SEC. 43-71. DESCRIPTION; COMPOSITION OF CONCRETE AND MORTAR USED IN CONSTRUCTION.

   Curb, curb and gutter and separate gutter shall consist of a concrete core and a mortar surface.

   The minimum compressive strength of the concrete and requirements for the quantity of mixing water and the concrete slump must conform to the city of Dallas Addendum to Public Works Construction Standards – North Central Texas as published by the North Central Texas Council of Governments, current edition. Mortar shall be composed of one part Portland cement, one and one-half parts fine aggregate and water. (Ord. 8590; 31313)

SEC. 43-72. CONSTRUCTION OF JOINTS.

   Three-fourths inch expansion joints shall be spaced at 25 to 30 foot intervals or as otherwise specified. The three-fourths inch expansion joints shall be filled with a three-fourths inch premoulded bituminous expansion joint filler or other approved type and shall extend the entire depth and width of the concrete section. Curb and gutter shall be grooved three-eights inch deep on five-foot centers. (Ord. 8590)

SEC. 43-73. FORMS.

   Wooden forms shall have a nominal thickness of two inches, surfaced one side and one edge and shall be straight and devoid of warps, twists, knot holes and other defects to prevent leakage of concrete or mortar. (Ord. 8590)

SEC. 43-74. PLACEMENT OF CONCRETE AND MORTAR.

   (a)   Foundation or subgrade for all work must be set at the grades determined by the director. The director may inspect the foundation, subgrade, and reinforcing before concrete is poured.

   (b)   Concrete must be thoroughly compacted so that the minimum thickness conforms to the requirements of this article. Concrete must be free from honeycombing, rock pockets, and separation and segregation of ingredients. Upon completion of the concrete core, the one-half inch mortar surface must be placed while the core is still green, the work being carried on uniformly so that a perfect bond is obtained between the concrete core and mortar surface. (Ord. Nos. 8590; 22026)

SEC. 43-75. FINISHING.

   The mortar surface shall be thoroughly troweled, not less than twice, to a uniformly smooth surface and brush finished. Exposed edges of the gutter and back of curb shall be rounded to a one-half inch radius. (Ord. 8590)

SEC. 43-76. PROTECTION OF NEW WORK FROM TRAFFIC; BACKFILLING.

   Curb, curb and gutter and separate gutter shall be protected from vehicular traffic for not less than six days.

   Earth or sand shall be used for backfill and shall be thoroughly compacted, care being taken not to injure the completed work. (Ord. 8590)

SEC. 43-77. FINAL DIMENSIONS; GUTTER RATIO REQUIRED FOR CURB FACING; DWELLING FOR DRIVEWAY CONSTRUCTION.

   Curb and gutter shall have the back 12 inches deep and vertical. Curb shall be six inches thick at the top, face battered 1:3. The gutter shall be uniformly six inches thick and a minimum of 24 inches in width, except where gutter joins gutter of a greater width.

   Where driveways are to be constructed, the curb may be laid back, radius begun and No. 3 (three-eights inch diameter) round bars, exposed 15 inches, placed on 24 inches center to center for dowels. (Ord. 8590)