Investigating the positive effects of wollastonite and micro-silica on the mechanical properties and permeability of composite concrete in normal and sulfated environment
1
Professor, Civil Engineering Department, University of Mohaghegh Ardabil
2
M.Sc, Department of Civil - Structural Engineering, University of Mohaghegh Ardabili
10.22124/jcr.2025.30973.1707
Abstract
This research investigates the combined effects of wollastonite and micro-silica as partial cement replacements on the mechanical properties and durability performance of composite concrete under both standard curing and corrosive environment (sulfate exposure) conditions (5% and 10% MgSO₄ solutions). A total of 288 concrete cube specimens were cast and tested for compressive strength, water permeability, dynamic modulus of elasticity, and water absorption at 28 and 90 days. Wollastonite was incorporated at replacement levels of 7.5%, 15%, and 20%, while microsilica was added at 4% and 7%. The results revealed that the mixture containing 20% wollastonite and 7% micro-silica exhibited the highest reduction in water permeability (up to 63.46%) and water absorption (up to 13.39%), particularly in sulfate-rich environments. Furthermore, mixtures with 7.5% wollastonite and 7% microsilica showed a notable improvement in compressive strength, with increases of up to 17.18% under 5% sulfate exposure. Regression analysis indicated strong correlations between compressive strength, water absorption, and permeability across all curing conditions (R² > 0.90). These findings suggest that the use of wollastonite, particularly in combination with microsilica, can significantly enhance the mechanical performance and durability of concrete, while also offering environmental and economic benefits due to its natural availability, low energy processing, and potential synthesis from industrial waste materials. Also, wollastonite's simple production processes have made it an environmentally friendly material.
Mohammadi, Y. and Shafiei, S. (2025). Investigating the positive effects of wollastonite and micro-silica on the mechanical properties and permeability of composite concrete in normal and sulfated environment. Concrete Research, (), -. doi: 10.22124/jcr.2025.30973.1707
MLA
Mohammadi, Y. , and Shafiei, S. . "Investigating the positive effects of wollastonite and micro-silica on the mechanical properties and permeability of composite concrete in normal and sulfated environment", Concrete Research, , , 2025, -. doi: 10.22124/jcr.2025.30973.1707
HARVARD
Mohammadi, Y., Shafiei, S. (2025). 'Investigating the positive effects of wollastonite and micro-silica on the mechanical properties and permeability of composite concrete in normal and sulfated environment', Concrete Research, (), pp. -. doi: 10.22124/jcr.2025.30973.1707
CHICAGO
Y. Mohammadi and S. Shafiei, "Investigating the positive effects of wollastonite and micro-silica on the mechanical properties and permeability of composite concrete in normal and sulfated environment," Concrete Research, (2025): -, doi: 10.22124/jcr.2025.30973.1707
VANCOUVER
Mohammadi, Y., Shafiei, S. Investigating the positive effects of wollastonite and micro-silica on the mechanical properties and permeability of composite concrete in normal and sulfated environment. Concrete Research, 2025; (): -. doi: 10.22124/jcr.2025.30973.1707
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