JP2684691B2 - Composite concrete material - Google Patents

Description

TECHNICAL FIELD The present invention relates to a composite concrete material having excellent heat insulating properties and sound absorbing properties, which is useful as a building material such as outer wall panels and floor materials.

[Conventional technology]

Conventionally, foamed resin boards such as expanded polystyrene have
It is widely used in various building materials because of its excellent sound absorbing properties, and a composite concrete material in which a foamed resin plate is combined with a concrete plate is also known.

[Problems to be Solved by the Invention] However, there is a problem that the foamed resin plate is inferior in heat resistance and fire resistance. Therefore, it has been proposed to mix a flame retardant into the foamed resin, but the heat resistance and fire resistance are The sex is not enough.

In addition, since the foamed resin plate does not have heat resistance in this way, when concrete is compounded, it is not possible to cure the concrete with steam.

The present invention has been made to solve these problems, and an object of the present invention is to provide a composite concrete material which is excellent in heat resistance and sound absorption and has significantly improved heat resistance and fire resistance.

[Means for solving the problem]

In order to achieve the above object, the present invention has a concrete layer formed on at least one surface of a foamed inorganic layer in which foamed resin beads are dispersed in an inorganic silicate foamed polymer mainly composed of an inorganic silicate.

In this case, for example, expanded polystyrene beads are used as the expanded resin beads.

(Operation)

As described above, the composite concrete material of the present invention has a concrete layer formed on one side or both sides of a foamed inorganic layer in which foamed resin beads are dispersed in an inorganic silicate foamed polymer mainly composed of an inorganic silicate. Since this foamed inorganic layer has a density of 0.2 to 0.9 g / cm ³ and is lightweight, there is no inconvenience that the weight of the whole concrete composite material is significantly increased by this foamed inorganic layer, and excellent thermal insulation properties are obtained. It is also excellent in preventing dew condensation, and also has a very good sound absorbing effect.

Moreover, the heat resistant temperature of the foamed inorganic layer is usually 50.
Despite having foamed resin beads dispersed at 0 to 1000 ° C, it has excellent heat resistance and fire resistance, is advantageous in disaster prevention, and is strong against mechanical stress such as tension, compression, and bending.
It exhibits excellent mechanical properties.

Therefore, in the foamed inorganic layer, the characteristics of the foamed resin beads are effectively exhibited in combination with the characteristics of the inorganic silicate foamed polymer, and the composite concrete material in which the foamed inorganic layer and the concrete layer are combined has, for example, two to three floors. It has excellent performance as various concrete building materials such as outer wall panels and floors of concrete buildings.

Moreover, since the foamed inorganic layer has very high heat resistance, it can be cured by concrete with steam.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

〔Example〕

FIG. 1 shows an embodiment of the present invention. In this composite concrete material 1, a concrete layer 3 is laminated and integrated on one side of a foamed inorganic layer 2, and FIG. 2 is another embodiment of the present invention. In the composite concrete material 1 of this embodiment, concrete layers 3 and 3 are laminated and integrated on both sides of the foamed inorganic layer 2. The thickness of each of the layers 2 and 3 is appropriately selected according to its application and the like.

In this case, the foamed inorganic layer 2 has a structure in which foamed resin beads 5 are dispersed in a matrix 4 composed of an inorganic silicate polymer mainly composed of an inorganic silicate.

Here, the foamed inorganic silicate polymer forming the matrix 4 is formed from an inorganic self-hardening composition containing silicate and metasilicate as a main component and a surfactant. The foamed inorganic layer 2 is obtained by foaming and hardening a composition in which the foamed resin beads 5 are dispersed and mixed.

The inorganic self-hardening composition will be described in more detail below. The composition is as follows (% indicates weight%).

