Concrete forming additive device and concrete structure

Abstract

To provide an adding tool for forming concrete and a concrete structure capable of providing convenience to a user.SOLUTION: The adding tool 10 for concrete formation is an adding tool for concrete formation to be added to concrete before hardening, and expanded parts 12, 13 thicker than a rod-like part are formed at one end and the other end of the rod-like part 11 formed in a rod shape. The concrete forming additive 10 generates tensile strength by overlapping another concrete forming additive in a range where one concrete forming additive restrains the concrete. In the concrete structure 1, the additive 10 for concrete formation is added to concrete before hardening.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a concrete-forming additive tool used for concrete, and a concrete structure made of concrete. [Background technology]

[0002] Concrete is generally made by mixing cement, water, coarse aggregate (crushed stone or gravel), and fine aggregate (sand), which is then solidified through the hydration reaction between the water and cement, and is widely used as a building material.

[0003] Concrete has the drawback of having a very low tensile strength, approximately 1 / 10 to 1 / 13 of its compressive strength. To compensate for this drawback, it is common to arrange reinforcing bars in a matrix pattern lengthwise and crosswise within the concrete. However, a new coarse aggregate, a roughly tetrahedral metallic coarse aggregate, has been proposed that can improve not only compressive strength but also tensile strength (Patent Document 1). Because of its roughly tetrahedral outer shape, this coarse aggregate exerts an anchoring effect in mortar, making it possible to improve tensile strength and shear strength compared to conventional coarse aggregates.

[0004] Furthermore, in order to improve the adhesion between metallic coarse aggregate and mortar, a coarse aggregate has been proposed in which a fine wire of count 20 or more is passed through the metallic coarse aggregate body, so that the wire can easily be wound around the coarse aggregate body (Patent Document 2). With this coarse aggregate, the wire is wound around the coarse aggregate body while the fresh concrete is being stirred, and the mortar is captured by the wound wire, so that the coarse aggregate and mortar move together, which has the advantage of making the coarse aggregate less likely to settle in the fresh concrete and improving the dispersibility of the coarse aggregate.

[0005] However, in the case of metallic coarse aggregate as described in Patent Document 1, the tensile strength of the coarse aggregate itself is too strong compared to the strength of the mortar portion of the concrete, so the interface between the coarse aggregate and mortar peels off, causing the mortar portion to break, and the coarse aggregate may not be able to contribute to further improving the tensile strength of the concrete.

[0006] As described in Patent Document 2, wrapping a wire around the metal coarse aggregate body can improve the adhesion between the coarse aggregate and mortar, but since the way the wire wraps around the coarse aggregate body is not consistent, there is a risk of variation in tensile strength.

[0007] In response to this, a coarse aggregate made of metal mesh material shaped into hollow spheres has been proposed to further improve the adhesion between the mortar and coarse aggregate, prevent fracture of the mortar, and improve the tensile strength of the concrete (Patent Document 3). [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 6485932 [Patent Document 2] Patent No. 6532073 [Patent Document 3] Patent No. 6667886 Summary of the Invention [Problem to be solved by the invention]

[0009] However, the coarse aggregate described in Patent Document 3 is made by processing and shaping a metal mesh material, which results in high material costs. On the other hand, coarse aggregate is typically used in large quantities, occupying approximately 70% of the volume of concrete, so it is necessary to make it available at a lower cost.

[0010] SUMMARY OF THE INVENTION The present invention provides a concrete-forming additive tool and a concrete structure that can be convenient for users. [Means for solving the problem]

[0011] The concrete-forming additive of the present invention is an additive that is added to concrete before it hardens, and is characterized in that one additive overlaps another in the area where one additive restrains the concrete, thereby generating tensile strength.

[0012] In addition, the concrete forming additive tool of the present invention is an additive tool for concrete formation that is added to concrete before it hardens, and is characterized in that it has a rod-shaped portion formed into one end and the other end of which has an enlarged portion that is thicker than the rod-shaped portion.

[0013] Furthermore, the concrete forming additive tool of the present invention is an additive tool for concrete formation that is added to concrete before it hardens, and is characterized in that bulging portions that are thicker than the three rod-shaped portions are formed at one end and the other end of three rod-shaped portions, the three rod-shaped portions are arranged in different directions from each other, and the middle portions of the three rod-shaped portions are connected and fixed together.

