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

Table 5

Physical and chemical properties of superplasticizer.

Properties		Standard value	Actual value
Physical properties	Water reduction rate	≥25	28
	Gas content (%)	≤6.0	2.9
	Bleeding rate (%)	≤60	37
Chemical properties	Cl^− (%)	≤0.1	0.02
	OH^− (%)	≤3	2
	Na2SO4	≤0.5	0.2