RU2243188C2 - Framed sawdust concrete - Google Patents

Abstract

FIELD: building materials, in particular for decorative and insulating coats and building construction.

SUBSTANCE: framed sawdust concrete is obtained from mixture containing liquid glass and plant-origin filler. Frame with void index of approximately 92 % is obtained by forming and curing of mixture containing (kg/m³): liquid glass 40-60; buckwheat straw with particle size of 2-4 cm and oar shuck as a filler; and in addition fine grinded quartz sand 10; and water 30; followed by impregnation with aerated mortar mix of composition (kg/m³): alabaster 61; white cement 27.5; flask with reactivity to oxide 22; calcium at least 220 mg/g; foaming agent 0.3; water 112; and curing. Finished body has bulk mass of 280-315 kg/m³; compression strength of 4-5 kgf/m²; and heat conduction coefficient of 0.072 W/(m.K).

EFFECT: material with improved strength and reduced water absorption.

2 tbl

Description

The invention relates to building materials and can be used in the manufacture of decorative and heat-protective coatings and building structures.

A known composition for the manufacture of heat-insulating material / 1 /, including water glass, flax bonfire, knot pulp, GKZh 104-8 when the content of components, kg / m ³ :

Liquid glass 57.5

Bonfire of Flax 135

Knot pulp 77.5

GKZH 104-8 8

However, the indicated composition is characterized by a low strength value and increased water absorption.

The purpose of the invention is to increase strength and reduce water absorption of the material.

This goal is achieved in that the frame arbolite, including water glass, finely ground quartz sand, vegetable aggregate, contains buckwheat straw and oat husk as the last agricultural waste and, in addition, is impregnated with a porous solution of gypsum-cement-pozzolanic binder (ГЦПВ).

The following materials were used to prepare the frame arbolite: sodium liquid glass with a module of 2.71, a density of 1490 kg / m ³ , quartz sand with a specific surface of 4000 cm ² g, buckwheat straw and oat husk. The particle size of buckwheat straw is 2-4 cm.

Frame arbolite is prepared in two stages in the following sequence. At the first stage, liquid glass, water, silica sand and vegetable aggregates are mixed until the surface of the aggregates is completely wetted and placed in molds with dimensions of 25 × 25 × 4 cm. The samples are incubated for 2-3 days under natural hardening conditions until the frame is completely cured. The consumption of components of the arbolite framework is, kg / m ³ :

Liquid glass 40-60

Quartz sand 10

Buckwheat straw 70-90

Oat husk 10-15

Water 30

The use of a porous vegetable aggregate with a particle size of 2-4 cm, a specially selected amount of binder, water, fine sand and oat husk, necessary to obtain a strong skeleton, allows to obtain at this stage a material with a voidness of 92-95%.

After curing, the resulting frame is impregnated with a pre-porous mortar mixture, including, kg / m ³ :

Plaster of construction 61

Cement (White) 27.5

Flask with activity in relation

calcium oxide not less than 220 mg / g 22

Frother 0.3

Water 112

After manufacturing, the frame arbolite is stored under natural conditions for 2 days until the stripping strength is set.

The use of agricultural waste makes it possible to obtain a frame composite with a low bulk density, low thermal conductivity, and relatively high compressive and bending strength. The introduction into the framework of a porous solution based on GCPV provides, with a slight change in the bulk density of the material, an increase in its fire resistance, strength, improvement in decorative qualities, and a decrease in water absorption.

Tables 1 and 2 show examples of the known / 1 / and the proposed compositions, as well as their physico-mechanical properties.

Claims (1)

Frame arbolite obtained from a mixture comprising water glass and a filler of vegetable origin, characterized in that the frame, characterized by a voidness of 92-95%, obtained by molding and curing a mixture including buckwheat straw with a particle size of 2-4 as a filler of plant origin cm and oat husk, and optionally - finely quartz sand and water, with the following ratio of components, kg / m ³ : Liquid glass 40-60 Specified Quartz Sand 10 Buckwheat straw 70-90 Oat husk 10-15 Water 30, impregnated with a porous solution of the composition, kg / m ³ : Plaster of construction 61 Cement white 27.5 Flask with activity on in relation to oxide calcium not less than 220 mg / g 22 Frother 0.3 Water 112 and hardened.