Large Ring Test for Evaluation of Restrained Shrinkage Cracking: Calibration and Experimental Trial

Table 1

Comparison between the ASTM C1581 (2009), AASHTO T334 (2008), and upscaled ring used in this study.

Parameter			ASTM; C1581	AASHTO; T334	Upscaled ring
Inner radius of the steel ring		RIS (mm)	152.5	140.0	545
Outer radius of the steel ring		ROS (mm)	165.0	152.5	600
Outer radius of the concrete ring		ROC (mm)	202.5	228.5	800
Height of concrete and steel ring		h (mm)	150	152	200
Drying direction			Circumferential	Circumferential	Radial
ROS to ROC ratio		ROC/ROS (m m^−1)	1.23	1.50	1.33
Exposed surface-to-volume ratio		Sexp/V (m^2 m^−3)	29	16	10
Degree of restraint—see Equation (1)		DOR (%)	80	70	78
Hoop strain on steel as per Equation (2)	If εC–sh = 300 µε	εS (µε)	70	100	75
	If εC–sh = 1,000 µε		225	335	250