Repairing Asphalt Pavement Work Done for the City of Chicago Under Contract in
Repairing Asphalt Pavement Work Done for the City of Chicago Under Contract in
Ill Chicago Bureau of Public Efficiency Chicago
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"The final com- pression shall be effected by a ten-ton roller, or the equivalent of not less than 250 pounds per running inch width. " At no time has there been any but the large roller on the work, and should it be placed in use when the material is too hot it causes the mixture to roll, which is difficult to overcome, unless the repair is large enough to allow of diagonal and cross rolling by an experienced mechanic. Should the surface mixture be al- lowed to become too cool before rolling, ...the material, when compressed, does not bond properly and a weak pavement re- sults. It is therefore very important that both rollers should be used. Repairing Asphalt Pavement 15 7. Lack of Stone in Binder. The specifications permit the contractor to crush old asphalt surface paving mixtures and use this material in combination with the binder stone in making binder. The first inspection made by the Bureau disclosed that the old material was being used, but that no stone was in the binder. It was nothing unusual to find pieces of the old pavement in this binder, showing the careless manner in which it had been prepared.
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