Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2000-09-19
2001-09-25
Yoon, Tae H. (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C427S407300
Reexamination Certificate
active
06294605
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a slurry composition for a reinforcement purpose, which can be suitably used for producing a strengthened object and for strengthening and/or repairing a concrete building.
2. Description of Related Art
A coating with paint on an outer surface of a concrete building is not only for obtaining an aesthetic appearance but also for preventing water from entering into the interior of the concrete structure. Namely, the concrete structure is, itself, not so sufficiently protected against the invasion by the water, which causes the concrete structure to be likely intruded by the water, thereby prematurely degrading the concrete structure. In a situation that any cracks existing on the surface of the concrete structure are located, an injection of a plastic material into the crack is done, which is followed by a coating of the concrete surface with a paint. As a result, any chance of an intrusion of the water into the concrete structure is as less as likely. However, it is actually inevitable that, in accordance with an elapse of time, a degradation of the surface of the concrete structure is proceeded, which causes the latter to be highly entered by rainwater. In this case, alkali components in the concrete structure are flown out, which makes, on one hand, the concrete structure to be fragile and, on the other hand, the inner reinforcing steel members to be corroded and to be swelled, thereby causing the concrete structure to be broken, resulting in a danger that parts of the concrete structure are separated and dropped.
In view of the above, a repairing work will be essential in a situation that a concrete structure becomes old so that it has portions which may easily be broken and separated. A mending of such a deteriorated concrete structure is, conventionally, executed such that the portions of the concrete structure where the separation is likely are subjected to a scraping, and a mending by using a mortal is done. As to defects of a large size in the concrete structure, anchor members are implanted to the concrete structure, with which reinforcing steel members are connected, on which assembly a mending by using a mortal is done.
The portions of the concrete structure, which are, even once, separated are neutralized due to the fact that the alkali components are flown out by rainwater, which causes the concrete structure to be less adhesive to the mortal. As a result, irrespective of the provision of the implanted anchor members, a further progress in the deterioration of the concrete structure is more likely.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a innovation for overcoming the above mentioned difficulties in the prior art.
Another object of the present invention is to provide a slurry composition capable of mending, in a idealized manner, a deteriorated concrete structure.
In order to attain the above mentioned objects, the present invention is based on the inventor's discovery that glass fibers have, under individually separated condition, an increased affinity with respect to various kinds of base materials, thereby attaining an increased reinforcing function under a solidified state. Namely, a reinforcing by glass fibers is per se conventional in a field such as a fiber reinforced plastic (FRP). Namely, in a conventional technique, a spinning of a bundle of glass fiber filaments (glass fiber strands) is done while applying thereto a chemical composition (size) containing a high polymer, oil and various emulsifier. During the spinning of the glass fiber filaments, the thickness of the single glass fiber filament is as fine as utmost about 9 &mgr;m. Thus, an individual winding of such a fine filament is impossible. At a result, the filaments of a number as large as several hundreds to several thousand are combined to a strand by applying a size to the filaments. The glass fiber strands are woven to a glass fiber fabric or are subjected to a cutting to obtain glass fiber chips. These glass fiber clothes or chips are used in the reinforced structure. For example, in case of a FRP ship, these grass fiber clothes are laminated on a mould. These laminated glass fiber clothes are bonded with each other by using an epoxy-based adhesive so that a shape of a ship is obtained.
In these conventional glass fiber reinforced structure, the bundled or bonded state of the multiplicity of glass fiber filaments by the size is unchanged. However, it is the inventor's discovery that the bonded state of the filaments can provide only a limited contact area between the glass fibers and the plastics, thereby reducing bonding force. In other words, a 100% use of the advantages of the fiber reinforced plastic is not attained. The present invention is based on this inventor's discovery. Namely, the present invention aims to obtain an idealized contact between the glass fibers and the plastics as the basic materials. In order to attain this object, a key idea of the present invention is in separating the glass fibers individually by removing the size and the individually separated glass fibers are mixed with a paint as the base plastic material. As a result, a highly increased contact area between the glass fibers and the plastic material is obtained, which results in an idealized reinforcing function by the glass fibers.
According to the first aspect of the present invention, a slurry composition is provided for reinforcing a concrete structure, said slurry composition including a paint and glass fibers suspended in the paint, said glass fibers being of a predetermined length that are cut from glass fiber filaments, said glass fibers to be suspended in the paint being under an individually separated condition without accompanying any residue of size on the surfaces of the glass fibers.
According to the second aspect of the present invention, slurry composition is provided for reinforcing a concrete structure, said slurry composition including a paint and glass fibers suspended in the paint, said glass fibers being of a predetermined length that are cut from glass fiber filaments, said cut glass fibers being the ones from which any residual size on their surfaces are removed by immersing the glass fibers to a solvent.
In the slurry composition, the glass fibers may preferably be the ones that are obtained by cutting the glass fiber strands as a bundle of glass fiber filaments to the predetermined length, while removing from the glass fiber strands a size which are attached to the filaments during execution of its spinning.
In the slurry composition, the cut length of the glass fibers may preferably in a range between 2 to 13 mm.
In the slurry composition, a weight percent of the glass fibers in the slurry may preferably be in a range between 5 to 15%.
In the slurry composition, the paint may preferably be an acrylic elastic paint.
According to the third aspect of the present invention, a method is provided for producing a slurry composition based on a paint for strengthening a concrete structure by applying the paint to a surface of the concrete structure, said method comprising the steps of:
providing chopped glass fiber strands as bundles of glass fiber filaments of a predetermined length;
removing from the cut length of the strands size applied to the strands during the execution of the spinning process in such a manner that glass fibers of the predetermined length which are separated individually from each other are obtained, and;
mixing the glass fibers with the paint for obtaining a slurry, wherein the individually separated glass fibers are suspended in the paint.
In the method, the cut length of the glass fibers may preferably be in a range between 2 to 13 mm.
In the method, a weight percent of the glass fibers in the slurry may preferably be in a range between 5 to 15%.
In the method, the paint may preferably be an acrylic elastic paint.
According to a fourth aspect of the present invention, a method is provided for reinforcing a concrete structure, by ap
Suzuki Masaomi
Suzuki Sotai
Kabushiki Gaisha Esugii
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Yoon Tae H.
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