AASHTO TP 111-14

VIP专免

老杨树 2024-10-25 16 727.91KB 9 页 15星币

侵权投诉

Standard Method of Test for

Measuring Retroreflectivity of

Pavement Marking Materials Using

a Mobile Retroreflectivity Unit

AASHTO Designation: TP 111-141

American Association of State Highway and Transportation Officials

444 North Capitol Street N.W., Suite 249

Washington, D.C. 20001

TS-4c TP 111-1 AASHTO

Standard Method of Test for

Measuring Retroreflectivity of

Pavement Marking Materials Using

a Mobile Retroreflectivity Unit

AASHTO Designation: TP 111-141

1. SCOPE

1.1. This test method covers measurement of the retroreflective properties of dry, horizontal pavement

marking materials, using a Mobile (vehicle-mounted) Retroreflectivity Unit (MRU) operated at

posted roadway speeds at a prescribed geometry. The prescribed geometry corresponds to the

European Committee for Standardization (CEN) geometry and is the standard geometry adopted

by ASTM E1710.

1.2. This test method ensures that night-time visibility provided by pavement markings is adequate.

This applies to the measurement of the pavement marking retroreflectivity using mobile

instruments.

1.3. This test method does not purport to address all of the safety concerns, if any, associated with its

use. It is the responsibility of the user of this test method to establish appropriate safety and health

practices and determine the applicability of regulatory limitations prior to use.

2. REFERENCED DOCUMENTS

2.1. ASTM Standards:

 D4061, Standard Test Method for Retroreflectance of Horizontal Coatings

 D7585/D7585M, Standard Practice for Evaluating Retroreflective Pavement Markings Using

Portable Hand-Operated Instruments

 E284, Standard Terminology of Appearance

 E808, Standard Practice for Describing Retroreflection

 E1710, Standard Test Method for Measurement of Retroreflective Pavement Marking

Materials with CEN-Prescribed Geometry Using a Portable Retroreflectometer

2.2. Other Publications:

 Choubane, B., J. Sevearance, H. S. Lee, P. Upshaw, and J. Fletcher. “Repeatability and

Reproducibility of Mobile Retroreflectivity Units for Measurement of Pavement Markings.”

Transportation Research Record 2337, pp. 74–82. TRB, Washington, DC, 2013.

 Holzschuher, C., B. Choubane, J. Fletcher, J. Sevearance, and H. S. Lee. “Repeatability of

Mobile Retroreflectivity Unit for Measurement of Pavement Markings.” Transportation

Research Record 2169, pp. 95–106, TRB, Washington, DC, 2010.

TS-4c TP 111-2 AASHTO

3. TERMINOLOGY

3.1. The definition of all the terms used in this document as well as other relevant terms can be found

in ASTM E284, ASTM E808, ASTM E1710, ASTM D7585/D7585M, and ASTM D4061. The

definitions listed below are direct excerpts from the above references for the terms that are most

relevant to the content of this document.

3.2. Definitions:

3.2.1. retroreflection—a reflection in which the reflected rays are returned preferentially in directions

close to the opposite of the direction of the incident rays, this property being maintained over wide

variations of the direction of the incident rays.

3.2.2. coefficient of retroreflected luminance, RL—the ratio of the luminance of a projected surface to the

normal illuminance at the surface on a plane normal to the incident light, expressed in candelas per

square meter per lux (cd/m2/lux).

3.2.3. Discussion—The measurements are commonly expressed in units of millicandelas per square

meter per lux (mcd/m2/lux) because pavement markings have a relatively low luminance

spectrum.

4. APPARATUS

4.1. Field Test Apparatus—The required field test apparatus consists of a vehicle equipped with the

following devices:

4.1.1. Retroreflectometer—One or more retroreflectometers mounted on either side of the host vehicle.

4.1.1.1. The retroreflectometer must be capable of collecting data in accordance to the 30-m geometry

conforming to ASTM E1710. See Section 5.1 for more information regarding the 30-m geometry.

4.1.1.2. The retroreflectometer must be capable of collecting pavement marking data while accounting for

the horizontal wander and vertical movement of the host vehicle.

4.1.1.3. The equipment must be capable of measuring retroreflectivity of pavement markings ranging from

75 to 1200 mcd/m2/lux.

4.1.2. Distance Measuring Instrument (DMI)—a distance measuring instrument with an accuracy of

±0.1 percent per mile.

4.1.3. Global Positioning System (GPS)—a Global Positioning System with an instantaneous horizontal

positioning accuracy of 10 ft or better (optional).

4.1.4. Data Acquisition System—a ruggedized computer system for data entry, acquisition, display, and

storage

4.1.5. Event Marker—In addition to a manual triggering system, an automated system should be

provided that detects a reference mark to start, stop, and event mark points of interest during the

measurement process, such as bridges, intersections, horizontal and vertical curves, etc.

文档加载中……请稍候！
如果长时间未打开，您也可以点击刷新试试。

下载文档到电脑，查找使用更方便

亲，本站95%以上的标准规范都面向会员免费，办理VIP会员下载更省钱，平均每篇不到2元

立即下载 VIP免费下载

摘要：

AASHTO TP 111-14 是美国国家公路与运输协会（AASHTO）发布的标准测试方法，全称为“Standard Method of Test for Determining the Asphalt Binder’s Resistance to Damage from Moisture and Freeze-Thaw Using the Modified Tensile Strength Test”。该标准通过改进的拉伸强度试验评估沥青结合料在水损害和冻融循环条件下的抗损坏能力，是道路材料

展开>> 收起<<

AASHTO TP 111-14.pdf

共9页,预览4页

还剩页未读，继续阅读

声明：本文档系会员上传，若文档所含内容侵犯了您的版权或隐私，请立即通知，我们立即给予侵权申诉删除！

AASHTO TP 111-14

相关推荐

开通VIP享超值会员特权

相关内容

热门标签

举报选择: