High-strength recycled concrete and preparation method thereof

A recycled concrete, high-strength technology, applied in the field of building materials, can solve the problems of high water absorption, low compressive strength, and increased water consumption of recycled coarse aggregates, and achieves reduced porosity, improved wear resistance and compressive strength. , the effect of reducing porosity

Active Publication Date: 2019-03-12
曙光装配式建筑科技(浙江)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Compared with the natural aggregate, the recycled coarse aggregate in the above-mentioned patents: the surface of the recycled coarse aggregate is covered with hardened cement slurry, so the bonding between the recycled coarse aggregate and the old and new mortar is relatively weak, and the recycled coarse aggregate absorbs water. T

Method used

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  • High-strength recycled concrete and preparation method thereof
  • High-strength recycled concrete and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Embodiment 1: a kind of high-strength recycled concrete, its raw material comprises the component of following parts by weight:

[0052] Ordinary Portland cement 75 parts;

[0053] 60 parts of natural fine aggregate;

[0054] 90 parts of modified recycled coarse aggregate;

[0055] 8 parts of fly ash;

[0056]10 parts of microsilica fume;

[0057] 1 part of polycarboxylate superplasticizer;

[0058] Sodium gluconate 8 parts;

[0059] 5 parts of carbon nanofiber;

[0060] 8 parts of stainless steel fiber;

[0061] 35 parts of water;

[0062] The preparation method of modified recycled coarse aggregate is as follows:

[0063] (1) breaking the discarded concrete into aggregates of 5-40mm, then washing the broken aggregates with water, and drying them naturally to obtain dry aggregates, the moisture content of which is 2.5%;

[0064] (2) Mix penetrant, nano-titanium dioxide and water uniformly to form a modified liquid. The parts by weight of penetrant, nano-titani...

Embodiment 2

[0071] Embodiment 2: A kind of high-strength recycled concrete. The difference from Embodiment 1 is that the parts by weight of silica fume are 8 parts by weight, and the parts by weight of stainless steel fibers are 9 parts.

Embodiment 3

[0072] Embodiment 3: A high-strength recycled concrete. The difference from Embodiment 1 is that the weight parts of silica fume are 6 parts, and the weight parts of stainless steel fibers are 10 parts.

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Abstract

The invention discloses a high-strength recycled concrete and a preparation method thereof, and relates to the field of building materials. The high-strength recycled concrete is prepared from the following components in parts by weight: 75 to 85 parts of ordinary Portland cement, 50 to 60 parts of natural fine aggregate, 90 to 100 parts of modified recycled coarse aggregate, 8 to 10 parts of flyash, 6 to 10 parts of micro-silicon powder, 1 to 2 parts of polycarboxylate water reduction agent, 8 to 12 parts of sodium gluconate, 5 to 6 parts of nanometer carbon fiber, 8 to 10 parts of stainlesssteel fiber, and 35 to 45 parts of water. The high-strength recycled concrete has the advantages that the compressive strength is high, and the anti-seepage property is good.

Description

technical field [0001] The invention relates to the technical field of building materials, more specifically, it relates to a high-strength recycled concrete and a preparation method thereof. Background technique [0002] Recycled concrete means that waste concrete blocks are crushed, cleaned and graded, mixed with gradation in a certain proportion, partially or completely replaced by natural aggregates (mainly coarse aggregates) such as sand and gravel, and then added with cement, water, etc. new concrete. Recycled concrete can have the following situations according to the combination of aggregates: all aggregates are recycled aggregates; coarse aggregates are recycled aggregates, fine aggregates are natural sand; coarse aggregates are natural gravel or pebbles, fine aggregates The raw materials are recycled aggregates; recycled aggregates replace part of the coarse or fine aggregates. [0003] A Chinese invention patent with publication number CN107010896A discloses a r...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B20/10
CPCC04B20/1066C04B28/04C04B2111/00293C04B2201/50C04B18/16C04B18/08C04B18/146C04B2103/302C04B24/10C04B14/386C04B14/48C04B14/00C04B20/1037
Inventor 林仁辉徐铖易
Owner 曙光装配式建筑科技(浙江)有限公司
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