JPH10195844A - Revetment block using volcanic ejecta as main material and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To establish a manufacturing method in which a revetment block makes a river or the like suitable for living of fishes and microorganisms not to impair an ecological system, and, if volcanic ejecta is used as main material, a strong and stable product can be made without requiring a bonding agent. SOLUTION: A revetment block has many porous volcanic rocks or gravels buried in the surface side of concrete main body which uses volcanic ejecta as main aggregate and contains silica sand very small grains similar to this over the whole surface in such a manner that the surface is partially exposed. In manufacture, a superplasticizer mainly composed of alkyl aryl sulfonate high condensation product is jointly used and added to form the block according to a designated procedure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a revetment block (including a panel type) mainly made of volcanic eruption products such as volcanic ash and lapilli, or similar walls, dams, and the like. Used for construction materials such as quays.

[0002]

2. Description of the Related Art Concrete panels or blocks in which natural stones or the like are stuck or buried on the surface are currently widely used as seawalls for rivers and beaches. When manufacturing this, there is a method of burying stones etc. from the upper surface of concrete that has not solidified yet, but this method is easy to peel off and does not increase productivity, so at present the stone or sandy form is formed on the upper surface of the mold (face plate) After filling the concrete and filling the concrete from above, hardening and demolding, the remaining sandy filling material is stripped and removed, or stone or lava etc. is applied to the existing concrete panel. Is bonded with an epoxy adhesive.

[0003]

In such a conventional block or panel of a revetment or a wall (hereinafter collectively referred to as a revetment block), a slump for improving physical properties of a backing concrete in a manufacturing process thereof is used. If the stones are lowered into a stiffened state, the adhesion of the stones will worsen.Therefore, the stones must be stuck with an adhesive or the physical properties of the concrete body must be reduced, and stones must be placed on the bottom of the formwork first. After that, in the method of backing with concrete, it is extremely troublesome and difficult to remove the remaining filler material such as sand, which significantly impedes productivity, and furthermore, the components of alk that elutes from the concrete body There are problems such as being unfavorable for all living organisms such as microorganisms and fish, and insufficient durability against acidic water, seawater and the like. An object of the present invention is to solve such a problem and to provide a seawall block which is more durable and desirable for an ecosystem.

[0004]

According to the present invention, a revetment block is composed of a volcanic ash or a rubble and other volcanic eruptive material as a main aggregate, and is attached to the front side of a concrete body containing fine grit or similar siliceous fine particles. A large number of porous volcanic rocks (large ones) or gravel (small ones) are buried in such a way that their surfaces are partially exposed.

In the production, ready-mixed concrete containing a volcanic eruptive material as a main aggregate, and a superplasticizer containing fine gira or similar siliceous fine particles and a highly condensed alkylallyl sulfonate as main components is added. Is filled into a formwork and vibrated, and a large number of porous volcanic rocks or gravel are buried from the upper surface so that the upper part is partially exposed, hardened, hardened, and then released to form a seawall block.

[0006] Alternatively, a large number of porous volcanic rocks or gravel and granular foam are placed on the entire bottom surface of the formwork, and from above the volcanic eruptive material is used as the main aggregate, and fine gira or similar silica sand is used. After filling the fresh concrete to which a fluidizing agent mainly composed of fine particles and alkyl allyl sulfonate high-condensate has been added and applying vibration, after hardening and demolding, the granular foam remaining on the surface is removed. Revetment block.

[0007] The term "fine killer" used herein refers to a particularly fine siliceous fine grain "killer" which is also called "pilot" generated as a by-product in the process of refining raw materials such as ceramics and glass. Most of the ultra-small particles having a size of about 1 μm have a shape closer to a sphere than a needle-shaped material such as volcanic ash.

[0008] On the other hand, "a fluidizing agent mainly composed of a highly condensed alkyl allyl sulfonate" is an admixture for concrete mainly composed of petrochemical products and having excellent cement dispersibility. It does not contain harmful chlorides at all and can improve fluidity without adding water by adding and stirring immediately before casting into low slump base concrete with a small unit water volume kneaded in a normal ready-mixed concrete plant In addition, even if the AE agent or the AE water reducing agent is added later to the concrete, the effect of increasing the slump is exhibited.

[0009] Although volcanic rocks and gravel are generally porous, basalt lava gravel from the Izu Islands to the Mt. Fuji system has an extremely high strength, and is suitable for use in the present invention. However, the lava gravel that is common in Sakurajima, Tohoku and Hokkaido is poor in strength due to high foaming, so when using this, be careful not to break when stacking products.
It is necessary to arrange the high-strength lava gravel as described above at the same point and at the same height.

The "granular foam" to be placed together with the volcanic rock or gravel on the bottom of the form is preferably a relatively high foam such as pearlite or styrene foam, and has a particle size of about 1 to 2 mm. Small ones are desirable.

