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A polymer material for repairing concrete cracks and its preparation method

A polymer material and concrete technology, applied in the field of concrete repair, can solve problems affecting the effectiveness of concrete crack repair, repair interface fatigue damage, concrete crack surface repair cannot meet high durability requirements, etc., to avoid cracks from regenerating, improve Effects of reactivity and toughness improvement

Active Publication Date: 2022-03-15
GUANGZHOU INSTITUTE OF BUILDING SCIENCE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual engineering, the influence of repeated loads on the performance of the concrete repair interface cannot be ignored, because under repeated loads, even if the load level is lower than the ultimate load, fatigue damage may occur at the repair interface of the stressed concrete members, resulting in the failure of surface repair of concrete cracks. Satisfy high durability requirements that seriously affect the effectiveness of concrete crack repair

Method used

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  • A polymer material for repairing concrete cracks and its preparation method
  • A polymer material for repairing concrete cracks and its preparation method
  • A polymer material for repairing concrete cracks and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A polymer material for repairing concrete cracks is prepared through the following process steps:

[0053] 1) Dissolve monomer b1 (140g) in 100g water to make solution (P1); mix a1 (10g) and c1 (6g) to make solution P2; dissolve 0.5g of mercaptopropionic acid and 0.25g of L-ascorbic acid In 50g of water, make solution P3;

[0054] 2) Warm up the solution P1 to 35°C, add 0.45g of hydrogen peroxide to the solution P1, then add the solutions P2 and P3 to the solution P1 at the same time, the time for adding the solution P2 is 3.0h, and the solution P3 Adding time is 3.5h;

[0055] 3) After all the dropwise addition is completed, continue the heat preservation reaction for 1 hour, and then add water to dilute to obtain a transparent liquid with a mass concentration of 40%.

[0056] 4) Add 0.4 g of triethylamine to water to prepare a 10% aqueous solution, quickly add it into 125 g of polymer solution (40%), and stir for 30 seconds to obtain a polymer repair solution.

[0...

Embodiment 2

[0059] A polymer material for repairing concrete cracks is prepared through the following process steps:

[0060] 1) Dissolve monomer b2 (120g) in 100g water to make solution P1; mix monomer a1 (8.5g) and monomer c1 (6g) to make solution P2; mix mercaptopropionic acid 0.5g and L-ascorbic acid Dissolve 0.3g in 50g of water to make solution P3;

[0061] 2) Warm up solution P1 to 35°C, add 0.45g of hydrogen peroxide to P1, then add solutions P2 and P3 to solution P1 at the same time. The time is 4.0h;

[0062] 3) After all the addition is completed, continue the heat preservation reaction for 1 hour, and then add water to dilute to obtain a transparent liquid with a mass concentration of 40%;

[0063] 4) Add 0.25 g of triethylamine to water to prepare a 10% aqueous solution, quickly add it into 125 g of polymer solution (40%), and stir for 30 seconds to obtain a polymer repair solution.

Embodiment 3

[0065] A polymer material for repairing concrete cracks is prepared through the following process steps:

[0066] 1) Dissolve monomer b1 (140g) in 100g water to make solution P1; mix monomer a2 (11.0g) and monomer c1 (5g) to make solution P2; mix mercaptopropionic acid 0.4g and L-ascorbic acid 0.35 g was dissolved in 50g of water to prepare solution P3;

[0067] 2) Warm up the solution P1 to 35°C, add 0.55g of hydrogen peroxide to the solution P1, then add the solutions P2 and P3 to the solution P1 at the same time, the time for adding the solution P2 is 3.0h, and the solution P3 Adding time is 3.5h;

[0068] 3) After all the addition is completed, continue the heat preservation reaction for 1 hour, and then add water to dilute to obtain a transparent liquid with a mass concentration of 40%;

[0069] 4) Add 0.5 g of triethylamine to water to prepare a 10% aqueous solution, quickly add it into 125 g of polymer solution (40%), and stir for 30 s to obtain a polymer repair solut...

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Abstract

The invention discloses a polymer material for repairing concrete cracks and a preparation method thereof. A polymer material for repairing concrete cracks and a preparation method thereof, which is composed of a silane polymer and a polycondensation catalyst; the molecular structure of the silane polymer contains silane groups and polyether groups; the preparation method of the silane polymer : obtained from silane monomers, polyether monomers and carboxylic acid monomers through radical copolymerization; the polycondensation catalyst is alkylamine. The cement slurry prepared by using the polymer and the catalyst has high cohesiveness, exhibits excellent weather resistance and durability, and has remarkable application value.

Description

technical field [0001] The invention relates to a polymer material, which belongs to the technical field of concrete repair, in particular to a polymer material for repairing concrete cracks and a preparation method thereof. Background technique [0002] Cement concrete has the advantages of high compressive strength, good durability and low cost, and has become the largest and most widely used building material at present. However, concrete has low tensile strength and high brittleness. During the construction and service of concrete structures, affected by various environmental conditions (temperature, humidity, load, etc.), concrete cracks of different sizes will inevitably occur. Harmful substances in the outside world penetrate into the concrete structure through cracks, causing water seepage in the concrete structure, and corroding its steel structure in severe cases, affecting the use function and service life of the concrete structure, and endangering the safety of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/42C08F283/06C08F220/06C08F230/08
CPCC04B40/0039C04B24/42C08F283/065C04B24/121C08F220/06
Inventor 孙申美黄福仁钟开红唐孟雄
Owner GUANGZHOU INSTITUTE OF BUILDING SCIENCE CO LTD