High-strength ground repairing mortar

A repairing mortar and high-strength technology, applied in the field of mortar, can solve the problems of poor compatibility of cement substrates, high cost, slow strength development, etc., to shorten the initial setting time, improve the self-sealing performance, and increase the initial strength. Effect

Inactive Publication Date: 2020-08-28
JIANGSU LETONG COLOR IND NEW BUILDING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has poor compatibility with cement substrates, high cost, slow early strength development, poor durability, and some products pollute the environment.
The last one is polymer modified repair materials, which use polymers to modify cement-based materials. Although the compatibility between repair materials and cement substrates is improved to a certain extent, and the risk of shrinkage and cracking is reduced, there are also Disadvantages of slow early strength development and high cost

Method used

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  • High-strength ground repairing mortar

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Select the following raw materials by mass: 300 parts of 42.5 grade ordinary silicon cement, 200 parts of 42.5 grade sulfoaluminum cement, 50 parts of finely ground calcium powder (1-3 μm), 350 parts of river sand, 0.4 part of sodium citrate and 0.6 part of tartaric acid Ingredients: 0.5 parts of chopped polypropylene fiber, 1 part of hydroxypropyl methylcellulose, 20 parts of polyvinyl alcohol powder, 0.5 parts of silicone defoamer, 0.5 parts of calcium formate, 60 parts of gypsum, 220 parts of water, the above The weighed raw materials were stirred for 5 minutes under the action of a mixer to obtain a paddle body mortar.

[0022] The method of using this mortar is: 1) Dig the surface of the substrate to be repaired to a depth of 5mm, and extend the excavation 10cm to the surroundings;

[0023] 2) Dig a certain amount of mortar, apply it to the repaired area, and smooth it with a scraper to solidify.

[0024] The mortar samples after 2h and 25 days after curing were t...

Embodiment 2

[0026] Select the following raw materials by mass: 350 parts of 42.5 grade ordinary silicon cement, 250 parts of 42.5 grade sulfur aluminum cement, 100 parts of finely ground calcium powder (1-3 μm), 350 parts of river sand, 2 parts of sodium citrate and 3 parts of tartaric acid Preparation, 1 part of chopped polypropylene fiber, 2 parts of hydroxypropyl methylcellulose, 25 parts of polyvinyl alcohol powder, 0.8 part of silicone defoamer, 0.8 part of calcium formate, 80 parts of gypsum, 280 parts of water, the above The weighed raw materials were stirred for 5 minutes under the action of a mixer to obtain a paddle body mortar.

Embodiment 3

[0028] Take the following raw materials by mass: 325 parts of 42.5 grade ordinary silicon cement, 225 parts of 42.5 grade sulfur aluminum cement, 75 parts of finely ground calcium powder (1-3μm), 350 parts of river sand, 1 part of sodium citrate and 1.5 parts of tartaric acid Ingredients: 0.75 parts of chopped polypropylene fiber, 1.5 parts of hydroxypropyl methylcellulose, 22.5 parts of polyvinyl alcohol powder, 0.65 parts of silicone defoamer, 0.65 parts of calcium formate, 70 parts of gypsum, 250 parts of water, the above The weighed raw materials were stirred for 5 minutes under the action of a mixer to obtain a paddle body mortar.

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Abstract

The invention provides a novel high-strength repair mortar. After a formula is optimized, the high-strength repair mortar with high initial setting speed, high initial strength and high self-sealing performance is obtained. The mortar is prepared from, by mass, 300-350 parts of ordinary portland cement, 200-250 parts of sulphoaluminate cement, 50-100 parts of coarse whiting (calcium carbonate), 350 parts of river sand, 1-5 parts of a retarder, 0.5-1 part of fibers, 1-2 parts of hydroxypropyl methyl cellulose, 20-25 parts of rubber powder, 0.5-0.8 part of an organic silicon defoamer, 0.5-0.8 part of an early strength agent, 60-80 parts of gypsum and 220-280 parts of water. The raw materials are weighed, and are stirred for 5 min in a forced physical stirring mode to obtain the slurry-shapedrepairing mortar.

Description

technical field [0001] The invention relates to the technical field of mortar, in particular to a high-strength, self-compacting high-strength ground repair mortar. Background technique [0002] At present, the repair materials on the market are mainly divided into three types: one is inorganic repair materials, including ordinary mortar with ordinary cement as the main cementitious material and special mortar with special cement as the main cementitious material. The material has good material compatibility, but the former has slow early strength development, low bond strength, easy shrinkage, and poor repair effect, while the latter, although the early strength develops quickly, is prone to shrinkage in the later stage of strength, and the old and new concrete are prone to shrinkage due to strength. Development differences and differences in elastic modulus lead to problems such as bond failure. The other is a polymer repair material, which is mainly a type of repair mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B111/60C04B111/72
CPCC04B28/14C04B2111/60C04B2111/72C04B7/323C04B7/02C04B14/28C04B14/068C04B24/06C04B16/0633C04B24/383C04B24/2623C04B24/42C04B24/04
Inventor 高正平崔文龙王恒所
Owner JIANGSU LETONG COLOR IND NEW BUILDING MATERIALS CO LTD
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