Investigation of the Effect of Marble Powder Fineness on the Mechanical and Physical Properties of Cement Mortars

Abstract

This research explored how marble powder with two particle size ranges (0–45 µm and 0–75 µm), when used as a partial cement replacement, influences the physical and mechanical behavior of mortars. As a recycled by-product with environmental and economic advantages, marble powder was incorporated at replacement levels of 5–40 %, and specimens were prepared accordingly. The experimental program assessed compressive strength, ultrasonic pulse velocity (UPV), water absorption, and chloride penetration after 28 and 90 days of curing. The results indicated that low replacement levels (5–10 %) improved performance, particularly in compressive strength and UPV. At higher levels (15–20 %), however, increased porosity led to a reduction in all measured properties. The finer marble powder (0–45 µm) enhanced matrix densification, resulting in better strength and permeability outcomes compared to the coarser fraction (0–75 µm), which showed weaker performance at elevated replacement ratios. Overall, the findings suggest that incorporating marble powder in controlled proportions and with appropriate particle size can be a viable approach to producing sustainable mortars with satisfactory mechanical and durability characteristics.