Self-repairing functional additive for concrete and preparation method of functional additive

A self-healing, concrete technology, applied in the field of building materials, can solve the problems of prolonged concrete setting time, large molecular size, and cracks cannot self-repair, etc., to achieve the effect of improving self-repairing ability, strong self-repairing ability and good self-repairing effect

Active Publication Date: 2018-03-27
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But existing concrete self-repairing function admixture all exists: (1) the sodium citrate that uses, sodium gluconate have very strong inhibitory action to the hydration of cement, belong to typical cement concrete retarder, a small amount of adding will greatly Prolong the setting time of concrete; (2) The chelated products formed by the reaction of sodium citrate, sodium gluconate, etc. (3) There are less free calcium ions and silicate ions in concrete, and the amount of chelated calcium ions such as sodium citrate and sodium gluconate is small, and the ability to carry calcium ions to cracks is weak. Wide cracks cannot be se

Method used

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  • Self-repairing functional additive for concrete and preparation method of functional additive
  • Self-repairing functional additive for concrete and preparation method of functional additive
  • Self-repairing functional additive for concrete and preparation method of functional additive

Examples

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Example Embodiment

[0024] Example 1

[0025] A concrete self-repairing functional admixture, prepared by the following method: weigh 53 parts of multi-element complexing agent, 45 parts of calcium bicarbonate, 2 parts of acrylic acid-acrylamide copolymer water-absorbent resin, add them to the mixer and stir for 5 minutes to obtain Concrete self-repairing additive.

Example Embodiment

[0026] Example 2

[0027] A concrete self-repairing functional admixture, prepared by the following method: weigh 53 parts of multiple ion complexing agent, 43 parts of calcium bicarbonate, 4 parts of acrylic acid-acrylamide copolymer water-absorbent resin, add them to the mixer and mechanically stir for 5 minutes to obtain Concrete self-repairing additive.

[0028] Weigh cement, crushed stone, mineral powder, sand, water, water reducing agent and the concrete self-repairing additive prepared in Example 1 or Example 2 according to the mass ratio in Table 1. First add gravel, sand, mineral powder, cement and self-healing additives into a concrete mixer and mix for 30s, then add the water reducing agent and water to the mixer and mix for 120s to obtain concrete with self-repairing cracks; The concrete self-repairing function admixture is not added, and other conditions are the same.

[0029] Freeze-thaw damage self-repair and crack self-repair tests were performed on the self-healing...

Example Embodiment

[0036] Example 3

[0037] A concrete self-repairing functional admixture, prepared by the following method: weigh 53 parts of multi-element complexing agent, 45 parts of calcium bicarbonate, 3 parts of acrylic acid-acrylamide copolymer water-absorbent resin, and add them to the mixer and mechanically stir for 5 minutes to obtain Concrete self-repairing additive.

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Abstract

The invention belongs to the field of building materials and particularly relates to a self-repairing functional additive for concrete and a preparation method of the functional additive. The functional additive is prepared by mixing the following raw materials in parts by weight: 40-60 parts of a polybasic ion complexing agent, 40-50 parts of calcium hydrogen phosohate and 1-5 parts of water-absorbent resin. The functional additive has the advantages of strong self-repairing capacity, good self-repairing effect on wide fissures, high repairing speed and the like, does not has a delayed coagulation effect, is relatively strong in practicability and has relatively strong application and promotion values in the self-repairing field of concrete.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a concrete self-repairing functional admixture and a preparation method thereof. Background technique [0002] As an important basic building material, cement concrete has been widely used in housing construction, road construction, subway tunnels, bridges, reservoir dams, hydropower stations, docks and other fields. However, concrete is a porous and brittle material, which is prone to internal damage and cracks due to external environmental factors. Damage and cracks will reduce the strength of concrete, aggravate the chemical erosion of concrete, freeze-thaw damage, corrosion of steel bars and alkali-aggregate reaction, and seriously reduce the durability of concrete structures. [0003] In order to improve the durability of concrete structures, more and more attention has been paid to the self-healing technology of concrete damage and cracks. Existing concrete s...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F122/06C04B22/10C04B28/04
CPCC04B22/106C04B28/04C04B40/0039C08F122/06C04B24/2664C04B24/2652C04B14/02C04B18/141C04B14/06C04B22/002C04B24/24C04B18/08
Inventor 余剑英查亚刚王瑞阳何鹏李颖谢君吴少鹏
Owner WUHAN UNIV OF TECH
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