Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1989-03-14
1991-02-26
Weston, Caleb
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156245, 156293, 264 69, 264 71, 264228, 264256, B29C 2912
Patent
active
049959328
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a novel paving block to be installed on the grounds such as streets and floors, and to a method for production of the paving blocks.
2. Background Art
The plane configurations of conventional paving blocks have a variety of shapes such as rectangles, squares, triangles, other polygons, circles, ovals, and other shapes. The peripheral side lines of the block can be straight, a curved line, a wave-like line or a combination thereof, as far as the blocks can be joined at an interval of a few millimeters when they are installed. The same plane configurations as those conventional blocks are employed in the present paving blocks.
A perspective view of a conventional paving block of rectangular parallelepiped is illustrated in FIG. 9, wherein a ceramic tile is bonded onto a cement concrete block having the same plane dimensions as the tile. Such conventional tile-bonded blocks have been produced by (1) placing a tile upside-down on the bottom of a casting mold and then casting concrete mortar thereon, or (2) casting concrete mortar into the mold and placing a tile thereon (e.g. Japanese Laid-open Pat. Application No. 61-142202). According to the above-mentioned method (1), some dissolved components of concrete mortar flow down and deposit on the tile surface to form efflorescence. According to the method (2), lots of voids remain or are formed at the interface between the tile and block, which largely deteriorate the bonding strength between them. Moreover, durability is also decreased because water such as rain often permeates into the bonded interface through the voids.
Incidentally, a tile-bonded panel is known for walls composed of a multiplicity of tiles bonded onto a substrate board. In such tile panels, large bonding strength of tile is not especially needed because a large external force is not pressed on such wall panels, and also permeation of water is prevented because joint intervals of the tiles on the substrate board are filled with jointing paste. Thus, such tile-bonded panels for walls should be clearly distinguished from tile-bonded paving blocks.
The paving blocks are installed on the grounds such as streets at an interval of about 2 to 5 mm. The joint intervals of blocks thus installed are filled with sand (not with jointing paste).
The paving blocks installed on the grounds such as streets receive a variety of heavy loads from cars or the like. As a result, the blocks move to each other by complicated forces applied thereto and are often inclined together, whereby the shoulder portions of adjacent blocks collide with each other and break off.
SUMMARY OF THE INVENTION
The main object of the present invention is to solve the above-mentioned breaking or fracture problems and to provide novel paving blocks wherein the fracture of the shoulder portions is substantially eliminated.
There is thus provided, according to the present invention, a paving block having a structure comprising a block substrate consisting essentially of inorganic hydraulic cement and aggregate, and a top solid layer bonded to the upper surface of the block substrate: characterized in that the top layer is selected from a cured cement mortar layer firmly bonded to the substrate by its self-adhesive property and a tile-like layer firmly bonded to the substrate with cured cement mortar; the top layer is bonded to the block substrate with lateral margins of the substrate around the top layer of about 1 to 8 mm wide in horizontal distance from the peripheral edges of the substrate; and the vertical distance from the surface of the top layer to the peripheral edge of the substrate is about 5 to 50 mm.
It is preferred that the top solid layer mentioned above be firmly bonded to the block substrate with squeeze-out deposits of cured cement mortar around the top layer, whereby the bonding layer of cement mortar is substantially free of voids to increase bonding strength and to prevent the bonded interface from permeation of water.
There is also provided, according to the p
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Fujii Morizumi
Kodama Osamu
Kuroe Kazuro
Munakata Hideyuki
Nishimura Michihiko
Chichibu Cement Co. Ltd.
ILB Co., Ltd.
Inax Corporation
Weston Caleb
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