• Rapid, Freeze-Thaw Cabinet

Rapid, Freeze-Thaw Cabinet


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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.

  • Set temperature min/max for cycles
  • Select number of cycles
  • LCD temperature display
  • Analog temperature vs. time graph

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. The cabinet includes 17 Standard, H-3185T sample trays and 1 Standard, H-3185TS sample tray, which has a built-in spout on each end of the tray. Key features of system include:

  • Fully automatic operation frees operator to perform other lab duties.
  • Allows users to establish field control using correlations between concrete strength and durability
  • Permits the evaluation of variables in concrete properties and conditioning.
  • Useful in the evaluation of the durability of aggregates, as well as the properties of ad mixtures.

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.

Order H-3195 freeze-thaw molds separately. Shipping wt. 950 lbs. (431kg); 29 cu. ft.




Thermocouple Replacement for H-3185B
H-3195Freeze-Thaw Specimen Mold
H-3198MFreeze-Thaw Specimen Mold for 100 x 100 x 400mm Specimens
H-3185TStainless Steel Sample Positioning Tray - Stainless Steel Sample Positioning Tray
H-3185TMStainless Steel Sample Positioning Tray - Stainless Steel Sample Tray
H-3185TSStainless Steel Sample Positioning Tray with Spout
H-3185.17-Day Chart Paper - 7-Day Chart Paper (100/Bx),-20 to +80°F
H-3185.1AC7-Day Chart Paper - 7-Day Chart Paper (60/Bx),-30 to +10°C
H-3185.1AF7-Day Chart Paper - 7-Day Chart Paper (60/Bx),-20 to +50°F


Replacement Part
H-3185SHReplacement Heating Element
H-3185.3APen Replacement Kit, (1) per kit