Water Retention Test Apparatus for Mortars and Plasters
Water retention equipment evaluates the ability of mortars and plasters to retain water under specified suction conditions. Choose an apparatus and compatible replacement parts for the method used by your laboratory. This is a different measurement from concrete curing, moisture-content testing or grout bleeding.
Start with a Complete Water Retention Apparatus
The listed water retention apparatus uses a vacuum regulator and gauge rather than an older mercury-manometer arrangement. Its description lists an aspirator pump, regulator, gauge, three-way stopcock, flask, gasket, funnel, perforated dish, filter paper and stand.
Check the current supplied-parts list and installation instructions before ordering. Confirm the aspirator's service requirements and the laboratory connections needed for operation; a complete apparatus listing should not be taken to mean every site connection or consumable is supplied.
Match the Funnel, Dish and Gasket
A replacement water retention funnel must fit the apparatus and specimen-support arrangement. Check the mating surfaces and dimensions before combining it with another model's components.
The perforated brass dish supports the test arrangement, while the replacement rubber gasket must match the intended sealing joint. Inspect seals and fittings as directed by the equipment instructions; damaged or mismatched components can affect the suction conditions.
Choose the Correct Stopcock and Filter Paper
Compare the replacement stopcock with the original valve configuration and connection sizes. Use the specified paper rather than assuming any laboratory filter is equivalent. The catalog includes 15cm filter paper for the water retention apparatus, listed in packs of 100. Confirm grade and compatibility for the actual method and instrument before purchase.
Keep Water Retention Separate from Other Mortar Tests
A mortar flow table assesses spread under a prescribed sequence; it does not replace water retention apparatus. Similarly, observing bleed water is not the same as assessing retention under suction. Select each instrument for the property and procedure specified, rather than combining results from different methods.
Confirm Method Documentation Before Testing
Check the current apparatus instructions, relevant test method, vacuum requirements, sample preparation and measurement sequence. Do not use a generic weigh-before-and-after description as an operating procedure. Confirm the complete setup, replacement-part compatibility and consumable quantities before ordering; method-specific acceptance criteria belong in your laboratory procedure.
