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PMA POLYMER MODIFIED ASPHALT
Paolo Visconti Iterchimica srl
PMA Polymer Modified Asphalt has been used from a long time to
provide higer performances to bituminous mixes
Actually two possibilities are available to
manufacture PMA: • PmB Polymer modified Bitumen A pre-blend of bitumen and polymer ITERFLEX system • Direct hot mix modification SUPERPLAST system • Through addition of polymers into the plant pug mill
ITERCHIMICA, thanks to its long term experience and its technical staff, is available to provide the necessary support to guide the
customers to chose the best solution in accordance with the
specifications
Roads are subjected to several distresses; mostly due to heavy traffic, poor binders properties, weathering and bad mix designs. This is the reason why the need to improve pavement properties
How can roads performances be
improved?
Technological features
By incrising the physical caractherisics
of the asphalt mixes
Technological features
What is a special pavement made of?
ITERFLEX SYSTEM
coarse aggregate
SBS polymer
bitumen
adhesion promoter
filler
PmB Polymer modified
Bitumen
SUPERPLAST SYSTEM
coarse aggregate
Superplast polymer
bitumen
Adhesion
promoter
filler
Which are the functions of polymers into a hot
mix?
physical modification
PMA applications
The main applications for PMA are: •Thin layer asphalt of various thicknesses •SMA (Stone Mastic Asphalt) •Porous asphalt (open structure) to improve the comfort for drivers and population, noise reduction of 2 to 3 dB (A) between 250 and 500 Hz and 5 to 9 dB (A) between 800 and 5000 Hz can be achieved •Rut and crack resistant top layers for durable low maintenance pavements •SAM (Stress Absorbing Membranes) and SAMI (Stress Absorbing Membrane Interlayer) •Airport runway surfacing for high performance and cost-effective maintenance •Sealant for bridges and viaducts, providing the necessary adhesion elasticity to absorb movement •Tack coat layers providing excellent adhesive and cohesive properties
Polymers
Which technology has to be preferred, between Pmb (Iterflex System) and direct addition (Superplast System), then? In accordance to the specifications performance tests, both of the technologies can fulfil the requirements. An appropriate laboratory study will easily indicate which solution can be the most appropriate in each different mix design case, showing the client all advantages and disadvantages of the application.
Polymers Every polymer type gives bitumen special chemical and physical properties. Specifications or the performance requirements of the asphalt mixes dictate which polymer should be used. Polymers can be added to bitumen ‘directly’, using special equipment (PmB plants) that ensures their perfect blending in the bitumen; or ‘indirectly’ by the addition into the mixer of the hot mix plant trough special dosing devices Polymers are devided in: ELASTOMER: mostly •SBS (styrene butadiene styrene) PLASTOMER: •EVA (ethyl vinyl acetate) •LDPE (low density polyethylene)
’.
Polymers
More precisely, the purpose of using polymers is improving the following properties:
RING AND BALL SOFTENING POINT FRAASS BREAKING POINT
DUCTILITY ELASTIC RECOVERY
VISCOSITY LESS SUSCEPTIBILITY TO THE TEMPERATURE
LOWER PENETRATION
ITERFLEX System
BITUMEN MODIFICATION TECHNOLOGY
Iterflex
ITERFLEX BITUMEN MODIFICATION
TECHNOLOGY Iterflex is a combination of two different products, a thermoplastic polymer Iterprene SBS and a bitumen stabilizer Iterfort PH 20, which guarantees the best performances of the PMB, acting on the inversion of phase and on the stability of the modified bitumen in the time. Since its introduction, ITERFLEX has proved its value in practice in terms of: Performance Durability Cost effectiveness
Iterflex
Iterflex
Values ASTM Unit Typical Value
Ring & Ball, softening temperature D 36-76 °C > 85
Fraass breaking temperature IP 80/53 °C < -15 Elastic recovery En 13398 % > 90 Viscosity at 135 °C D 2170-81 Pa.s > 1.5 Penetration at 25°C D 5-75 0.1
mm >= 50
B 70/100 pen plus 5% of Iterprene SBS and cross linking agent Iterfort PH20
Polymers
Or according to the PG grade specifications issued by SHRP program:
R&B versus SBS dosage
Pen. versus SBS dosage
The following diagrams are showing the changes of the physic characteristics of a bitumen B 70/100 related to the increase of the SBS content
ITERFLEX – Production process
ITERFLEX production requires a special plant with proper mill unit. An High shear mixer grinds the polymer while immersed in the bitumen. The polymer is mixed into the bitumen and passed through the high shear mixer, to cut the particles into small pieces. The size of the pieces is influenced by the gap width between the stator and the rotor
High Shear mixer
The addition of the cross-linking agent, ITERFORT PH20, ENSURES a perfect inversion of
phase, guaranteeing stability to the PmB:
ITERFLEX – Production process
High Shear mixer PmB plant
ITERFLEX – Lab tests
Asphalt Binders Bending Beam Rheometer Dynamic Shear Rheometer Pressure Aging Vessel Flash Point Penetration Ductility Softening Point Thin-Film Oven Test Kinematic Viscosity Capillary Viscosity Specific Gravity Rotational Viscosity Rolling Thin Film Oven Test Hot Mix Asphalt Concrete Gyratory Compaction Rotovapor Recovery Percent Air Voids Mechanical Analysis of Extracted Aggregate Quantitative Extraction Bulk Specific Gravity of SSD Mix Abson Recovery Maximum Theoretical Specific Gravity Marshall Stability and Flow Bulk Specific Gravity of Paraffin Coated Specimens Moisture Sensitivity
AASHTO/ASTM TP1 TP5 PP1 T48/D92 T49/D5 T51/D113 T53/D36 T179/D1754 T201/D2170 T202/D2171 T228/D70 TP48/D4402 T240/D2872 TP4 D5404 T269/D3203 T30/D5444 T164/D2172 T166/D2726 T170/D1856 T209/D2041 T245/D1559 T275/D1188 T283/D4867
SUPERPLAST
System
ASPHALT MIX MODIFICATION TECHNOLOGY
SUPERPLAST
How the modification occurs into the pug mill with the addition of
SUPERPLAST?
