Art. 636.04 Concrete Barrier End anchor arrangements shall be constructed at the ends of cable road guard. Dead end anchor arrangement shall be used when cable road guard is placed adjacent to a bridge or when conditions will not permit placing the post anchor beyond the end post. When the length of the cable road guard is more than 500 ft (150 m), intermediate anchor arrangements shall be constructed at intervals not exceeding 500 ft (150 m). Cable splices will be permitted provided that no single piece of unspliced cable is less than 50 ft (15 m). The cable shall be tensioned to the satisfaction of the Engineer.
636.04 Method of Measurement. Cable road guard will be measured for
payment in feet (meters) in place from center to center of end posts.
636.05 Basis of Payment. This work will be paid for at the contract unit price
per foot (meter) for CABLE ROAD GUARD, SINGLE STRAND. SECTION 637. CONCRETE BARRIER
637.01 Description. This work shall consist of constructing a concrete barrier
and its base.
637.02 Materials. Materials for the barrier and a portland cement concrete
base shall be according to the following. Item Article/Section
a.Portland Cement Concrete ..................................................................... 1020
b.Hook Bars .......................................................................................... 1006.10
c.Dowel Bars .................................................................................... 1006.11(b)
d.Protective Coat ....................................................................................... 1023
e.Nonshrink Grout ................................................................................. 1024.02
f.Chemical Adhesive Resin System ...................................................... 1027.01
g.Preformed Expansion Joint Fillers .......................................................... 1051 Materials for a hot-mix asphalt (HMA) base shall be according to Section 1030.
637.03 Equipment. Equipment shall be according to the following.
Item Article/Section
a.Hand Vibrator ................................................................................ 1103.17(a)
b.10 ft (3 m) Straightedge ................................................................. 1103.17(h) Equipment for a portland cement concrete base shall be according to
Article 483 — 03.
Equipment for an HMA base shall be according to Article 356.03. CONSTRUCTION REQUIREMENTS Concrete Barrier Art. 637.09
637.04 Barrier Base. The base may be constructed separately or poured
monolithically with the barrier. When constructed separately, a portland cement concrete base shall be constructed according to Articles 483.04 and 483.05, except the surface shall be finished according to Article 503.15(a). An HMA base shall be constructed according to Articles 356.04 and 356.05.
637.05 Anchoring. Barrier shall be anchored to the base by the methods
shown on the plans. When hook bars are used, they shall be installed in preformed or drilled holes with a nonshrink grout or chemical adhesive.
637.06 Barrier Construction. Concrete barrier shall be constructed
according to the applicable portions of Articles 503.06 and 503.07. Where the horizontal alignment of the concrete barrier is curved, the barrier shall be constructed either on the curved alignment or on cords, a maximum of 10 ft (3 m) in length. When slipformed, the vertical centerline of the barrier shall not vary from the proposed centerline by more than 3 in. (75 mm) nor by more than 1/2 in. in 10 ft (13 mm in 3 m). All surfaces shall be checked with a 10 ft (3 m) straightedge as the concrete exits the slipform mold. Surface irregularities greater than 3/8 in. in 10 ft (10 mm in 3 m) shall be corrected immediately. Continued variations in the barrier surface exceeding 1/4 in. in 10 ft (6 mm in 3 m) will not be permitted and remedial action shall be taken immediately. Any deformations or bulges remaining after the initial set shall be removed by grinding after the concrete has hardened.
637.07 Barrier Transitions. Transitions between barriers of different design
shall be constructed according to the details shown on the plans.
637.08 Joints. Joints shall be constructed as shown on the plans and as
follows.
a.Construction Joints. Construction joints shall be constructed in the barrier whenever there is an interruption in the pour of more than 30 minutes.
b.Expansion Joints. Expansion joints shall be constructed in the barrier and the base in line with expansion joints in the adjacent pavement or shoulder. Expansion joints shall also be constructed at locations where the barrier abuts a rigid structure. Prior to placing concrete, a light coating of oil shall be uniformly applied to the dowel bars.
c.Contraction Joints. Contraction joints shall be constructed in the barrier at uniform intervals with a maximum spacing of 20 ft (6 m) or in line with contraction joints in the adjacent pavement or shoulder. Contraction joints shall be formed by a groove 1/8 in. (3 mm) wide by 2 in. (50 mm) deep either formed in the plastic concrete or sawed after the concrete has set.
637.09 Finishing. The surface of concrete barrier shall be finished according
to Article 503.15, except all holes and honeycombs shall be patched immediately. Art. 637.10 Glare Screen
637.10 Protective Coat. When required, protective coat shall be applied to
the top and vertical surfaces of the barrier exposed to traffic. The protective coat shall be constructed according to Article 420.18.
637.11 Method of Measurement. This work will be measured as follows.
a.Contract Quantities. The requirements for the use of contract quantities shall be according to Article 202.07(a).
b.Measured Quantities. New barrier base, both separate and monolithic, will be measured for payment in feet (meters) in place, along the centerline of the base or barrier. The width of the base will be defined as the width of the barrier. Concrete barrier will be measured for payment in feet (meters) in place, along the centerline of the barrier. Barrier transitions will be measured for payment in feet (meters) in place, along the centerline of the transition. Protective coat will be measured for payment in place and the area computed in square yards (square meters).
637.12 Basis of Payment. This work will be paid for at the contract unit price
per foot (meter) for CONCRETE BARRIER BASE; CONCRETE BARRIER, DOUBLE FACE, of the height specified; CONCRETE BARRIER, SINGLE FACE, of the height specified; and CONCRETE BARRIER TRANSITION. When a double face concrete barrier with a variable cross-section is required, and the variation exceeds 3 in. (75 mm), the barrier will be paid for at the contract unit price per foot (meter) for CONCRETE BARRIER, VARIABLE CROSS-SECTION, of the height specified. Protective coat will be paid for according to Article 420.20. SECTION 638. GLARE SCREEN
638.01 Description. This work shall consist of furnishing and constructing
permanent glare screens, consisting of concrete glare screens or a modular glare screen system, mounted on concrete medians; or furnishing, installing, maintaining, and removing a temporary modular glare screen system on top of temporary concrete barriers.
638.02 Materials. Materials shall be according to the following.
Item Article/Section
a.Portland Cement Concrete (Note 1) ....................................................... 1020
b.Reinforcement Bars ........................................................................... 1006.10
c.Modular Glare Screen System ................................................................ 1085
d.Nonshrink Grout ................................................................................. 1024.02
e.Chemical Adhesive ................................................................................. 1027
Referenced in this section
Sections that cite this one
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 579–581 of 1,217. View official source ↗