Sidewalks, when required, shall be constructed
as shown on the approved definitive plans. A cross slope toward the
roadway of 1/4 inch per foot shall be maintained for drainage.
A. Bituminous sidewalk.
(1) In constructing all bituminous sidewalks, the material
shall be removed for the full width of the sidewalk to a subgrade
of at least 11 inches below the approved finished grade. The foundation
shall consist of at least eight inches of good binding gravel or crushed
stone, thoroughly rolled and compacted to the satisfaction of the
Board or its designated agent, and shall be brought to grade three
inches below the approved finished grade. Bituminous concrete shall
be laid in two courses, 1 1/2 inches of binder course and 1 1/2
inches of top course, compacted measures.
(2) In areas of fill, the top course shall not be placed
for 90 days unless waived by the Board or its designated agent.
B. Concrete sidewalk.
(1) Cement concrete shall meet the requirements specified
as M4.02.00 (Air Entrained 4000 psi, 3/4 inch, 610) in the Massachusetts
Standard Specifications for Highways and Bridges.
(2) In constructing all concrete sidewalks, the material
shall be removed for the full width of the sidewalk to a subgrade
of at least 12 inches below the approved finished grade. The foundation
shall consist of at least eight inches of good binding gravel or crushed
stone, thoroughly rolled and compacted to the satisfaction of the
Board or its designated agent, and shall be brought to grade four
inches below the approved finished grade.
(3) The concrete sidewalk shall be four inches in depth
and shall have welded steel wire fabric conforming to AASHTO M55 located
at mid-depth.
(4) The forms shall be well staked and thoroughly graded
and set to the established lines.
(5) The concrete shall be placed in alternate slabs 30
feet in length except as otherwise approved. The slabs shall be separated
by transverse preformed expansion joint filler 1/2 inch in thickness
(M9.14.0).
(6) The surface of all concrete sidewalks shall be uniformly
scored into block units of areas not more than 36 square feet. The
depth of scoring shall be at least 1/4 of the thickness of the sidewalk.
(7) After troweling, the surface shall be brushed to produce
a nonslip surface.
(8) When completed, the walks shall be kept moist and
protected from traffic and weather for at least three days.