[0011] This granular foam is almost free-falling after concrete is cast and removed from the mold, and deviates.
Note that it is not necessary to carefully remove what remains on the surface. In particular, inorganic substances such as perlite can be exposed to a water flow such as a river as it is, and can be left to the course of nature. In the case of polystyrene foam, it can be easily treated with a burner, a solvent, or the like, if necessary.
The meaning of “removing the particulate foam remaining on the surface” in the present invention is intended for all such cases including natural fall.

[0012]

The revetment block according to the present invention uses almost all volcanic ejecta from the volcanic rocks or gravel placed on its front side to the concrete backing. When applied to rivers, etc., the porous lava gravel surface exposed to the water provides a habitat for a vast variety of microorganisms, and is also chemically stable, robust, Since no alkaline harmful substances such as harmful organisms are leached out, it is extremely suitable for maintaining the ecosystem of seawalls.

The manufacturing method of the present invention makes it possible for the first time to realize such a revetment block in a practical manner. That is, in the conventional method, since it is difficult to adhere concrete and porous volcanic rubble, etc., an adhesive such as an epoxy resin has to be used, or even if it is first placed on the bottom of the formwork, Although it was extremely difficult to achieve this except when using natural stone, in the present invention, a combination of aggregates such as volcanic ash and siliceous fine particles so small as to cause Brownian motion, and alkyl allyl sulfonate high condensate With the synergistic action of this, the siliceous fine particles actively moving between the acicular particles react with the free lime of the cement and rapidly become pozzolanic, so that the alkaline ac is eliminated.

At the same time, even in the case of volcanic ash ready-mixed concrete, which originally had a reduced water content and a low slump so as not to deteriorate the physical properties of the concrete, the fluidizing agent mainly containing alkyl allyl sulfonate high-condensate can be used. By applying vibration, it quickly liquefies, coupled with the bearing effect of micro-killers, and spreads well to every corner of the porous lava rubble, and has strong adhesion with the concrete itself, and the concrete itself is dense and stable alkali elution The revetment block with few is realized.

[0015]

Example 1 A similar type of conventional revetment block formwork was mixed with 1 W% of fine killer particles having a particle size of about 0.1 mm and small volcanic ash as coarse aggregate and sandy ash as fine aggregate. A fluidizing agent containing a high-condensation product of alkyl allyl sulfonate as a main component in ready-mixed concrete (trade name: Hyfluid; Takemoto Yushi K.K.
K) was added and kneaded with an omni mixer, and the mixture was filled and vibrated. A large number of porous basalt lava pebbles with a particle size of about 10 cm were buried from above, and buried so that the upper part protruded and exposed. , Press and smooth with a plate from above, and after curing, remove the mold. The obtained revetment block was attached to a huge ecosystem where fish and various creatures came, and was extremely durable and the lava rubble on the surface was hard to peel off.

[0016]

Example 2 The same lava gravel and particle size of 1 to
2mm perlite pearlite is spread over the entire surface, and then filled with fresh concrete similar to the above example and vibrated. After curing, the pearlite adhered to the surface is removed, and the surface is removed. I do. This is applied to the river as it is, and the perlite is left to natural treatment.

[0017]

As described above, according to the present invention, porous lava gravels, which have been extremely difficult to adhere firmly without using an adhesive, are also used as concrete materials mainly composed of volcanic products. The surface is extremely favorable for living organisms, and has the effect of enabling stable mass production of seawall blocks suitable for ecosystems.

Claims (3)

[Claims] 1. A volcanic rock or gravel having a porous shape is provided on the front side of a concrete body containing a volcanic eruptive material as a main aggregate and containing fine gira or similar siliceous fine particles,
A revetment block mainly composed of volcanic eruptions, characterized by being buried entirely so that its surface is partially exposed. 2. A ready-mixed concrete containing a volcanic eruptive material as a main aggregate and a superplasticizer containing a fine killer or a similar siliceous fine particle and a fluidizing agent mainly composed of a highly condensed alkyl allyl sulfonate. A method of manufacturing a seawall block mainly composed of volcanic ejecta, wherein a large number of porous volcanic rocks or gravel are buried from the upper surface so as to partially expose the upper part thereof. 3. A large number of porous volcanic rocks or gravels and granular foams are placed on the entire bottom surface of a formwork, and a volcanic eruptive material is used as a main aggregate from the upper side, and fine gira or similar silica sand is used. Filling the ready-mixed concrete with microparticles and fluidizing agent containing alkyl allyl sulfonate high-condensate as the main component, applying vibration, hardening and demolding, and removing the particulate foam remaining on the surface. A method of manufacturing a revetment block made mainly of volcanic ejecta.