SU1203058A1 - Mixture for producing roastless porous gravel - Google Patents

Description

t The invention relates to the building materials industry and can be used to make an unburned porous gravel based on the ash of power plants used as a placeholder for lightweight concrete.

The purpose of the invention is to reduce the bulk density, increase the strength and frost resistance of porous gr Avi.

In the raw mix, coal ash with a specific surface area of 4200 g / cm of the following composition is used for the production of unburned porous gravel, wt.%: SiOj 51.5; 17.8; . U, 5; CaO 3.12; MgO 1.28; Kg 2.21; SO 0.18; P.P.P. the rest, ground lime (kettle) with a specific surface area of 4200 g / cm and an activity of 80% semi-aquatic gypsum, foam glass of fraction O, 1–5 mm, obtained from sodium liquid glass with a silicate module 2, which is dehydrated at 450–550 ° C. 50-60 kg / m3.

The foam glass that is part of the proposed raw mix, due to their gradual dissolution, is the source of the formation of pores and cells of different sizes in the gravel. As the grains dissolve slowly and mainly after the lime and gypsum interact with the ash, the sodium silicate has a positive effect.

72 80 86

14

ten

eight

granule strength. The addition of calcium nitrate to the raw material mixture leads to its interaction with dissolving silicate.

sodium to form sodium nitrate and calcium hydrosilicate as a result of the exchange reaction.

Calcium hydrosilicate is a source of additional strength.

gravel, and sodium nitrate, an activating agent interacting with ash. All this makes it possible to obtain a high strength of the granules with a reduced bulk mass.

The combination of calcium-nitrate and calcium nitrate in a lime-ash raw mixture for calcium silicate and nitrate causes the formation of highly dispersed in the first stage of hydration

colloidal phase — that improves

pelletization of the mixture and increases the strength of raw granules before steaming.

Example. Blend components

mix thoroughly, granulate on a plate granulator, irrigating with water at a B / T ratio of 0.55-0.6. The resulting granules with a size of 5-40 mm are steamed at 100 ° C.

-about

105 ± 5 C and dissipate into fractions

mode 3 + 5 + 3 h, dried at 105 ± 5 C and dissipated by 5-10; 10-20 and 20-40 mm.

The specific composition of the raw mix and the physicomechanical indicators of porous gravel are indicated, respectively, in Table. 1 and 2.

Table 1

6 5 3

5 3 2

3

2 1

Compiled by M. Khitrova Editor N. Gunko Tehred T. Tulik Proofreader S.

Order 8382/29 Circulation 604 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Raushsk nab., d.

Branch PPP Patent, Uzhgorod, st. Prnext, 4

table 2

Physical and mechanical performance

Claims (1)

(5 7) RAW MIXTURE FOR CREATION OF CREAM-FREE POROUS GRAVEL, including dusty ash from power plants, lime, gypsum, a hardening activator and a steam generator, characterized in that, in order to reduce bulk density, increase strength and frost resistance, it contains solidification as an activity and a steam generator, dehydrated foam glass of a fraction of 0.1-5.0 mm and additionally calcium nitrate in the following ratio of components, wt.%: Dusty ash of electric stations Lime Gypsum Dehydrated foam glass of a fraction of 0.1-5.0 mm None calcium waste