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

Table 2

Results of calibration test on Rings A and B showing strain measured at point load P = 12 and 16 kN applied at Loc 1 (see Figure 3).

Ring	Strain gauge in Loc 1	Applied force	Strain (µε)			Elastic modulus (GPa)
		(kN)	MP1	MP2	MP3	MP1	MP2	MP3
A	MP1	12	88	−39	−33	258	210	249
		16	119	−50	−44	255	219	249
	MP2	12	−32	88	−37	256	258	222
		16	−44	118	−49	249	257	223
	MP3	12	−34	−35	93.8	241	235	243
		16	−49	−49	127	223	223	239
B	MP1	12	94	−38	−35	242	216	235
		16	125	−52	−47	243	210	233
	Mid MP1–MP2	12	−39	−37	89	210	222	256
		16	−52	−50	121	211	219	251
	MP2	12	−35	96	−40	235	237	205
		16	−48	128	−53	228	237	027
	Mid MP2–MP3	12	84	−41	−35	271	200	235
		16	114	−55	−45	266	199	243
	MP3	12	−36	−33	92	228	249	248
		16	−48	−46	122	228	238	249
	Mid MP1–MP3	12	−37	89	−38	222	256	216
		16	−49	119	−51	223	255	215

MP stands for the measurement point, which is a full Wheatstone bridge shown in Figure 2.