Complete Stress-Strain Relations of Early-Aged Cementitious Grout under Compression: Experimental Study and Constitutive Model.

As for the post-peak branch, the curve became steeper gradually with the increase in specimen age, indicating that the specimen gradually shows significant brittle characteristics, which is consistent with the conclusion, shown in Figure 7 , that the difference between the ultimate strain (the strain at a stress equal to 85% of the peak stress in the descending branch, ε 0.85 ) and the peak strain of the specimen generally shows a decreasing trend.

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