Home Improvement Siding Kitchen Windows Vinyl Pools Patio Security 0238

Section 27 – Curbs, Gutters, Sidewalks, and Drainage Structures

signposts. Supply and installation of PVC pipe sections shall be considered incidental and

included in the various unit prices paid for median construction.

27-3.05 Minor Curb and Gutter and Sidewalk Replacement

For minor curb and gutter and sidewalk replacement (single location only), the Contractor

may use a portable concrete mixer, or a one (1) yard transit-mix truck. Pre-mixed “buggy”

concrete is not acceptable. The amount of concrete placed by this method shall not exceed

twelve (12) cubic feet. A 50-50 mixture of concrete mix (fine and coarse aggregate) may be

used. The mix shall be proportioned (aggregate and cement approximately 4:1) such that an

equivalent five (5) sack mix is obtained. The County inspector may make concrete test

cylinders in order to verify the mix. Test cylinders should attain strength of twenty-five hundred

(2500) psi in twenty-eight (28) days.

Minor concrete that does not attain twenty-five hundred (2500) psi in twenty-eight (28) days

shall be removed and replaced with transit mix concrete at the Contractor’s expense.

This method of mixing and placing concrete applies only to minor curb and gutter and

sidewalk replacement.

All damage done or openings cut in concrete walks, curbs, or gutters during the progress of

the Work shall be repaired by the Contractor to the satisfaction of the Agency. Patching of

damaged areas shall not be allowed. Partial removal and replacement of flags of sidewalk or

portions of curbs and/or gutters less than four feet (4’) in length will not be allowed. All removal

of damaged sidewalk and/or curbing and gutter sections shall extend to the nearest score mark,

weakened plane joint, construction joint or expansion joint if within four feet (4’) of the limit of

damaged concrete. Damaged areas shall be removed per detail and replaced to the

satisfaction of the Agency without additional cost to the Agency.

27-5 SLOPE OF SIDEWALKS

Unless otherwise shown or specified in the Contract, sidewalks and planting strips between

curb and sidewalk shall slope uniformly toward the street at a rate of one-quarter inch per foot of

width (1/4” per 1’). The transverse slope of the finished surface shall be uniform to a degree

such that no depressions greater than 0.01 foot are present when tested with a ten-foot (10’)

straightedge laid in a direction transverse to the centerline and extending across the width of the

27-6 CURB DOWELS AND REINFORCEMENT

Where shown or specified in the Contract, curb dowels and reinforcement shall be installed.

The dowels and reinforcement shall conform to Section 31, “Reinforcement”, of these

27-7 EXTRUDED CONSTRUCTION

At the Contractor's option, subject to the Agency's approval, curbs, gutters, and sidewalks

may be constructed monolithically using an approved extrusion machine.

Concrete for extruded construction shall be Class "B-2”, as specified in Section 50-1,

“Portland Cement Concrete”, of these Specifications. The grading limits shall be restricted if

necessary to produce concrete that, after extrusion, has well defined web marks of water on the

surface and is free from surface pits larger than three-sixteenths-inch (3/16”) in diameter.

The consistency of the concrete shall be such that it will maintain the shape of the section

without support after extrusion.