EN_TCVN 8864-2011

TCVN 8864 : 2011Standard Test Method for Measuring Road Pavement Surface Roughness Using a 3.0 m Straight Edge Foreword TCVN 8864: 2011 is changed from 22 TCN 16-79 under the provision o

TCVN 8864 : 2011

Standard Test Method for Measuring Road Pavement Surface Roughness Using a 3.0 m Straight

Edge

Foreword

TCVN 8864: 2011 is changed from 22 TCN 16-79 under the provision of paragraph 1 of Article 69

of the Law on Standards and Technical Regulations and point a of paragraph 1 of Article 7 of Decree No 127/2007/ND-CP dated 01 Aug 2008 of the Government detailing the implementation

of some articles of the Law on standards and technical regulations

TCVN 8864: 2011 complied by the Institute of Science and Technology Editor of Transportation,

proposed by Ministry of Transportation, announced by Directorate for Standards, Metrology and Quality Assessment, Ministry of Science and Technology

Standard Test Method for Measuring Road Pavement Surface Roughness Using a 3.0 m

Straight Edge

1 Application scope

1.1 This standard defines the sequence of measuring and evaluating road pavement surface roughness as well as surface of each layer structure (base and foundation) of road during construction and acceptance for each road pavement surface section by using 3.0 meter straight edge

1.2 This standard can be used to perform the acceptance for the surface roughness of each section or to evaluate the roughness of road surface during the exploitation process in the absence of a self-propelled roughness measuring mean

2 Test summary

At experiment location, place 3 m straight edge on road surface in a direction parallel or perpendicular to the axis of roadway Use a wedge to insert into the gap between road surface and the bottom of the straight edge at measuring points with interval of 50 cm from the beginning

of straight edge Identify gaps corresponding to the height of the wedge as a basis to examine and evaluate the roughness of road surface

3 Tool and instrument

3.1 Straight edge: usually made of stainless metal, 3.0 m long Ruler must be straight, lightweight, stiff enough not to be deformed during experiment, and marked with measuring points for measuring interval of 50 cm from the beginning of ruler (Figure 1)

3.2 Wedge: usually made of stainless metal and less abrasive, triangle marking with 6 height values: 3 mm, 5 mm, 7 mm, 10 mm, 15 mm and 20 mm for quickly reading gap value (mm) between road surface and the lower edge of straight edge 3 m (Figure 2)

Figure 2 - Wedge

3.3 Broom to wipe road surface, traffic guidance tools (billboards, guidance cone, )

4 Density Test

4.1 When checking and assessing the roughness during construction and acceptance: perform measurement in each lane, longitudinal direction of the road, minimum 0.6 m away from road edge or curb, with measuring density of 25 meters long / 1 location

4.2 When evaluating the roughness of old road surface under exploitation: perform measurement

in each lane, longitudinal direction within the scope of wheel vicious streak subsidence, with measuring density of 50 meters long / 1 location

4.3 In case of necessity, it can measure in the direction perpendicular to the road

5 Perfomance procedure

5.1 Check the straightness of ruler before every time of using Set up traffic guidance tools (billboards, guidance cones,…) at measurement location; use broom to clean road surface at location of roughness measurement

5.2 At each test location on road surface or on surface layer of material, place 3m straight edge parallel to the road Along the length of ruler, at measuring points with interval of 50 cm as determination by ruler, gently insert the wedge into the gap between the bottom edge of the ruler and road surface; Read the corresponding values Total gaps for each measurement is 7 Measurement results are recorded in accordance with the guidance in Appendix A

6 Criteria for roughness evaluation

6.1 Criteria for evaluation, testing and acceptance of roughness are defined in Table 1, and divided into three (3) levels: very good, good and moderate depending on layer location and material of such layer

6.2 When performing test and acceptance for road surface under construction or newly completed one, apply the following evaluation criteria:

- For highway, class I road and class II road: the roughness should be very good;

- For road of other classes: the roughness should be good;

NOTE 1:

For all road classes, it is allowable to have 5% of the gaps exceeding the biggest regulated gap value corresponding to the requirement roughness, but the biggest gap value shall not exceed 1.4 times as the corresponding regulated value

6.3 When evaluating the old road surface under exploitation, if the roughness at moderate level, the roughness may be considered to meet exploitation requirement

Table 1 - Criteria for roughness evaluation

Layer Material of layer Roughness level

Top layer and

flattened wearing

course

Asphalt concrete, cement concrete and small-sized granular mix

70% of the measured gaps not over 3 mm; the rest 30% not over

5 mm

50% of the measured gaps not over 3 mm; the rest not over 5 mm

100% of the measured gaps not over 5 mm

Base Asphalt concrete,black aggregate measured gaps not100% of the

over 5 mm

50% of the measured gaps not over 5 mm; ; the rest not over 7 mm

100% of the measured gaps not over 7 mm

Top layer or

flattened wearing

course

Penetration asphalt and bitinuous surface treatment

100% of the measured gaps not over 7 mm

70% of the measured gaps not over 7 mm; the rest not over 10 mm

50% of the measured gaps not over 7 mm; the rest not over 10 mm

Top foundation and

reinforced edge

(fixed edge)

Soil, reinforced rock; macadam aggregate, natural aggregate; Water bound macadam;

improved soil, filled

soil

100% of the measured gaps not over 10 mm

70% of the measured gaps not over 10 mm; the rest not over 15 mm

100% of the measured gaps not over 15 mm

Bottom foundation,

pavement base,

soil base, soil edge

100% of the measured gaps not over 15 mm

70% of the measured gaps not over 15 mm; the rest not over 20 mm

100% of the measured gaps not over 20 mm

7 Test Report

Test report should include the following information:

- The name of the road, station, the length of test section;

- Type road surface (foundation);

- Test date;

- Measurement results (see Appendix A);

- Tester and test facilities

APPENDIX A

(for reference)

Roughness measuring result by 3 m straight edge

- Road surface type: ………… - Station: From km…to Km……

- Climate at measurement:……… - Test date: …./…./20…

- Measurement results:

No Station

Measuring location Gap number between road

surface and 3 m straight edge, x

By road axle

Lane

No Right Left ParallelPerpendicularx ≤ 33 < x≤ 55 < x≤ 77 < x≤ 10

10 <

x ≤ 15

15 <

x ≤

20 > 20

1 Km 35+ 000

Lane

Lane

2 Km 35+ 025

Lane

Lane

Total Percentage (%)

Result: Roughness level:………

CONTENT

1 Application scope

2 Test summary

3 Tool and instrument

4 Density Test

5 Performance procedure

6 Criteria for roughness evaluation

7 Test Report

APPENDIX A (for reference): Roughness measuring result by 3 m straight edge