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Recycled aggregate surface strengthening modifier and modification method thereof

A technology of surface strengthening and recycled aggregates, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve problems such as difficult operation, complicated technology, and long time consumption, and achieve convenient promotion and application with low technical difficulty , the effect of simple operation

Active Publication Date: 2020-10-16
CCCC SECOND HARBOR ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Most of the single chemical solution infiltration strengthening, physical pre-absorption filling strengthening, and slurry filling strengthening modification measures, the soaking process is cumbersome, time-consuming, and difficult to operate, which may affect the apparent density, water absorption, and crushing of recycled aggregates. Indices such as value have a great improvement effect, but its improvement on the overall performance of recycled aggregate concrete is limited; strengthening measures such as heating first and then grinding and shaping, and medium microwave heating and mechanical grinding and shaping strengthen energy consumption; graphene filling strengthening, nano Measures such as silica slurry filling enhancement, ultrasonic cleaning enhancement, microbial strain mineralization deposition enhancement, and high-concentration carbon dioxide enhancement are complex and costly and difficult to popularize and apply

Method used

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  • Recycled aggregate surface strengthening modifier and modification method thereof
  • Recycled aggregate surface strengthening modifier and modification method thereof
  • Recycled aggregate surface strengthening modifier and modification method thereof

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Embodiment 1

[0043] A surface strengthening modifier for recycled aggregate provided by the present invention includes the following components in parts by mass: 15 parts of microsilica powder, 1.8 parts of instant sodium silicate powder, 23 parts of lightly burned magnesium oxide, superfine 11 parts of calcium aluminate powder, 57 parts of superfine fly ash, 38 parts of superfine slag powder, 1.0 part of superfine sepiolite powder, and 0.8 part of polycarboxylate superplasticizer.

[0044] The above raw material components are commercially available products:

[0045] Silica fume is silica fume for concrete produced by Sichuan Langtian Resources Comprehensive Utilization Co., Ltd., amorphous SiO 2 The content is 93.25%, the average particle size is 0.3μm, and the density is 2200kg / m 3 , specific surface area 20000m 2 / kg;

[0046] Light-burned magnesia is produced by Wuhan Sanyuan Special Building Materials Co., Ltd. Its MgO content is 88.3%, 45μm sieve is 3%, and its specific surface ...

Embodiment 2

[0057] A surface strengthening modifier for recycled aggregates provided by the present invention includes the following components in parts by mass: 30 parts of microsilica powder, 5.3 parts of instant sodium silicate powder, 30 parts of light-burned magnesium oxide, superfine Calcium aluminate powder 16 parts, superfine fly ash 95 parts, superfine slag powder 76 parts, superfine sepiolite powder 2.0 parts, polycarboxylate superplasticizer 1.2 parts.

[0058] The above raw material components are commercially available products:

[0059] Silica fume is silica fume for concrete produced by Sichuan Langtian Resources Comprehensive Utilization Co., Ltd., amorphous SiO 2 The content is 93.85%, the average particle size is 0.35μm, and the density is 2250kg / m 3 , specific surface area 15000m 2 / kg;

[0060] Light-burned magnesia is produced by Wuhan Sanyuan Special Building Materials Co., Ltd., and its MgO 2 The content is 85.8%, the 45μm sieve is 3.5%, and the specific surface...

Embodiment 3

[0071] A surface strengthening modifier for recycled aggregate provided by the present invention includes the following components in parts by mass: 19 parts of microsilica powder, 2.8 parts of instant sodium silicate powder, 26 parts of light-burned magnesium oxide, superfine 13 parts of calcium aluminate powder, 76 parts of superfine fly ash, 57 parts of superfine slag powder, 1.5 parts of superfine sepiolite powder, and 1.0 part of polycarboxylate superplasticizer.

[0072] The above raw material components are commercially available products:

[0073] Silica fume is silica fume for concrete produced by Sichuan Langtian Resources Comprehensive Utilization Co., Ltd., amorphous SiO 2 The content is 94.15%, the average particle size is 0.25μm, and the density is 2150kg / m 3 , specific surface area 25000m 2 / kg;

[0074] Light-burned magnesia is produced by Wuhan Sanyuan Special Building Materials Co., Ltd., and its MgO 2 The content is 89.1%, the 45μm sieve is 5%, and the s...

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Abstract

The invention discloses a recycled aggregate surface strengthening modifier and a modification method thereof. The recycled aggregate surface strengthening modifier is prepared from the following components in parts by mass: 15-30 parts of silica fume, 23-30 parts of light calcined magnesia, 11-16 parts of superfine calcium aluminate powder, 1.8-5.3 parts of instant sodium silicate powder, 57-95 parts of superfine coal ash, 38-76 parts of superfine slag powder, 1-2 parts of superfine sepiolite powder and 0.8-1.2 parts of polycarboxylate superplasticizer. The recycled aggregate surface strengthening modifier disclosed by the invention is used for carrying out in-situ strengthening on the recycled aggregate, so that a large amount of time for soaking, draining, re-air-drying or drying is saved, the surface strengthening modification effect of the recycled aggregate is greatly improved, and the performance of concrete prepared from the recycled aggregate is obviously improved.

Description

technical field [0001] The invention relates to building materials, in particular to a regenerated aggregate surface strengthening modifier and a modification method thereof. Background technique [0002] Aggregate made from waste concrete in construction waste after crushing and screening is called recycled aggregate. Because a certain amount of old cement mortar adheres to the surface of the recycled aggregate after direct crushing or simple grinding and shaping, the old cement mortar causes the water absorption and crushing value of the recycled aggregate to increase, and the apparent density and firmness decrease. In the concrete prepared with recycled aggregate, the interface between the old cement mortar and the freshly mixed concrete cement mortar often becomes the weak point in the concrete microstructure, so that the performance of recycled aggregate concrete is significantly lower than that of natural aggregate concrete. [0003] At present, the modification measu...

Claims

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Application Information

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IPC IPC(8): C04B24/32C04B20/02C04B18/16
CPCC04B40/0039C04B20/023C04B18/167C04B14/062C04B14/042C04B12/04C04B18/08C04B18/141C04B22/066C04B22/08C04B24/32Y02W30/91
Inventor 余以明谭啸峰李浩段振益杜凯旋阮胜祥李毅姜俊徐海江罗赞荣谢磊黎先访
Owner CCCC SECOND HARBOR ENG
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