633Concrete Gutter and Dumped Rock Gutter

633.1 Description:

This work shall consist of the construction of open flow -ways for surface drainage, using concrete gutter or dumped rock gutter, in accordance with these Specifications and in reasonably close conformity with the lines, grades, dimensions, and cross sections shown on the Plans or established by the Engineer.

633.2 Materials:

Materials shall conform to the following Subsections of Division 700, except as modified: MATERIAL SUBSECTION Aggregate Filter Layer 704.7 Cement for Grout 701.1 or 701.3 Crushed Aggregate 704.6, Class 10 Dumped Rock Gutter 704.4 Expansion Joint Material (Preformed) 708.1, 708.2 Joint Sealing Material 708.3 Reinforcing Steel 709.1, 709.4 Sand for Grout 702.1.1 through 702.1.5 and

702.2 or 702.6

Waterstops (Elastomer Materials) 708.10 Class B concrete for gutters shall meet the requirements of 601. CONSTRUCTION METHODS

633.3 General:

Excavation for all gutters shall be made to the required depth. For concrete gutters, the base upon which the gutter is to be constructed shall be compacted to a firm, even surface. All soft and unsuitable material shall be removed and replaced with suitable material which shall be thoroughly compacted. Where the location of any gutter falls on rock of a suitable nature, the Engineer may eliminate the gutter within the limits of the rock. When necessary, the rock shall be shaped to direct the flow of water back to the gutter beyond the limits of the rock.

633.4 Concrete Gutter:

633.4.1 Forms: Forms shall be of wood or metal of sufficient strength to retain the

concrete and shall be set and securely fastened in place, true to the lines and grades given.

633.4.2 Placing and Finishing Concrete: Class B concrete shall be placed and screeded

true to profile and contour either by hand or machine methods. The surface finish shall be a wood float finish when placed by hand methods. When placed by machine method, the hand finishing shall be held to the minimum required to attain the Plan profile and cross section.

633.4.3 Joints and Cut-Off Walls: Expansion joints of the type and thickness specified

on the Plans shall be installed at intervals not to exceed 50 -ft unless otherwise shown. If adjacent to a pavement in which joints have been used, expansion joints shall be placed opposite those in the pavement. Contraction joints shall be provided at approximately 12½ feet intervals. Contraction joints shall have a minimum depth of one -fourth of the specified gutter thickness plus ¼ inch tolerance, shall be ⅝ inch (nominal) in width, and shall be formed by using removable templates, scoring, sawing, or other methods approved by the Engineer. No filler material will be required for construction or contraction joints. A concrete cut -off wall, reinforced as detailed on the Plans, shall be constructed at the beginning and at the end of each gutter and at locations designated on the Plans or by the Engineer. Cut -off walls shall be constructed at approximately 150 feet intervals along the gutter for grades 5 to 25 percent (5-25%) and at approximately fifty (50) feet intervals for grades greater than 25 percent (25%).

633.4.4 Curing: The concrete gutter shall be protected and cured by wetting for a period

of three days after placing, or it shall be cured by white membrane curing materials in accordance with 501.14.4.

633.4.5 Waterstops: Waterstops shall be placed at all expansion joints in the gutter and

where a concrete gutter abuts a proposed structure. Provisions shall be made to properly place the waterstop in the structure. In case of a concrete gutter which abuts an existing structure, a groove ¾ inch by two (2) inches shall be left and filled with joint sealer. Waterstops shall conform to the requirements shown on the Plans.

633.5 Dumped Rock Gutter:

Unless otherwise noted in the plans, a four (4) inch thick filter layer shall be constructed on the bottom of dump rock gutter to prevent erosion at the soi l/rock interface. The filter layer material shall meet the quality and gradation requirements of 704.7 or Class 10 aggregate. Dumped rock gutter may be dumped from trucks and bulldozed into place in a manner similar to the placing of rock fill. Hand pla cement will not be required. The rock gutter shall be constructed to the thickness and grade shown on the Plans. A thickness deficiency in excess of 10 percent (10%) will not be permitted. The dumped rock gutter may be obtained from the unclassified excavation. If suitable material is not available from the unclassified excavation, it shall be the responsibility of the Contractor to furnish this material at no additional cost. Locations of probable sources for dumped rock gutter will be listed in the Plans.

633.5.1 Grout for Dumped Rock Gutter: Grout for Dump Rock Gutter shall be defined

as per Section 633.2 with interstices filled with spalls and grouted cement grout. The grout filler shall be composed of a mixture of one part Portland cement and three parts sand, mixed with water to produce a workable consistency. The amount of water shall be that designated by the Engineer. The stone shall be thoroughly wet immediately before grout is applied. As soon as the grout is deposited on the surface, it shall be thoroughly worked into the joints. The stones shall then be brushed so that their top surfaces are exposed. Grouted Dump Rock Gutter shall be cured in accordance with any of the methods specified in 501.15, with a blanket of earth kept wet for 72 hours, or by sprinkling with a fine spray of water every two hours during the day-light hours for a period of three days.

633.6 Method of Measurement:

The quantity of work done for Concrete Gutter" will be measured in square yards, complete in place and accepted, determined by the length, measured along the centerline, time the width. All measurements will be made on the surface of the gutter. The quantity of work done for “Dumped Rock Gutter: will be measured in cubic yards, complete in place and accepted, determined by the dimensions shown on the Plans or established by the Engineer. No excess thickness will be measured for pay quantity. The quantity of work done for “Grouted Dump Rock Gutter” will be measured in cubic yards, complete in place and accepted as determined by the dimensions as shown on the Plans or established by the Engineer. No excess thickness will be measured for pay quantity and no separate payment will be made for the cement grout. Cut-off walls at the beginning and end of the concrete gutter, those cut-off walls constructed on steep grades (five perce nt (5%) or over) in accordance with these specifications and any other cut-off walls designated on the Plans will not be measured separately but will be included in the cost of the gutter. If additional cut-off walls are required by the Engineer during construction, they will be paid for as square yards of concrete gutter; the area will be measured on the vertical face of the cut-off wall and will be the area bounded by the lower extremity of the gutter and the sides and bottom of the wall.

633.7 Basis of Payment:

The quantities, determined as provided above, will be paid for at the contract unit prices bid for the items listed below, which prices and payments shall be full compensation for furnishing all the materials, including reinforcing steel, expansion joint material, joint sealer, waterstops, when called for on the Plans, and all labor, tools, equipment, supplies, and incidentals necessary to complete the work. No separate payment will be made for the excavation.

633.8 Pay Items:

ITEM DESCRIPTION UNIT 633001-* Concrete Gutter Square Yard 633003-* Dumped Rock Gutter Cubic Yard 633004-* Grouted Dump Rock Gutter Cubic Yard * Sequence number SECTION 634 THROUGH SECTION 635-BLANK