Dewndence of Frost Resistance on the Pore Structure of Mortar Containing Silica Fume
Huang Cheng-yi and R. F. Feldman
Appears on pages(s):
freeze-thaw durability; measuring instruments; microstructure;mortars (material); porosity; silica; water-cement ratio.
Mortars prepared at water to cement and silica fume [w/(c + sfl] (0, 10, and 30 percent by weight) ratios of 0.45 and 0.60 were assessed for resistance to freeze-thaw cycles. Pore size distribution was measured by mercury intrusion and reintrusion experiments were per-formed after distillation of mercury. Results indicate that addition of silica fume changes the pore structure, and that pore volume in the pore size ranges of 20,000 to 2000 and 2000 to 350 nm increases, whereas accessibility to the pores decreases. Frost resistance of mortars containing no entrained air and prepared at a w/(c + sf) ratio of 0.60 was improved greatly with the addition of silica fume.