1054 Concrete sidewalk ramps, of the type shown on the plans, will be measured either as a unit for each or by square foot, as listed in the bidding schedule, of sidewalk ramp constructed, including detectable warning strip. 908- 5 Basis of Payment: The accepted quantities of concrete single curb, curb and gutter, valley gutter, sidewalk, and driveway, measured as provided above, will be paid for at the contract unit price per linear foot or square foot, which price shall be full compensation for the work, com plete in place, including furnishing and placing embankment material, excavating, removing unstable material, backfilling and compacting. The accepted quantities of sidewalk ramps, measured as provided above, will be paid for at the contract unit price eac h, or per square foot, which price shall be full compensation for the work, complete in place, including furnishing and placing embankment material, excavating, removing unsuitable material, backfilling and compacting, surface finishing, and furnishing and installing the detectable warning strip. No separate measurement or payment will be made for the ramp curb along the back edge or side of sidewalk ramps, nor for the detectable warning strip, the costs being considered as included in the price of contract items. No separate payment will be made for the curb along the back edge of sidewalk connecting sidewalk ramps at an intersection, the cost being considered as included in the price of contract items. 909- 1 Description: The work under this section shall consist of furnishing all materials and installing concrete monuments, including cast iron frames and covers; furnishing cast iron frames and covers; or removing and resetting existing frames and covers at the locations shown on the project plans and in accordance with the details shown on the plans and the requirements of these specifications. 909- 2 Materials: 909- 2.01 Concrete: Concrete shal l be utility concrete conforming to the requirements of Section 922 of the specifications. The standard marker cap will be furnished by the Department. Section line marker caps shall be furnished by the contractor, and shall be stamped in accordance with Manual of Surveying Instructions 1973, published by the Department of Interior, Bureau of Land Management. Survey monuments shall be magnetically detectable. TABLE OF CONTENTS INDEX 1055 909- 2.02 Frames and Covers: Frames and covers shall conform to the requirements of Subsection 1004- 6 of the specifications for gray iron castings. The bearing face of the frame shall be machined so that the cover will lie flat in any position in the ring and have a uniform bearing throughout its entire circumference. Before leaving the foundry, the frames and covers shall be thoroughly cleaned. 909- 3 Construction Requirements: 909- 3.01 Survey Monuments: Excavation for new monuments shall be the depths designated on the plans. The monuments shall be backfilled with suitable material tam ped into place to provide a stable and secure installation. The concrete base, cast iron frame, bituminous mix and cover shall then be placed as detailed on the plans. The frame and cover shall be installed in a manner similar to that required under Subsection 505- 3.01 of the specifications. 909- 3.02 Frames and Covers: New frames and covers shall be installed as specified under Subsection 909- 3.01 of the specifications. 909- 3.03 Reset Frames and Covers: Existing frames and covers to be reset shall be carefully removed and reset as specified under Subsection 909- 3.01 of the specifications; however, at the contractor's option and with approval of the Engineer, adjustable extension r ings conforming to the requirements of Subsection 505- 3.03 of the specifications may be used. Frames and covers broken or damaged in removing and resetting shall be replaced at no additional cost to the Department. 909- 4 Method of Measurement: Survey monuments will be measured as a unit for each survey monument, including frame and cover; for each frame and cover; or for each existing frame and cover removed and reset. 909- 5 Basis of Payment: The accepted quantities of survey monuments, frame and cover for survey monument and reset frame and cover for survey monument, measured as provided above, will be paid for at the contract unit price each, complete in place, including excavating and backfilling. TABLE OF CONTENTS INDEX 1056 SECTION 910 CONCRETE BARRIERS : 910- 1 Description: The work under this section shall consist of furnishing all materials and constructing Portland cement concrete barriers at the locations shown on the project plans and in accordance with the details shown on the plans and the requirements of these specifications. 