(A) General. The work performed under these standards shall consist of the construction of Portland cement concrete sidewalks constructed as described herein. Such sidewalks shall have a minimum width of five feet and a minimum thickness of five inches except the thickness shall be six inches where passing across an existing or proposed driveway and where passing over public utility lines. The length of the thickened slab where passing over public utility lines shall be a minimum of ten feet. New sidewalks abutting existing sidewalks shall be constructed to meet the grade of such sidewalks or as may be directed by the Village Engineer or his representative. The location of sidewalks and grade for sidewalks when no adjacent sidewalks exist, shall be as directed by the Village Engineer or his representative.
(B) Materials. All materials shall comply with the following standards of quality:
Materials Standards
(1) Portland cement ASTM C-150 Type I, Normal
ASTM C-150 Type III, High- Early- Strength
(2) Fine aggregate ASTM C-33, clean sand grated between #100 and #4 sieve limits
(3) Course aggregate ASTM C-33, uncoated crushed stone or washed gravel
(4) Water Potable and fit to drink
(5) Water-reducing admixture ASTM C494 Type A (normal) or Type D (retarder)
(6) Air entraining agent ASTM C-260
(7) Premolded filler strips ASTM D-994
(8) Curing compound ASTM C-309, Type I
(9) Reinforcement ASTM A615, Grade 40
(C) Concrete quality.
(1) Use ready-mix concrete, complying with ASTM C-94 and supplied by a ready-mix source which is inspected yearly by the State Highway Department, unless otherwise permitted by the Village Engineer or his representative. Delivery tickets shall note the mix designation, time dispatched, date, project, and contractor, and shall be available for review by the Village Engineer or his representative.
(2) Concrete mix design shall be contractor's responsibility. Prior to concrete delivery, submit a report from a Commercial Testing Laboratory on the proposed mix proportions to the Village Engineer for approval. Prior to concrete delivery, submit laboratory reports on 7- and 28-day strengths of each proposed mix. No concrete will be allowed to be placed until the mix designs have been approved.
(3) Concrete mix shall be designed using the following data:
(a) Minimum compressive strength of 3500 psi at 28 days.
(b) Minimum of six sacks of cement per cubic yard.
(c) Maximum size aggregate of one inch.
(d) Air entrainment of 6% ± 1%.
(e) Maximum slump of four inches.
(f) Maximum water content including moisture in the aggregate of six gallons per sack of cement.
(g) All concrete shall contain a water- reducing admixture with no reduction in cement content permitted.
(D) Subgrade preparation. Where a fill condition exists, remove all topsoil and unsuitable material. Tamp or roll subgrade before placing granular fill. Fill shall be placed in six inch layers to the proper subgrade elevation. Side slopes of fill material shall not exceed one foot vertical to three feet horizontal. Where a cut condition exists, remove all topsoil and unsuitable material and remove subgrade to the proper elevation allowing sufficient width to accommodate the forms.
(E) Granular base. Place a granular base of two inch minimum thickness on the prepared subgrade. The base shall extend the full width of the sidewalk.
(F) Forms. Side forms shall be of lumber of not less than two inches nominal thickness or steel of equal rigidity. No two by four lumber forms will be permitted. Forms shall be held securely in place by stakes or braces with the top edge true to line and grade. The forms for the sidewalk shall be set so that the slab will have a fall of one-inch vertical to four feet horizontal from the edge nearest the property line toward the edge farthest from the property line, except as may be otherwise directed by the Village Engineer or his representative.
(G) Reinforcing. Reinforcing bars shall be embedded in the concrete at mid-depth in a longitudinal direction over all existing water or sewer services or other utilities buried beneath the sidewalk. Three ¾-inch diameter bars, each with a minimum length of ten feet shall be installed over each utility. The bars shall be equally spaced across the width of the sidewalk.
(H) Expansion joints. Expansion joints of the thickness specified below shall consist of a pre-molded filler strip with the top of the strip placed ¼ inch below the surface of the sidewalk.
