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A high-ductility cement-based material for repairing hydraulic drainage structures and its preparation method

A technology for drainage structures and cement-based materials, applied in the field of materials, can solve problems such as the opening of the repair layer, the bulging of the repair layer, and the damage of the repair layer, and achieve a wide range of raw material sources, high impact and wear resistance, and construction simple craftsmanship

Active Publication Date: 2017-04-19
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-strength concrete has strong anti-wear performance, but high-strength concrete is easy to crack, and the cracks gradually expand under the impact of water pressure and moving mass, and the repair layer is often destroyed from the cracks
When repairing with high-strength organic materials such as epoxy mortar or sprayed polyurea, the material itself has excellent adhesion and abrasion resistance. However, since the thermal expansion coefficient of epoxy and polyurea is 2~ 3 times, the temperature deformation between the repair layer and the substrate is not coordinated. After several cycles of cold and heat, the repair layer begins to partially bulge and debond, which eventually leads to the entire repair layer being lifted and failing; at the same time, epoxy and polyurea Volatile substances in organic compounds will also have adverse effects on the health of construction workers

Method used

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  • A high-ductility cement-based material for repairing hydraulic drainage structures and its preparation method
  • A high-ductility cement-based material for repairing hydraulic drainage structures and its preparation method
  • A high-ductility cement-based material for repairing hydraulic drainage structures and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0034] The composition ratio of materials is shown in Table 1:

[0035] Table 1 Mixing ratio of repairing materials for hydraulic drainage structures (mass parts)

[0036]

[0037] The raw materials used are:

[0038] The cement is P·O 42.5 cement, the maximum particle size of brown corundum is 0.5mm, and the volume average diameter D(4,3) of microbeads is 95nm; nano-CaCO 3 The average volume diameter D(4,3) of the polycarboxylate superplasticizer is 24.5nm, the water reducing rate is 30%, the equivalent diameter of the chopped PVA fiber is 40μm, and the tensile strength is 1550MPa.

[0039] The elastic modulus is 39GPa; the equivalent diameter of ultra-fine steel fibers is 0.16mm, and the aspect ratio is 50.

[0040] The mixing process of repairing materials for hydraulic drainage structures is as follows:

[0041] (1) First mix cement, microbeads, and nano-CaCO 3 , Pour the brown corundum into the blender and stir for 3 minutes.

[0042] (2) Add water reducer and wat...

Embodiment 2

[0050] The composition ratio of materials is shown in Table 2:

[0051] Table 2 Mixing ratio of hydraulic drainage building repair materials (mass parts)

[0052]

[0053] The raw materials used are:

[0054] The cement is P·O 52.5 cement, the maximum particle size of brown corundum is 1.25mm, and the volume average diameter of microbeads D(4,3) is 100nm; nano-CaCO 3 The volume average diameter D(4,3) is 24.5nm, polycarboxylate high-performance water reducing agent, water reducing rate is 25%, equivalent diameter of chopped PVA fiber is 40μm, tensile strength is 1550MPa, elastic modulus is 39GPa; ultrafine The steel fiber equivalent diameter is 0.10 mm, and the aspect ratio is 60.

[0055] The mixing process of repair materials for hydraulic drainage structures is as follows:

[0056] (1) First mix cement, microbeads, and nano-CaCO 3 , Pour the brown corundum into the blender and stir for 3 minutes.

[0057](2) Add water reducer and water, stir for 3 minutes to obtain ...

Embodiment 3

[0065] The composition ratio of materials is shown in Table 3:

[0066] Table 3 Mixing ratio of repairing materials for hydraulic drainage structures (mass parts)

[0067]

[0068] The raw materials used are:

[0069] The cement is P·O 42.5 cement, the maximum particle size of brown corundum is 1.5mm, and the volume average diameter D(4,3) of microbeads is 90nm; nano-CaCO 3 The volume average diameter D(4,3) is 25nm, polycarboxylate high-performance water reducing agent, water reducing rate is 40%, chopped PVA fiber equivalent diameter is 40μm, tensile strength is 1550MPa, elastic modulus is 39GPa; ultra-fine steel The fiber equivalent diameter is 0.20 mm, and the aspect ratio is 65.

[0070] The mixing process of repairing materials for hydraulic drainage structures is as follows:

[0071] (1) First mix cement, microbeads, and nano-CaCO 3 , Pour the brown corundum into the blender and stir for 3 minutes.

[0072] (2) Add water reducer and water, stir for 3 minutes to ...

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Abstract

The invention discloses a high-ductility cement-based material for repairing hydraulic outlet works, and a preparation method thereof. The material comprises, by weight, 100 parts of cement, 25-150 parts of water, 50-250 parts of brown fused alumina, 20-450 parts of microspheres, 0.5-20 parts of nano-CaCO3, 0.1-5 parts of a water reducer, 0.95-15 parts of PVA fibers and 2-20 parts of ultrafine steel fibers. The high-ductility cement-based material for repairing hydraulic outlet works has the advantages of high impact and wear strength, high bonding strength with a matrix, high ductility, similar thermal expansion coefficient with concrete, consistence with deformation of the matrix concrete, simple and convenient construction process, and wide sources of raw materials.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a high-ductility cement-based material for repairing hydraulic drainage structures and a preparation method thereof. Background technique [0002] Abrasive damage to the concrete surface of discharge structures caused by high-speed water flow containing drift and suspended drift is a common disease in the construction and operation of water conservancy and hydropower projects. Diversion tunnels, overflow dams, spillways, flood tunnels, sluice slabs, aprons, stilling piers, water cushion ponds, secondary dams, bottom slabs and side walls of drainage bottom holes, etc. The erosion and wear of sandy water flow and the impact of moving mass produce erosion and abrasion damage. Since the diversion tunnel floor and side walls of Zipingpu Reservoir were diverted in 2002, due to the erosion of the moving mass, the surface wear is relatively common, and local erosion pits h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00
Inventor 郭丽萍陈波谌正凯张文潇
Owner SOUTHEAST UNIV
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