[0014] The concrete structure of the present invention is characterized in that the concrete forming additive device according to claim 1 or 2 is added to pre-hardened concrete. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a concrete forming additive tool and a concrete structure that are convenient for users. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a cross-sectional view showing a concrete structure to which an adding tool for forming concrete according to a first embodiment of the present invention has been added. [Figure 2] FIG. 1 is a first explanatory diagram showing the effect of the concrete forming additive tool according to the first embodiment of the present invention. [Figure 3] FIG. 2 is a second explanatory diagram showing the effect of the concrete forming additive tool according to the first embodiment of the present invention. [Figure 4] FIG. 10 is a perspective view showing an adding tool for concrete formation according to a second embodiment of the present invention. [Figure 5] 1 is a perspective view showing an adding tool for forming concrete according to a first embodiment, a third embodiment, and a fifth embodiment of the present invention. FIG. [Figure 6] FIG. 1 is a perspective view showing an adding tool for forming concrete according to a second embodiment and sixth to eighth embodiments of the present invention. [Figure 7] FIG. 11 is a perspective view showing an adding tool for forming concrete according to ninth to eleventh embodiments of the present invention. [Figure 8] FIG. 12 is a perspective view showing an adding tool for concrete formation according to twelfth to fifteenth embodiments of the present invention. [Figure 9] FIG. 13 is a perspective view showing concrete forming adding tools according to sixteenth and seventeenth embodiments of the present invention. [Figure 10] FIG. 20 is a perspective view showing an adding tool for concrete formation according to eighteenth and nineteenth embodiments of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] <Embodiment> Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0018] FIG. 1 is a cross-sectional view showing a concrete structure to which an adding tool for forming concrete according to a first embodiment of the present invention has been added. FIG. 2 is a first explanatory diagram showing the effect of the concrete forming adding tool according to the first embodiment of the present invention. FIG. 3 is a second explanatory diagram showing the effect of the concrete forming adding tool according to the first embodiment of the present invention. FIG. 4 is a perspective view showing an adding tool for forming concrete according to a second embodiment of the present invention. FIG. 5 is a perspective view showing an adding tool for forming concrete according to the first, third and fifth embodiments of the present invention. FIG. 6 is a perspective view showing an adding tool for forming concrete according to the second embodiment and sixth to eighth embodiments of the present invention. FIG. 7 is a perspective view showing concrete forming adding tools according to ninth to eleventh embodiments of the present invention. FIG. 8 is a perspective view showing concrete forming adding tools according to twelfth to fifteenth embodiments of the present invention. FIG. 9 is a perspective view showing an adding tool for concrete formation according to sixteenth and seventeenth embodiments of the present invention. FIG. 10 is a perspective view showing an adding tool for concrete formation according to the eighteenth and nineteenth embodiments of the present invention.

[0019] <Configuration of the first embodiment of the present invention> As shown in FIG. 1, the concrete structure 1 according to the first embodiment of the present invention is made by adding aggregate (coarse aggregate, fine aggregate) 3 and a concrete-forming additive tool 10 to pre-hardened concrete (cement paste, made by mixing cement as a binder with water), and kneading the mixture. The concrete structure 1 is made up of cement paste 2, aggregate 3, and concrete-forming additive tool 10.

[0020] The concrete forming additive tool 10 has a rod-shaped portion 11 formed in a rod shape, and teardrop-shaped swelling portions 12, 13 that are thicker than the rod-shaped portion 11 formed at one end and the other end of the rod-shaped portion 11.

[0021] The concrete forming additive tool 10 can be made of metals such as steel, aluminum alloys, and stainless steel alloys, fiber reinforced plastics such as glass fiber and carbon fiber, and high strength plastics.

[0022] The concrete forming additive tool 10 can be manufactured by forging, casting, welding, punching, molding, or the like.

[0023] <When the material of the concrete forming additive tool 10 is metal> If the concrete forming additive tool 10 is made of metal, it can be subjected to blasting (surface roughening) to strengthen cement adhesion. If rust prevention is required, it can be plated.

[0024] In one example of a specific method for manufacturing the concrete forming additive 10 when metal is used as the material, the rod-shaped portion 11 and the teardrop-shaped enlarged portions 12, 13 are integrally formed.

[0025] Here, the concrete forming additive tool 10 of the first embodiment is used in place of crushed stone as aggregate, and has a total length of 40 mm, a rod-shaped portion 11 having a diameter of 2 mm, and bulging portions 12, 13 having a thickness of 4 mm. The thickness of the bulging portions 12, 13 is formed by press forging. When iron is used as the material, hot-dip galvanizing is performed as the overall surface treatment.

