PMA POLYMER MODIFIED ASPHALT

Transcription

1 PMA POLYMER MODIFIED ASPHALT Paolo Visconti Iterchimica srl

2 PMA Polymer Modified Asphalt has been used from a long time to provide higer performances to bituminous mixes

3 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

4 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

5 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

6 How can roads performances be improved?

7 Technological features By incrising the physical caractherisics of the asphalt mixes

8 Technological features What is a special pavement made of?

9 coarse aggregate filler bitumen ITERFLEX SYSTEM PmB Polymer SBS polymer modified adhesion Bitumen promoter

10 coarse aggregate filler SUPERPLAST SYSTEM bitumen Superplast polymer Adhesion promoter

11 Which are the functions of polymers into a hot mix?

12 physical modification

13 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

14 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.

15 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).

16 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

17 ITERFLEX System BITUMEN MODIFICATION TECHNOLOGY

18 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

19 Iterflex

20 Iterflex B 70/100 pen plus 5% of Iterprene SBS and cross linking agent Iterfort PH20 Values ASTM Unit Typical Value Ring & Ball, softening temperature D C > 85 Fraass breaking temperature IP 80/53 C < -15 Elastic recovery En % > 90 Viscosity at 135 C D Pa.s > 1.5 Penetration at 25 C D mm >= 50

21 Or according to the PG grade specifications issued by SHRP program: Polymers

22 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 R&B versus SBS dosage Pen. versus SBS dosage

23 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

24 The addition of the cross-linking agent, ITERFORT PH20, ENSURES a perfect inversion of phase, guaranteeing stability to the PmB:

25 ITERFLEX Production process High Shear mixer PmB plant

26 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

27 SUPERPLAST System ASPHALT MIX MODIFICATION TECHNOLOGY

28 SUPERPLAST

29 How the modification occurs into the pug mill with the addition of SUPERPLAST?

30

31 Addition of the 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

32 SUPERPLAST will start 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

33 Superplast bitumen modification can be easily checked performing laboratory test on the binder residue, such as: Softening point Penetration Viscosity Fraass point

34 Superplast certifications

35 Superplast certifications

36 Superplast certifications

37 BECHTEL ENKA GP Kosovo Motorway Project Wearing Course SMA 16

38 BECHTEL ENKA GP Kosovo Motorway Project Wearing Course SMA 16

39 BECHTEL ENKA GP Kosovo Motorway Project Wearing Course SMA 16

40 BECHTEL ENKA GP Kosovo Motorway Project Wearing Course SMA 16

41 BECHTEL ENKA GP Kosovo Motorway Project Wearing Course SMA 16

42 BECHTEL ENKA GP Kosovo Motorway Project Wearing Course SMA 16

43 BECHTEL ENKA GP Kosovo Motorway Project Wearing Course SMA 16

44 BECHTEL ENKA GP Kosovo Motorway Project Wearing Course SMA 16

45 MAPA Construction Trading & Industry Co. Libya Branch Costal Road Rasjedir-Sabrata Libya Wearing Course

46 MAPA Construction Trading & Industry Co. Libya Branch Costal Road Rasjedir-Sabrata Libya Wearing Course

47 MAPA Construction Trading & Industry Co. Libya Branch Costal Road Rasjedir-Sabrata Libya Wearing Course

48 MAPA Construction Trading & Industry Co. Libya Branch Costal Road Rasjedir-Sabrata Libya Wearing Course

49 MAPA Construction Trading & Industry Co. Libya Branch Costal Road Rasjedir- Sabrata Libya Wearing Course

50 ASTALDI Spa Rehabilitation DN 79 ARAD-ORADEA - Romania Wearing Course MASF 16m

51 ASTALDI Spa Rehabilitation DN 79 ARAD-ORADEA - Romania Wearing Course MASF 16m

52 ASTALDI Spa Rehabilitation DN 79 ARAD-ORADEA - Romania Wearing Course MASF 16m

53 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

54 Astaldi Giugno 2005 ASTALDI-EL SALVADOR Summer m 2 REPORT ON THE USE OF PMB FOR THE THE PERFORMANCES IMPROVEMENT OFA WEARING COURSE, COMPARED WITH A TRADIDIONAL APPLICATION

55 Astaldi Giugno 2005 Mixes Marshall Stability Kg Flow mm Stability/flow Kgf/mm Air Voids % 70/100 Neat bitumen 6% of Superplast 5% of Superplast 5% of Iterprene SBS , , , , , , , ,85

56 SUPERPLAST References Until 2011, 19million m 2 have been successfully applied worldwide

57 Thank you!