A high-performance prefabricated UHPC hollow paint-free building block

Abstract

The present invention discloses a high-performance prefabricated UHPC hollow paint-free building block, which relates to the field of building materials, including an ultra-high performance concrete building block body, which is a hollow structure, a reinforced partition is provided in the hollow part, a trapezoidal full-length groove is provided in the middle of the left side wall of the building block body, a first convex structure is provided on the inner concave surface of the trapezoidal full-length groove, and a second convex structure corresponding to the first convex structure is provided in the middle of the right side wall, so that the outer walls of the connection between the left and right adjacent building block bodies are closely fitted after docking, and a horizontal joint is formed in the middle, and grooves are correspondingly provided on the upper and lower end surfaces of the building block body and the reinforced partition, so that the outer walls of the connection between the upper and lower adjacent building block bodies are closely fitted after docking, and upper and lower joints are formed at the corresponding grooves, and the horizontal joints and the upper and lower joints are filled with mortar for bonding, and the building block body makes steel fibers concentrated on the surface of the bonding layer through an external magnetic field. The present invention not only improves the bonding strength of the building block, but also has no visible seams in the overall appearance, eliminating the need for secondary painting.

Description

Technical Field

[0001] The invention relates to the field of building materials, in particular to a high-performance prefabricated UHPC hollow paint-free building block. Background Art

[0002] At present, ordinary concrete blocks are widely used in construction and engineering projects, but they also have the following shortcomings, including:

[0003] 1. The overall strength and durability of concrete masonry depends on the strength of the blocks themselves and the bonding strength between the blocks. At present, the strength of ordinary concrete blocks themselves and the bonding strength between the blocks are both low. In particular, the bonding layer between the blocks is the weak point of masonry cracking and damage, resulting in low overall strength and durability of the masonry. Therefore, it is not suitable for projects that require high strength and high durability;

[0004] 2. The hollow rate of ordinary concrete blocks is generally around 30%-50%, the overall mass is heavy, the masonry process consumes manpower, and the construction is inconvenient. After the masonry is completed, due to the uneven surface of ordinary concrete masonry, both sides need to be painted, which not only consumes a lot of materials, but also prolongs the construction period;

[0005] 3. Ordinary concrete masonry has low strength, durability and fireproof and thermal insulation properties. It is urgent to improve the strength of the blocks themselves and the bonding strength between blocks to meet the requirements of modern engineering structures for strength and durability, thereby increasing the engineering application scope of masonry. Summary of the invention

[0006] In view of the problems existing in the above-mentioned prior art, the present invention provides a high-performance prefabricated UHPC hollow paint-free building block with high hollow ratio, high strength, high durability, no mortar joints and better aesthetics.

[0007] The technical solution adopted by the present invention is as follows: a high-performance prefabricated UHPC hollow plaster-free building block, including a building block body prefabricated with ultra-high performance concrete, the building block body is a hollow structure that runs through from top to bottom, the hollow part is provided with a reinforcing partition connecting the front and rear side walls, a trapezoidal full-length groove is provided in the middle of the left side wall of the building block body, and a plurality of undulating first convex structures are provided on the inner concave surface of the trapezoidal full-length groove, a second convex structure corresponding to the first convex structure is provided in the middle of the right side wall of the building block body, so that the outer walls of the connection between the left and right adjacent building block bodies are tightly fitted after docking, and a horizontal seam with protrusions on both sides is formed in the middle, grooves are correspondingly provided on the upper and lower end surfaces of the building block body and the reinforcing partition, so that the outer walls of the connection between the upper and lower adjacent building block bodies are tightly fitted after docking, and upper and lower seams are formed at the corresponding grooves, the horizontal seam and the upper and lower seams are filled with mortar for bonding, and the building block body uses an external magnetic field to concentrate steel fibers on the surface of the bonding layer.

[0008] Furthermore, the coverage rate of the steel fibers on the surface of the bonding layer in the block body is more than 30%, and the exposure rate of the steel fibers is more than 20%.

[0009] Furthermore, the hollow ratio of the block body is 60%-70%.

[0010] Furthermore, the first protrusion structure and the second protrusion structure are both wave-shaped protrusion structures.

[0011] Furthermore, the horizontal joints and the upper and lower joints are filled with ultra-high performance mortar. The ultra-high performance mortar (UHPM) is used to bond the UHPC hollow blocks of the present invention, and the material strength grade is more matched, and its bonding performance can be maximized to ensure the overall bonding performance of the blocks.

[0012] Furthermore, the front and rear side wall surfaces of the block body are treated with plastering. By using plastering treatment during prefabrication of the UHPC block, the surface of the block is clean and smooth, and painting is unnecessary.

