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Table 2 The dry and saturated weight, water absorption, and compressive strength of the rock samples

From: Acid solution decreases the compressional wave velocity of sandstone from the Yungang Grottoes, Datong, China

Samples Dry weight (g) Saturated weight (g) Increase of weight (g) Water absorption (%) Compressive strength (kg cm−2)
Natural state Soaked with H2SO4 Soaked with HNO3
#1 87.109 89.158 2.049 2.35 708 280 348
#2 74.138 75.757 1.619 2.18 614 240 334
#3 70.800 72.436 1.636 2.31 543 202 297
#4 79.149 81.101 1.952 2.47 609   
#5 95.996 98.121 2.125 2.21 626   
#6 84.325 86.204 1.879 2.23 618   
Mean ± SD 81.920 ± 9.195 83.796 ± 9.388 1.877 ± 0.210 2.29 ± 0.11 620 ± 53 241 ± 39 326 ± 26