SU1477712A1 - Initial composition for making lightweigh concrete - Google Patents

Abstract

The invention relates to the manufacture of building materials, namely the manufacture of wood concrete based on gypsum in adhesives. In order to increase the strength of arbolite, the raw mix for the manufacture of arbolite contains, wt%: gypsum 42-46, woodfill 25-27, crushed in the acidic environment of flax fire 4-8, the rest is water. Arbolit has the following physical and mechanical properties: average density 710-750 kg / m ³ , thermal conductivity coefficient 0.14-0.15 W / mK, water absorption 89-93%, compressive strength 8.7-10.2 MPa, flexural strength 4.8-5.3 MPa. 1 tab.

Description

one

The invention relates to the manufacture of building materials, namely the manufacture of wood concrete based on gypsum in adhesives.

The purpose of the invention is to increase the strength of arbolit.

The used flax fire is a waste of the primary processing of flax, is subjected to grinding in a shredder of a blistering effect, for example in ball mills, under exposure conditions, dilute solutions of strong mineral acids - hydrochloric, nitrogenous, etc. (water-solid ratio B / T 0.2 -0.3;) until a homogeneous fine dispersed friable mass is obtained (residue on sieve No. 014 not more than 3%). In the course of such a treatment of the fire, along with mechanical grinding, it undergoes chemical destruction, which is expressed in partial

dissolving, as well as reducing the degree of polymerization of certain amounts of cellulose and other high-molecular substances of fires. The products of chemical degradation of flax fires, being in their structure and chemical composition by substances that are substantially similar to the main structural components of the wood filler, are capable of actively interacting with its surface under acidic conditions with the formation of chemical bonds. At the same time, the adhesion of the stone to the aggregate to the aggregate increases significantly, which, along with the reinforcing effect of finely divided fibers, contributes to a significant increase in the strength of arbolite products during bending and compression.

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Example. Raw materials: semi-aquatic gypsum, wood filler - coniferous wood shredded, flax fire - waste of primary processing of flax, crushed in a ball mill in an acidic environment - in a 0.1-normal solution of nitric acid at B / T 0.2 to the specific surface area characterized by residue on sieve no. 014 is 2.8%, water.

The withdrawn amounts of gypsum, wood filler, crushed flax and water fires in an acidic medium are introduced into a forced-action mixer and mixed for 3 minutes. From the mixture obtained by the plastic molding method, prism samples with a size of 100–100–400 mm are made, which after 1–1.5 h are disbanded and dried. After drying the material for 1 day. residual hygroscopic moisture is 4-5%. Samples are then tested according to standard procedures.

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The compositions shown in the table, in which the properties of the heat insulating material are also presented, are made in a similar way.

Claims (1)

Invention Formula Raw material for the manufacture of arbolita, including gypsum, wood filler, dispersed aggregate and water, so that, in order to increase the strength of arbolit, it contains as a disperse aggregate flax ground in an acidic medium in the following ratio, wt.% : at 42-46 25-27 4-8 Else 42 44 26 27 0.14 0.15 50 50 46 25 0.15 0.16 50 25