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The research aims to assess the mechanical properties and synergy mechanisms of fiber mixtures within seawater coral sand engineering cementitious composites (SC-ECCs).

February 12, 2026Buildings0 citationsOpen Access

Experimental Studies of the Mechanical Properties and Synergy Mechanism of Dispersed Fiber Mixture Reinforcement in ECC with a Multiscale Coral Sand Matrix

YZYi ZhongChina Design Group (China)YPYiling PangShaanxi Polytechnic Institute JCJie ChenNorthern Illinois University

Key Points

The research aims to assess the mechanical properties and synergy mechanisms of fiber mixtures within seawater coral sand engineering cementitious composites (SC-ECCs).
Conducted quasi-static mechanical tests to evaluate tensile performance.
Performed split Hopkinson pressure bar (SHPB) dynamic impact experiments.
Analyzed interactions among different fiber types including PE, POM, CW, and BF.
PE-BF hybrid system achieved a maximum strain capacity of 7.5% for static tensile performance.
Multiscale fiber configuration provided a compressive strength of 119 MPa, a 33% improvement over the PE control group.
Under dynamic impact loading, the multiscale reinforced ECC reached a peak compressive strength of approximately 160 MPa, 28% higher than the control group.

Abstract

This study investigates seawater coral sand engineering cementitious composites (SC-ECCs) characterized by multi-crack propagation and strain-hardening properties, utilizing seawater and coral sand as the primary matrix materials. The research systematically evaluates the interactions between polyethylene (PE), co-polyoxymethylene (POM), calcium carbonate whiskers (CW), and basalt fiber (BF). Quasi-static mechanical tests and split Hopkinson pressure bar (SHPB) dynamic impact experiments were conducted to analyze fiber bridging characteristics, dynamic stress–strain behaviors, and failure morphologies. The results indicate that while the PE-BF hybrid system optimized static tensile performance with a maximum strain capacity of 7.5%, and the multiscale fiber system delivered superior compressive and impact capabilities. Specifically, the multiscale configuration achieved a quasi-static compressive strength of 119 MPa, representing a 33% improvement over the single-doped PE control group. Under high-strain-rate impact loading, the multiscale reinforced HSC-ECC exhibited outstanding impact resistance, reaching a peak dynamic compressive strength of approximately 160 MPa—28% higher than the control group. These findings demonstrate that multiscale fiber reinforcement significantly enhances energy absorption and damage control, providing a robust technical basis for the application of SC-ECC in marine infrastructure subjected to impact loads.

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