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Concrete Core Samples <br />Carbonation Depth [inches] <br />0.06 <br />0.05 <br />z <br />Y <br />C 0.04 <br />0 <br />c 0.03 <br />2 <br />'Co 0.02 <br />0 <br />0.01 <br />v <br />0 <br />1 2 3 <br />Core Number <br />The carbonation found in the samples ranged between 0" — 0.05". <br />- Chloride Content: Chloride salts react with the concrete and reduce its alkalinity. When <br />that happens, the protective layer surrounding the rebar is broken and rebar corrosion <br />starts. The cores were tested at the bottom, middle and top. Based on the results, the <br />chloride content obtained ranged from 375 to 660 parts per million (ppm) at the top <br />sections of the cores, from 990 to 1,220 ppm at the middle and from 380 to 1,050 ppm <br />at the bottom section of the cores. <br />Page 26 of 98 37 <br />Chloride Content <br />Chloride Content at <br />Chloride Content at <br />Core <br />at Top <br />middle <br />bottom <br />Number <br />(ppm) <br />(ppm) <br />(ppm) <br />Main House <br />Footing <br />375 <br />1,200 <br />1,050 <br />Exterior <br />Column <br />660 <br />990 <br />380 <br />Page 26 of 98 37 <br />