Composition and Structure
The pavement as originally laid was composed of two levels of concrete made in a method similar to that used to pave sidewalks. Aside from Bartholomew's cement, made from clay and limestone, the concrete included aggregate of no larger than ½ and 1½ inches (top and bottom layers respectively), with water-cement ratios of 0.45 and 0.60 (top and bottom), laid on a 4-inch (100 mm)-deep base. Mixed by hand, the concrete has an air mixture of about 8% and a total strength of about 34.5 megapascals, or slightly over 5,000 psi. The total cost of paving the street was approximately $9,000, aside from the bond. Restorations performed on the pavement since the original construction have proven less resilient; most patches in poor condition are those that have been restored, with Bartholomew's remaining segments withstanding damage more satisfactorily.
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