Humboldt H-3600 Cement Bleeding Apparatus - Manual (Page 2)

1. General
This apparatus is used in the test to determine the bleeding rate
and bleeding capacity of cement paste and mortar by a direct and
continuous procedure.
2. Unpacking
The Cement Bleeding Apparatus, Model H-3600 consists of a container
for the paste or mortar to be tested, a collecting ring and a measuring
burette with funnel.
For shipment, the apparatus is disassembled to avoid breakage
during transit. Care should be taken in unpacking to be sure no
parts are overlooked.
3. Assembly
Prior to the start of the test, the constricted capillary, stopcock and
aspirator should be connected to the top of the burette through a
suitable rubber stopper. The burette assembly should be supported
by a ring stand or similar equipment in order that it can be conveniently
raised and lowered over the collecting ring and held rigidly in place
during the test period.
4. Operating Procedure
4.1 Pastes
Immediately after mixing, carefully pour the paste into the sample
container and take the completion of the screening as the start time for
the test. Take care to make certain that the paste height is level with the
edge of the 5" diameter container.
Place the collecting ring approximately in the center of the paste
surface, embed it to a depth of approximately 1/4" and cover the
surface of the paste with carbon tetrachloride to a depth of I-1/4".
Lower the funnel-burette assembly to within 1/4" of and directly over
the collecting ring. Draw carbon tetrachloride up into the burette by
means of an aspirator to a "zero" burette marking and close the
stopcock. Four minutes after the start time, take the first reading, and
take readings thereafter at 2 minute intervals until 30 minutes after the
start time, and at 10 minutes intervals until cessation of bleeding.
To compensate for density changes as increasing quantities of water
gather in the measuring burette, zero the meniscus every 10 minutes
immediately before the appropriate reading for each period.