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High-performance nanofiber modified polymer cement-based repairing mortar and preparation method thereof

A nanofiber and polymer technology is applied in the field of high-performance nanofiber-modified polymer cement-based repair mortar and its preparation, which can solve the problems of long setting time, general crack resistance, mismatch of elastic modulus of base concrete, etc.

Inactive Publication Date: 2019-08-23
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] There are still some problems in the application of some polymer cement-based repair materials that are widely used at present. For example, polymer cement-based materials have long setting time, low early strength, low compressive strength, large shrinkage, and general crack resistance. The decrease of the elastic modulus (may cause a mismatch with the base concrete elastic modulus) and other shortcomings, and the use of multiple methods of composite modification can greatly make up for the lack of single modification of the polymer, such as polymer and ultrafine mineral admixtures, polymerization Compound modification with various admixtures, polymers and fiber materials, and polymers and nanomaterials is a development direction worthy of further research, and the mechanical bonding performance and durability of polymer cement-based materials can be further improved through compound modification. Performance, and the application range of polymer cement-based repair materials will be further expanded

Method used

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  • High-performance nanofiber modified polymer cement-based repairing mortar and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 A high-performance nanofiber modified polymer cement-based repair mortar, the repair mortar is composed of the following raw materials in mass percentage (kg): 29.5% cement, 52.7% quartz sand, 1.4% dispersible latex powder, nano SiO 2 0.4%, fly ash 3.5%, metakaolin 1.8%, fiber 0.07%, water reducing agent 0.18%, silicone defoamer 0.03%, cellulose ether 0.01%, and the balance is water.

[0036] The preparation method of the high-performance nanofiber modified polymer cement-based repair mortar comprises the following steps:

[0037] (1) Weighing according to the proportion;

[0038] (2) Add water reducer and silicone defoamer to 80% water, and then add nano-SiO 2 Add it, and stir rapidly in a cement mortar mixer for 1 to 2 minutes to obtain a mixed solution;

[0039] (3) Move the mixed solution to a digitally controlled ultrasonic cleaner, and disperse it with ultrasonic waves for 15 minutes to obtain a suspension;

[0040] (4) Pour cement, quartz sand, disper...

Embodiment 2

[0041] Example 2 A high-performance nanofiber modified polymer cement-based repair mortar, which is composed of the following raw materials in mass percentage (kg): 27.2% cement, 52.4% quartz sand, 1.7% dispersible latex powder, nano SiO 2 0.7%, fly ash 4.4%, metakaolin 2.6%, fiber 0.1%, water reducer 0.21%, silicone defoamer 0.035%, cellulose ether 0.017%, and the balance is water.

[0042] The preparation method of the high-performance nanofiber modified polymer cement-based repair mortar is the same as that in Example 1.

Embodiment 3

[0043] Example 3 A high-performance nanofiber modified polymer cement-based repair mortar, the repair mortar is composed of the following raw materials in mass percentage (kg): 25.0% cement, 52.2% quartz sand, 2.0% dispersible latex powder, nano SiO 2 1.0%, fly ash 5.2%, metakaolin 3.5%, fiber 0.14%, water reducer 0.24%, silicone defoamer 0.04%, cellulose ether 0.02%, and the balance is water.

[0044] The preparation method of the high-performance nanofiber modified polymer cement-based repair mortar is the same as that in Example 1.

[0045] In the above-mentioned Examples 1-3, the cement is 52.5 grade ordinary Portland cement.

[0046] Quartz sand refers to a mixture of 20-40 mesh quartz sand, 40-70 mesh quartz sand, and 70-140 mesh quartz sand in a mass ratio of 5:4:1.

[0047] Redispersible latex powder refers to an ethylene-vinyl acetate copolymer with a minimum film-forming temperature of 4°C, a particle size of 400 μm, and a sieve residue of no more than 4%.

[0048...

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Abstract

The invention relates to a high-performance nanofiber modified polymer cement-based repairing mortar. The repairing mortar comprises, by mass, 25.0-29.5% of cement, 52.2-52.7% of quartz sands, 1.4-2.0% of dispersible latex powder, 0.4-1.0% of nano-SiO2, 3.5-5.2% of fly ash, 1.8-3.5% of metakaolin, 0.07-0.14% of fibers, 0.18-0.24% of a water reducer, 0.03-0.04% of a silicone antifoaming agent, 0.01-0.02% of cellulose ether, and the balance of water. The invention discloses a preparation method of the repairing mortar. The method of the invention is simple and is easy to implement, and the obtained repairing mortar has excellent performances, and is suitable for repairing the reinforced concrete structure.

Description

technical field [0001] The invention relates to the technical field of preparation of cement-based material structural repair materials, in particular to a high-performance nanofiber modified polymer cement-based repair mortar and its preparation. Background technique [0002] During the service period of the concrete structure, due to the load and external factors, the surface is prone to defects such as porosity and spalling, and even micro-cracks inside the material. If these defects cannot be repaired in time, external water and corrosive media will gradually infiltrate from the surface defects of the material, which will eventually lead to accelerated deterioration of the durability of concrete. Accidents of concrete structures failing due to cracking, erosion, loosening and other reasons occur frequently, which not only brings huge economic losses to the country, but also seriously threatens people's personal safety. [0003] In the saline soil area in western my coun...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B111/20C04B111/72
CPCC04B28/04C04B2111/20C04B2111/723C04B2201/10C04B2201/50C04B14/06C04B2103/0054C04B14/062C04B18/08C04B14/106C04B24/42C04B24/383C04B2103/302C04B16/0633C04B18/26
Inventor 李刊魏智强乔宏霞路承功黄尚攀乔国斌于剑桥
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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