188_spondylidis_cokkinakis

1st IRF Europe & Central Asia Regional CongressIstanbul, September 15 - 18, 2015

Better Roads. Better World.

Athanassios SpondylidisArchitectex Vice Governor of Infrastructures, Region of Attica, Greece

New technologies for Road Safety & Maintenance:

S h o t b l a s t i n g

Terry CokkinakisElectrical - Mechanical EngineerPresident of T.Cokkinakis Ltd - Alimos, Greece


Better Roads. Better World.2

Presentation IndexCONTENT

1. Background and Introduction2. Shotblasting3. Main Benefits of Shotblasting4. Shotblasting Implementation 5. Evaluation of Results6. Conclusions



1. BACKGROUND AND INTRODUCTION

T. Cokkinakis LTD is mainly dealing with road safety works and materials since 40-45 years, such as: road markings – road studs (cat eyes) bridge joints – air port joints – crack joints – delineators and several other products and jobs.

Central offices in Athens – Greece, also working in Austria, Cyprus, Romania, Switzerland.



T.Cokkinakis Ltd & Shotblast Technology From 2010, T.Cokkinakis Ltd is dealing and make works in whole Europe on road

surfaces with the brand new technology of SHOTBLASTING. • T.Cokkinakis Ltd mainly applies Shotblasting in very dangerous spots on

roads (highways, motorways, state and municipal roads) presenting high slipperiness, with hundreds of accidents per year.



The revolutionary method of Shotblasting is a new technology process that enables roads to increase their non-slip characteristics, through increased roughness on the surfaces.

It is applied with a machine that "shoots" high speed steel balls on the pavement. Consequently, it creates a rough surface on the asphalt, greatly increasing the skid resistance (Retexturing).

Already, this method is widely applied in many countries in the world, with excellent results.

The revolutionary technology of Shotblasting, can increase the anti-slip characteristics of all road surfaces, including new ones.

2. SHOTBLASTING



3. MAIN BENEFITS of SHOTBLASTING

INCREASES ROAD SAFETY

REDUSING DRAMATICALYROAD ACCIDENTS

Economy of price / sq m, which is much lower compared to the conventional maintenance method - about 1/10 cheaper of new layer cost.

Productivity at 1,5km / h comes to benefits of 1.500 sq m / hour, about 10 - 15,000 sq m / day with only a single pass.




Free Traffic. During Shotblasting traffic is not disturbed but continued normally.

Environmentally friendly it does not pollute the environment. No fumes. No dust. Leaves behind a completely clean road.

A magnetic separator divides steel shots from the waste which is transferred to the rear of the truck in special "big-bags".




Increases macro and micro texture of the road pavement.

Prolongs life of the pavement for many

years without needing a new layer (5-6 years).

Removes the rubber on airport runways.

Erases the old road markings.



• HEAD BLASTRAC 2-45 D• SYSTEM OF PROGRESS Hydraulic• WORKING WIDTH 1150 mm• MAX SPEED 4,7 km/h• WEIGHT 1750 kg• DIMENSIONS 1250 x 1300 x 1300

mm• Suction system integrated, dust collection in "big-bags”

S H O T B L A S T I N G – T R U C K M A C H I N E S P E C I F I C AT I O N S



4. SHOTBLASTING IMPLEMENTATION

BEFORE AFTER



4. SHOTBLASTING IMPLEMENTATION

R E S U LT S C O N T R O L – 2 m a i n t e s t s

AMeasurement of pavement surface macro texture depth

using the volumetric sand-patch technique UNI EN 13036/1

B Test to determine sliding friction UNI EN 13036/4

With portable pendulum (British Pendulum Skid Friction Tester)



A. Measurement of pavement surface macro

texture depthusing the volumetric sand-patch technique

UNI EN 13036/1

The method requires spreading a certain volume of natural siliceous sand, clean and dry, with grain size between 0.160-0.315 mm, on the surface to be tested, so as to shape a maximum circular area. The ratio between the volume of the sand and the covered area, represents the average value of roughness (macro texture depth) expressed as the average sand patch diameter.

Macro texture is the void between the aggregate particles. It is the most important characteristic of the road surface roughness, which allows the water to drain away from surface and greatly contributes to skid resistance in wet conditions. Good texture depth is also necessary to allow mechanical deformation of the tyre (hysteresis) which absorbs kinetic energy.

