The cement compressive fixture is a specialized device used to test the strength of cement mortar, in accordance with the Chinese building materials industry standard JC/T683-1977 and the national standard GB/T17671-1999. 

Its core function is to determine the compressive strength of cement, compatible with various pressure testing machines. The standard plate size is 40×40mm, with the upper and lower plates made of hard steel, flatness tolerance ≤0.01mm, and free spacing >45mm. Key parameters include a plate hardness of ≥60HRC and positioning pin hardness of >55HRC. This device is comprised of a lower fixture seat, upper fixture seat, standard clamp roller, and anti-splitting pressure strip, and tests are completed by applying pressure through a press. During calibration, it is necessary to ensure the accuracy of plate dimensions, cleanliness, and that the ball seat is centered. Regular checks for component wear and repairs are needed to extend the service life. Some improved models feature a split design or automatic clamping mechanism to optimize detection accuracy and maintenance convenience through spherical fitting and hydraulic drive.

It mainly consists of a lower fixture base, an upper fixture base, standard pressure rollers, and anti-splitting fixture upper and lower pressing strips. The lower fixture base is fixed to the press piston by a positioning pin and a washer, while the upper fixture base is fixed to the press beam using an upper support, diamond pins, positioning pins on the press, and two internal hexagon screws.

Main specification:

1, The upper and lower pressing plates should be made of hard steel, with a length of 40±0.1mm, a width of 40mm, and a thickness greater than 10mm

2, The planar tolerance of the contact surface between the upper and lower pressing plates and the specimen is 0.01mm, and the free distance of the upper and lower pressing plates is greater than 45mm. 

3, The center of the ball seat on the upper pressing plate should be at the intersection of the center axis of the fixture and the lower surface of the upper pressing plate, with a tolerance of ±1mm, and the upper pressing plate automatically levels itself upon contact with the specimen.

4, sample size: 40*40mm

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