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Surface treating agent of recycled aggregate and preparation method thereof

A technology of surface treatment agent and recycled aggregate, which is applied in the field of building materials, can solve the problems that the water absorption performance of aggregate cannot be significantly reduced, the reinforcement effect of aggregate is not obvious, and the water absorption of aggregate is reduced, so as to achieve excellent water resistance and increase cementation Performance, the effect of reducing water absorption

Inactive Publication Date: 2012-09-19
JIANGSU MINGHE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanical activation treatment method not only consumes a lot of energy, but also produces a large amount of difficult-to-handle powder; the polymer slurry has good film-forming properties, which can significantly reduce the water absorption of the aggregate, but the reinforcement effect on the aggregate is not obvious, and the cement slurry strengthens The effect is obvious, but the water absorption performance of the aggregate cannot be significantly reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: A recycled aggregate surface treatment agent is mainly made of the following raw materials in weight percentage: 1% polyvinyl alcohol, 5% sodium silicate, 1% urea, 0.8% sodium fluorosilicate, and 92.2% water.

[0019] Among the above raw materials, polyvinyl alcohol has a degree of polymerization of 17; sodium silicate is industrial grade water glass with a modulus of 3.0; urea is an agricultural product containing N>46%; sodium fluorosilicate is an analytically pure chemical reagent.

[0020] The preparation method of above-mentioned recycled aggregate surface treatment agent is:

[0021] The first step is to weigh according to the ratio of the above-mentioned raw materials, and set aside;

[0022] The second step, dissolving polyvinyl alcohol: first heat the water to 20°C, then slowly add polyvinyl alcohol into the water at 20°C, and keep stirring, continue to stir for 10 minutes after adding polyvinyl alcohol, then raise the temperature to 90-95°C , the h...

Embodiment 2

[0024] Example 2: A recycled aggregate surface treatment agent, mainly made of the following raw materials in weight percentage: 1.5% polyvinyl alcohol, 6% sodium silicate, 2% urea, 1% sodium fluorosilicate, and 89.5% water.

[0025] Among the above raw materials, polyvinyl alcohol has a degree of polymerization of 24; sodium silicate is industrial grade water glass with a modulus of 3.5; urea is an agricultural product containing N>46%; sodium fluorosilicate is an analytically pure chemical reagent .

[0026] The preparation method of above-mentioned recycled aggregate surface treatment agent is:

[0027] The first step is to weigh according to the ratio of the above-mentioned raw materials, and set aside;

[0028] The second step, dissolving polyvinyl alcohol: first heat the water to 20°C, then slowly add polyvinyl alcohol into the water at 20°C, and keep stirring, continue to stir for 15 minutes after adding polyvinyl alcohol, then raise the temperature to 90-95°C , the h...

Embodiment 3

[0030] Example 3: A recycled aggregate surface treatment agent, mainly made of the following raw materials in weight percentage: 1.2% polyvinyl alcohol, 6% sodium silicate, 1.8% urea, 1% sodium fluorosilicate, and 90% water.

[0031] Among the above raw materials, polyvinyl alcohol has a degree of polymerization of 20; sodium silicate is industrial grade water glass with a modulus of 3.2; urea is an industrial product containing N>46%; sodium fluorosilicate is an analytically pure chemical reagent .

[0032] The preparation method of above-mentioned recycled aggregate surface treatment agent is:

[0033] The first step is to weigh according to the ratio of the above-mentioned raw materials, and set aside;

[0034] The second step, dissolving polyvinyl alcohol: first heat the water to 20°C, then slowly add polyvinyl alcohol into the water at 20°C, and keep stirring, continue stirring for 12 minutes after adding polyvinyl alcohol, and then heat up to 90-95°C , the heating time...

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Abstract

The invention discloses a surface treating agent of recycled aggregate. The surface treating agent is mainly prepared by the following raw materials by weight: 0.5-1.5% of polyvinyl alcohol, 4-10% of sodium silicate, 0.5-3% of urea, 0.2-1% of sodium fluosilicate and 88-93.8% of water. The surface treating agent has the advantages of being capable of improving surface state of the recycled aggregate and remarkably reducing water absorption rate of the recycled aggregate by utilizing the polyvinyl alcohol, sodium silicate and sodium fluosilicate which are good in film formation performance, utilizing sodium silicate and sodium fluosilicate solution to fill holes and micro cracks of the recycled aggregate and obviously improving strength of the recycled aggregate accordingly. In addition, when the recycled aggregate is processed and used for preparing concrete, the film-shaped sodium silicate and sodium fluosilicate on the surface of the recycled aggregate and cement are hydrated to be subjected to calcium hydroxide reaction to produce calcium silicate and calcium fluosilicate which are capable of remarkably improving strength of a concrete transition area and improving bounding performance between the aggregate and cement stone.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a preparation method of a recycled coarse aggregate surface treatment agent. Background technique [0002] With the rapid development of the construction industry, the construction waste generated by the construction industry has increased sharply, which has had a great impact on the environment and caused certain harm to the society. Using waste concrete as recycled aggregate after crushing, removing impurities, grading, etc. can not only solve the environmental pollution caused by waste concrete, but also save natural aggregate resources, thereby reducing the mining of natural sand and gravel, and fundamentally solve the problem of The increasing scarcity of natural aggregates and the environmental damage caused by large-scale sand and gravel mining protect the living environment of human beings and meet the requirements of sustainable development. [0003] The surf...

Claims

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Application Information

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IPC IPC(8): C04B18/16
CPCY02W30/91
Inventor 臧军赵长江田长安
Owner JIANGSU MINGHE GRP
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