(A) When an opening is to be restored in an asphalt surfaced street that has a concrete base, the first operation in restoring the pavement over the trench shall consist of installing a concrete base not less than nine inches in thickness of Class 2, l:7 concrete. A nine-inch depth will be required irrespective of the kind and depth of pavement base in the street at the time the opening was made. After the backfilling has been completed, the material under the edges of the old base shall be dug out to a depth and width of four inches. The material then excavated may be used to round up the backfill in the center, so that the bottom of the new base will be arched in form. The concrete shall be thoroughly tamped under the edges of the old base and shall be brought up to the same level as the top surface of the old base. If it is necessary to further build up the grade of the base, the contractor shall place a separating layer of tar paper, asphalt emulsion, or other suitable material at the level of the top of the old base. Then more concrete may be poured to bring the base up to the desired level. For asphalt paving, the final grade of the base shall be not less than two and one-half inches below the street surface grade. The surface of concrete base which is to receive binder shall be marked or grooved so as to key and prevent displacement of the binder.
(B) The concrete shall stand at least 24 hours before the pavement is laid. The permittee shall keep the pavement blocked against traffic until the base has attained the age of at least three days or for a longer period if so ordered by the Village Engineer.
(C) If, in the opinion of the Mayor, it is advisable to block the street area against traffic for the time required for the setting of ordinary concrete, the permittee shall be required to use an approved brand of quick-setting cement, or a lower water cement ratio, or approved accelerator. Similar steps may be required by the Village Engineer if the base is poured when the temperature is below 40°F.
(2000 Code, § 153.11) (Ord. O-23-81, passed 10-26-1981)