RU2360891C1 - Raw mix for foamed concrete - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: raw mix for foamed concrete includes the following components, wt %: Portland cement 69.5600-69.8500, multilayer carbon nanotubes with size of 10^-9 - 5.0-10^-8 m 0.0017-0.0019, foaming agent 0.8133-0.8781, water 29.3350-29.5600.

EFFECT: creation of foamed concrete with improved sound - and heat-protective properties with high strength in compression and bending.

1 ex, 2 tbl

Description

The invention relates to the field of building materials and can be used for the manufacture of products used in industrial and civil engineering.

A known mixture for thermal insulation foam, containing, wt.%:

cement 43.0-46.2 metallurgical slag 12.0-14.4 sand 15.0-18.0 based foaming agent stearate sodium density 1.15-1.7 g / cm ³ 9.5-10.3 chemical additive "DAY" 0.4-0.5 aluminum powder 0.5-0.6 fiberglass 1.4-1.8 water 12.0-14.4

(RF patent No. 2145315, С04В 38/10, 02.10.2000).

The disadvantage of this technical solution is the increased value of the coefficient of thermal conductivity.

A known mixture for thermal insulation foam, containing, wt.%:

cement 44.0-47.0 montmorillonite clay, including not less than 60% of the mineral 11.0-13.8 Foaming additive NIKA 0.5-0.7 water 40.0-42.8

(RF patent No. 2145586, C 04 B 38/10, 02.20.2000).

The disadvantages of this technical solution include the reduced value of the sound absorption coefficient.

Closest to the technical nature of the claimed mixture is a composition for producing building materials, containing, wt.%:

mineral binder (Portland cement) 33.0-77.0 multilayer carbon nanotubes size 6.0 · 10 ^-8 -2.0 · 10 ^-7 m 0.0001-2.0 water rest,

as well as technological additives, including foaming additive

(RF patent No. 2233254, С04В 28/02 // С04В 111: 20, 07/27/2004).

The disadvantages of this technical solution are the increased value of the coefficient of thermal conductivity and the reduced value of the coefficient of sound permeability.

The problem to which the invention is directed, is the creation of heat-insulating foam concrete with improved sound and heat-shielding properties with high compressive and bending strength.

This object is achieved in that the raw material mixture for foam concrete, including Portland cement, multilayer carbon nanotubes, a foaming additive and water, contains multilayer carbon nanotubes measuring 10 ^-9 - 5.0 · 10 ^-8 m with the following ratio of components, wt.%:

Portland cement 69.5600-69.8500 multilayer carbon nanotubes size 10 ^-9 - 5.0 · 10 ^-8 m 0.0017-0.0019 foaming additive 0.8133-0.8781 water 29.3350-29.5600

New compared to the raw material composition selected for the prototype, is the introduction of multilayer nanotubes (MWCNTs) of size 10 ^-9 - 5.0 · 10 ^{-8 -8} m, which contribute to the dispersion of cement particles and, as a result, an increase in cement particles exposed hydration, the consequence of which is an increase in hydration products, presented mainly according to x-ray phase analysis of low-basic calcium hydrosilicates type CSH (I), characterized by a fibrous structure, contributing to the compaction of the cement matrix, which ensures Increases strength indicators. According to microscopic studies, a change in the pore structure of the material is observed with the formation of small elongated pores open on the one hand, resulting in an improvement in sound and heat-shielding properties.

At the time of application, according to the authors and the applicant, the inventive raw mix for foam concrete is unknown and has a world novelty.

The inventive combination of essential features exhibits a new property of the mixture in the presence of MWCNTs of size 10 ^-9 - 5.0 · 10 ^-8 m, which allows to obtain the following technical results: improved coefficients of heat and sound protection indicators compared to the prototype.

The claimed invention is industrially applicable and can be used for the manufacture of heat-insulating, structural and mixed (heat-insulating and structural) foam concrete having improved sound and heat-shielding properties without affecting the strength characteristics.

Execution example

1. Preparation of mortar for foam concrete

1.1. Dose:

- cement PTs 400;

- MWCNTs with a size of 10 ^-9 - 5.0 · 10 ^-8 m;

- water.

1.2. Dosage materials are transported to a concrete mixer, where the components are mixed until a homogeneous mortar is obtained.

2. Preparation of construction foam:

2.1. Dose:

- concentrated solution of foam concentrate "NIKA";

- water.

2.2. Dosage components are mixed in a polyethylene container until the solution is homogeneous.

2.3. Using a foam generator, building foam is obtained.

3. Preparation of the raw mix for foam concrete

3.1. Using the foam generator pump, the resulting construction foam is transported to a concrete mixer, where the prepared mortar and construction foam are mixed together until a homogeneous foam concrete is obtained.

3.2. The resulting foam concrete mass from the foam mixer using a gerotor pump is poured into the forms of the required products, the curing of which is carried out according to the technological regulations.

For the preparation of foam, you can also use concentrated solutions of foam concentrates "Quin" or "Addimen Sb-31".

Addimen Sb-31 is a chemical foaming agent obtained through the process of the special conversion of natural protein macromolecules by hydrolysis in an aqueous solution. Complies with ASTM-869-80. The composition is presented in table 1.

Table 1 Name of substance wt.%: alkanes C ₁₂ -C ₁₉ 64 isobutyl alcohol (isobutanol) 2 aliphatic amines C ₇ -C ₉ (calculation by monoethanolamine) 21 formaldehyde 13

Research conducted: sound permeability according to GOST 16297-80; strength according to GOST 25485-89; thermal conductivity according to GOST 7076-87.

The results are presented in table 2.

The analysis of experimental data shows that the claimed raw material mixture for foam concrete in comparison with the prototype provides foam concrete with improved technical characteristics, namely: increase in compressive strength by 4.3 times; bending strength increase - 4.4 times; improvement of soundproofing properties - by 13%; decrease in thermal conductivity by 25%.

* - use MWCNTs with a size of 6.0 · 10 ^-8 m

Claims (1)

The raw material mixture for foam concrete, including Portland cement, multilayer carbon nanotubes, a foaming additive and water, characterized in that it contains multilayer carbon nanotubes measuring 10 ^-9 - 5.0 · 10 ^-8 m, in the following ratio, wt.%:
Portland cement 69.5600-69.8500 Multilayer Carbon Nanotubes size 10 ^-9 - 5.0 · 10 ^-8 m 0.0017-0.0019 Blowing agent 0.8133-0.8781 Water 29.3350-29.5600