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Underwater anti-dispersing quick repairing material and preparation method thereof

A repair material and anti-dispersion technology, which is applied in the field of underwater anti-dispersion rapid repair materials and its preparation, can solve the problems of low bonding strength, poor dispersion resistance, time-consuming and labor-intensive problems on wet base surfaces, and achieve improved compactness and improved wetness. state adhesiveness, air bubble reduction effect

Inactive Publication Date: 2017-08-29
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the poor dispersion resistance of the existing concrete repair materials in water and the low bond strength with the wet base surface, hydraulic concrete projects cannot be repaired underwater at present. Most of them use methods such as cofferdams to drain water and then repair them This repair method is not only expensive, but also time-consuming and laborious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] An underwater anti-dispersion rapid repair material is prepared as follows:

[0023] (1) Weigh 80 parts of R.SAC42.5 sulfoaluminate cement, 20 parts of P.O42.5 ordinary Portland cement, 2 parts of anionic polyacrylamide (molecular weight ≥ 12 million), polycarboxylic acid high-efficiency 2 parts of water, 8 parts of vinyl acetate-ethylene-acrylate copolymer latex powder, 150 parts of quartz sand (fineness: 50-100 mesh), 0.25 parts of P803 silicone defoamer, 45 parts of water;

[0024] (2) Dissolve the weighed water reducer in the weighed water for subsequent use;

[0025] (3) adding the weighed sulphoaluminate cement, Portland cement, quartz sand, flocculant, redispersible latex powder, and defoamer into the stirring pot, and stirring for 60 seconds to obtain a dry mix;

[0026] (4) Add the solution prepared in step (2) to the dry mix in step (3), and stir for 120 seconds to obtain an underwater anti-dispersion rapid repair material.

[0027] Test the underwater initi...

Embodiment 2

[0033] An underwater anti-dispersion rapid repair material, the distribution ratio of each component is calculated in parts by weight: Weigh 80 parts of R.SAC42.5 sulfoaluminate cement, 20 parts of P.O42.5 ordinary Portland cement, acetic acid Vinyl-ethylene-acrylate copolymer latex powder 1.5 parts, polycarboxylate superplasticizer 2 parts, vinyl acetate-ethylene-acrylate copolymer latex powder 8 parts, quartz sand (fineness: 50-100 mesh) 150 parts, 0.25 parts of P803 silicone defoamer, 45 parts of water.

[0034] The preparation method and performance test are the same as in Example 1. The performance test results of the prepared patching material are as follows: the initial setting time under water is 22min, and the final setting time is 48min; The underwater compressive strength is 46.2MPa; the 1d underwater flexural strength is 3.1MPa, and the 28d underwater flexural strength is 6.8MPa; the 1d water-land strength ratio is 70%, and the 28d water-land strength ratio is 88%...

Embodiment 3

[0036] An underwater anti-dispersion rapid repair material, the distribution ratio of each component is calculated in parts by weight: Weigh 80 parts of R.SAC42.5 sulfoaluminate cement, 20 parts of P.O42.5 ordinary Portland cement, acetic acid Vinyl-ethylene-acrylate copolymer latex powder 2 parts, polycarboxylate superplasticizer 2 parts, vinyl acetate-ethylene-acrylate copolymer latex powder 10 parts, quartz sand (fineness: 50-100 mesh) 150 parts, 0.25 parts of P803 silicone defoamer, 45 parts of water.

[0037] The preparation method and performance test are the same as in Example 1. The performance test results of the prepared patching material are as follows: the initial setting time under water is 24min, and the final setting time is 50min; The underwater compressive strength is 47.1MPa; the 1d underwater flexural strength is 2.8MPa, and the 28d underwater flexural strength is 5.7MPa; the 1d water-land strength ratio is 74%, and the 28d water-land strength ratio is 90%....

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Abstract

The invention belongs to the field of quick repairing for hydraulic concrete and specifically relates to an underwater anti-dispersing quick repairing material and a preparation method thereof. The repairing material comprises the following components in parts by weight: 70-90 parts of sulphate aluminum cement, 10-30 parts of ordinary Portland cement, 1-2 parts of flocculant, 1-2.5 parts of a water reducing agent, 6-14 parts of redispersible latex powder, 150-200 parts of quartz sand, 0.15-0.25 part of a de-foaming agent and 35-50 parts of water. When the repairing material disclosed by the invention is applied to the repairing engineering of hydraulic concrete, under the synergistic effect of the components, the repairing material has the advantages of excellent underwater anti-dispersing property, short setting time, high adhesive strength with a concrete wet interface and mechanical property stability.

Description

technical field [0001] The invention belongs to the field of quick repair of hydraulic concrete, in particular to an underwater anti-dispersion quick repair material and a preparation method thereof. Background technique [0002] In the past ten years, the application of concrete in hydraulic engineering has developed rapidly, and a large number of reservoir dams, hydropower stations, water aqueducts, pipe culverts, and channels are all built of concrete materials. However, due to the low tensile strength of concrete itself, it is prone to cracks due to the influence of temperature difference and self-shrinkage and other factors. Cracks not only endanger the structural safety of hydraulic structures, but also cause leakage, aggravate the chemical corrosion of concrete, freeze-thaw damage, corrosion of steel bars and the occurrence of alkali-aggregate reactions, and threaten the safe operation of hydraulic structures. Decreases the durability of hydraulic concrete. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B111/74C04B111/72
CPCC04B28/06C04B2111/72C04B2111/74C04B7/02C04B24/2652C04B2103/302C04B24/2688C04B14/06C04B24/42
Inventor 余剑英刘宁薛理辉查亚刚吴敏顾怡李颖晏石林
Owner WUHAN UNIV OF TECH
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