SU1399288A1 - Concrete mix composition - Google Patents

Abstract

The invention relates to compositions of concrete mixtures and can be used in construction. The purpose of the invention is to increase the coefficient of structural quality and water resistance. Concrete mix contains, may. %: ash of brown coal 74-86; wood filler 1-5; an aqueous solution of podmylnogo lye density of 1.025 g / cm 13-21. The concrete design quality factor is 0.1-0.13, the water resistance coefficient is 1.11-1.32. 2 tab. with $

Description

The invention relates to compositions of concrete mixtures and can be used in construction.

The purpose of the invention is to increase the coefficient of structural quality and water resistance.

Example. Source components

The ash of brown coal of the following chemical composition, nas%: SiO ,, 29.2 AljO, 16.2 /, 13.03J CaO 37.9; MgO 2.85; SO, ppt 0.92.

Mineralogical composition of ash, May% from 5.2-9.4 gSa 6.4-15.4; C, F 18.0-20.0, MgO 3.2-5.9 CaSO 1 ,, glass phase 52-79,

Wood filler - sawdust coniferous species of fractional composition, wt.% G more than 5 mm 1.6; 5.0-2.5 mm, 57.7 j 2.5-1.25 mm 13.4- 1.25-0.63 mm 11.4; 0.63-0.315 mm 12.2; 0.315-0.14 mm; 3.6i less than 0.14 mm 0.8.

Underburden liquor - waste production of chemical composition, May,%: saturated fatty acids 0.3-2.0 sodium hydroxide 0.1-0.5; sodium carbonate 0.5-1.0J and sodium chloride 8.0-13, OJ water the rest.

Underground lye in the system; The wood aggregate, ash, and the undermolk, simultaneously performs the functions of mineralizer, hardening activator, and plasticizer. In this case, the adsorption of the submold liquor and the formation of a monolayer on wood and ash particles, consisting of fatty saponified acidic lots, caustic, carbonic acid and sodium chloride, occurs. The monolayer neutralizes and blocks water recovery substances of wood, and also regulates the processes of dissolution of ash minerals and, first of all, the glass phase that prevails in volume. The submerged lye does not directly affect the mineral part of the live, but through the product of its interaction with water-extracting wood substances . The above mechanism of dissolution, colloidation and crystallization of neoplasms determines the effect of using sooty liquor in the proposed forest mineral systems.

The density of 1.025 g / cm is the optimal value, which corresponds to the maximum performance of the material. When the density is less or more

of this value, the water resistance and strength of concrete is less. A loading of 1.025 g / cm determines the activity of the monolayer of submill liquor at the interfaces and creates conditions for the formation of the optimal structure of the material.

The mixture is prepared as follows.

Wood filler - sawdust is mixed with an aqueous solution of sublimate liquor in a mortar mixer for 1-2 minutes, then brown coal ash is added and stirred for another 1.5-2 minutes to obtain a homogeneous mixture. The mixture is placed in molds and compacted by vibration for 30-60 seconds. Hardens mixture in natural conditions.

Calcium hydroxide, containing in the ashes, interacts with the components of the base liquid to form sodium hydrosilicates, which provide a rapid increase in strength.

The coefficient of constructive quality () is determined by the formula:

kkk

RC

Th about

where RC is the ultimate compressive strength, kgf / cm;

Ij og- volume weight, kg / m. The coefficient of water resistance is determined by the formula

8 rc

Ca

0

five

0

five

where r

28

R

hedgehog

compressive strength at 28 days of age} compressive strength after soaking samples in water for 24 hours, followed by drying to constant weight.

The compositions of concrete mixtures and the results of testing the fabricated samples are given in Table. one,

The effect of the density of the liquor on the strength of the concrete mix is given in Table. 2 on the example of the optimal composition.

Thus, an increase in the coefficient of the constructive quality of the concrete made according to the invention is 60-70%, and the coefficient of water resistance is 28-50% as compared with the prototype.

The use of submill liquor in a concrete mix reduces its cost by 1 m by 7–9 rubles due to lowering the cost of the submilk liquor and reduces energy costs for producing 1 m of concrete products by 2 rubles due to the intensive self-heating of the mixture in the presence of a submill of structural quality and water resistance it contains, as a alkali-containing additive, an aqueous solution of undermud liquor with a density of 1.025 g / cm in the following ratio of components, May. %:

Ash brown

Wood filling - 3 Underburden 19

240 230 198

Claims (1)

Claim A concrete mixture comprising brown coal ash, wood aggregate and an alkali-containing additive, characterized in that, in order to increase the coefficient of structural quality and water resistance, it contains an alkaline soap liquor with a density of 1.025 g / cm as the alkali-containing additive, the following ratio may. %: Brown coal ash Wood aggregate An aqueous solution of soap liquor with a density of 1.025 g / cm with components,