[0013] The beneficial effects of the present invention are:

[0014] (1) The blocks are made of UHPC material, which can be designed to reduce the block thickness to within 2 cm, and the block hollow rate can reach 60%-70%. While ensuring its high performance, it saves raw materials and reduces the overall material cost by more than 30%, making it more cost-effective. Compared with ordinary hollow concrete blocks of the same size, it can reduce the weight by more than 20% and has certain fireproof and heat-insulating functions. In particular, the strength grade can reach 3-5 times that of ordinary concrete blocks, and the overall durability is also far superior to ordinary concrete masonry structures;

[0015] (2) By applying an external magnetic field, the steel fibers in the UHPC material are concentrated on the surface of the block bonding layer. The block bonding with high-strength mortar can improve the block bonding strength, improve the overall strength and durability of the masonry, and reduce the amount of steel fiber material. The volume fraction of steel fiber can be reduced to 0.2%, reducing the cost.

[0016] (3) The wavy protrusions on both sides of the horizontal joints of the blocks are arranged in a staggered manner. A full-length groove structure is set between the upper and lower joints of the blocks and at the cross partitions. When bonding the blocks, high-strength mortar is applied into the grooves, and the mortar does not leak out. The overall appearance has no visible seams and is more beautiful. Combined with the compacting performance of UHPC, the surface is smooth and can be put into use directly, eliminating the need for secondary painting, saving materials and shortening the construction period.

[0017] The present invention can be used for the construction of engineering structures such as walls and columns that require high strength and high durability, and has good application prospects in the field of engineering construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for describing the embodiments:

[0019] Figure 1 It is a structural schematic diagram of the high-performance prefabricated UHPC hollow paint-free building block of the present invention.

[0020] Figure 2 The present invention Figure 1 Schematic cross-section of the block shown.

[0021] Figure 3 The present invention Figure 1 Schematic diagram of the planar steel fiber magnetic distribution of the block shown.

[0022] Figure 4 The present invention Figure 1 Schematic diagram of the magnetic distribution of the steel fibers on the facade of the block shown.

[0023] Figure 5 The present invention Figure 1 Schematic diagram of the horizontal joint structure of the block shown.

[0024] Figure 6 The present invention Figure 1 Schematic diagram of the upper and lower joint structure of the block shown.

[0025] Figure 7 The present invention Figure 1 Schematic diagram of the stacking of the blocks shown.

[0026] In the figure: a block body 1, a reinforcing partition 2, a trapezoidal full-length groove 3, a first protruding structure 4, a groove 5, a second protruding structure 6, and mortar 7. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0029] like Figure 1-Figure 4As shown, this embodiment provides a high-performance prefabricated UHPC hollow paint-free block, including a block body 1, which is a hollow structure that runs through from top to bottom, and the hollow ratio is designed to be 60%-70%. The hollow part is provided with a reinforcing partition 2 connecting the front and rear side walls. The block body 1 is prefabricated with ultra-high performance concrete (UHPC), and the UHPC fine aggregate part can be replaced by localized tailings sand, which further reduces the cost while ensuring the high performance of the block. The blocks can be prefabricated in batches in the factory and steam-cured. When the blocks are prefabricated in the factory, the steel fibers are concentrated on the surface of the block bonding layer through an external magnetic field, so that the coverage rate of the steel fibers on the bonding layer surface reaches more than 30%, and the steel fiber exposure rate reaches more than 20%, so as to enhance the bonding performance between the blocks and the ultra-high performance mortar (UHPM), and the bonding strength between the blocks can be increased by 20%-30%, and at the same time, the volume fraction of the steel fibers can be reduced to 0.2%.

[0030] A trapezoidal through-length groove 3 is provided in the middle of the left side wall of the block body 1, and a plurality of first convex structures 4 are provided on the inner concave surface of the trapezoidal through-length groove 3. A second convex structure 6 corresponding to the first convex structure 4 is provided in the middle of the right side wall of the block body 1, so that the outer walls of the connection between the left and right adjacent block bodies 1 are closely fitted after docking, and a horizontal joint with convexities on both sides is formed in the middle. The upper and lower end surfaces of the block body 1 and the reinforcing partition 2 are correspondingly provided with grooves 5, so that the outer walls of the connection between the upper and lower adjacent block bodies 1 are closely fitted after docking, and upper and lower joints are formed at the corresponding grooves, and the horizontal joints and the upper and lower joints are filled with mortar 7 for bonding (see Figure 5 , Figure 6 ), the block body 1 makes the steel fibers concentratedly distributed on the surface of the bonding layer by applying an external magnetic field. In this embodiment, the first protrusion structure and the second protrusion structure are both wavy protrusion structures.

[0031] In this embodiment, the front and rear side wall surfaces of the block body 1 are treated with plastering when the blocks are prefabricated, and the surface of the overall structure is clean and smooth.

