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Recycled concrete prepared from pipe pile centrifugal surplus paste

A recycled concrete and pipe pile centrifuge technology, applied in the field of recycled concrete, can solve the problems of low concrete strength, unstable strength development, fast setting speed of residual slurry, etc., and achieve stable strength development, excellent fluidity, and good stability

Inactive Publication Date: 2019-03-22
SHANGHAI CONSTRUCTION GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of recycled concrete prepared by using the centrifugal residual slurry of pipe piles, which overcomes the low strength of the concrete prepared by using the centrifugal residual slurry of pipe piles in the existing concrete technology, which has a fast setting speed of the residual slurry and uneven concrete coagulation. In order to solve the problem of unstable strength development, the waste slurry resources discharged after the centrifugal forming process in the production process of pipe piles are effectively used to turn waste into treasure; the prepared recycled concrete has excellent fluidity, high strength and stable strength. The performance indicators are in line with the technical performance indicators of concrete, which can be used in engineering practice

Method used

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  • Recycled concrete prepared from pipe pile centrifugal surplus paste
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Examples

Experimental program
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Effect test

Embodiment 1-3

[0030] The proportioning ratio of the residual slurry for preparing recycled concrete in Examples 1-3 is shown in Table 1. The ultra-high performance recycled concrete is obtained after mixing and stirring the components evenly. The working performance and mechanical properties of the ultra-high performance concrete are shown in Table 2. Show.

[0031] Table 1 Unit: kg / m 3

[0032]

[0033] Remarks: The addition amount of high-efficiency water reducer in Examples 1-3 is 1.2%, 1.1%, and 1.2% of the sum of the weight of cement, fly ash, and granulated blast furnace slag powder, respectively.

[0034] Table 2

[0035]

[0036] From the experimental results in Table 2, it can be seen that the recycled concrete prepared by using the centrifugal slurry of pipe piles in the present invention has an initial slump of 210-230 mm, and a 1-hour slump ≥ 190 mm. It has excellent fluidity and good workability. 3-day compressive strength: ≥10MPa; 7-day compressive strength: ≥15MPa; 2...

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Abstract

The invention provides recycled concrete prepared from a pipe pile centrifugal surplus paste. The recycled concrete comprises the following components: cement of 150-200kg / m<3>, fly ash of 50-100kg / m<3>, granulated blast furnace slag powder of 50-100kg / m<3>, water of 130-160kg / m<3>, a temperature-controlled and coagulation-controlled surplus paste of 100-150kg / m<3>, recycled aggregate of 800-1000kg / m<3>, yellow sand of 700-800kg / m<3>, and a high-efficiency water reducing agent, wherein a method for preparing the temperature-controlled and coagulation-controlled surplus paste comprises: fully cooling a high-temperature surplus paste generated by centrifugation of a pipe pile, adding a retarder, and fully stirring the materials to prepare the temperature-controlled and coagulation-controlledsurplus paste. The recycled concrete is obtained by mixing and stirring evenly according to the above formula, has excellent fluidity, high strength, and very high strength stability, and can be usedin engineering practice.

Description

technical field [0001] The invention belongs to the technical field of recycled concrete in construction engineering, and in particular relates to recycled concrete prepared by utilizing the centrifugal residual slurry of pipe piles. Background technique [0002] Pipe pile centrifugal slurry is a kind of concrete dehydrated slurry (waste slurry) formed in the high-speed centrifugal molding production process in the production process of pipe piles, 1m 3 The average discharge of pipe pile concrete is 0.05m 3 The remaining pulp weighs about 90kg. Pipe pile centrifugal slurry is an alkaline cement-containing slurry, which contains a large amount of unhydrated cement, water reducing agent, mineral admixture, quartz powder and other substances. Due to the high-speed centrifugal dehydration process, the glue-water ratio of the residual slurry is very low, so the concrete made with the centrifugal residual slurry of pipe piles usually has low strength, and the uneven setting of c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B18/08C04B18/141C04B18/167C04B14/06C04B2103/302
Inventor 王圣怡许永和徐俊史晓婉
Owner SHANGHAI CONSTRUCTION GROUP
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