(1) One-half inch thick expansion joints. Expansion joints ½-inch thick shall be placed between the sidewalk and all structures such as light standards, traffic light standards, and traffic poles, which extend through the sidewalk.
(2) Three-fourth inch thick expansion joints. Expansion joints ¾-inch thick shall be placed at intervals of 50 feet in the sidewalk where specified by the Village Engineer. Where the sidewalk is constructed adjacent to pavement or curb having expansion joints, the expansion joints in the sidewalk shall be placed opposite the existing expansion joints as nearly as practicable. Expansion joints shall also be placed where the sidewalk abuts existing sidewalks, between driveway pavement and sidewalk, and between sidewalk and curbs where the sidewalk abuts a curb.
(I) Placing and finishing concrete.
(1) Notify the village when the subgrade has been finished with a minimum of 24 hours notice prior to placing concrete. No concrete shall be placed until the subgrade has been inspected and approved by the village.
(2) The subgrade shall be moistened just before the concrete is placed. The concrete shall be placed in successive batches for the entire width of the slab, struck off from ½ to ¾ inch higher than the finished slab, tamped until all voids are removed and free mortar appears on the surface, thoroughly spaded along the edges, struck off to the true grade, and finished to a true and even surface with floats and trowels. The final troweling shall be done with a steel trowel, leaving a smooth, even surface. After the water sheen has disappeared, the surface shall be given a final finish by brushing with a fine-hair broom. The broom shall be drawn across the sidewalk at right angles to the edges of the walk, with adjacent strokes slightly overlapping, producing a uniform, slightly roughened surface with parallel marks.
(3) Control joints shall be constructed at right angles to the center line of the sidewalk and shall extend to ¼ the depth of the sidewalk. They shall not be less than 1/8 inch nor more than ¼ inch in width, and shall be edged with an edging tool having a ¼-inch radius. All slabs shall be five feet long on any one side, unless otherwise ordered by the Village Engineer or his representative.
(J) Protecting from low temperatures. After the first seasonal frost, protect concrete from freezing for not less than 48 hours after placing. The contractor shall be responsible for all concrete damaged by low temperatures and any concrete so damaged shall be removed and replaced by him at his expense.
(K) Curing.
(1) Sidewalks must be cured by one of the following methods:
(a) Place burlap on the finished surface, saturate with water and cover with an impermeable covering.
(b) Place polyethylene sheeting as soon as the concrete has hardened sufficiently to prevent marring of the surface. Wet the surface of the concrete immediately before the sheeting is placed. The edges of the sheeting shall be weighted securely with a continuous windrow of earth or any other means satisfactory to the village to provide an airtight cover.
(c) Apply specified curing compound with brush, roller, or spray at the rate of one gallon for every 250 square feet of sidewalk.
(2) Any of the above curing methods must remain in place for not less than six days.
(L) Backfill. After the concrete has been cured, forms shall be removed and the space near the edges of the sidewalk shall be backfilled to the required elevation with material approved by the village. The material shall then be compacted until firm and the surface evenly graded.
(M) Disposal of surplus material. Surplus or waste material resulting from the sidewalk construction operation shall be disposed of by the contractor.
(N) Control of materials. The contractor shall, at his expense, have a commercial testing laboratory prepare and test samples of delivered concrete. One set of tests shall be taken for the first 25 cubic yards and one set of tests shall be taken for each 50 cubic yards. A set of tests shall consist of four standard cylinders (two shall be broken at seven days and two shall be broken at 28 days), one slump test, and one air content test. The laboratory shall perform tests in accordance with recognized ASTM standards and shall submit written reports of such tests to the village for review.
(O) Guarantee.
(1) All work constructed under these standards shall be guaranteed by the contractor to be free from defects in workmanship and materials for a period of one year from the date of written acceptance of the completed work by the village. He shall replace or repair any defective work or material upon written notice from the village that such defects exist.
(2) A bond shall be deposited with the village in the amount of 15% of the improvement cost at the time of acceptance of the sidewalk as collateral security for the guarantee.
(Ord. 77-05, passed 4-6-77) Penalty, see § 156.99