[0032] like Figure 1 As shown, the following design case calculation is carried out on the size of the block to demonstrate the rationality of the design of the UHPC hollow block. The design block size is 390mm*190mm*190mm, the wall thickness is 20mm, the groove depth is 20mm, the width is 170mm, and the calculated structural hollow ratio is 65.6%. The size of the ordinary concrete hollow block of the same size is 390mm*190mm*190mm, the wall thickness is 30mm, and the calculated hollow ratio is about 52.6%. The UHPC bulk density is 2600kg / m 3 , the bulk density of ordinary concrete is 2400kg / m 3It is calculated that under the same size, the mass of UHPC hollow blocks is 12.6kg, and that of ordinary concrete blocks is 16.0kg. The mass of UHPC hollow blocks is 21.3% lighter than that of ordinary concrete hollow blocks.

[0033] The specific implementation process of the present invention is as follows: low-cost materials are used to prefabricate UHPC hollow blocks, the blocks are prefabricated in batches in the factory, and steam curing is used to quickly form the blocks, which can reduce early shrinkage and cracking of the blocks and improve the strength and overall performance of the blocks. The blocks are stacked in an alternating manner, the blocks are bonded horizontally, the bonding surface with grooves between the horizontal joints is connected to the bonding surface without grooves, the upper and lower joints are bonded vertically, and the left and right edges of the blocks are aligned with the horizontal partitions (see Figure 7 ). Horizontally bond the blocks, between the horizontal joints, the two sides are flat, the groove depth is 20mm, the width is 170mm, the edge thickness of the block is 10mm, and the wavy protrusions on both sides are staggered and arranged to increase the bonding area with the ultra-high performance mortar (UHPM) and give full play to its bonding effect. A gap of 3-5mm is left in the middle, and the ultra-high performance mortar (UHPM) is applied into the gap to achieve horizontal bonding of the blocks. For the vertical bonding of the block body 1, a full-length groove is set between the upper and lower joints, and the ultra-high performance mortar (UHPM) is applied into it to achieve vertical bonding of the blocks. The ultra-high performance mortar (UHPM) is used instead of ordinary mortar, which is similar in grade to the UHPC material used for the blocks and has better bonding performance. By setting the two-sided wavy protrusions to be staggered and arranged, the bonding area with the ultra-high performance mortar (UHPM) is increased to give full play to its bonding performance. By setting grooves and applying ultra-high performance mortar into the grooves, the blocks can be connected. Due to the high density of UHPC, the other surfaces of the blocks are smooth, and the overall block structure has no mortar joints, which makes the appearance more beautiful and eliminates the need for secondary painting.

[0034] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A high-performance prefabricated UHPC hollow paint-free building block, comprising a building block body (1) prefabricated with ultra-high performance concrete, characterized in that: The block body (1) is a hollow structure that is through-through from top to bottom, and a reinforcing partition (2) is provided in the hollow part to connect the front and rear side walls. A trapezoidal through-length groove (3) is provided in the middle of the left side wall of the block body (1), and a plurality of first convex structures (4) arranged in an undulating manner are provided on the inner concave surface of the trapezoidal through-length groove (3). A second convex structure (6) is provided in the middle of the right side wall of the block body (1) to correspond to the first convex structure (4), so that the outer walls of the connection of the left and right adjacent block bodies (1) are tightly fitted after being butt-jointed, and the middle part forms two sides. The invention provides a raised horizontal joint, and grooves (5) are correspondingly arranged on the upper and lower end surfaces of the block body (1) and the reinforcing partition plate (2), so that the outer walls of the joints of the upper and lower adjacent block bodies (1) are tightly fitted after being butted, and upper and lower joints are formed at the corresponding grooves (5). Mortar (7) is filled at the horizontal joints and the upper and lower joints for bonding. The block body (1) causes steel fibers to be concentratedly distributed on the surface of the bonding layer by applying an external magnetic field, and the coverage rate of the steel fibers on the surface of the bonding layer in the block body (1) is more than 30%, and the exposure rate of the steel fibers is more than 20%.

2. The high-performance prefabricated UHPC hollow paint-free building block according to claim 1, characterized in that: The hollow ratio of the building block body (1) is 60%-70%.

3. The high-performance prefabricated UHPC hollow paint-free building block according to claim 1, characterized in that: The first protruding structure (4) and the second protruding structure (6) are both wave-shaped protruding structures.

4. The high-performance prefabricated UHPC hollow paint-free building block according to claim 1, characterized in that: The horizontal joints and the upper and lower joints are filled with ultra-high performance mortar.

5. The high-performance prefabricated UHPC hollow paint-free building block according to claim 1, characterized in that: The front and rear side wall surfaces of the block body (1) are treated with plastering.

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