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Polymer material for repairing concrete cracks and preparation method thereof

A polymer material and concrete technology, applied in the field of concrete repair, can solve the problems affecting the effectiveness of concrete crack repair, repair interface fatigue damage, and the failure of concrete crack surface repair to meet high durability requirements.

Active Publication Date: 2020-07-07
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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  • Polymer material for repairing concrete cracks and preparation method thereof
  • Polymer material for repairing concrete cracks and preparation method thereof
  • Polymer material for repairing concrete cracks and preparation method thereof

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 0.25g of triethylamine into water to prepare a 10% aqueous solution, quickly add it into 125g of polymer solution (40%), and stir for 30s 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. The polymer material is formed by compounding a silane polymer and a polycondensation catalyst, wherein the molecular structure of the silane polymer contains a silane group and a polyether group. The preparation method of the silane polymer comprises the following steps of carrying out a free radical copolymerization reaction on a silane monomer, a polyether monomer and a carboxylic acid monomer to obtain the silane polymer. The polycondensation catalyst is alkylamine. Cement paste prepared from the polymer and the catalyst has high cohesiveness, excellent weather resistance and durability and 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 Applications(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