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Efficient water reducing agent for recycled aggregate concrete as well as preparation method and application thereof

A high-efficiency water-reducing agent and water-reducing agent technology, used in the field of building materials, can solve the problems of high water absorption, poor work performance, increased water consumption, etc., and achieve the effects of low strength, high water reduction, and reduced water absorption.

Inactive Publication Date: 2014-09-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to its high mortar content, the recycled aggregate has low apparent density and high water absorption, which makes it show poor work performance and poor mechanical properties in the actual production of concrete.
The usual production method is to increase water consumption or pre-wet the aggregate, but it cannot fundamentally solve the problem of using recycled aggregate

Method used

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  • Efficient water reducing agent for recycled aggregate concrete as well as preparation method and application thereof
  • Efficient water reducing agent for recycled aggregate concrete as well as preparation method and application thereof
  • Efficient water reducing agent for recycled aggregate concrete as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Weigh the raw materials of each component according to the following proportions: 5% of β-naphthalene sulfonate formaldehyde condensate, 5% of sulfonated melamine formaldehyde resin, 10% of water-soluble sulfonated acetone-formaldehyde polycondensate, lignosulfonic acid Calcium 10%, sodium gluconate: 2%, sodium lauryl sulfate: 0.3%, water glass: 10%, potassium methyl silicate: 0.1%, water 57.6%;

[0039] (2) Mix the raw materials of the above components evenly: the stirring temperature is 40° C., the stirring speed is 120 rpm, and the stirring time is 10 minutes.

Embodiment 2

[0041] (1) Weigh the raw materials of each component according to the following proportions: 30% of β-naphthalenesulfonate formaldehyde condensate, 5% of sulfonated melamine formaldehyde resin, 10% of water-soluble sulfonated acetone-formaldehyde polycondensate, lignosulfonic acid Calcium 10%, sodium gluconate: 0.5%, sodium lauryl sulfate: 0.5%, water glass: 0.1%, potassium methyl silicate: 10%, water 33.9%;

[0042] (2) Mix the raw materials of the above components evenly: the stirring temperature is 20° C., the stirring speed is 1300 rpm, and the stirring time is 5 minutes.

Embodiment 3

[0044] (1) Weigh the raw materials of each component according to the following proportions: 50% of β-naphthalenesulfonate formaldehyde condensate, 20% of sulfonated melamine formaldehyde resin, 0% of water-soluble sulfonated acetone-formaldehyde condensation polymer, lignosulfonic acid Calcium 10%, sodium gluconate: 5%, sodium lauryl sulfate: 1%, water glass: 0.5%, potassium methyl silicate: 0.5%, water 13%;

[0045] (2) Mix the raw materials of the above components evenly: the stirring temperature is 70° C., the stirring speed is 500 rpm, and the stirring time is 20 minutes.

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Abstract

The invention belongs to the technical field of building materials, and relates to a water reducing agent as well as a preparation method and an application thereof. The water reducing agent is prepared from the following components in percentage by weight: 0-50% of a naphthalene-based efficient water reducing agent, 0-50% of a melamine resin-based water reducing agent, 0-50% of aliphatic efficient water reducing agent, 10-50% of lignosulfonate, 0.1-5% of sodium gluconate, 0.1-5% of sodium lauryl sulfate, 0.1-10% of sodium silicate, 0.1-10% of potassium methyl silicate and 10-65% of water. The water reducing agent has the advantages of wide raw material sources, simple production method, high production efficiency and obvious use effect, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a water reducing agent and its preparation method and application. Background technique [0002] In recent years, with the development of urban construction, a large amount of waste concrete has been produced. In addition to the staggering cost of disposal, the huge amount of waste concrete needs to occupy a large amount of open space for storage, pollute the environment, waste cultivated land, and become a major public hazard in the city. The environmental problems caused by this are very prominent. Therefore, how to deal with these construction wastes reasonably has aroused the general concern of government departments and the public. At the same time, with the continuous mining of natural sand and gravel, natural aggregate resources tend to be exhausted, and the energy consumption and cost of transportation for mining are astonishing, and the damage to the ecological...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/42C04B103/30
Inventor 张雄赵明张永娟秦廉
Owner TONGJI UNIV
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