Abstract

Provided is a coarse aggregate that can be produced inexpensively and vastly improves the tensile strength of concrete. This coarse aggregate 10A for concrete has a spiral portion 1 in which a wire is spirally wound a plurality of times at a pitch greater than the wire diameter. The coarse aggregate 10A has rigidity that does not allow deformation under the weight of the coarse aggregate 10A. The coarse aggregate 10A can have, as the spiral portion 1, a solenoid-type first spiral portion 1 and a second spiral portion 2 having the winding direction M1 of the first spiral portion 1 as the spiral axis direction thereof. Alternatively, coarse aggregates 10J, 10K may have a straight section 4 of wire along the spiral axis L1 of the spiral portion 1. The straight section 4 is formed using wire in which one or a plurality of wires are arranged side by side. In this case, the spiral diameter of the spiral portion 1 may be made smaller at both ends in the spiral-axis L1 direction and larger in the center to produce the coarse aggregate 10J. Alternatively, a three-dimensional shape may be formed using wire to produce a coarse aggregate 10N for concrete, the coarse aggregate 10N having loops 7 on the vertices or sides thereof.

IPC Classes  ?

• C04B 14/34 - Metals
• C04B 14/48 - Metal
• C04B 20/00 - Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups and characterised by shape or grain distributionTreatment of materials according to more than one of the groups specially adapted to enhance their filling properties in mortars, concrete or artificial stoneExpanding or defibrillating materials
• E04C 5/18 - Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups of metal or substantially of metal
• E04G 21/02 - Conveying or working-up concrete or similar masses able to be heaped or cast

Abstract

In the present invention, when pouring concrete into a mold, a coarse aggregate is evenly distributed in the mold by a simple method. The concrete is poured by filling a mold (test body creation container 20) in advance with a metal coarse aggregate 10A that is bulkier than gravel and has a rigidity with which the metal coarse aggregate does not deform under its own weight, and filling the mold with mortar 30 while applying a vibration thereto. It is preferable that vibrations are initially applied to the metal coarse aggregate that fills the mold, and then the mortar is filled into the mold while applying vibrations to the mortar.

IPC Classes  ?

• C04B 14/34 - Metals
• B28B 23/02 - Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material wherein the elements are reinforcing members
• C04B 14/48 - Metal
• C04B 20/00 - Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups and characterised by shape or grain distributionTreatment of materials according to more than one of the groups specially adapted to enhance their filling properties in mortars, concrete or artificial stoneExpanding or defibrillating materials
• E04C 5/18 - Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups of metal or substantially of metal
• E04G 21/02 - Conveying or working-up concrete or similar masses able to be heaped or cast

Abstract

Provided is a coarse aggregate for concrete which can improve not only compressive strength but also tensile strength of concrete, can be produced efficiently, and can be obtained at low cost. The coarse aggregate is made of metal and is shaped such that both ends of a cylindrical body of a predetermined length are crushed and the thickness increases from the both ends toward the center. For example, the coarse aggregate may be a coarse aggregate 10A which is substantially tetrahedron-shaped, a coarse aggregate 10D in which substantially tetrahedron shapes are coupled at respective sides 13, or a coarse aggregate 10E which has two or more recessed portions that are recessed toward the center from a contour line in plan view and protruding portions corresponding to the recessed portions, or two or more protruding portions 16 which protrude from the center portion 14 toward the contour line L1, wherein distal ends of the protruding portions 16 are in the same plane and the thickness of the center portion 14 is thicker than the thickness of end portions of the recessed portions 15 or end portions of the protruding portions 16.

IPC Classes  ?

• C04B 14/34 - Metals
• C04B 20/00 - Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups and characterised by shape or grain distributionTreatment of materials according to more than one of the groups specially adapted to enhance their filling properties in mortars, concrete or artificial stoneExpanding or defibrillating materials
• C04B 28/02 - Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates

Abstract

A coarse aggregate 10A for concrete is made of metal and has metal particles Q formed by melted metal droplets welded to a surface thereof. This coarse aggregate is preferably shaped such that both ends of a cylindrical body of a predetermined length are crushed and the thickness increases from the both ends toward the center. For example, the coarse aggregate may be a coarse aggregate 10A which is substantially tetrahedron-shaped, a coarse aggregate 10D in which substantially tetrahedron shapes are coupled at respective sides 13a, or a coarse aggregate 10E which has two or more recessed portions that are recessed toward the center from a contour line in plan view and protruding portions corresponding to the recessed portions, or two or more protruding portions 16 which protrude from the center portion 14 toward the contour line L1, wherein distal ends of the protruding portions 16 are in the same plane and the thickness of the center portion 14 is thicker than the thickness of end portions of the recessed portions 15 or end portions of the protruding portions 16. This coarse aggregate can improve not only compressive strength but also tensile strength of concrete, can be produced efficiently, and can be obtained at low cost.

IPC Classes  ?

• C04B 14/34 - Metals
• C04B 20/00 - Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups and characterised by shape or grain distributionTreatment of materials according to more than one of the groups specially adapted to enhance their filling properties in mortars, concrete or artificial stoneExpanding or defibrillating materials
• C04B 28/02 - Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates