Flexural Behavior of Lightweight Concrete Reinforced with ...
Transcript of Flexural Behavior of Lightweight Concrete Reinforced with ...
What is Basalt Rebar? Basalt rock is a volcanic rock deposit
Melted at 1700°C and extruded into thin fibers
Final product is 80% fiber and 20% epoxy bonding agent
History of Basalt Rebar
• Manufactured in the U.S. prior to WWII• Used in Russia during cold war for defense
and aerospace• Declassified for civilian use in the U.S. in
1995• Increasing efforts to commercialize and
lower cost
Overview of Analysis
Analyze the flexural behavior of lightweight concrete reinforced with Basalt Rebar. This task is to be achieved by studying:• Load - Deflection behavior• Concrete strain• Basalt rebar strain• Comparison with steel reinforcement• Comparison of non-linear finite element
analysis
Why Research Basalt Rod Reinforcement? Less than 1/3 the weight of steel Non-corrosive Stronger tensile strength than that of steel Non-reactive Non-conductive
Mix Design Lightweight concrete =120 pcf Concrete Strength at 28 day = 6000 psi
Per 1yd^3
Sand Ne Solite Genevieve Cement
Chicago Slag
Microsilica Cementious Water
1450 935 657.5 100 25 782.5 210.5
Mixture Proportions
Beam Design 2 beams each with reinforcement of…
2 – 8 mm bars Cross sectional area = 100.5 mm2
= 0.16 in2
2 – 10 mm bars Cross sectional area = 157.1 mm2
= 0.24 in2
3 – 8 mm bars Cross sectional area = 150.8 mm2
= 0.23 in2
3 – 10 mm bars Cross sectional area = 235.6 mm2
= 0.37 in2
Length = 12 ft, width = 8 in, depth = 12 in
Testing 4 point flexural test Clear span length 11ft Electrical resistance strain gauges
attached to basalt reinforcement and compressive face of concrete
Linear voltage deflection transducer measured vertical deflection at center of beam
Testing Results Load vs. Deflection Load vs. Reinforcement Strain Load vs. Concrete Compressive Strain