Additional Tests of Asphalt Mixture Characteristics

The previous deliberations on FPC use a basic level applied to the standard EN 13108-21 regarding tests of the mixture composition. Meanwhile methods of test­ing other properties of an asphalt mixture are discussed in Annex D (and are very informative). Collected results should be declared and used to support the procedure of extended validation of type testing.

The SMA mixture characteristics that are tested include the following:

• Content of air voids in compacted samples (% v/v) according to EN 12697-8

• Properties of the binder of RAP (only in case of recycled asphalt in an SMA paving mixture) according to EN 12697-4 and EN 12697-3

• Penetration at 25°C according to EN 1426

• Ring and ball (R&B) softening point according to EN 1427

Sampling and testing additional physical properties should be carried out at a frequency selected from the three levels A, B, and C:

Level A—testing every 10,000 tonnes Level B—testing every 5000 tonnes Level C—testing every 3000 tonnes

Selection criteria of the levels have not been determined in the standard. Test results should be stored in FPC files.

Some final remarks follow:

• Sampling of a mixture for additional tests should be conducted in accor­dance with EN 12697-27.

TABLE 14.3 The Comparison of Specification on SMA 10 or SMA 11 according to the rules of EN 13108-5 Germany Slovakia Sweden Poland Slovenia Austria TL-Asphalt Slovakia VVTBT WT-2 SIST ONORM В 2007 KLAZ 1/2008 Bitumenbundna lager. 2008:113 Nawierzchnie Asfaltowe 2008 13108- 5:2008 3584:2006 Designation SMA 11 S SMA 11 ABS 11 SMA 11 SMA 11 SMA 11 SI Thickness of layer, mm 35M0 30-50 24-44 35-50 35-40 30-40 Method of preparing samples Impact (Marshall) Impact (Marshall) Impact (Marshall) Impact (Marshall) Impact (Marshall) Impact (Marshall) Energy of compaction (strokes/side) 50 50 50 Gradation (% Mass of Passing by Sieve) 50 50 50 16.0 100 100 100 100 100 100 12.5 — — — — — — 11.2 90-100 90-100 90-100 90-100 90-100 90-100 10.0 — — — — — — 8.0 50-65 — 35-60 50-65 50-60 48-73 6.3 — — — — — — 5.6 35M5 — 35-45 — — 4.0 — 30-55 24-35 — 30-40 28M3 2.0 20-30 20-35 19-30 20-30 20-27 20-30 1.0 — — — — — — 0.5 — 11-25 12-24 — — 12-24 0.25 — — — — 10-16 — (‘Continued)

The Comparison of Specification on SMA 10 or SMA 11 according to the Rules of EN 13108-5

	Germany	Slovakia	Sweden	Poland	Slovenia	Austria
0.125	—	—	—	9-17	—	—
0.063	8-12	6-12	9-13	8-12	8-12	6-10
Minimum binder content, Bmin	6.6	6.4	6.0 for 50/70 and 70/100	6.0	6.3	6.2
Minimum void content, Vmin	2.5	2.5	2.0	3.0	2.5	2.0
Maximum void content, Vmax	3.0	4.5	3.5	4.0	4.5	4.0
Minimum void filled with binder,	Declared	74	NR	NR	74	NR
VFBmin
Maximum void filled with binder,		83	NR	NR	89	NR
VFBmax
Permitted binder drain-off	NR	0.3	NR	0.3	0.6	0.6
Resistance to abrasion by studded tires	NR	NR	NR	NR	NR	NR
Water sensitivity ITSR, %	NR	80	NR	90	NR	NR

TABLE 14.3 (CONTINUED)

Maximum proportional rut depth P	NR	NR	NR	NR	NR	NR
Maximum proportional rut depth, testing in air (PRDair)	Declared	5.0	NR	5.0	5.0	9.0
Maximum wheel tracking slope, testing in air (WTSair)	NR	0.1	NR	0.3	NR	NR

Resistance to Permanent Deformation

Source: Data from EN 13108-5. Bituminous Mixtures—Material specifications—Part 5: Stone Mastic Asphalt. Note: NR = no requirement; SMA = stone matrix asphalt.

• Samples should be prepared with the same method as applied for qualifica­tion tests of a mixture according to a formula (EN 13108-20); careful atten­tion should be paid to using the same method of compacting samples.

14.3 EXAMPLES OF REQUIREMENTS

For those interested in seeing how the CEN-member states have specified their national requirements for SMA, such a comparison is presented in Table 14.3.