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

Table 6

Characteristic of cracks occurred on concrete rings.

Ring	Crack	Crack width (mm)	Initial crack length (mm)	Final crack length (mm)	Age appeared (day)	Comment
A	A1	<0.1	60	90	19	Not fully propagated
	A2	<0.1	60	60	22	Not fully propagated
	A3	0.7	200	200	22	Top half cracked
	A4	0.7	—	200	39	Bottom half cracked
B	B1	<0.1	55	55	22	Not fully propagated
	B2	<0.1	100	100	22	Not fully propagated
	B3	<0.1	200	200	22	Minor crack
	B4	1	200	200	22	Through full height