SU637400A1 - Raw mixture for making arboreous concrete - Google Patents

Description

The invention relates to the field of building materials, based on wood and mineral in the living (wood concrete, fibrolite, wood concrete, sawdust, etc.). The mixture can be used in the building industry for the production of building products. The known mixture for the manufacture of arbolite, in which, together with the mixing water, additives of inorganic salts-accelerators of hardening and organic substances, for example calcium chloride and diethanol, are introduced, is 0.2-0.6%. 1. A mixture is known that includes, by weight .: Portland cement 1.3-1.6; crushed wood 1; 50% aqueous solution of .patex 0.02-0.04; anhydrous calcium chloride O, 02-0 ,. Supplements of x.porous calcium with dietholamine or latex do not allow the manufacture of benign wood concrete from larch wood containing 10–15 times more water-soluble extractive substances than pine or spruce wood. The latter of these mixtures is closest to the invention in its technical essence and the effect achieved. The aim of the invention is to increase the adhesion strength of the merchant, to accelerate the hardening and to increase the strength of the finished arbolite. This is achieved by the fact that the raw mix for the manufacture of wood concrete, including Portland cement, wood filler, calcium chloride, water and an organic additive, contains glycerin as an organic additive in the following ratio of components, weight 4 .: Portland cement 1 Wood filler 0.7-0 , 9 Calcium chloride, 06–0.08 Water, 0.06–0.7 Glycerol, 0.015–0.04 The presence of glycerol interferes with the rapid setting of hydrated calcium in the mass when it is added to the mass. At the same time, glycerol contributes to a more complete dissolution of the initial grains of cement, preventing the formation of crusts from calcium hydrochloroaluminates around alumina tate components, VTO leads to an increase in the monotropity of the stone and improve its adhesion properties.

In tab. 1 shows the compositions 1 ,. 2 and 3 of the proposed raw mix.

Table 1

not enough water is added to the desired moistening of the mass, and then the mixture is pressed into the molds with fixed lids. The mixture (arbolit) is kept in the forms for a day, the forms are decoupled and before the test period the mixture matures in dry and dry conditions. Next, test the strength of the finished arbolite. Three samples are prepared for intermediate tests — a cube measuring 10x10x10 cm, for a day 28 days — six samples. Compression tests are carried out using the GSM-50 press.

Average indices of cubic strength of arbolite at the age of 28 days are given in table. 2

table 2

These mixtures are prepared as follows.

An air-dry crushed grain, for example, larch, whose grain size distribution is a fraction of 20 -10 mm20%, a fraction of 10-5 mm 70%, a fraction of 5 mm 10%, is loaded into a mixer, then a solution of QaC € g with glycerin is fed to it . The density of the solution is 1.13 - 1.14 g / cm. The mass is stirred for 1 minute, portland cement is fed, mixing is continued for another 1-1.5 minutes.

1 0.02

Thus, the addition of glycerol to the mass with a simultaneous increase in the consumption of calcium chloride (up to 0.060, 08 parts by weight) leads to an increase in the amount of adhesion of the cement paste to wood, which makes it possible to obtain good-quality arbolite from. crushing larch.

In tab. 3 shows the indicators of adhesion of cement paste to larch wood plates. The plates are detached at the WPM rupture point.

Table 3

When analogy with the existing technology of manufacturing arbolita

Claims (2)

Invention Formula Raw mix for the manufacture of arbolita, including Portland cement, wood filler, calcium chloride, - water and an organic additive, similar to the fact that increasing the adhesion strength of wood with wood filler; accelerating hardening and increasing the strength of arbolit; it contains glycerin as an organic additive at the following ratios of components, parts by weight: Portland cement 1 Wood filler 0, 7-0.9 06 Calcium chloride 0, 06-0.08 Water 0.06-0, .07 Glycerin 0.015-0.04. Sources of information taken into account in the examination: 1, USSR Copyright Certificate 258904, cl. From 04/31/34, 1968. 2. USSR author's certificate 346295, cl. From 04 To 43/00, 1970.