JPH0840782A - Mortal material for floor base - Google Patents

Abstract

PURPOSE:To obtain a mortal material for floor base capable of riveting, being lightweight, also excellent in impulsive sound-absorbing effect and heat insulating property and capable of carrying out self-leveling. CONSTITUTION:This mortal material contains hydraulic cement and 2-70 pts.wt. of a powdery organic elastic material, 2-50 pts.wt. of an inorganic foaming granule and 0.5 to 10 pts.wt. of fluidizing agent based on 100 pts.wt. of the hydraulic cement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mortar material for a boundary floor which is wet-processed as a base for an interior floor material.

[0002]

2. Description of the Related Art Conventionally, as a wet-type floor material to be used as a base for an interior floor material for general houses, hydraulic cement and sand mortar containing river sand as a main component, and a fluidizing agent added to this sand mortar Thus, SL (self-leveling) material having improved fluidity, or lightweight floor material in which a lightweight aggregate such as pearlite is mixed with sand mortar is widely used. These wet floor materials are usually kneaded with water and poured onto a base plywood, or they are troweled to smooth the construction surface, and then cured and cured for several days before construction. Such a wet construction has an advantage that the boundary material is surely spread to the corners, so that the corners are well settled. Especially, the SL material has high fluidity, and the surface is smooth only by pouring. Since there is a self-leveling effect, there is an advantage that trowel coating can be omitted.

However, none of the above-mentioned conventional wet-use floor materials have a binding property for nails, and interior floor materials such as flooring materials cannot be fastened with nails.
There was a problem in that the workability of the interior flooring material was poor because it could not be constructed unless it was done by adhesion. Further, since cracks are likely to occur, finishing work is difficult, and there are various problems that the impact sound absorbing effect and the heat insulating property are low.

Therefore, the applicant of the present invention first mixed the hydraulic cement with an organic elastic powder and an inorganic expandable powder to improve the binding property to nails, and at the same time, to absorb the impact noise and to insulate the heat. We proposed a mortar material for the boundary floor with improved properties (Japanese Patent Application No. 5-221290).

[0005]

By the way, when a fluidizing agent is added to sand mortar, the fluidity is improved and the construction work can be simplified due to the self-leveling effect. However, the mortar material containing a lightweight aggregate having a small specific gravity is used. When the fluidizing agent is added, the lightweight aggregate is lifted and it becomes impossible to form a uniform boundary. Therefore, in the conventional mortar material for floors, the self-leveling and the weight reduction are contradictory, and a lightweight floor material that does not require trowel coating has not been realized. The aforementioned mortar material for floors by the applicant of the present application is no exception to this, and since it contains a lightweight material such as an organic elastic powder and an inorganic expandable powder, trowel coating at the time of construction is indispensable. , Further improvement was required in terms of construction workability. The present invention has been made in view of the above technical background, and in addition to having the advantages of the conventional wet flooring material, it can be nailed, is lightweight, and has an impact sound absorbing effect and heat insulating property. Another object of the present invention is to provide a mortar material for a floor which is excellent and capable of self-leveling.

[0006]

Means for Solving the Problems As a result of repeated research, the inventor has found that even if the mortar material for the floor is a mixture of an organic elastic powdery material having a small specific gravity and an inorganic expandable powdery material,
It was found that the self-leveling effect can be exhibited while suppressing the lifting of the lightweight material by setting the addition amount of the fluidizing agent within a specific range, and the present invention has been completed. That is, the barrier mortar material of the present invention is a hydraulic cement, and 2 to 70 parts by weight of organic elastic powdery particles and 2 to 5 parts of inorganic expandable powdery particles with respect to 100 parts by weight of the hydraulic cement.
It is characterized by containing 0 parts by weight and 0.5 to 10 parts by weight of a fluidizing agent.

The hydraulic cement is mixed for the purpose of exerting strength in the mortar material for the floor after the construction. The type of hydraulic cement is not particularly limited, and it can be used as conventional mortar materials such as alumina cement, silica cement, blast furnace cement, fly ash cement, and sulfate resistant cement in addition to the most commonly used Portland cement. Anything is fine.

The organic elastic powdery particles are blended for the purpose of imparting elasticity to the mortar material for floors of the present invention and improving the nail holding power. The type of organic elastic body that can be used is not particularly limited, but its elastic force is important for expressing the nail holding force, and if it is too hard or too soft, the nail holding force will rather decrease. Therefore, the elastic force of the organic elastic body used in the present invention preferably has a Shore hardness of about 2 to 80. Specific examples that satisfy this condition include so-called EVA powder, which is a mixed foam of ethylene-vinyl acetate copolymer (EVA) and calcium carbonate, and synthetic rubber powder such as tire chips. The particle size of the organic elastic powder is not particularly limited, but is preferably about 1 to 3 mm in order to achieve uniform mixing with other components.

