188_spondylidis_cokkinakis

1st IRF Europe & Central Asia Regional Congress
Istanbul, September 15 - 18, 2015
Better Roads. Better World.
Athanassios Spondylidis
Architect
ex 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 Cokkinakis
Electrical - Mechanical Engineer
President of T.Cokkinakis Ltd - Alimos, Greece

Presentation Index
CONTENT
1. Background and Introduction
2. Shotblasting
3. Main Benefits of Shotblasting
4. Shotblasting Implementation
5. Evaluation of Results
6. Conclusions
2

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.
3

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.
4

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
5

3. MAIN BENEFITS of SHOTBLASTING
6
INCREASES ROAD SAFETY
REDUSING DRAMATICALY
ROAD 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.

7
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".

8
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.

9
• 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
10
B E F O R E AF T E R

11
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
A
Measurement 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)

12
A.
Measurement of pavement surface macro
texture depth
using 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

13
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
14
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 s
I 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 Av e n u e s
macro texture
Depth Values

15
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-Μ2,8
Λωρίδα 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-Χ7,2
Λωρίδα 2
ΑΠΡΙΛΙΟΣ 2010
ΙΟΥΝΙΟΣ 2010
3 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%

16
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
3 y e a r s a f t e r
Average Before 32 - After 61
SRV remains up to 90.5%

17
S H O T B L AS T & R O AD S AF E T Y
AC C I D E N T S B E F O R E / AF T E R S H O T B L AS T I N G
Case
1
2
3
At h e n s
C i t y A v e n u e s
AF T E R
2.92
15.5
2.58
0.05
2.50
Results attend
Oct.2015
4 1.56 0.22
At h e n s
R i n g R o a d H i g h w a y
Tr i p o l i s
H i g h S p e e d R o a d
T h e s s a l o n i k i
R i n g R o a d
B E F O R E
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 Ac 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
BEFORE
AFTER
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.
18

19
Thank you!
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