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A steel wire mesh reinforced ultra-high performance concrete cover slab and preparation method thereof

An ultra-high performance, concrete cover technology, applied in building materials and other directions, can solve the problems of shortening the service life of the cover plate, containing too much steel fiber, accelerating the corrosion of steel bars, etc., so as to delay the development of cracks, reduce the possibility of corrosion, improve the The effect of bearing capacity and durability

Active Publication Date: 2017-10-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the relatively uniform distribution of steel fibers in the cover plate, the upper part of the cover plate bearing compressive stress contains too much steel fiber, resulting in waste; the amount of steel fiber at the bottom of the cover plate bearing tensile stress is too small, and the crack resistance cannot be fully utilized effect
Under the large occasional load or long-term load (such as the rolling or parking of heavy-duty vehicles), the cover plate will still crack early and accelerate the corrosion of steel bars, which will greatly affect the durability of the cover plate. Adverse effects, greatly shortening the service life of the cover plate

Method used

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  • A steel wire mesh reinforced ultra-high performance concrete cover slab and preparation method thereof
  • A steel wire mesh reinforced ultra-high performance concrete cover slab and preparation method thereof
  • A steel wire mesh reinforced ultra-high performance concrete cover slab and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as Figure 1 to Figure 3 As shown, a steel mesh reinforced ultra-high performance concrete cover plate, the size of the cover plate is 1200mm × 500mm × 40mm, including an ultra-high performance concrete layer 3, and the ultra-high performance concrete layer 3 is tightly packed from top to bottom The reinforcement frame and the steel wire mesh 4 parallel to the lower end surface of the cover plate are arranged in a fit manner, the steel wire mesh 4 is 10 mm away from the lower end surface of the cover plate, and the distance between the steel reinforcement frame and the steel wire mesh is 15 mm from the four sides of the cover plate, and the steel reinforcement frame is mainly composed of The longitudinally arranged stress bars 1 and the transversely arranged distribution bars 2 are welded or bundled, and the distribution bars 2 are located above the stress bars 1 .

[0034] In this embodiment, the distribution bar 2 adopts the HPB300 steel bar with a diameter of 8 ...

Embodiment 2

[0042]The difference between this embodiment and Embodiment 1 is that the steel wire mesh 4 is made of fine steel wires with a diameter of 1.0mm, the aperture of the steel wire mesh 4 is 3.5cm×3.5cm, and the meshing method of the steel wire mesh 4 is thin steel wires. Cross braid. The measured fluidity of the ultra-high performance concrete is 185 mm, and the measured compressive strength is 172.8 MPa. The steel fibers contained therein are selected from common copper-plated steel fibers with a diameter of 0.18 mm and a length of 14 mm. Described steel fiber addition is 1.4% of concrete volume addition;

[0043] The 3.5cm×3.5cm aperture steel mesh reinforced ultra-high-performance concrete cover slab used in this embodiment has a crack load of 18.7kN and a failure load of 40.3kN. The test method refers to China Southern Power Grid's "Cable Trench Cover Standard Technical Bidding Document"

[0044] In the comparison experiment of preparing ultra-high performance concrete cov...

Embodiment 3

[0047] A preparation method of the ultra-high performance concrete cover slab reinforced by steel wire mesh as described in embodiment 1, comprising steps:

[0048] 1) The size of the cover plate is 1200mm×500mm×40mm. According to the size of the cover plate and the thickness of the protective layer, process the steel frame and steel wire mesh 4, and the steel wire mesh 4 is a single-layer mesh with a size of 1380mm×480mm;

[0049] 2) Connect and fix the steel wire mesh 4 with the steel frame so that the steel wire mesh 4 is parallel to the steel frame and located on the side of the steel frame under stress 1, and make the two fit closely;

[0050] 3) Hang the fixed wire mesh 4 and the steel frame into the mold cavity, place the steel wire 4 upwards, 10mm away from the top of the mold, and leave a protective layer thickness of 15mm on the four sides of the steel frame and steel wire 4 , used to fill ultra-high performance concrete;

[0051] 4) Prepare ultra-high-performance ...

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Abstract

The invention discloses an ultra-high-performance concrete cover slab reinforced by a steel wire mesh, which comprises an ultra-high-performance concrete layer, and steel bars parallel to the lower end surface of the cover slab are arranged in the ultra-high-performance concrete layer from top to bottom to closely fit. Skeleton and steel wire mesh, the steel wire mesh is 10-20mm away from the lower end of the cover plate, the distance between the steel bar frame and the steel wire mesh is 10-20mm from the four sides of the cover plate, and the steel bar frame is mainly composed of longitudinally arranged stress bars and horizontally arranged distribution The ribs are welded or bundled, and the distribution ribs are located above the stressed tendons. The invention also provides a method for preparing the ultra-high-performance concrete cover plate reinforced by the steel wire mesh. The invention can improve the distribution of steel fibers in the cover plate, give full play to the crack resistance effect of the steel fiber, improve the fracture toughness of concrete, thereby delay the development of cracks in the cover plate, and finally improve the bearing capacity and durability of cover plate products.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a steel mesh reinforced ultra-high performance concrete cover plate and a preparation method thereof. Background technique [0002] Ultra-High Performance Concrete, referred to as UHPC (Ultra-High Performance Concrete), is the most innovative cement-based engineering material in the past three decades. It has achieved a great leap in the performance of engineering materials. One of its representatives is reactive powder concrete. [0003] Reactive Powder Concrete (RPC for short): It is composed of multi-component active powder admixtures, inorganic cementitious materials, continuous graded fine aggregates, steel fibers and other mixed fibers. Through optimal gradation design, the material Internal defects (pores and micro-cracks) are minimized, and it is a new cement-based composite material with ultra-high strength, high toughness, high durability, high crack resist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04C2/06
Inventor 杨医博黄鸿浩冼剑华郭文瑛潘文智蔡铉烨王恒昌廖芮谭志健刘金涛谭颖垚郭振海
Owner SOUTH CHINA UNIV OF TECH