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Compressive behavior of fiber-reinforced magnesium phosphate cement concrete: Role of fly ash and steel fibers
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DOI：10.1016/j.cemconcomp.2026.106653.png)
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Abstract
En 中文
Magnesium phosphate cement (MPC) is a rapid-hardening, low-carbon binder with growing potential for structural applications. However, the compressive behavior and deformation characteristics of fiber-reinforced MPC concrete (FRMPCC) remain insufficiently understood. This study investigates the effects of fly ash (FA) content, fiber type, and fiber volume fraction on the uniaxial compressive behavior of FRMPCC. Twelve groups of specimens were prepared and evaluated in terms of axial compressive strength (ACS), modulus of elasticity (MOE), peak strain, toughness index, and stress–strain response. The results show that increasing FA content from 5% to 25% reduced ACS by up to 24.8% and MOE by up to 18.6%, while the compressive toughness index increased by up to 47.2%. Fiber incorporation generally reduced ACS, particularly for long straight steel fibers (LSSF) and end-hooked steel fibers (EHSF), with reductions of 19.0%–36.7% and 14.3%–52.7%, respectively. In contrast, short straight steel fibers (SSSF) improved deformation capacity, increasing peak strain by up to 19.6%. All fiber types enhanced compressive toughness, with increases ranging from 24.3% to 123.4%. Microstructural analyses reveal that although FA and fiber additions increased total porosity, they refined the pore size distribution and influenced fiber dispersion, thereby affecting crack development and post-peak behavior. SSSF exhibited the most favorable dispersion and deformation performance. These results provide insight into the mechanical behavior and microstructural mechanisms of FRMPCC and offer guidance for the design and optimization of fiber-reinforced MPC-based materials.
Keywords:
Magnesium phosphate cement
Fiber-reinforced concrete
Fly ash
Steel fibers
Compressive behavior
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