Table 1.

Experimental factors and levels.

Experimental Factor	Levels	Number of Levels
Strength of Concrete (Proportioning Strength)	NSC 1 (30 MPa), UHPC (180 MPa)	2
Tamping Condition	Tamping, Non-tamping	2
Delay of the Cold Joint	0, 15, 30, and 60 min	4

¹ Normal-strength concrete.