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Concrete Core Samples <br />Compressive Strength <br />6000 <br />a 5000 <br />s <br />b 4000 <br />a <br />L <br />H 3000 <br />a <br />IA 2000 <br />L <br />CL <br />G 1000 <br />U <br />0 <br />1. Main House Footing 2. Boat House Footing 3. Boat House Footing <br />Core Number <br />The Concrete compressive strength ranged from 4,240 to 4,860 psi. <br />-Carbonation depth: Carbon dioxide from air reacts with the calcium hydroxide in <br />concrete to form calcium carbonate, this process is called carbonation. Carbonation, <br />naturally starts from the exterior surface and progresses inwards. Carbonation actually <br />increases the compressive strength of concrete; however, it also decreases alkalinity, <br />which is essential for corrosion prevention of the reinforcement steel. The results of the <br />testing for carbonation depth are tabulated and charted as follows: <br />Core <br />Carbonation Depth <br />Number <br />[inches] <br />Exterior Column <br />0.05 <br />Main House Footing <br />None Detected <br />7 <br />Page 25 of 98 36 <br />