Requirements for stabilizers

Specifying the desired properties of stabilizers is a troublesome task, which is why there are not very many examples of formalized requirements for them. In fact, detailed testing of a stabilizer’s properties is practically impossible in the asphalt plant laboratory. Therefore, in many countries, testing is limited to draindown check­ing (i. e., only an empirical assessment of stabilizer effectiveness).

A few examples of standardized regulations come from Germany and the United States. Some requirements were also in the Finnish specification PANK 2000.

5.3.1 Germany

The requirements adopted in Germany were cited in a 1997 document entitled

Testing and Marking Stabilizing Additives and Materials Applied for Bituminous

TABLE 5.7 POLAND SLOVAKIA GERMANY SWEDEN PN-EN 14023:2009/ Katalogove Listy TL-Bitumen 07 VV Publ 2008:113 AC2010 Asfaltov KLA 1/2009 Properties Test Method 25/55-55 40/100-75 45/80-55 45/80-55 Penetration at 25°C, 0.1 mm EN 1426 25-55 40-100 45-80 45-80 Softening point, °С EN 1427 >55 >75 >55 >55 Force ductility (low speed traction), J/cm2 EN 13589 EN 13703 >3 at 5°C TBR >3 at 5°C >2 at 5°C Change of mass, % EN 12607-1 <0.5 <0.5 <0.5 <0.5 Retained penetration after RTFOT, % EN 1426 >60 >60 >60 >60 Increase in softening point after RTFOT, °С EN 1427 <8 <10 <8 <12 Flash point, °С EN ISO 2592 >235 >220 >235 >250 Fraass breaking point, °С EN 12593 <-10 <-12 <-12 <-18 Elastic recovery at 25°C, % EN 13398 >50 — >50 >50 Elastic recovery at 10°C, % EN 13398 — >75 — — Plasticity range, °С p. 5.1.9 — TBR TBR — Storage stability EN 13399 <5 <5 <5 <5 Difference in softening point, °С EN 1427

Storage stability

Difference in penetration, 0.1 mm Drop in softening point after RTFOT, °С Elastic recovery at 25°C after RTFOT, %

Elastic recovery at 10°C after RTFOT, %

Note: TBR = To Be Reported.

TABLE 5.7 POLAND SLOVAKIA GERMANY SWEDEN PN-EN 14023:2009/ Katalogove Listy TL-Bitumen 07 VV Publ 2008:113 AC2010 Asfaltov KLA 1/2009 Properties Test Method 25/55-55 40/100-75 45/80-55 45/80-55 Penetration at 25°C, 0.1 mm EN 1426 25-55 40-100 45-80 45-80 Softening point, °С EN 1427 >55 >75 >55 >55 Force ductility (low speed traction), J/cm2 EN 13589 EN 13703 >3 at 5°C TBR >3 at 5°C >2 at 5°C Change of mass, % EN 12607-1 <0.5 <0.5 <0.5 <0.5 Retained penetration after RTFOT, % EN 1426 >60 >60 >60 >60 Increase in softening point after RTFOT, °С EN 1427 <8 <10 <8 <12 Flash point, °С EN ISO 2592 >235 >220 >235 >250 Fraass breaking point, °С EN 12593 <-10 <-12 <-12 <-18 Elastic recovery at 25°C, % EN 13398 >50 — >50 >50 Elastic recovery at 10°C, % EN 13398 — >75 — — Plasticity range, °С p. 5.1.9 — TBR TBR — Storage stability EN 13399 <5 <5 <5 <5 Difference in softening point, °С EN 1427   EN 13399
EN 1426
EN 12607-1, EN 1427	<2
EN 12607-1, EN 13398	>50

TBR <5

TBR >50

>50

№ vo

Surfaces (FGSV Arbeitpapier 42). It contains requirements for all kinds of stabiliz­ers used in aggregate mixtures with a high content of binder, which includes the following:

• Organic fibers

• Mineral fibers

• Powders and dusts

• Compounds of filler and all sorts of fibers

• Special fillers.

The range of testing depends on the type of stabilizer. The following is a set of recommended tests for fibers:

• Macroscopic assessment

• Homogeneity

• Color

• Odor

• Agglomeration (balling)

• Microscopic assessment

• Structure

• Other properties

• Gradation distribution

• Diameter—in specified cases

• Mass loss after drying

• Mass loss after ignition

• Specific gravity

• Water susceptibility

• Stiffening properties (an increase of the softening point after the Wilhelmi method)