Also, seen in Fig. 4, in the case of (Marble dust + soil (B)), the carbonation increases in the beginning and
then decreases. The increase in the beginning is due to higher pH of dust compared to soil (B). According to
our inference, lump formation in marble dust during experiments diminished its carbonation capacity. The
surface area available for carbonation decreases with lump formation. Thus, as marble dust content increased,
less carbonation occurred. This was confirmed by results in the case of (Marble dust + soil (A)). Soil (A) and
marble dust had almost same initial pH, and thus, carbonation decreased with increasing marble dust content.