• Addition of the aggregate @ 170-175°C • The dosing device is injecting the Superplast
at the same time as aggregates enter the mixer • No extra mixing time is required! • Lay down and mixture compaction should be
executed in accordance with the same process and with the same equipments used in the traditional mixes
•SUPERPLAST will start melting @ 150°C (melting point) and get dispersed into the mixture thanks to pug mill paddles •Bitumen acts as dispersand fluid and helps to homegenize the polymer into the mix
Superplast into the bitumen
Microscope photo
Superplast bitumen modification can be easily checked performing laboratory test on the binder residue, such as: •Softening point •Penetration •Viscosity •Fraass point
Superplast certifications
Superplast certifications
Superplast certifications
BECHTEL ENKA GP Kosovo Motorway Project Wearing Course SMA 16
BECHTEL ENKA GP Kosovo Motorway Project Wearing Course SMA 16
BECHTEL ENKA GP Kosovo Motorway
Project Wearing Course SMA
16
BECHTEL ENKA GP Kosovo Motorway Project Wearing Course SMA 16
BECHTEL ENKA GP Kosovo Motorway
Project Wearing Course SMA
16
BECHTEL ENKA GP Kosovo Motorway Project Wearing Course SMA 16
BECHTEL ENKA GP Kosovo Motorway
Project Wearing Course SMA
16
BECHTEL ENKA GP Kosovo Motorway Project Wearing Course SMA 16
MAPA Construction Trading & Industry Co.
Libya Branch Costal Road Rasjedir-Sabrata
Libya Wearing Course
MAPA Construction Trading & Industry Co.
Libya Branch Costal Road Rasjedir-Sabrata
Libya Wearing Course
MAPA Construction Trading & Industry Co.
Libya Branch Costal Road Rasjedir-Sabrata
Libya Wearing Course
MAPA Construction Trading & Industry Co.
Libya Branch Costal Road Rasjedir-Sabrata
Libya Wearing Course
MAPA Construction Trading & Industry Co.
Libya Branch Costal Road Rasjedir-
Sabrata Libya Wearing Course
ASTALDI Spa Rehabilitation DN 79
ARAD-ORADEA - Romania Wearing Course MASF 16m
ASTALDI Spa Rehabilitation DN 79
ARAD-ORADEA - Romania Wearing Course MASF 16m
ASTALDI Spa Rehabilitation DN 79
ARAD-ORADEA - Romania
Wearing Course MASF 16m
TODINI Costruzioni Generali Spa Kiev-Chop Highway 2009 project Job Mix Formula SMA-15 Superplast: 5% on bitumen Fiber C-Plus: 0,3% on mixture Iterlene In/400S: 0,3% on bitumen
Astaldi Giugno 2005
ASTALDI-EL SALVADOR Summer 2005
150.000 m2
REPORT ON THE USE OF PMB FOR THE THE
PERFORMANCES IMPROVEMENT OFA WEARING COURSE, COMPARED WITH A TRADIDIONAL APPLICATION
Astaldi Giugno 2005
Mixes Marshall
Stability Kg Flow mm
Stability/flow Kgf/mm
Air Voids %
70/100 Neat bitumen
1780 3,69 490 8,26
6% of Superplast 2021 3,17 636 8,27
5% of Superplast 1903 3,36 570 8,89
5% of Iterprene SBS 1965 2,83 700 8,85
SUPERPLAST References Until 2011, 19million m2 have been
successfully applied worldwide
Thank you!