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Recycled aggregate concrete and preparation method thereof

A technology of recycled aggregate and recycled coarse aggregate, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc. Low strength and other problems, to achieve the effect of reducing water absorption, improving compressive strength and impermeability, and improving connectivity

Active Publication Date: 2021-06-25
杭州申华混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Regarding the above-mentioned related technologies, the inventor believes that the above-mentioned related technologies have the following defects: the strength of the recycled coarse aggregate is low, the crushing value is large, and the bonding force between the old and new mortar is weak, resulting in relatively low compressive strength of the concrete. Low

Method used

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  • Recycled aggregate concrete and preparation method thereof
  • Recycled aggregate concrete and preparation method thereof
  • Recycled aggregate concrete and preparation method thereof

Examples

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Effect test

preparation example 1

[0044] Modified recycled coarse aggregate is prepared through the following steps:

[0045] Pretreatment, the waste concrete is crushed into coarse particles with a particle size of 5-20mm, and after being ball milled by a ball mill, 300kg of pretreated concrete particles are obtained;

[0046] Modification treatment, the pretreated concrete particles are put into the oxalic acid solution with a mass concentration of 70g / L, the oxalic acid solution is completely immersed in the pretreated concrete particles, stirred evenly, soaked for 1 hour, and the mixture is obtained;

[0047] Coupling treatment, add 30kg basalt fiber to the mixture, the length of basalt fiber is 2mm, the diameter is 10μm, stir evenly, then add 3kg silane coupling agent, silane coupling agent is vinyl tributyl ketoxime base silane, stirring reaction After 30 minutes, filter and dry to obtain modified recycled coarse aggregate.

preparation example 2

[0049] Modified recycled coarse aggregate is prepared through the following steps:

[0050] Pretreatment, crushing waste concrete into coarse particles with a particle size of 5-20mm, and after ball milling, 280kg of pretreated concrete particles are obtained;

[0051] Modification treatment, the pretreated concrete particles are put into the oxalic acid solution with a mass concentration of 65g / L, the oxalic acid solution is completely immersed in the pretreated concrete particles, stirred evenly, soaked for 1 hour, and the mixture is obtained;

[0052] Coupling treatment, add 35kg basalt fiber to the mixture, the length of basalt fiber is 2mm, the diameter is 10μm, stir evenly, then add 4kg silane coupling agent, silane coupling agent is aminopropyltriethoxysilane, stir reaction After 30 minutes, filter and dry to obtain modified recycled coarse aggregate.

preparation example 3

[0054] Modified recycled coarse aggregate is prepared through the following steps:

[0055] Pretreatment, the waste concrete is broken into coarse particles with a particle size of 5-20mm, and after being ball milled by a ball mill, 260kg of pretreated concrete particles are obtained;

[0056] Modification treatment, the pretreated concrete particles are put into the oxalic acid solution with a mass concentration of 60g / L, the oxalic acid solution is completely immersed in the pretreated concrete particles, stirred evenly, soaked for 1 hour, and the mixture is obtained;

[0057] Coupling treatment, add 40kg basalt fiber to the mixture, the length of basalt fiber is 2mm, the diameter is 10μm, stir evenly, then add 5kg silane coupling agent, silane coupling agent is aminopropyltriethoxysilane, stirring reaction After 30 minutes, filter and dry to obtain modified recycled coarse aggregate.

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Abstract

The invention relates to the technical field of concrete, and particularly discloses recycled aggregate concrete and a preparation method thereof. The recycled aggregate concrete is prepared from the following raw materials in parts by weight: 360-380 parts of cement, 690 to 700 parts of andesite sand, 650 to 680 parts of vanadium iron slag, 260 to 300 parts of modified recycled coarse aggregate, 25 to 35 parts of zeolite powder, 20-30 parts of volcanic ash, 10-15 parts of carbide slag powder, 10 to 12 parts of a polycarboxylic acid water reducing agent, and 180 to 200 parts of water. The preparation method of the modified recycled coarse aggregate comprises the following steps: pretreatment, modification treatment and coupling treatment. The advantage of improving the compressive strength and the impermeability of the concrete is achieved.

Description

technical field [0001] The application relates to the technical field of recycled concrete, more specifically, it relates to a recycled aggregate 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 kind of recycled concrete produced by using recycled aggregate is disclosed in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B20/02
CPCC04B28/00C04B20/026C04B2201/50C04B14/06C04B18/144C04B18/16C04B14/047C04B18/0481C04B2103/302C04B14/4643C04B20/023Y02W30/91
Inventor 裴恩郭耀鹏
Owner 杭州申华混凝土有限公司
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