ArticleScientific reports2026
Influence of siderite aggregate substitution on chloride resistance, durability, and gamma-ray shielding of heavy concrete.
Article in Scientific reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
This study investigates the effect of replacing natural aggregates with siderite (10%, 20%, 30%, and 100%) in heavyweight concretes designed for radiation shielding. Both fine (0-4 mm) and coarse (4-16 mm) siderite aggregates were used, while the binder composition (cement + GGBFS) and water-to-binder ratio (w/b ≈ 0.40) were kept constant. Mechanical, durability, and radiation shielding properties were evaluated through compressive strength, abrasion resistance, ultrasonic pulse velocity, freeze-thaw resistance, high-temperature exposure, chloride migration, and gamma-ray attenuation tests at 1173 and 1333 keV. The results indicate that siderite incorporation generally improves compressive strength, density, and durability-related performance. These improvements may be associated with a more compact internal structure, as reflected by reduced water absorption potential (indirectly inferred from transport-related behavior), lower chloride migration, and higher ultrasonic pulse velocity values. A strong inverse relationship between compressive strength and chloride migration (R² = 0.97-0.87) confirms improved transport resistance, where GGBFS likely contributes to chemical chloride binding, while siderite mainly enhances physical aggregate packing. Gamma-ray shielding performance also improves with increasing siderite content, with coarse aggregate systems showing superior attenuation compared to fine ones. Overall, siderite-modified concretes demonstrate strong potential for durable and radiation-shielding structural applications.
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