910- 2 Materials: Unless otherwise shown on the plans, concrete shall be ClassS Portland cement concrete conforming to the requirements of Section 1006 of the specifications with a compressive strength of at least 4,000 pounds per square inch at 28 days. Reinforcing steel shall be in accordance with the requirements of Section 1003 of the specifications. Dowels shall be corrosion resistant coated dowel bars conforming to the requirements of AASHTO M 254, Type A. Grout for pressure grouting the joints of precast barrier shall conform to the requirements of Subsection 602- 2.03 of the specifications. Grout for the bedding of precast barrier shall conform to the requirements of Subsection 913- 2.01(D) of the specifications. Joint sealant barrier shall be latex sealing compound conforming to the requirements of ASTM C834, applied as recommended in ASTM C1193. 910- 3 Construction Requirements: 910- 3.01 General: Unless otherwise required by the project plans or Special Provisions, concrete barrier shall be constructed by any of the following methods or combinations thereof, at the contractor's option:
Concrete barriers shall present a smooth, uniform appearance in their final position, conforming to the horizontal and vertical lines shown on the project plans or ordered by the Engineer. When concrete barriers are to be constructed on recently completed bridges, the barriers shall be placed after falsework has been released TABLE OF CONTENTS INDEX 1057 and as long after superstructure construction as the progress of the work will permit, unless otherwise ordered by the Engineer. Concrete barriers and concrete barrier transitions which are constructed on bridge structures, approach slabs and anchor slabs shall be constructed by cast -in-place, fixed- form methods. Precast or slip- form methods will not be allowed. Where concrete barrier is not placed on pavement, the supporting material shall be shaped and finished in reasonably close conformity to the lines, grades and dimensions established by the Engineer or shown on the project plans. The material shall be compacted to at least 95 percent of the maximum density determined in accordance with the requirements of the applicable test methods of the ADOT Materials Testing Manual, as directed and approved by the Engineer. All exposed surfaces shall be given a Class II finish in accordance with the requirements of Subsection 601 -3.05 of the specifications. Curing of concrete shall be in accordance with the requirements of Subsection 1006- 6 of the specifications. Barrier markers shall be installed in acc ordance with the details shown on the plans. 910- 3.02 Cast -In-Place by Slip Form or Extrusion:
Concrete barriers constructed by using an extrusion machine or similar equipment shall be of well compacted, dense concrete. At the option of the contractor, concrete may be made with materials continuously batched by volume and mixed in a continuous mixe r in accordance with the requirements of ASTM C685, except that sampling, testing, and acceptance of the concrete will be in accordance with the requirements of Section 1006 of the specifications. The contractor may be required to furnish evidence of successful operation of the extrusion machine or other equipment. Slip form or extruded barrier will be considered not to require additional finishing if the surface meets the requirements of a Class II finish as described in Subsection 601- 3.05 of the specifications and the alignment is satisfactory. If the extruded barrier does not meet these requirements, operations shall be stopped until adjustments are made to the equipment or the concrete mix that will result in an acceptable product. Barrier that cannot be refinished to meet the specifications for a Class II finish shall be removed and replaced at the contractor ’s expense. Barrier that has unsatisfactory alignment and straightedge tolerance shall be penalized or replaced in accordance with these specifications. TABLE OF CONTENTS INDEX 1058 The concrete shall be vibrated, rammed, tamped or worked with suitable equipment until the concrete has been consolidated in order to eliminate voids such as honeycombed surfaces. Further, the equipment shall be operated under sufficient uniform restraint to the forward motion to produce the required consolidation. The concrete shall be of such consistency that after extrusion it will maintain the shape of the barrier without support. The grade for the top of the concrete barrier shal l be indicated by an offset guide line set by the contractor from survey marks established by the Engineer. The forming portion of the extrusion machine shall be readily adjustable vertically during the forward motion of the machine to conform to the pred etermined grade line. A grade line gauge or pointer shall be attached to the machine in such a manner that a continual comparison can be made between the barrier being placed and the established grade line as indicated by the offset guide line. In lieu of the above method for maintaining the barrier grade, the extrusion machine may be operated on rails or forms or on existing pavement.
the following tolerances to be accepted at 100 percent of the unit price bid per linear foot.
