Sec. 42-91. - Application of subdivision.
Sec. 42-92. - Depth and width of excavations; preparation of subsurface.
Sec. 42-95. - Forms for the concrete.
Sec. 42-96. - Wetting while compacting the subbase.
Sec. 42-97. - Thickness and type of concrete generally.
Sec. 42-99. - General requirements for cement.
Sec. 42-100. - Stone dust or sand.
Sec. 42-101. - Coarse aggregate, etc.
Sec. 42-102. - Concrete mixture proportions generally.
Sec. 42-103. - Method of measuring concrete.
Sec. 42-105. - Ramming and smoothing.
Sec. 42-106. - Joints generally.
Sec. 42-107. - Concrete to be cut into blocks.
Sec. 42-108. - Adjoining curbs to be repaired.
Sec. 42-110. - Contractor's name to be stamped or inlaid in sidewalk.
Sec. 42-113. - Cross gutters, etc., for drainage purposes.
Sec. 42-114. - Edges to be backed up.
Sec. 42-115. - Adjoining sidewalks to be left in good condition.
Sec. 42-116. - Surplus materials to be removed upon completion of work.
Secs. 42-117—42-135. - Reserved.
Sec. 42-91. - Application of subdivision.
This subdivision applies to concrete sidewalks.
Sec. 42-92. - Depth and width of excavations; preparation of subsurface.
Excavations for construction of sidewalks shall be dug to a depth of eight inches below the established grade, for the full width of the sidewalk and for a distance of three inches on each side thereof. All soft and spongy places shall be removed and all depressions filled with suitable material and thoroughly tamped or rolled until it is brought to a firm, unyielding surface.
(Code 1968, § 45-31)
Trees shall not be injured while sidewalks are being constructed, but roots of trees which in any way interfere with the construction work and its maintenance in a proper manner may be cut away under the supervision of the city forester.
(Code 1968, § 45-32)
Upon the subgrade formed as provided in this subdivision shall be placed a layer of clean furnace cinders, bank-run gravel, bats or stones not less than one inch nor more than three inches in diameter. This shall be thoroughly wetted and rammed with a rammer weighing not less than 20 pounds until the mass is entirely compacted, settled and brought to an even surface parallel with and four inches below the established grade of the sidewalk.
(Code 1968, § 45-33)
Sec. 42-95. - Forms for the concrete.
Wooden or metal forms four inches in height shall be placed in position in the manner necessary to accurately outline the external edges of the sidewalk, the top of the forms conforming to the proper finished grade of the surface of the pavement. The forms shall be of sufficient thickness and strength for the purpose, and be well staked and braced both on curved and on straight work, so as not to bulge under pressure of the ramming, but when drawn will leave the work to exact dimensions and lines. All wood forms shall be thoroughly wetted and metal forms oiled before depositing any material against them. All mortar and dirt shall be removed from forms that have been previously used.
(Code 1968, § 45-34)
Sec. 42-96. - Wetting while compacting the subbase.
While compacting the subbase, the material shall be kept thoroughly wet, and shall be wet when the concrete is deposited, but shall show no pools of water.
(Code 1968, § 45-35)
Sec. 42-97. - Thickness and type of concrete generally.
Upon the subbase formed and finished as provided in section 42-96, there shall be placed the pavement composed of monolithic concrete, four inches in thickness, except as provided in section 42-98.
(Code 1968, § 45-36)
The concrete cross drives shall be six inches in thickness. The subbase shall be prepared as specified in section 42-97 for sidewalks allowing for the additional two inches in thickness.
(Code 1968, § 45-37)
Sec. 42-99. - General requirements for cement.
Cement shall meet the requirements of the current Standard Specifications for Portland Cement of the American Society for Testing Materials.
(Code 1968, § 45-38)
Sec. 42-100. - Stone dust or sand.
The stone dust or sand used shall be reasonably clean and sharp with its grains graded in size from fine to coarse, containing no more than three percent of clay and loam, and free from all vegetable matter or other impurities. Bank run sand shall not be used.
(Code 1968, § 45-39)
Sec. 42-101. - Coarse aggregate, etc.
Coarse aggregate shall consist of clean, durable, crushed rock, pebbles or crushed blast furnace slag, graded in size, free from vegetable or other organic matter, and shall contain no soft, flat or elongated particles. If necessary, it shall be screened and washed to produce this product. The slag shall not contain more than 1½ percent of sulphur as sulphides. The size of the coarse aggregate shall range from one inch down, not more than five percent passing a screen having four meshes per linear inch, and no intermediate sizes shall be removed. Bank run gravel shall not be used.
(Code 1968, § 45-40)
Sec. 42-102. - Concrete mixture proportions generally.
(a)
Unless otherwise specifically approved by the department of public works, the concrete for the sidewalks and cross drives shall be central-mix concrete that will show a compressive strength under a 28-day test of not less than 3,000 pounds per square inch. The compression test of the concrete shall be made in cylinders having a diameter equal to one-half the length; the standard cylinder of concrete shall be six inches in diameter and 12 inches in length. When ordering central-mix concrete for sidewalk curbing and paving, the contractor shall specify that the delivery slip for the material shall show the name of the company furnishing the material, the strength of the concrete, percentage of calcium chloride, if any, aggregate and slump of the concrete delivered. When requested to do so, the contractor, or his representative on the work, shall present such delivery slip to the code enforcement officer or his authorized representative.