Silicate 15-66%, more preferably 30-60% Kaolin 0-28%, more preferably 5-20% Water-soluble magnesium salt 0-1%, more preferably 0.2
.About.0.8% silicofluoride salt 2 to 20%, more preferably 5 to 15% metasilicate 3 to 58%, more preferably 3 to 30% surfactant 0.1 to 2%, more preferably 0.1 to 1% water 0 to 15%, more preferably 5 to 13% In this case, sodium silicate is used as the silicate, magnesium chloride is used as the water-soluble magnesium salt, sodium silicofluoride is used as the silicofluoride salt, and sodium metasilicate is used as the metasilicate. As the surfactant, an anionic surfactant such as sodium lauryl sulfate is preferably used.

Examples of the foamed resin beads to be dispersed and mixed in the composition include expanded polystyrene beads, expanded polypropylene beads, expanded polyethylene beads and the like.
The size is appropriately selected, and as the foamed resin beads, beads that are 10 to 50 times expanded are preferably used.

The mixing ratio of the foamed resin beads to the inorganic self-hardening composition can be variously selected, but from the viewpoint of adhesiveness with the foamed resin beads, the former: the latter = 99: 1 to 85:15 (weight ratio).
Is preferred.

In the above composition, if necessary, inorganic or organic fillers such as inorganic fibers such as rock wool and glass wool, organic short fibers such as polyester, polyamide, polypropylene and vinylon, vermiculite, shirasu balloon, glass balloon and pearlite. , Suitable materials such as lightweight foam aggregate such as foam glass scrap, mica powder, sand, rocks and glass flakes can be mixed. In this case, the mixing ratio of these mixtures is not particularly limited, but 50 parts or less, particularly 30 parts or less relative to 100 parts of the total amount of the composition and foamed resin beads.
It can be equal to or less than a part.

The foamed inorganic layer may be prepared by injecting a mixture in which foamed resin beads are dispersed and mixed into the composition described above into a mold, or by spraying directly onto the concrete layer, or by arranging two concrete layers at predetermined intervals. It is manufactured by, for example, separating and facing each other, and injecting the compound into the gap. In this case, the compound is sufficiently stirred and air is entrained in the compound to be injected or sprayed in a foamed state. It is a thing. The stirring time and stirring speed differ depending on the amount of air entrained in the composition, but stirring at 50 to 1000 rpm for about 5 to 30 minutes is usually employed. Here, the air entrainment amount is preferably selected so that the density of the final cured product is 0.2 to 0.9 g / cm ^{3 (} note that the density when cured without entraining air in such a manner as described above). Is usually 0.
6 to 1.1 g / cm ³ ). When the formulation entrained with air is allowed to stand, this formulation (the above composition) is self-hardening and cures in a foamed state with air voids formed by the entrained air.

In addition, when the mixture in which the air is entrained in the concrete layer is blow-molded and cured, the cured product has a self-adhesive force and has a high adhesive force to concrete or the like, so that the adhesive is not used. It can be adhesively integrated.

〔The invention's effect〕

The composite concrete material of the present invention has a density of the foamed inorganic layer of usually 0.2 to 0.9 g / cm ³ and is lightweight, and its heat resistant temperature is usually 500 to 1000 ° C., which is excellent in heat resistance and fire resistance, It has high dynamic strength, is hard to expand, contract, and deform due to heat, and has excellent heat insulating and sound absorbing effects. Further, the composite concrete material of the present invention can be cured with steam.

Therefore, the composite concrete material of the present invention can be effectively used as various building materials such as flooring materials, heat-resistant boards for houses, interior / exterior boards, partition boards and curtain walls.

[Brief description of the drawings]

1 and 2 are cross-sectional views showing one embodiment of the present invention. 1 ... Composite concrete material, 2 ... Foaming inorganic layer, 3 ... Concrete layer, 4 ... Matrix, 5 ... Foaming resin beads.

Claims (1)

(57) [Claims] 1. A composite concrete material characterized in that a concrete layer is formed on at least one surface of a foamed inorganic layer in which foamed resin beads are dispersed in an inorganic silicate foamed polymer mainly composed of an inorganic silicate.