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Additive for improving self-repairing property of concrete cracks

A self-healing, concrete technology, applied in the field of additives, can solve the problems of poor reliability and high cost of microcapsule preparation

Inactive Publication Date: 2015-12-02
上海惠邦特种涂料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the preparation cost of microcapsules is relatively high, and in the process of use, the self-healing effect is realized based on the rupture of the microcapsules when the cracks are generated, and its reliability is relatively poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The formulation used is shown below and the additive was used in the concrete at 0.1% of the amount of cement.

[0028] Composition ratio / %w.t.

[0029] Sodium tartrate 60;

[0030] Sodium salicylate 0;

[0031] sodium citrate 0;

[0032] Sodium malate 5;

[0033] Sodium gluconate 5;

[0034] Sodium polycarboxylate 20;

[0035] Sodium carbonate 10;

[0036] Lithium Carbonate 10.

[0037] The prepared concrete has an initial setting time of 60 minutes and a final setting time of 5 hours. The self-repairing property refers to GB18445~2012 to test the secondary impermeability strength of the concrete, and the result is 1.1 MPa.

Embodiment 2

[0039] The formulation used is shown below and the additive was used in the concrete at 0.2% of the amount of cement.

[0040] Composition ratio / %w.t.

[0041] Sodium tartrate 5;

[0042] Sodium salicylate 20;

[0043] Sodium citrate 5;

[0044] Sodium malate 5;

[0045] Sodium gluconate 5;

[0046] Sodium polycarboxylate 40;

[0047] sodium carbonate 0;

[0048] Lithium Carbonate 20.

[0049] Among them, the total amount of organic sodium salts such as sodium tartrate and sodium salicylate is not less than 60%.

[0050] The prepared concrete has an initial setting time of 40 minutes and a final setting time of 3 hours. The self-repairing property refers to GB18445~2012 to test the secondary impermeability strength of the concrete, and the result is 0.9MPa.

Embodiment 3

[0052] The formulation used is shown below and the additive was used in the concrete at 0.5% of the amount of cement.

[0053] Composition ratio / %w.t.

[0054] sodium tartrate 0;

[0055] Sodium salicylate 0;

[0056] sodium citrate 0;

[0057] Sodium malate 40;

[0058] Sodium Gluconate 40;

[0059] Sodium polycarboxylate 0;

[0060] Sodium Carbonate 20;

[0061] Lithium Carbonate 0.

[0062] The prepared concrete has an initial setting time of 90 minutes and a final setting time of 8 hours. The self-repairing property refers to GB18445~2012 to test the secondary impermeability strength of the concrete, and the result is 1.4MPa.

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PUM

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Abstract

The invention discloses an additive for improving the self-repairing property of concrete cracks. The additive for promoting self-repairing of concrete is prepared by adopting a retarding type ion chelating agent and / or an inorganic salt type settling promotor; the retarding type ion chelating agent comprises organic acid salt and / or poly organic acid salt; the inorganic salt type settling promotor comprises sodium carbonate and / or lithium carbonate. According to the additive, the concentration of calcium ions is increased under the chelate action of the organic acid salt on the calcium ions; organic salt of the calcium ions can move with water, so that the concentration of the calcium ions in the cracks is increased; with the increase of the concentration of the calcium ions, hydration of components which are not hydrated in the concrete can be promoted, and self-repairing of the cracks is completed; generally, the organic acid salt has the retarding effect, and the retarding effect of the organic acid salt is balanced through addition of sodium carbonate and lithium carbonate.

Description

technical field [0001] The invention relates to a crack self-healing additive for cement concrete. Background technique [0002] During the use of concrete, it will be damaged under the action of temperature changes and alternating stress, and then cracks will be formed inside the concrete. The formation of penetrating cracks inside the concrete will form a channel for liquid water, causing many corrosive substances to enter the interior of the concrete with the liquid water, causing corrosion to the concrete and internal steel bars, and significantly reducing the durability of the concrete. [0003] The commonly used methods include pre-embedded microcapsule-coated strong alkali, microcapsule-coated polymer resin and microcapsule-coated bacteria etc. to add to concrete. When cracks are created, the active ingredients are released through the rupture of the microcapsules. When the pre-embedded microcapsules containing strong alkali substances, the active ingredients can pr...

Claims

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Application Information

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IPC IPC(8): C04B24/24
Inventor 陈嘉林岑志伟徐伟
Owner 上海惠邦特种涂料有限公司
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