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Method for preparing high-strength semi-regenerative coarse aggregate concretes

A technology for regenerating coarse aggregate and coarse aggregate, which is applied to the preparation of high-strength semi-recycled coarse aggregate concrete and the field of semi-recycled high-strength concrete, can solve the problems of inability to meet actual engineering needs and low strength of semi-recycled coarse aggregate concrete. Achieve the effect of improving strength, wide applicability and reducing cost

Active Publication Date: 2013-02-13
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing semi-regenerated coarse aggregate concrete has low strength and cannot meet the needs of actual engineering. Based on the double-mixing technology of the absolute volume method, the prepared product has good working performance, high early strength, fast development of late strength, and low collapse. High-fluidity, high-strength semi-recycled coarse aggregate concrete whose slump meets pumpability requirements

Method used

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  • Method for preparing high-strength semi-regenerative coarse aggregate concretes
  • Method for preparing high-strength semi-regenerative coarse aggregate concretes
  • Method for preparing high-strength semi-regenerative coarse aggregate concretes

Examples

Experimental program
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Effect test

Embodiment 1

[0034] 1 selection of materials

[0035] It is preferred to select recycled aggregates with continuous grading within the particle size range of 5-25mm, with water absorption of 3.23%, moisture content of 1%, crushing index of 12.51%, apparent density of 2290kg / m3, and porosity of 44.3%. Ordinary aggregates with a particle size of 5-25mm and continuous gradation are preferred, with a moisture content of 1% and an apparent density of 2760kg / m3. Xingda first grade fly ash, density 2300kg / m3. The sand is natural medium sand with a water content of 5%-9%, a stone content of 15%-25%, and an apparent density of 2670kg / m3. Silver water mineral powder (S95) has an apparent density of 1227kg / m3. 42.5 grade Beishui cement has an apparent density of 3100kg / m3. Polycarboxylate high-efficiency water reducer (water reducing rate 28%) has a density of 1130kg / m3 and a solid content of 10%. The water is tap water with a density of 1000kg / m3.

[0036] 2 mix ratio calculation

[0037] (1) D...

Embodiment 2-7

[0054] Embodiment 2-7 The preparation of semi-regenerated coarse aggregate concrete, the selection of materials and the calculation of the mix ratio are basically the same as in Example 1. According to the calculation in step 2, each group of semi-regenerated concrete is 1m 3 For example, Table 1-3; the trial mixing process is the same as step 3.

[0055] Table 1-3 Example 2-7 group semi-recycled coarse aggregate concrete mix ratio

[0056]

Embodiment 1-7

[0057] Embodiment 1-7 Measured value of compressive strength of semi-regenerated coarse aggregate concrete

[0058] Table 1-4 Example 1-7 Semi-regenerated coarse aggregate concrete 3 days, 7 days and 28 days strength measured values

[0059] mix number

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Abstract

The invention discloses a method for preparing high-strength semi-regenerative coarse aggregate concretes, and belongs to the technical field of regenerative coarse aggregate concretes. The preparation method comprises the step of preparing the high-performance semi-regenerative coarse aggregate concretes with good working performance, high early strength and good development in long-term strength by regulating the mixing amount of additives, mineral powder and coal ash in reference to the using amount of rubber materials of the common concretes.

Description

technical field [0001] The invention relates to a method for preparing high-strength semi-regenerated coarse aggregate concrete, in particular to a method for preparing semi-regenerated high-strength concrete above 50Mpa by using a composite double-mixing technology of adding primary fly ash and slag under the condition of a high-efficiency water reducer. Technical field of recycled coarse aggregate concrete. technical background [0002] Semi-recycled coarse aggregate concrete is a kind of recycled concrete prepared by replacing 30%-50% of the natural aggregate in ordinary concrete with recycled coarse aggregate. The concrete removed from the building is manually classified, crushed, cleaned, and graded to form continuously graded recycled aggregates instead of natural aggregates, which not only handles a large amount of construction waste, but also reduces its environmental pollution and waste of land resources. Moreover, the actual project of reusing the garbage saves th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B18/30C04B18/16
CPCY02W30/91
Inventor 曹万林许方方董宏英张建伟郜泰刘波峰
Owner BEIJING UNIV OF TECH
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