effects of thermal load to the mechanical … · effects of thermal load to the mechanical...
TRANSCRIPT
EFFECTS OF THERMAL LOAD TO THE
MECHANICAL PROPERTIES OF POLYMER CONCRETE
ORSOLYA ILONA NÉMETH S U P E R V I S O R S : GYÖRGY F A R K A S ÉVA LUBLÓY
B U D A P E S T U N I V E R S I T Y O F T E C H N O L O G Y A N D
E C O N O M I C S D E P A R T M E N T O F S T R U C T U R A L E N G I N E E R I N G
9th fib International PhD symposium in Civil Engineering, July 22nd – July 25th 2012, Karlsruhe, Germany
Cement/polymer
2012.07.24.
Polymer concretes have good strength characteristics, dense structure, slight moisture absorption, high chemical and physical resistivity , rapid solidification.
NO water, NO cement!!!
Cement concrete
Portland cement
Water Aggregates
Admixtures
Polymer concrete
Polymer binder
Aggregates
Admixtures
9th fib International PhD Symposium in Civil Engineering
Material composition
2012.07.24.
Binder: POLIMAL 144-1 16w%
Catalyst: Trigonox 44B Initiator: Co-1 Cobalt
Quarz gravel 2-4 mm 38w%
Quarz sand 0-2 mm 38w%
Calcium-Carbonate 5w%
9th fib International PhD Symposium in Civil Engineering
Polymer concrete vs. temperature
2012.07.24.
Thanks to the polymer component, the mechanical properties and possible applications of polymer concretes are essentially influenced by the change of temperature and the load caused by fire.
In general, high temperature results degradation and finally, loss of strength of the polymers.
9th fib International PhD Symposium in Civil Engineering
The goal
2012.07.24.
Determine the behaviors of the polymer concrete of given composition under thermal load.
Defines the residual values of
compression strength
flexural strength
modulus of elasticity
after exposed high temperature.
9th fib International PhD Symposium in Civil Engineering
Derivatograph Q-1500 D
Preliminary experiment
Derivatographic measurement is a simultaneous thermo-analytical method which simultaneously produces thermo-gravimetric (TG), differential thermo-analysis (DTA) and derivative thermo-gravimetric ( DTG) signs from a small amount of the material.
2012.07.24. 9th fib International PhD Symposium in Civil Engineering
The process
2012.07.24.
A small amount of polymer concrete...
After crushing…
Put in the measurement equipment and ignite on high temperature
The changes in the mass of the sample (TG curve) were measured!
9th fib International PhD Symposium in Civil Engineering
Derivatogram of the UP polymer concrete
2012.07.24.
Thermo-gravimetric curve
Temperature
9th fib International PhD Symposium in Civil Engineering
400 °C !
During the 400°C heat load the specimens caught fire without any lighting effect and …
2012.07.24. 9th fib International PhD Symposium in Civil Engineering
…continued to burn freely until they got carbonized.
In the case of concrete with plastic binder, the burning of the plastic provides enough energy for the continuation of burning.
2012.07.24. 9th fib International PhD Symposium in Civil Engineering
Compression strength Flexural strength
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The specimens
150 x 150 x 150 mm cubes 3-3 pieces in all heat step
performed on the basis of the MSZ EN 12 390-3:2009 Standard
70 x 70 x 250 mm beams 3-3 pieces in all heat step
performed on the basis of the MSZ EN 12 390-5:2009 Standard
9th fib International PhD Symposium in Civil Engineering
The heat stages
During the tests, the polymer concrete specimens of given composition were subjected to load in four stages:
20°C,
100°C,
200°C,
300°C
Testing without any direct flame effect!
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100 °C 200 °C
300 °C
9th fib International PhD Symposium in Civil Engineering
Inner layer
The inner layer was not discoloured during the two-hour heat load
2012.07.24. 9th fib International PhD Symposium in Civil Engineering
Relative residual compression strength
2012.07.24.
0
0,2
0,4
0,6
0,8
1
1,2
0 200 400 600 800 1000
f cT/f
c2
0°C
Temperature (°C)
Mix1
Mix2
UP polymer concrete
98.7 N/mm2 93,6 N/mm2
9th fib International PhD Symposium in Civil Engineering
Conclusions of the compression strength test
2012.07.24.
• the extent of the strength reduction of polymer concrete does not exceed the strength reduction of concrete of the same strength, up to a heat load of 300°C; • in the case of concrete of a lower strength (Mix1), the extent of strength reduction was higher than in the case of polymer concrete; • BUT: over 300°C the UP polymer concrete started to burn and continued to burn freely until the specimens got carbonized, practically until their strength was considered to be 0 N/mm2
9th fib International PhD Symposium in Civil Engineering
Relative residual flexural strength
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0
0,2
0,4
0,6
0,8
1
1,2
0 200 400 600 800 1000
f flT
/ffl
20°C
Temperature (°C)
Mix1
UP polymer concrete
28,5 N/mm2
17,6 N/mm2
9th fib International PhD Symposium in Civil Engineering
Conclusions of the flexural strength test
2012.07.24.
• the extent of the flexural strength reduction of polymer concrete is higher than the extent of compressive strength reduction; • the extent of the flexural strength reduction of polymer concrete exceeds, up to a head load of 300°C, the strength reduction of concrete.
9th fib International PhD Symposium in Civil Engineering
Modulus of elasticity
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0
10
20
30
40
50
60
70
80
90
100
0 100 200
Fo
rc
e (
kN
)
Displacement (µm)
typical force – displacement curve
9th fib International PhD Symposium in Civil Engineering
The residual values of the modulus of elasticity depend on temperature
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0
0,2
0,4
0,6
0,8
1
1,2
0 100 200 300 400
Ec
T/E
c2
0°C
Temperature (°C)
UP polymer concrete
19446 N/mm2
9861 N/mm2
9th fib International PhD Symposium in Civil Engineering
Summary This study examined the effect of high temperatures on UP polymer concrete. Experiments were conducted to detect the behaviour of UP polymer concrete at 4 different temperatures.
the extent of the strength reduction of polymer concrete does not exceed, up to a heat load of 300°C, the strength reduction of concrete of the same strength;
the tendency of the extent of the flexural strength reduction of polymer concrete and the extent of the modulus of elasticity reduction of polymer concrete are similar, but they show more significant decrease up to a head load of 300°C.
In continue:
The UP polymer concrete had no fire resistance. Our future research will be extended in this direction.
2012.07.24. 9th fib International PhD Symposium in Civil Engineering
A C K N O W L E D G E M E N T S
T H E W O R K R E P O R T E D I N T H E P A P E R H A S B E E N D E V E L O P E D I N T H E F R A M E W O R K O F T H E P R O J E C T „TALENT C A R E A N D C U L T I V A T I O N I N T H E S C I E N T I F I C W O R K S H O P S O F B M E " P R O J E C T . T H I S P R O J E C T I S S U P P O R T E D B Y T H E G R A N T TÁMOP -4 . 2 . 2 . B - 1 0 / 1 - - 2 0 1 0 - 0 0 0 9 .
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Thank you for kind attention!
9th fib International PhD Symposium in Civil Engineering