Failure Mechanism and Mechanical Properties of a Retard-Bonded Prestressed Concrete Girder While Curing

Table 2

Cracking load, maximum bending strength, and residual deformation of PC girders.

Specimen	Shore hardness of retarder under tension (D)	Shore hardness of retarder under bending (D)	Test batch	Cracking load (kN)		Ultimate bending strength (kN)		Maximum residual deformation (mm)
				Theoretical value	Measured value	Theoretical value	Measured value
PC 1-0-0	0	0	1	235	245	481	506	12.2
PC 2-0-6		60.8	2	229	227	481	557	7.8
PC 3-0-8		81.3	3	226	240	481	597	18.2
PC 4-0-9		93.0	4	229	250	481	609	27.2
PC 5-6-8	60.8	81.3	3	232	230	481	536	47.4
PC 6-8-8	80.5	81.3	3	219	225	481	526	24.7
Unbonded PC model	—	—	—	235	253	481	507	—
Bonded PC model	—	—	—	229	245	481	614	—