Composite heat insulation-ballast material based on wood wastes

FIELD: construction.

SUBSTANCE: composite material contains cement, filler, water and additionally a filler. At the same time the filler is barite ore with particle size from 0.01 to 160 mcm, filler - wood chips with particle size from 0.5 to 20 mm at the following ratio of components, wt %: cement - 17-25, barite ore - 35-56, wood chips - 6-12, water - 20-30.

EFFECT: increased strength, reduced coefficient of heat conductivity, density.

1 tbl

 

The invention relates to the field of construction, in particular to materials derived from wood waste, and can be used for thermal insulation and ballasting of underwater pipes. Underwater pipeline design must have negative buoyancy, strength and to have thermal insulation to reduce the loss of the transported thermal energy.

Known insulating material obtained by mixing the pre-treated solution woody aggregate, Portland cement, additives and water, followed by molding and hardening, in which the wood filler take wood chips, as the solution for aggregate use 30% solution of glass sodium in the amount of 10% by weight of wood filler, the binder take the cement on the basis of Portland cement clinker with a tensile strength of 40 MPa, pre-mixed with the additive, which take the calcium chloride in the powdered state with a mass fraction of calcium chloride is not less than 90% and at 2% by weight of Portland cement after mixing the components with water in the mixture impose additional technical foam from an aqueous solution of hydrolysate 1% concentration (Patent No. 2493136 of the Russian Federation, IPC C04B 40/00, C04B 18/26, C04B 20/00. The way the floor is the treatment of insulation material / Ziatdinov D. F., Timerbaev N. F., Safin P. P., R. Safin, etc. no 2012107547/03; Appl. 28.02.2012; Publ. 20.09.2013). thermal conductivity of the material from 0,142 to 0,153 W/(m2*°C), a density of from 305 to 326 kg/m3.

The disadvantages of this material are a large number of components and their high cost, and low density, resulting in its use in underwater pipeline complicates the design because it requires additional ballasting from surfacing.

The closest in technical essence is the ballast material, which contains cement, aggregate and water. At the same time as filler it contains barite ore following fractions: coarse fraction with a grain size of more than 5 mm to 25 mm, the fine fraction with a grain size of more than 0.16 mm to 5 mm, very fine fraction with a particle size of from 0.01 μm to 160 μm. Additionally, the inventive ballast material contains a plasticizer, namely polycarbonatediol (Patent No. 2399828 of the Russian Federation, IPC F16L 58/06, C04B 28/00, C04B 111/20. Ballast material / Svechkarev A. P., Shaporin I. I. No. 2008127272/03; Appl. 07.07.2008; Publ. 20.09.2010).

The disadvantage of this material is that it cannot use as a heat insulator. The claimed material has a density of more than 3060 kg/m3therefore included in the group of heavy concrete. The materials included in this group, the coefficient of thermal conductivity is not the shrinks of 1.35 W/(m 2*°C). According to this indicator, the use of such materials as insulating materials of heat pipes techno-economically not justified.

The aim of the invention is to provide a composite heat-insulating-ballast material using waste wood having low thermal conductivity, negative buoyancy, high strength, namely the following physical and mechanical properties: coefficient of thermal conductivity no higher than 0,17 W/(m2*°C), a density of at least 1000 kg/m3the compressive strength after 28 days of not less than 5 MPa.

This goal is achieved by the fact that the claimed material contains cement, aggregate, water, and optionally a filler. The filler used barite ore with a particle size of from 0.01 to 160 μm, the filler - wood chips with a particle size of from 0.5 to 20 mm in the following ratio, wt.%:

Cement - 17-25

Barite ore - 35-56

Wood chips - 6-12

Water - 20-30.

The proposed composite material based on wood waste can be used for underwater pipes as thermal insulation and ballast at the same time.

In the patent and scientific literature, the proposed composition of the material with specified properties and performance not found.

With C the pouring process of filling the annular space of the plasticity of the material is provided by the ratio of water to wood shavings in the range of 2.5-3.5 and a fraction size of barite ore 0.01 to 160 microns.

To ensure the solidity of the material particle size of the filler should be in the range of 0.5-20 mm

Examples of compositions of the material and its characteristics are presented in the table.

As the cement used is Portland cement M400.

Determination of the average density of the mixtures, thermal conductivity and strength are presented in table made in accordance with GOST 12730.1-78, GOST 25380-82 and GOST 10180-90.

Results of field experiments, are shown in the table, show the benefits of the properties of the material according to the invention.

Table
No.The composition of the composite g/wt.%Density, kg/m3Coefficient of thermal conductivity, W/(m2*°C)The limit of compressive strength, MPa
Components
Portland1201/25
1barite1881/391433,8520,248holds 18.52
wood chips384/8
water1400/28
Components
Portland1201/18
2barite3762/561718,5930,33025,51
wood chips384/6
1400/20
Components
Portland1201/23
3barite1881/351090,5930,178,3
wood chips640/12
water1600/30
Components
Portland1201/17
4barite3762/521412,1480,21br11.01
wood chips640/9
water1600/22
The placeholder
Portland12-17
polycarbamylof 0.2-0.33060-3400No data56-75
5tributylphosphate0,0015
water4-10
bariterest

Composite insulation-ballast material based on wood waste containing cement, aggregate and water, characterized in that it contains as filler barite ore with a particle size of from 0.01 to 160 μm, and optionally, a filler - wood chips with a particle size of from 0.5 to 20 mm in the following ratio, wt.%:

Cement17-25
Barite ore35-56
Wood chips6-12
Water20-30



 

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