This study aims to enhance fiber-reinforced super-workable concrete (FR-SWC) by optimizing the system of shrinkage-reducing admixture (SRA) and macro-synthetic fiber (MSF) for low shrinkage and uncompromised mechanical properties. A factorial design approach was employed to model the effect of fiber content, SRA dosage, and combined ratios of two types of MSF on performance of FR-SWC. MSF content had the greatest impact on mechanical properties, followed by SRA and MSF combination. Using MSF increased equivalent flexural strength ratio by 310% compared to the control mixture, regardless of MSF combination and SRA. SRA had the most significant effect on drying shrinkage, followed by MSF content and MSF combination. The combination of SRA and MSF factors reduced 7- and 56-d drying shrinkage by up to 60% and 35% compared to the control mixture without compromising mechanical properties. The developed models accurately predicted engineering properties of FR-SWC with relative errors of less than 15%. The high-desirability mixtures with 0.5% fiber content, 1:0–0.75:0.25 fiber combination, and 1.25%− 2.5% SRA were verified and recommended.


Civil, Architectural and Environmental Engineering


Missouri University of Science and Technology, Grant 00064859

Keywords and Phrases

Engineering properties; Fiber-reinforced super-workable concrete; Macro synthetic fibers; Mixture optimization; Shrinkage-reducing admixture; Statistical models

International Standard Serial Number (ISSN)


Document Type

Article - Journal

Document Version


File Type





© 2024 Elsevier, All rights reserved.

Publication Date

02 Feb 2024