608Minor Concrete Paving

Minor Concrete Paving

608.1DESCRIPTION

1 This section describes the requirements for constructing sidewalks, bike paths, median paving, ditch paving, and other minor paving.

608.2MATERIALS

1 Provide materials in accordance with the following: Material Subsection Admixtures 801.4 Aggregate for Concrete 803 Bed Course Material 803 Curing Material 802.1 Fly Ash 801.2 Joint Materials 807 Joint Sealer 807.1 Portland Cement 801.1 Reinforcing Steel 811.1 Water 814.1

608.3EQUIPMENT

1 Ensure that equipment meets the following: Equipment Subsection Batch Plant 513.3.1 Mixers 513.3.2 Placing Equipment 513.3.3 2 Use a slip-form machine that places, spreads, consolidates, screeds, and finishes the concrete in one pass, providing a dense and homogeneous section with minimal hand finishing.

608.4CONSTRUCTION

608.

4.1General

1 Construct the foundation to a depth and width allowing for the installation and bracing of forms or operation of a slip-form paver. Compact the foundation to the requirements of Subsection 203.4.3, Embankment and Cut Areas with Moisture and Density Control, and

Minor Concrete Paving SECTION 608 shape to the section specified. Remove soft and yielding material and replace with approved material. 2 Place concrete at least 4 in [100 mm] thick. 3 When welded wire fabric is specified, positively support reinforcing to minimize vertica l or lateral movement of the fabric and place in accordance with Subsection 514.4.5, Placing and Fastening. 608. 4.1.1 Placing Concrete 1 Use class B concrete in accordance with Subsection 513.4.4, Mix Design. The engineer may approve a local commercial mix. The department does not require aggregate gradation tests or cement sample submission. 2 Form, place, and consolidate concrete in accordance with applicable portions of Subsection 513.4, Construction, and as follows for the method of placement used:

med Method. Extend forms for the full depth of the concrete so that they are straight, free from warp, and strong enough to resist the pressure of the concrete without springing. Brace and stake forms to maintain horizontal and vertical alignment until removed. Treat forms with a release agent compatible with the concrete and the form.

meets the specified lines and grades and has the specified surface texture. Use the machine to shape, vibrate, and extrude the concrete for the full width and depth of the placement section and with a continuous forward movement. Use concrete of a consistency capable of maintaining the section’s shape without support. 3 Finish outside edges of slab and joints with a ¼ inch [6 mm] radius edging tool. Finish sidewalks and bike paths with a light broom texture. 608.4.

1.2Joints

1 Space joints to coincide with joints in adjoining concrete. Construct joints in new concrete paving as follows:

jointing tool. Extend contraction joints into the concrete to at least one-third of the concrete’s depth. Ensure a joint width of ⅛ in [3 mm]. Space contraction joints at 10-foot [3 m] intervals or at a distance equal to the paving width, whichever is less. If the paving width exceeds 10 ft [3 m], place a longitudinal contraction joint at the width’s midpoint. Do not space transverse joints farther apart than this same distance of half the paving width.

Minor Concrete Paving SECTION 608

preformed expansion joint material, at the following locations:

2.1Radius points;

2.2Junctions with existing concrete;

2.3Around rigid structures;

2.4In line with expansion joints in adjacent concrete pavement;

2.5At intervals not to exceed 150 ft [45 m] in continuous runs of concrete

paving; and

2.6Between back of curb and sidewalk, if the adjacent roadway pavement is

concrete and there is lateral constraint other than soil on the opposite side of the sidewalk.

Use preformed joint material, ½ in [12 mm] thick, that extends the depth of the section. Seal with silicone joint sealant.

608.4.1.3 Curing

1 Cure concrete in accordance with applicable portions of S ubsection 513.4.13, Curing Concrete. Do not allow pedestrian and vehicular traffic on concrete during curing.

608.4.2 Sidewalk and Curb Ramps

1 Construct sidewalks to provide accessibility consistent with ADA standards, current at the time of award, unless otherwise approved by the engineer. Provide sidewalk curb ramps at street intersections and other specified locations. Do not install drainage structure grates or access covers in sidewalk curb ramps.

2 Construct type I or type I modified sidewalk curb ramps. If conditions do not allow adequate clear right-of-way, type II or III may be constructed depending on specified sidewalk width and the engineer’s approval.

3 Install ramps as close to the intersection as possible, within pedestrian crossing markings when present, and perpendicular to the curb section. Color concrete with red pigment where specified. Do not use surface treatment to obtain red color of the concrete.

608.4.3 Surface Tolerance

1 For sidewalks and bike paths, leave the finished surface without variation greater than 3/16 in [5 mm] every 10 ft [3 m] in any direction; correct excess variation by removal and replacement or grinding.

Minor Concrete Paving SECTION 608

608.5MEASUREMENT and PAYMENT

608.

5.1General

1 The engineer will measure:

ncrete, Sidewalk (Conc), Bike Path (Conc), Median Paving (Conc), and Ditch Paving (Conc) by the square foot [square meter] or square yard [square meter] of paved surface. Measurement will be parallel to the paved surface.

adjacent sidewalk. 2 The department will pay as follows: Pay Item Pay Unit Measure to the Nearest Pay to the Nearest Bike Path (Conc) SF, SY [m2] 0.1 ft, 0.1 ft [0.05 m] SF, 0.1 SY [0.1 m2] Concrete SF, SY [m2] 0.1 ft, 0.1 ft [0.05 m] SF, 0.1 SY [0.1 m2] Ditch Paving (Conc) SF, SY [m2] 0.1 ft, 0.1 ft [0.05 m] SF, 0.1 SY [0.1 m2] Median Paving (Conc) SF, SY [m2] 0.1 ft, 0.1 ft [0.05 m] SF, 0.1 SY [0.1 m2] Sidewalk (Conc) SF, SY [m2] 0.1 ft, 0.1 ft [0.05 m] SF, 0.1 SY [0.1 m2] 608.

5.2Referenced Sections for Direct Payment

1 When specified, the engineer will measure and pay for:

d Course Material in accordance with Section 301, Aggregate Materials. Measurement specified by the cubic yard [cubic meter] will be based on neat lines.

and Gutter in accordance with Section 609, Curb and Gutter.

driveway, as Double Gutter in accordance with Section 609, Curb and Gutter, when a thicker section than the adjacent sidewalk is specified.

classified E xcavation in accordance with Section 203, Excavation and Embankment.