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Multi-component composite reinforced anti-cracking agent for concrete and preparation method of multi-component composite reinforced anti-cracking agent

A technology of strengthening anti-cracking agent and multi-component compounding, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc. Obvious problems, to achieve the effect of improving long-term mechanical properties, reducing too fast reaction rate, and long duration of expansion

Active Publication Date: 2022-05-13
西安建祥建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of composite expansion agent uses the generated ettringite to provide early expansion, and the MgO in the magnesium slag provides later expansion. However, due to the low reactivity of magnesium slag, the later expansion is not obvious, and the compensation effect on temperature drop and shrinkage is not ideal.

Method used

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  • Multi-component composite reinforced anti-cracking agent for concrete and preparation method of multi-component composite reinforced anti-cracking agent
  • Multi-component composite reinforced anti-cracking agent for concrete and preparation method of multi-component composite reinforced anti-cracking agent
  • Multi-component composite reinforced anti-cracking agent for concrete and preparation method of multi-component composite reinforced anti-cracking agent

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Crushing and grinding the dolomite, drying the original phosphogypsum and phosphorus slag through a drum dryer until the free water content is less than 3%; weigh 55 parts of dolomite, 2 parts of phosphogypsum, and 2 parts of phosphorus slag in parts by weight. 1 part, 14 parts of fly ash, 25 parts of limestone, 1 part of strontium oxide, and 1 part of sodium tungsten, mix them evenly to get raw meal; place the raw meal in a rotary kiln for calcination at 1250°C for 60 minutes, and then quench the temperature with a grate cooler , lowered to below 400°C within 30 minutes, and finally ground by a ball mill to 80 μm sieve ≤ 10%, that is, the finished multi-component composite reinforced anti-cracking agent for concrete is obtained.

Embodiment 2

[0034] Crushing and grinding the dolomite, drying the original phosphogypsum and phosphorus slag through a drum dryer until the free water content is less than 3%; weigh 73 parts of dolomite, 3 parts of phosphogypsum, and 1 12 parts of fly ash, 10 parts of limestone, 1 part of molybdenum oxide, and 1 part of calcium fluoride, and mix them evenly to obtain raw meal; place the raw meal in a rotary kiln for calcination at 1300°C for 60 minutes, and then cool it rapidly with a grate cooler , lowered to below 400°C within 30 minutes, and finally ground by a ball mill to 80 μm sieve ≤ 10%, that is, the finished multi-component composite reinforced anti-cracking agent for concrete is obtained.

Embodiment 3

[0036]Crushing and grinding the dolomite, drying the original phosphogypsum and phosphorus slag through a drum dryer until the free water content is less than 3%; weigh 80 parts of dolomite, 3 parts of phosphogypsum, and 1 1 part, 11 parts of fly ash, 3 parts of limestone, 1 part of molybdenum oxide, 0.5 part of sodium tungstate, and 0.5 part of zinc oxide, and mix them evenly to obtain raw meal; place the raw meal in a rotary kiln for 90 minutes at 1300 °C, and then The grate cooler is used for rapid cooling, and the temperature is lowered to below 400°C within 30 minutes. Finally, it is ground by a ball mill until the sieve residue of 80 μm is ≤10%, and the multi-component composite reinforced anti-cracking agent for concrete is obtained.

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Abstract

The invention discloses a multi-component composite reinforced anti-cracking agent for improving the anti-cracking performance of concrete and a preparation method of the multi-component composite reinforced anti-cracking agent. The anti-cracking agent is prepared from the following raw materials in parts by weight: 55-80 parts of dolomite, 1-5 parts of phosphogypsum, 0-5 parts of phosphorus slag, 10-15 parts of fly ash, 0-25 parts of limestone, 0.5-1 part of a hydration slow-release agent and 0.5-1.5 parts of a mineralizing agent. The preparation method comprises the following steps: uniformly mixing the raw materials, calcining at 1150-1300 DEG C for 60-90 minutes, quenching and cooling to below 400 DEG C, and grinding until the 80 mu m screen residue is less than or equal to 10%, thereby obtaining the multi-component composite reinforced anti-cracking agent finished product. The use amount of the anti-cracking agent in the concrete is 5-8% of the use amount of the cementing material. The multi-component composite reinforced anti-cracking agent disclosed by the invention has the advantages of low hydration heat release, long expansion lasting time, high concrete later strength and the like, and can be widely applied to concrete structures with high cracking risks, such as mass concrete, thin-wall structures, super-long structures and the like.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures for building materials, and in particular relates to a multi-component composite reinforced anti-cracking agent for concrete and a preparation method thereof. Background technique [0002] Cracking is a technical problem usually faced in modern concrete structures. The occurrence of cracks will not only affect the structural safety of building structures, but also reduce the long-term durability. In actual concrete structures, drying shrinkage and temperature drop shrinkage are the most important factors causing structural cracking. Incorporating expansion anti-cracking agents into concrete mixtures is one of the technical means to effectively reduce the risk of cracking. Currently, the commonly used concrete expansion agents include calcium oxide expansion agents, ettringite expansion agents and magnesium oxide expansion agents, calcium oxide The expansive agent has a fast expansion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14
CPCC04B40/0039C04B14/26C04B14/28C04B18/08C04B18/145C04B22/144C04B22/06C04B22/00C04B22/126Y02W30/91
Inventor 李开荣刘庆亮马青山
Owner 西安建祥建材科技有限公司
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