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Slow-release retarder for shrinkage-compensating concrete, preparation method and application thereof

A technology for compensating shrinkage and concrete, applied in the field of concrete admixtures, can solve problems such as troublesome joint filling construction, leaving hidden dangers, etc., to achieve the effect of improving the compensation effect, improving the limiting expansion rate, and meeting the construction requirements

Active Publication Date: 2017-03-01
武汉三源特种建材有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to prevent and alleviate the temperature shrinkage cracks of super-long concrete structures, it is a routine measure to effectively install the post-cast belt, but the post-cast belt prolongs the construction period, and the lapping, welding and cleaning of the broken steel bars all bring certain troubles to the joint filling construction. good will leave a hidden danger

Method used

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  • Slow-release retarder for shrinkage-compensating concrete, preparation method and application thereof
  • Slow-release retarder for shrinkage-compensating concrete, preparation method and application thereof
  • Slow-release retarder for shrinkage-compensating concrete, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Calculate the following substances by mass:

[0034] Sodium Gluconate 5%;

[0035] Gum Arabic 95%;

[0036] Put it into a beaker, add water, dissolve at room temperature or properly (heating cannot make it boil), and keep stirring to accelerate the dissolution until there are no particles in the solution, then pour the solution into a suitable container, put the water in an oven at 90°C Completely evaporate to dryness, and grind through 80μm square hole sieve to prepare slow-release retarder.

Embodiment 2

[0038] Calculate the following substances by mass:

[0039] Sodium Gluconate 15%;

[0040] Gum Arabic 85%;

[0041] Put it into a beaker, add water, dissolve at room temperature or properly (heating cannot make it boil), and keep stirring to accelerate the dissolution until there are no particles in the solution, then pour the solution into a suitable container, put the water in an oven at 90°C Completely evaporate to dryness, and grind through 80μm square hole sieve to prepare slow-release retarder.

Embodiment 3

[0043] Calculate the following substances by mass:

[0044] Sodium Gluconate 9%;

[0045] Gum Arabic 91%;

[0046] Put it into a beaker, add water, dissolve at room temperature or properly (heating cannot make it boil), and keep stirring to accelerate the dissolution until there are no particles in the solution, then pour the solution into a suitable container, put the water in an oven at 90°C Completely evaporate to dryness, and grind through 80μm square hole sieve to prepare slow-release retarder.

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PUM

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Abstract

The invention relates to a slow release retarder for compensating shrinkage concrete. The slow release retarder is prepared from 5-15mass% of a setting retarding component and 85-95mass% of a slow release component, wherein the setting retarding component comprises at least one hydrophilic macromolecule containing a hydroxy group or a hydroxycarboxyl group, selected from one or more of structures shown in the specification, and the slow release component is selected from Arabic gum, gelatin, shellac, methyl cellulose, ethyl cellulose, carboxymethyl cellulose, polyethylene glycol and polyvinyl alcohol. The invention also provides a preparation method and an application of the slow release retarder for compensating shrinkage concrete. Compared with retarders in the prior art, the slow release retarder has the advantages of effective adjustment of compensation of the strength development of the shrinkage concrete, improvement of the restrained expansion rate, no influences on the compensation of the fluidity or the slump of the shrinkage concrete or the setting time of concrete, and construction requirement meeting.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a slow-release retarder for shrinkage-compensating concrete, a preparation method and application thereof. Background technique [0002] After the concrete is poured, due to the large amount of heat of hydration generated by the hydration of the cement, the temperature of the concrete rises, resulting in volumetric thermal expansion. After reaching the maximum temperature, as the heat dissipates to the external environment, the temperature will drop from the maximum value to a stable or quasi-stable value, and temperature shrinkage stress will be generated. When the shrinkage stress exceeds the ultimate tensile strength of concrete, it will lead to concrete cracking . In the construction of water conservancy and hydropower projects, the temperature shrinkage crack of mass concrete is one of the key factors affecting the quality and durability of the proje...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38C04B24/02C04B24/06C04B103/22
Inventor 吴翠娥刘虎张晓果刘燕刘辉
Owner 武汉三源特种建材有限责任公司
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