(a) Cross-sections. (See Figures 1, 2 and 3, following the text of this chapter.) Testing of compaction and materials, when required by the city, will be provided by the contractor at no expense to the city. The contractor employ a testing firm having a registered engineer certifying the testing reports.
(b) Bituminous aggregate pavement with limestone base.
(1) Materials.
A. The subgrade
be properly compacted in accordance with MDOT 2020 Standard Specifications for Construction and shall be properly drained with tile underdrain, if required by the city. Following compaction, immediately prior to paving, the subgrade shall be fine graded with equipment utilizing a templated screed so that the exact crown and shape of the subgrade surface will be positively established. A final compaction by rolling shall immediately precede the limestone placement.
B. The limestone base material
be 23-A crushed and washed. The limestone shall be placed and graded to meet the required thickness, crown and slope. Compaction by rolling shall immediately precede the paving. A tolerance of one-half inch, plus or minus, will be allowed in the compacted limestone base. Modification of materials and/or procedures shall be as approved by the city.
C. A bituminous limestone bond coat must be applied between layers of base course, and between the base course and the surface course. The type of bond coat and rates of application will be as approved by the city.
D. A bituminous aggregate surface course must be according to § 4.00 of the MDOT 2020 Standard Specifications for Construction. Modifications of materials and/or procedures
be as approved by the city.
(2) Construction.
A. Each compacted limestone base course lift
be laid in a maximum of seven inches in thickness. (See cross-sections for total thickness requirement.) Each separate course thickness shall be as approved by the city. (See details for additional specifications.)
B. The base course pavement material must be according to § 4.00 of the MDOT 2020 Standard Specifications for Construction laid at a compacted minimum uniform depth of three inches. (Greater thicknesses are required for some uses.) A tolerance of one-half inch, plus or minus, will be allowed in the compacted bituminous aggregate base course. Modification of materials and/or procedures
be as approved by the city.
C. The bituminous wearing surface
be laid at a uniform minimum thickness of one and one-half inches. However, a tolerance of one-eighth of an inch, plus or minus, will be allowed. (Greater thicknesses are required in some uses.) The bituminous pavement shall be laid with equipment utilizing automatic screed controls, unless otherwise directed by the city. (See details for additional specifications.)
D. Each stage of construction
be approved by the city’s DPW before proceeding with the next stage.
(c) Bituminous aggregate pavement with semirigid bituminous base.
(1) Materials.
A. The subgrade
be properly compacted in accordance with MDOT 2020 Standard Specifications for Construction and shall be properly drained with tile underdrain, if required by the city. Following compaction, immediately prior to paving, the subgrade shall be fine graded with equipment utilizing a templated screed so that the exact crown and shape of the subgrade surface will be positively established. A final compaction by rolling shall immediately precede the paving.
B. The base course pavement material must be according to § 4.00 of the MDOT 2020 Standard Specifications for Construction laid at a compacted minimum uniform depth of seven and one-half inches. (Greater thicknesses are required for some uses.) The base course
be laid with lifts containing a maximum thickness of five inches. A tolerance of one-half inch, plus or minus, will be allowed in the compacted bituminous aggregate base course. Modification of materials and/or procedures shall be as approved by the city.
C. A bituminous bond coat must be applied between each layer of base course, and between the base course and the surface course. The type of bond coat and rates of application
be as approved by the city.
D. A bituminous aggregate surface course must be according to § 4.00 of the MDOT 2020 Standard Specifications for Construction. Modification of materials and/or procedures
be as approved by the city.
(2) Construction.
A. The compacted bituminous aggregate base
be laid in a minimum of two separate courses. Each separate course shall be of a thickness approved by the city. (See details for additional specifications.)
B. The bituminous wearing surface
be laid at a uniform minimum thickness of one and one-half inches. However, a tolerance of one-eighth of an inch, plus or minus, will be allowed. (Greater thicknesses are required in some uses.) The bituminous pavement
be laid with equipment utilizing automatic screed controls, unless otherwise directed by the city. (See details for additional specifications.)
C. Each stage of construction
be approved by the city’s DPW before proceeding with the next stage.
(d) Concrete pavement.
(1) Materials.
A. The concrete
be 3,500 psi concrete according to MDOT 2020 Standard Specifications for Construction with a minimum thickness of six inches (reinforced). (See details for additional specifications.) The mix must be approved by the city’s DPW prior to placement.
B. Longitudinal lane joint tie bars
be mill bent steel deformed one-half inch round bars, held in place by mastic or metal chairs, or 16 inches long, one-half inch in diameter, joint dowel hook bolts fastened directly to the forms.
C. Transverse expansion joint basket assembly of approved standard plan will be required where directed.
(2) Construction.
A. The sub-base construction
be according to § 2.11 and tested in accordance with § 2.08 of the MDOT 2020 Standard Specifications for Construction.
B. The concrete construction
be according to § 4.14 of the MDOT 2020 Standard Specifications for Construction. However, that part of the prepared grade (roadbed) on which the concrete pavement is to be placed shall not be used for hauling purposes. A tolerance of one-fourth of an inch will be allowed in pavement thickness.
C. Where sawed joints are called for, their minimum depth
be one-fourth of the thickness of the concrete, and the maximum interval between transverse sawed joints shall be 20 feet, unless otherwise directed by the Engineer. Sawed joints shall be filled with an approved rubber base joint-sealing compound, preferably hot, in two applications performed at separate intervals as directed by the Engineer. All expansion and dummy joints in excess of one-eighth of an inch in width must be filled with hot poured rubber-base type joint-filling compound.
D. Each stage of construction must be approved by the city’s DPW before proceeding with the next stage.
(e) Soil cement base pavements. This type of pavement will not be allowed in the city for use on public streets. Any private constructed of this material not be accepted into the public system in the future.
(Res. passed 11-12-1986)