[0026] <If the material of the concrete forming additive 10 is plastic> When the material of the concrete forming additive tool 10 is a plastic such as fiber reinforced plastic or high strength plastic, it is subjected to a matte finish, blasting treatment, etc. to strengthen cement adhesion.

[0027] In one example of a specific manufacturing method for the concrete forming additive 10 when plastic is used as the material, a plastic plate is punched out into the shape shown in Figure 1. In another example of a specific manufacturing method, the additive is die-cast, poured into a mold, and then removed.

[0028] In the concrete structure 1 to which the concrete forming additive 10 shown in Figure 1 has been added, in addition to the bonding force between the cement paste 2 and the concrete forming additive 10, the enlarged portions 12 and 13 of the concrete forming additive 10 engage with the cement paste 2 and apply a compressive force in the opposite direction to the tensile force applied to the concrete structure 1, resulting in concrete that is strong against tensile forces.

[0029] In contrast, as shown in Figure 2, in a conventional concrete structure 5 that does not use a concrete forming additive tool 10, the tensile force is resisted only by the bonding strength between the cement paste 2 and the aggregate (coarse aggregate, fine aggregate) 3, and therefore sufficient strength against the tensile force cannot be obtained.

[0030] Furthermore, in a concrete structure 7 to which the concrete forming additive tools 10a and 10b shown in Figure 3 (which are the same as the concrete forming additive tool 10 shown in Figure 1) have been added, the area 14 in which the enlarged portion 12 of one concrete forming additive tool 10a restrains the cement paste 2 overlaps with the area 14 in which the enlarged portion 13 of the other concrete forming additive tool 10b restrains the cement paste 2, thereby generating a stronger tensile strength.

[0031] Therefore, the reference numeral 14 indicates the range in which the concrete resists tension force using its inherent compressive strength.

[0032] Therefore, range 14 is the range in which the cement paste 2 resists tensile force, and compressive force is generated in the cement paste 2 by the concrete forming additive tools 10a, 10b, which resists the tensile force via the concrete forming additive tools 10a, 10b.

[0033] Furthermore, the concrete forming additives 10, 10a, and 10b can be used as they are in the manufacturing process, including ready-mix concrete plants, transportation, pumping, and pouring (pouring into the desired location). The concrete forming additives 10, 10a, and 10b have increased strength due to the combined anchoring effect with other aggregates.

[0034] The size of the concrete-forming additive tool 10 is not limited to the above-mentioned size, and various sizes are applicable. For example, in mass concrete used in dams, etc., the larger the maximum diameter of the concrete-forming additive tool, the more advantageous it is. On the other hand, even if the size of the concrete-forming additive tool is microscopic, smaller than fine aggregate, by simultaneously mixing something that has the same mechanical function as in the first embodiment, the ranges of effect overlap synergistically, and higher strength concrete can be provided.

[0035] <Configuration and Operation of the First Embodiment of the Present Invention> The configuration and operation of the first embodiment of the present invention will be summarized below. Concrete-forming additives 10, 10a, and 10b are additives that are added to concrete before it hardens, and one additive restrains the concrete in an area where another additive overlaps, generating tensile strength.

[0036] Here, the size of the concrete forming additive tools 10, 10a, 10b that serve as aggregates does not have to be uniform, and a composite of coarse, fine and minute aggregates will synergistically increase strength.

[0037] In this case, the concrete forming additive tools 10, 10a, 10b, which are coarse, fine, and fine (macro to micro) aggregates, are mixed together and the overlapping areas synergistically create tensile strength.

[0038] Concrete forming additives 10, 10a, 10b are coarse, fine, and minute concrete forming additives that are added to concrete before it hardens, and one concrete forming additive overlaps another in the area where the concrete is constrained, generating tensile strength from both a macroscopic and microscopic perspective.

[0039] Concrete forming additives 10, 10a, 10b are concrete forming additives that are added to concrete before it hardens, and have enlarged portions 12, 13 at one end and the other end of a rod-shaped portion 11 that is formed in a rod shape and is thicker than the rod-shaped portion.

[0040] The concrete structure 1 has a large number of concrete-forming additives 10 (such as sand and gravel) added to the pre-hardened concrete.

[0041] The concrete structure 7 is made by adding concrete forming additives 10a and 10b to the pre-hardened concrete.

