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Preparation method of high-strength fully-recycled coarse aggregate concrete

A technology for recycling coarse aggregate and concrete, which is applied in sustainable waste treatment, solid waste management, climate sustainability, etc. It can solve the problems of low strength of fully recycled coarse aggregate concrete, which cannot meet engineering needs, and achieve improved strength. , Wide applicability, optimized interface effect

Active Publication Date: 2014-12-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing all-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 concrete has good working performance, high early strength, fast development of late strength, and low collapse. Large fluidity and high strength fully recycled coarse aggregate concrete with slump meeting pumpability requirements

Method used

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  • Preparation method of high-strength fully-recycled coarse aggregate concrete
  • Preparation method of high-strength fully-recycled coarse aggregate concrete
  • Preparation method of high-strength fully-recycled coarse aggregate concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0034] 1 selection of materials

[0035] Prioritize the selection of recycled coarse aggregate with a particle size range of 5-25mm and continuous grading. The water absorption rate is 3.23%, the moisture content is 1%, the crushing index is 12.51%, and the apparent density is 2290kg / m 3 . Xingda Class I fly ash grade, density 2300kg / m 3 . The sand is natural medium sand, with a moisture content of 5%-9%, a stone content of 15%-25%, and an apparent density of 2670kg / m 3 . Silver water superfine mineral powder (>=S95) apparent density 1227kg / m 3 . 42.5 grade Beishui cement, apparent density 3100kg / m 3 . Polycarboxylate high-efficiency water reducer (water reduction rate 28%) density 1130kg / m 3 , with a solid content of 10%. Water is tap water, density 1000kg / m 3 .

[0036] 2 Calculation of mix proportion of fully recycled coarse aggregate concrete

[0037] (1) Determine the sand rate

[0038] According to historical test experience, the actual sand rate is 46.9%. ...

Embodiment 2-3

[0054] According to step 2 of embodiment 1, embodiment 2-3 recycled coarse aggregate concrete 1m 3 Coordination such as Table 1-3; other steps with embodiment 1.

[0055] Table 1-3 Mix design of fully recycled coarse aggregate concrete (unit: kg)

[0056]

[0057] Table 1-4 Measured values ​​of compressive strength of fully recycled coarse aggregate concrete

[0058] .

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Abstract

The invention discloses a preparation method of high-strength fully-recycled coarse aggregate concrete, belonging to the technical field of recycled coarse aggregate concrete. According to the preparation method, a proper amount of superplasticizer, first-level coal ash and mineral powder are added at a water-gel ratio of 0.36-0.44 to prepare the high-performance fully-recycled coarse aggregate concrete which is good in working property, high in early-stage strength and good in later-stage strength development. The strength of the existing fully-recycled coarse aggregate concrete is low, and the compression strength of the fully-recycled coarse aggregate concrete provided by the invention is over 50Mpa according to actual measurement in 28 days.

Description

technical field [0001] The invention relates to a preparation method of high-strength fully recycled coarse aggregate concrete, in particular to a composite double-mixing technology of adding primary fly ash and mineral powder under high-efficiency water reducer, and belongs to the technical field of recycled coarse aggregate concrete. technical background [0002] Fully recycled coarse aggregate concrete is a recycled concrete prepared by replacing more than 80% 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 to replace natural aggregates, which not only handles a large amount of construction waste, but also reduces its environmental pollution and waste of land resources. , and the actual project of reusing the garbage saves the amount of natural sand and gravel. Therefore, recycled concrete is a green bui...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B18/16
CPCY02W30/91
Inventor 曹万林许方方董宏英张建伟李东华刘波峰
Owner BEIJING UNIV OF TECH
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