HaTelit Presentation 2

1/28/2015

1

28.01.2015 1Unternehmenspräsentation

28.01.2015 1Partner Meeting Bali 2014


28.01.2015 1

Graham Thomson (Director),HUESKER Asia Pacific Pte Ltd, Singapore

Reinforcing Asphalt using High TenacityPolymeric Geogrids




28.01.2015 2

Content

• Basics• Current Situation• Repair Methods• Conventional Treatment

• Asphalt Reinforcement

• HaTelit C40/17• Installation• Interlayer Bonding• Dynamic Fatigue Testing

• Why Polyester as Asphalt Reinforcement?

• New Developments:• SamiGrid XP50S• HaTelit BL

• Conclusions & Benefits




28.01.2015 3

Asphalt Bearing course

Asphalt Binder course

Asphalt Surface course

• Ageing of the Bitumen• Temperature variations• Dynamic loads (traffic)

Crack development:

Asphalt pavement

Basics




28.01.2015 4

Asphalt Binder course

Asphalt Surface course

Asphalt Bearing course

OLD road construction

Asphalt pavement

Basics

1/28/2015

2




28.01.2015 5

Current situationCurrent Situation




28.01.2015 6

http://www.edmonton.ca

Filling Potholes

Repair methods




28.01.2015 7

Source: “http://www.thesurfacemasters.com”

Source: http://www.aplusasphaltandconcrete.com

Crack Sealing

Repair methods




28.01.2015 8

Milling… and the installation of a new asphalt layer

Conventional Treatment

http://www.edmonton.ca

http://www.thesurfacemasters.com

http://www.aplusasphaltandconcrete.com

1/28/2015

3




28.01.2015 9

Surface course

Conventionalrehabilitation

Bearing course

Binder course

After short time: Reflective cracks

MillingNew surface course

Conventional Treatment




28.01.2015 10

Surface course

Rehabilitationwith HaTelit®

Bearing course

Binder course

Lifetime of the pavement is significantly increased!

MillingNew surface course HaTelit®

Asphalt Reinforcement




28.01.2015 11

≥ 40 mm

Resurfacing, using full-areareinforcement

HaTelit®





28.01.2015 12

≥ 50 cm≥ 50 cm

≥ 40 mm

Reinforcement strips in road widenings

HaTelit®


1/28/2015

4




28.01.2015 13

≥ 50 cm≥ 50 cm

≥ 40 mm

Reinforcement of a paver joint / single cracks

HaTelit®





28.01.2015 14

≥ 40 mm

Reinforcement of an asphaltoverlay on concrete wearing

course

HaTelit®





28.01.2015 15

Purpose

• Extension of the service intervals

• Decrease of the maintenance costs

• Increase the service life of a road




28.01.2015 16

• Flexible reinforcement grid out ofhigh modulus Polyester with amesh size of 4 cm

• Ultralight non-woven serves asinstallation aid( Melting point PP at 150°C)

• Grid is heat resistant up to 200°C

• Grid and non-woven are bituminouscoated (excellent interlayer bonding)

What is HaTelit® C 40/17

HaTelit® C40/17

1/28/2015

5




28.01.2015 17

Installation of HaTelit®

1. Preparation of the surface

2. Spraying of bitumen emulsion

3. Applying / Unrolling HaTelit®

4. Asphalt installation

HaTelit® Installation




28.01.2015 18

Conditions for an optimum interlayer bond must be given.

HaTelit always has to be placed between twoasphalt layers (levelling asphalt layer)!

The base must be dry and clean

Large cracks and potholes have to be filled

Vertical movements must be corrected

Preparation of the surface





28.01.2015 19

Spraying the bitumen emulsion

When using:

- Emulsion with 70% Bitumen content: min. 0.6 kg/m²- Emulsion with 60% Bitumen content: min. 0.7 kg/m²

• On a milled, rough or opentextured surface theminimum rate needs to be further increased.

• On milled surfaces it can be up to 1.0 - 1.2 kg/m²(Using an emulsion with 70% Bitumen content)





28.01.2015 20

Applying / Unrolling HaTelit®

• The emulsion must be allowed to break

• Unrolling HaTelit® with a simple system,either manually, or mechanically

• HaTelit® must be placed free of foldsand wrinkles on the prepared surface

• In curves the grid can be cut an placedin parts


1/28/2015

6




28.01.2015 21

© HUESKER SyntheticGmbH

© HUESKER SyntheticGmbH

Overlaps must be treatedwith emulsion

min. 25 cmmin.15 cm

Cutting can simplybe done with a knife





28.01.2015 22

Covering with minimum40 mm asphalt layer

Asphalt installation should followthe HaTelit installation

without delay

Asphalt Installation





28.01.2015 23

Vehicles have to bemoved carefully!

