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瑞士一家公司制作一种名叫“Rapidu-nat”的特殊仪器,用这种仪器可以在5小时之内测定出混凝土的28天抗压强度。该仪器的主件是一种蒸压器,在蒸压器上有快速制动门,有抽屉可放试件(3～4只标准圆柱体或立方体)和一只带有电线、仪表的控制器。控制器正面配电板上附有温度控制仪表、一
A Swiss company makes a special instrument called “Rapidu-nat”, which can measure the 28-day compressive strength of concrete within 5 hours. The main part of the instrument is an autoclave with a quick-brake door on the autoclave, a drawer for placing test pieces (3 to 4 standard cylinders or cubes) and a control with wires and instruments. Device. The controller is equipped with a temperature control meter on the front panel.