If the blending ratio of such an organic elastic powdery granule is less than 2 parts by weight with respect to 100 parts by weight of hydraulic cement, the nail holding power is poor, while if it exceeds 70 parts by weight, the hydraulic cement is relatively hard. The compounding amount of is reduced and the strength is reduced. Therefore, it is necessary to mix 2 to 70 parts by weight of the organic elastic powdery particles with 100 parts by weight of hydraulic cement. The preferred lower limit value of the organic elastic powdery particles is 5 parts by weight, and the preferred upper limit value is 50 parts by weight. In addition, at the construction site, it is common to mix the organic elastic powdery granules with hydraulic cement in a volume ratio, but the volume is large depending on the type, foaming degree, particle size, etc. of the organic elastic powdery granules used. Since they are different, it is difficult to uniformly specify the volume. Therefore, although the mixing ratio is specified by weight here, it may be mixed at the construction site in terms of volume. For example, when EVA powder having a bulk specific gravity of 0.2 kg / l is mixed in a volume, the mixing ratio is 100 kg of hydraulic cement.
It becomes 10 to 350 l, preferably 25 to 250 l for (about 100 l).

The above-mentioned inorganic expandable powdery particles are mixed for the purpose of reducing the weight of the mortar material for the floor and improving various functions such as fire resistance and sound absorption due to a decrease in thermal conductivity. Specifically, obsidian perlite, pearlite perlite, calcined vermiculite, shirasu balloon and the like can be used.

If the blending ratio of such inorganic expandable powdery particles is less than 2 parts by weight with respect to 100 parts by weight of hydraulic cement, there is almost no effect of weight reduction and improvement of functions such as fire resistance, while 50 parts by weight is used. If it exceeds, the strength of the boundary floor material decreases. Therefore, the blending ratio of the inorganic expandable powdery particles needs to be in the range of 2 to 50 parts by weight with respect to 100 parts by weight of hydraulic cement. The preferred lower limit value of the inorganic expandable powdery particles is 10 parts by weight, and the preferred upper limit value is 30 parts by weight. As with the organic elastic powdery granules, the inorganic foamable powdery granules have a large volume depending on the type and the degree of foaming of the inorganic foamable powdery granules, and it is difficult to define the volume by the volume. It is specified here by weight. Therefore, it may be added after being converted into a volume if necessary. For example, when pearlite having a bulk specific gravity of 0.2 kg / l is mixed by volume, the mixing ratio is 10 to 250 l, preferably 25 to 150 l with respect to 100 kg (about 100 l) of hydraulic cement.

The above-mentioned fluidizing agent enhances the fluidity of the mortar material for the floor, and by adding the fluidizing agent,
Simply pouring the mortar material makes the construction surface smooth and the coating can be omitted. The type of the above-mentioned fluidizing agent is not particularly limited, and any one can be used as long as it is used for a conventional SL material.
Examples thereof include carboxylic acids and sulfonic acids.

When the blending ratio of such a fluidizing agent is less than 0.5 parts by weight with respect to 100 parts by weight of the hydraulic cement, no improvement in fluidity is observed, while on the other hand, a large amount is blended in excess of 10 parts by weight. Then, the inorganic expandable powdery particles and the organic elastic powdery particles are lifted up, and a uniform flooring material cannot be obtained. Therefore, the mixing ratio of the fluidizing agent needs to be in the range of 0.5 to 10 parts by weight with respect to 100 parts by weight of the hydraulic cement. The preferable lower limit value of the fluidizing agent is 2 parts by weight, and the preferable upper limit value is 8 parts by weight.

In addition to these materials, various materials for improving the function of the flooring material may be blended within a range that does not impair the hardening power of cement. For example, fibers such as alkali glass fibers and ceramic fibers are used to prevent cracks in the floor material, lightweight aggregates such as styrene powder are used to promote weight reduction, and water retention agents are used to improve workability. To
A filler such as silica sand or calcium carbonate may be blended for cost reduction, or two or more of these may be used in combination.

[0015]

EFFECTS OF THE INVENTION The mortar material for floors of the present invention has not only basic functions as a flooring material such as strength, but also 100 weight parts of hydraulic cement and organic elastic powder particles 2 By mixing up to 70 parts by weight, the frictional resistance against the nail driven into the flooring material becomes large, so that the constraint force to the nail becomes large and the excellent nail holding force is exhibited. With such a nail holding force, it becomes possible to fasten the interior flooring material to the boundary flooring material with a nail, which simplifies the construction of the interior flooring material and shortens the construction time. In addition, the heat insulating property and the impact sound absorbing effect are improved as compared with the conventional boundary floor material, cracks are less likely to occur, and the elasticity of the boundary floor material itself is increased, so that the feel of the interior floor material after installation is also improved. Further, by mixing 2 to 50 parts by weight of the inorganic expandable powdery particles with 100 parts by weight of hydraulic cement, the weight of the floor material can be reduced. Furthermore, by adding 0.5 to 10 parts by weight of a fluidizing agent to 100 parts by weight of hydraulic cement,
While improving the fluidity of the mortar material, the lightweight organic elastic powdery particles and inorganic expandable powdery particles are not raised. Therefore, this mortar material for floors exerts a self-leveling effect, does not require trowel coating at the time of construction, and can form a uniform floor. In addition, since the amount of water during kneading may be smaller than in the conventional case, the curing period can be shortened, and the trowel coating is not required, so that the construction work can be simplified and the construction period can be shortened.

