The rapid growth of the concrete industry has led to growing pressure on natural resources and increased environmental degradation. To address this, researchers are actively investigating green and sustainable alternatives to traditional concrete materials, particularly cement and sand. Wollastonite, a naturally occurring calcium metasilicate mineral, has gained attention as a promising supplementary cementitious material in concrete technology. This study focuses on evaluating the performance of Indian wollastonite microfibres in concrete, analysing properties such as workability, density, compressive strength, flexural strength, tensile strength and microstructure. Wollastonite also contains an amorphous silica phase and polymorphic forms of calcium carbonate, which contribute to enhanced hydration when combined with Portland cement. This study examined the effect of replacing cement with wollastonite in varying proportions ranging from 0% to 20%. It was found that a 15% replacement yielded a 28-day compressive strength of 37.89 MPa, nearly equal to that of conventional concrete. In addition, the incorporation of wollastonite improved the durability of the concrete mix. These findings highlight wollastonite’s potential as a sustainable and effective partial cement replacement, offering both environmental benefits and mechanical performance comparable to standard materials. It may also serve as a substitute for proprietary admixtures in modern concrete construction.
Sangeetha et al. (Mon,) studied this question.