SU688650A1 - Filling mixture composition - Google Patents

Description

The invention relates to the field of mining and can be used in the underground mining of mineral deposits with the laying of the goaf. The composition of the filling mixture is known, including cement, sand and water 1. The disadvantage of such a mixture is that it has a high water separation, it is difficult to transport, which makes it difficult to transport it through pipes. In addition, the known composition of the filling mixture 2, containing the following components, wt. %: 10.0-14.6 Cement Sand 71.0-75.0 Waste from the production of phthalic anhydride (active0, 4-0.6 by addition) Rest The indicated composition also has water separation, stratification and has a low compressive strength of the sample. The purpose of the present invention is to reduce water separation and delamination. And 5 10 15 20 25 - 30 mixture capacity and increase bookmark strength. This is achieved by the fact that, as an active additive, the composition contains the by-products of asbestos-cement production with the following ratio of components, weight. %: Cement14-15 Sand55-66 Asbestos-cement by-products byproducts 2-10 Water Else. In this case, the optimum is the composition, including, weight. %: cement 14.3, sand 59.5, by-products of asbestos-cement production 6.7, water 19.5. To determine the optimal composition, 5 mixtures were prepared with the same mobility of 10 cm and containing asbestos-cement production byproducts, in% by weight, respectively: 10.0; 6.7; 2.0; 0.5 and 0. The cement consumption was constant and equal to 300 kg per 1 m of solution (14.3%). The total amount of sand and water added up to 100%.

When testing the mixture, the cement of the Yashki cement plant, sand obtained by sieving the gravel-sand mixture of the Tomsk deposit, by-products of the asbestos cement Prozododstvo of the Yashkinsky plant and tap water were used.

Properties of applied components.

Cement of mark “400, fineness of grinding — residue on sieve No. 008-13%, setting time — beginning 50 minutes, end 5 hours and 40 minutes.

The sand contained clay, dusty impurities 4%, bulk weight 1.6 g / slg density 2.4. The grain composition of sand is given in table. one.

Table 1

Asbestos-Cement production byproducts (additive active) - bulk density in loose state 320 kg / m, density 2.3 g / cm, particle content less than 0 .14 mm - 68%, less than 0.071 mm - 53%. The chemical composition of by-products of asbestos cement production is given in table 2.

Table 2 The solution was prepared by mixing; no components for 5 min. The mobility was determined by plunging into a solution of the cone Stroy DNIL. Water separation was determined by measuring the volume of a layer of water over the mixture for a cut of 1.0 h after placing it in vessel-30

bone 500 ml and was calculated by the formula:

5 V

where BZ is the initial volume of the mixture, BI is the volume of water released, see

The delamination coefficient was determined by the method of GOST 5802-51 and was estimated by the difference of the immersion depth of the StroyCNIL cone in the mortar mixture located in the lower and upper parts of the device after vibration. Vibration time 15s. The compressive strength of the solutions was determined by testing samples — cubes with rib sizes 7 x 7 x 7 cm in the BK.K-200 hydraulic press. The data presented in table 3 show the composition properties of the filling mixture.

Minimum water separation and separation rate "and, characterizes the best transportability of the mixture through pipes over long distances, which contributes to obtaining a more uniform in structure and other properties of the hardened backfill.

The use in industry of this composition of the mixture to fill the mine workings will allow utilizing the by-products of asbestos-cement production and improving the quality of filling operations.

Claims (2)

1. Kravchenko, V.P., et al. The laying of chambers with a sand-cement mortar at the mine, Mining Journal, 1968, No. 7, with. 30-31. 2. USSR author's certificate number 619678, cl. E 21 F 15/00, 1973 (prototype).