Structural Inspection of the Post Office Square Garage, Boston, Ma
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Cracks allow the salt-laden water to flow more rapidly through the slab where it then permeates the bottom surface of the slab. The chlorides deposited at the reinforcing lower the pH and set up electrical potentials at the bar surface. This condition results in galvanic corrosion of the reinforcing steel. The corrosion produces corrosion products which have greater volume than the original stable metal. This expansion of the reinforcing steel volume produces bursting tensile stresses within th...e concrete, causing delaminatlon and eventually spoiling of the concrete cover over the reinforcing. Delamination is an indication that the corrosion is at an advanced stage and that spoiling is imminent. Once delamination begins, air, moisture and chlorides can more easily attack the bar surface and the deterioration process accelerates.
The size and number of delaminated areas documented on the second floor together with the fact that all of the areas sounded on the first floor showed signs of delamination leads us to conclude that much of the top steel at the first and second floors is in the advanced stage of corrosion.
What to read after Structural Inspection of the Post Office Square Garage, Boston, Ma?
You can find similar books in the "Read Also" column, or choose other free books by Simpson, Gumpertz & Heger to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Cracks allow the salt-laden water to flow more rapidly through the slab where it then permeates the bottom surface of the slab. The chlorides deposited at the reinforcing lower the pH and set up electrical potentials at the bar surface. This condition results in galvanic corrosion of the reinforcing steel. The corrosion produces corrosion products which have greater volume than the original stable metal. This expansion of the reinforcing steel volume produces bursting tensile stresses within th...e concrete, causing delaminatlon and eventually spoiling of the concrete cover over the reinforcing. Delamination is an indication that the corrosion is at an advanced stage and that spoiling is imminent. Once delamination begins, air, moisture and chlorides can more easily attack the bar surface and the deterioration process accelerates.
The size and number of delaminated areas documented on the second floor together with the fact that all of the areas sounded on the first floor showed signs of delamination leads us to conclude that much of the top steel at the first and second floors is in the advanced stage of corrosion.
What to read after Structural Inspection of the Post Office Square Garage, Boston, Ma?
You can find similar books in the "Read Also" column, or choose other free books by Simpson, Gumpertz & Heger to read onlineMoreLess
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