Document Type

Article

Publication Date

11-30-2018

Publication Title

Construction and Building Materials

Publisher

Elsevier

Volume

197

First page number:

428

Last page number:

435

Abstract

Returned fresh mix concrete (RFC) is a problem with both economic and environmental impacts. Therefore, investigators have recommended various ways to decrease the amount of RFC in manufacturing facilities. Among the most common procedures are dumping concrete in landfill, recycling it, using the aggregate, and using it to produce concrete blocks. In this study, the authors investigated the behavior of various proportions of RFC mixed with ready-mix plain and retarded concrete. The authors also studied the influence of aging by producing specimens after one, two, three, and four hours. In addition, the researchers investigated controlled and uncontrolled environments by mixing the samples both indoors and outdoors. Workability, setting time, and compressive strength of cylindrical mixed specimens was then evaluated. The results presented acceptable setting times and compressive strengths for most specimens, which means mixing RFC with ready-mix concrete is a suitable alternative for recycling RFC. It is also possible to mix higher proportion of RFC with plain concrete in comparison to retarded concrete, though it is difficult to estimate the optimum combination of RFC and plain concrete.

Keywords

Returned concrete; RFC; Ready mix; Compressive strength; Recycle; Setting time

Disciplines

Construction Engineering and Management

File Format

PDF

File Size

703 Kb

Language

English

Rights

Per publisher: Once the embargo period expires and the full text is released, the post-print must be released and Creative Commons Attribution Non-Commercial No Derivatives License.

Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Available for download on Monday, November 30, 2020


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