Effect of Hybrid Steel-Basalt Fiber on Behaviors of Manufactured Sand RPC and Fiber Content Optimization Using Center Composite Design

Table 4

Physical and chemical properties of mineral powder.

Properties		Standard value	Actual value
Physical properties	Specific surface area (m^2/kg)	≥400	429
	Liquidity ratio (%)	≥95	102
	Density (%)	≥2.8	2.8
Chemical properties	Moisture content (%)	≤1.0	1.0
	Loss on ignition (%)	≤3.0	3.0
	Pozzolanic activity index (%)	7 days ≥ 75	83
		28 days ≥ 95	98