Experimental Study to Determine the Failure Criteria of Concrete at Its Early-Age

Table 4

The test results of a C20-concrete at an early-age during the standard process of curing (MPa).

Test	Age
	Standard curing for 3 days		Standard curing for 4 days		Standard curing for 5 days		Standard curing for 6 days		Standard curing for 7 days
Uniaxial tension	1.17		1.26		1.32		0.35		1.38
Uniaxial compression	−12.81		−15.21		−16.89		−18.21		−18.90
	Axial pressure	Radial pressure	Axial pressure	Radial pressure	Axial pressure	Radial pressure	Axial pressure	Radial pressure	Axial pressure	Radial pressure
Biaxial compression-compression 1	−14.5	−2.0	−16.8	−2.0	−19.3	−2.0	−21.4	−3.0	−22.5	−3.0
Biaxial compression-compression 2	−17.2	−4.0	−19.4	−4.0	−21.5	−5.0	−23.6	−6.0	−24.6	−6.0
Biaxial compression-compression 3	−17.7	−6.0	−20.7	−7.0	−23.1	−8.0	−24.6	−9.0	−25.7	−9.0
Biaxial tension-compression 1	0.97	−2.00	1.02	−2.00	1.10	−2.00	1.15	−2.00	1.19	−2.00
Biaxial tension-compression 2	0.86	−3.00	0.94	−3.00	0.98	−3.00	1.02	−3.00	1.10	−3.00