SU1418320A1 - Concrete mix - Google Patents

Abstract

The invention relates to the building materials industry and can be used in the manufacture of lightweight, heat-resistant concrete on slag base in the sheeting. The aim of the invention is to reduce shrinkage and increase heat resistance and strength at 300-1000 ° C. The concrete mixture contains, wt%: a mixture of highly basic converter and medium carbon ferrochrome fine dispersed slags in the ratio (3.29-15.67): 1 30-50i low-modulus liquid glass (in terms of) 5-15j expanded pearlite or vermiculite sand - the rest . The mixture provides lipid shrinkage of 0.10-0.18%, bulk weight 650-730 kg / m, compressive strength after steaming 7.0-9.3 MPa, residual strength at 300-1000 C 100-108 and 140 -161.9%, heat resistance

Description

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The invention relates to industrial laziness of building materials and can be used in the manufacture of lightweight, heat-resistant concrete on a slag base in the sheeting.

The purpose of the invention is to reduce shrinkage, increase heat resistance and strength at 300-1000 ° C,

PRI me R. The following materials are used: high-base converter (steel-smelting) slag (modulus of basicity 2), ferrochromic fredneuglerodisty pshak, low-modulus water glass (silicate module 1-2, density 1.2-1.3 g / cm) and swept vermiculite or perlite fractions of 0.6-5 mm.

The chemical composition of the components listed in the table. one.

Samples are prepared as follows. The mixture of dried slags is ground to a specific surface Sua 3000-3200. The grinding product is mixed with expanded sand for 2-3 minutes, the resulting homogeneous mixture is shuttered with liquid glass and formed by vibrating the samples, which are held at 20-25 ° C for 12 hours. Then the samples are subjected to heat and moisture treatment according to mode 3 + 6 + 3 at 90 ± 5 ° С or drying at 60–80 ° С for 2–3 h.

In the process of hardening of perlitobetons, a bond is synthesized, the composition of hydration products of which is represented by low-basic calcium hydrosilicates, hydrogranates of a plasma-like crystalline phase of the composition ZSaO - (, Cr, 05, Pe, Oz) 2810, 4H20, and also alkali-alkaline ground-earth hydroalumosilicates p yes gmelenit-analcim. The composition of the curing products of the vermiculite concrete mixture is given below. compounds, and additionally includes magnesium hydrosilicates and hydropyumosilicates of variable composition.

The prevalence in the composition of the LUNG concretes of epitaxially growing cubic syngonic compounds contributes to the formation of a relatively stable structure of artificial stone, the strength of which after heat and moisture treatment reaches 8-10 Sh and stabilizes during prolonged storage.

In the process of roasting at 300–1000 ° C, the hydrate nano-formations characterized are capable of topotactic recrystallization into anhydrous crystal chemical-like compounds: NaCrSi Og (cosmochlor), - NaFeSi jO (aegirine), NaAlSi Oe, (greedy), B-C, 5, 2MgO-Cr., 03,

p -cs

Stable modification of larnite prevails in the composition of the products of burning, in the lattice of which, with the formation of a solid solution of introduction, is introduced into the composition of medium-carbon ferrochrome.

The predominant formation of chromo-alumina-ferritic alkaline silicates, which epitaxially grow together, is stabilized and contributes to obtaining artificial stone.

with a service temperature of up to 1000 ° C. The features of the dehydration products of pre ™ also determine the high temperature resistance of lightweight concrete and the increased residual strength of the samples after

roasting.

The smooth process of recrystallization of the hydrate phases in the anhydrous; as well as the crystal chemical similarity of the products of hydration and dehydration contributes to the treatment of stones, the amount of shrinkage of which does not exceed 0.2%.

The compositions of the mixtures and the properties of the samples from them are given in Table 2. The thermal stability is determined on cubes of 7–7 × 7 cm in size with a change in temperature of 800–50 ° C (cooling in a stream of air).

Claims (1)

Invention Formula Concrete mixture, including finely dispersed slag, low-modulus liquid glass and expanded perlite or vermiculite sand, is characterized in that, in order to reduce shrinkage and increase thermal stability and strength at 300-1000 ° C, it contains as a slag a mixture of highly basic converter and СеР- non-carbon ferrochrome slag in the ratio (3,, 67): 1 with the following ratio of components, wt.%: Fine mixture highly basic converter and medium carbon ferrochrome donkeys in the ratio (3.29- 15.67): 1 Low-modulus liquid glass (in terms of on ) Expanded perlite or vermiculite sand Tabl ferrochrome medium in relation to 3.29: 1, -30 Sodium soluble glass with MC - 1 (in terms of A mixture of converter shpak and slag of medium-carbon ferrochrome in the ratio of 15.67: 1 30 Sodium soluble glass with Mj 2 (in terms of) 15 Pearlite Sand 35 1008,1100 3008,3102.5 7,85008,9109.8 99 O. P6607.0 7009.3114,8 1000 t1.4140,74 table 2 8.8 f17.3 90 0.12 650 6,6 1100-1150 0.14 655 6.8 7009.3114,8 1000 t1.4140,74 ten slag n slag ferrochrome Continued table. 2 Prodolzhe e tavl. 2