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Recycled concrete, recycled concrete prefabricated part and preparation method thereof

A technology of recycled concrete and prefabricated components, applied in the field of concrete, can solve the problems of reduced fluidity and workability of concrete, increased water absorption of recycled aggregates, and large loss of concrete slump, so as to improve the loss of large slump and reduce Water absorption and the effect of improving mechanical properties

Pending Publication Date: 2021-09-07
苏州建国建筑工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the accumulation of damage in the waste concrete during the crushing process, a large number of microcracks are caused inside the concrete, which will lead to an increase in the porosity of the recycled aggregate, which in turn leads to an increase in the water absorption of the recycled aggregate.
However, the increase of water absorption of recycled aggregate will lead to the reduction of concrete fluidity and workability, which will cause a large loss of concrete slump and difficult vibration operation, which is not conducive to the forming of concrete.

Method used

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  • Recycled concrete, recycled concrete prefabricated part and preparation method thereof
  • Recycled concrete, recycled concrete prefabricated part and preparation method thereof
  • Recycled concrete, recycled concrete prefabricated part and preparation method thereof

Examples

Experimental program
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Effect test

preparation example 1

[0041] This preparation example prepared a modified recycled aggregate, the specific method is as follows:

[0042] Pre-treatment: Clean the recycled aggregate, and then dry it naturally until the surface is dry.

[0043] Soaking: Soak the dried recycled aggregate in a sodium carbonate solution with a temperature of 25°C and a concentration of 35wt% for 24 hours.

[0044] Drying: Take the soaked recycled aggregate out of the sodium carbonate solution and dry it under natural conditions to obtain modified recycled aggregate.

preparation example 2-7

[0046] As shown in Table 1, Preparation Examples 2-7 are basically the same as Preparation Example 1, the main difference is that in the soaking step, the concentration of the sodium carbonate solution used and the soaking time of the recycled aggregate in the sodium carbonate solution are different.

[0047] The control parameter of soaking step in table 1 preparation example 1-7

[0048] project Sodium carbonate concentration / wt% Soaking time / h Preparation Example 1 35 24 Preparation example 2 25 24 Preparation example 3 15 24 Preparation Example 4 5 24 Preparation Example 5 15 36 Preparation Example 6 15 48 Example 7 15 60

preparation example 8

[0050] This preparation example is basically the same as preparation example 6, the main difference is: in the soaking step, the recycled aggregate is soaked in potassium carbonate solution.

[0051] Specifically:

[0052] Pre-treatment: Clean the recycled aggregate, and then dry it naturally until the surface is dry.

[0053]Soaking: Soak the dried recycled aggregate in a potassium carbonate solution with a temperature of 25°C and a concentration of 15wt% for 48 hours.

[0054] Drying: Take the soaked recycled aggregate out of the potassium carbonate solution and dry it under natural conditions to obtain modified recycled aggregate.

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Abstract

The invention relates to recycled concrete, a recycled concrete prefabricated part and a preparation method thereof. The recycled concrete is prepared from the following raw materials in parts by weight: 325 to 420 parts of cement, 500 to 650 parts of fine aggregate, 850 to 1000 parts of coarse aggregate, 350 to 450 parts of recycled aggregate, 155 to 200 parts of water, 3 to 9 parts of a retarding type water reducing agent and 2 to 6 parts of an early strength agent. The preparation method of the recycled concrete prefabricated part comprises the steps of recycled concrete slurry preparation, concrete pouring, prefabricated part maintenance and the like. The concrete prefabricated part is obtained by adopting the preparation method of the recycled concrete prefabricated part. The flowing property of the concrete containing the recycled aggregate is improved, and the problems that the slump loss of the recycled concrete is large and the vibrating operation is difficult are solved; meanwhile, the early strength and the later strength of the concrete are also improved, the problem that demolding is difficult to realize in one day after the delayed coagulation component is added is solved, and the production cycle and the product quality of the concrete member are ensured.

Description

technical field [0001] The application relates to the field of concrete, and more specifically, it relates to a recycled concrete, a recycled concrete prefabricated component and a preparation method thereof. Background technique [0002] With the development of urbanization, a large amount of construction waste is discharged every year in our country. These construction wastes are often piled in the open air or simply landfilled without treatment, which has brought enormous pressure to environmental protection. At the same time, there are still many reusable components in these construction wastes, which will cause waste of resources if discarded arbitrarily. Therefore, how to recycle these waste concrete is an important issue. [0003] Recycled aggregate refers to the aggregate obtained by crushing and screening waste concrete. The use of recycled aggregates can not only reduce the environmental pressure caused by the discharge of construction waste, but also make full ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B20/10
CPCC04B28/04C04B20/107C04B2201/50C04B14/06C04B14/02C04B18/16C04B2103/302C04B2103/14C04B2103/22
Inventor 李强解华继沈峰
Owner 苏州建国建筑工业有限公司
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