock pressure without destroying the monolith.

Claims (1)

Claims of the Invention A stocking solution containing a cement-free, stagnant, inert aggregate, lime-containing additive as a curing activator and water, characterized in that, in order to increase the strength of the built-up filling mass and eliminate its bulk shrinkage by increasing the rate of hydration and hardening the broadening properties of the solution, it contains as a cement-free, solid binary mixture of the equilibrium parts of the ash and slag waste of thermal power plants (HPP) and dust-dust of cement kilns, and as an additive, non-explosive destructive agent LDC-1 in the following ratio of components in solution, wt.%: Binary mixture of equilibrium parts of ash and slag TPP and dust-burning cement furnaces 20-27 Non-explosive destructive agent NPC-13-5 Inert filler 50-60 Water Else