[0042] Note that Figure 1 shows one concrete formation additive 10 added to the concrete structure 1, and Figure 3 shows two concrete formation additives 10a and 10b added to the concrete structure 1, but a large number of concrete formation additives will be added to the concrete structures 1 and 7.

[0043] The concrete forming additives 10, 10a, 10b and concrete structures 1, 7 of the first embodiment allow for the inexpensive production of concrete that is strong against tensile forces, and also improves its compressive, shear, and bending strength (compressive strength, shear strength, and bending strength). As a result, national resilience and infrastructure lifespans are possible, and user convenience is enhanced. This changes the common knowledge that concrete around the world is weak against tension to concrete that is strong against tension. Performance superior to that of reinforced concrete is achieved by reducing or eliminating the materials and labor required for assembling rebar in reinforced concrete. Such performance contributes to national resilience and is compatible with sustainable development.

[0044] <Configuration of the second embodiment of the present invention> As shown in Figure 4, the concrete forming additive tool 20 according to the second embodiment of the present invention is an additive tool for concrete formation that is added to concrete before it hardens, and is made by combining three cotton-swab-shaped members 21, 22, and 23 and welding the center 30 of the rod-shaped portion 11.

[0045] The three cotton-swab-shaped members 21, 22, 23 are the same as those used in the metal concrete forming additive tool 10 shown in FIG. 1, and the rod-shaped portion 11 and the teardrop-shaped enlarged portions 12, 13 are integrally formed.

[0046] The three swab-shaped members 21, 22, and 23 are arranged in the x, y, and z directions that are orthogonal to each other, and in this state, the center 30 of the rod-shaped portion 11 is connected and fixed by welding.

[0047] The concrete forming additive tool 20 can be made of materials other than metal, and the method of connecting the center of the rod-shaped part 11 can be adhesive, welding, fusion, or the like.

[0048] The concrete forming adding tool 20 according to the second embodiment is a representative embodiment of the present invention, and is the best or nearly the best embodiment.

[0049] In the concrete forming additive tool 20, teardrop-shaped arms (rod-shaped portion 11 and teardrop-shaped enlarged portions 12, 13) extend in three dimensions.

[0050] The concrete cement paste 2 sandwiched inside the teardrop-shaped parts at the ends of the arms (teardrop-shaped swelling parts 12, 13) is constrained within the arms. This state exists overlapping front to back, left to right, and up and down.

[0051] The concrete structure produced using the concrete-forming additive tool 20 becomes concrete in which the binder (cement paste 2) and the entire interior are constrained. That is, concrete that is strong against tensile forces from all directions is obtained.

[0052] The concrete forming additives 20 are shaped so that they do not get tangled with each other.

[0053] In the second embodiment, the concrete forming additive tool 20 has a maximum diameter of 40 mm, an intermediate diameter of 20 mm, and a minimum diameter of 5 mm. The reason for this is that the maximum diameter of the existing aggregate (crushed stone) is 40 mm, and this has been thoroughly studied in materials science. In addition, in terms of the production process, it can be used as is in ready-mix concrete plants, transportation, pumping, and casting (pouring into the desired location). Such settings are familiar to concrete production and construction sites.

[0054] Furthermore, the concrete forming additive tool 20 has increased strength due to the combined anchoring effect with other aggregates.

[0055] The size of the concrete-forming additive tool 20 is not limited to the above-mentioned size, and various sizes are applicable. For example, in mass concrete used in dams, etc., the larger the maximum diameter of the concrete-forming additive tool, the more advantageous it is. On the other hand, even if the size of the concrete-forming additive tool is microscopic, smaller than fine aggregate, by simultaneously mixing something that has the same mechanical function as in the second embodiment, the ranges of effect overlap synergistically, and higher strength concrete can be provided.

[0056] <Configuration and Operation of the Second Embodiment of the Present Invention> The configuration and operation of the second embodiment of the present invention will be summarized below. Concrete forming additive tool 20 is a concrete forming additive tool that is added to concrete before it hardens, and one concrete forming additive tool overlaps another concrete forming additive tool in the area where the concrete is restrained, generating tensile strength.

[0057] Here, the size of the concrete forming additive tool 20 that serves as the aggregate does not have to be uniform, and a composite of coarse, fine and minute aggregates will synergistically increase the strength.

[0058] In this case, the concrete forming additive tools 20 that are used to form coarse, fine, and fine (macro to micro) aggregates are mixed together, and the overlapping areas synergistically create tensile strength.

