What question did this study set out to answer?

The research aims to understand how varying ratios of raw phosphogypsum affect the mechanical properties and pore structure of cementitious materials.

April 25, 2026Open Access

Effect of Microscopic Pore Structure on the Mechanical Properties of Raw Phosphogypsum–Basalt Fiber Cementitious Materials

Puntos clave

The research aims to understand how varying ratios of raw phosphogypsum affect the mechanical properties and pore structure of cementitious materials.
Six different PG replacement levels (0%, 3%, 6%, 9%, 12%, 15%) applied to cementitious material with constant basalt fiber (0.1%).
Mechanical properties assessed through 7-day and 28-day compressive, split tensile, and flexural strength tests.
Pore distribution analyzed using liquid nitrogen adsorption and scanning electron microscopy.
28-day compressive strength decreased by 49%, split tensile strength by 44%, and flexural strength by 43% as PG content increased.
Pore fractal dimensions ranged from 2.52 to 2.62, indicating a more intricate and less homogeneous structure with higher PG levels.
A strong correlation (R > 0.82) exists between pore structure metrics and mechanical strength outcomes.

Resumen

This study investigates the mechanical properties and internal pore structure characteristics of raw phosphogypsum–basalt fiber (RPG-BF) cementitious materials with varying raw phosphogypsum (PG) replacement ratios. Specifically, six different PG addition levels (0%, 3%, 6%, 9%, 12%, and 15% by mass of cementitious materials) with a constant basalt fiber dosage of 0.1% (by volume of concrete) were adopted. The mechanical properties of RPG-BF cementitious materials were evaluated by testing the 7-day and 28-day compressive strengths, 28-day split tensile strength, and 28-day flexural strength. Meanwhile, the pore distribution characteristics of the RPG-BF cementitious materials were systematically analyzed using liquid nitrogen adsorption (LNA) tests and scanning electron microscopy (SEM) observations. The experimental results indicate the following: (a) With an increase in PG content, the mechanical properties of RPG-BF cementitious materials exhibit a significant downward trend: the 28-day compressive strength, split tensile strength, and flexural strength decrease by 49%, 44%, and 43%, respectively. (b) The internal pores of the RPG-BF cementitious materials possess excellent fractal characteristics, with fractal dimensions ranging from 2.52 to 2.62. As the PG content increases, the pore structure becomes more intricate and less homogeneous, which is a microstructural factor associated with the degradation of mechanical properties. (c) There exists a strong Pearson’s linear correlation (R > 0.82, with R2 ranging from 0.67 to 0.94) between the pore fractal dimension of RPG-BF cementitious materials and their 7-day/28-day compressive strength, split tensile strength, and flexural strength. (d) SEM observations show that the quantity of micropores and microcracks in the RPG-BF cementitious materials increases with increasing PG content, further confirming deterioration of the material microstructure.

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Cite This Study

Xu et al. (Thu,) studied this question.

synapsesocial.com/papers/69ec5a2588ba6daa22dababc https://doi.org/https://doi.org/10.3390/buildings16091654

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