Published by department of transportation

81-2.03 CONSTRUCTION

Install the target plates after the post is set in place.

After setting the post, fill any space around it with rock-free earth. Thoroughly tamp and water the fill material such that it holds the post securely in position.

Unless the surplus material is hazardous, uniformly spread it along the adjacent roadway where designated by the Engineer.

Before Contract acceptance, spot paint any exposed areas where the paint is damaged and clean any exposed areas that are soiled.

81-2.04 PAYMENT

81-3.01 GENERAL

81-3.01A Summary

81-3.01B Definitions

81-3.01C Submittals

81-3.01D Quality Assurance

81-3.02 MATERIALS

81-3.02A General

Pavement markers must be packaged in a way that prevents damage.

Each package must be marked with:

1. Manufacturer's name

2. Type

3. Color

5. Lot number

6. Date of manufacture
Protect pavement markers from moisture during shipment to the job site and when stored at the job site.

81-3.02B Nonreflective Pavement Markers

81-3.02B(1) General

The marker must be free from defects that affect adhesion, appearance, performance, or any combination thereof. The top, bottom, and sides of the marker must be free from objectionable marks or discoloration.

The top surface of the marker must be convex with a gradual change in curvature. The bottom surface must be flat within a 0.05-inch tolerance.

The bottom of the marker must have areas of integrally-formed protrusions or indentations. The protrusions must project approximately 0.04 inch from the bottom surface. The face of the protrusions must be parallel to the bottom of the marker.

81-3.02B(2) Plastic Nonreflective Pavement Markers

Types A and AY plastic nonreflective pavement markers must be polypropylene or ABS plastic and comply with the requirements shown in the following table:

Plastic Nonreflective Pavement Marker Requirements

Quality characteristic	Test method	Requirement
Luminance factor, Type A, white markers only, top surface (min)	California Test 669	75
Yellowness index, Type A, white markers only, top surface (max)		7
Type AY markers only. The chromaticity coordinates must be within a color box defined under California Test 669.		Pass
Compressive strength (min, lb)		1,500
Artificial weathering, 500 hours exposure, white markers only, yellowness index (max)		20

A plastic nonreflective pavement marker must not be coated with any substance that interferes with the adhesive bond.

81-3.02B(3) Ceramic Nonreflective Pavement Markers

A ceramic nonreflective pavement marker must comply with the requirements shown in the following table:

Ceramic Nonreflective Pavement Marker Requirements

Quality characteristic	Test method	Requirement
Bond strength (min, psi)	California Test 669	700
Glaze thickness (min, in)		0.007
Hardness (min, Moh)		6
Luminance factor, Type A markers only, glazed surface (min)		75
Yellowness index, Type A markers only, glazed surface (max)		7
Type AY markers only. The chromaticity coordinates must be within a color box defined under California Test 669.		Pass
Compressive strength (min, lb)		1,500
Water absorption (max, %)		2.0

81-3.02C Retroreflective Pavement Markers

The exterior surface of a retroreflective pavement marker must be smooth and contain 1 or 2 retroreflective faces of the specified color.

The base of the marker must be rough textured and free from gloss and substances that could reduce the adhesive bond. The base must be flat within a 0.05-inch tolerance.

A retroreflective pavement marker must comply with the requirements shown in the following table:

Retroreflective Pavement Marker Requirements

Quality characteristic	Test method	Requirement
Bond strength (min, psi)a	California Test 669	500
Compressive strength (min, lb)b		2,000
Compressive strength, recessed markers (min, lb)		1,200
Abrasion resistance, specific intensity minimum requirements after abrasion		Pass
Water soak resistance		No delamination of the body and lens system or loss of reflectance
Reflectance		Specific intensity
		Clear	Yellow	Red
0° incidence angle (min)		3.0	1.5	0.75
20° incidence angle (min)		1.2	0.60	0.30
1 year after placement		0.30	0.15	0.08

^aThe marker body or filler material must not fail before reaching 500 psi under the bond strength test.

^bThe marker must not deform more than 0.125 inch at a load of less than 2,000 lb, and delamination of the shell and filler material must not exceed 0.125 inch regardless of the compressive load required to break the marker.

81-3.02D Hot Melt Bituminous Adhesive

Standard hot melt bituminous adhesive must comply with the requirements shown in the following table:

Quality characteristic	Test method	Requirement
Penetration, 100 g, 5 seconds, 77 °F (dmm)	ASTM D5	10–20
Softening point (min, °F)	ASTM D36	200
Flash point, COC (min, °F)	ASTM D92	550
Filler content (percent by weight) (insoluble in 1,1,1 trichloroethane)	ASTM D2371	65–75
Brookfield thermosel viscosity, no. 27 spindle, 20 rpm, 400 °F (centipoise)	ASTM D4402	3,000–6,000

Flexible hot melt bituminous adhesive must comply with the requirements shown in the following table:

Quality characteristic	Test method	Requirement
Penetration, 100 g, 5 seconds, 77 °F (max, dmm)	ASTM D5	30
Softening point (min, °F)	ASTM D36	200
Ductility, 2 in/min, 77 °F (min, in)	ASTM D113	6
Ductility, 0.4 in/min, 39 °F (min, in)		2
Flexibility	California Test 440	No breaks or cracks
Brookfield thermosel viscosity, no. 27 spindle, 20 rpm, 375 °F (centipoise)	ASTM D4402	2,500–6,000
Bond strength to concrete (min, psi)	California Test 440	100
Bond strength to retroreflective pavement marker (min, psi)	California Test 440	120

The filler material must be Type PC, Grade III, calcium carbonate complying with ASTM D1199. The fineness of the filler material must comply with the gradation requirements shown in the following table:

Sieve size	Percentage passing
No. 100	100
No. 200	95
No. 325	75

81-3.02E Epoxy Adhesive

The epoxy adhesive must be either rapid set or standard set.

Directory: esc
esc -> Biblical Eschatology Presentation by: D. Paul Beck May 4, 2016 Ground Rules
esc -> Mikael Håfstrӧm Screenplay by Miles Chapman and Arnell Jesko
esc -> Escort affinity Program for Audi Club Members
esc -> Preliminary entry form pistol
esc -> Application form
esc -> Request from Asian and Pacific Training Centre for Information and
esc -> Constitution of the engineering student council university of maryland
esc -> Subdisciplines of Earth Science Geology; study of the earth

Download 6.74 Mb.

Share with your friends: