All concrete sidewalks shall hereinafter conform to the following specifications.
(a) Forms. Forms shall be of wood or metal, extend for the full depth of the concrete and be of sufficient strength to resist the pressure of the concrete without springing.
(b) Placing and finishing. The subgrade shall be moistened thoroughly immediately prior to placing the concrete. The concrete shall be deposited in a single layer. It shall be struck off with a template and smoothed with a float to obtain a sandy texture. No plastering will be permitted. All outside edges and joints shall be edged with a one-quarter inch radius edging tool. The surface of the walks shall be divided into equally spaced blocks at approximately five-foot intervals to form square blocks. Construction joints shall be formed around all appurtenances such as manholes or utility poles extending into and through the sidewalk. Expansion joint filler shall be installed at property lines and between the walk and any fixed structure, extending the full depth of the walk. The surface of the walk shall have a transverse slope of one-quarter inch per foot, with the low side adjacent to the roadway.
(c) Concrete. Concrete shall be Class C proportioned as follows for each cubic yard.
Gravel | - Coarse Aggregate | 305# | Fine Aggregate | 165# |
Limestone | - Coarse Aggregate | 285# | Fine Aggregate | 180# |
Slag | - Coarse Aggregate | 235# | Fine Aggregate | 195# |
6.5 Sack (94#) | - Cement | 5.7 Gal. of Water (Max.) | ||
(d) Air-entraining portland cement. Air-entraining portland cement shall conform to specification ASTM C-175. The percentage of entrained air shall be from 6 to 9%.
(e) Membrane curing. Immediately after the free water has disappeared on the surface, the concrete shall be sealed by spraying as a fine mist a uniform application of the curing material in such a manner as to provide a continuous, uniform, water-impermeable film without marring the surface of the concrete. The membrane curing shall be applied in one or more separate coats at the rate of at least one gallon per 200 square feet of surface. Curing material shall be thoroughly agitated before use.
(Ord. 1609, passed 5-21-1968)