This standard delineates precise construction and material requirements for flow tables used in assessing the flow and consistency of hydraulic cement and pozzolanic mortars. It details design parameters, material grades, performance benchmarks, and essential accessories to guarantee accurate and reproducible test outcomes. It is indispensable for flow table manufacturers and laboratories engaged in cement material evaluations.
Overview
This standard delineates precise construction and material requirements for flow tables used in assessing the flow and consistency of hydraulic cement and pozzolanic mortars. It details design parameters, material grades, performance benchmarks, and essential accessories to guarantee accurate and reproducible test outcomes. It is indispensable for flow table manufacturers and laboratories engaged in cement material evaluations.
Audience
Contents
Structure
This section defines the application scope, specifying materials and dimensional requirements for flow table parts. Dimensions are aligned with a reference figure and tolerances follow a designated standard. Procedures for rounding test results are also outlined.
Details the recommended materials for each component of the flow table, including hardness and grade requirements, supported by relevant Indian Standards for metals and alloys used in the apparatus.
Covers exact measurements, tolerances, and construction highlights such as frame rigidity, table top design, and cam mechanism attributes essential for reliable operation.
Describes methods for assembling the flow table and securing it to a base frame or pedestal, ensuring correct orientation, stability, and precise vertical drop control.
Defines accuracy requirements for flow value measurements during calibration, establishing acceptable deviation limits to maintain consistency and reliability.
Specifies lubrication practices for moving parts such as the cam and vertical shaft, emphasizing the importance of proper lubrication to reduce wear and sustain smooth operation.
Outlines mandatory and optional markings on flow table components, including manufacturer identification, manufacturing date, and certification marks to ensure traceability and compliance.
Lists additional parts and accessories such as moulds, calipers, and protective shields, with their material requirements and functional roles in the testing setup.
Details the calibration process, including acceptance criteria for flow values and the use of standard calibration materials to verify apparatus accuracy.
Describes manual and motor-driven operating methods, including speed, power requirements, and mechanical components like cams and shafts, with focus on smooth, precise motion.
Provides instructions for routine maintenance, inspection of component hardness, lubrication schedules, and calibration verification to ensure continued performance.
Frequently Asked
Per the standard’s clause and associated table, components of the flow table must be made from specific materials to ensure durability and precision. The table and mould are to be cast brass with a minimum hardness of 25 HRB (220 HV). The supporting frame should be cast iron of grade 20 or higher, while the cam and vertical shaft require case-hardened mild steel with hardness between 50-55 HRC (510-600 HV). The cam shaft is made from mild steel, and the base plate can be either cast iron or steel, adhering to corresponding Indian Standards.
The flow table assembly is fixed to a cast iron or steel plate at least 25 mm thick and measuring 250 mm square, with a machined flat top surface. This plate is anchored to a concrete pedestal weighing at least 200 kg using four 12 mm diameter bolts embedded a minimum of 150 mm into the pedestal. Cork pads approximately 12 mm thick and 100 mm square are placed under each pedestal corner for stability, with leveling carried out beneath the pedestal. No nuts or leveling devices are used between the plate and pedestal to ensure firm contact and rigidity.
The flow table must demonstrate flow values during calibration tests that do not deviate by more than ±5% from those obtained using a standard calibration material. This ensures the apparatus provides accurate and repeatable measurements of mortar consistency. Additionally, dimensional tolerances for the table diameter and vertical drop height are specified to maintain test integrity.
Motorized drive options and drop counting devices are not mandatory under this standard. The flow table may be operated manually via a hand wheel on the cam shaft or optionally with a motorized system that includes a worm gear speed reducer. Drop counters and automatic motor shut-off switches are optional and provided only upon purchaser request, allowing customization based on user requirements.
The clearance between the vertical shaft diameter and the frame bore should be between 0.05 mm to 0.075 mm for new tables, extending up to 0.125 mm for tables in use. The cam face features a smooth spiral curve with a radius incrementing uniformly from 12 mm to 30 mm over 360 degrees. Both cam tip and vertical shaft surfaces are required to be case-hardened to a depth of approximately 6 mm, achieving hardness levels between 50-55 HRC (510-600 HV). The shaft must maintain contact with the cam at least 120 degrees away from the drop point, and the apparatus design restricts the rotation to no more than one revolution per 25 drops to ensure consistent operation.
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