Tip: GOOD MaCRO = HYSTERESIS = SAFETY



B. Test to determine sliding friction

UNI EN 13036/4 With portable pendulum

(British Pendulum Skid Friction Tester)

Defines the slipperiness of the road surface through the energy loss due to sliding of a moving rubber head mounted at the end of the pendulum.The pendulum is dropped from a horizontal position on the surface, previously wetted with water. Values are expressed in Skid Resistance Value (SRV)The test simulates slipping of a locked vehicle wheel, which travels with a speed of 50 km per hour on an asphalt road and in wet conditions.

Micro texture is the fine component of surface texture formed by the tiny interstices on the surface of the aggregate particles. It is the main contributor for providing grip or skid resistance to the tyre. Micro texture is measured by SRV.

Tip: GOOD MiCRO = GRIP = SAFETY



5. EVALUATION OF RESULTS

R E S U LT S o f - T. C o k k i n a k i s L t d w o r k i n g s i t e s 2 0 1 4

S k i d R e s i s t a n c e Va l u e sI m m e d i a t e l y a f t e r S h o t b l a s t i n g

Average Before 39 - After 86

SRV Increased 220%

C a s e 1 A t h e n s ( G r e e c e ) C i t y A v e n u e s

macro texture Depth Values



5. EVALUATION OF RESULTS

R E S U LT S o f T. C o k k i n a k i s L t d

w o r k i n g s i t e s 2 0 1 0

C a s e 2 R i n g R o a d o f A t h e n s

0.00

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

0.90

1.00

2.30 2.35 2.40 2.45 2.50 2.55 2.60 2.65 2.70 2.75 2.80

GN

Χ.Θ.

ΔΠΛΥ - ΤΜΗΜΑ Μ2,3-Μ2,8Λωρίδα 3

ΑΠΡΙΛΙΟΣ 2010

ΙΟΥΝΙΟΣ 2010

0.00

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

0.90

1.00

7.207.307.407.507.607.707.80

GN

Χ.Θ.

ΔΠΛΥ - ΤΜΗΜΑ Χ7,8-Χ7,2Λωρίδα 2

ΑΠΡΙΛΙΟΣ 2010

ΙΟΥΝΙΟΣ 2010

S k i d R e s i s t a n c e Va l u e s3 m o n t h s a f t e r S h o t b l a s t i n g

SRV Increased 76.5%



5. EVALUATION OF RESULTS C a s e 3 “ K o p i t a t u r n ” – P e l o p o n n e s e - H i g h w a y

Tr i p o l i s - S p a r t i

R E S U LT S o f T. C o k k i n a k i s L t d

w o r k i n g s i t e s 2 0 11 - 1 4

S k i d R e s i s t a n c e Va l u e s3 y e a r s a f t e r

Average Before 32 - After 61

SRV remains up to 90.5%



S H O T B L A S T & R O A D S A F E T YA C C I D E N T S B E F O R E / A F T E R S H O T B L A S T I N G

Case

1

2

3

AthensC i t y A v e n u e s

AFTER

2.92

15.5

2.58

0.05

2.50

Results attend Oct.2015

4 1.56

0.22

AthensR i n g R o a d H i g h w a y

Tr ipo l i sH i g h S p e e d R o a d

Thessa lon ik iR i n g R o a d

BEFORE

s o u r c e s : 1 . T r a f f i c P o l i c e C e r t i f i c a t e s

2 . M a i n t e n a n c e S e r v i c e s C e r t i f i c a t e s

R o a d A c c i d e n t s p e r M o n t h - S h o t b l a s t e d s i t e s

AFTERBEFORE

R e d u c t i o n R a t i o ( % ) A c c i d e n t s / M o n t h



CONCLUSIONS

Skid resistance is related in both micro and macro texture.

Shot blasting increase both these properties greatly. The combination of both properties brings the perfect result

Immediately after application of the method, there is an increase of total skid resistance factors, enormously up to 200% of the initial state.

After the first three months there is a decline from baseline (immediately after shot blasting values) up to 25% and after this time, a stabilization of prices for at least three years, with prices anyway to be far greater from the original state before application.

There is a strong and direct link of skid resistance and road safety. Good macro texture means hysteresis, good micro texture means grip. Both of them mean safety.

Shotblasting is the finest tool for the immediate resolution of the road safety issue and as so is very promising.



Thank you!from

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