(b)
If, with the approval of the department of public works, concrete for sidewalks and cross drives is mixed directly upon the work, such concrete shall be composed of one part by volume of Portland cement, 1½ parts by volume of sand or stone dust, and three parts by volume of gravel, crushed stone or slag.
(Code 1968, § 45-41)
Sec. 42-103. - Method of measuring concrete.
The method of measuring the materials for the concrete, including water, shall be one which will insure separate and uniform proportions of each of the materials at all times. A sack of Portland cement, 94 pounds net, shall be considered one cubic foot.
(Code 1968, § 45-42)
Water shall be clean, free from oil, acid, alkali, vegetable or other organic matter.
(Code 1968, § 45-43)
Sec. 42-105. - Ramming and smoothing.
The concrete shall be thoroughly rammed, special care being taken to ram along the edges. After the concrete has been brought to the established grade by means of a strike board, it shall be worked by a wooden float in a manner which will provide a surface free from depressions or irregularities.
(Code 1968, § 45-44)
Sec. 42-106. - Joints generally.
(a)
A one-quarter inch expansion joint of approved type shall be provided at least every 20 feet in the length of the sidewalk, which shall be filled with a suitable expansion strip. A similar expansion strip shall be provided at each intersection of sidewalk and street curb. Each day's work shall stand separately and shall not be joined into that done on any other day.
(b)
The concrete placed during the day shall end against a timber or metal stop placed across the pavement between the side strips. On the side of this timber or metal stop and next to the concrete shall be placed an expansion strip one-quarter inch thick the full width and depth of the pavement.
(c)
When the timber or metal stop is removed the next morning, the expansion strip shall be left to form an expansion joint.
(d)
A one-quarter inch expansion strip shall be placed around all solid objects that fall within the area of the new concrete sidewalk, such as water stops, light poles, etc., except cellar doors.
(e)
Where the full width of the sidewalk, i.e., from the curb to the building line, is paved, a one-quarter inch expansion strip shall be placed adjacent to either the curb or the building line.
(Code 1968, § 45-45)
Sec. 42-107. - Concrete to be cut into blocks.
(a)
Before finishing the surfacing of the concrete sidewalk or crosswalk, the concrete shall be cut into blocks of uniform size approximately five feet square.
(b)
The cuts in the sidewalk concrete, except expansion joints, shall be made by a hand double edging tool with a cutting blade at least one-half inch in depth and one-quarter inch thick.
(c)
All finished joints shall show rounded edges, the radius of which shall be not less than one-quarter inch nor more than one-half inch.
(Code 1968, § 45-46)
Sec. 42-108. - Adjoining curbs to be repaired.
Before a concrete sidewalk paving is placed next to the curb, the contractor shall, at the owner's expense, make the necessary repairs to any portion of the curb, either stone or concrete, that does not meet or conform to specifications of the department of public works for sidewalk curbing.
(Code 1968, § 45-47)
(a)
When the concrete sidewalk or curb work is completed, or at the end of each day's work, the concrete shall be protected and be cured for at least two days.
(b)
The curing shall be done by covering the finished concrete, sidewalk or curb, after final set, with burlap, canvas, sisal-kraft, etc., and the covering shall be kept thoroughly wet for at least two days; or, in lieu of the foregoing, the concrete, sidewalk or curb, may be sprayed, at the rate of one gallon for each 200 square feet, with "Clearkure," "Masterkure," or an approved equal liquid curing compound acceptable to the department of public works.
(Code 1968, § 45-48)
Sec. 42-110. - Contractor's name to be stamped or inlaid in sidewalk.
(a)
The contractor shall mark his name in the sidewalk, either by stamping or by inlaying an improved metal plate. The stamped letters shall be one inch high and one-quarter inch deep. If a metal plate is used, the top of the plate shall be flush with the top of the sidewalk.
(b)
The contractor's name shall be placed at each end of the finished sidewalk up to 100 feet in length. Beyond the 100 feet length, the contractor's name shall be placed at the ends of the finished sidewalk and middistant between the ends.
(Code 1968, § 45-49)
Suitable barriers shall be erected and red lights provided at night to protect the sidewalk from traffic. No concrete shall be laid in freezing weather, or upon a frozen subgrade or subbase.
(Code 1968, § 45-50)
The transverse grade of the sidewalk shall be a uniform rise of not less than one-quarter inch per foot and not more than one-half inch per foot, extending from the curb at its proper elevation to the building line. The running grade shall conform to the true curb grade. The finished surface shall not vary more than one-quarter inch in any part from a true plane.
(Code 1968, § 45-51)
Sec. 42-113. - Cross gutters, etc., for drainage purposes.
Cross gutters or depressions in concrete sidewalks for drainage purposes leading from alleys or rain conductors are prohibited.
(Code 1968, § 45-52)
Sec. 42-114. - Edges to be backed up.
At the completion of the entire work, all edges of the sidewalk shall be backed up level with the grade of the sidewalk so as to preserve the pavement and present a neat appearance.
(Code 1968, § 45-53)
Sec. 42-115. - Adjoining sidewalks to be left in good condition.
The sidewalk adjoining the new pavement shall be left in as good condition as before the work was commenced, and if disturbed in any way, shall be relaid in a proper and satisfactory manner.
(Code 1968, § 45-54)
Sec. 42-116. - Surplus materials to be removed upon completion of work.
When the work regulated by this subdivision is completed, all surplus materials, whether old or new, shall be removed, leaving the sidewalk, gutter and roadway free and unobstructed.
(Code 1968, § 45-55)