JPS6287457A - Construction material based on volcanic ash - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to building materials, such as tiles and blocks, which are lightweight, robust, and have low water absorption and are made of volcanic ash as a main component.

Traditionally, this type of building material, such as tiles or tiles used for wall materials, flooring, etc., blocks used for fences, etc., uses clay as a raw material and is made by firing it, or is made from cement as the main component. However, all of these have drawbacks such as being heavy, having low strength, and having high water absorption.

An object of the present invention is to provide building materials such as tiles and blocks that are lightweight, robust, and have low water absorption, and whose main component is volcanic ash.

In order to achieve the above-mentioned object, according to the present invention, a mixture of volcanic ash and clay is molded into a desired shape, and then the molded product is made to absorb an aqueous solution of a media aid and then fired. The water cutting solution contains one or more selected from the group of fired glass powder, quartz powder, carbonated lime, and nitrate lime;
It is characterized by being an aqueous solution containing one or more selected from the group of lead oxide, borax, calcined borax, and industrial salts.

Hereinafter, the present invention will be explained in detail using the accompanying drawings. FIG. 1 is a schematic diagram showing the manufacturing process of a building material according to the present invention.

First, volcanic ash is sufficiently dried in a drying kiln 1 at a temperature of 400 to 600°C. The dried volcanic ash is then mixed with the clay in a stirrer 2. The mixing ratio of the volcanic ash and clay is preferably in the range of 75-80:20-25 by weight. Note that additives such as pigments may be added to the mixture as necessary.

Next, the mixture is molded into a desired shape, such as a block shape or a tile shape, using a molding machine 3, and then an aqueous solution of the auxiliary agent is sprinkled onto the molded product using a sprayer 4, and absorbed.

The aqueous medium solution is selected from the group consisting of one or more selected from the group of fired glass powder, quartz powder, carbonated lime, and nitric lime, and the group consisting of lead oxide, powder sand, powder sand, and industrial salt. For example, a combination of 30 parts by weight of fired glass powder, 30 parts by weight of lead oxide, and 20 parts by weight of fired borax, 30 parts by weight of quartz powder, 40 parts by weight of lead oxide, and a combination of 20 parts by weight of fired borax. A combination of 20 parts by weight of sand, a combination of 30 parts by weight of carbonate lime powder and 50 parts by weight of industrial salt, or a combination of 20 parts by weight of nitric lime and 10 parts by weight of borax, respectively.
It is an aqueous solution obtained by dissolving 60 times as much water.

The molded product having absorbed the aqueous medium and auxiliary solution is then transferred to a firing pot 5 and fired at a firing temperature of 1050 to 1250°C for about 1 hour to obtain a building material in a desired shape, such as a block 6 or tile 7. This building material was very lightweight compared to conventional ones.

The water absorption rate and compressive strength of the product (sample) thus obtained were measured. To determine the water absorption rate, first wash the sample thoroughly with water to remove dirt and other particles on the surface, dry it at 100-110℃ until it reaches a constant weight, then cool the sample to room temperature and soak it in still water at 15-25℃. After absorbing water for 24 hours or more, wipe off the visible water film on the surface using a highly absorbent cloth to make the surface dry and saturated, and use this weight as the weight of the dry and saturated surface with Ws. After drying this sample at 100 to 110°C until it has a constant weight, it is cooled to room temperature in a desiccator, and the weight of the sample at this time is expressed as the weight of the sample after drying as WD, and these Ws Using the following formula, water absorption Q
The test was conducted by determining the overlapping percentage (%).

Ws-W.

Q = ----X 100 D The above test was conducted twice, and the average value is shown below.

The compressive strength was determined by determining the compressive strength of the building material of the present invention after 28 days using the J r 55002 test method.

The results were as follows.

Water absorption: 0.9% or less Compressive strength: 450 kg/c or more The above results show the following.

The product according to the present invention has a very low absorption rate compared to those of the prior art, and therefore, even if the product is used in cold regions, it will not cause damage from freezing (cranking occurs in structures). (It never happens.) It also has high compressive strength and excellent robustness, making it possible to construct structures with high compressive strength.

As described above, the volume of the present invention is reduced by about 20% after firing, which improves the robustness and reduces water absorption at the same time.

The present invention is useful because volcanic ash, which is the main material, exists in large quantities everywhere in Japan, and combined with its relatively simple manufacturing method, it also has the secondary effects of being inexpensive and suitable for mass production. It is something that should be said.

[Brief explanation of drawings]

FIG. 1 is a manufacturing process diagram of the building material of the present invention. 1... Drying kiln, 2... Stirring machine, 3... Molding machine, 4... Spreading machine, 5... Baking pot, 6... Block, 7... Tile.

Claims (1)

[Claims] A mixture of volcanic ash and clay is molded into a desired shape, and then an aqueous medium adjuvant solution is absorbed into the molded product and then fired. Volcanic ash characterized by being an aqueous solution containing one or more selected from the group of nitric lime and one or more selected from the group of lead oxide, borax, calcined borax and industrial salt. Building materials such as tiles and blocks as main ingredients.