JPH0149675B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for producing lightweight mortar mixed with rice husk.

(Prior art) By mixing rice husk into mortar materials such as cement and sand, it is possible to produce lightweight mortar that is lightweight, highly elastic, and has excellent sound insulation, waterproofness, heat insulation, and impact resistance. is publicly known (for example, see Japanese Patent No. 107944 and Japanese Utility Model Publication No. 10-11184).

(Problem to be Solved by the Invention) However, rice husk has countless fine hairs on its surface, which function to prevent it from bonding with water-containing cement, etc. Even if it is mixed into mortar and kneaded, it has poor affinity with cement, etc., and if a large amount of rice husks is mixed into mortar, the rice husks will float to the surface and reduce the hardening strength of the mortar. After the mortar hardens, the rice husks may peel off or cracks may occur. Furthermore, when applying mortar to a wall surface using a trowel or the like, there is a drawback that it squeaks and is very difficult to apply due to the fine hairs and protrusions on the surface of the rice husks and the large number of folds on the surface of the rice husks.

In order to remove these defects of rice husks, it is known to treat rice husks with linseed oil in advance, mix it with magnesia cement, and knead it by adding water (as disclosed in the above-mentioned patent). 107944).

However, even with this method, there is still a problem that sufficient bonding strength between rice husk and cement cannot be obtained.

An object of the present invention is to provide a method for manufacturing lightweight mortar that solves these problems.

(Means for Solving the Problems) In the present invention, after adhering an adhesive to the surface of rice husk, powder or short fibers having a strong affinity with cement are further adhered to the surface, By curing the adhesive, a granular aggregate having rice husk as a core and a large number of protrusions on the surface is formed, and the aggregate is mixed into a mortar material containing at least cement and water. , is characterized by kneading.

(Function) In the present invention, before mixing rice husk into cement, etc., granules or short fibers having a strong affinity with cement are fixed to the surface of the rice husk using an adhesive. , after ensuring their connection,
Since they are mixed into cement, etc. as aggregates and kneaded, the bonding force between rice husks and granules or fibers, as well as the bonding force between those aggregates and cement, becomes extremely large, increasing compressive strength and tensile strength. It has the advantage of improving strength and preventing peeling of rice husks.

(Example) Next, examples of the present invention will be described.

1st Example A low-viscosity spray epoxy resin adhesive (for example, Semedai Co., Ltd. product number No.
1510, etc.), stir the rice husks well, and stop spraying the adhesive until the adhesive does not accumulate at the bottom of the container.

Thereafter, the rice husks are further stirred well so that the adhesive adheres uniformly to the surface of the rice husks.

Next, the rice husks with the above-mentioned adhesive attached to the surface are transferred onto a mixture of sand and calcium carbonate powder in a volume ratio of about 1:1 and stirred well, and the surface of each rice husk is Stir well so that the sand and calcium carbonate are evenly coated.

It is advisable to prepare a large amount of the mixture of sand and calcium carbonate so that even if the mixture adheres to the surface of the rice husks, there will still be a surplus.

Also, stir well while crushing the rice husks to prevent them from sticking together and forming lumps.

Next, after waiting for the adhesive to harden, the above mixture is sieved to remove excess sand and calcium carbonate, and a large number of microscopic particles consisting of rice husk as the core and sand and calcium carbonate powder are formed on the surface. A granular material having protrusions is formed.

This granular material is mixed as part of the aggregate in a volume ratio of 2 to 3 parts of the granular material, 1 to 2 parts of cement, and 1 to 2 parts of sand or calcium carbonate powder, and an appropriate amount of water is added to this. Knead. Furthermore, such an allocation is
Depending on the use of the mortar, for example, whether it is for floors, vertical walls, or board forming, etc.
Change and implement as appropriate.

When this kneaded material is applied to a vertical surface as a wall material, or formed into a board shape and cured, it becomes lightweight, highly elastic, and has excellent sound insulation, waterproofness, heat insulation, and impact resistance. Moreover, there is no fear of peeling off of rice husks or generation of cracks, and a lightweight mortar with high compressive strength and high tensile strength can be formed.

Second Example In this second example, in the same way as in the first example, rice husks with adhesive attached to the surface were dropped into glass fibers cut into lengths of about 1 to 4 mm. After stirring thoroughly and adhering glass fibers to the surface of rice husks, the adhesive is cured to form granules having rice husks as cores and glass fiber whisker-like protrusions on the surface. is mixed as part of the aggregate into other mortar materials similar to those in the first embodiment, and water is added and kneaded.

In this way, by using short fibers as the material to be attached to the rice husk surface instead of the powder made of sand and calcium carbonate in the first embodiment, the same effect as in the first embodiment can be achieved. In addition to being able to produce substantially the same functions and effects as the case, there is an advantage in that the tensile strength can be particularly improved.

Third Example In this third example, rice husks are dipped in a low-viscosity adhesive, then pulled up, and then sand 1, calcium carbonate powder 1, and short glass fiber 1 are placed on top of the rice husks. After sprinkling the mixture in proportions and stirring well, the adhesive is cured to form granules with rice husks as the core and many microprojections made of sand, calcium carbonate, and glass fibers on the surface. The granules are mixed into other mortar materials as part of the aggregate and kneaded.

According to the method of the third embodiment, it is possible to provide a lightweight mortar that has both the effects of the first and second embodiments.

Other Examples The adhesive is not limited to the epoxy resin type mentioned above, but other synthetic adhesives may also be used. A method other than the above method may be used.

Alternatively, the adhesive may be mixed with powder or fibers in advance.

Furthermore, in addition to the above-mentioned sand, calcium carbonate, and glass fiber, calcium silicate, asbestos, nonwoven fabric, and the like may be appropriately selected and mixed as materials to be adhered to the surface of the rice husk.

It goes without saying that the distribution of rice husks and cement and other mortar materials may be changed as appropriate depending on the use of the mortar.

(Effects of the Invention) As is clear from the above, according to the present invention, the bonding strength between rice husk and cement can be improved, and the possibility of peeling off of the rice husk and the occurrence of cracks can be eliminated. It can be effective.

Claims (1)

[Claims] 1. After adhering an adhesive to the surface of rice husk, powder or short fibers having a strong affinity with cement are further adhered to the surface, and the adhesive is hardened. , is characterized by forming a granular aggregate with rice husk as a core and having a large number of protrusions on the surface, and mixing the aggregate into a mortar material containing at least cement and water and kneading it. Method of manufacturing lightweight mortar. 2. The method for producing a lightweight mortar according to claim 1, wherein the granular material contains sand. 3. The method for producing a lightweight mortar according to claim 1 or 2, wherein the granular material contains calcium carbonate powder. 4. The method for producing a lightweight mortar according to any one of claims 1 to 3, wherein the fibers are glass fibers. 5. The method for producing a lightweight mortar according to any one of claims 1 to 4, wherein the adhesive is an epoxy resin adhesive. 6. The lightweight mortar according to any one of claims 1 to 5, characterized in that the adhesive is attached to the surface of rice husk by spraying the adhesive toward the rice husk. Production method. 7. Production of lightweight mortar according to any one of claims 1 to 6, characterized in that the adhesive is attached to the surface of the rice husks by immersing the rice husks in the adhesive. Method.