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. 2013 May 10;6(5):1920–1939. doi: 10.3390/ma6051920

Figure 1.

Figure 1

Unconfined compressive strength (R) of cylindrical specimens as a function of the Si/Al ratio at 7 days (black dotted curve) and 28 days (red curve). Error bars indicate the average deviation from the mean over the three samples measured.