JPH01185385A - Static expansive demolishing agent - Google Patents

Abstract

PURPOSE:To control the occurrence of bursting of a demolishing agent out of a hole for safety in demolishing operation, by incorporating at least a specified amount of a porous substance having pores of a specified diameter in at least a specified volume ratio into a static expansive demolishing agent composed mainly of CaO. CONSTITUTION:At least 5wt.% porous substance having at least 10vol.% pores of a diameter of 0.05-1mm is incorporated into a static expansive demolishing agent composed mainly of CaO and, if required, containing calcium borate, SiO2, etc. Examples of the porous substance include a glass filter, a porous brick, an aerated concrete, a plastic foam, zeolite, charcoal, and lava. When the demolishing agent thus obtained is introduced into a bored hole of, e.g., rock, CaO will react with water to expand in volume so that an expansion force will cause cracking. Although the internal pressure will rise then due to heat generation, the incorporation of a porous substance can prevent bursting of solid material, such as CaO, out of the hole.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for statically crushing brittle objects such as concrete and rocks.

<Prior Art> Conventionally, a static crushing agent containing CaO as a main component has been known as a substance for statically crushing concrete, rocks, etc.

<Problem to be solved by the invention> CaO reacts with water to cause volumetric expansion, and the expansion force causes cracks to form in the boreholes of concrete, rocks, etc., but when it reacts with water, it generates heat. As a result, the temperature inside the hole becomes 100°C or more, the internal pressure becomes high, and CaO and other solids may be ejected from the inside of the hole. Because this phenomenon is difficult to predict and erupts at high speed, workers may be injured by looking into the hole. Although various measures have been taken to prevent this eruption, There is nothing.

<Means for solving the problems> The present invention provides a static crushing agent containing CaO as a main component,
A static crushing agent comprising 5% by weight or more of a porous material having 10% by volume or more of pores of 0.05 to 1 size. CaO in the present invention reacts with water and exhibits an expansion action, and the shape thereof may be either a powder or a granule. Further, in order to adjust the reaction of CaO with water, various salts such as borates, clinker minerals such as 3CaO, 5iO7, etc. may be added. A porous material is an important component constituting the static crushing agent of the present invention.
The porous material may be made of various materials, either inorganic or organic, but the pore diameter is 0.05 to 1.5%, and the porous material contains 1% or more of pores, and further, The amount of porous material is 5% by weight or more in the static crushing agent component. Examples of such porous materials include glass filters, porous bricks, cellular concrete, plastic foams, as well as zeolites, charcoal, volcanic lava, and the like. The shape of such a porous material may be amorphous, but the size is preferably 1 to 1011.

<Effects of the Invention> The static crushing agent of the present invention can significantly suppress the occurrence of the agent spouting phenomenon from inside the hole, so that not only can crushing work be performed safely, but also the crushing agent cannot be crushed due to spouting. In addition, waste such as having to perform crushing work again can be eliminated.

<Example> This will be explained in more detail below with reference to Examples.

Example 1 85 parts by weight of Ca0, 15 parts by weight of alumina cement, 2.5 parts by weight of calcium borate, pores of 0.05-1 m
A fluid slurry was prepared by adding 40 parts by weight of water to a powder mixture consisting of 10 parts by weight of lightweight bricks (shape: amorphous, 3-particle size: 3-511, bulk specific gravity: 0.9) having 2 vol. The slurry was made into a mold with an inner diameter of 40 mm, a wall thickness of 4 mm, and a height of 30 mm (1 m).
The inner tube is a PVC cylinder with an inner diameter of 48tm and a wall thickness of 611m.
A steel pipe with a height of 300 mm and a PVC/steel double pipe as an outer pipe were filled up to the hole. Water vapor was generated after 3 minutes, but no jetting of the agent occurred. 10 similar tests
This was repeated several times, but no eruption occurred.

For comparison, when we repeated the same test 10 times using only the mixture excluding the lightweight bricks, we found that 6
A double eruption phenomenon occurred.

Patent applicant: Asahi Kasei Industries, Ltd.

Claims (1)

[Claims] In a static crushing agent whose main component is CaO, 0.05 to
A static crushing agent comprising 5% by weight or more of a porous material having 10% by volume or more of 1 mm pores.