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A kind of preparation method of high workability recycled concrete

A technology of recycled concrete and work performance, which is applied in the field of housing construction materials, can solve the problems of lack of improvement in the workability of recycled concrete, recycled concrete and recycled concrete, and achieve the effects of promoting commercial application, improving construction performance, and reducing losses

Active Publication Date: 2018-02-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a method for preparing recycled concrete with high workability, which is used to solve the problems in the prior art of improving the workability of recycled concrete and reducing the slump of recycled concrete. Loss to improve the construction performance of recycled concrete

Method used

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  • A kind of preparation method of high workability recycled concrete
  • A kind of preparation method of high workability recycled concrete
  • A kind of preparation method of high workability recycled concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] First weigh the cementitious material, and take 15-25% of fly ash, 25-40% of slag powder, and 40-60% of cement respectively in terms of weight percentage, wherein the total amount of fly ash and slag powder is not more than that of the cementitious material 60% of the total usage. Add the cementitious material to the concrete mixer and mix well. The natural yellow sand is then weighed, and its sand rate is adjusted according to the actual slump of recycled concrete less than 10mm, 10-60mm, and greater than 60mm. Then add the natural yellow sand into the concrete mixer, mix it with the cementitious material, and mix well. Then, add the natural coarse aggregate and the recycled coarse aggregate to the concrete mixer at a mass ratio of 1:1, continue stirring with the cementitious material and natural yellow sand, and mix evenly to obtain a dry material. Among them, the particle size of the natural coarse aggregate is not greater than 25mm, and the particle size of the re...

Embodiment 2

[0113] The recycled concrete was prepared according to the method steps in Example 1, wherein, starting from the engineering application, the selected recycled concrete mix ratio was the mix ratio for the production of a mixing station. The strength grade is C30, and the initial slump is 180±10mm. At the same time, no slump retaining agent is added to the recycled concrete, and only saponin is added.

[0114] In order to quantitatively study the effect of saponin content on improving the workability of recycled concrete, the substitution rate For the test groups of 0% and 100%, three dosages of 0.3‰, 0.6‰ and 1.2‰ (the amount of saponin is taken according to the ratio of the mass of the gelling material) were used for the test. The test mix ratio is shown in Table 5.

[0115] The ratio of recycled coarse aggregate to replace natural coarse aggregate will have different effects on the performance of recycled concrete. In order to study the effect of the replacement rate of re...

Embodiment 3

[0120] 1. Workability test results

[0121] The working performance of the recycled concrete prepared with the mix ratio shown in Table 5 in the above-mentioned Example 2 was measured, and the main method was to measure and compare the loss of slump within a certain period of time.

[0122] The hourly slump loss of each test group measured in this example is generally larger than the actual hourly slump loss value of commercial concrete in the project. The reason for the analysis is that the commercial concrete in the project is in a state of constant stirring during transportation, and the concrete used to measure the subsequent slump loss in the test is in a static state because the conditions in the project cannot be simulated. However, this test can still analyze the effect of saponin on the slump loss of recycled concrete by comparing with the blank group.

[0123] This test is to study the change of the workability of recycled concrete over time. The initial slump of th...

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Abstract

The invention provides a method for preparing recycled concrete with high working performance, which includes the following steps: 1) Weighing the cementitious material and fine aggregate, stirring and mixing uniformly, and then adding natural coarse aggregate and recycled coarse aggregate to continue stirring and mixing uniformly , to obtain a dry material; 2) Weigh the air-entraining agent and mixing water, and mix them uniformly to obtain the first mixed liquid; 3) Add the water reducing agent to the first mixed liquid, stir and mix evenly, to obtain the second mixed liquid; 4) The second mixed solution is added to the dry material, and after stirring, the recycled concrete with high working performance can be obtained. The preparation method of a kind of high working performance recycled concrete provided by the present invention provides the appropriate amount of fly ash, mineral powder, saponin and slump-retaining agent, and also proposes a reasonable sand rate and recycled aggregate grade It can improve the workability of recycled concrete, reduce the slump loss of recycled concrete, and make an important contribution to the commercial application of recycled concrete.

Description

technical field [0001] The invention belongs to the technical field of house building materials, and relates to a preparation method of recycled concrete with high working performance. Background technique [0002] Waste concrete contains a large amount of sand and gravel aggregates. If they can be recycled reasonably and used to produce recycled concrete for new buildings, it will not only reduce costs, save natural resources, and alleviate the contradiction between aggregate supply and demand; The pollution of waste concrete to the environment is an important part of the sustainable development strategy. [0003] Recycled aggregate is the aggregate obtained after crushing, cleaning, grading and matching with each other in a certain proportion from waste concrete. Concrete made using recycled aggregate as part or all of the aggregate is called recycled aggregate concrete, or recycled concrete for short. Reprocessing of waste concrete can be realized through recycled aggre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/08
Inventor 肖建庄陈恩慈
Owner TONGJI UNIV
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