The general local technicalguidelines for asphalt works

have to be followed





28.01.2015 24

Force-locked interlayer bonding at unreinforcedasphalt layers:

Friction

Interlocking

Adhesion

Interlayer Bonding

1/28/2015

7




28.01.2015 25

Interlayer Bonding

Friction

Adhesion

Inter-locking

Interlayer bonding with HaTelit®:

Force-locked interlayer bond!28.01.2015 26Unternehmenspräsentation



28.01.2015 26

AERONAUTICS TECHNOLOGICAL INSTITUTE

Tests to determine the effect of HaTelit®

in Anti Reflective Cracking applications

in Asphalt overlays[Dr. Guillermo Montestruque, 2000]

Dynamic fatigue tests




28.01.2015 27

• Material: HaTelit® C 40/17• Precrack: 3 mm, 6mm, 9 mm• HaTelit position: directly above the crack tip• Load position: Bending and shear mode• Contact pressure: 560 kN/m²

(1) Overlay(2) blocks with opening(3) Elastic base (rubber)

Research Dr. Guillermo Montestruque




28.01.2015 28

N=79,884

Typical crack(without reinforcement)


1/28/2015

8




28.01.2015 29

Typical crack(with HaTelit®)

N=503,832





28.01.2015 30

Bending modewithout HaTelit®





28.01.2015 31

Bending modewith HaTelit®





28.01.2015 32

Vf = Nf(with Hatelit) / Nf(without Hatelit)

“Improvement factor”

1

1

ff c

N =

( ) ( )CfFff NN

c21

1 +=

4.60 < Vf < 6.14

(B) (S)


1/28/2015

9




28.01.2015 33

WithoutHaTelit

WithHaTelit

FEM Simulation




28.01.2015 34

α-Concrete: ~1,3 × 10-3

α-Steel: ~1,0 × 10-3

α-Asphalt: ~6,0 × 10-4

α-Polyester: ~8,0 × 10-5

α-Asphalt: ~6,0 × 10-4

α-Glass-fibre: ~4,5 × 10-6

Ratio: ~ 1 / 1

Ratio: ~ 1 / 7

Ratio: ~ 1 / 133

Why Polyester?

Ratio of the coefficient of thermal expansion α [1/K]:

1. Coefficient of thermal expansion ofasphalt and Polyester are almost similar.




28.01.2015 35

Due to the flexibility it accommodatesto the surrounding asphalt!

Why Polyester?2. Polyester is flexible, so it accommodates

very well to the surrounding asphalt




28.01.2015 36

3. Polyester has a high resistance againstdamage during installation!

Why Polyester?

Laid reinforcement is always exposedto a great deal of stress!!

1/28/2015

10




28.01.2015 37

Conclusion:

The mechanical properties of Polyester matchvery well to the characteristics of asphalt!

This leads to:

Very low internal stresses Good bond of the material to the

surrounding asphalt Polyester does not act as a “foreign” material

Why Polyester?




28.01.2015 38

Airport Salgado Filho, Porto Alegre - Brazil

Reference: Monser C.A., Montestruque G.E., Silva A.E.F., (2010), Evaluation of anairport pavement after almost 8 years of overlay rehabilitation with a Polyestergeogrid asphalt reinforcement, 9th International Conference on Geosynthetics,Brazil.

Case Studies




28.01.2015 39

Background:

• In January 2002 the Taxiway of a commercialaircraft maintenance area had to be rehabilitated

• High traffic volume,e.g. Boeing 777 with a weight of 250 t

• Existing pavement was made of concrete slabs

Case Studies




28.01.2015 40

Existing pavement in January 2002

A possible rehabilitation method would have beenthe installation of thick new asphalt layers

Bearing courseConcrete slabs5.0m x 3.5m

25 cm

A plain asphalt layer cannot prevent the propagation(reflection) of the expansion joints

A thickness increase may delay reflective cracking,but is economically inefficient

BUT:

Case Studies

1/28/2015

11




28.01.2015 41

Bearing course

HaTelit® C 40/17

1. Injection / sealing of voids and expansion joints

2. Installation of an asphalt levelling course (20 mm)

3. Placing HaTelit® C 40/17

4. Installation of a 50 mm asphalt wearing course

Concrete slabs

Rehabilitation with HaTelit® C 40/17

However, only the middle (critical) part of the taxiway,where the planes taxi, had been reinforced.

Case Studies




28.01.2015 42

Condition after 8 years

HaTelit® C 40/17unreinforced

Shoulder

Case Studies




28.01.2015 43

unreinforced

HaTelit® C 40/17

Condition after 8 years

unreinforced

HaTelit® C 40/17

Case Studies




28.01.2015 44

• Very high traffic volume, mainly trucks

• Road condition: very bad− longitudinal and transverse cracks

• Design: Renewing the 5cm top asphalt layer

Ochtrup – Rosenstraße, GermanyPavement rehabilitation, 1996

Case Studies

After milling...

