Repair mortar, and preparation method and construction method thereof

A technology for repairing mortar and sand, which is applied in building maintenance, sustainable waste treatment, solid waste management, etc., can solve problems such as single function, high cost, and small application range, so as to reduce adsorption, reduce delay effect, and improve dispersion effect Effect

Active Publication Date: 2020-08-11
NAT ENG LAB FOR HIGH SPEED RAILWAY CONSTR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The thixotropic cement-based materials obtained in the above patents have the problems of high cost, single function, and small application range
[0006] In summary, there is an urgent need for a repair mortar, its preparation method and construction method to solve the problems of high cost, single function and small application range of thixotropic cement-based materials in the prior art

Method used

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  • Repair mortar, and preparation method and construction method thereof
  • Repair mortar, and preparation method and construction method thereof
  • Repair mortar, and preparation method and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of repair mortar, including the following raw materials in mass percentage: Portland cement 25%, expansion agent 4%, polymer emulsion 5%, viscosity modifier 0.2%, water 8%, powder water reducing agent 0.4%, composite fiber 0.3%, 0.08% of superabsorbent resin and the rest of sand, the expansion agent includes wollastonite needle powder, potassium feldspar powder and magnesium oxide, and the magnesium oxide has been calcined.

[0033] The expansion agent is composed of wollastonite acicular powder, potassium feldspar powder and magnesium oxide, wherein the mass ratio of the wollastonite acicular powder to the repair mortar is 0.5%, and the mass ratio of the potassium feldspar powder to the repair mortar is 0.5%, the mass ratio of magnesium oxide to repair mortar is 3%.

[0034] The fineness of the wollastonite acicular powder is 1000 mesh, and the aspect ratio of the particles is 10:1; the fineness of the potassium feldspar powder is 400 mesh; the calcination tempe...

Embodiment 2

[0048] The difference from Example 1 is that the repair mortar contains 30% of Portland cement, 6% of polymer emulsion, 0.1% of viscosity modifier, 10% of water, 0.6% of powder water reducer, 0.5% of composite fiber and high Water absorbent resin 0.1%. Other conditions are with embodiment 1.

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Abstract

The invention provides repair mortar, and a preparation method and a construction method thereof. The repair mortar comprises the following raw materials: Portland cement, an expanding agent, a polymer emulsion, a viscosity modifier, water, a powder water reducing agent, composite fibers, super absorbent resin and sand. The preparation method comprises the following steps: S1, uniformly mixing wollastonite acicular powder, potassium feldspar powder and the polymer emulsion to prepare a mixture A; S2, uniformly mixing the Portland cement, magnesium oxide, a viscosity modifier, the powder waterreducing agent, the composite fibers, the super absorbent resin and the sand to obtain a mixture B; and S3, uniformly mixing water with the mixture A and the mixture B to prepare the repair mortar. The construction method comprises the following steps: step W1, pretreating a construction surface of a concrete matrix to be repaired; and step W2, directly molding the repair mortar prepared in the step S3 on a pretreated construction surface. The repair mortar provided by the invention has good thixotropy.

Description

technical field [0001] The invention relates to the technical field of concrete materials, in particular to a repair mortar, a preparation method and a construction method thereof. Background technique [0002] Concrete structures generally face serious durability problems, which greatly reduces the durability and service life of concrete, and also directly promotes the development of the concrete repair industry. Concrete repair works are mainly divided into two categories: structural repair and non-structural repair. Among them, the concrete problems dealt with by non-structural repairs are generally cracks and peeling on the entire exposed surface, or cracks and defects in non-main stress-bearing parts. For non-structural repairs, it is mainly to replace the problematic parts of the concrete structure with repair materials. However, non-structural repair is also a complex engineering problem that needs to take into account the macro and micro properties of concrete. Ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/18E04G23/02C04B111/72
CPCE04G23/0218C04B28/18C04B2111/72C04B7/02C04B14/045C04B22/066C04B24/2676C04B24/383C04B22/002C04B2103/302C04B14/068C04B14/42C04B16/0633C04B14/4643C04B24/2641Y02W30/91
Inventor 元强左胜浩余志武黄庭杰
Owner NAT ENG LAB FOR HIGH SPEED RAILWAY CONSTR
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