Volume 25, Issue 5 pp. 3703-3714
ARTICLE

A new method for determination of segregation stability of pumped ready-mixed concrete: Rapid wet-sieved test

Lei Li

Lei Li

Department of Structural Engineering, College of Civil Engineering, Tongji University, Shanghai, China

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Qi Deng

Corresponding Author

Qi Deng

Department of Structural Engineering, College of Civil Engineering, Tongji University, Shanghai, China

Correspondence

Qi Deng and Zhenhua Duan, Department of Structural Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China.

Email: [email protected] and [email protected]

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Ahmed Nasr

Ahmed Nasr

Department of Structural Engineering, College of Civil Engineering, Tongji University, Shanghai, China

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Jiaqian Wang

Jiaqian Wang

State Key Laboratory of Hoisting Machinery, Changsha, China

Zoomlion Heavy Industry Science& Technology Development Co., Ltd, Changsha, China

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Junyou Chen

Junyou Chen

Hongxiang Environmental Industry Co., Ltd, Haining, China

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Zhenhua Duan

Corresponding Author

Zhenhua Duan

Department of Structural Engineering, College of Civil Engineering, Tongji University, Shanghai, China

Correspondence

Qi Deng and Zhenhua Duan, Department of Structural Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China.

Email: [email protected] and [email protected]

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First published: 28 February 2024

Lei Li and Qi Deng contributed equally to this work and are co-first authors.

Abstract

In the process of pumping, the segregation of concrete mixture will lead to the difficulty of construction, and even the possibility of pipe blocking. There is a lack of a quickly evaluation for on-site construction. In order to solve this problem, a rapid wet-sieved test was proposed in this study and then its feasibility was evaluated based on concrete mixes with different water–cement ratios. Subsequently, the influence of sand ratio on the segregation degree of concrete was investigated. The test results show that a combination of 2.36 mm screen size and 20 s vibrating time did the best. The wet-sieved mortar content and stratification degree were increased by 4.6%–25.2% and 0.3%–17.9% by pumping, respectively. With the sand ratio increasing from 0.40 to 0.60, the pumping pressure decreased by 51.9%. The linear fitting correlation between pumping pressure and wet-sieved mortar content (0.96) is better than that between pumping pressure and stratification degree (0.85), which indicates that the proposed test method can reliably characterize the degree of segregation during the pumping of ready-mixed concrete.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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