1/28/2015

12




28.01.2015 45

1. Installation of a complete new pavement,-> difficult to realize (time) and very expensive!

2. Application of a reinforcement to increase the periodof time until the next rehabilitation

Installation: 13.05.1996first survey: 15.05.2001last survey: August 2009

Possibilities for rehabilitation:

Case Studies




28.01.2015 46

1996

2001

2001

Case Studies




28.01.2015 47

Letter of reference, June 2002:

... Due to the installation of thereinforcement into the asphaltpavement, no cracks appearedat the surface until today .This procedure was chosen in thattime in order not to remove thecracked binder- and bearingcourse,...

Case Studies




28.01.2015 48

Despite a steadily high traffic volume...the pavement is still in an excellent condition!

2001

2005

April 2009

Case Studies

1/28/2015

13




28.01.2015 49

assessmentin August / September 2009

* TÜV Rheinland is a global leaderin independent testing andassessment services.

Case Studies




28.01.2015 50

Result:

Isolated cracks werefound, but just at the outsideedge of the pavement

Reason?

Case Studies




28.01.2015 51

10 - 20 cm

Result: No cracks were found in the reinforced areas

Case Studies




28.01.2015 52

HaTelit® ...• Reduces stress peaks over the tip of a crack and

therefore delays reflective cracking• Has a high resistance against installation damage• Improves the mechanical properties of the entire system• Also reduces the formation of ruts in areas with high

traffic due to the load-distribution effect

Conclusions & Benefits

Economical Benefits:• Longer life cycles• Reduction in maintenance costs• Cost-effective solution for rehabilitation

Environmental Benefits

• Savings in natural resources due toprolonged service intervals

Benefits of HaTelit®

Years of use

%ag

e D

eter

iora

tion

1/28/2015

14




28.01.2015 53

SamiGrid® XP 50 S

SamiGrid® XP 50 S

• Composite of PVA-Grid and 130 g/m2 non-woven

Bitumen saturated non-woven creates a SAMI

• Tensile strength of the grid: 50 kN/m The grid adds a reinforcing effect

• Has a bituminous finish on one side (interlayer bond)28.01.2015 54Unternehmenspräsentation



28.01.2015 54

• Special solution to be used directly on concrete(Therefore PVA as raw material)

• Can be used on ASR (Alkali-Silica Reaction)affected pavements

• Or, for example, when the installation of a levelling courseis not possible (height restrictions)

SamiGrid® XP 50 SApplication areas




28.01.2015 55

Please always considerthe detailed installationguidelines!

Installation




28.01.2015 56

Installation of SamiGrid®

1. Surface preparation

Installation

1/28/2015

15




28.01.2015 57


1. Surface preparation2. Spraying 1.8-2.3 kg/m²

of a polymer modifiedbitumen emulsion with70% bitumen content

Installation




28.01.2015 58


1. Surface preparation2. Spraying 1.8-2.3 kg/m² of

a polymer modifiedbitumen emulsion with70% bitumen content

3. Application of SamiGriddirectly into the freshemulsion

Installation




28.01.2015 59

Example: Bardowick, Mühlenstraße (Germany)

Case Study




28.01.2015 60

Covering with minimum40 mm asphalt layer

Asphalt installation canstart before the emulsionis completely broken!

Case Study

1/28/2015

16




28.01.2015 61

Schematic view of Thermal Cracking Test atBELGIUM ROAD RESEARCH CENTRE (BRRC, 2002)

Proof of effectiveness




28.01.2015 62




28.01.2015 63

South Dublin - Ireland

Case Study




28.01.2015 64

New Product: HaTelit® BL

HaTelit® BL?

Further development of HaTelit® C 40/17.

Self adhesive!

HaTelit® laminated to a bitumen sheet

Roll width: 1.0 m - Roll length: 15.0 m

Rehabilitation of asphalt/concrete pavements

Especially:- Targeted repair of single cracks- Targeted repair of paver joints (e.g. binder-binder)

Also ideal for small areas of up to around 500 m2

Application areas

1/28/2015

17




28.01.2015 65

HaTelit® BL

Installation HaTelit® BL

Place HaTelit® BL roll incorrect position for unrolling.




28.01.2015 66

HaTelit® BL


Peel off release film, … …and fold back under roll.

Apply exposed bitumen backing to base and press down.




28.01.2015 67

HaTelit® BL


Pull release film upwards andunroll HaTelit® BL in directionof laying while gently pulling.




28.01.2015 68

HaTelit® BL

At end of laying section, carefullycut off grid from roll with a knife.

1/28/2015

18




28.01.2015 69

HaTelit® BL

Benefits of HaTelit® BL

Active retardation of reflective cracking

Extension of pavement service life

Appreciable reduction in maintenance costs

Strong bond with asphalt due to bitumen contentof the grid > 60%

Reinforcing, stress-relieving and sealing function

HaTelit® boasts a long track record in the rehabilitationof asphalt pavements 28.01.2015 70Unternehmenspräsentation



28.01.2015 70

Thank you!

HaTelit® is a cost-saving and economically viablealternative to conventional construction solutions!

Documents

HaTelit Presentation 2