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The Rapid Freeze-Thaw Cabinet is used to measure the resistance of concrete to deterioration caused by repeated cycles of freezing and thawing in water. The system is designed to test up to eighteen 3" x 4" x 16" (76 x 102 x 406cm) concrete specimens simultaneously, with one being a control. Key features of system include:
Up to eight freeze-thaw cycles are possible within a 24-hour period. But the exact number of cycles is dependent upon the time required for the temperature at the center of the control prism to from 40 to 0°F (4.4 to -17.8°C) and then back to 40°F (4.4°C). The temperature at the center of the control specimen is cycled by means of a 3/4 HP (0.6KW) refrigeration unit and electric resistance heaters with fully automatic controls. An electric temperature recorder with 24-hour, 7-day week chart is incorporated into the unit to accurately maintain a record of the control specimen temperature throughout the testing period. For corrosion resistance and long service life, the system features a stainless steel, 84" x 34" x 11" (213 x 86 x 30cm) cabinet construction with 3" (76mm) insulation on all sides. The internal test compartment measures 6" x 26" x 74" (15 x 66 x 188cm). A 30-amp circuit is required for operation. Meets ASTM C666, procedure A; and AASHTO T161, procedure A.
The H-3185B uses on/off control of heating and cooling devices to cycle between two temperatures. It can be set to cycle continuously between two temperatures for a finite number of cycles and then stop. When set to run for a finite number of cycles, ramp rate between temperature extremes can be adjusted, as well as soak duration at each extreme.
The H-3185SD goes beyond the basic capabilities of the B model above and provides the following capabilities:
The E-Meter can determine flexural resonance of concrete under accelerated freezing and thawing cycles and aggressive environments, conforming to ASTM C-215 and C-666. It determines the resonant frequencies of the three modes of vibration and is the only method of calculating the following material parameters non destructively: such as Youngs Modulus of Elasticity, Modulus of Rigidity, Poissons Ratio and Damping Constant.
The Sonometer determines changes in resonant frequency of concrete specimens subjected to alternate cycles of freezing and thawing with the Humboldt Freeze-Thaw Cabinet. This apparatus closely follows design parameters set up by the Portland Cement Association research laboratories. No other resonant frequency system includes an oscilloscope despite being strongly recommended in ASTM C215
For 3 x 4 x 16" (76 x 102 x 406mm) specimens exposed to rapidly repeated freeze-thaw cycles in water or air. Mold is cold-rolled steel with detachable base plate. Meets ASTM C233, C666; AASHTO T157, T161.