Further, since the mortar material for the boundary floor is applied by a wet method, the boundary floor material spreads all the way to the corners of the base, and the corners are well set. Even if the corners warp up because they are light after curing and curing, the warped up parts can be pressed by nailing, and the inconvenience caused by the weight reduction of the wet floor material can be eliminated by itself.

[0017]

EXAMPLES Next, specific examples of the mortar material for a floor of the present invention will be described.

When compounding the mortar material for the floor,
Portland cement as hydraulic cement, EVA hardness 50 as organic elastic powder, 0.2 mm / l bulk specific gravity and average hardness 2 mm, and Shore hardness 7
0, tire chips having an average particle size of 2 mm and a bulk specific gravity of 0.2 kg / l, and inorganic foamable powder particles having an average particle size of 2 mm and a bulk specific gravity of 0.2 kg / l obsidian pearlite, an average particle size of 3 mm, and a bulk specific gravity of 0 .1 kg / l calcined vermiculite, average particle diameter 1 mm, bulk specific gravity of 0.05 kg / l Shirasu balloon, and naphthalene-based fluidizing agent [made by Hoechst Synthetic Co., Ltd. (Melment (trade name)]) as a fluidizing agent, and others Alkali glass fiber, styrene powder, synthetic resin powder, and silica sand were prepared as the compounding materials of.

The above-mentioned respective compounding materials were mixed in the proportions shown in the respective Examples and Comparative Examples in the following Table 1, and the mixture shown in Table 1 was added depending on the presence or absence and the addition amount of the superplasticizer. The indicated amount of water was added, and the mixture was kneaded and cast on a base plywood to a thickness of 40 mm. In addition, in Table 1, the amount of water is shown as a relative value when Comparative Example 1 is set to 100. The one with the fluidizing agent added did not require trowel coating because the surface became smooth just by pouring the mortar material, but the one without the fluidizing agent smoothed the surface by trowel coating. After that, each was cured and cured. Table 1 also shows the period required for curing.

Next, the above-mentioned floor material was tested for nail holding force, compressive strength, impact sound absorbing effect and heat insulating property by the following methods. (Nail holding force) A flooring nail having a diameter of 2.0 mm and a length of 38 mm was vertically driven up to the nail head, and the force required to pull it out vertically was defined as the nail holding force. (Compressive strength) The compressive strength was measured based on JIS R5201. (Impact sound absorption effect) A lightweight impact sound test was conducted by the Japan Building Research Institute to determine the L value. (Adiabatic property) It was performed based on JIS A1412. The results of these evaluations are also shown in Table 1.

[0021]

[Table 1]

As is clear from the results shown in Table 1, all of the mortar materials for boundary floors of Examples had excellent nail holding power and good strength. In addition, the addition of a fluidizing agent provided a self-leveling effect, which made the construction surface smooth without trowel coating. In addition, since the amount of water required for kneading was small, the period required for curing was short and the construction period from construction to completion of curing could be shortened.

On the other hand, it has been found that when the compounding amount of the organic elastic body deviates from the range of the present invention, sufficient nail holding force cannot be obtained, and when the compounding amount is excessive, the strength also decreases. It was also found that even if the amount of the organic elastic powdery granules is within the range of the present invention, the excessive addition of the inorganic expandable powdery granules rather reduces not only the strength but also the nail holding power. In Comparative Example 3, since the blending amount of the organic elastic granular material or the inorganic expandable granular material is large and brittle,
It was destroyed during the impact sound absorption effect test. In Comparative Example 4, the EVA powder and the obsidian pearlite were lifted up due to the large amount of the fluidizing agent, and therefore the performance as a floor material could not be tested. Comparative Examples 5 and 6
The compositions are the same as those of Examples 5 and 6 except that the fluidizing agent is added, and the performance as a floor material is the same, but it requires a trowel coating at the time of construction, the workability is poor, and the curing period is long. It was

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Claims (1)

[Claims] 1. A hydraulic cement and the hydraulic cement 1
2 to 70 parts by weight of organic elastic powdery particles, 2 to 50 parts by weight of inorganic expandable powdery particles, and 0.5 to 10 parts by weight of a fluidizing agent with respect to 00 parts by weight Mortar material for the floor.