[0059] The concrete forming additives 20 are coarse, fine and minute concrete forming additives that are added to concrete before it hardens, and one concrete forming additive overlaps another in the area where the concrete is constrained, generating tensile strength from both a macro and micro perspective.

[0060] The concrete forming additive tool 20 has three rod-shaped portions 11, 11, 11 formed at one end and the other end thereof with enlarged portions 12, 13 that are thicker than the three rod-shaped portions, the three rod-shaped portions being arranged in different directions from one another, and the middle portions of the three rod-shaped portions being connected and fixed together.

[0061] In the concrete structure of the second embodiment, a large number of concrete forming additives 20 (such as sand and gravel) are added to the concrete before it hardens.

[0062] The concrete forming additive tool 20 and concrete structure of the second embodiment allow for the inexpensive production of concrete that is strong against tensile forces, and as a result, the strength against compression, shear, and bending (compressive strength, shear strength, and bending strength) is also improved, resulting in stronger national land and longer infrastructure lifespans, and providing greater convenience to users. This changes the common belief that concrete around the world is weak against tension to strong tensile strength. It achieves performance superior to that of reinforced concrete by reducing or eliminating the materials and labor required for assembling rebar in reinforced concrete. Such performance contributes to the strengthening of national land and is consistent with sustainable development.

[0063] <Various embodiments of additives for concrete formation> Figure 5 shows a group of rod-shaped concrete forming additives, with Figure 5(a) showing the first embodiment of the concrete forming additive 10. Figure 5(b) shows the third embodiment of the hook-shaped concrete forming additive 51, which has hooks on both ends of the rod-shaped portion. Figure 5(c) shows the fourth embodiment of the centipede-shaped concrete forming additive 52. Figure 5(d) shows the fifth embodiment of the faceted concrete forming additive 53.

[0064] Figure 6 shows a group of three-dimensional concrete forming additives, with Figure 6(a) showing a second embodiment of the concrete forming additive 20. Figure 6(b) shows a sixth embodiment of the wire brush ball-type concrete forming additive 54. Figure 6(c) shows a seventh embodiment of the bottle brush-type concrete forming additive 55. Figure 6(d) shows an eighth embodiment of the drum-type concrete forming additive 56.

[0065] Figure 7 shows a group of spiral concrete forming additives, with Figure 7(a) showing a coil-type concrete forming additive 57 of the ninth embodiment, Figure 7(b) showing a concrete forming additive 58 made of shaving iron lathe marks of the tenth embodiment, and Figure 7(c) showing a concrete forming additive 59 made of thread cut marks of the eleventh embodiment.

[0066] Figure 8 shows a group of plate-shaped concrete forming additives, with Figure 8(a) showing a washer-type concrete forming additive 60 of the twelfth embodiment. Figure 8(b) showing a flat bar-type concrete forming additive 61 of the thirteenth embodiment. Figure 8(c) showing a spring washer-type concrete forming additive 62 of the fourteenth embodiment. Figure 8(d) showing a modified washer-type concrete forming additive 63 of the fifteenth embodiment.

[0067] Figure 9 shows a group of wire frame concrete forming additives, with Figure 9(a) showing a wire frame wire ball type concrete forming additive 64 of the 16th embodiment and Figure 9(b) showing a wire frame water wheel type concrete forming additive 65 of the 16th embodiment.

[0068] Figure 10 shows a group of curved concrete forming additives, with Figure 10(a) showing an S-shaped concrete forming additive 66 of the 18th embodiment, and Figure 10(b) showing a fiber-assembled concrete forming additive 67 of the 19th embodiment.

[0069] The concrete forming additives 51 to 67 of the third to nineteenth embodiments also produce concrete that is strong against tension, and as a result, the strength against compression, shear, and bending (compressive strength, shear strength, bending strength) is also improved, resulting in stronger national land and longer infrastructure lifespans, and providing convenience to users. This changes the common knowledge that concrete around the world is weak against tension to strong tensile strength. It reduces or eliminates the materials and labor required for assembling rebar in reinforced concrete, thereby achieving performance that exceeds that of reinforced concrete. Such performance contributes to strengthening national land and is also consistent with sustainable development.