surface of the barrier, it shall not vary by more than 1/4 inch from the straightedge.
of the barrier, it shall not vary by more than 1/2 inch from the straightedge.
than that allowed in Section 401 of the specifications when placed adjacent to Portland Cement Concrete Pavement. All other barrier dimensions shall not deviate by more than 1/2 inch from plan alignment.
with the following tolerances to be accepted at 75 percent of the unit price bid per linear foot.
surface of the barrier, it shall not vary by more than 1/2 inch from the straightedge. TABLE OF CONTENTS INDEX 1059
face of the barrier, it shall not vary by more than 3/4 inch from the straightedge.
when placed adjacent to Portland Cement Concrete Pavement. All other barrier dimensions shall not deviate by more than 3/4 inch from plan's alignment. Those portions of the barrier not in compliance with the minimum requirements specified herein to be accepted at 75 percent of the unit price shall be removed and replaced at no additional cost to the Department. 910- 3.03 Cast -In-Place by Fixed Forms: Concrete barrier cast -in-place with fixed forms shall be constructed and cured in accordance with the requirements of Section 601 of the specifications. If new or like new metal or wood forms are used and it is apparent, after the forms are stripped, that special care has been taken to produce uniformly textured surfaces with pleasing appearance, the Engineer may waive the specified additional finishing to produce a Class II finish. The barrier shall be cast in sections of the length shown on the project plans and the edges of the joints between sections shall be rounded to a 1/4- inch radius. After the concrete has cured for seven days, the joint shall be filled to a depth of at least 1 inch with joint sealant. When a 10- foot long straightedge is placed on the top and along the faces of the barrier, the surface shall not vary more than 1/4 inch from the straightedge. 910- 3.04 Precast : Precast concrete barrier shall be cast in accordance with the requirements of Section 601 of the specifications. After precast barrier has been approved for use on the project, no additional concrete finishing will be required. Should the finish of precast barrier be marred or damaged as a result of transporting or handling, the Engineer may reject it or allow refinishing. If refinishing is allowed, the resulting surface shall be of uniform texture and appearance and shall match the adjoining sections. TABLE OF CONTENTS INDEX 1060 Each section of barrier shall be set on a layer of fresh and plastic grout at least 1 inch deep, so that grout is exuded for the full length on both sides of the base when the section is set to the true line and grade. After adjacent sections of barrier have been doweled and set firmly in final position, the joint between them shall be filled with joint sealant t o a depth of 1 inch, up both sides but not across the top. After the joint sealant has set firmly enough to withstand the grouting pressure, grout shall be forced into the pressure grout hole until it flows from the top of the joint. When a 10- foot long straightedge is placed on the top and along the faces of the barrier, the surface shall not vary more than 1/4 inch from the straightedge. 910- 4 Method of Measurement: Concrete barrier will be measured by the linear foot along the center line of its top sur face. The measurement of the total length of the concrete barrier will not include any part which is within a length as shown on the project plans as a guardrail transition, as an impact attenuator, or as part of the structure of a bridge and extending between the stations of the ends of the bridge wing walls on the same side of the roadway. Sections of concrete barrier that transition from one shape, or type, to another shape, or type, and concrete barrier for guardrail transition, shall be measured by the unit each of concrete barrier transition that is not part of a structure. 910- 5 Basis of Payment: The accepted quantities of concrete barrier, measured as provided above, will be paid for at the contract unit price per linear foot, complete in place. No measurement or direct payment will be made for any concrete barrier which is included as part of a bridge structure. Concrete barrier included as part of a bridge structure quantity will be paid for under the lump sum bridge item. No measurem ent or direct payment will be made for barrier markers, the cost being considered as included in the cost of the concrete barrier, paid either by the linear foot or as part of a structure. The accepted quantities of concrete barrier transition, measured as provided above, will be paid at the contract unit price per each, which price shall be full compensation for the work, complete in place, including excavation, backfill, caissons, structural concrete, reinforcing steel, anchors, anchor assemblies, and d owels. Guardrail attached to TABLE OF CONTENTS INDEX