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Concrete, Cement, brick, ceramic tiles Compression test fixture

Concrete, Cement, brick, ceramic tiles Compression test fixture

ISO 679

Cement, brick, ceramic tiles compression test fixture is an industrial product used to test the compressive strength of cement mortar, brick, ceramatic products. 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.

General introduction

Cement, brick, ceramic tiles compression test fixture is an industrial product used to test the compressive strength of cement mortar, brick, ceramatic products. 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/T 17671-1999. 

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.

Concrete, Cement, brick, ceramic tiles Compression test fixture

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.

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

Standard

ISO 679 cement compressive and flexural strength test method –

ISO 679 determining the compressive strength (and optionally flexural strength) of cement, using a standardized mortar mix rather than testing pure cement paste or concrete. It is the benchmark that allows different cements from different plants and countries to be compared on a level playing field.

ASTM C109 Compression Testing of Cement Mortar –

ASTM C109 is the fundamental test method for determining the compressive strength of hydraulic cement using 2-inch (50-mm) mortar cubes. It specifies a standardized procedure to prepare, cure, and test 50-mm (2-in.) cube mortar specimens for compressive strength. The mortar mix ratio is 1 part cement to 2.75 parts standard sand (by mass). For Portland/air-entraining Portland/Portland-limestone cements, water content is fixed; for other cements, water is adjusted to achieve a flow of 110±5 (per 25 drops on a flow table, ASTM C230). Specimens are compacted in two layers by tamping, cured, and loaded in compression until failure to calculate strength as peak load divided by cross-sectional area.

ASTM C349 Cement Mortar Compressive Strength Testing –

ASTM C349 Standard Test Method for Compressive Strength of Hydraulic‑Cement Mortars (Using Portions of Prisms Broken in Flexure)

ASTM C349 determines mortar compressive strength from broken fragments of 40 × 40 × 160 mm prisms that have already undergone flexural testing per ASTM C348. This test yields reference‑only compressive results and shall not replace ASTM C109/C109M for official cement acceptance testing. Instead of casting separate cube specimens for compression, this method re‑uses the two broken pieces from each mortar prism fractured in the C348 flexure test. These broken prism segments act as “modified cubes” for compressive loading. The test transforms flexural‑test remnants into compression specimens, enabling acquisition of both flexural and compressive strength data from one set of prisms.

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