[0070] Furthermore, the concrete forming adding tools 51 to 67 of the third to nineteenth embodiments can be used as they are in the manufacturing process, including ready-mix concrete plants, transportation, pumping, and pouring (pouring into the desired location). The concrete forming adding tools 51 to 67 of the third to nineteenth embodiments have increased strength due to the combined anchoring effect with other aggregates.

[0071] The sizes of the concrete-forming additives 51 to 67 shown in Figures 5 to 10 can be varied. For example, in the case of mass concrete used in dams, the larger the maximum diameter of the concrete-forming additives, the more advantageous it is. On the other hand, even if the size of the concrete-forming additives is microscopic, smaller than the size of fine aggregate, by mixing additives with similar mechanical properties at the same time, the ranges of their effects overlap synergistically, and higher-strength concrete can be provided.

[0072] The concrete forming additive tools 51 to 67 shown in Figs. 5 to 10 do not have to be a single component, but rather a composite of coarse, fine and fine particles, which synergistically increases strength.

[0073] In this case, the concrete forming additive tools 51 to 67 which are used as coarse, fine and fine (macro to micro) aggregates are mixed and overlapped to synergistically create tensile strength.

[0074] Concrete forming additives 51 to 67 are coarse, fine and minute concrete forming additives that are added to concrete before it hardens, and one concrete forming additive overlaps with another concrete forming additive in the area where the concrete is constrained, generating tensile strength from both a macro and micro perspective.

[0075] In the concrete forming additive tools 10, 20, 51 to 67 of the first to nineteenth embodiments, iron, aluminum, stainless steel, plastic, fiber reinforced plastic, etc. can be used as the material.

[0076] The definition of aggregate in the present invention includes the concrete forming adding tools 10, 20, 51 to 67 of the first to nineteenth embodiments, coarse aggregate, fine aggregate, and aggregate in general (including fine aggregate).

[0077] In the concrete structures of the first to nineteenth embodiments, both the concrete forming adding tool and conventional aggregate are used as aggregate, but it is also possible to use only the concrete forming adding tool as aggregate.

[0078] Surface treatments that can be used include serrated, knurled, chromed, and hot dip plating. Surface finishes such as sandpaper can also be used to increase friction and adhesion.

[0079] The probability of cracking can also be reduced by using materials such as aluminum that have a similar expansion coefficient to concrete.

[0080] A viscous adhesive may be mixed into the cement paste before it hardens (by mixing and kneading the adhesive).

[0081] It is also possible to place concrete-forming additives of different diameters inside capsules that dissolve in water and mix them with cement paste.

[0082] Furthermore, in the first to nineteenth embodiments of the present invention shown in FIGS. 1 to 10, the size and material of the concrete forming additive tool and the concrete structure can be changed in various ways.

[0083] In this way, the structure, connections between components, chemical substances, and the like of the present invention can be modified in various ways without departing from the spirit of the present invention.

[0084] Materials can also be freely selected from metal, plastic, FRP, wood, etc. For example, it is possible to combine two or more components into one, or conversely, it is possible to configure one component from two or more separate components and connect them together.

[0085] Furthermore, the first to nineteenth embodiments are merely examples of the best mode or a mode close to it at present. [Explanation of symbols]

[0086] 1, 5, 7 Concrete structures 2. Cement paste 3. Aggregate 6. Crushed Stone 10, 20, 51-67 Additives for concrete formation 10a, 10b Concrete forming additive equipment 11 Rod-shaped part 12, 13 Ampulla 14 The range in which concrete can resist tension using its inherent compressive strength 21, 22, 23 Swab-shaped members 30 Center

Claims

1. A concrete forming additive tool that is added to pre-hardened concrete, A concrete forming additive device characterized in that one concrete forming additive device overlaps with another concrete forming additive device in the area where the concrete is restrained, thereby generating tensile strength.

2. A concrete forming additive tool that is added to pre-hardened concrete, 1. A concrete forming additive device, characterized in that a rod-shaped portion is formed in a rod shape, and swollen portions that are thicker than the rod-shaped portion are formed at one end and the other end of the rod-shaped portion.

3. A concrete forming additive tool that is added to pre-hardened concrete, A concrete forming additive device characterized in that three rod-shaped portions are formed at one end and the other end of the three rod-shaped portions, each having a bulge portion that is thicker than the three rod-shaped portions, the three rod-shaped portions are arranged in different directions from each other, and the middle portions of the three rod-shaped portions are connected and fixed together.

4. A concrete structure, characterized in that the concrete forming additive according to any one of claims 1 to 3 is added to unhardened concrete.

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