Boekel ASTM 25515016 Cement Menzel Autoclave 350PSI 115V. The Cement Autoclave provides an accelerated means of estimating delayed expansion of Portland cement caused by hydration of CaO, MgO, or both in accordance with procedures described in ASTM C151. In this operation, changes in length of test bars of cement are measured after being exposed to controlled steam pressure and temperature for a prescribed period of time. The Boekel cement autoclave is ASME certified and is the leader in expansion testing apparatus. For more details and pictures please contact us.