This work shall consist of the construction of portland cement concrete sidewalks on a gravel base course to the dimensions shown in the details.
A. 
The gravel base shall conform to the requirements of State Form 810, Article M.02.01.
B. 
The concrete shall conform to the requirements of State Form 810, Article M.03.01, Class C concrete.
C. 
The concrete shall contain not less than 5% nor more than 7% entrained air at the time the concrete is deposited in the forms.
D. 
No admixture other than an air-entraining agent shall be used without express permission of the Engineer.
E. 
The maximum allowable slump shall be four inches.
Concrete sidewalks shall not be constructed after October 1 nor before April 15 unless methods of protection are approved by the Engineer.
A. 
Excavation. Excavation, including removal of any existing sidewalk, shall be made to the required depths below the finished grade as shown on the plans or as directed. All soft and yielding material shall be removed and replaced with suitable material.
B. 
Gravel base. The gravel base shall be placed in layers not over six inches in depth and to such a depth that after compaction it shall be at the specified depth below the finished grade of the walk. The base shall be wetted and rolled or tamped after the spreading of each layer.
C. 
Forms. Forms shall be of metal or wood, straight, free from warp and of sufficient strength to resist springing from the pressure of the concrete. If of wood, they shall be of two-inch surfaced plank, except that at sharp curves thinner material may be used. If of metal, they shall be of approved section and shall have a flat surface on the top. Forms shall be of a depth equal to the depth of the sidewalk. Forms shall be securely staked, braced and held firmly to the required line and grade and shall be sufficiently tight to prevent leakage of mortar. All forms shall be cleaned and oiled or wetted before concrete is placed against them. Sheet metal templates 1/8 inch in thickness, of the full depth and width of the walk, shall be spaced at intervals of 12 feet or as directed. If the concrete is placed in alternate sections, these templates shall remain in place until concrete has been placed on both sides of the template. As soon as the concrete has obtained its initial set, the templates shall be removed.
D. 
Finishing. The surface of the concrete shall be finished with a wood float or by other approved means. The outside edges of the slab and all joints shall be edged with a one-fourth-inch-radius edging tool. Each slab shall be divided into two or more sections by forming dummy joints with a jointing tool as directed.
E. 
Curing.
(1) 
Curing shall be done with a liquid membrane-forming curing compound approved by the Engineer. The material shall be a combination curer-hardener-sealer-type compound and shall be similar or equal to Demicon Temp Color as manufactured by the McMillan Products Division of the Hausman Steel Company of Detroit, Michigan. The rate of application shall be in accordance with the manufacturer's instructions.
(2) 
The curing compound shall be applied to all exposed surfaces of the concrete immediately following the disappearance of the water sheen following the final finishing and before any marked dehydration of the concrete or surface checking occurs.
(3) 
When the forms are removed before seven days after the concrete has been placed, the exposed sides shall be covered with the compound at the same rate as applied to the surface.
(4) 
If the film is damaged by rain or in any other way before drying, the curing compound shall be reapplied to the affected areas.
F. 
Backfilling and removal of surplus material. The sides of the sidewalk shall be backfilled with suitable material thoroughly compacted and finished flush with the top of the sidewalk. All surplus material shall be removed and the site left in a neat and presentable condition to the satisfaction of the Engineer.