This guideline details the specifications for vibration machines designed to prepare standard 70.6 mm cement mortar cubes, which are crucial for assessing the compressive strength of hydraulic cement. It includes requirements for the machine's design, materials, dimensions, and operational parameters to guarantee reliable and uniform test outcomes in cement and concrete laboratories.
Overview
This guideline details the specifications for vibration machines designed to prepare standard 70.6 mm cement mortar cubes, which are crucial for assessing the compressive strength of hydraulic cement. It includes requirements for the machine's design, materials, dimensions, and operational parameters to guarantee reliable and uniform test outcomes in cement and concrete laboratories.
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The cement mortar cube mould must have a cube size of 70.6 mm with a tolerance of ±0.1 mm for both the distance between opposite faces and height. The wall thickness should be 12 mm, while the base plate measures 97 mm by 97 mm with a thickness of 6 mm. The interior face angles are to be maintained at 90° ± 0.5°. Flatness tolerances are 0.03 mm for new moulds and 0.05 mm for moulds in use, with the base plate flatness tolerance set at 0.15 mm. The mould assembly, including the base plate, should weigh approximately 2.8 ± 0.2 kg. Two-part construction is required for ease of separation, adhering to the applicable IS 10086-1982 standard.
Materials prescribed include ISLC 200 steel channel for the bed frame equipped with cast iron feet and leveling screws. The vibrator and drive pulley must be made from cast iron with a smooth finish conforming to IS 210-1978. The eccentric shaft and pulleys are to be of mild steel as per IS 226-1975. Springs used for support and tension are made from spring steel. The belt connecting motor and vibrator should be an endless woven cotton/nylon type rated for 3/4 horsepower at 2800 rpm. The mould can be fabricated from cast iron or mild steel according to the relevant IS specifications.
The vibration machine requires the vibrator assembly mounted on springs to have a mass of 29 ± 0.5 kg, excluding the solid eccentric and cube hut but including mould, clamp, and hopper. The eccentric shaft must have an out-of-balance moment of 0.0016 kg·m and operate at a speed of 12,000 ± 400 rpm. The driving motor should provide 3/4 horsepower at 2800 rpm, transmitting power via an endless belt drive.
The vibrator is supported on four coiled springs to isolate vibrations effectively. It contains a rotating shaft with a precisely machined eccentric mass. This shaft is connected to a pulley driven by an endless belt from the motor shaft. The entire assembly, including springs and vibrator, is installed on a steel channel bed frame, ensuring stable support and effective vibration transmission.
Each component of the vibration machine and its accessories must bear clear and permanent markings indicating the manufacturer's name or registered trademark and the date of manufacture. These markings must not interfere with the machine's operational performance. The standard also allows for the optional application of the BIS Standard Mark, provided the manufacturer has obtained the appropriate license.
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