Pretreatment strengthening method of recycled aggregate and preparation method of recycled concrete

A technology of recycled concrete and recycled aggregate is applied in the preparation of recycled concrete and the field of pretreatment and strengthening of recycled aggregate. , the effect of reducing water absorption

Active Publication Date: 2022-01-25
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for pretreatment and strengthening of recycled aggregate and a method for preparing recycled concrete, which are used to solve the problems of cumbersome preparation methods for existing recycled aggregate and recycled concrete, high processing costs, and poor product performance. question

Method used

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  • Pretreatment strengthening method of recycled aggregate and preparation method of recycled concrete
  • Pretreatment strengthening method of recycled aggregate and preparation method of recycled concrete
  • Pretreatment strengthening method of recycled aggregate and preparation method of recycled concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0048] A pretreatment strengthening method for recycled aggregates, comprising the following steps:

[0049] 1) Classifying, crushing, sorting and screening waste concrete to obtain 50 kg of recycled aggregate with a particle size of (5-25) mm;

[0050] 2) Rinse the recycled aggregate with low-pressure water for 6 minutes, collect the washing liquid, and dry the rinsed recycled aggregate naturally at 18°C ​​to obtain dry recycled aggregate;

[0051] 3) Ca(OH) 2 Add it into water and stir evenly, then add polyvinyl alcohol solution and stir to get Ca(OH) 2 An aggregate strengthening solution with a mass content of 10% and a polyvinyl alcohol content of 8%;

[0052] 4) Immerse 4kg of dry recycled aggregate in 40kg of aggregate strengthening solution for 12 hours, take it out and then dry it naturally at 18°C, and obtain strengthened recycled aggregate with a particle size of (5-25)mm after sieving.

Embodiment 2

[0054] The Ca(OH) of the aggregate strengthening solution used in this example 2 The mass content is 8%, the polyvinyl alcohol mass content is 8%, soaked for 6 hours, and then dried naturally at 25°C after taking it out, and the rest is the same as that of Example 1.

Embodiment 3

[0056] The Ca(OH) of the aggregate strengthening solution used in this example 2 The mass content is 12%, the polyvinyl alcohol mass content is 6%, soaked for 8 hours, and then dried naturally at 20°C after taking it out, and the rest is the same as in Example 1.

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Abstract

The invention relates to a pretreatment strengthening method of recycled aggregate and a preparation method of recycled concrete. The pretreatment strengthening method comprises the following steps: firstly, washing the recycled aggregate with low-pressure water, naturally airing the material, soaking in an aggregate strengthening solution for 6-12 h, taking out the material, and naturally airing the material to obtain the strengthened recycled aggregate; the preparation method of the recycled concrete comprises the following steps: sequentially standing, precipitating and filtering a washing solution obtained after washing to obtain a regenerated solution; and stirring the regenerated liquid, cement, EVA rubber powder, a polycarboxylate superplasticizer and reinforced regenerated aggregate to obtain the regenerated concrete. Compared with the prior art, the strength of the recycled aggregate can be improved, the performance of the prepared recycled aggregate concrete can be effectively improved, and the application range of the recycled aggregate can be expanded.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a pretreatment strengthening method of recycled aggregate and a preparation method of recycled concrete. Background technique [0002] The process of industrialization around the world continues to accelerate, and resource consumption and environmental damage are also becoming more and more serious. Concrete is the most widely used building material. The amount of concrete used in the world is increasing every year. The resulting resources, energy, environment and related social problems are very prominent. More and more old concrete buildings no longer meet the requirements of today's buildings. , these buildings urgently need to be remodeled or demolished, followed by the disposal of a large amount of construction waste. The technology of recycling a large amount of waste concrete by preparing recycled aggregate concrete (that is, recycled concrete) is generally consi...

Claims

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Application Information

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IPC IPC(8): C04B20/10C04B20/02C04B18/16C04B28/04
CPCC04B20/1033C04B18/167C04B20/02C04B28/04C04B2201/20C04B2201/50C04B24/26C04B2103/302Y02W30/91
Inventor 孙振平刘恒葛好升
Owner TONGJI UNIV
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