Figure 2: Test column that was waterproofed and subjected to artificial wetting. Note cracks from ASR in shaft and mushroom slab.

Figure 2 shows one of the columns that were the subject of the experiment and Figure 3 shows a psychrometer installed in one of the columns. Figure 4 shows the results of two sets of measurements on the untreated control column and the column treated with Penetrant 1 (silicone). Not all of the columns are in the same physical condition. Some are completely sound, but others show signs of ASR attack, in the form of cracks in the columns, or in the mushroom slabs they support, or both. As it happened, the control column is completely sound whereas the silicone-treated column has a badly cracked mushroom slab, although the column itself has only minor cracks in it.