The autoclaves provided from Forney, Humboldt and Gilson are virtually the same.
Forney Cement Autoclave LA-4400
Used to estimate the delayed expansion of portland cement caused by hydration of CaO and MgO by exposing test bars to controlled steam pressure and corresponding constant pressure. The unit consists of an electrically heated steam vessel, pressure regulator, 0 to 660 psi (4.13Mpa), pressure gauge, air vent valve, safety pop off valve set at 350 psi (2.4 Mpa).
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Humboldt Cement Autoclave H-3240
Uses accelerated means of estimating delayed expansion of Portland
cement caused by hydration of CaO and MgO. Test bars are exposed
to controlled steam pressure and corresponding constant temperature.
Unit produces 60-350 psi (0.4-2.4MPa) range of pressures and
consists of steam vessel, pressure regulator, pressure gauge (0-600
psi x 5 psi), air vent valve, power switches and safety pop valve set
at 350psi.
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Gilson Cement Autoclave HM-252
The HM-252 Cement Autoclave (Applicable Tests ASTM C 151, AASHTO T107, others) provides an accelerated means of estimating delayed expansion of portland cement caused by hydration of CaO and MgO. Test bars are exposed to controlled steam pressure and constant temperature. The unit is capable of pressures in the 60-350 psi (0.4-2.4 MPa) range and consists of steam vessel, pressure regulator, pressure gage (0-600psi x 5psi), air vent valve, power switches, and a safety pop valve set at 350 psi.
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