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Fiber reinforced high-strength mortar used for concrete structure repair

A concrete structure, fiber reinforced technology, applied in the field of building materials, can solve the problems of high environmental conditions, complex construction process, large building area, etc., to achieve the effect of convenient construction, environmental protection, and cost reduction

Active Publication Date: 2009-11-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods either occupy a large building area; or the construction process is complex and require high environmental conditions; or the cost is high; or the durability is poor; all have such and other shortcomings.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The fiber-reinforced high-strength mortar is composed of 1 part of PII-42.5 Portland cement, 0.2 part of ground blast furnace slag powder, 0.2 part of silica fume, 0.02 part of steel fiber, 0.012 part of polycarboxylate superplasticizer and 1.5 part of sand. Add 0.2 parts of water at the construction site or concrete mixing station and mix evenly, then manually pave or pump to form a smooth repair layer, and keep it moist for 5-7 days.

Embodiment 2

[0020] The fiber-reinforced high-strength mortar is composed of 1 part of PO-42.5 Portland cement, 0.25 part of silica fume, 0.15 part of fly ash, 0.15 part of limestone powder, 0.025 part of steel fiber, 0.013 part of polycarboxylate superplasticizer, and 1.5 part of sand. . Add 0.17 parts of water at the construction site or concrete mixing station, mix evenly, and carry out construction by manual paving or pumping to form a flat repair layer, moisturizing and curing for 5 to 7 days.

Embodiment 3

[0022] The fiber-reinforced high-strength mortar is composed of 1 part of PO-42.5 portland cement, 0.23 part of silica fume, 0.01 part of steel fiber, 0.01 part of polycarboxylate superplasticizer, and 1.3 parts of sand. Add 0.2 parts of water to the concrete mixing station and mix evenly, transport it to the site with a concrete delivery vehicle, pump it to the top surface of the bridge, and form a 20-30mm thick flat repair layer with an area of ​​more than 100m2 in a self-leveling way. Moisturizing and curing for 5~ After 7 days, its compressive strength exceeds 100MPa.

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PUM

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Abstract

The invention relates to a fiber reinforced high-strength mortar used for concrete structure repair, belonging to the technical field of building materials. The mortar is characterized in that the mortar is formed by mixing cement, activated and inert mineral admixtures, expanding agents, micro steel fibers, chemical admixtures, sand and the like based on a certain proportion. At the constructionfields or concrete batching plants, the mortar is added with right amount of water and the mixture is stirred evenly, transported to the construction sites and poured by hand spreading or pumping. Thefiber reinforced high-strength mortar has high strength, good volume stability and durability and large deformability, can be free of vibrating and self-leveling construction, and is convenient, fastand flexible in construction. The structure repair combination property of the fiber reinforced high-strength mortar is greatly superior to that of the current commonly used fine gravel concrete or steel wire mesh-polymer cement mortar system.

Description

technical field [0001] The invention relates to a fiber-reinforced high-strength mortar suitable for repairing concrete structures, and belongs to the technical field of building materials. Background technique [0002] At present, the commonly used repair methods for damaged concrete structures include: pouring a layer of fine stone concrete on the surface of the existing structure; installing steel mesh on the surface of the existing structure, and then plastering polymer cement mortar; pasting steel plates or carbon fiber cloth, etc. These methods either occupy a large building area; or the construction process is complex and require high environmental conditions; or the cost is high; or the durability is poor; all have such and other shortcomings. [0003] Ultra-high performance concrete (UHPC) is an ultra-high-strength fiber-reinforced cement-based material that has developed rapidly in recent years, and has been used to manufacture building components and bridges. Ult...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B14/48C04B14/06C04B111/72
CPCC04B2111/20C04B2111/34C04B2111/72C04B28/04Y02W30/91C04B14/06C04B14/28C04B14/48C04B18/08C04B18/141C04B18/146C04B22/008C04B2103/20C04B2103/302C04B2103/50C04B14/106C04B24/2641C04B2103/0079
Inventor 阎培渝
Owner TSINGHUA UNIV
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